A kind of preparation method of environment-friendly and water-saving fracturing fluid

A fracturing fluid and water-saving technology, applied in the field of fracturing, can solve the problems of wasting road transportation and sewage treatment costs, limited amount of reinjected water, unable to form gel, etc., and achieves good sand-carrying performance and no equipment. Corrosion, gel stabilization effect

Active Publication Date: 2022-05-20
山东滨州昱诚化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above fracturing fluid systems have relatively strict water quality requirements during the preparation process. Generally, local tap water or clean groundwater should be used. Water that does not meet the standards (such as oilfield production fluid reinjection water) will seriously affect the cross-linking performance of the above systems and fail to form. The jelly is not even cross-linked, so it cannot achieve the purpose of carrying sand
As the oilfield enters the tertiary oil recovery stage, the average water content of the oilfield produced fluid has already exceeded 90%, and the separated water has been reinjected, but the amount of reinjected water is limited, and there is still a large amount of water that cannot be reinjected. The current method is to Pulling the water that cannot be reinjected back to the sewage treatment plant for treatment wastes a lot of road transportation and sewage treatment costs (especially the distance from remote oil areas to the sewage treatment plant is hundreds of kilometers or even thousands of kilometers away)

Method used

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  • A kind of preparation method of environment-friendly and water-saving fracturing fluid

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Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides an environmentally friendly and water-saving fracturing fluid, which is composed of acrylamide, hydroxypropyl-β-cyclodextrin, 2-acrylamide-2-methyl Propanesulfonic acid and N-alkylmaleimide multi-polymer copolymer 0.1%, crosslinking agent 0.2%, synergist 0.1%, gel breaker ammonium persulfate 2.0%, balance 50000mg / L ore The degree of crystallization simulates water. Wherein, the composition of the crosslinking agent according to weight percentage is: 10% alkanolamide, 10% betaine, 15% sodium alkylbenzenesulfonate, 20% glycerol, and the balance is water, wherein the alkanolamide is 1:1.5 type coconut oil diethanolamide, betaine is BS18 betaine, sodium alkylbenzene sulfonate is sodium C12 alkylbenzene sulfonate. The composition of the synergist in parts by weight is: 15 parts of cetyltrimethylammonium bromide, 7 parts of fatty acid glyceride, 5 parts of iminodisuccinic acid sodium salt, and 40 parts of methanol. The preparation method of the thic...

Embodiment 2

[0039] This embodiment provides an environmentally friendly and water-saving fracturing fluid, which is composed of acrylamide, hydroxypropyl-β-cyclodextrin, 2-acrylamide-2-methyl Propanesulfonic acid, N-alkylmaleimide multi-component copolymer 0.15%, crosslinking agent 0.1%, synergist 0.05%, gel breaker ammonium persulfate 0.5%, the balance is salinity 100000mg / L salinity simulates water. Wherein, the composition of the crosslinking agent in parts by weight is: 15% alkanolamide, 5% betaine, 10% sodium alkylbenzene sulfonate, 25% mannitol, and the balance is water, wherein the alkanolamide is 1 : Type 1.5 coconut oil diethanolamide, betaine is BS18 betaine, sodium alkylbenzene sulfonate is sodium C18 alkylbenzene sulfonate. The composition of the synergist in parts by weight is: 17 parts of benzalkonium chloride, 5 parts of alkylphenol polyoxyethylene ether, 10 parts of iminodisuccinic acid sodium salt, and 60 parts of methanol. The preparation method of this multi-componen...

Embodiment 3

[0042]This embodiment provides an environmentally friendly and water-saving fracturing fluid, which is composed of acrylamide, hydroxypropyl-β-cyclodextrin, 2-acrylamide-2-methyl Propanesulfonic acid, N-alkylmaleimide multi-polymer copolymer 0.3%, cross-linking agent 0.25%, synergist 0.06%, drainage aid 0.2%, iron ion stabilizer 0.2%, alginate 0.1% , and the balance is Bei 28 flowback fluid. Wherein, the composition of the crosslinking agent in parts by weight is: 12% alkanolamide, 8% betaine, 12% sodium alkylbenzenesulfonate, 30% mannitol, and the balance is water, wherein the alkanolamide is 1 : Type 1.5 coconut oil diethanolamide, betaine is BS18 betaine, sodium alkylbenzene sulfonate is sodium C15 alkylbenzene sulfonate. The composition of the synergist in parts by weight is: 20 parts of octadecyl dimethyl benzyl ammonium chloride, 6 parts of alkyl glucoside, 8 parts of iminodisuccinic acid sodium salt, and 50 parts of methanol. The preparation method of this multi-compo...

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Abstract

The invention relates to a preparation method of an environment-friendly and water-saving fracturing fluid, which comprises: 0.1-0.5 wt% of a thickener, 0.1-1.0 wt% of a cross-linking agent, and 0.05-0.1 wt% of a synergist, based on the total amount of the fracturing fluid % by weight, 0.1-10% by weight of other additives, and the balance is reinjection water, which includes: high salinity brine, sea water, produced water from oil and gas fields, and fracturing flowback fluid from oil and gas fields. The preparation method includes: batching, first mixing the thickener and reinjection water uniformly; adding a cross-linking agent and mixing uniformly; adding a synergist and mixing uniformly; The present invention also provides the application of the above-mentioned fracturing fluid in oil and gas reservoirs for fracturing oil and gas wells in formations. The present invention uses reinjection water to prepare a fracturing fluid system, and the obtained fracturing fluid has the characteristics of stable jelly, temperature resistance, and good sand-carrying performance, and can save a large amount of water resources and the cost of reinjection water treatment.

Description

technical field [0001] The invention relates to the technical field of fracturing, in particular to a method for preparing an environment-friendly and water-saving fracturing fluid. Background technique [0002] Hydraulic fracturing, referred to as fracturing, is an important technical measure for increasing production of oil and gas wells and increasing injection of water injection wells. It uses the surface high-pressure pump group to inject high-viscosity liquid (fracturing fluid) into the well at a displacement that greatly exceeds the absorption capacity of the formation, causing high pressure at the bottom of the well, and exceeding the formation closure stress at the well wall and the tensile strength of the rock. , to break the formation and form fractures, and then continue to inject liquid with proppant into the fracture, so that the fracture continues to extend, and fill the fracture with proppant, and a sufficient length and a certain width will be formed in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/685C09K8/882C09K8/887
Inventor 孙立军
Owner 山东滨州昱诚化工科技有限公司
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