CN101805600B - Gelled fracturing fluid being applicable to coalbed methane reservoir - Google Patents
Gelled fracturing fluid being applicable to coalbed methane reservoir Download PDFInfo
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- CN101805600B CN101805600B CN2010101502399A CN201010150239A CN101805600B CN 101805600 B CN101805600 B CN 101805600B CN 2010101502399 A CN2010101502399 A CN 2010101502399A CN 201010150239 A CN201010150239 A CN 201010150239A CN 101805600 B CN101805600 B CN 101805600B
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Abstract
The invention discloses a gelled fracturing fluid being applicable to coalbed methane reservoir, which consists of 0.3 to 0.5 percent of non-ionic polyacrylamide and 0.014 to 0.04 percent of zirconium oxychloride (ZrOCl12) which are used as cross-linking agent, 0.01 to 0.12 percent of hydrochloric acid which is used as pH adjusting agent, 0.06 to 0.12 percent of gelbreaker and surplus water, wherein the gelbreaker is of a redox system which is formed by ammonium persulfate and sodium sulfite according to the mass ratio of (1.0 to 3.0): 1. With the gelbreaker, the gel can be broken under the low-temperature condition. The gelation time and the gel-breaking time of the gelled fracturing fluid are adjustable. The gelled fracturing fluid has the advantages of fast low-temperature cross-linking sped, large viscosity, low filter loss, thorough breaking, no residual slag of gelled fracturing liquid and easy flowback, and can effectively improve the yield of the coalbed methane.
Description
Technical field:
The present invention relates to a kind of gelled fracturing fluid, as the working fluid of reservoir reconstruction in the cbm development.
Technical background:
Coal-seam gas be a kind of and coal association and with the form of adsorbed state from being conigenous the unconventional Sweet natural gas that is stored in the coal seam.It is different to be in a liquid state composes the oil of depositing, and is different from again mainly to be present in the conventional gas in the stratum with free state.The exploitation of coal-seam gas is the process of depressurization desorption, diffusion and a seepage flow.The waterfrac treatment coal seam be modal also be one of most important completion well stimulation.In the pressing crack construction of coal seam, the quality of fracturing liquid performance is to be related to the success or failure of pressing crack construction and an important factor of influence pressure back effect of increasing production.At present, active water fracturing liquid and plant gum fracturing fluid have obtained using widely in the pressure break of coal seam.The former prepares simply, and is little to the coal seam injury, but receives self rheology impact, and the use scale is restricted; The latter originates extensively, and cost is low, and Applicable temperature is high, but water-insoluble is many, and the breaking glue solution residue content is higher, and is big to coal seam and fracture permeability infringement, influences fracturing effect.
Summary of the invention:
The purpose of this invention is to provide a kind of gelled fracturing fluid that is applicable to coalbed methane reservoir; Through the coal seam fracturing reform, pit shaft is communicated with cracks in coal seam, when the coal-seam gas gas production; The step-down funnel that individual well is formed is wider; The natural fracture in coal seam is connective better, thereby improves the desorption rate of gas, increases the coal-seam gas production capacity.
The objective of the invention is to realize like this: this fracturing liquid is made up of non-ionic polymers, linking agent, pH regulator agent, gel breaker and water, and wherein non-ionic polymers is the non-ionic type SEPIGEL 305, and relative molecular mass is 965 * 10
4, degree of hydrolysis is 3.31%, the massfraction in the fracturing liquid total amount is 0.3%～0.5%; Linking agent is zirconium oxychloride (ZrOCl
2), the massfraction in the fracturing liquid total amount is 0.014%～0.04%, forms the frozen glue with tridimensional network through chemically crosslinked and non-ionic polymers; The pH regulator agent is a hydrochloric acid, and the massfraction in the fracturing liquid total amount is 0.01%～0.12%, system pH is adjusted in 1.5～3.0 scopes, with the gelation time of control gelled fracturing fluid; Gel breaker is (1.0～3.0) by ammonium persulphate and S-WAT by mass ratio: 1 redox system formed; Can make frozen glue at the broken glue of coldcondition; The massfraction of gel breaker in the fracturing liquid total amount is that 0.06%～0.12%, 30 ℃ of corresponding down broken glue times are 2.0～4.0h; Its surplus is a water, and each constituent mass mark sum is 100%.
The invention has the beneficial effects as follows:, adjust the gelation time and the broken glue time of gelled fracturing fluid through the pH value of regulation system owing to added the pH regulator agent.Forming the used linking agent of gelled fracturing fluid is zirconium oxychloride; Constituted the Zirconium gel fracturing liquid; Compare with plant gum fracturing fluid with the active water fracturing liquid; That the Zirconium gel fracturing liquid has is cheap, crosslinked at low temperature speed is fast, viscosity is big, low leak-off, broken glue thoroughly and breaking glue solution do not have residue, be prone to the characteristics of the row of returning, can improve the coal-seam gas production capacity effectively.
