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Seyed Reza Shadizadeh - One of the best experts on this subject based on the ideXlab platform.

  • colloidal gas aphron Drilling Fluid properties generated by natural surfactants experimental investigation
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Mohammad Ali Ahmadi, Morteza Galedarzadeh, Seyed Reza Shadizadeh
    Abstract:

    Abstract Colloidal gas aphron (CGA) Fluids are special types of Fluids containing micro-bubbles with sizes between 10 and 100 microns which are created by mixing an aphronizer surfactant in a polymeric solution at high speed. Recently, CGA Fluids have been successfully employed as Drilling Fluid in petroleum upstream. CGA Based Drilling Fluid properties like stability and aphron size distribution highly depends on the characteristics of an aphronizer surfactant. As a result, selection of an appropriate surface active agent plays a vital role for generating micro-bubbles with the favorable properties. The main objective of the present paper is to evaluate the potential of new natural surfactants as aphronizer in CGA-Based Drilling Fluids. In this regard, two new natural surfactants which derived from roots of Seidlitzia Rosmarinus and leaves of Henna plant are employed for preparing aphron-Based Fluids. Physico-chemical properties of the aphronized Fluids prepared from these surfactants were investigated by various standard experiments including bubble size measurements, rheological characterizations and stability tests. Moreover, the effects of polymer and surfactant concentrations were studied systematically. Based on the experimental results obtained from this work, the two aforementioned natural surfactants are appropriate for generating CGA Based Drilling Fluid while they have no environmental impacts, and have very low cost in comparison with commercial and industrial surfactants.

Hanyi Zhong - One of the best experts on this subject based on the ideXlab platform.

  • minimizing the hthp filtration loss of oil Based Drilling Fluid with swellable polymer microspheres
    Journal of Petroleum Science and Engineering, 2019
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Yongxue Lin, Guangcheng Shen, Lijun Fan, Xiaodong Xing
    Abstract:

    Abstract Filtration control of Drilling Fluid plays an important role in the process of wellbore construction and ensures the success of Drilling operation. A swellable polymer microsphere (SPM) of methylmethacrylate (MMA), butyl acrylate (BA), and lauryl methacrylate (LMA) was synthesized with suspension polymerization. Its swelling property was characterized by oil adsorption capacity measurement. First, the effect of SPM on the filtration and rheological properties of virgin organic clay dispersion was investigated. Then the filtration and rheological properties of mineral oil-Based Drilling Fluid in the presence of SPM were elucidated under the respective conditions of hot aging temperature, oil to water ratio and density. Furthermore, the filtration control properties between SPM and two traditional filtration loss additives including modified lignite and asphaltic additive was compared. Addition of SPM exhibited obvious influence on the viscosity of oil-Based Drilling Fluid especially at high concentration of 3 w/v%, therefore, a concentration of lower than 1.5 w/v% was recommended. After hot aging at 200 °C, the oil-Based Drilling Fluid containing 1 w/v% SPM exhibited an API filtration loss decrease of 85%, and HTHP filtration loss decrease of 79% in comparison with the base Fluid. After hot rolling at 180 °C, the API filtration loss decreased by 2%, 24% and 53%, and the HTHP filtration loss decreased by 42%, 54% and 65% respectively when 1 w/v% asphaltic additive, modified lignite and SPM are in the presence of the base Fluid. Besides decreasing the filtration loss volume under high temperatures, incorporation of SPM also improves the filter cake quality of oil-Based Drilling Fluid. SPM is capable of adsorbing considerable base oil and become swellable. The swellable polymer microspheres with favorably deformable and compressible properties can effectively fill the voids of filter cake and reduce the permeability, which leads to low filtration loss and minimization of solids invasion.

