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Weighted fracturing fluid

A fracturing fluid and weighting agent technology, applied in the field of fracturing fluid, can solve the problems of high toxicity, harm to the human body and the environment, and serious corrosion of pipes, etc., to achieve good temperature resistance and shear resistance, reduce damage, and low corrosion speed effect

Inactive Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of the inorganic salts used in the prior art, such as narrow adjustable range of weighting density, severe corrosion to pipes, easy crystallization at low temperature, high toxicity, and harm to human body and environment, etc. Organic salt aggravated fracturing fluid for fracturing stimulation of high stress wells or tight oil and gas reservoirs

Method used

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Embodiment 1

[0010] The components and dosage of this embodiment are: weighting agent HCOONa, dosage 20.0%; thickener hydroxypropyl guaridine, dosage 0.5%; fungicide is formaldehyde, dosage 0.1%; pH agent NaOH, dosage 0.1%; Fluorocarbon surfactant, the dosage is 0.1%; the high temperature stabilizer is sodium thiosulfate, the dosage is 0.2%; the clay stabilizer is KCl, the dosage is 1%; the crosslinking agent is organic borate, the dosage is 0.3% ; Water is 77.7%.

Embodiment 2

[0012] The components and dosage of this embodiment are: the weighting agent is HCOOK, and the dosage is 55.0%; the thickener is hydroxypropyl guar gum, and the dosage is 0.46%; the fungicide is formaldehyde, and the dosage is 0.1%; the pH agent is NaOH, and the dosage is 0.1%; the drainage aid is fluorocarbon surfactant, the dosage is 0.1%; the high temperature stabilizer is sodium thiosulfate, the dosage is 0.2%; the clay stabilizer is KCl, the dosage is 1%; the crosslinking agent is organoboron acid salt, the addition amount is 0.3%; water is 42.74%.

Embodiment 3

[0014] Present embodiment component and consumption are: weighting agent is the mixture of HCOONa and HCOOK, and HCOONa consumption is 21.0%, and HCOOK consumption is 12.0%; Thickener is hydroxypropyl guar gum, and consumption is 0.46%; Bactericide is formaldehyde, The dosage is 0.1%; the pH agent is NaOH, the dosage is 0.1%; the drainage aid is fluorocarbon surfactant, the dosage is 0.1%; the high temperature stabilizer is sodium thiosulfate, the dosage is 0.2%; the clay stabilizer is KCl, The dosage is 1%; the cross-linking agent is organic borate, the dosage is 0.3%; the water is 64.74%.

[0015] Embodiment 4-10 is identical with above-mentioned embodiment preparation method, and specific formula is as shown in table 1.

[0016] Table 1 Embodiment of the present invention

[0017]

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Abstract

The invention relates to weighted fracturing fluid and belongs to the technical field of oilfield chemistry. The weighted fracturing fluid comprises organic acid salt weighting agents, thickening agents, cross-linking agents, pH (potential of hydrogen) conditioning agents, discharge aiding agents, bacteriacide, clay stabilizers and high-temperature stabilizers by mixing. The organic-salt weighted fracturing fluid is adjustable within a wider density adjustment range of 1.05g / cm<3>-2.3g / cm<3> and lower in crystallization temperature to meet the requirements of low-temperature construction in winter due to the fact that the crystallization temperature of inorganic salt solution is generally above minus 20 DEG C but the crystallization temperature of formate solution even can be lower than about minus 60 DEG C. Besides, the weighted fracturing fluid has low corrosion rate so as to reduce corrosion to equipment, pipes and the like, has low toxicity and a biodegradable characteristic so as to reduce harm of bromide toxicity to human bodies and the environment, and has better temperature and shear resistance.

Description

technical field [0001] The invention relates to a fracturing fluid used in oil and gas well fracturing stimulation technology, which belongs to the field of oil field chemistry technology. It utilizes organic acid salts to aggravate the fracturing fluid, so as to complete various types of high-pressure, deep wells, high-stress wells or wells. Fracturing stimulation tasks of tight oil and gas reservoirs. Background technique [0002] In the fracturing process, there are more and more high-pressure, deep wells, high-stress wells or tight oil and gas reservoirs. Due to the limitation of the pressure resistance capacity of the completion equipment and ground equipment, the method of increasing the pressure of the wellbore fluid column is generally adopted to increase the pressure of the wellbore fluid column. To achieve the purpose of reducing the wellhead construction pressure. The fracturing fluid involved in domestic invention patents 200510105813 (a weighted fracturing flui...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 肖兵银本才张高群陈波胡娅娅杨超谢娟于春虎
Owner CHINA PETROLEUM & CHEM CORP
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