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Oil well anti-swelling fracturing fluid and preparation method thereof

A fracturing fluid and anti-swelling technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as high viscosity and large adsorption capacity on the rock surface, reduce hydration swelling, prevent hydration swelling, Good water washout effect

Active Publication Date: 2017-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the viscosity is higher, the price is more expensive, and the adsorption capacity on the rock surface is larger

Method used

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Examples

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Effect test

preparation example Construction

[0034] The preparation method of the above-mentioned oil well anti-swelling fracturing fluid comprises the following steps,

[0035] (1) Preparation of base liquid

[0036] Adjust the flow rate of the circulating pump to 500-700L / min, add thickener to the water according to the formula ratio, and circulate for 10-15min, then add anti-swelling agent, bactericide, and regulator according to the formula ratio, and finally add drainage aid, and circulate 15-20min, let it stand for 1h, make the vegetable gum thickener fully swell and form a uniform liquid.

[0037] (2) Preparation of cross-linking solution

[0038] The ammonium persulfate and the cross-linking agent are mixed and reacted according to the formula ratio to form a uniform solution.

[0039] (3) Preparation of fracturing fluid

[0040] Under the condition of stirring or pump truck circulation, the fracturing fluid base fluid and cross-linking liquid are mixed evenly according to the formula ratio to form a cross-lin...

Embodiment 1

[0044] Preparation of base liquid: Inject 29,751Kg of water into a 30m³ container, circulate it with a pump truck at a speed of 500L / min, slowly add 60Kg of vegetable gum thickener CJ2-8, and the addition time is not less than 3min, and continue to circulate or stir for 10 minutes. Add 90Kg of high-efficiency anti-swelling agent XYYFP-3, 30Kg of fungicide CJSJ-3, 150Kg of drainage aid CF-5D, and 24Kg of regulator CJ-3 in sequence, and continue to circulate for 15-20min to fully disperse and swell the thickener to form The uniform liquid is the fracturing fluid base fluid. At this time, the mass percentages of vegetable gel thickener, anti-swelling additive, bactericide, regulator, drainage aid and water are: 0.20%, 0.3%, 0.1%, 0.08%, 0.5%, and 98.82%.

[0045] Preparation of cross-linking liquid: Add 2974.5Kg water into a 3m³ container on site, add 15Kg borax and 10.5Kg ammonium persulfate under stirring conditions, and continue stirring for 30 minutes to fully diffuse and swe...

Embodiment 2

[0049] Preparation of base liquid: Inject 29310Kg of water into a 30m³ container, circulate with a pump truck at a speed of 700L / min, slowly add 120Kg of plant gum thickener CJ2-8, and the adding time is not less than 3min, and continue to circulate or stir for 10 minutes. Add 90Kg of high-efficiency anti-swelling agent XYYFP-3, 30Kg of fungicide CJSJ-3, 150Kg of drainage aid CF-5D, and 150Kg of regulator TJ-1, and continue to circulate for 15-20 minutes to fully disperse and swell the thickener to form Uniform liquid, that is, the fracturing fluid base fluid, the mass percentages of vegetable gel thickener, anti-swelling additive, bactericide, regulator, drainage aid and water are: 0.4%, 0.3%, 0.1%, 0.5% , 0.5% and 98.2%.

[0050] Preparation of cross-linking solution: Add 1925Kg organoboron cross-linking agent JL-13 into a 2m³ container on site, add 75Kg ammonium persulfate under stirring conditions, and continue stirring for 40 minutes to fully diffuse and swell each componen...

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Abstract

The invention belongs to the technical field of oil-gas field development and particularly relates to an oil well anti-swelling fracturing fluid and a preparation method thereof. The oil well anti-swelling fracturing fluid comprises base fluid and crosslinked fluid, wherein the base fluid is composed of water, a vegetable gum thickening agent, an anti-swelling additive, a bactericide, a conditioning agent and a discharge aiding agent; the crosslinked fluid is composed of water and a crosslinking agent; by using special properties such as charge density, surface adsorption and the like of the efficient anti-swelling fracturing fluid, the water base fracturing fluid is prepared. The cation of an anti-swelling agent acts on the surface of a clay crystal layer to form a good adsorption layer, so that clay minerals can be well separated from external fluid effectively, therefore, the hydrating swelling and transport of the clay minerals are restrained, the hole throat of an oil layer is protected, water-sensitive damage of an external working solution to the oil layer is reduced, and the anti-swelling fracturing fluid has important significance on improving oil layer and increasing and stabilizing yield in the later period.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an oil well anti-swelling fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing technology is known as one of the methods that can effectively enhance oil recovery. Among the many problems faced by fracturing technology, the effect of clay stabilizer is a factor that will directly affect the recovery factor. [0003] The purpose of oil layer hydraulic fracturing technology is to expand the formation rock pore throat, reduce water injection resistance and improve oil and gas recovery. However, if the clay in the rock pore throats in the formation swells or migrates due to water sensitivity, the rock pore throats will be blocked again, the injection pressure will increase, and the recovery rate will decrease, so the purpose of fracturing will not be achieved . Of course, the application of clay stabilizers i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/665C09K8/68C09K8/685C09K8/887C09K2208/12C09K2208/24C09K2208/26
Inventor 廖乐军孙虎王祖文陈亚联韩文哲郭伟林高红平赵文钢齐加德李婧高燕李楠陈炜白锋军程晓宁
Owner BC P INC CHINA NAT PETROLEUM CORP
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