Slick-water fracturing fluid with high imbibition efficiency and preparation method

A technology of imbibition efficiency and water fracturing, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low imbibition efficiency, achieve the goal of replenishing formation energy, changing wettability, and increasing oil well production Effect

Inactive Publication Date: 2018-10-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing problem of low imbibition efficiency, the present invention provides a slick water fracturing fluid with high imbibition efficiency. Nanoparticles change the wettability of the reservoir, so that driven by capillary force, the slick water fracturing fluid entering the well can spontaneously imbibe into the fine pores of the matrix rock after breaking the gel, and gradually collect the crude oil into the micropores of the matrix rock by oil-water displacement. Large pores and fracturing main fractures, so as to achieve the dual purpose of replenishing formation energy and increasing oil well production

Method used

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Embodiment 1

[0023] In order to overcome the existing problem of low imbibition efficiency, the present invention provides a slick water fracturing fluid with high imbibition efficiency. Nanoparticles change the wettability of the reservoir, so that driven by capillary force, the slick water fracturing fluid entering the well can spontaneously imbibe into the fine pores of the matrix rock after breaking the gel, and gradually collect the crude oil into the micropores of the matrix rock by oil-water displacement. In the large pores and main fractures of fracturing, the dual purpose of replenishing formation energy and increasing oil well production is achieved.

[0024] A slick water fracturing fluid with high imbibition efficiency, the components of the slick water fracturing fluid are as follows by weight percentage:

[0025] Slick water drag reducer: 0.08~0.1%;

[0026] Surfactant: 0.3-0.5%;

[0027] Hydrophilic nanoparticles: 0.1-0.3%;

[0028] Clay stabilizer: 0.3-0.5%;

[0029] Th...

Embodiment 2

[0033] Based on the foregoing embodiments, in this embodiment,

[0034] The slick water drag reducer is one of anionic polyacrylamide and nonionic polyacrylamide, its molecular weight is greater than or equal to 8 million, and its product form can be dry powder, water-in-oil emulsion or water-in-water emulsion.

[0035] The surfactant is sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium secondary alkyl sulfonate, sodium dioctyl succinate sulfonate, sodium lauroyl sarcosinate, N-deca One or more of sodium dialkyl-β-alanine and sodium N-dodecyl-β-aminomethylpropionate.

[0036] The hydrophilic nanoparticles are one or more of hydrophilic silicon dioxide, magnesium oxide, zinc oxide, and titanium oxide with an average particle diameter of less than 100 nm.

[0037] The clay stabilizer is one or a mixture of choline chloride and amphoteric polyamine salt.

[0038] A method for preparing a slickwater fracturing fluid with high imbibition efficiency, the specific ...

Embodiment 3

[0041] Based on the above embodiments, in this embodiment, a slick water fracturing fluid with high imbibition efficiency, the components of the slick water fracturing fluid are as follows by weight percentage:

[0042] Slick water drag reducer: 0.08;

[0043] Surfactant: 0.3%;

[0044] Hydrophilic nanoparticles: 0.1%;

[0045] Clay stabilizer: 0.3%;

[0046] The rest is water.

[0047] Add water, slick water drag reducer, surfactant, hydrophilic nanoparticles and clay stabilizer in proportion to the container in sequence. When adding the above reagents, each reagent needs to be stirred evenly in the container, and the final water quality The viscosity is 4.9 mPa.s.

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Abstract

The invention provides a slick-water fracturing fluid with high imbibition efficiency. The slick-water fracturing fluid comprises the following components in percentages by weight: 0.08 to 0.1% of a slick-water drag-reducing agent, 0.3 to 0.5% of a surfactant, 0.1 to 0.3% of hydrophilic nanoparticles and 0.3 to 0.5% of a clay stabilizer, with the balance being water. According to the invention, the surfactant and the hydrophilic nanoparticles are utilized to change wetting performance of a reservoir, so the slick-water fracturing fluid entering a well can enter fine pore channels of matrix rock through spontaneous imbibition after breaking of a gel under the driving of capillary force; and crude oil is gradually collected into large pore channels and main fractured fractures through oil-water displacement, so the dual purposes of supplementing stratum energy and improving the yield of an oil well are realized. The slick-water fracturing fluid provided by the invention can increase theimbibition efficiency of a gel breaking fluid of the slick-water fracturing fluid, thereby finally improving recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of oil field exploitation chemicals, and in particular relates to a slick water fracturing fluid with high imbibition efficiency and a preparation method. Background technique [0002] In the development process of oil reservoirs, imbibition displacement recovery technology has become an important research direction for refined development of oil reservoirs, increasing single well production, and prolonging the effective period of production. The wetting of the reservoir can be changed by adding surfactants into the well fluid. Driven by the capillary force, the fluid entering the well can spontaneously infiltrate into the fine pores of the matrix rock, and gradually collect the crude oil into the large pores through oil-water displacement, thereby realizing the replenishment of formation energy and improving the ultimate recovery. Purpose. [0003] Reservoir wettability is the basis of imbibition displacem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/66C09K8/68C09K8/84C09K8/88
CPCC09K8/602C09K8/665C09K8/68C09K8/845C09K8/882C09K2208/10
Inventor 刘锦薛小佳唐梅荣李楷吴江郭钢范华波周晓群张同伍白晓虎王建麾王蓓
Owner PETROCHINA CO LTD
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