Acid liquid for low-friction-resistance deep acidification and acid fracturing of oil and gas well

A technology of deep acidification and low friction, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult flowback and high construction friction resistance, so as to improve flowback rate, increase production capacity, and smooth circulation channel effect

Inactive Publication Date: 2018-11-23
SICHUAN WELDON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an acid solution for deep acid fracturing with low friction resistance in oil and gas wells....

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An acid liquid for deep acid fracturing with low friction resistance in oil and gas wells, comprising the following components in parts by weight: 15 parts of hydrochloric acid, 1 part of high-temperature corrosion inhibitor for acidification, 0.4 parts of thickener for acidification, and high-temperature iron for acidification 0.5 part of ion stabilizer, 0.5 part of drainage aid for acidification, 0.5 part of demulsifier for acidification, and 0.5 part of clay stabilizer for acidification.

[0027] In this embodiment, the initial viscosity of the acid solution is 42 mPa·s, the viscosity of the residual acid is 4.5 mPa·s, and the flowback rate is 65%.

Embodiment 2

[0029] An acid liquid for acid fracturing with low friction and deep acidification of oil and gas wells, comprising the following components in parts by weight: 25 parts of hydrochloric acid, 3 parts of high-temperature corrosion inhibitor for acidification, 1.2 parts of thickener for acidification, and high-temperature iron for acidification 1.5 parts of ion stabilizer, 1.5 parts of drainage aid for acidification, 1.5 parts of demulsifier for acidification, and 1.5 parts of clay stabilizer for acidification.

[0030] In this embodiment, the initial viscosity of the acid solution is 40.5 mPa·s, the viscosity of the residual acid is 4.5 mPa·s, and the flowback rate is 72%.

Embodiment 3

[0032] An acid liquid for acid fracturing in low-friction deep acidification of oil and gas wells, comprising the following components in parts by weight: 18 parts of hydrochloric acid, 1.5 parts of high-temperature corrosion inhibitor for acidification, 0.6 parts of thickener for acidification, and high-temperature iron for acidification 0.8 part of ion stabilizer, 0.8 part of drainage aid for acidification, 0.8 part of demulsifier for acidification, and 0.8 part of clay stabilizer for acidification.

[0033] In this embodiment, the initial viscosity of the acid solution is 42 mPa·s, the viscosity of the residual acid is 3 mPa·s, and the flowback rate is 69%.

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Abstract

The invention discloses acid liquid for low-friction-resistance deep acidification and acid fracturing of an oil and gas well. The acid liquid is prepared from the following components in parts by weight: 11 to 25 parts of inorganic acid, 1 to 3 parts of a high-temperature corrosion inhibitor for acidification, 0.4 to 1.2 parts of a thickening agent for acidification, 0.5 to 1.5 parts of a high-temperature iron ion stabilizing agent for acidification, 0.5 to 1.5 parts of a discharge aiding agent for acidification, 0.5 to 1.5 parts of a demulsifying agent for acidification and 0.5 to 1.5 partsof a clay stabilizing agent for acidification. The acid liquid disclosed by the invention has the advantages of good hydrogen ion slow release performance, low friction resistance, high flow-back rate, capability of automatically demulsifying, and stable anti-swelling effect on clay; the problems in the prior art that the flow-back difficult is great and the construction friction resistance is high can be effectively solved.

Description

technical field [0001] The invention relates to the field of thickened acid liquid for fracturing technology, in particular to an acid liquid for acid fracturing with low friction and deep acidification of oil and gas wells. Background technique [0002] Due to the strong reaction of acid liquid and the fast reaction speed of acid rock in conventional acidizing, the acid liquid leakage is serious, resulting in short effective length of acid fracturing fractures, which meets the requirement of non-construction. Using conventional acid for acidification has high frictional resistance of the acid fluid. In the oil and gas wells with a depth of more than 4000m, the wellhead pressure is high during the acidification construction process, and the requirements for imported equipment are extremely high, which greatly affects the efficiency and safety of construction. [0003] There is a document disclosing a temperature-controlled acid fracturing technology for viscous acid. During ...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 何伟王彬周强
Owner SICHUAN WELDON CHEM
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