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Gel-particle type water plugging agent and preparation method thereof

A technology of gel particles and water blocking agent, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor temperature resistance of common blocking agents, difficult water blocking, etc., and achieves long consolidation time, The effect of easy access to the formation and low cost

Inactive Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, and to solve the problems of difficulty in shutting off water in horizontal wells with precision screens and poor temperature resistance of ordinary plugging agents. After a large number of experiments, screening of various plugging agents and additives, Developed a gel particle water shutoff agent suitable for horizontal wells with precision screens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Gel particle type water blocking agent: 90 kg of G grade cement, 10 kg of HPAM (anionic polyacrylamide), 1 kg of fine silt, 1 kg of calcium carbonate and 500 kg of water.

[0021] Preparation method: According to the above-mentioned addition amount, firstly mix the G-grade cement and the granular plugging agent evenly, then add the strengthening agent and the curing agent and mix evenly, and finally add water to form the gel granular water blocking agent.

[0022] The gel particle type water blocking agent prepared by this formula has a uniform dispersion time of 20 minutes, a consolidation time of 16 hours, a strength of 2.1 MPa, and a temperature resistance of >180 °C.

Embodiment 2

[0024] Gel particle type water blocking agent: 50 kg of G grade cement, 50 kg of ZT-PAM, 0.5 kg of natural soil, 3 kg of fly ash and 600 kg of water.

[0025] Preparation method: According to the above-mentioned addition amount, firstly mix the G-grade cement and the granular plugging agent evenly, then add the strengthening agent and the curing agent and mix evenly, and finally add water to form the gel granular water blocking agent.

[0026] The gel particle type water blocking agent prepared by this formula has a uniform dispersion time of 30 minutes, a consolidation time of 14 hours, a strength of 2.2 MPa, and a temperature resistance of >180 °C.

Embodiment 3

[0028] Gel particle type water blocking agent: 70 kg of G grade cement, 30 kg of MH-PAM, 3 kg of natural soil, 2 kg of fly ash and 700 kg of water.

[0029] Preparation method: According to the above-mentioned addition amount, firstly mix the G-grade cement and the granular plugging agent evenly, then add the strengthening agent and the curing agent and mix evenly, and finally add water to form the gel granular water blocking agent.

[0030] The gel particle type water blocking agent prepared by this formula has a uniform dispersion time of 25 minutes, a consolidation time of 15 hours, a strength of 2.1 MPa, and a temperature resistance of >180 °C.

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Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to a gel-particle type water plugging agent and a preparation method thereof; the technical scheme of the invention is as follows: the gel-particle type water plugging agent comprises a main material, an addition material and water, the main material comprises by weight 50-90% of G grade cement and 50-10% of a particle plugging agent, the addition material accounting for weight percentage of the main material comprises 0.5%- 3% of an enhancer and 1%-3% of a curing agent, the main material and the addition material are base materials, and the weight ratio of the base materials to water is 1:5-7. In plugging of a horizontal section, gel particles are good in suspension property, good in fluidity, good in sieving property, resistant to high temperature, easy to get into the ground and low in cost, so that the purposes that plugging of a precision screen pipe horizontal well is low in risk, long in validity period and high in plugging success rate can be achieved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to the effective water shutoff of precision screen tube horizontal wells [0002] The gel particle type water shutoff agent and its preparation method can meet the needs of thermal recovery and development of heavy oil. Background technique [0003] As the major oilfields of heavy oil have entered the stage of high-round throughput development, the problem of high water cut in heavy oil horizontal wells has become increasingly prominent. [0004] The development effect is getting worse and worse. At present, only 147 horizontal wells for thermal recovery of Xianhe heavy oil have been opened. Due to factors such as edge and bottom water intrusion, there are currently 79 horizontal wells with a water cut greater than 90%, accounting for 53.7% of the number of wells opened. Seriously restricted our plant's stable production base of heavy oil reservoirs. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/5045C09K8/5083C09K8/516C09K2208/18
Inventor 崔新栋张秀生董丽新胡增国万惠平毕志峰孙凯胡燕郑裕庆刘小亮于辉莉王茜赵华杜锐
Owner CHINA PETROLEUM & CHEM CORP
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