The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

Ruihe Wang - One of the best experts on this subject based on the ideXlab platform.

  • novel mechanical Foam breaker based on self oscillation for promoting the application of Foam Drilling technology
    Chemical Engineering Science, 2018
    Co-Authors: Peng Wang, Hongjian Ni, Chuanwei Wang, Ruihe Wang
    Abstract:

    Abstract DeFoaming of Foam Drilling fluid on the ground is the key to its cyclic utilization. This paper proposes a novel mechanical Foam breaker based on self-oscillation to promote the application of Foam Drilling technology. Simulation results showed that the combined effects of the negative pressure, collision, extrusion, and shear generated in the cavity cause the Foam to fracture. A prototype was developed, and the effects of the structural parameters, components of the Foam Drilling fluid, cuttings, and temperature on the deFoaming percentage were investigated in experiments. The experimental results showed that the diameter of the upper nozzle was the major structural factor influencing the deFoaming. A smaller diameter for the upper nozzle resulted in a higher deFoaming percentage. The deFoaming percentage first increased and then decreased with increases in the lower nozzle diameter, cavity length, and diameter, which indicated that there is an optimum structure for the Foam breaker. The cutting concentration and temperature could improve the deFoaming percentage to some extent, and the salts had a minor influence on the deFoaming percentage. The results verified the feasibility and advantages of using the mechanical Foam breaker and laid a solid theoretical foundation for its application in petroleum and natural gas Drilling.

Antonio C V M Lage - One of the best experts on this subject based on the ideXlab platform.

  • An overview of air/gas/Foam Drilling in Brazil
    Distributed Computing, 1997
    Co-Authors: A F Negrao, Antonio C V M Lage
    Abstract:

    The air, gas and Foam Drilling has been used in specific areas in Brazil as an alternative for problems caused by the traditional Drilling process. Considering those two-phase flow Drilling operations, this work focuscs on their benefits and operational improvements. Furthermore, the comparison between the performance of conventional and two-phase flow Drilling has bccn showing this new technique has some advantages: (1) minimum or no damage to sensitive pay zones. (2) immediate and continuous evaluation of cuttings for hydrocarbon shows, (3) avoidance of lost circulation, and (4) higher penetration ratcs in hard formations. Two very recent on-shore two-phase flow Drilling field cases, one with joint pipe connections, and the other with coil tubing are mainly described Thcir results are analyzed concerning the surface equipment design, appropriate technique for connections when using drill pipe underbalanced Drilling, as well as the comparison of predictions of computer programs to real field data. Future plans for the continuity of the two-phase flow Drilling operations in Brazil are also commented. Additionally, potential areas and concrete actions for improving operational feasibility of this emerging technology are identified. The target is a safer and economical air, gas or Foam Drilling operation.

  • an overview of air gas Foam Drilling in brazil
    Distributed Computing, 1997
    Co-Authors: A F Negrao, Antonio C V M Lage
    Abstract:

    The air, gas and Foam Drilling has been used in specific areas in Brazil as an alternative for problems caused by the traditional Drilling process. Considering those two-phase flow Drilling operations, this work focuscs on their benefits and operational improvements. Furthermore, the comparison between the performance of conventional and two-phase flow Drilling has bccn showing this new technique has some advantages: (1) minimum or no damage to sensitive pay zones. (2) immediate and continuous evaluation of cuttings for hydrocarbon shows, (3) avoidance of lost circulation, and (4) higher penetration ratcs in hard formations. Two very recent on-shore two-phase flow Drilling field cases, one with joint pipe connections, and the other with coil tubing are mainly described Thcir results are analyzed concerning the surface equipment design, appropriate technique for connections when using drill pipe underbalanced Drilling, as well as the comparison of predictions of computer programs to real field data. Future plans for the continuity of the two-phase flow Drilling operations in Brazil are also commented. Additionally, potential areas and concrete actions for improving operational feasibility of this emerging technology are identified. The target is a safer and economical air, gas or Foam Drilling operation.

Greg D. Hawley - One of the best experts on this subject based on the ideXlab platform.

  • Chpater 10 – Stable Foam Drilling
    Air and Gas Drilling Field Guide, 2009
    Co-Authors: William C. Lyons, Reuben L. Graham, Greg D. Hawley
    Abstract:

    Publisher Summary The term stable Foam describes a special class of aerated Drilling fluids and work over completion fluids. This class of Drilling fluid is made up of a specific mixture of incompressible fluids injected with compressed air or other gases. To create a stable Foam Drilling fluid, the incompressible component is usually a mixture of fresh water with a surfactant Foaming agent. In a typical deep Drilling operation, the Foam mixture is injected into the top of the inside of the drill string. The mixture of the incompressible fluid and compressed air flows as an aerated fluid mixture down the inside of the drill string to the bottom of the string just above the drill bit nozzles. The Foam is formed at the bottom of the annulus and then flows as stable Foam up the annulus. In deep wells, it is often necessary to place a backpressure valve and pressure gauge in the return line from the annulus, which are used to modulate the flow so that the flow remains stable Foam throughout the annulus and return line up to the valve. In reverse circulation Drilling or work over operations, the performed Foam can be injected into the top of the annulus. Flowing Foam will create large friction forces and these forces are a function of the pressure conduit diameter. This Foam property precludes performing Foam for injection into the inside of the drill string in deep direct circulation operations.