  • synergistic stabilization of shale by a mixture of polyamidoamine dendrimers modified bentonite with various generations in water Based Drilling Fluid
    Applied Clay Science, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Weian Huang, Dong Sun, Daoming Zhang, Jie Cao
    Abstract:

    Abstract The amine terminated polyamidoamine (PAMAM) dendrimers were investigated as potential shale stabilizers for the first time. Its inhibitive properties were characterized by a bentonite inhibition test and a shale cuttings dispersion test. The interaction between PAMAM dendrimers of various generations and sodium bentonite was examined by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The hydration and dispersion of shale can be effectively inhibited with PAMAM dendrimers. The decrease of pH value in the dendrimer aqueous solution improved the inhibitive performance. For lower generations of dendrimer growth (G0 to G3), the inhibitive level decreased with the increase of generation. For higher generations (G4, G5), the inhibitive level increased with the increase of generation. Low generation PAMAM dendrimers could penetrate into the clay interlayer space, but exhibited highly oblate intercalation behaviors. G0 intercalated into the interlayer space with a monolayer conformation as concentration increased, while G1, G2, G3 and G4 intercalated into the interlayer space with monolayer arrangement at low concentrations, and mixed phase orientation at high concentrations. G5 could not fully intercalate into the interlayer space due to the steric hindrance. According to the interaction between PAMAM and clay, effective internal and external inhibition on shale hydration and dispersion could be obtained with the combination of low generation G0 and high generation G5. A new water-Based Drilling Fluid including G0 as shale swelling inhibitor and G5 as shale dispersion inhibitor was established and exhibited excellent inhibitive properties.

  • inhibitive properties comparison of different polyetheramines in water Based Drilling Fluid
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Dong Sun, Daoming Zhang, Weian Huang
    Abstract:

    Abstract Polyetheramines as shale hydration inhibitors in water-Based Drilling Fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD, contact angle measurement, and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight, number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.

  • novel hydrophobic associated polymer Based nano silica composite with core shell structure for intelligent Drilling Fluid under ultra high temperature and ultra high pressure
    Progress in Natural Science: Materials International, 2015
    Co-Authors: Hui Mao, Zhengsong Qiu, Weian Huang, Hanyi Zhong, Zhonghou Shen, Wenhao Dai
    Abstract:

    Abstract Micro-nano-Based Drilling Fluid has attracted a strong interest due to its attractive properties, and micro-nano composite materials have great potential for developing intelligent Drilling Fluid. In this study a novel hydrophobic associated polymer Based nano-silica composite with core–shell structure was prepared and characterized by PSD, SEM, TEM and ESEM. The results showed that the composite, as a micro-nano Drilling Fluid additive, possessed excellent properties such as thermal stability, rheology, Fluid loss and lubricity. Especially, it could plug the formation effectively and improve the pressure bearing capability of formation significantly.

  • Bis(hexamethylene)triamine as Potential Shale Inhibitor in Water-Based Drilling Fluid
    The Open Petroleum Engineering Journal, 2013
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Weian Huang, Binqiang Xie, Wang Weiji
    Abstract:

    Based on the rules of designing high performance shale inhibitors, bis(hexamethylene)triamine was introduced as a potential shale inhibitor in water-Based Drilling Fluid. The inhibitive properties were evaluated through bentonite inhibition test, cuttings hot-rolling dispersion test and particle distribution measurement. The compatibility with common Drilling Fluid additives was investigated. Bis(hexamethylene)triamine effectively inhibited shale swelling and dispersion, superior to potassium chloride and polyetherdiamine POP230, and was compatible with normal additives in Drilling Fluid. The inhibitive mechanism was analyzed via XRD, zeta potential measurement, FT-IR, water adsorption test and TGA. The results showed that electrostatic interaction, hydrogen bonding and hydrophobic shielding effect contributed to the inhibition with synergetic effects, whereas the protonation of multi-amine groups played a vital role in the action.

Zhengsong Qiu - One of the best experts on this subject based on the ideXlab platform.

  • Inhibitory effect of water-Based Drilling Fluid on methane hydrate dissociation
    Chemical Engineering Science, 2019
    Co-Authors: Xin Zhao, Zhengsong Qiu, Chao Zhao, Yubin Zhang
    Abstract:

