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Modified CO2 dry fracturing fluid for shale gas reservoir fracturing transformation, and preparation and evaluation methods thereof

A technology for dry fracturing fluid and shale gas reservoir, which is applied in the field of improving CO2 dry fracturing fluid and its preparation and evaluation, and achieves the effects of obvious effect, obvious production increase and less damage to the reservoir.

Inactive Publication Date: 2019-04-09
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the deficiencies of the existing water-based fracturing fluids for shale gas reservoir fracturing transformation, the object of the present invention is to provide a kind of improved CO2 for shale gas reservoir fracturing transformation 2 Dry fracturing fluid and its preparation and evaluation method

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  • Modified CO2 dry fracturing fluid for shale gas reservoir fracturing transformation, and preparation and evaluation methods thereof
  • Modified CO2 dry fracturing fluid for shale gas reservoir fracturing transformation, and preparation and evaluation methods thereof
  • Modified CO2 dry fracturing fluid for shale gas reservoir fracturing transformation, and preparation and evaluation methods thereof

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Embodiment Construction

[0034] The present invention will be specifically introduced below in conjunction with specific embodiments.

[0035] The improved CO used for shale gas reservoir fracturing reconstruction of the present invention 2 Dry fracturing fluid, in terms of mass percentage, its raw materials include: 1.5%-3% surfactant viscosifier, the rest is liquid CO 2 ; Among them, the surfactant tackifier has a head group and two double tail groups, and the head group is a metal ion Co 2+ or Ni 2+ The hydrophilic group formed, the tail group is a fluorinated CO 2 group. Surfactant-type tackifier is made by mixing main agent SF-1 and thickening aid SF-2 at a mass ratio of 1:1, wherein the main agent SF-1 is a fluoroether carboxylate surfactant; Thickening aid SF-2 is a complex metal ion organic salt.

[0036] The improved CO used for shale gas reservoir fracturing reconstruction of the present invention 2 The preparation and testing of dry fracturing fluid uses an indoor high-parameter fract...

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Abstract

The invention belongs to the field of oil field chemical fracturing fluid, and particularly relates to modified CO2 dry fracturing fluid for shale gas reservoir fracturing transformation, and preparation and evaluation methods thereof. The modified CO2 dry fracturing fluid comprises the following raw materials in percent by mass: 1.5 to 3 percent of a surfactant thickening agent, and CO2 for the surplus, wherein the surfactant thickening agent comprises one head group and two double-tail groups; the head group adopts a hydrophilic group comprises metal ion Co2+ or Ni2+; the tail group adopts afluorinated CO2-philic group. Performing fracturing through the modified CO2 dry fracturing fluid does not consume water resource, is small in damage to a reservoir, does not pollute the environment,and ensures that CO2 becomes gaseous state and is rapidly changed from the reservoir after construction is accomplished. Compared with the conventional fracturing technology, the modified CO2 dry fracturing fluid is obvious in shale gas reservoir yield-increasing effect.

Description

technical field [0001] The invention belongs to the field of oilfield chemical fracturing fluids, in particular to an improved CO 2 Dry fracturing fluids and methods for their preparation and evaluation. Background technique [0002] As one of the main unconventional gas reservoirs, the exploration and development of shale gas reservoirs has become a hotspot in the development of global resources. my country's shale gas resources have great potential, wide distribution area, and many layers of development. It has the potential to realize shale gas leapfrog Favorable conditions for development. According to the latest survey and evaluation results of the national shale gas resource potential released by the Ministry of Land and Resources, the geological reserves of shale gas in my country are 134.42×10 12 m 3 , the recoverable resource potential is 25.08×10 12 m 3 The Sichuan Basin and its surrounding areas, the Middle and Lower Yangtze region, the Ordos Basin, the Qaidam...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/16
CPCE21B43/164E21B43/26
Inventor 王树众罗向荣景泽锋
Owner XI AN JIAOTONG UNIV
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