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Preparation method and application of self-degradable leakage-proof plugging polymer composite material suitable for deepwater and ultra-deepwater drilling fluids

A technology of composite materials and polymers, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems that cannot meet the protection requirements of deep water and ultra-deep water drilling reservoirs, leak prevention and plugging, retaining wall plugging and protection of reservoirs. Layer permeability is difficult to meet at the same time and other issues

Pending Publication Date: 2021-10-26
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to overcome the problems existing in the prior art that it is difficult to simultaneously satisfy the leakage prevention and plugging, retaining wall plugging and protection reservoir permeability, and cannot meet the protection requirements of deep water and ultra-deep water drilling reservoirs

Method used

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  • Preparation method and application of self-degradable leakage-proof plugging polymer composite material suitable for deepwater and ultra-deepwater drilling fluids
  • Preparation method and application of self-degradable leakage-proof plugging polymer composite material suitable for deepwater and ultra-deepwater drilling fluids
  • Preparation method and application of self-degradable leakage-proof plugging polymer composite material suitable for deepwater and ultra-deepwater drilling fluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This example is to illustrate the self-degradation leakage prevention and plugging polymer composite material prepared by the method of the present invention.

[0053] Weigh 100 parts by weight of polymer resin particles in the reaction kettle according to the weight ratio, and gradually heat up to 175°C by heating in an oil bath, and then add 1.8 parts by weight of organic complexing accelerator and 12 parts by weight of inorganic weak acid under stirring conditions. Salt, 3.7 parts by weight of inorganic alkali metal hydroxide, stirred and reacted for 50 minutes; then, added 62 parts by weight of triazine melamine organic matter, stirred and reacted for 15 minutes; stopped heating and stirring, and the reactant naturally cooled to obtain off-white solid product , crushing the solid product to obtain self-degradation leak-proof plugging polymer composite materials with different particle sizes;

[0054] The polymer resin described therein contains the structural unit s...

Embodiment 2

[0064] This example is to illustrate the self-degradation leakage prevention and plugging polymer composite material prepared by the method of the present invention.

[0065] Weigh 100 parts by weight of polymer resin particles in the reaction kettle according to the weight ratio, gradually heat up to 175°C by heating in an oil bath, and then add 1.2 parts by weight of an organic complexing accelerator and 18 parts by weight of an inorganic weak acid under stirring conditions. Salt, 2.6 parts by weight of inorganic alkali metal hydroxide, stirred and reacted for 40 minutes; then, added 37 parts by weight of triazine melamine organic matter, stirred and reacted for 10 minutes; stopped heating and stirring, and the reactant naturally cooled to obtain off-white solid product , crushing the solid product to obtain self-degradation leak-proof plugging polymer composite materials with different particle sizes;

[0066] The polymer resin described therein contains the structural unit s...

Embodiment 3

[0076] This example is to illustrate the self-degradation anti-leakage plugging polymer composite material prepared by the method of the present invention and its application, especially the application in deep water and ultra-deep water drilling fluid.

[0077] The specific composition of the deepwater and ultra-deepwater self-degradable drilling fluid system is: fresh water + 1.0% fluid loss reducer PF-FLOTROL + 0.3% PF-PLUS + 0.3% PF-XC + 0.7% anti-sudden lubricant PF-HLUB + 3.0% Strong inhibitor polyamine PF-UHIB + 2.5% coating agent PF-EZCARB + ​​5% KCl + 15% NaCl + 3.0% self-degradation leak-proof plugging polymer composite material S1.

[0078] Among them, fluid loss reducer PF-FLOTROL, PF-PLUS, PF-XC, anti-slagging lubricant PF-HLUB, strong inhibitor polyamine PF-UHIB, and coating agent PF-EZCARB were provided by China Oilfield Services Co., Ltd. supply.

[0079] As a result, the self-degradable drilling fluid system in deep water and ultra-deep water was prepared, ma...

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Abstract

The invention belongs to the technical field of drilling of deepwater and ultra-deepwater oil and gas wells, and discloses a preparation method and application of a self-degradable leakage-proof plugging polymer composite material suitable for deepwater and ultra-deepwater drilling fluids. The self-degradable anti-leakage plugging polymer composite material specifically comprises 37 to 75 percent of polymer resin, 12 to 36 percent of triazine melamine organic matters, 22 to 49 percent of inorganic weak acid salt, 5 to 16 percent of inorganic alkali metal hydroxide and 2.2 to 7.8 percent of an organic complexing accelerant. The polymer resin contains a structural unit as shown in a formula (I); the triazine melamine organic matter contains a structure as shown in a formula (II); and the inorganic weak acid salt contains a structure as shown in a formula (III). The self-degradable anti-leakage plugging polymer composite material and a formed drilling fluid filter cake can be automatically degraded after drilling is finished, complete plug removal is basically achieved, the recovery value of core permeability reaches 95% or above, the excellent temporary plugging and reservoir protection effects are achieved, acid pickling and other operations are not needed, a drilling period is shortened, and drilling cost is saved.

Description

technical field [0001] The invention relates to the technical field of ultra-deep water oil and gas development, in particular to a self-degradation anti-leakage plugging polymer composite material suitable for ultra-deep water drilling fluid, and a preparation method for the self-degradation anti-leakage plugging polymer composite material suitable for ultra-deep water drilling fluid , an ultra-deep water drilling fluid system comprising the self-degradation anti-leakage plugging polymer composite material. Background technique [0002] In recent years, with the increasing demand for oil and gas resources in my country, the contradiction between oil and gas supply and demand has become increasingly prominent. my country's offshore oil and gas resources are very rich, especially in the deep water area of ​​the South my country Sea. The industry refers to waters with a depth of more than 500 meters as deep water, and waters with a depth of more than 1,500 meters as ultra-deep...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/12
CPCC09K8/5086C09K8/12
Inventor 刘和兴管申徐一龙刘楷于晓东王成文薛毓铖王瑞和
Owner CNOOC TIANJIN BRANCH
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