Slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation

A technology of interfacial tension and water fracturing, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increased interfacial tension and poor effect, and achieve good anti-swelling performance, obvious drag reduction effect, Complete gel breaking effect

Inactive Publication Date: 2017-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite evaluation of the existing oil displacement surfactant and slick water fracturing fluid shows that the interfacial tension is generally significantly increased, and the effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention discloses a degraded slick water fracturing fluid with ultra-low interfacial tension with crude oil, which is used for the reconstruction of low-permeability oil and gas reservoirs, can reduce the interfacial tension between the gel breaking fluid and crude oil, and reduce pipe strings and construction friction , can greatly improve the effect of oil well stimulation. The slick water fracturing fluid is composed of ultra-low interfacial tension drag reducer, demulsification and drainage aid, clay stabilizer, and degradation agent. The preparation method is to add a mass fraction of 0.02-0.10% ultra-low interfacial tension drag reducer, 0.1-0.2% demulsification aid and 0.3% clay stabilizer, mix to form a uniform solution, and add 0.08% degradation agent from the mixing tank of the sand mixer during construction .

[0030] The additives of this slick water fracturing fluid are all in liquid phase, and the fracturing fluid formed by configuration is an invers...

Embodiment 2

[0032] The technical scheme adopted in the preparation of the interfacial tension drag reducer of the present invention is:

[0033] The first step is to synthesize a high molecular polymer: add a certain amount of emulsifier and solvent oil into the reactor, stir well, and add a certain amount of lipophilic propylene-based monomer to the oil phase, dissolve and disperse evenly to form an oil phase. At the same time, an appropriate amount of hydrophilic propylene-based monomer is fully dissolved in water, and a certain amount of concentrated sodium hydroxide aqueous solution is added to adjust the pH value to 9-11 to form a water phase. At the beginning of the reaction, add the water phase to the oil phase and stir evenly, fully emulsify for 30 minutes, add a small amount of initiator under the condition of nitrogen protection, keep at 30°C, react for 48 hours, and cool down to obtain a reverse emulsion system.

[0034]The second step is to prepare the surfactant system: the p...

Embodiment 3

[0037] On the basis of Example 2, the ultra-low interfacial tension drag reducer is prepared and synthesized by the following steps:

[0038] 1) Mix 7-9 parts by weight of emulsifier with 50-60 parts by weight of mineral spirits to make an oil phase solvent, and add 10-20 parts by weight of lipophilic propylene-based monomer to the oil phase solvent to obtain Oil phase mixed solution;

[0039] 2) adding 12 to 15 parts by weight of a hydrophilic propylene-based monomer to 50 to 60 parts by weight of water, stirring to dissolve, and adjusting the pH value to 9 to 11 to prepare an aqueous phase solution;

[0040] 3) adding the aqueous phase solution prepared in step 2 to the oil phase mixed solution prepared in step 1, and adding 0.15 to 0.22 parts by weight of an initiator under a protective atmosphere to carry out a polymerization reaction to obtain a high molecular polymer; wherein , the mass ratio of the aqueous phase solution to the oil phase mixed solution is 1:2.2;

[00...

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PUM

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Abstract

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, in particular to a slick water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. Background technique [0002] Tight unconventional reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most tight oil and gas wells require reservoir reconstruction to obtain ideal production. At present, the most important production stimulation measure for the development of tight unconventional reservoirs at home and abroad is friction reduction fracturing, that is, using low-friction slick water fracturing fluid for volume stimulation. The slick water fracturing fluid system is a new fracturing fluid system developed for the reconstruction of tight unconventional reservoirs. The slick water system can greatly reduce the friction and pressure of fracturing construction, and reduce the cost of fracturing constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/12
Inventor 郭钢李忠兴慕立俊赵振峰李宪文张矿生薛小佳唐梅荣李楷吴江吕海燕刘锦范华波杜现飞
Owner PETROCHINA CO LTD
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