    Abstract Hydrate dissociation poses a significant problem during Drilling operations in hydrate-bearing sediments. The Drilling Fluid is in direct contact with hydrates, and understanding its inhibitory effect on hydrate dissociation is important for stabilizing hydrates during Drilling operations. In this work, an apparatus was designed for investigating hydrate dissociation in Drilling Fluids, and the effects of thermodynamic hydrate inhibitors (THIs), polyvinyl pyrrolidone (PVP), and soybean lecithin on hydrate dissociation were studied. The inhibitory effect of a water-Based Drilling Fluid in the presence of the potential hydrate dissociation inhibitors was also studied. An unexpected inhibitory effect occurred with ethylene glycol (EG) at concentrations below 10 wt%, resulting from a range of factors including the dissociation driving force, and mass and heat transfers in the EG solution. PVP and lecithin reduced the hydrate dissociation rate and increased the time required for complete dissociation of hydrates. These can, therefore, be used in water-Based Drilling Fluids to inhibit hydrate dissociation. A combination of 0.1 wt% PVP and 0.5 wt% lecithin was selected as an optimal hydrate dissociation inhibitor, considering its inhibitory effect and compatibility with the Drilling Fluid. Using EG at a concentration below 10 wt% as a THI instead of NaCl can also help inhibit hydrate dissociation. The findings of this work provide a basis for the development and design of Drilling Fluids for Drilling in hydrate-bearing sediments.

  • minimizing the hthp filtration loss of oil Based Drilling Fluid with swellable polymer microspheres
    Journal of Petroleum Science and Engineering, 2019
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Yongxue Lin, Guangcheng Shen, Lijun Fan, Xiaodong Xing
    Abstract:

    Abstract Filtration control of Drilling Fluid plays an important role in the process of wellbore construction and ensures the success of Drilling operation. A swellable polymer microsphere (SPM) of methylmethacrylate (MMA), butyl acrylate (BA), and lauryl methacrylate (LMA) was synthesized with suspension polymerization. Its swelling property was characterized by oil adsorption capacity measurement. First, the effect of SPM on the filtration and rheological properties of virgin organic clay dispersion was investigated. Then the filtration and rheological properties of mineral oil-Based Drilling Fluid in the presence of SPM were elucidated under the respective conditions of hot aging temperature, oil to water ratio and density. Furthermore, the filtration control properties between SPM and two traditional filtration loss additives including modified lignite and asphaltic additive was compared. Addition of SPM exhibited obvious influence on the viscosity of oil-Based Drilling Fluid especially at high concentration of 3 w/v%, therefore, a concentration of lower than 1.5 w/v% was recommended. After hot aging at 200 °C, the oil-Based Drilling Fluid containing 1 w/v% SPM exhibited an API filtration loss decrease of 85%, and HTHP filtration loss decrease of 79% in comparison with the base Fluid. After hot rolling at 180 °C, the API filtration loss decreased by 2%, 24% and 53%, and the HTHP filtration loss decreased by 42%, 54% and 65% respectively when 1 w/v% asphaltic additive, modified lignite and SPM are in the presence of the base Fluid. Besides decreasing the filtration loss volume under high temperatures, incorporation of SPM also improves the filter cake quality of oil-Based Drilling Fluid. SPM is capable of adsorbing considerable base oil and become swellable. The swellable polymer microspheres with favorably deformable and compressible properties can effectively fill the voids of filter cake and reduce the permeability, which leads to low filtration loss and minimization of solids invasion.

  • synergistic stabilization of shale by a mixture of polyamidoamine dendrimers modified bentonite with various generations in water Based Drilling Fluid
    Applied Clay Science, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Weian Huang, Dong Sun, Daoming Zhang, Jie Cao
    Abstract:

    Abstract The amine terminated polyamidoamine (PAMAM) dendrimers were investigated as potential shale stabilizers for the first time. Its inhibitive properties were characterized by a bentonite inhibition test and a shale cuttings dispersion test. The interaction between PAMAM dendrimers of various generations and sodium bentonite was examined by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The hydration and dispersion of shale can be effectively inhibited with PAMAM dendrimers. The decrease of pH value in the dendrimer aqueous solution improved the inhibitive performance. For lower generations of dendrimer growth (G0 to G3), the inhibitive level decreased with the increase of generation. For higher generations (G4, G5), the inhibitive level increased with the increase of generation. Low generation PAMAM dendrimers could penetrate into the clay interlayer space, but exhibited highly oblate intercalation behaviors. G0 intercalated into the interlayer space with a monolayer conformation as concentration increased, while G1, G2, G3 and G4 intercalated into the interlayer space with monolayer arrangement at low concentrations, and mixed phase orientation at high concentrations. G5 could not fully intercalate into the interlayer space due to the steric hindrance. According to the interaction between PAMAM and clay, effective internal and external inhibition on shale hydration and dispersion could be obtained with the combination of low generation G0 and high generation G5. A new water-Based Drilling Fluid including G0 as shale swelling inhibitor and G5 as shale dispersion inhibitor was established and exhibited excellent inhibitive properties.

