The Experts below are selected from a list of 68910 Experts worldwide ranked by ideXlab platform
Ren Zongxiao - One of the best experts on this subject based on the ideXlab platform.
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Transient Pressure behaviour of multi-stage fractured horizontal well in stress-sensitive coal seam
International Journal of Oil Gas and Coal Technology, 2019Co-Authors: Ren Zongxiao, Qu Zhan, Jiang Hua-yi, Lou Erbiao, Zhang Jiaming, Yang HongbinAbstract:As an alternative energy of conventional resources, coalbed methane (CBM) has been studied globally. So far, the Pressure distribution model for multi-stage fractured horizontal well (MFW) in stress sensitive coal seam is almost solved by numerical method. In this paper, a Transient Pressure behaviour model of MFW was established. Using perturbation transformation, Laplace transform, image theory and superposition principle the mathematical model was solved. According to the result of calculation, the flow process of MFW can be identified as six regimes. Stress-sensibility primarily influences the latter five stages. The well bore dimensionless Pressure drop is several times larger comparing with the situation that does not take the stress sensitive into account. Accordingly, the influences of some of the critical parameters on the Transient Pressure behaviour were studied, including the fracture number, permeability modulus, storage ratio, and so on. [Received: August 25, 2016; Accepted: October 9, 2017]
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The Transient Pressure behavior model of multiple horizontal wells with complex fracture networks in tight oil reservoir
Journal of Petroleum Science and Engineering, 2019Co-Authors: Ren Zongxiao, Ruifeng Yan, Huang Xing, Liu Wenqiang, Shibao Yuan, Xu Jianping, Haiyan Jiang, Jiaming Zhang, Ruitao YanAbstract:Abstract There are often multiple volume fracturing horizontal wells producing simultaneously in the tight oil reservoir. However, from the published literature, there are a large number of seepage models for a single volume fracturing horizontal well, and there are few literature on the Transient Pressure behavior of multiple horizontal wells. In order to simulate the actual production of multiple horizontal wells in the field, the seepage model of multiple horizontal wells was established in this paper. In this paper, Transient Pressure behavior model of multiple horizontal wells is composed of two parts. One is the seepage model of reservoir and the other is seepage model in the fracture network. Firstly, based on a new plane source function, by virtue of superimposing method, the seepage model of dual medium reservoir is established considering interference between fractures. Secondly, the fluid seepage model of the complex fracture network is established by using “star-triangle” transformation method. Finally, based on the continuity equation, the reservoir model and the fracture flow model are coupled to form a complete Transient Pressure behavior model for multiple volume fracturing horizontal wells. Using this model, we calculate the Transient Pressure behavior of multiple fracturing horizontal wells, and ten typical flow regimes are divided. The influences of some of the critical parameters on the Transient Pressure behavior were studied, including the distance between the multiple wells, storage ratio and cross flow coefficient et al. In a word, this paper provides a very useful model for reservoir engineers regarding evaluating the performance of multiple horizontal wells with complex fracture networks.
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semi analytical model of the Transient Pressure behavior of complex fracture networks in tight oil reservoirs
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Ren Zongxiao, Zhang Jiaming, Wu Xiaodong, Liu Dandan, Chen Zhiming, Wu Xiaojun, Zhang Heng, Tang ZhaoguangAbstract:Abstract Unconventional resources have been successfully exploited with technological advancements in horizontal drilling and multi-stage hydraulic fracturing, especially in North America. Due to pre-existing natural fractures and the presence of stress isotropy, several complex fracture networks can be generated during fracturing operations in unconventional reservoirs. Based on Ozkan's plane source function, by virtue of equivalent conversion and coordinate transformation, a new plane source function was derived that can handle the fluid flow behavior in an inclined fracture in dual media, anisotropic, tight oil reservoir. Using the superimposing method, a semi-analytical model was established to analyze the Transient Pressure behavior of horizontal wells with complex fracture networks. Using this method, we defined five flow regimes: Linear flow, fractures interference flow, first radial flow, cross flow andpseudo-radial flow. The influences of some of the critical parameters on the Transient Pressure behavior were studied, including the fracture number, distribution of the fractures, storage ratio, and so on. This paper provides a useful tool for reservoir engineers regarding fracture design as well as for estimating the performance of horizontal wells with complex fracture networks.
