Low-hydrocarbon fracturing fluid cross-linking agent and preparation method thereof

A technology of fracturing fluid and low-carbon hydrocarbons, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., which can solve the problems of unsatisfactory requirements, poor temperature resistance of fracturing fluid, and uncontrollable crosslinking time of fracturing fluid and other problems, to achieve the effect of controllable cross-linking time

Inactive Publication Date: 2016-01-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the above prior art is that the temperature resistance of the fracturing fluid after crosslinking with the crosslinking agent is not good, and cannot meet the requirements of existing high-temperature reservoirs such as shale, and the crosslinking time of the fracturing fluid is uncontrollable

Method used

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  • Low-hydrocarbon fracturing fluid cross-linking agent and preparation method thereof
  • Low-hydrocarbon fracturing fluid cross-linking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Based on the total mass of raw materials participating in the polymerization, the crosslinking agent is synthesized according to the following specific steps:

[0023] 1) Preparation of crosslinking agent: 45g of ferric sulfate, 23g of ethylene glycol, 5g of dioctadecyldimethylammonium chloride, 23g of nitrilotriacetic acid, and 4g of sodium acetate were placed in a three-necked bottle.

[0024] 2) Adjust the temperature of the water bath to 55 degrees Celsius, turn on the stirrer, and set the stirring speed to 200 r / min.

[0025] 3) Reaction: The reaction was stopped for 6.5 hours under the condition of nitrogen (that is, nitrogen with a purity of 99.99%).

[0026] Take 0.5% of the reaction cross-linking agent and dialkyl phosphate with an addition of 0.5%, and add it into the propane liquid to cross-link to obtain a cross-linked gel. The cross-linking time is 60s. After cross-linking, the gel has good elasticity and can hang up. A MARS rheometer was used to test the...

Embodiment 2

[0028] Based on the total mass of raw materials participating in the polymerization, the crosslinking agent is synthesized according to the following specific steps:

[0029] 1) Preparation of crosslinking agent: 46g of ferric nitrate, 23g of glycerol, 5g of dibehenyldimethylammonium chloride, 23g of EDTA, and 3g of sodium acetate were placed in a three-necked bottle.

[0030] 2) Adjust the temperature of the water bath to 55 degrees Celsius, turn on the stirrer, and stir at a speed of 200 r / min.

[0031] 3) Reaction: The reaction was stopped for 6.5 hours under the condition of nitrogen (that is, nitrogen with a purity of 99.99%).

[0032] Take 0.45% of reactive cross-linking agent and 0.5% of dialkyl phosphate, add it into butane liquid to cross-link to obtain cross-linked jelly, cross-linking time is 180s, after cross-linking, the jelly has better elasticity Adjustable hanging. A MARS rheometer was used to test the temperature and shear resistance of the jelly. The resul...

Embodiment 3

[0034] Based on the total mass of raw materials participating in the polymerization, the crosslinking agent is synthesized according to the following specific steps:

[0035] 1) Preparation of cross-linking agent: 42g of ferric chloride, 20g of glycerol, 5g of uncodecyltrimethylammonium chloride, 30g of HEDP, and 3g of sodium acetate were placed in a three-necked bottle.

[0036] 2) Adjust the temperature of the water bath to 60 degrees Celsius, turn on the stirrer, and the stirring speed is 200 r / min.

[0037] 3) Reaction: The reaction was stopped for 6.5 hours under the condition of nitrogen (that is, nitrogen with a purity of 99.99%).

[0038] Take 0.45% of the reactive crosslinking agent and 0.5% of the dialkyl phosphate, and add it into the pentane liquid for crosslinking to obtain a crosslinked jelly. The crosslinking time is 90s. After crosslinking, the jelly has good elasticity. Adjustable hanging. A MARS rheometer was used to test the temperature and shear resistanc...

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Abstract

The invention discloses a low-hydrocarbon fracturing fluid cross-linking agent and a preparation method thereof. The cross-linking agent is prepared from, by weight, 40%-50% of ferric iron, 15%-25% of alcohol, 1%-5% of alkyl quaternary ammonium salt, 20%-35% of complexing agent and 0.5%-1% of modifier. The preparation method of the cross-linking agent includes the following steps that the bath temperature is adjusted to be 50-60 DEG C, and the stirring speed is controlled to be 100-500 r / min; under the condition that refined nitrogen is introduced, the ferric iron and the complexing agent are added first, the alcohol and the alkyl quaternary ammonium salt are added after reacting is conducted for 2 hours, then the modifier is added after reacting is conducted for 3.5 hours, and accordingly the low-hydrocarbon fracturing fluid cross-linking agent is obtained. The cross-linking agent is good in cross-linking effect, the temperature resistance is improved, and cross-linking time can be adjusted according to field needs. The preparation method is reliable in principle and easy and convenient to operate, and market application prospects are broad.

Description

technical field [0001] The invention relates to a low-carbon hydrocarbon fracturing fluid crosslinking agent used in the development process of oil and gas fields and a preparation method thereof, belonging to the field of gas well fracturing reagents. Background technique [0002] Unconventional reservoirs such as shale gas have become hotspots in oil and gas exploration and development. Practice has shown that in the development of unconventional gas wells such as shale gas reservoirs, large-scale, high-displacement volumetric fracturing is required to achieve profitable development. In the Changning-Weiyuan National Shale Gas Demonstration Zone in Sichuan, a horizontal well with a depth of 20,000-30,000m 3 . Construction displacement 10~14m 3 / min. The conventional slick water fracturing fluid system has a large construction scale and a large amount of flowback fluid, and there are environmental risks. Low-carbon hydrocarbon fracturing fluid has good compatibility wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685
Inventor 赵金洲陈鹏飞李勇明毛金成
Owner SOUTHWEST PETROLEUM UNIV
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