Temperature-sensitive hydrogel leak-plugging agent and preparation method and application thereof

A technology of hydrogel and plugging agent, which is applied in the field of temperature-sensitive hydrogel plugging agent and its preparation, and can solve problems such as low pressure bearing capacity, different functions and effectiveness, and great influence on the performance of the plugging agent. , to achieve the effects of preventing repeated leakage, good leakage prevention and plugging, and improved pressure bearing

Active Publication Date: 2019-08-30
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer lost circulation plugging agent itself also has certain disadvantages: on the one hand, the strength of the plugging agent is not high, the pressure bearing capacity is low, and it cannot effectively block the malignant leakage channel; Due to the influence of other factors, the performance of the plugging age

Method used

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  • Temperature-sensitive hydrogel leak-plugging agent and preparation method and application thereof
  • Temperature-sensitive hydrogel leak-plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A temperature-sensitive hydrogel plugging agent, consisting of the following raw materials in parts by weight:

[0026] Natural starch: 4 parts potato starch,

[0027] Non-ionic monomer: 6 parts of acrylamide, 2 parts of N-isopropylacrylamide,

[0028] Anionic monomer: 2 parts of 2-acrylamido-2-methylpropanesulfonic acid,

[0029] Crosslinking agent: 0.08 parts of N,N-methylenebisacrylamide,

[0030] Initiator: 0.15 parts of ammonium persulfate,

[0031] pH adjuster: 5 parts of sodium hydroxide solution with a mass concentration of 20%,

[0032] Deionized water: 85 parts.

[0033] The preparation method of described thermosensitive hydrogel plugging agent, comprises the following steps:

[0034] (1) Divide 85 parts of deionized water into three parts, namely 70 parts, 5 parts and 10 parts;

[0035] (2) Dissolve natural starch in 70 parts of deionized water, stir at 70°C and 200 rpm for 20 minutes to gelatinize, and obtain pregelatinized starch;

[0036] (3) Add t...

Embodiment 2

[0040] A temperature-sensitive hydrogel plugging agent, consisting of the following raw materials in parts by weight:

[0041] Natural starch: 8 parts tapioca starch,

[0042] Non-ionic monomer: 6 parts of N-vinylpyrrolidone, 2 parts of N-isopropylacrylamide,

[0043] Anionic monomer: 3 parts of acrylic acid,

[0044] Cross-linking agent: 0.1 part of N,N-methylenebisacrylamide,

[0045] Initiator: 0.3 parts of potassium persulfate,

[0046] pH adjuster: 6 parts of sodium hydroxide solution with a mass concentration of 20%,

[0047] Deionized water: 85 parts.

[0048] The preparation method of described thermosensitive hydrogel plugging agent, comprises the following steps:

[0049] (1) Divide 85 parts of deionized water into three parts, namely 70 parts, 5 parts and 10 parts;

[0050] (2) Dissolve natural starch in 70 parts of deionized water, stir at 80°C and 200 rpm for 50 minutes for gelatinization, and obtain pregelatinized starch;

[0051] (3) Add the initiator to ...

Embodiment 3

[0055] A temperature-sensitive hydrogel plugging agent, consisting of the following raw materials in parts by weight:

[0056] Natural starch: 3 parts glutinous rice starch,

[0057] Non-ionic monomer: 5 parts of acrylamide,

[0058] Anionic monomer: 1 part of acrylic acid,

[0059] Cross-linking agent: 0.06 parts of N,N-methylenebisacrylamide,

[0060] Initiator: 0.1 parts of sodium bisulfite,

[0061] pH regulator: 8 parts of sodium hydroxide solution with a mass concentration of 20%,

[0062] Deionized water: 85 parts.

[0063] The preparation method of described thermosensitive hydrogel plugging agent, comprises the following steps:

[0064] (1) Divide 85 parts of deionized water into three parts, namely 70 parts, 5 parts and 10 parts;

[0065] (2) Dissolve natural starch in 70 parts of deionized water, stir at 90°C and 200 rpm for 30 minutes for gelatinization, and obtain pregelatinized starch;

[0066] (3) Add the initiator to 5 parts of deionized water, cool the ...

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Abstract

The invention discloses a temperature-sensitive hydrogel leak-plugging agent. The leak-plugging agent is composed of the following raw materials in parts by weight: 3-8 parts of natural starch, 5-10 parts of a nonionic monomer, 1-3 parts of an anionic monomer, 0.06-0.10 part of a cross-linking agent, 0.1-0.3 part of an initiator, 4-8 parts of a pH adjuster, and 85 parts of deionized water. Meanwhile, the invention also discloses a preparation method of the leak-plugging agent and a leak-plugging application of the leak-plugging agent in leakage formations. The provided temperature-sensitive hydrogel leak-plugging agent can be subjected to a reaction in response to temperature to realize phase transformation, the leak-plugging agent is a flowable liquid before being injected into a formation, and after the leak-plugging agent is injected into a formation of 60-150 DEG C, the formation has a certain temperature, the leak-plugging agent is subjected to a reaction to becomes a solid leak-plugging agent with strong adhesion and elastic characteristics when reaching a bottom temperature, the effective plugging of a leakage channel is realized, and the bearing pressure is relatively high,a pressure of a pore and crack pressure-bearing test can reach 5 MPa or more, and thus the repeated leakage of the formation is prevented.

Description

technical field [0001] The invention belongs to the technical field of oil drilling plugging agents, and in particular relates to a temperature-sensitive hydrogel plugging agent and a preparation method and application thereof. Background technique [0002] Lost circulation is one of the common downhole complex situations in the drilling process. With the deepening of oil and gas exploration and development, the formation conditions encountered become more and more complex. When drilling broken or weakly cemented formations, fractured formations and multiple sets of pressure formations Lost circulation is very easy to occur, which will not only waste drilling time and loss of mud, but also may cause a series of complex situations such as pipe sticking, blowout, well collapse, etc., and even lead to the scrapping of the wellbore, resulting in major economic losses. In recent years, high-performance gel plugging agents have been developed to solve fracture leakage and malignan...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/54C08F220/58C08F222/38C09K8/44
CPCC08F251/00C09K8/426C09K8/44C08F220/56
Inventor 王波李伟张文哲李红梅
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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