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Porous sandstone reservoir permeability-enhancing sand-stabilizing acidizing compound working solution as well as preparation method and application thereof

A working fluid and reservoir technology, applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of unfavorable loose sandstone reservoirs such as increasing seepage and stabilizing sand, so as to slow down the reaction of fluoboric acid and improve The effect of increasing production capacity and increasing penetration rate

Pending Publication Date: 2022-06-07
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the patented formula mainly enhances the solubility of boric acid and inhibits the secondary precipitation of fluoride (calcium fluoride). The system is the same, which is not conducive to increasing permeability and stabilizing sand in unconsolidated sandstone reservoirs.

Method used

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  • Porous sandstone reservoir permeability-enhancing sand-stabilizing acidizing compound working solution as well as preparation method and application thereof
  • Porous sandstone reservoir permeability-enhancing sand-stabilizing acidizing compound working solution as well as preparation method and application thereof
  • Porous sandstone reservoir permeability-enhancing sand-stabilizing acidizing compound working solution as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the present embodiment, the osmotic stabilized sand acidification composite working liquid of the loose sandstone reservoir (according to the configuration of 1000kg), the component weight is kg:

[0035]

[0036]

[0037] Among them, the organic cationic polymer anti-expansion agent and the cycloalkyl imidazoline corrosion inhibitor were purchased from Tianjin Tiancheng Chemical Co., Ltd. or Shandong Deshi Chemical Co., Ltd.

[0038] In the acid-resistant stirring reaction tank, a sufficient amount of water is added, the above-mentioned industrial raw materials are placed in accordance with industrial hydrochloric acid, acetic acid, fluorosilic acid, fluoroboric acid, boric acid, glycol monobutyl ether, polyethoxylated fatty alcohol, organic cationic polymer, cycloalkyl imidazoline in the order of acid-resistant stirring reaction tank, evenly stirred for 30-60 minutes, the acid is filtered to obtain the finished working liquid.

Embodiment 2

[0040] In the present embodiment, the osmotic stabilized sand acidification composite working liquid of the loose sandstone reservoir (according to the configuration of 1000kg), the component weight is kg:

[0041]

[0042] Among them, the organic cationic polymer anti-expansion agent and the cycloalkyl imidazoline corrosion inhibitor were purchased from Tianjin Tiancheng Chemical Co., Ltd. or Shandong Deshi Chemical Co., Ltd.

[0043] The above industrial raw materials are put into the acid-resistant stirring reaction tank in accordance with the order of industrial hydrochloric acid, acetic acid, fluorosilic acid, fluoroboric acid, boric acid, glycol monobutyl ether, polyethoxylated fatty alcohol, organic cationic polymer, cycloalkyl imidazoline, and evenly stirred for 30-60 minutes, and the acid is filtered to obtain a finished working liquid.

Embodiment 3

[0045] In the present embodiment, the osmotic stabilized sand acidification composite working liquid of the loose sandstone reservoir (according to the configuration of 1000kg), the component weight is kg:

[0046]

[0047] Among them, the organic cationic polymer anti-expansion agent and the cycloalkyl imidazoline corrosion inhibitor were purchased from Tianjin Tiancheng Chemical Co., Ltd. or Shandong Deshi Chemical Co., Ltd.

[0048] In the acid-resistant stirring reaction tank, a sufficient amount of water is added, the above-mentioned industrial raw materials are placed in accordance with industrial hydrochloric acid, acetic acid, fluorosilic acid, fluoroboric acid, boric acid, glycol monobutyl ether, polyethoxylated fatty alcohol, organic cationic polymer, cycloalkyl imidazoline in the order of acid-resistant stirring reaction tank, evenly stirred for 30-60 minutes, the acid is filtered to obtain the finished working liquid.

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Abstract

The invention provides a loose sandstone reservoir permeability-enhancing sand-stabilizing acidification composite working solution and a preparation method and application thereof. The loose sandstone reservoir permeability-enhancing sand-stabilizing acidification composite working solution is composed of hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, a reservoir protection additive and water. The compound working fluid can be used for deeply and slowly acidizing to increase the permeability of a loose sandstone reservoir and improve the productivity of an oil-water well; fluorosilicic acid is adopted as a main acid, can react with albite, potassium feldspar, kaolinite and montmorillonite in a reservoir stratum under the combined action of hydrochloric acid and acetic acid, and basically does not react with a silicon dioxide skeleton in quartz, and boric acid is adopted to absorb fluosilicic acid and fluoboric acid to generate hydrofluoric acid, so that a sandstone skeleton is protected and prevented from being damaged by acidification, and thus sand production blockage is aggravated; boric acid and fluoboric acid synergistically repair and loosen the sandstone reservoir; and secondary precipitation of fluosilicate except calcium fluoride is prevented under the combined action of boric acid, hydrochloric acid and acetic acid.

Description

Technical field [0001] The present invention relates to the technical field of oilfield reservoir production enhancement measures, more particularly to a loose sandstone reservoir permeation stable sand acidification composite working liquid and its preparation method and application. Background [0002] China offshore oilfield loose sandstone proportion is high, according to statistics the largest crude oil production in the Bohai oilfield proportion of up to 80%, in the production process is prone to particulate transport, mud and other damage blockage, and acidification is an effective measure to lift the near well blockage process technology, according to statistics annual construction volume of up to 400-500 well times / year, is the main offshore production measures technology, offshore oilfield has used fluoroboronic acid, polyhydric acid and other acidification working liquid system, achieved significant operating results, but with the increase in the number of repeated a...

Claims

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Application Information

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IPC IPC(8): C09K8/72E21B43/22
CPCC09K8/72E21B43/16
Inventor 孙林刘全刚周际永苏延辉李旭光杨军伟陈维余黄小凤黄利平夏光孟向丽熊培祺麻路
Owner CNOOC ENERGY TECH & SERVICES
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