Self-decomposition temporary plugging agent for workover fluid and using method of temporary plugging agent

A technology of workover fluid and self-decomposition, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in plugging, and achieve the effect of low preparation equipment requirements, high plugging strength, and excellent fluidity

Inactive Publication Date: 2015-11-25
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the oil and gas well is put into normal production, the temporary plugging agent reversely breaks through the pores under the formation pressure or is dissolved by the produced oil, and the formation permeability recovers, achieving the effect of first plugging and then releasing, while the oil-soluble temporary plugging agent The disadvantage is that it is difficult to remove plugging in gas wells
The precipitate dissolves in crude oil to remove plugs, but the disadvantage is that it is insoluble in water, and it is difficult to remove plugs in gas wells

Method used

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  • Self-decomposition temporary plugging agent for workover fluid and using method of temporary plugging agent

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Self-decomposing temporary plugging agent formula combination: 30 mass parts of polylactic acid ellipsoidal large particles with a particle diameter of about 5 mm, 50 mass parts of polylactic acid small particles with a particle diameter of about 30 mesh, 0.4 mass parts of polylactic acid short fibers with a length of 5 mm and 19.6 parts by mass of polylactic acid superfine powder with an average particle diameter of 300 meshes.

[0030] As mentioned above, the method of using self-decomposing temporary plugging agent for workover fluid is as follows:

[0031] 1) Preparation of thickened workover fluid: under stirring, slowly add 0.5 parts by mass of hydroxypropyl guar gum to 100 parts by mass of clear water, and swell for 30 minutes to obtain a thickened workover fluid;

[0032] 2) Preparation of temporary plugging type workover fluid: under stirring, slowly add polylactic acid short fibers into the thickened workover fluid, disperse for 15 minutes until uniform, add t...

Embodiment 2

[0036] Self-decomposing temporary plugging agent formula combination: 10 parts by mass of polylactic acid ellipsoidal large particles with a particle diameter of about 1 mm, 60 parts by mass of small polylactic acid particles with a particle diameter of about 40 mesh, 0.2 parts by mass of short polylactic acid fibers with a length of 3 mm and 29.8 parts by mass of polylactic acid superfine powder with an average particle diameter of 100 mesh.

[0037] As mentioned above, the method of using self-decomposing temporary plugging agent for workover fluid is as follows:

[0038] 1) Preparation of thickened workover fluid: under stirring, slowly add 0.4 parts by mass of hydroxypropyl guar gum to 100 parts by mass of clear water, and swell for 30 minutes to obtain a thickened workover fluid;

[0039] 2) Preparation of temporary plugging type workover fluid: under stirring, slowly add polylactic acid short fibers into the thickened workover fluid, disperse for 15 minutes until uniform...

Embodiment 3

[0041] Self-decomposing temporary plugging agent formula combination: 40 parts by mass of polylactic acid ellipsoidal large particles with a particle diameter of about 10 mm, 20 parts by mass of small polylactic acid particles with a particle diameter of about 40 mesh, 1 part by mass of short polylactic acid fibers with a length of 10 mm and 39 parts by mass of polylactic acid superfine powder with an average particle diameter of 200 meshes.

[0042] As mentioned above, the method of using self-decomposing temporary plugging agent for workover fluid is as follows:

[0043] 1) Preparation of thickened workover fluid: under stirring, slowly add 0.6 parts by mass of hydroxypropyl guar gum to 100 parts by mass of clear water, and swell for 30 minutes to obtain a thickened workover fluid;

[0044] 2) Preparation of temporary plugging type workover fluid: under stirring, slowly add polylactic acid short fibers into the thickened workover fluid, disperse for 15 minutes until uniform,...

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Abstract

The invention discloses a self-decomposition temporary plugging agent for a workover fluid and a using method of the temporary plugging agent. The self-decomposition temporary plugging agent comprises 10-40 parts of particles I with the particle size ranging from 1 mm to 10 mm by mass, 20-60 parts of particles II with the particle size ranging from 20 meshes to 40 meshes by mass, 0.2-1 part of staple fibers with the length ranging from 3 mm to 10 mm by mass and 18-40 parts of superfine powder with the particle size ranging from 100 meshes to 300 meshes by mass; the particles I, the particles II, the staple fibers and the superfine powder are any one of or a mixture of several of polylactic acid, poly lactic-glycolic acid and polycaprolactone in any ratio. The using method of the agent comprises steps as follows: the staple fibers are evenly mixed in the water-based workover fluid, other components of the self-decomposition temporary plugging agent are added, and the mixture is evenly mixed. The self-decomposition temporary plugging agent for the workover fluid can be completely degraded into carbon dioxide and water in an aqueous solution and causes no damage to stratums, and the using method of the agent is suitable for on-site preparation.

Description

technical field [0001] The invention relates to the field of oil and gas well completion, in particular to a self-decomposing temporary plugging agent for workover fluid and a use method thereof. Background technique [0002] In the later stages of the oilfield development of the present invention, the contradiction between injection and production is prominent, which aggravates the original heterogeneity of the oil layer and the difference between wells and layers, the energy of the oil layer cannot be supplemented, and the loss wells and loss layers increase correspondingly. And during the workover operation, a large amount of well killing fluid is lost. In order to solve this problem, a temporary plugging agent suitable for workover fluid is generally selected. [0003] The development of temporary plugging agent technology has a long history. The earliest record of temporary plugging and diverting agents appeared in 1936. Halliburton disclosed a method of using foam so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514C09K8/885C09K8/905C09K2208/08
Inventor 邹鹏王林张世林张建华李诗仙姜有才
Owner CNPC BOHAI DRILLING ENG
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