Preparation method of acidically-decomposable high-temperature-resistant gel blocking agent

A plugging agent and high temperature resistance technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult to remove plugs, limited application range, and insufficient high temperature resistance effect, and achieve high temperature resistance. Effect

Inactive Publication Date: 2017-01-25
新疆科瑞石油工程技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The highest service temperature of this special gel is 125°C, and the structure is destroyed in a strong acidic environment to form a "tofu brain-like" substance, but there is no acidification and decomposition, and there is a problem of difficulty in reverse discharge
[0005] To sum up, there are many kinds of gel plugging materials at present, but there are two common problems. The first is that the high temperature resistance effect is not good enough. The agent cannot be applied to formations with high temperature, and its application range is greatly limited; second, like most of the plugging agents, it is not easy to remove plugging, and is not suitable for oil and gas layer plugging

Method used

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  • Preparation method of acidically-decomposable high-temperature-resistant gel blocking agent
  • Preparation method of acidically-decomposable high-temperature-resistant gel blocking agent
  • Preparation method of acidically-decomposable high-temperature-resistant gel blocking agent

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The invention discloses a preparation method of an acidification-decomposable anti-high temperature gel plugging agent, which mainly includes two parts, one is to modify bentonite; the other is to prepare the gel plugging agent.

[0051] The modification method of bentonite is as follows:

[0052] Weigh 1 to 3 parts by weight of sodium hydroxide, 2 to 5 parts by weight of NaOH 2 CO 3 , and the balance is water, which is added to the reaction vessel, and the temperature is raised to 80°C to 90°C under stirring. Weigh 7-12 parts by weight of bentonite and slowly add it into the reaction vessel, keep stirring during the adding process, raise the temperature to 100°C after the addition is completed, and react at 100°C for 4 hours. After the reaction, cool to room temperature, wash and dry the reactant to obtain modified bentonite.

[0053] The preparation method of gel plugging agent is as follows:

[0054] (1) The modified bentonite is formulated into a modified benton...

Embodiment 2

[0078] Change the holding time after raising the temperature to 100°C in the bentonite modification reaction to 3.5 hours; change the water bath heating time in the gel sealing agent preparation reaction to 4.5 hours, and change the drying time to 8.5 hours. Other conditions are the same as the implementation example 1.

Embodiment 3

[0080] Change the holding time after raising the temperature to 100°C in the bentonite modification reaction to 4.5 hours; change the water bath heating time in the gel sealing agent preparation reaction to 5.5 hours, and change the drying time to 9.5 hours. Other conditions are the same as the implementation example 1.

[0081] After comparing the gel plugging agents prepared in the above three examples, it is concluded that the three have the advantages of high temperature resistance, high toughness, and easy acid decomposition compared with other existing gel plugging agents. , and the performance of the gel plugging agent prepared in Example 1 is more prominent among the three.

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Abstract

The invention relates to a preparation method for preparing an acidically-decomposable high-temperature-resistant gel blocking agent by adopting modified bentonite as a raw material. The preparation method comprises two portions, i.e. modification of bentonite and preparation of gel blocking agent. Specifically, the preparation method comprises the following steps: modifying the bentonite by using sodium hydroxide, Na2CO3 and water, mixing the modified bentonite, acrylamide, 2-acrylamide-2-methyl propyl sulfonic acid, non-ion surfactant, a cross-linking agent and an initiator, and performing the reaction under certain conditions, thus obtaining the gel blocking agent. The preparation method has the beneficial effects that the strength, the flexibility and the water-absorption expansion capacity are good, the performance can be maintained in an environment of 150 DEG C, and the gel has an acidic decomposition property that is not possessed by other gel blocking materials. The gel blocking agent can be acidically decomposed both in a hydrochloric acid solution and a hydrofluoric acid solution, the higher the temperature is, the higher the decomposition speed is, and the broken-down performance is good.

Description

technical field [0001] The invention relates to a preparation method for preparing an acidification-decomposable anti-high temperature gel plugging agent by using modified bentonite as a raw material. Background technique [0002] At present, gel plugging agent is widely used in the process of workover or drilling plugging in the petroleum field. Because it is in a special environment, it is required to have good high temperature resistance, high elasticity, high strength, and water absorption. And many other properties such as decomposability. At present, the performance of the gel plugging agent invented at home and abroad has shortcomings, which affects the overall performance and service life. [0003] Such as: Journal (Development and Application of Gel Plugging Agent [J]. Henan Petroleum, 1998, 12(5): 23-26.) discloses the use of konjac flour for modification to form a high viscoelasticity and certain strength gel. Bohai Petroleum Company used the gel plugging agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/56C08K9/02C08K3/34C09K8/46C09K8/512C09K8/516
CPCC08F220/58C08K3/346C08K9/02C09K8/46C09K8/512C09K8/516C08F220/585C08F220/56
Inventor 刘玉霞裴玉彬
Owner 新疆科瑞石油工程技术服务有限公司
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