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Reverse wetting agent for acidification, preparation method thereof, and construction method of reverse wetting agent in sandstone geothermal reservoir

A wetting inversion and emulsifier technology, applied in the field of wetting inversion agent for acidification, construction and preparation of sandstone geothermal reservoirs, can solve problems such as hindering water production, achieve low cost, simple preparation method, and inhibit retention Effect

Active Publication Date: 2021-06-29
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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  • Reverse wetting agent for acidification, preparation method thereof, and construction method of reverse wetting agent in sandstone geothermal reservoir
  • Reverse wetting agent for acidification, preparation method thereof, and construction method of reverse wetting agent in sandstone geothermal reservoir
  • Reverse wetting agent for acidification, preparation method thereof, and construction method of reverse wetting agent 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 at a speed of 500 r / min for 30 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 temperat...

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 at a speed of 520 r / min for 30 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, maintain a stirring...

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 at a speed of 520 r / min for 30 min to obtain an emulsifier mixture liquid;

[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 / min, maintain ...

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Abstract

The invention discloses a reverse wetting agent, a preparation method thereof, and a construction method of the reverse wetting agent in a sandstone geothermal reservoir. The reverse wetting agent is a copolymer which is obtained by copolymerizing a monomer A and a monomer B and has the weight-average molecular weight of 1200-3000 g / mol; the monomer A and the monomer B are both shown in the specification; in the monomer A, R1 is CH3, C2H5 and C3H7, or R2 is CH3, C2H5 and C3H7, or R3 is CH3, C2H5, C3H7 or C4H9, and R4 is CH3, C2H5 or C3H7; in the monomer B, n is equal to 1-4; the molar ratio of the corresponding structural unit of the monomer A to the corresponding structural unit of the monomer B in the copolymer is 1: (0.5-2); the copolymer is polymerized by adopting an emulsion polymerization method, and can be directly added into an acidizing working solution to carry out acidizing construction on a sandstone geothermal reservoir during use; and the reverse wetting agent can effectively convert the wettability of the solid surface from water wetting to oil wetting, is good in compatibility, and does not affect the reaction or interaction between the acidizing working solution and acid-etching minerals and acid-soluble substances; and the preparation method is simple, controllable, low in cost and good in harvesting effect after construction.

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 Applications(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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