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Fracturing fluid and application thereof

A fracturing fluid and content technology, applied in the field of fracturing fluid, can solve the problems of low safety factor, harmful to human body, and unsatisfactory high-temperature shear resistance of cross-linked acid, so as to improve the cross-linking density and cross-linking strength. The effect of improving temperature resistance and shear resistance, and good long-term shear performance

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid liquid gel for acid fracturing of the present invention is used for acid fracturing in oilfields at 70-120°C, but cannot withstand higher temperatures; and the organic crosslinking agent in its formula has certain toxicity, which is harmful to human body and safe for production. The coefficient is not high
A fracturing fluid is disclosed in CN102352235A, which comprises water, hydrochloric acid, CJ2-10 acid thickener, JL-10 crosslinking agent and corrosion inhibitor, but its high temperature shear performance is not high and cannot be used at high temperature
[0005] At present, the fracturing fluids provided in the prior art have unsatisfactory high-temperature shear resistance of the cross-linked acid, which limits its application in high-temperature carbonate rock acid fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the synthesis of organic titanium zirconium crosslinking agent

[0021] Zirconium oxychloride (ZrOCl 2 ) 10.0g dissolved in 20.0g distilled water, stirred until completely dissolved, poured into a three-necked reaction flask equipped with a reflux condensing device, then added 5.0g glycerol and 1.0g mannitol, heated to 40±1°C, and reacted for 2.5 After 1 hour, add 5.0 g of titanium isopropoxide, continue to heat up to 70±1° C., and react for 1.5 hours to prepare an organic titanium-zirconium crosslinking agent.

Embodiment 2

[0024] The cross-linked acid acidified fracturing fluid has the following components in terms of mass percentage: 55.6% concentrated hydrochloric acid with a concentration of 37% (equivalent to 20% pure acid), polyacrylamide polymer (ie thickener, its molecular weight is 500-800 Wan, the molar ratio of AM and AMPS is 7:3) 1.2%, crosslinking agent (i.e. organic zirconium titanium compound in Example 1) 2.0%, corrosion inhibitor (heptadecenylamine ethyl imidazoline quaternary ammonium salt ) 2.0%, and the rest is water. The fracturing fluid was prepared as follows (parts by mass): 39.2 parts of water, 55.6 parts of concentrated hydrochloric acid and 1.2 parts of thickener were added in sequence, and after stirring evenly, 2.0 parts of organic crosslinking agent and 2.0 parts of corrosion inhibitor were added.

[0025] The cross-linked acid acidified fracturing fluid of this embodiment is at 150°C for 170s -1 After shearing for 2 hours, the viscosity is 74mPa·s.

Embodiment 3

[0027] As described in Example 2, the difference is that the mass percent of the thickener is 1.0%.

[0028] The cross-linked acid acidified fracturing fluid of this embodiment is at 150°C for 170s -1 After shearing for 2 hours, the viscosity is 52mPa·s.

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Abstract

The invention discloses a fracturing fluid which comprises hydrochloric acid, a polyacrylamide polymer, an organic titanium-zirconium crosslinking agent, a corrosion inhibitor and water. The fracturing fluid provided by the invention has excellent high-temperature shear resistance, is capable of providing powerful technical support to the acid fracturing transformation of high-temperature deep-well carbonate reservoirs of oil fields, and has a wide application prospect in the development of oil and gas resources in the low-permeability carbonate reservoirs.

Description

technical field [0001] The invention relates to the technical field of oilfield reservoir transformation, in particular to a fracturing fluid. Background technique [0002] Acid fracturing is the main technological measure for increasing production and injection in carbonate formations. It refers to high pressure injection of acid liquid under the condition that the bottom hole pressure is greater than the fracture pressure of the formation to crush the formation, thereby forming artificial fractures, so that the injected acid liquid is It flows in the open fractures and reacts with the rocks on the fracture walls, eventually forming acid-etched fractures with a certain length. After the acid fracturing is completed, the fractures are not completely closed, thereby improving the conductivity of the formation and realizing single-well stimulation. the goal of. [0003] The properties of acidizing working fluid and acid additives directly affect the effect of acidizing fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74E21B43/27
Inventor 赵晓魏娟明祁尚义眭世元李秀云张超王立杨国维玉屈文松唐育迪杨龙杰许洋蔡英杰
Owner CHINA PETROLEUM & CHEM CORP
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