  • inhibitive properties comparison of different polyetheramines in water Based Drilling Fluid
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Dong Sun, Daoming Zhang, Weian Huang
    Abstract:

    Abstract Polyetheramines as shale hydration inhibitors in water-Based Drilling Fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD, contact angle measurement, and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight, number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.

  • novel hydrophobic associated polymer Based nano silica composite with core shell structure for intelligent Drilling Fluid under ultra high temperature and ultra high pressure
    Progress in Natural Science: Materials International, 2015
    Co-Authors: Hui Mao, Zhengsong Qiu, Weian Huang, Hanyi Zhong, Zhonghou Shen, Wenhao Dai
    Abstract:

    Abstract Micro-nano-Based Drilling Fluid has attracted a strong interest due to its attractive properties, and micro-nano composite materials have great potential for developing intelligent Drilling Fluid. In this study a novel hydrophobic associated polymer Based nano-silica composite with core–shell structure was prepared and characterized by PSD, SEM, TEM and ESEM. The results showed that the composite, as a micro-nano Drilling Fluid additive, possessed excellent properties such as thermal stability, rheology, Fluid loss and lubricity. Especially, it could plug the formation effectively and improve the pressure bearing capability of formation significantly.

Weian Huang - One of the best experts on this subject based on the ideXlab platform.

  • synergistic stabilization of shale by a mixture of polyamidoamine dendrimers modified bentonite with various generations in water Based Drilling Fluid
    Applied Clay Science, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Weian Huang, Dong Sun, Daoming Zhang, Jie Cao
    Abstract:

    Abstract The amine terminated polyamidoamine (PAMAM) dendrimers were investigated as potential shale stabilizers for the first time. Its inhibitive properties were characterized by a bentonite inhibition test and a shale cuttings dispersion test. The interaction between PAMAM dendrimers of various generations and sodium bentonite was examined by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The hydration and dispersion of shale can be effectively inhibited with PAMAM dendrimers. The decrease of pH value in the dendrimer aqueous solution improved the inhibitive performance. For lower generations of dendrimer growth (G0 to G3), the inhibitive level decreased with the increase of generation. For higher generations (G4, G5), the inhibitive level increased with the increase of generation. Low generation PAMAM dendrimers could penetrate into the clay interlayer space, but exhibited highly oblate intercalation behaviors. G0 intercalated into the interlayer space with a monolayer conformation as concentration increased, while G1, G2, G3 and G4 intercalated into the interlayer space with monolayer arrangement at low concentrations, and mixed phase orientation at high concentrations. G5 could not fully intercalate into the interlayer space due to the steric hindrance. According to the interaction between PAMAM and clay, effective internal and external inhibition on shale hydration and dispersion could be obtained with the combination of low generation G0 and high generation G5. A new water-Based Drilling Fluid including G0 as shale swelling inhibitor and G5 as shale dispersion inhibitor was established and exhibited excellent inhibitive properties.

  • inhibitive properties comparison of different polyetheramines in water Based Drilling Fluid
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Dong Sun, Daoming Zhang, Weian Huang
    Abstract:

    Abstract Polyetheramines as shale hydration inhibitors in water-Based Drilling Fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD, contact angle measurement, and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight, number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.

  • novel hydrophobic associated polymer Based nano silica composite with core shell structure for intelligent Drilling Fluid under ultra high temperature and ultra high pressure
    Progress in Natural Science: Materials International, 2015
    Co-Authors: Hui Mao, Zhengsong Qiu, Weian Huang, Hanyi Zhong, Zhonghou Shen, Wenhao Dai
    Abstract:

    Abstract Micro-nano-Based Drilling Fluid has attracted a strong interest due to its attractive properties, and micro-nano composite materials have great potential for developing intelligent Drilling Fluid. In this study a novel hydrophobic associated polymer Based nano-silica composite with core–shell structure was prepared and characterized by PSD, SEM, TEM and ESEM. The results showed that the composite, as a micro-nano Drilling Fluid additive, possessed excellent properties such as thermal stability, rheology, Fluid loss and lubricity. Especially, it could plug the formation effectively and improve the pressure bearing capability of formation significantly.