Tang Zhaoguang - One of the best experts on this subject based on the ideXlab platform.
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semi analytical model of the Transient Pressure behavior of complex fracture networks in tight oil reservoirs
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Ren Zongxiao, Zhang Jiaming, Wu Xiaodong, Liu Dandan, Chen Zhiming, Wu Xiaojun, Zhang Heng, Tang ZhaoguangAbstract:Abstract Unconventional resources have been successfully exploited with technological advancements in horizontal drilling and multi-stage hydraulic fracturing, especially in North America. Due to pre-existing natural fractures and the presence of stress isotropy, several complex fracture networks can be generated during fracturing operations in unconventional reservoirs. Based on Ozkan's plane source function, by virtue of equivalent conversion and coordinate transformation, a new plane source function was derived that can handle the fluid flow behavior in an inclined fracture in dual media, anisotropic, tight oil reservoir. Using the superimposing method, a semi-analytical model was established to analyze the Transient Pressure behavior of horizontal wells with complex fracture networks. Using this method, we defined five flow regimes: Linear flow, fractures interference flow, first radial flow, cross flow andpseudo-radial flow. The influences of some of the critical parameters on the Transient Pressure behavior were studied, including the fracture number, distribution of the fractures, storage ratio, and so on. This paper provides a useful tool for reservoir engineers regarding fracture design as well as for estimating the performance of horizontal wells with complex fracture networks.
Zhang Jiaming - One of the best experts on this subject based on the ideXlab platform.
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Transient Pressure behaviour of multi-stage fractured horizontal well in stress-sensitive coal seam
International Journal of Oil Gas and Coal Technology, 2019Co-Authors: Ren Zongxiao, Qu Zhan, Jiang Hua-yi, Lou Erbiao, Zhang Jiaming, Yang HongbinAbstract:As an alternative energy of conventional resources, coalbed methane (CBM) has been studied globally. So far, the Pressure distribution model for multi-stage fractured horizontal well (MFW) in stress sensitive coal seam is almost solved by numerical method. In this paper, a Transient Pressure behaviour model of MFW was established. Using perturbation transformation, Laplace transform, image theory and superposition principle the mathematical model was solved. According to the result of calculation, the flow process of MFW can be identified as six regimes. Stress-sensibility primarily influences the latter five stages. The well bore dimensionless Pressure drop is several times larger comparing with the situation that does not take the stress sensitive into account. Accordingly, the influences of some of the critical parameters on the Transient Pressure behaviour were studied, including the fracture number, permeability modulus, storage ratio, and so on. [Received: August 25, 2016; Accepted: October 9, 2017]
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semi analytical model of the Transient Pressure behavior of complex fracture networks in tight oil reservoirs
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Ren Zongxiao, Zhang Jiaming, Wu Xiaodong, Liu Dandan, Chen Zhiming, Wu Xiaojun, Zhang Heng, Tang ZhaoguangAbstract:Abstract Unconventional resources have been successfully exploited with technological advancements in horizontal drilling and multi-stage hydraulic fracturing, especially in North America. Due to pre-existing natural fractures and the presence of stress isotropy, several complex fracture networks can be generated during fracturing operations in unconventional reservoirs. Based on Ozkan's plane source function, by virtue of equivalent conversion and coordinate transformation, a new plane source function was derived that can handle the fluid flow behavior in an inclined fracture in dual media, anisotropic, tight oil reservoir. Using the superimposing method, a semi-analytical model was established to analyze the Transient Pressure behavior of horizontal wells with complex fracture networks. Using this method, we defined five flow regimes: Linear flow, fractures interference flow, first radial flow, cross flow andpseudo-radial flow. The influences of some of the critical parameters on the Transient Pressure behavior were studied, including the fracture number, distribution of the fractures, storage ratio, and so on. This paper provides a useful tool for reservoir engineers regarding fracture design as well as for estimating the performance of horizontal wells with complex fracture networks.
