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Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method

A technology of horizontal lateral wells and temporary plugging agent, which is applied in chemical instruments and methods, sealing/isolation, earth-moving drilling, etc., can solve problems such as unsatisfactory water plugging effect, and achieve the effect of reducing construction risks and costs

Active Publication Date: 2015-10-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the water plugging construction of horizontal branch wells in medium and deep reservoirs, due to the high temperature, the water plugging technology of the above-mentioned horizontal branch wells has some problems in terms of chemical isolation and sealing outside the pipe, mechanical sealing strength inside the pipe, and construction safety. problem, resulting in unsatisfactory water blocking effect

Method used

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  • Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method
  • Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method
  • Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method

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Embodiment 1

[0043] This embodiment provides a chemical isolation temporary plugging agent for horizontal lateral wells in medium-deep oil reservoirs. Base guar gum powder, 2 parts by weight of sodium bentonite, 0.05 parts by weight of N, N-methylenebisacrylamide, 0.06 parts by weight of urotropine, 0.008 parts by weight of resorcinol, 0.05 parts by weight of Tetrabutyl titanate, dimethyl azobisisobutyrate of 0.02 parts by weight, ammonium persulfate of 0.02 parts by weight, sodium lignosulfonate of 0.03 parts by weight, sodium gluconate of 0.02 parts by weight, 0.03 parts by weight of Citric acid, the oxalic acid of 0.03 weight part, the triethanolamine of 0.02 weight part and the water of balance.

[0044] The above-mentioned chemical isolation temporary plugging agent for horizontal lateral wells in medium and deep reservoirs is prepared by the following steps: polyacrylamide, sodium bentonite, hydroxypropyl guar gum powder and deionized water are sequentially added to 10m 3 In the mix...

Embodiment 2

[0046] This embodiment provides a chemical isolation temporary plugging agent for horizontal lateral wells in medium-deep oil reservoirs, which includes: 9 parts by weight of acrylamide, 0.3 parts by weight of polyacrylamide, and 0.7 parts by weight of hydroxypropyl Base guar gum powder, 3 parts by weight of sodium bentonite, 0.05 parts by weight of N, N-methylenebisacrylamide, 0.07 parts by weight of urotropine, 0.008 parts by weight of resorcinol, 0.05 parts by weight of tetrabutyl titanate, 0.03 parts by weight of dimethyl azobisisobutyrate, 0.02 parts by weight of ammonium persulfate, 0.04 parts by weight of sodium lignosulfonate, 0.03 parts by weight of sodium gluconate, 0.03 parts by weight of Citric acid, the oxalic acid of 0.04 parts by weight, the triethanolamine of 0.03 parts by weight and the water of balance.

[0047] The above-mentioned chemical isolation temporary plugging agent for horizontal lateral wells in medium and deep reservoirs is prepared by the followi...

Embodiment 3

[0049] This embodiment provides a chemical isolation temporary plugging agent for horizontal lateral wells in medium-deep oil reservoirs, which includes: 10 parts by weight of acrylamide, 0.4 parts by weight of polyacrylamide, and 0.7 parts by weight of hydroxypropyl Base guar gum powder, 3 parts by weight of sodium bentonite, 0.06 parts by weight of N, N-methylenebisacrylamide, 0.078 parts by weight of urotropine, 0.009 parts by weight of resorcinol, 0.06 parts by weight of Tetrabutyl titanate, dimethyl azobisisobutyrate of 0.03 parts by weight, ammonium persulfate of 0.03 parts by weight, sodium lignosulfonate of 0.05 parts by weight, sodium gluconate of 0.04 parts by weight, 0.03 parts by weight Citric acid, the oxalic acid of 0.05 parts by weight, the triethanolamine of 0.03 parts by weight and the water of balance.

[0050] The above-mentioned chemical isolation temporary plugging agent for horizontal lateral wells in medium and deep reservoirs is prepared by the followin...

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Abstract

The present invention provides a middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and a water plugging method, wherein the middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent comprises 6-12 wt% of acrylamide, 1.5-6.4 wt% of a composite thickeners, 0.126-0.272 wt% of a composite cross-linking agent, 0.01-0.05 wt% of dimethyl 2,2'-azobis(2-methylpropionate), 0.01-0.04 wt% of ammonium persulfate, 0.01-0.08 wt% of sodium lignosulfonate, 0.01-0.05 wt% of sodium gluconate, 0.01-0.05 wt% of citric acid, 0.01-0.06 wt% of ethanedioic acid, 0.01-0.05% of triethanolamine, and the balance of water. The present invention further provides the method using the chemical packing temporary plugging agent to complete the water plugging of the middle-deep stratum oil reservoir horizontal multilateral well. With the chemical packing temporary plugging agent and the water plugging method of the present invention, the multilateral sectional water plugging of the middle-deep stratum oil reservoir screen pipe completion horizontal multilateral well is achieved, and the difficult problem of the screen pipe completion horizontal multilateral well sectional water plugging is solved.

Description

technical field [0001] The invention relates to a temporary plugging agent and a water plugging method, in particular to a chemical sealing temporary plugging agent and a water plugging method for horizontal branch wells in medium and deep oil reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] Horizontal branch well technology is an important technical means to enhance oil recovery and increase crude oil production. Compared with conventional horizontal wells, horizontal branch wells have longer horizontal boreholes, which can maximize the oil drainage area, increase the vertical production degree of oil layers, and improve the oil flow dynamic profile. Horizontal branch wells can achieve more production with fewer wells, and reduce drilling It has received more and more attention and application in oilfield development to reduce costs and improve economic benefits. [0003] Affected by factors such as investment cost and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512E21B33/13
CPCC09K8/512E21B33/13
Inventor 刘强李瑞龙华王浩郑猛马昌明柳荣伟陈小凯安志杰白勐白龙罗鹏飞李宏远
Owner PETROCHINA CO LTD
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