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Guar gum fracturing fluid

A technology of fracturing fluid and guar gum, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as shear instability, proppant settlement, and viscoelasticity reduction of jelly systems, and achieve water reduction. Lock effect, low surface tension, easy to disperse and dissolve

Active Publication Date: 2014-04-02
四川川庆井下科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the concentration of guar gum alone will encounter the problems of fracturing fluid gelation, temperature resistance, and shear resistance instability, which will lead to a decrease in the viscoelasticity of the gel system and settlement of proppant. Under the premise of ensuring fracture creation and sand carrying, try to Reducing matrix damage caused by fracturing fluid to propped fractures and fracture walls is an important direction for fracturing fluid research and improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 989mL of water into a beaker with a capacity of 1000mL, add 10g of KCl under stirring, then weigh 3g of modified hydroxypropyl guar gum, slowly add it into water under stirring, stir at high speed for 10min, then add 1mL of bromogeramine successively, 1.5 g sodium thiosulfate, 2g sodium carbonate, 10mL drainage aid, and continue to stir at high speed for 10min to complete the preparation of the base liquid; take 100mL of the base liquid prepared above, add 0.35mL organoboron cross-linking agent under stirring, and continue stirring After 1 min, a jelly that can be hung is formed, and the preparation of the jelly solution is completed; take 100 mL of the base liquid prepared above, add 0.1 g of ammonium persulfate under stirring, and then add 0.35 mL of organoboron cross-linking agent, and continue stirring for 1 min Finally, a jelly was formed, and kept at a constant temperature in a water bath at 90° C. After 2 hours, the jelly was completely hydrated. The apparent...

Embodiment 2

[0027] Add 989mL of water into a beaker with a capacity of 1000mL, and add 10g of NH 4 Cl, then weigh 3g modified hydroxypropyl guar gum, slowly add it into water under stirring, stir at high speed for 10min, then add 1mL bromogeramine, 1.5g sodium bisulfite, 0.3g sodium hydroxide, 10mL drainage aid Then continue to stir at high speed for 10 minutes to complete the preparation of the base liquid; take 100 mL of the base liquid prepared above, add 0.35 mL of organic boron cross-linking agent under stirring, and continue stirring for 1 min to form a jelly that can be hung and complete the freezing process. Gel preparation: Take 100mL of the base liquid prepared above, add 0.1g of ammonium persulfate under stirring, then add 0.35mL of organic boron crosslinking agent, continue stirring for 1min to form a jelly, and keep it in a water bath at 90°C. After 2h, the jelly was completely hydrated. The apparent viscosity of the gel-breaking liquid measured by a ZNN-D6 viscometer is 1.5...

Embodiment 3

[0029] Add 989mL of water into a beaker with a capacity of 1000mL, add 10g of KCl under stirring, then weigh 3g of modified hydroxypropyl guar gum, slowly add it into water under stirring, stir at high speed for 10min, then add 1mL of bromogeramine successively, 1.5 g sodium bisulfite, 0.3g sodium hydroxide, 10mL drainage aid, and then continue high-speed stirring for 10min to complete the preparation of the base liquid; take 100mL of the base liquid prepared above, add 0.35mL organoboron crosslinking agent under stirring state, After continuing to stir for 1min, a jelly that can be hung is formed, and the preparation of the jelly is completed; take 100mL of the base solution prepared above, add 0.1g of ammonium persulfate under stirring, then add 0.35mL of organic boron crosslinking agent, and continue stirring After 1 min, a jelly was formed, and kept at a constant temperature in a water bath at 90° C. After 2 h, the jelly was completely hydrated. The apparent viscosity of t...

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Abstract

The invention discloses guar gum fracturing fluid. The guar gum fracturing fluid is characterized by comprising a base solution, a gel breaker and a crosslinking agent, wherein the base solution comprises the following components by weight percent: 0.2-0.4% of guar gum, 0.01-0.3% of bactericide, 0.2-1% of clay stabilizer, 0.01-0.2% of pH modifier, 0.5-1% of cleanup additive, 0.1-0.15% of temperature stabilizer, and the balance of water, wherein the gel breaker is 0.05-0.3% of weight of the base solution; the crosslinking agent is 0.1-0.8% of weight of the base solution. By using the novel foaming cleanup additive, the guar gum fracturing fluid is low in surface tension, and strong in foaming power, and gel breaking liquid can be smoothly discharged out of stratum, so as to achieve the target of cleaning downhole accumulated liquid. Thus, the water lock effect of the downhole is reduced, and meanwhile, a part of densifier scraps can be carried by the gel breaking liquid, so as to further reduce the damage.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a guar gum fracturing fluid. Background technique [0002] At present, the thickener of the hydraulic fracturing fluid system used in domestic oilfields is mainly guar gum and its modified products. With the development of the world economy further increasing the demand for energy, the global demand for guar gum has increased sharply, but the output is limited. The price of guar gum and its modified products on the market is increasing day by day, and the supply is often in short supply. In the face of changes in the fracturing fluid market, it is necessary to develop and apply a new low-damage fracturing fluid system to improve the fracturing effect and reduce the damage to the formation. Through the study of high-performance guar gum system, under the condition of satisfying the construction technology, the reservoir damage can be reduced and the production efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/604C09K8/605C09K8/665C09K8/685C09K8/887C09K8/905C09K2208/26
Inventor 管彬陈英张晓虎王亚南陆丽牟泽知刘思岐刘腊梅周瀚包雨霏
Owner 四川川庆井下科技有限公司
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