Recyclable fracturing fluid and preparation method thereof

A fracturing fluid and base fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as non-reusability, and achieve the effects of saving materials and water resources, reducing sewage, and reducing water pressure

Active Publication Date: 2014-01-15
北京国海能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular chain of the thickener in the returned fracturing fluid has been deeply degraded and cannot be reused. It needs to be properly treated in accordance with environmental protection requirements before it can be discharged.

Method used

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  • Recyclable fracturing fluid and preparation method thereof
  • Recyclable fracturing fluid and preparation method thereof
  • Recyclable fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The fracturing fluid includes the following main raw materials prepared in parts by weight: 0.2 part of guar gum derivative thickener, 0.02 part of crosslinking agent, 0.01 part of pH regulator, 1 part of fluid loss control agent, and 1 part of fungicide and 92.1 parts of water. The guar gum derivative thickener is small molecule guar gum; the cross-linking agent is organoboron; the pH regulator is sodium carbonate; the fluid loss reducer is modified starch ether DA1688; The agent is an aqueous solution with acrolein content of 0.5%.

[0029] Its preparation method comprises the following steps:

[0030] 1. Dissolve the thickening agent of guar gum derivatives in water and mix evenly to obtain the thickened base liquid;

[0031] 2. Add a pH regulator to the thickened base liquid prepared in step 1 to adjust the pH value of the thickened base liquid to 9-10;

[0032] 3. Slowly add a crosslinking agent to the thickened base liquid after adjusting the pH value in step 2...

Embodiment 2

[0035] The fracturing fluid includes the following main raw materials prepared in parts by weight: 0.35 parts of guar gum derivative thickener, 0.035 parts of crosslinking agent, 0.03 parts of pH regulator, 1 part of fluid loss control agent, and 1 part of fungicide and 96.5 parts of water.

[0036] The guar gum derivative thickener is any one of hydrophobically modified carboxymethyl hydroxypropyl guar gum; the crosslinking agent is organoboron; the pH regulator is potassium carbonate; the fluid loss control The agent is modified starch ether DA1688; the bactericide is an aqueous solution with a urea-formaldehyde content of 0.5%.

[0037] Its preparation method comprises the following steps:

[0038] 1. Dissolve the thickening agent of guar gum derivatives in water and mix evenly to obtain the thickened base liquid;

[0039] 2. Add a pH regulator to the thickened base liquid prepared in step 1 to adjust the pH value of the thickened base liquid to 9-10;

[0040] 3. Slowly ...

Embodiment 3

[0043] The fracturing fluid includes the following main raw materials prepared in parts by weight: 0.27 parts of guar gum derivative thickener, 0.027 parts of crosslinking agent, 0.02 parts of pH regulator, 1 part of fluid loss reducer, and 1 part of fungicide and 94.3 parts of water.

[0044] The guar gum derivative thickener is small molecule guar gum; the cross-linking agent is organoboron; the pH regulator is sodium hydroxide; the fluid loss reducer is modified starch ether DA1688; The bactericide is an aqueous solution containing 1,4-hydroquinone with a content of 0.5%.

[0045] Its preparation method comprises the following steps:

[0046] 1. Dissolve the thickening agent of guar gum derivatives in water and mix evenly to obtain the thickened base liquid;

[0047] 2. Add a pH regulator to the thickened base liquid prepared in step 1 to adjust the pH value of the thickened base liquid to 9-10;

[0048] 3. Slowly add a crosslinking agent to the thickened base liquid aft...

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Abstract

The invention belongs to the technical field of oilfield fracturing stimulation, and particularly relates to a recyclable fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following main raw materials in parts by weight: 0.2-0.35 part of a guar gum derivative thickener, 0.02-0.035 part of a cross-linking agent, 0.01-0.03 part of a pH regulator, 1 part of a fluid loss additive, 1 part of a bactericide and 92.1-96.5 parts of water. The recyclable fracturing fluid has the advantages of high flowback fluid recycling rate, and capabilities of turning waste into treasure, saving materials and water resource, reducing pollution discharge and reducing the pressure of water for underground operation.

Description

technical field [0001] The invention belongs to the technical field of oil field fracturing stimulation, and in particular relates to a recyclable fracturing fluid and a preparation method thereof. Background technique [0002] The water-based fracturing fluid commonly used at present usually uses guar gum or hydroxypropyl guar gum as the thickener, and is cross-linked with various ions to obtain a viscoelastic jelly, which has good sand-carrying performance and fluid loss control performance and rheological properties. Gel breakers such as oxidants, enzymes, and acids are often added to the fracturing fluid formula. After the fracturing operation is completed, the gel breaks and the viscosity drops to close to the viscosity of water, so as to facilitate the return of the fracturing fluid and avoid lasting damage to the formation. However, the molecular chain of the thickener in the returned fracturing fluid has been deeply degraded and cannot be reused. It needs to be prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/685C09K8/887C09K8/90
Inventor 张玄张鹏张聪忠张义勤
Owner 北京国海能源技术研究院
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