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Fracturing fluid drag reducer containing betaine surfactant and its preparation method and application

A surfactant and fracturing fluid technology, applied in the field of fracturing fluid drag reducing agent, can solve the problems of narrow operating temperature range and less addition amount, and achieve the effects of low product cost, guaranteed drag reducing performance, and mature synthesis route

Active Publication Date: 2018-11-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is the problem that the use temperature range of the surfactant drag reducer in the fracturing fluid used to develop shale gas is relatively narrow in the prior art, and a kind of fracturing agent containing betaine surfactant is provided Fracture fluid drag reducer, the fracturing fluid drag reducer contains fatty alcohol polyoxyethylene ether-based di-aliphatic hydrocarbon-based betaine surfactant and anionic amphiphile, which solves this problem well, has a wide temperature range, and can be added The advantage of less

Method used

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  • Fracturing fluid drag reducer containing betaine surfactant and its preparation method and application
  • Fracturing fluid drag reducer containing betaine surfactant and its preparation method and application
  • Fracturing fluid drag reducer containing betaine surfactant and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Add 1000 grams of stearyl polyoxyethylene ether (EO=2.1) and 100 grams of Harshaw’s Cu-203 catalytic amination catalyst into a low-pressure reactor and heat up to 100° C., depressurize to a vacuum of 0.9, and stir for 30 minutes to remove easily Volatile components, then carry out 4 times of nitrogen replacement and 4 times of hydrogen replacement in sequence, adjust the system pressure to 0.02Mpa, feed 1188 g of dimethylamine under pressure with 0.5Mpa nitrogen, raise the temperature to 220°C for 5 hours, and cool down to 160°C °C, the excess dimethylamine was removed under reduced pressure to obtain the intermediate. Dissolve the intermediate in absolute ethanol to prepare a 40% solution, add it into the reaction kettle, add 353 grams of sodium chloroacetate, and react at 90° C. for 5 to 6 hours under normal pressure. Add 5000ml of benzene to the reaction kettle after removing the solvent absolute ethanol by distillation under reduced pressure, and stir to dissolve th...

Embodiment 2

[0046] Add 2 grams of JYPQ (same as Example 1) into 9.985Kg tap water and stir to dissolve, then add 9.77 grams of stearyl polyoxyethylene ether base (EO=2.1) dimethyl betaine and stir for 4 hours, and finally add 5.23 grams of 2- The sodium naphthalenesulfonate was stirred for 6 hours and left overnight to obtain a clear, transparent and air-bubble-free aqueous solution of surfactant drag reducer with a concentration of 0.15% (wt). The test results of the pipe friction meter at 30°C show that the maximum drag reduction rate of the fluid reaches 74%.

Embodiment 3

[0048] Add 9.77 grams of stearyl polyoxyethylene ether (EO=2.1) dimethyl betaine to 9.985 Kg tap water and stir for 4 hours to dissolve, then add 5.23 grams of 2-naphthalenesulfonate and stir for 6 hours, then place it overnight A clear, transparent and bubble-free aqueous solution of surfactant drag reducer with a concentration of 0.15% (wt) was obtained. The test results of the pipe friction meter at 32°C show that the maximum drag reduction rate of the fluid reaches 73%.

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Abstract

The present invention relates to a betaine-surfactant-containing fracturing fluid drag reduction agent and a preparation method and application thereof, and mainly solves the problems of narrow temperature range of a clear water fracturing fluid surfactant drag reduction agent used for development of shale gas in the prior art. The betaine-surfactant-containing fracturing fluid drag reduction agent includes fatty alcohol ethoxylate two aliphatic chain hydrocarbon betaine surfactant and an anionic amphiphilic molecule; the fatty alcohol ethoxylate ethoxylate two aliphatic chain hydrocarbon betaine surfactant has the general formula shown as (I), wherein X is one substance selected from carboxylate and sulfonate, R1 is C12-C22 aliphatic chain hydrocarbon group, R2 and R3 are independently selected from C1-C4 aliphatic hydrocarbon chain groups, R4 is C1-C4 alkylene group, n = 0-10; the molar ratio of the betaine surfactant and the anionic amphiphilic molecule is 1: (0.5 to 2), and by the technical scheme, the problem can be better solved, and the method can be used for the fracturing process of shale gas development.

Description

technical field [0001] The invention relates to a fracturing fluid drag reducer containing a betaine surfactant, a preparation method and application thereof. Background technique [0002] Shale gas will be one of the important sources of fossil energy in the 21st century. With the successful commercial development of shale gas reservoirs in the United States, shale gas resources have received more and more attention. Shale gas reservoirs are low-permeability reservoirs, and their permeability is 2-3 orders of magnitude lower than that of tight clastic gas reservoirs. Fracturing has become an important means of shale gas exploration and development. At present, staged fracturing of large-displacement horizontal wells is the main stimulation technology for shale gas development, and the preparation of high-efficiency water-based drag reducer for clear water fracturing fluid is one of the keys to the success of shale gas fracturing technology. [0003] In the early 1930s, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C07C229/12C07C227/02C07C309/45C07C309/35C07C303/32
Inventor 翟晓东喻德峰张卫东杨一青沙鸥李应成
Owner CHINA PETROLEUM & CHEM CORP