High-temperature-resistant high-strength underground cross-linked gel profile control agent as well as preparation method and application thereof

An underground cross-linking and profile-modifying agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the difficulties of injection of traditional polymer jelly and pre-cross-linked particles, poor deep effective plugging ability, sealing Insufficient plugging strength and other problems, to achieve the effect of improving the water absorption profile, prolonging the gelation time, and ensuring the safety of production operations

Active Publication Date: 2020-08-07
大庆市新万通科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006]Aiming at the deficiencies of the existing technology, especially for the development and production of horizontal wells in deep high-temperature reservoirs, the profile control and water shutoff agents used at home and abroad have insufficient plugging strength and effective deep sealing. Due to the poor plugging ability, difficulty in injection of traditional polymer jelly and pre-crosslinked particles, and low sweep efficiency, the present invention provides a high-temperature-resistant and high-strength underground cross-linked jelly profile control agent and its preparation method and application. The profile control agent has good injection performance and sweep performance, which can improve the plugging ability and plugging effect of the plugging agent on the formation

Method used

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  • High-temperature-resistant high-strength underground cross-linked gel profile control agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high-temperature-resistant and high-strength underground cross-linked jelly profile control agent, comprising the following raw materials in mass percentage:

[0030] Acrylamide 5%, 2-acrylamido-2-methylpropanesulfonic acid 0.5%, sodium montmorillonite 2%, N,N-methylene bisacrylamide 0.044%, tert-butyl hydroperoxide 0.06 %, sodium hydroxide 0.3%, and the balance is water.

[0031] The preparation method of the above-mentioned high-temperature-resistant and high-strength underground cross-linked jelly profile control agent includes the following steps:

[0032] Weigh sodium-based montmorillonite and add it to a 250mL beaker filled with water, stir it with a mixer for 7 hours to make it evenly dispersed in water, and then mix acrylamide, 2-acrylamide- 2-Methylpropanesulfonic acid, N, N-methylenebisacrylamide and tert-butyl hydroperoxide aqueous solution prepared in advance with a mass concentration of 2% were sequentially added to the solution, stirred for 20 minutes, ...

Embodiment 2

[0035] A high-temperature-resistant and high-strength underground cross-linked jelly profile control agent, comprising the following raw materials in mass percentage:

[0036] Acrylamide 5%, 2-acrylamido-2-methylpropanesulfonic acid 0.8%, sodium montmorillonite 2%, N,N-methylene bisacrylamide 0.03%, tert-butyl hydroperoxide 0.06% , 0.3% sodium hydroxide, and the balance is water.

[0037] The preparation method of the above-mentioned high-temperature-resistant and high-strength underground cross-linked jelly profile control agent is as described in Example 1.

[0038] The initial viscosity of the high-temperature-resistant and high-strength underground cross-linked jelly profile control agent prepared in this example is 13 Pa·s.

Embodiment 3

[0040] A high-temperature-resistant and high-strength underground cross-linked jelly profile control agent, comprising the following raw materials in mass percentage:

[0041] Acrylamide 6%, 2-acrylamido-2-methylpropanesulfonic acid 0.5%, sodium montmorillonite 2%, N,N-methylene bisacrylamide 0.044%, tert-butyl hydroperoxide 0.06% , 0.3% sodium hydroxide, and the balance is water.

[0042] The preparation method of the above-mentioned high-temperature-resistant and high-strength underground cross-linked jelly profile control agent is as described in Example 1.

[0043] The initial viscosity of the high-temperature-resistant and high-strength underground cross-linked jelly profile control agent prepared in this example is 14 Pa·s.

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Abstract

The invention provides a high-temperature-resistant high-strength underground cross-linked gel profile control agent. The profile control agent is prepared from the following raw materials in percentage by mass: 3 to 8 percent of acrylamide, 0.1 to 1.0 percent of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 5 percent of Na-montmorillonite, 0.01 to 0.1 percent of cross-linking agent, 0.01 to 0.1percent of initiator, 0.1 to 0.5 percent of pH regulator and the balance of water. The underground cross-linked gel profile control agent has good injection performance and sweep performance, can improve the plugging capacity and plugging effect of the plugging agent on strata, has the advantages of simple preparation process and good injection performance, and can be used for deep plugging of high-temperature oil reservoirs.

Description

technical field [0001] The invention relates to a high-temperature-resistant and high-strength underground cross-linked jelly profile control agent and a preparation method and application thereof, belonging to the technical field of oil and gas field development. Background technique [0002] At present, most oil fields have entered the high water-cut and ultra-high water-cut development period. The heterogeneity of the reservoir and the long-term water injection development lead to further aggravation of the heterogeneity, and the low-efficiency and ineffective circulation of the injected water in the high-permeability channel , which seriously affects the water flooding development effect. As an important technical means to improve the development effect of water flooding and realize stable production of reservoirs, profile control and water shutoff have been successfully applied in high water-cut oilfields at home and abroad. [0003] At present, the profile control and...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F2/44C08F4/34C09K8/512C09K8/508C09K8/516
CPCC08F220/56C08F2/44C08F4/34C09K8/512C09K8/5083C09K8/516C08F220/585C08F222/385
Inventor 吴凤祥
Owner 大庆市新万通科技开发有限公司
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