  • Air, Gas, and Unstable Foam Drilling
    Air and Gas Drilling Field Guide, 2009
    Co-Authors: William C. Lyons, Reuben L. Graham, Greg D. Hawley
    Abstract:

    This chapter outlines the steps used to plan a successful deep air and gas Drilling operation and illustrates the application of these steps and methods to the planning of a typical deep Drilling operation. Deep Drilling operations with air and gas Drilling technology are used in the recovery of oil and natural gas and in the recovery of geothermal steam and hot water. The application of air and gas Drilling technology is usually limited to either performance Drilling operations in competent rock formations or under-balanced Drilling operations in low-pressure reservoirs. The advantage of air and gas Drilling operations is that the bottom hole annulus pressures can be designed to be below the reservoir bottom hole pressure. Air and gas Drilling operations are different from traditional mud Drilling operations and require more intensive attention on the part of the on-site Drilling operation supervisor. Deep air and gas Drilling operations use a variety of compressed gases as the Drilling fluid. The majority of the operations use compressed air or membrane-generated nitrogen. Unlike the aerated and stable Foam Drilling fluids, the modeling of air Drilling fluids is not a rheology issue. The major issues with air Drilling fluids are downhole combustion and the ability of the air Drilling fluid to carry formation water from the well.

Gao Li - One of the best experts on this subject based on the ideXlab platform.

  • Foam Drilling in natural gas hydrate
    Thermal Science, 2015
    Co-Authors: Yingfeng Meng, Gao Li, Tian Xu
    Abstract:

    The key problem of Foam Drilling in natural gas hydrate is prediction of characteristic parameters of bottom hole. The simulation shows that when the well depth increases, the Foam mass number reduces and the pressure increases. At the same depth, pressure in drill string is always higher than annulus. The research findings provide theoretical basis for safety control.

  • Study on three-phase circular micro-Foam Drilling fluid technology and its application in Cainan oilfield.
    Driuing Fluid and Completion Fluld, 2004
    Co-Authors: Gao Li
    Abstract:

    According to investigative data of 96 developing wells in Cainan oilfield of Xinjiang, there were 70 absorption wells, i.e., 72.9% of the wells investigated were absorption wells. The primary lost circulation zone is from 400 m to 700 m and the secondary zone is from 1800 m to 2000 m. While lost circulation occurred, no any Drilling fluid returned. Due to lost circulation while Drilling hampers severely ROP and makes Drilling cost up, three phase circular micro Foam Drilling fluid system was developed to cope with severe lost circulation existing in low pressure fracture type reservoir of the upper section. The system consists of Foaming agent, stabilizing agent and curing agent. It can be recycled without special degassing and aeration equipments while remains part advantages of common Foam Drilling fluid. Based on studies of composing, micro conformation, stability and equivalent density of micro Foam Drilling fluid, three phase circular micro Foam Drilling fluid technology was developed and was used in the field. The results showed that the Drilling fluid has properties of high stability, easily preparing in site, good performance, strong resistance to fouling, as well as leak resistance and plugging effect.

Zuo Feng - One of the best experts on this subject based on the ideXlab platform.

  • Study and application of circular micro-Foam Drilling fluid technology
    Driuing Fluid and Completion Fluld, 2002
    Co-Authors: Zuo Feng
    Abstract:

    During the exploration and development of low-pressured fractured buried hill reservoir and sandstone reservoir, serious lost circulation was encountered when using the conventional water based Drilling fluid. High temperature tolerant circular micro-Foam Drilling fluid system was developed by Drill ing Tech. Research Inst. of Huabei Petroleum Administration. Laboratory evaluations were conducted on the dosage of Foaming agent and Foam stabilizer, and the stability, temperature tolerance, contamination resistance and reservoir protection of the Drilling fluid. Testing results showed that the system has good Foaming capability, large amount of fine micro-Foam could be formed when the base fluid contacted with air; the Foam has good stability, and the Foam could keep stable in high temperature and long time circulation; the system also has high contamination resistance, and the formation fluid has good compatibility with Drilling fluid additives. When batching the micro Foam Drilling fluid, the best adding amounts of foa-ming agent and Foam stabilizer are 0. 4% - 1. 0% and 0. 1%-0. 3% respectively. Field using showed that the micro-Foam Drilling fluid has the characteristic of low density, and in Drilling the third section, it kept stable and solved the problem of lost circulation when Drilling the low-pressured reservoir, thus avoided formation damage and protected reservoir. The Drilling fluid has good cuttings transportation with most of the cuttings returned to the surface, which totally met the engineering and geological needs of developing low-pressured oil and gas reservoir.