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Plugging agent for temporary plugging in oil and gas well repairing

A plugging agent and technology for oil and gas wells, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems that affect the effect of workover operations, timely recovery of productivity, easy to pollute reservoirs, low plugging strength, etc., to achieve Good water absorption and water control ability, enhanced degradation effect, and improved pressure bearing capacity

Pending Publication Date: 2021-11-09
北京国海能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these plugging agents have different disadvantages in the process of use: low plugging strength, difficulty in removal, easy to pollute reservoirs, etc., affecting the effect of workover operations and timely recovery of productivity

Method used

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  • Plugging agent for temporary plugging in oil and gas well repairing
  • Plugging agent for temporary plugging in oil and gas well repairing

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] Its preparation method comprises the following steps:

[0016] Step 1: In the alcohol-water mixed solvent containing 40% methanol, add polymerization monomer, crosslinking agent, biopolymer, stir and mix;

[0017] Step 2: Under agitation, pass nitrogen (purity ≥ 99.99%) to remove oxygen for 30 minutes, then add initiator, and turn on the induced ultraviolet light source (wavelength 200nm-300nm) to initiate the reaction;

[0018] Step 3: After the solution viscosity is thickened, under nitrogen protection, add reinforcing agent, gel breaker and mix evenly;

[0019] Step 4: stop stirring, polymerize until the temperature rises to the highest temperature, heat preservation and aging for 2-3h;

[0020] Step 5: After the rubber block is taken out, it is cut into pellets, dried at 90-105° C. until the water content is ≤10%, crushed and pelletized.

Embodiment 1

[0022] A plugging agent for well workover temporary plugging and a preparation method thereof, the plugging agent comprises the following raw materials made in parts by mass: polymerized monomer: 20 parts, biopolymer: 5 parts, crosslinking agent: 1.0 part, Strengthening agent: 70 parts, gel breaker: 0.01, initiator: 0.003 part; the polymerized monomer is selected from the mixture of acrylamide and methacrylamide; the biopolymer is selected from xanthan gum and guar gum A kind; The crosslinking agent is selected from ethylene glycol dimethacrylate; The reinforcing agent is selected from one or more mixtures in potassium chloride, sodium chloride, sodium nitrate, potassium nitrate; The glue is a mixture of benzoyl peroxide and ferrous sulfate, and the molar ratio of benzoyl peroxide and ferrous sulfate is 2:1; the initiator is azoisobutylcyanoformamide.

[0023] Its preparation method comprises the following steps:

[0024] Step 1: In the alcohol-water mixed solvent containing ...

Embodiment 2

[0030] A plugging agent for well workover temporary plugging and a preparation method thereof. The plugging agent comprises the following raw materials made in parts by mass: polymerized monomer: 40 parts, biopolymer: 10 parts, crosslinking agent: 0.1 part, Strengthening agent: 50 parts, gel breaker: 0.05 parts, initiator: 0.003 parts; the polymerized monomer is selected from the mixture of acrylamide and methacrylamide; the biopolymer is selected from xanthan gum and guar gum A kind of; The cross-linking agent is selected from ethylene glycol dimethacrylate; The reinforcing agent is selected from one or more mixtures in potassium chloride, sodium chloride, sodium nitrate, potassium nitrate; The gel breaker is a mixture of benzoyl peroxide and ferrous sulfate, and the molar ratio of benzoyl peroxide and ferrous sulfate is 1:1; the initiator is azoisobutylcyanoformamide.

[0031] Its preparation method comprises the following steps:

[0032] Step 1: In the alcohol-water mixed ...

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Abstract

The invention belongs to a plugging agent for temporary plugging in oil and gas well repairing. The plugging agent comprising the following raw materials in parts by mass: 20 to 40 parts of a polymeric monomer, 5 to 10 parts of a biopolymer, 0.1 to 1.0 part of a cross-linking agent, 50 to 70 parts of a reinforcing agent, 0.01 to 0.05 part of a gel breaker and 0.001 to 0.003 part of an initiator, wherein the polymeric monomer is selected from a mixture of acrylamide and methacrylamide; the biopolymer is one selected from xanthan gum and guar gum; the cross-linking agent is selected from ethylene glycol dimethacrylate; the reinforcing agent is one or a mixture of more than one selected from potassium chloride, sodium chloride, sodium nitrate and potassium nitrate; the gel breaker is a mixture of benzoyl peroxide and ferrous sulfate, and a molar ratio of benzoyl peroxide to ferrous sulfate is (1-2): 1; and the initiator is 1-((cyano-1-methylethyl)azo)formamide. The plugging agent has the advantages that pressure-bearing strength is good, self-degradation release can be realized, and damage to a stratum is small.

Description

technical field [0001] The invention belongs to the field of oilfield chemicals, and in particular relates to a plugging agent for temporary plugging of oil and gas wells. Background technique [0002] In the process of oil and gas exploitation, as the oil and gas in the formation are extracted, the formation will be short-lived and large pores will appear, which will aggravate the leakage of oil and gas wells. At the same time, in the process of oil production, gas production, water injection, and gas injection, oil and gas wells fail due to various factors, resulting in production and injection stoppages, which affect the normal work of oil and gas wells. They must be restored through workover operations. The working fluid is the necessary working fluid to ensure the safety of workover operations, but the leakage of working fluid is prone to occur in the formation with serious deficit, which affects the safety of workover operations on the one hand, and on the other hand, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/504C09K8/508C09K8/514C08F251/00C08F220/56C08F222/14
CPCC09K8/514C09K8/5083C09K8/5045C08F251/00C09K2208/26C08F220/56C08F222/102
Inventor 姚佩锋李翔车赛
Owner 北京国海能源技术研究院
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