Shiyi Zheng - One of the best experts on this subject based on the ideXlab platform.
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Diagnostic of changes in reservoir properties from long-term Transient Pressure data with wavelet transform
Journal of Petroleum Science and Engineering, 2016Co-Authors: Fuyong Wang, Shiyi ZhengAbstract:Abstract For conventional well testing which is carried out over several days or several weeks, reservoir properties are usually assumed to be constant, but this assumption is often not valid for analyzing long-term Transient Pressure data acquired from a permanent down-hole gauge, which can record down-hole Transient Pressure data for several years. For example, skin factor may increase due to formation damage, or decrease due to stimulation operations during the time of long-term production. Monitoring changes in reservoir properties is important for reservoir management. This paper proposes a novel method of diagnosing the change in reservoir properties with the wavelet transform. A new diagnostic function has been defined that can detect and quantify changes in reservoir properties. Theoretical analysis and a field example have been conducted and identified to demonstrate this new method and its potential for application in oilfield.
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Unknown Rate History Calculation from Down-hole Transient Pressure Data Using Wavelet Transform
Transport in Porous Media, 2013Co-Authors: Fuyong Wang, Shiyi ZhengAbstract:In the oilfield, rate metering is less satisfying compared with Pressure measurement. Detailed rate history for individual well is not always available. The common practice is that few of the wells are measured together through manifolds and daily, monthly rate or total cumulative production is measured with surface separation equipments. Rate allocation algorithm is utilized to assign production to each well, but the results are inaccurate due to low measurement frequency. For well testing, another problem is that the rate measured from the surface is very often inconsistent with the Pressure measured from down-hole. These problems together make it a very challenging task for engineer to interpret Transient Pressure from the well down-hole gauges. This article introduced wavelet transform method to calculate unknown rate history from the down-hole Transient Pressure data. The Haar wavelet was chosen to process Transient Pressure data, where flow events can be identified with the amplitude of Pressure transform. For the reservoir with constant reservoir-well parameters, the amplitude of Pressure transforms is proportional to the change of rate. Based on this discovery, an algorithm for calculating unknown rate history from cumulative production has been developed. As this method is independent of the developed reservoir model, reservoir heterogeneity, skin, and wellbore storage have no effect on this method. For other complex reservoirs with variable reservoir-well parameters, such as gas reservoir and multiphase reservoir, this algorithm can also be applied resulting in small errors. In practice, the developed method can identify the offset of the flowing rate and the Pressure, so synchronization of the rate and Pressure can be achieved, which greatly increased the confidence of the Pressure data analysis. Both theory and case studies were tested to demonstrate the robustness of this method in practice.
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individual well flowing rate recovery from pdg Transient Pressure with either assigned daily rate or total cumulative production of the well or group of wells through wavelet approach
Journal of Petroleum Science and Engineering, 2009Co-Authors: Shiyi Zheng, Xiaogang LiAbstract:Abstract The advent of permanent down-hole gauge (PDG) makes the real-time reservoir monitoring and management possible, where the long term Transient data can be processed to distill information about the reservoir through using recently developed wavelet transform algorithm. However, the key in analyzing the PDG data, particularly Transient Pressure, is to get the flowing rate history right during the Pressure draw downs and build ups. In practice, the most available flowing rate data include assigned daily rate, total cumulative production of the well or group of wells with a measurement error tolerance at about ±10%. While multiphase down home rate data is rather expensive to have, the industry is desperately looking for ways to get the flowing rate history right. The second big problem in analyzing long term PDG data is that there is a time shift between the flowing rate and the corresponding Transient Pressure. In other words, when the rate goes up, the Pressure also goes up instead of going down as expected. This caused a big problem in reservoir simulation, history matching and numerical well testing. This paper presents a technique based on the recently developed wavelet approach to recover flowing rate history directly from the measured PDG Transient Pressure, under the most common practical conditions described above. In this method, the exact timing of the rate change is identified through wavelet high frequency analysis. Then the rate and Pressure are synchronized in every identified time intervals. Since the rate and the frequency amplitude of the transformed Transient Pressure are proportional, the real rate value in each time interval can be derived under the given common practical conditions. Both synthetic and field examples were used to demonstrate and further validate the developed technique, which showed very promising results.
