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Reusable Hydroxypropyl Guarin Fracturing Fluid

A technology of hydroxypropyl guar gum and fracturing fluid, applied in the field of chemicals, can solve the problem of inability to match the properties of hydroxypropyl guar gum cross-linking, save chemical raw materials, reduce fracturing costs, and protect the environment. Effect

Active Publication Date: 2018-03-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the solid sustained-release acid molecule itself is acidic, which cannot match the crosslinking properties of hydroxypropyl guar gum under alkaline conditions, so it cannot be used as a sustained-release breaker for hydroxypropyl guar gum fracturing fluid

Method used

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  • Reusable Hydroxypropyl Guarin Fracturing Fluid
  • Reusable Hydroxypropyl Guarin Fracturing Fluid
  • Reusable Hydroxypropyl Guarin Fracturing Fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] When in use, prepare 0.35% hydroxypropyl guar gum aqueous solution, add additives such as 0.03% pH regulator, 3% drainage aid, 2% clay stabilizer after being fully swollen, with 0.3% borax as cross-linking agent, form can After hanging the jelly, add 0.5% gel breaker ammonium oxalate and paraformaldehyde, the mass ratio of the two is 2:1, the viscosity will drop to 40mPa·s and the pH value will drop to 7 after 3 hours at 40°C. On this basis, continue to add additives, adjust the pH to 9-10 and add a cross-linking agent to still form a pickable jelly, so the flowback liquid can be reused. If the fracturing fluid is not recycled, its final viscosity can be reduced to 5mPa·s, and the gel can be completely hydrated and broken.

Embodiment 2

[0028] When in use, prepare 0.35% hydroxypropyl guar gum aqueous solution, add additives such as 0.03% pH regulator, 3% drainage aid, 2% clay stabilizer after being fully swollen, with 0.3% borax as cross-linking agent, form can After hanging the jelly, add 0.5% gel breaker ammonium acetate and paraformaldehyde, the mass ratio of the two is 2:1, the viscosity will drop to 40mPa·s and the pH value will drop to 7 after 3 hours at 40°C. On this basis, continue to add additives, adjust the pH to 9-10 and add a cross-linking agent to still form a pickable jelly, so the flowback liquid can be reused. If the fracturing fluid is not recycled, its final viscosity can be reduced to 5mPa·s, and the gel can be completely hydrated and broken.

Embodiment 3

[0030] When in use, prepare 0.35% hydroxypropyl guar gum aqueous solution, add additives such as 0.02% pH regulator, 2% drainage aid, 1% clay stabilizer after being fully swollen, with 0.2% borax as crosslinking agent, form can After hanging the jelly, add 0.3% gel breaker ammonium oxalate and paraformaldehyde, the mass ratio of the two is 2:1, the viscosity will drop to 40mPa·s and the pH value will drop to 7 after 100min at 60°C. On this basis, continue to add additives, adjust the pH to 9-10 and add a cross-linking agent to still form a pickable jelly, so the flowback liquid can be reused. If the fracturing fluid is not recycled, its final viscosity can be reduced to 5mPa·s, and the gel can be completely hydrated and broken.

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Abstract

The invention discloses a reusable hydroxypropyl guar gum fracturing fluid, which at least comprises the following components and the weight percentage of each component is: 0.35% of hydroxypropyl guar gum powder, and 0.01%-0.03% of a pH regulator , drainage aid 1%-3%, clay stabilizer 0.5%-2%, cross-linking agent 0.1%-0.3%, gel breaker 0.2%-0.6%, and the balance is water; the cross-linking agent is borax or Organic boron; the breaker is a compound of ammonium oxalate and paraformaldehyde or a compound of ammonium acetate and paraformaldehyde, wherein the mass ratio of ammonium oxalate and paraformaldehyde is 2:1 or ammonium acetate The mass ratio with paraformaldehyde is 2:1. The slow-release acid breaker in the present invention does not destroy the macromolecular chains of the guar gum macromolecules, so the fracturing fluid returned and discharged can still be reused after professional treatment, which can greatly save chemical raw materials and reduce production costs. Fracking costs, saves the environment.

Description

technical field [0001] The invention relates to a chemical used in the field of oil field stimulation improvement measures, in particular to a reusable hydroxypropyl guar gum fracturing fluid. Background technique [0002] Hydroxypropyl guar gum fracturing fluid is a polysaccharide polymer fracturing fluid widely used in oilfields. The thickener hydroxypropyl guar gum can maintain the viscosity of the liquid to carry the proppant and control the fluid loss. Concentration or filter cake formation of these polymers can significantly reduce the conductivity of the proppant-packed zone. Therefore, after fracturing operations, these polymers must be broken and flowed back. However, early addition of strong oxidants to break the gel in the early stage of construction will cause the fracturing fluid to hydrate prematurely and break the gel. The currently widely used capsule breaker has a delayed release effect, which has almost no effect on the viscosity of the fracturing fluid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 尹光伟王林张世林王玉忠邹鹏杨庭安徐庆祥
Owner BC P INC CHINA NAT PETROLEUM CORP
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