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A method for judging the failure cause of plugging zone of fractured reservoir leakage plugging material

A technology of plugging materials and judging methods, applied in the directions of analysis materials, instruments, measuring devices, etc., can solve the problems of instability of plugging belts, leakage failures, lack of plugging belts, etc., and achieves low economic cost, simple operation process, The effect of improving leakage control efficiency

Active Publication Date: 2019-10-18
SOUTHWEST PETROLEUM UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

The instability of the sealing zone is an important reason for leakage failure and repeated leakage
[0004] However, there is still a lack of effective analysis methods for the instability of the plugging zone at home and abroad, and it is difficult to accurately determine the cause of the instability.

Method used

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  • A method for judging the failure cause of plugging zone of fractured reservoir leakage plugging material
  • A method for judging the failure cause of plugging zone of fractured reservoir leakage plugging material
  • A method for judging the failure cause of plugging zone of fractured reservoir leakage plugging material

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Embodiment 1

[0028] In order to verify the reliability of the present invention, materials commonly used in drilling sites were selected as experimental plugging materials, and indoor experiments on crack plugging were carried out to analyze the friction characteristics of the plugging material before the plugging zone was unstable. Reasons are determined. The specific operation steps are as follows:

[0029] a. The commonly used plugging materials in the drilling site are divided into three types: rigid materials, elastic materials and fibers, and the selected plugging materials are divided into three types: a single rigid material, a combination of rigid materials and elastic materials, and a combination of rigid materials and fibers ;

[0030] b. Mix the plugging materials of each combination in step a evenly according to a certain ratio, and divide them into two parts. One part is tested for the initial friction coefficient, and the other part is added to the drilling fluid at 150 ° C...

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Abstract

The invention discloses a method for judging failure reasons of a blocking belt of a crack type reservoir blocking material. The method comprises the following steps: dividing a crack type reservoir blocking material into two parts, and carrying out primary friction coefficient testing by using one part; stirring the other part of the crack type reservoir blocking material with a drilling fluid ata high temperature, carrying out crack blocking testing, collecting a blocking material inside a crack rock sample before instability of a blocking belt, confirming a variation curve of friction coefficients of the blocking material along with time, and judging the instability reasons of the blocking belt of the blocking material according to static friction sectional times and sliding friction coefficients. High-temperature aging of the blocking material is taken into account, and circulation corrosion of the blocking material in a well cylinder is relatively really simulated; on the basis of the structure and the stability of the blocking belt of the blocking material, pressure bearing instability of the blocking belt in actual blocking process is simulated, instability reasons of the blocking belt of the blocking material are accurately judged, important bases are provided for rapidly and effectively solving blocking belt instability problems, and the method also has great significance for reasonable preference of crack type reservoir blocking materials.

Description

technical field [0001] The invention relates to the field of working fluid loss control in the drilling and completion process of the oil and natural gas industry, in particular to a method for judging the instability cause of the plugging zone of a plugging material in a fractured reservoir. Background technique [0002] Fractured oil and gas reservoirs are widely distributed in the world and have huge resources. The developed fractures are the main seepage channels for oil and gas, but the existence of fractures will lead to the loss of drilling fluid. Drilling fluid loss not only loses a large amount of drilling fluid, prolongs the drilling cycle, induces accidents such as well collapse and blowout, but also causes serious reservoir damage, which greatly restricts the efficient development of oil and gas reservoirs. Therefore, the leakage control of fractured reservoirs is particularly important. [0003] The commonly used physical plugging materials for fractured reserv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/02
Inventor 康毅力闫霄鹏许成元游利军张敬逸王凯成
Owner SOUTHWEST PETROLEUM UNIV
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