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Quantitative acidizing liquid slug combination selection method for carbonate rocks

A carbonate rock and acid technology, which is applied in measuring devices, earthwork drilling, preparation of test samples, etc., and can solve problems such as no literature reports.

Active Publication Date: 2022-01-04
CHINA OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the research on the combination of different types of acid slugs has not been reported in the literature

Method used

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  • Quantitative acidizing liquid slug combination selection method for carbonate rocks
  • Quantitative acidizing liquid slug combination selection method for carbonate rocks
  • Quantitative acidizing liquid slug combination selection method for carbonate rocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Core sample and acid solution preparation

[0040] Cut the core of the target carbonate rock into a number of standard core samples with a specification of 25.4mm (diameter) * 60mm (length); prepare three different types of retarded acid systems A, B, and C.

[0041] Acid liquid system A is emulsified acid, oil phase: acid phase = 3:7, oil phase: 93% diesel oil + 7% emulsifier, acid phase: 21.4% HCL + 2% corrosion inhibitor + 1% iron stabilizer;

[0042] The grade of diesel is -10# industrial diesel;

[0043] The emulsifier is WD-31 emulsifier, purchased from Chengdu Anshide Petroleum Technology Development Co., Ltd.;

[0044] HCL is 31% industrial hydrochloric acid, purchased from Tianjin Development Zone Over Industry and Trade Co., Ltd.;

[0045] The corrosion inhibitor is Mannich base quaternary ammonium salt corrosion inhibitor (high temperature acidification corrosion inhibitor), purchased from Tianjin Juli Polymer Petroleum Engineering Technology Co., Ltd.; ...

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Abstract

The invention discloses a quantitative acidizing liquid slug combination selection method for carbonate rocks. The quantitative acidizing liquid slug combination selection method can realize the purposes of reducing the acidizing liquid dosage and reducing the acidizing liquid cost by quantitatively evaluating the synergistic effect of different acidizing liquid slug combinations and optimizing the acidizing liquid slug combinations, and provides a theoretical basis for selection of a carbonate rock acidification acidizing liquid system and optimization of acidification process parameters.

Description

technical field [0001] This article involves but is not limited to the field of oil and gas field development, especially involves but is not limited to an experimental method for quantitative optimization of carbonate rock slug combinations. Background technique [0002] Acidizing is one of the most effective stimulation measures for carbonate reservoir stimulation. The key to acidizing stimulation is to form acid-etched wormholes in the reservoir rock after acid treatment, which can effectively communicate with the wellbore and improve the permeability of the reservoir. In recent years, various retarded acid systems have been gradually developed and improved at home and abroad to achieve deep treatment by controlling fluid loss and delaying the reaction rate of acid rock. Among them, acid systems such as emulsified acid, gelling acid, cross-linked acid, steering acid, and chelating acid have excellent retarding properties and are widely used. The emulsified acid system e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N1/34G01N23/046E21B43/27
CPCG01N15/0826G01N1/34G01N23/046E21B43/27
Inventor 崔波荣新明冯浦涌高纪超邵尚奇王达杨国威李敬松李翔王春林张强陈军
Owner CHINA OILFIELD SERVICES