Will Worthington - One of the best experts on this subject based on the ideXlab platform.
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Transient Pressure Monitoring Results—Nacimiento Water Project
Pipelines 2011, 2011Co-Authors: Will Worthington, John R. Hollenbeck, Thomas C. TrottAbstract:The Nacimiento Water Project in San Luis Obispo County, California, was completed in late 2010, and is now capable of delivering 15,750 acre-feet of raw water annually from Lake Nacimiento through 45 miles of pipeline to its service area. The Project includes three pumping stations, three storage tanks, 45 miles of pipeline ranging from 36- to 12- inches in diameter, and a Supervisory Control and Data Acquisition (SCADA) system. The hydraulic aspects of the system dictated careful attention to hydraulic design, with due consideration of normal and Transient Pressures. The construction contract was modified to add a very intensive hydraulic Transient monitoring system. This Transient monitoring program was installed during construction, and includes nine TP-1 Transient Pressure monitoring systems installed at locations most prone to severe hydraulic Transients. These systems provide detailed information regarding Transient Pressures and are integrated into the SCADA system to provide real-time alerts if threshold Pressures are exceeded. This paper describes the Nacimiento Water Project, the hydraulic design considerations, the network of Transient monitoring systems that is installed, construction considerations, lessons learned, and the results of Transient Pressure monitoring collected during initial startup and testing. Results will include analysis of actual pipe rupture data that occurred during construction, and validation of hydraulic models.
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Transient Pressure Monitoring Program — Nacimiento Water Project
Pipelines 2010, 2010Co-Authors: Will Worthington, John R. HollenbeckAbstract:The Nacimiento Water Project under construction in San Luis Obispo County, California, will deliver 15,750 acre-feet of raw water annually from Lake Nacimiento through 45 miles of pipeline to its service area. The Project includes three pumping stations, three storage tanks, 45 miles of pipeline ranging from 36to 12inches in diameter, and a SCADA system. The hydraulic aspects of the system dictated careful attention to hydraulic design, with due consideration of normal and Transient Pressures. As a follow-up to the hydraulic design, the project will include a very rigorous Transient monitoring program, possibly the most intensive on any pipeline in the USA to-date. This Transient monitoring program scheduled for installation in March 2010 includes nine TP-1 Transient monitoring systems installed at locations most prone to severe hydraulic Transients. These systems provide detailed information regarding Transient Pressures and are integrated into the SCADA system to provide real-time alerts if threshold Pressures are exceeded. This paper describes the Nacimiento Water Project, the hydraulic design considerations, the network of Transient monitoring systems that is installed, and the results of Transient Pressure monitoring collected to-date.
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Transient Pressure Monitoring in El Paso
Pipelines 2008, 2008Co-Authors: Will Worthington, John E. BalliewAbstract:El Paso Water Utilities, which serves one of the nation’s fastest growing metropolitan areas, faced a daunting future in 1989, with dire predictions of water supply exhaustion, a growing water demand, and limited financial resources. The high population growth rate, arid climate, scarce water resources, aging water infrastructure, and growing economy combined to challenge the resourcefulness of the EPWU staff and policy makers. EPWU’s asset management program includes the use of advanced condition assessment technologies and the installation of a state-ofthe-art SCADA system to monitor and control water facilities. Like many pumped water systems, EPWU’s is prone to Transient Pressures; and to detect the Transient Pressures, EPWU implemented the most intensive Transient Pressure monitoring program in the US, which at present consists of 19 continuously monitored stations. The details of this system, as well as the results and benefits are discussed.
