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A Method for Evaluating Effective Action Distance of Acid Liquid Based on Residual Acid Limit

A technology of effective action and acid solution, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of large residual acid limit, residual acid inactivation, residual acid limit error, etc., achieve short evaluation time, eliminate errors, and evaluate low cost effect

Active Publication Date: 2017-03-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] There are problems in this indoor evaluation method: first, the residual acid in the experimental reaction is not necessarily completely inactivated, and direct titration of the residual acid may easily cause errors in the residual acid limit; second, when the acid solution reacts to the late stage, the concentration of hydrogen ions decreases , the acid-rock reaction is mainly based on formula (2)
HCO3- ions do not ionize to produce H+ ions, which does not affect the residual acid limit of the acid solution, but can react with OH- ions, resulting in a larger residual acid limit

Method used

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  • A Method for Evaluating Effective Action Distance of Acid Liquid Based on Residual Acid Limit
  • A Method for Evaluating Effective Action Distance of Acid Liquid Based on Residual Acid Limit
  • A Method for Evaluating Effective Action Distance of Acid Liquid Based on Residual Acid Limit

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Embodiment 1

[0038] The invention provides a method for evaluating the effective action distance of acid liquid based on the residual acid limit, comprising the following steps:

[0039] (a) Establish a simulation diagram of acid concentration and effective action distance;

[0040] (b) Under formation temperature conditions, prepare cross-linking acid, gelling acid, and steering acid respectively, take 50-100 ml of cross-linking acid, gelling acid, and steering acid, and place them in experimental containers respectively;

[0041] (c) Utilize the pH meter to measure the pH value of cross-linking acid, gelling acid, and diverting acid, and calculate and record the molar concentrations of the acid solutions of the three acids according to the pH values, and the molar concentrations of the acid solutions are the initial molar concentrations of the acid solutions;

[0042] (d) Add 30-50 g of carbonate rock core columns to the experimental container respectively, the carbonate rock core column...

Embodiment 2

[0063] On the basis of Example 1, the core column is a uniform regular cylinder with a height of 2 cm and a bottom diameter of 2.5 cm. The carbonate rock in Daniudi Well No. 77 is selected, and the dolomite content is 81.22%. According to mass percentage, in the cross-linking acid, HCL accounts for 20%, cross-linking agent accounts for 1%, corrosion inhibitor accounts for 2%, corrosion inhibition synergist accounts for 0.5%, iron ion stabilizer accounts for 1%, anti-swelling agent Accounting for 1%, the drainage aid accounts for 1%, and the balance is distilled water. According to mass percentage, in the gelling acid, HCL accounts for 20%, gelling agent accounts for 0.7%, corrosion inhibitor accounts for 2%, corrosion inhibitor synergist accounts for 0.5%, iron ion stabilizer accounts for 1%, anti-swelling agent Accounting for 1%, the drainage aid accounts for 1%, and the balance is distilled water. According to mass percentage, HCL accounts for 20% in the described steering ...

Embodiment 3

[0065] On the basis of Example 2, the crosslinking agent is dicumyl peroxide, the corrosion inhibitor is 2-phosphonic acid butane 1,2,4-tricarboxylic acid, and the corrosion inhibition synergist is benzo Triazole, iron ion stabilizer is nitrilotriacetic acid, anti-swelling agent is quaternary ammonium salt, drainage aid is alkylphenol polyoxyethylene ether. The gelling agent is gelatin, the corrosion inhibitor is 2-phosphonic acid butane 1,2,4-tricarboxylic acid, the corrosion inhibition synergist is benzotriazole, and the iron ion stabilizer is nitrilotriacetic acid, The anti-swelling agent is quaternary ammonium salt, and the drainage aid is alkylphenol polyoxyethylene ether. The surfactant for steering acid is betaine oleate, the corrosion inhibitor is 2-phosphonic acid butane 1,2,4-tricarboxylic acid, the iron ion stabilizer is nitrilotriacetic acid, and the clay stabilizer is chlorine Dimethyldiallylammonium. According to the pH value described in the step (c), the acid...

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Abstract

The invention provides a method for evaluating the effective action distance of acid liquor on basis of the limit of reacted acid. The method comprises the following steps: the effective action distance of acid liquor is evaluated through evaluation of the limit of reacted acids of crosslinked acid, gelled acid and diverter acid according to a method for determining the concentration of hydrogen ions in an acid fluid system. When reacted acid is prepared, the stratum acid rock reaction condition is simulated by using excessive rock to fully react with acid, therefore the property of the obtained reacted acid is similar to that of stratum reverse discharging reacted acid in practical construction; by measurement of the pH values of fresh acid and reacted acid under the formation temperature, the limit of reacted acids of the crosslinked acid, gelled acid and diverter acid fluid systems can be quickly and accurately evaluated and measured, errors of a conventional titration evaluating method can be eliminated, the effective action distance of acid liquor is obtained by substituting the limit of reacted acid into the acid concentration and effective action distance simulated diagram, the evaluation time is short, the evaluation cost is low and a theoretical support is provided for acid fracturing design.

Description

technical field [0001] The invention relates to an evaluation method for the effective distance of acid liquid, in particular to a method for evaluating the effective distance of acid liquid based on the residual acid limit. Background technique [0002] Acid fracturing is the main technical method for carbonate reservoir reconstruction. This process is to inject acid liquid at a pressure higher than the fracture pressure of the reservoir to open fractures. The acid liquid will etch the fracture surface unevenly, and in After the pump is stopped and the pressure is relieved, the acid-etched fracture surface will not be completely closed, and an acid-etched fracture with a certain flow conductivity will be formed. Because the acid-etched fracture surface of acid fracturing has high conductivity, low net pressure, small fracture height growth, no screenout and proppant backflow, etc., it is widely used in carbonate reservoirs. [0003] During acid fracturing of carbonate rock...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 李建辉慕立俊赵振峰李宪文陆红军卜向前李建山吕宝强何衡常笃康博李转红黄婷
Owner PETROCHINA CO LTD
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