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Protective agent for chlorite membrane on oil reservoir pore surface

A mud-stone membrane and protective agent technology, which is applied in the field of surfactants and chemical treatment agents, can solve the problems of reduced reservoir permeability, reduced oil well production, blocked pore throats, etc., and achieves the effect of protecting the pore surface

Active Publication Date: 2012-07-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the downhole operation is not handled properly, the foreign liquid will expand the layer of chlorite membrane, reduce the permeability of the reservoir, and may further peel off to form particle migration, block the pore throat, and cause oil well production to decline and water well underinjection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Product preparation: Take by weight: tetramethylammonium sulfate, 120kg; tetradecyldimethylbenzyl ammonium chloride, 120kg; mercaptoacetic acid, 60kg; isopropanol, Jiangdu Yulongda Chemical Co., Ltd. Company, 36kg; Ethylene glycol butyl ether, Dow Chemical, 48kg; Propylene glycol, Jiangdu Yulongda Chemical Co., Ltd., 60kg; N, N-dimethylformamide, Baling Branch of China Petroleum & Chemical Corporation , 60kg; fluorinated tetramethyl polyether glycol (code: SR11), Shaanxi Senrui Petroleum Technology Development Co., Ltd., 48kg; 2,3-epoxypropyltrimethylammonium chloride, Shengli Oilfield Longhao Chemical Co., Ltd. Responsible company, 48kg; deionized water, 600kg.

[0034] Add deionized water to the reaction kettle first, and then add in order: 2,3-epoxypropyltrimethylammonium chloride, N,N-dimethylformamide, tetramethyl fluoride Base polyether glycol, ethylene glycol butyl ether, isopropanol, tetramethylammonium sulfate, propylene glycol and mercaptoacetic aci...

Embodiment 2

[0037] Example 2 Product preparation: take by weight: tetramethylammonium sulfate, 330kg; tetradecyldimethylbenzyl ammonium chloride, 300kg; mercaptoacetic acid, 180kg; isopropanol, Jiangdu Yulongda Chemical Co., Ltd. Company, 90kg; Ethylene glycol butyl ether, Dow Chemical, 150kg; Propylene glycol, Jiangdu Yulongda Chemical Co., Ltd., 150kg; N,N-Dimethylformamide, Baling Branch of China Petroleum & Chemical Corporation , 180kg; fluorinated tetramethyl polyether glycol (code: SR11), Shaanxi Senrui Petroleum Technology Development Co., Ltd., 150kg; 2,3-epoxypropyltrimethylammonium chloride, Shengli Oilfield Longhao Chemical Co., Ltd. Responsible company, 150kg; deionized water, 1320kg.

[0038] The above raw materials were prepared according to the preparation process of Example 1. Obtain 3 tons of protective agent products suitable for chlorite film on the reservoir pore surface.

[0039] Example 2 Field experiment and effect: A water injection well (2#) reservoir has fine p...

Embodiment 3

[0041] Embodiment 3 product preparation: with embodiment 2

[0042] Example 1 Field experiment and effect: A water injection well (3#) reservoir has fine pore throats, and the surface of the pores is covered by a layer of chlorite film. Fracturing on April 10, 2010, adding sand 16m 3 , 97m of clean water will be prepared on site after drainage 3 , add the above 3t product through a 700-type cement truck, and circulate uniformly to obtain 100m 3 treatment fluid. First, wash the well with active water, close the casing gate after washing until the water quality of the inlet and outlet is consistent, and pump the above-mentioned treatment solution at a displacement of 180L / min. After the pump injection is completed and the clean water is replaced, the well is shut down for 24 hours and the injection is done directly, and the measures are completed. After the measures, the water injection pressure of the well dropped from 22.9Mpa to 16.7Mpa, and the daily water injection volum...

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PUM

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Abstract

The invention relates to a protective agent for a chlorite membrane on the surface of the pore of a reservoir, which is applied to the pore of the protective reservoir of the oil well and the water injection well of the oilfield. The protective agent comprises the following components in parts by weight: 8-12% of tetramethyl ammonium sulfate, 8-12% of tetradecyl benzyl dimethyl ammonium chloride,5-8% of thioglycolic acid, 2-4% of isopropyl alcohol, 3-6% of ethylene glycol butyl ether, 4-8% of propylene glycol, 5-8% of N, N-dimethylformamide, 3-6% of fluorinated tetramethyl polyether diol, 3-6% of 2,3-epoxypropyl trimethyl ammonium chloride and the balance of deionized water. The total percent of the components is 100 percent. The protective agent can be prepared into a treatment solutionwith clear water and can be infused into the ultralow-permeability reservoir to protect the pore of the reservoir, wherein the surface of the pore of the reservoir is provided with the chlorite membrane.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a chemical treatment agent for downhole oil reservoir protection, which is a surfactant suitable for chlorite film on the pore surface of tight reservoirs in ultra-low permeability oil reservoirs. Background technique [0002] At present, some ultra-low permeability reservoirs in Changqing Oilfield have fine pore throats, and the surface of the pores is covered by a layer of chlorite film. If the downhole operation is not handled properly, the foreign liquid will expand the layer of chlorite membrane, reduce the permeability of the reservoir, and may further peel off to form particle migration, block the pore throat, and cause oil well production to decline and water well underinjection . Contents of the invention [0003] The purpose of the present invention is to provide a protective agent suitable for the chlorite film on the pore surface of the oil reservoir, prevent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/52
Inventor 赵继勇常彦荣陆红军李建山陈宝春顾燕凌王成旺鲁玲曹润荣刘静赵伯平吴甫让李川
Owner PETROCHINA CO LTD
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