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A high-efficiency retarded solid acid system that does no damage to the reservoir

A solid acid, retarding technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as limited effects, and achieve the effects of avoiding precipitation, increasing retarding ability, and obvious retarding effect

Active Publication Date: 2020-07-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its solid acid system still uses traditional hydrochloric acid as the main component, and the reaction between hydrochloric acid and carbonate rock is relatively violent and rapid, and the effect is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 2kg solid glycolic acid and 10kg guar gum are stirred and mixed evenly, and the outlet size of the extruder is controlled to obtain 20 mesh particles. Put the granules into the coating pan, mix in 0.02g of zinc acetate, start the coating pan, rotate at a speed of 100 rpm, and irradiate the inside of the coating pan with an infrared lamp. After rotating for 15 minutes, 95% of Glycolic acid aqueous solution, rotate while spraying, spray for 60min, stop. Continue to rotate for 40min to obtain the wrapped solid acid.

Embodiment 2

[0024] Stir and mix 5kg solid lactic acid and 10kg starch evenly, control the outlet size of the extruder, and obtain 40 mesh granules. Put the granules into the coating pot, mix in 0.1g of zinc acetate, start the coating pot, rotate at a speed of 300 rpm, and irradiate the inside of the coating pot with an infrared lamp. After rotating for 20 minutes, 96% of Glycolic acid aqueous solution, rotate while spraying, spray for 80min, stop. Continue to rotate for 60 minutes to obtain wrapped solid acid.

Embodiment 3

[0026] Stir and mix 8kg solid glycolic acid with 6kg locust bean gum and 4kg hydroxypropyl carboxymethyl cellulose, control the outlet size of the extruder to obtain 70 mesh particles. Put the granules into the coating pot, then mix in 0.32g of zinc acetate, start the coating pot, rotate at a speed of 200 rpm, and irradiate the inside of the coating pot with an infrared lamp. After rotating for 30 minutes, 95% of Glycolic acid aqueous solution, rotate while spraying, spray for 90min, stop. Continue to rotate for 30 minutes to obtain wrapped solid acid.

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PUM

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Abstract

The invention relates to a high-efficiency slow-speed solid acid system without damage to the reservoir, which is composed of an acidic substance and an easily degradable natural polymer. The acidic substance is one or both of glycolic acid and lactic acid Proportional mixture, the natural polymer is one or more random proportion mixtures of guar gum, starch, carboxymethyl cellulose, hydroxypropyl carboxymethyl cellulose and locust bean gum. The retarded solid acid system is prepared through the following process: mix the acidic substance and the natural polymer uniformly according to the mass ratio of 0.2-1.2:1, produce particles with a particle size of 20-70 mesh, put them in a coating pan, and sprinkle them with acetic acid Zinc powder, the coating pan is rotated at a speed of 100-300 rpm, while irradiating with an infrared lamp, and spraying a glycolic acid aqueous solution with a concentration of 92-98% for 60-90 minutes with a spray gun. In the invention, the acidic substance is imported into the stratum in the form of being wrapped, and the retarding ability is greatly enhanced, no corrosion inhibitor is needed, and at the same time, it is easy to degrade, which is beneficial to environmental protection and has broad market application prospects.

Description

technical field [0001] The invention belongs to a high-efficiency slow-speed solid acid system which does no damage to reservoirs and belongs to the technical field of oil and gas production enhancement and reformation. Background technique [0002] Globally, carbonate oil and gas reservoirs are widely distributed and have great reserve potential. However, the heterogeneity of carbonate reservoirs is extremely strong, the geological conditions are complex, and the production rate is low. At present, the relatively mature acidizing / acid fracturing technology has become one of the leading technologies for establishing, increasing and stabilizing production of carbonate reservoirs. At present, the carbonate rocks with proven recoverable value in China have the characteristics of dense matrix and no oil, and the distribution of reservoirs is discontinuous. It is necessary to create long fractures through acid fracturing to improve the utilization efficiency of acid liquid, incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/72
CPCC09K8/72C09K8/725
Inventor 王世彬石朋钟钱虎游兴鹏蒋敏郭建春
Owner SOUTHWEST PETROLEUM UNIV