Oil displacement type fracturing fluid system and preparation method thereof

A fracturing fluid and oil displacement technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting oil field production, low flowback rate, and high output, and achieves easy on-site rapid preparation, on-site The effect of safe construction and simple preparation method

Inactive Publication Date: 2021-06-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fracturing development is the main development method for low-permeability oil and gas fields. However, after fracturing is completed, the flowback of fracturing fluid will directly affect the recovery of the oilfield in the later stage. The flowback data after pressure in low-permeability reservoirs shows that fracturing Oil wells with a flowback rate of less than 20% have relatively high production after production, and wells with a flowback rate of more than 60% have relatively low production after pressure

Method used

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  • Oil displacement type fracturing fluid system and preparation method thereof
  • Oil displacement type fracturing fluid system and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] The oil displacement fracturing fluid system of the present embodiment is composed of the following components in terms of mass percentage:

[0042] Guar gum (CJ2-6) 0.25%; ultra-low interfacial tension surfactant (EOS-3) 0.5%; potassium chloride (KCl) 1.0%; bactericide (CJSJ-3) 0.5%; the balance is water.

[0043] The preparation method of ultra-low interfacial tension surfactant (EOS-3): mix alkanolamide, sodium dodecylsulfonate and sulfobetaine according to the mass ratio of 2:1:1.6, the mass of the mixture Percentage is 40%, all the other are water, stir then, obtain ultra-low interfacial tension surfactant (EOS-3), its oil-water interfacial tension reaches 1.2 * 10 -3 mN / m.

[0044] The preparation method of the oil displacement type fracturing fluid system in this embodiment 1: according to the above mass percentage, take guar gum, ultra-low interfacial tension surfactant (EOS-3), potassium chloride (KCl), bactericide (CJSJ-3 ) and the remaining amount of water ...

Embodiment 2

[0047] The oil displacement fracturing fluid system of the present embodiment is composed of the following components in terms of mass percentage:

[0048] Guar gum (CJ2-6) 0.25%; ultra-low interface surfactant (EOS-3) 0.5%; potassium chloride (KCl) 3.0%; bactericide (CJSJ-3) 0.5%; the balance is water.

[0049] The preparation method of ultra-low interfacial tension surfactant (EOS-3): mix alkanolamide, sodium dodecylsulfonate and sulfobetaine according to the mass ratio of 2:1:1.6, the mass of the mixture Percentage is 40%, all the other are water, stir then, obtain ultra-low interfacial tension surfactant (EOS-3), its oil-water interfacial tension reaches 1.2 * 10 -3 mN / m.

[0050] The preparation method of the present embodiment 2 oil displacement type fracturing fluid system: according to the above mass percentage, take guar gum, ultra-low interfacial tension surfactant (EOS-3), potassium chloride (KCl), bactericide (CJSJ-3 ) and the remaining amount of water are mixed ...

Embodiment 3

[0053] The oil displacement fracturing fluid system of the present embodiment is composed of the following components in terms of mass percentage:

[0054] Guar gum (CJ2-6) 0.25%; ultra-low interfacial tension surfactant (EOS-3) 0.8%; potassium chloride (KCl) 1.8%; bactericide (CJSJ-3) 0.1%; the balance is water.

[0055] The preparation method of ultra-low interfacial tension surfactant (EOS-3): mix alkanolamide, sodium dodecylsulfonate and sulfobetaine according to the mass ratio of 2:1:1.6, the mass of the mixture Percentage is 40%, all the other are water, stir then, obtain ultra-low interfacial tension surfactant (EOS-3), its oil-water interfacial tension reaches 1.2 * 10 -3 mN / m.

[0056] The preparation method of the oil displacement type fracturing fluid system in this embodiment 3: according to the above mass percentage, take guar gum, ultra-low interfacial tension surfactant (EOS-3), potassium chloride (KCl), bactericide (CJSJ-3 ) and the remaining amount of water ...

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Abstract

The invention discloses an oil displacement type fracturing fluid system and a preparation method thereof, and belongs to the field of oilfield chemistry. The oil displacement type fracturing fluid system is composed of the following components in percentage by mass: 0.25-0.3% of guanidine gum; 0.5-0.8% of a surfactant with ultralow interfacial tension; 1.0-3.0% of potassium chloride; 0.1-0.5% of a bactericide; and the balance of water. The oil displacement type fracturing fluid system aims at an oil well subjected to water injection development, the oil displacement type fracturing fluid system is diffused into a water displacement channel during repeated transformation, a certain displacement (washing) characteristic is achieved during flow-back, and the oil washing efficiency of a gel breaking fluid of the fracturing fluid during repeated fracturing of an oil reservoir subjected to water displacement development is improved. The preparation method comprises the following steps: mixing the guanidine gum, the surfactant with ultralow interfacial tension, the potassium chloride, the bactericide and the water, and uniformly stirring to obtain the oil displacement type fracturing fluid system. The preparation method is simple, on-site rapid preparation is easy, use is convenient, and on-site construction is safe.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to an oil displacement type fracturing fluid system and a preparation method thereof. Background technique [0002] Conventional water-based fracturing uses complete gel breaking as a means to increase the flowback capacity and reduce the damage of fracturing fluid to the reservoir. The fracturing fluid thickener is mainly guar gum, and after the gel is broken, the drainage aid is used to improve the drainage performance of fracturing and reduce the damage of multiple reservoirs. Chinese Patent Announcement No. CN 102732244B provides a cross-linking agent for fracturing fluid with ultra-low hydroxypropyl guar gum concentration and the fracturing fluid prepared therefrom, which reduces the damage by reducing the amount of thickener in the fracturing fluid. Chinese Patent Announcement No. CN 104119852B provides a fracturing acidification nano-emulsion drainage aid and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/66C09K8/68C09K8/86C09K8/90
CPCC09K8/584C09K8/68C09K8/90C09K8/86C09K8/665
Inventor 吕宝强陆红军卜向前李建山齐银何衡李建辉康博常笃杨立安李转红
Owner PETROCHINA CO LTD
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