  • Bis(hexamethylene)triamine as Potential Shale Inhibitor in Water-Based Drilling Fluid
    The Open Petroleum Engineering Journal, 2013
    Co-Authors: Hanyi Zhong, Zhengsong Qiu, Weian Huang, Binqiang Xie, Wang Weiji
    Abstract:

    Based on the rules of designing high performance shale inhibitors, bis(hexamethylene)triamine was introduced as a potential shale inhibitor in water-Based Drilling Fluid. The inhibitive properties were evaluated through bentonite inhibition test, cuttings hot-rolling dispersion test and particle distribution measurement. The compatibility with common Drilling Fluid additives was investigated. Bis(hexamethylene)triamine effectively inhibited shale swelling and dispersion, superior to potassium chloride and polyetherdiamine POP230, and was compatible with normal additives in Drilling Fluid. The inhibitive mechanism was analyzed via XRD, zeta potential measurement, FT-IR, water adsorption test and TGA. The results showed that electrostatic interaction, hydrogen bonding and hydrophobic shielding effect contributed to the inhibition with synergetic effects, whereas the protonation of multi-amine groups played a vital role in the action.

  • shale inhibitive properties of polyether diamine in water Based Drilling Fluid
    Journal of Petroleum Science and Engineering, 2011
    Co-Authors: Hanyi Zhong, Weian Huang
    Abstract:

    Abstract In this paper, the shale hydration inhibitive properties of polyether diamine (PEDA) in Drilling Fluid system were studied. The inhibition was evaluated by bentonite inhibition test and bulk hardness test. The results indicate that the inhibition properties of PEDA are superior to potassium chloride which is a kind of conventional inhibitor, and can be improved with decrease of pH value. The inhibition mechanism of PEDA was investigated via Fourier transform infrared spectroscopy, X-ray diffraction, zeta potential measurement and surface tension analysis. After being added into the Drilling Fluid system, the low-molecular-weight PEDA can intercalate into the lattice of clay. The protonated diammonium ions exchange sodium ions and neutralize the negative charges of clay interlayer, which reduces hydration repulsion of diffuse electric double layer. Moreover, hydrogen bonding between PEDA and silica of clay surface can form in the process. The coordination of electrostatic interaction and hydrogen bonding expels water molecules out of the clay gallery and binds the plates together, which leads to the dehydration of clay. Otherwise, monolayer adsorption of PEDA on the interlayer of clay weakens the hydrophilicity of clay particles which further inhibits water ingress.

Jihua Cai - One of the best experts on this subject based on the ideXlab platform.

  • design and evaluation of a surfactant mixed metal hydroxide Based Drilling Fluid for maintaining wellbore stability in coal measure strata
    Energies, 2019
    Co-Authors: Shuya Chen, Yanping Shi, Xianyu Yang, Kunzhi Xie, Jihua Cai
    Abstract:

