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A kind of delayed cross-linking gel profile control agent and preparation method thereof

A technology for cross-linking gel and profile control agent, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as limited ability to delay cross-linking, and achieve a simple preparation method, easy operation, and delay in gel formation. effect of time

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ability of the above non-ionic polyacrylamide / phenolic resin type water shutoff agents to delay crosslinking is very limited

Method used

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  • A kind of delayed cross-linking gel profile control agent and preparation method thereof
  • A kind of delayed cross-linking gel profile control agent and preparation method thereof
  • A kind of delayed cross-linking gel profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The delayed cross-linking gel profile control agent in this example is composed of the following components: partially hydrolyzed polyacrylamide (the molecular weight of HPAM is 1.5×10 7 , the degree of hydrolysis is 25%) 0.3g, β-cyclodextrin / phenol inclusion complex 0.5g, urotropine 0.4g, citric acid 0.15g, competitive inclusion agent toluene 0.1g, competitive inclusion agent ethanol 0.1 g, the solvent is 100mL deionized water.

[0031] The preparation method of the delayed crosslinking gel profile control agent in the present embodiment comprises the following steps:

[0032] (1) Preparation of β-cyclodextrin / phenol inclusion compound: Dissolve β-cyclodextrin in deionized water at room temperature, the mass concentration of β-cyclodextrin in the solution is 1.8g / 100mL; dissolve phenol in 75% ethanol solution, then add β-cyclodextrin solution, the concentration of phenol in the solution is 0.15g / 100mL, stir well and let stand for 60min, so that β-cyclodextrin can comp...

Embodiment 2

[0036] The delayed crosslinking gel profile control agent in this example is composed of the following components: partially hydrolyzed polyacrylamide (the molecular weight of HPAM is 2.0×10 7 , degree of hydrolysis is 25%) 0.4g, β-cyclodextrin / phenol inclusion complex 0.6g, urotropine 0.4g, citric acid 0.2g, competitive inclusion agent ethylbenzene 0.1g, competitive inclusion agent entrainer C Alcohol 0.1g, solvent 100mL deionized water.

[0037] The preparation method of the delayed crosslinking gel profile control agent in the present embodiment comprises the following steps:

[0038] (1) Preparation of β-cyclodextrin / phenol clathrate: Dissolve β-cyclodextrin in deionized water at 30°C, the mass concentration of β-cyclodextrin in the solution is 1.8g / 100mL; phenol Dissolve in 70% ethanol solution, then add to β-cyclodextrin solution, the concentration of phenol in the solution is 0.15g / 100mL, stir well and let stand for 45min, so that β-cyclodextrin can completely include ...

Embodiment 3

[0042] The delayed cross-linking gel profile control agent in this example is composed of the following components: partially hydrolyzed polyacrylamide (the molecular weight of HPAM is 1.5×10 7 , degree of hydrolysis is 25%) 0.3g, β-cyclodextrin / phenol inclusion compound 0.5g, urotropine 0.4g, citric acid 0.15g, competing inclusion agent p-xylene 0.1g, competing inclusion agent entrainer Diethyl ether 0.1g, solvent 100mL deionized water.

[0043] The preparation method of the delayed crosslinking gel profile control agent in the present embodiment comprises the following steps:

[0044] (1) Preparation of β-cyclodextrin / phenol inclusion compound: Dissolve β-cyclodextrin in deionized water at 40°C, the mass concentration of β-cyclodextrin in the solution is 1.8g / 100mL; phenol Dissolve in 80% ethanol solution, then add to β-cyclodextrin solution, the concentration of phenol in the solution is 0.15g / 100mL, stir well and let stand for 30min, so that β-cyclodextrin can completely ...

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Abstract

The invention discloses a crosslinking retarding gel profile control agent and a preparation method thereof and belongs to the technical field of oilfield chemistry. The gel profile control agent is prepared from the following ingredients in concentration by mass: 0.1-0.5% of partially hydrolyzed polyacrylamide, 0.1-1.0% of cyclodextrin / phenol inclusion compound, 0.1-0.5% of urotropine, 0.1-0.3% of citric acid, 0.01-0.1% of competitive inclusion agent, 0.01-0.1% of competitive inclusion agent entrainer, wherein water serves as a solvent. According to the crosslinking retarding gel profile control agent and the preparation method thereof, the competitive inclusion agent is dissolved into the competitive inclusion agent entrainer, is dispersed into a retarded crosslinking system and carries out competitive inclusion on phenol, and the release speed of phenol is regulated and controlled through regulating and controlling an inclusion constant of the competitive inclusion agent and cyclodextrin and the mole ratio of the competitive inclusion agent to phenol, so that the gelling time of the gel profile control agent is retarded, and high-permeability oil reservoirs, large drill ways, cracks and the like are subjected to deep profile control selectively.

Description

technical field [0001] The invention specifically relates to a delayed cross-linking gel profile control agent and a preparation method of the profile control agent, belonging to the technical field of oil field chemistry. Background technique [0002] In the profile control technology of oil and water wells at home and abroad, the polymer cross-linking gel technology is generally concerned, that is, the polymer solution and the cross-linking agent are mixed on the ground to prepare a single-liquid profile control working fluid and injected into the deep formation in a large dose. Under certain conditions, the polymer and the cross-linking agent are slowly cross-linked to form a polymer gel with a network structure, so as to block the high-permeability and high-permeability layers and large pores. [0003] The main components of gel profile control system are polymer and crosslinking agent. The commonly used polymers are xanthan gum and polyacrylamide. Xanthan gum has high...

Claims

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Application Information

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IPC IPC(8): C09K8/44C09K8/588C08G81/02C08F120/56C08F8/00C08G8/10
CPCC08G8/10C08G81/024C09K8/512
Inventor 徐斌杨欢张永刚魏开鹏斯容刘学全卢榆林刘岳龙
Owner CHINA PETROLEUM & CHEM CORP
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