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Cement paste system for plugging casing coupling gap leakage for petroleum well repair

A casing collar and cement slurry technology, which is applied in the field of cement slurry system for plugging the leakage of casing collar gaps for petroleum workover, can solve the problems of casing inner diameter shrinkage, etc., and achieve the effect of facilitating on-site construction and sealing Good results

Inactive Publication Date: 2020-11-24
PANJIN LIAOHE OILFIELD KUNCHENG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In workover, the commonly used method for leakage of casing collar thread gap is to reinforce the lower liner and subsidize the casing. The disadvantage of this method is that the inner diameter of the casing at the leakage gap will be reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Mix 100 parts of superfine cement dry powder, 3 parts of elastic granule dry powder, and 1 part of plastic granule, and then mix them with water to form a slurry with a density of 1.62 g / cm3 to form this product. Nitrile rubber particles with a hardness of 60, the plastic particles are highly crystalline polymers of polyethylene terephthalate, and the particle size is less than 5 microns.

[0011] For this product that embodiment 1 obtains is carrying out strength test data

[0012] Well Qiang 1-H102, the tested casing collar position: 1696.62m, 1097.99m leakage.

[0013] It is required to squeeze the cement to plug the leakage point, wait for 48 hours, drill the cement plug, and test the pressure to 20 MPa without dropping.

[0014] When plugging, adopt the slurry feeding pressurized extrusion method. According to the plugging position, the product is sent into the plugging position through the tubing, and the excess cement slurry is washed out by lifting the string ...

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PUM

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Abstract

The invention relates to the technical field of oil field well repair, in particular to a cement paste system for plugging casing coupling gap leakage for petroleum well repair. The cement paste system consists of dry powder and water, wherein the dry powder comprises the following components in parts by mass: 100 parts of superfine cement dry powder, 3 parts of elastic particle dry powder and 1 part of plastic particles; the three components of the dry powder are uniformly mixed and stirred and then blended with water to form a paste product with the density of 1.62 g / cm<3>. According to theinvention, the elastic material and the plastic material are gathered in the threaded gap of leakage to deform, extend, fill and compact; the requirement for leakage pressure test of the threaded gapof the plugged casing coupling is met, the inner diameter of the casing is not changed after leakage repair of the threaded gap of the plugged casing, through reasonable proportion, cement paste has good blending performance, field construction is facilitated, the plugging effect is good, and the pressure test of the leakage well section of the threaded gap of the plugged casing coupling can meetthe design requirement after plug drilling.

Description

Technical field: [0001] The invention relates to the technical field of oil field workover, in particular to a cement slurry system used for oil workover to seal the leakage of casing collar gaps. Background technique: [0002] In workover, the commonly used method for leakage of casing collar thread gap is to reinforce the lower liner and subsidize the casing. The disadvantage of this method is that the inner diameter of the casing at the leakage gap will be reduced. Invention content: [0003] The technical problem to be solved by the present invention is to provide a cement slurry system for oil well workover to plug the leakage of casing collar gaps. Due to the addition of elastic materials and plastic materials, the cement slurry system realizes the accumulation of elastic materials and plastic materials. Deformed, stretched, filled and compacted in the gap of the leaking thread, meeting the requirements of the leakage and pressure test for sealing the thread gap of t...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00672C04B24/24C04B24/283
Inventor 王学王华
Owner PANJIN LIAOHE OILFIELD KUNCHENG IND