Embodiment:
Specify the present invention below in conjunction with embodiment.
Embodiment 1:
After adding non-ionic polyacrylamide 150g fully dissolves in 49.85kg water, add ammonium persulphate 15g and S-WAT 15g, add hydrochloric acid 60g again system pH is adjusted to 1.5, be made into base fluid.Join in the base fluid zirconium oxychloride 7g and stirring formation Zirconium gel fracturing liquid, the gelation time of gained gelled fracturing fluid is 40s, and the broken glue time is 3.0h, and continuous preparation can be realized in the scene.
Embodiment 2:
After adding non-ionic polyacrylamide 200g fully dissolves in 49.80kg water, add ammonium persulphate 30g and S-WAT 15g, add hydrochloric acid 15g again system pH is adjusted to 2.2, be made into base fluid.Join in the base fluid zirconium oxychloride 15g and stirring formation Zirconium gel fracturing liquid, the gelation time of gained gelled fracturing fluid is 20s, and the broken glue time is 2.0h, and continuous preparation can be realized in the scene.
Embodiment 3:
After adding non-ionic polyacrylamide 250g fully dissolves in 49.75kg water, add ammonium persulphate 45g and S-WAT 15g, add hydrochloric acid 5g again system pH is adjusted to 3.0, be made into base fluid.Join in the base fluid zirconium oxychloride 20g and stirring formation Zirconium gel fracturing liquid, the gelation time of gained gelled fracturing fluid is 15s, and the broken glue time is 4.0h, and continuous preparation can be realized in the scene.
Claims (1)
1. the gelled fracturing fluid of a suitable coalbed methane reservoir pressure break is made up of non-ionic polymers, linking agent, pH regulator agent, gel breaker and water, it is characterized in that: non-ionic polymers is the non-ionic type SEPIGEL 305, and relative molecular mass is 965 * 10
4, degree of hydrolysis is 3.31%, and solid content is 94.48%, and the massfraction in the fracturing liquid total amount is 0.3%～0.5%; Linking agent is zirconium oxychloride ZrOCl
2, the massfraction in the fracturing liquid total amount is 0.014%～0.04%; The pH regulator agent is a hydrochloric acid, and the massfraction in the fracturing liquid total amount is 0.01%～0.12%, and system pH is adjusted in 1.5～3.0 scopes; Gel breaker is (1.0～3.0) by ammonium persulphate and S-WAT by mass ratio: 1 redox system formed; Can make frozen glue at the broken glue of coldcondition; The massfraction of gel breaker in the fracturing liquid total amount is 0.06%～0.12%, and all the other are water, and the ratio sum of each component is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101502399A CN101805600B (en) | 2010-04-15 | 2010-04-15 | Gelled fracturing fluid being applicable to coalbed methane reservoir |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101502399A CN101805600B (en) | 2010-04-15 | 2010-04-15 | Gelled fracturing fluid being applicable to coalbed methane reservoir |
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| Publication Number | Publication Date |
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| CN101805600A CN101805600A (en) | 2010-08-18 |
| CN101805600B true CN101805600B (en) | 2012-11-07 |
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| CN2010101502399A Active CN101805600B (en) | 2010-04-15 | 2010-04-15 | Gelled fracturing fluid being applicable to coalbed methane reservoir |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766450B (en) * | 2012-08-15 | 2014-03-26 | 中国石油大学(华东) | Nitrogen foam fracturing fluid for coal bed methane and preparation method of nitrogen foam fracturing fluid |
| CN102936490B (en) * | 2012-11-13 | 2015-02-18 | 中国石油大学(华东) | Preparation method of environment-friendly multi-scale zirconium gel dispersion plugging agent |
| CN117189063A (en) * | 2023-10-10 | 2023-12-08 | 重庆大学 | Fracturing transformation method for coalbed methane ground well without addition of propping agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381598A (en) * | 2008-10-24 | 2009-03-11 | 延长油田股份有限公司子北采油厂 | Fracture liquid and preparation method thereof |
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2010
- 2010-04-15 CN CN2010101502399A patent/CN101805600B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381598A (en) * | 2008-10-24 | 2009-03-11 | 延长油田股份有限公司子北采油厂 | Fracture liquid and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 戴彩丽等.影响锆冻胶成冻因素的研究.《油田化学》.2001,第18卷(第3期),第228-231页. * |
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Address after: 266580 Changjiang Road West, Qingdao Development Zone, Shandong, China, 66 Patentee after: China Petroleum University (East China) Address before: 257061 North Dongying Road, Dongying, Shandong, No. two, No. 271 Patentee before: China Petroleum University (East China) |
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Effective date of registration: 20200629 Address after: 266580 271 north two road, Dongying District, Dongying, Shandong. Co-patentee after: CHINA NATIONAL PETROLEUM CORPORATION SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Patentee after: China University of Petroleum (East China) Address before: 266580 No. 66 West Changjiang Road, Qingdao Development Zone, Shandong Patentee before: China University of Petroleum (East China) |