    Co-exploitation of coal measure gases (coalbed gas, shale gas, and tight sandstone gas) puts a higher requirement on Drilling Fluids. Conventional Drilling Fluids have disadvantages, such as causing problems of borehole collapse, formation damage, and water blockage. This paper proposes a set of high inhibitive and low-damage Drilling Fluids that function by electrical inhibition and neutral wetting. Zeta potential results showed that the negative electrical property of Longtan coal in Bijie, Guizhou, can be reversed by organic mixed metal hydroxide (MMH) and the cationic surfactant alkyl trimethylammonium bromide (CS-5) from −3.63 mV to 19.75 mV and 47.25 mV, respectively. Based on the contact angle and Fourier Transform Infrared Spectroscopy (FT-IR) results, it can be concluded that chemical adsorption dominates between the Longmaxi shale and surfactants, and physical adsorption between the Longtan coal and surfactants. A compound surfactant formula (0.001 wt% CS-4 + 0.001 wt% CS-1 + 0.001 wt% CS-3), which could balance the wettability of the Longmaxi shale and the Longtan coal, making them both appear weakly hydrophilic simultaneously, was optimized. After being treated by the compound surfactants, the contact angles of the Longmaxi shale and the Longtan coal were 89° and 86°, respectively. Pressure transmission tests showed that the optimized combination of compound surfactants and inorganic MMH (MMH-1) could effectively reduce permeability of the Longmaxi shale and the Longtan coal, thus retarding pore pressure transmission in coal measure strata. Then, the proposed water-Based Drilling Fluid (WBDF) system (4 wt% sodium bentonite + 1.5 wt% sodium carboxymethyl cellulose + 2 wt% lignite resin + 5 wt% potassium chloride + 3 wt%MMH-1 + 0.001 wt% CS-4 + 0.001 wt% CS-1 + 0.001 wt% CS-3) was evaluated Based on parameters including rheology, American Petroleum Institute (API) filtration, electrical property, wettability, inhibition capability, reservoir protection characteristics, and anti-pollution performance. It had an API filtration of 7 mL, reservoir damage rate of 10%, moderate and acceptable viscosity, strong inhibition capability to coal measure strata rocks, good tolerance to inorganic pollutants and Drilling cuttings, and environmentally friendly properties. It could meet wellbore stability and reservoir protection requirements in the co-exploitation of coal measure gases.

  • Design and Evaluation of a Surfactant–Mixed Metal Hydroxide-Based Drilling Fluid for Maintaining Wellbore Stability in Coal Measure Strata
    MDPI AG, 2019
    Co-Authors: Shuya Chen, Yanping Shi, Xianyu Yang, Kunzhi Xie, Jihua Cai
    Abstract:

    Co-exploitation of coal measure gases (coalbed gas, shale gas, and tight sandstone gas) puts a higher requirement on Drilling Fluids. Conventional Drilling Fluids have disadvantages, such as causing problems of borehole collapse, formation damage, and water blockage. This paper proposes a set of high inhibitive and low-damage Drilling Fluids that function by electrical inhibition and neutral wetting. Zeta potential results showed that the negative electrical property of Longtan coal in Bijie, Guizhou, can be reversed by organic mixed metal hydroxide (MMH) and the cationic surfactant alkyl trimethylammonium bromide (CS-5) from −3.63 mV to 19.75 mV and 47.25 mV, respectively. Based on the contact angle and Fourier Transform Infrared Spectroscopy (FT-IR) results, it can be concluded that chemical adsorption dominates between the Longmaxi shale and surfactants, and physical adsorption between the Longtan coal and surfactants. A compound surfactant formula (0.001 wt% CS-4 + 0.001 wt% CS-1 + 0.001 wt% CS-3), which could balance the wettability of the Longmaxi shale and the Longtan coal, making them both appear weakly hydrophilic simultaneously, was optimized. After being treated by the compound surfactants, the contact angles of the Longmaxi shale and the Longtan coal were 89° and 86°, respectively. Pressure transmission tests showed that the optimized combination of compound surfactants and inorganic MMH (MMH-1) could effectively reduce permeability of the Longmaxi shale and the Longtan coal, thus retarding pore pressure transmission in coal measure strata. Then, the proposed water-Based Drilling Fluid (WBDF) system (4 wt% sodium bentonite + 1.5 wt% sodium carboxymethyl cellulose + 2 wt% lignite resin + 5 wt% potassium chloride + 3 wt%MMH-1 + 0.001 wt% CS-4 + 0.001 wt% CS-1 + 0.001 wt% CS-3) was evaluated Based on parameters including rheology, American Petroleum Institute (API) filtration, electrical property, wettability, inhibition capability, reservoir protection characteristics, and anti-pollution performance. It had an API filtration of 7 mL, reservoir damage rate of 10%, moderate and acceptable viscosity, strong inhibition capability to coal measure strata rocks, good tolerance to inorganic pollutants and Drilling cuttings, and environmentally friendly properties. It could meet wellbore stability and reservoir protection requirements in the co-exploitation of coal measure gases