Wetting reversal agent for acidification, preparation method, and construction method thereof in sandstone geothermal reservoir

A wetting inversion and emulsifier technology, which is applied in the field of wetting inversion agent for sandstone geothermal reservoir construction, preparation, and acidification, can solve the problems of hindering water production, achieve low cost, good compatibility, and inhibit retention Effect

Active Publication Date: 2022-05-13
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the "water lock" phenomenon caused by the hydrophilicity of the formation has become an unfavorable factor that hinders water production.
The main contradiction in improving the utilization rate of geothermal energy lies in the water extraction volume and water extraction temperature.

Method used

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  • Wetting reversal agent for acidification, preparation method, and construction method thereof in sandstone geothermal reservoir
  • Wetting reversal agent for acidification, preparation method, and construction method thereof in sandstone geothermal reservoir
  • Wetting reversal agent for acidification, preparation method, and construction method thereof in sandstone geothermal reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A wetting reversal agent, which is prepared by the following steps:

[0050] S1. Add 2.4 mol of sodium dodecylbenzenesulfonate to 600 mL of water, then add 1.2 mol of sodium carbonate, and stir for 30 min at a speed of 500 to 550 r / min to obtain an emulsifier mixture;

[0051] S2. Pump nitrogen at a rate of 0.2 L / min, add 2 mol of monomer A and 1 mol of monomer B to the emulsifier mixture under nitrogen atmosphere, and use a shear emulsification stirrer to make monomer A and monomer B Mix and stir with the emulsifier mixed solution for 15 minutes at a rotating speed of 300r / min to obtain a prefabricated reaction solution;

[0052] Wherein, the chemical structural formula of monomer A is: R 1 for -CH 3 , R 2 for -CH 3 ; The chemical structural formula of monomer B is: n is 1;

[0053] S3. Transfer the prefabricated reaction solution to the reaction container, and pass nitrogen protection at a rate of 0.2L / min, maintain a stirring speed of 300r / min, and raise the...

Embodiment 2

[0057] A wetting reversal agent, which is prepared by the following steps:

[0058] S1. Add 1.2 mol of sodium dodecylbenzenesulfonate and 1.2 mol of Span-60 to 600 mL of water, then add 1.2 mol of sodium carbonate, and stir for 30 minutes at a speed of 500 to 550 r / min to obtain an emulsifier mixture ;

[0059] S2. Pump nitrogen at a rate of 0.2 L / min, add 2 mol of monomer A and 1 mol of monomer B to the emulsifier mixture under nitrogen atmosphere, and use a shear emulsification stirrer to make monomer A and monomer B Mix and stir with the emulsifier mixed solution for 15 minutes at a rotating speed of 200r / min to obtain a prefabricated reaction solution;

[0060] Wherein, the chemical structural formula of monomer A is: R 1 for-C 3 h 7 , R 2 for R 4 for-C 3 h 7 ; The chemical structural formula of monomer B is: n is 2;

[0061] S3. Transfer the prefabricated reaction solution to the reaction container, and pass nitrogen protection at a rate of 0.2L / min, maint...

Embodiment 3

[0065] A wetting reversal agent, which is prepared by the following steps:

[0066] S1. Add 1.8 mol of sodium dodecylbenzenesulfonate and 1.8 mol of Span-80 to 600 mL of water, then add 2.4 mol of sodium bicarbonate, and stir for 30 minutes at a speed of 500 to 550 r / min to obtain emulsification agent mixture;

[0067] S2. Pump nitrogen at a rate of 0.2 L / min, add 2 mol of monomer A and 2 mol of monomer B to the emulsifier mixture under nitrogen atmosphere, and use a shear emulsification stirrer to make monomer A and monomer B Mix and stir with the emulsifier mixed solution for 15 minutes at a rotating speed of 300r / min to obtain a prefabricated reaction solution;

[0068] Wherein, the chemical structural formula of monomer A is: R 1 for-C 2 h 5 , R 2 for R 4 for-C 2 h 5 ; The chemical structural formula of monomer B is: n is 2;

[0069] S3. Transfer the prefabricated reaction solution to the reaction container, and pass nitrogen protection at a rate of 0.2L / mi...

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Abstract

The invention discloses a wetting reversal agent, a preparation method, and a construction method thereof in sandstone geothermal reservoirs. The wetting reversal agent is obtained by copolymerizing monomer A and monomer B, and has a weight-average molecular weight of 1200-3000 g / mol copolymer; Monomer A is: Monomer B is: Monomer A, R 1 for CH 3 、C 2 h 5 、C 3 h 7 or R 2 for CH 3 、C 2 h 5 、C 3 h 7 or R 3 for CH 3 、C 2 h 5 、C 3 h 7 or C 4 h 9 , R 4 for CH 3 、C 2 h 5 or C 3 h 7 In the monomer B, n=1~4; in the copolymer, the molar ratio of the corresponding structural unit of the monomer A to the corresponding structural unit of the monomer B is 1:0.5~2; the copolymer is polymerized by the method of emulsion polymerization, When used, it can be directly added to the acidizing working fluid to carry out acidizing construction on sandstone geothermal reservoirs; the wettability reversal agent can effectively change the wettability of solid surfaces from water wetting to oil wetting, and is compatible with It has good performance and does not affect the reaction or interaction between the acidizing working fluid and the acid-etchable minerals and acid-soluble substances; the preparation method is simple, controllable, low in cost, and the harvesting effect after construction is good.

Description

technical field [0001] The invention relates to the technical field of increasing production of geothermal reservoirs in the exploration and development of geological resources, in particular to a wetting reversal agent for acidification, a preparation method and a construction method thereof in sandstone geothermal reservoirs. Background technique [0002] At present, the rational utilization of geothermal resources has become a key project of the country's long-term planning, and it has been mentioned on the planning agenda of "energy saving and emission reduction", and it is also a key development area for reducing air pollution. Geothermal heat is a source of energy derived from nuclear fission within the Earth. This heat seeps out to the surface, so there is geothermal heat. Geothermal energy is a kind of clean energy and renewable energy, which can be used as clean thermal energy such as power generation and winter heating, and its development prospect is very broad. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/02C08F212/14C09K8/60C09K8/68C09K8/72C09K8/74C09K8/88E21B43/22
CPCC08F226/02C08F212/22C09K8/604C09K8/68C09K8/725C09K8/74E21B43/16
Inventor 徐克彬祝琦王勇孙海林李进仪忠建张伟马广东夏天宝马红星胡春明张敏董庆强甄克力
Owner CNPC BOHAI DRILLING ENG
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