Test method for simulating restoration of deformation sleeve under stratum confining pressure

A technology for simulating formations and testing methods, which is applied in surveying, earthwork drilling, wellbore/well components, etc. It can solve problems such as difficult to control shaping force and lifting force accurately, achieve low test price, ensure test accuracy, and install The effect of simple structure

Inactive Publication Date: 2013-04-03
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a test method for simulating the repairing process of deformed casing under formation confining pressure, so as to solve the problem of the shaping force and upper pressure required by various impact shaping tools for repairing deformed casing under different formation depths and different confining pressures. The technical problem that the pulling force is difficult to control accurately, and while achieving the above goals, simplify the complexity of the test system and reduce the cost of equipment

Method used

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  • Test method for simulating restoration of deformation sleeve under stratum confining pressure
  • Test method for simulating restoration of deformation sleeve under stratum confining pressure
  • Test method for simulating restoration of deformation sleeve under stratum confining pressure

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Embodiment Construction

[0017] see figure 1 , fix the impact pear-shaped tube expander 4 (one of the impact shaping tools) at the center of the top of the universal hydraulic testing machine 1 with the top clamp 2 and the matching joint 3 with the strain gauge 9 on the outer wall; use the universal hydraulic testing machine 1. The characteristics of the up and down reciprocating motion make the pear-shaped tube expander 4 impact the deformed sleeve 5 at a certain speed. In order to prevent the deformed sleeve 5 from moving up and down during the plastic repair process, a circular groove is opened at the lower end of the deformed sleeve 5 11 and fix it at the center of the bottom of the universal hydraulic testing machine 1 with the matching bottom clamp 7, and at the same time, use the clamping tool 6 that matches the shape of the deformed section 12 of the deformed sleeve 5 to clamp the deformed section of the sleeve, and pass the torque The wrench adjusts the torque of the hex bolt 8 on the clampin...

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Abstract

The invention provides a test method for simulating restoration of a deformation sleeve under stratum confining pressure. The test method is characterized in that a universal hydraulic tester with a YS32-500 tetragonal column is used to generate external force by moving back and forth up and down, an impact reshaping tool fixed at the top center of the hydraulic tester is allowed to be fixed on the deformation sleeve right at the center of the bottom of the hydraulic tester by impact at certain speed, and reshaping force required in restoring the deformation sleeve and tension required by a lifting tool after reshaping of the impact reshaping tool can be tested by a strain plate and a static strain gauge in reshaping process. The deformation sleeve is provided with a clamping tool at a deformation section, and test of restoration of the deformation sleeve under specific confining pressure can be simulated by adjusting magnitude of torque of a bolt on the deformation sleeve. Restoration of the downhole deformation sleeve can be simulated truly, test result is accurate, and accurate construction parameters can be provided for restoration of the sleeve by a pear-shaped tube expander. The test method is suitable for the technical field of oil, natural gas downhole sleeve restoration.

Description

technical field [0001] The invention relates to a test method for simulating the repairing process of a deformed casing under formation confining pressure. Background technique [0002] Casing is a necessary key tool in the process of oil and gas extraction, which plays a role in supporting the well wall and establishing oil and gas passages in the process of oil and gas extraction. However, after a period of production in many oil and gas fields, due to factors such as geology, engineering, and corrosion, many oil and gas wells have casing damage to varying degrees, which seriously affects the safety or normal production of oil and gas fields. The main form of bushing damage is the necking deformation of the bushing, that is, the cross section of the deformed section of the bushing is elliptical. In order to restore the normal production of oil and gas fields, scientific workers have developed many plastic repair tools for the repair of necked and deformed casings, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00
Inventor 林元华邓宽海朱红钧王其军曾德智田家林孔祥伟武元鹏周莹谢娟戚兴
Owner SOUTHWEST PETROLEUM UNIV
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