Turning foamed acid for heterogeneous reservoir acidification

A technology of heterogeneous reservoir and foam acid, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of difficult flowback, difficulty in reasonable placement, and high acid consumption.

Inactive Publication Date: 2014-06-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the actual acidizing process, due to the heterogeneity between layers and layers, the conventional acid liquid preferentially enters the hyperpermeable layer with the least resistance, and the acid liquid concentrates on the high-permeability layer and cannot improve the low-permeability layer or has pollution. Second, the penetration distance of acid liquid is small, and the pollution in the depth of the reservoir is difficul...

Method used

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  • Turning foamed acid for heterogeneous reservoir acidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Prepare a certain concentration of WT-60A to simulate the reaction process of the acid solution in the formation acid rock. As the concentration of the acid solution decreases, a large amount of calcium ions (or magnesium ions) are produced, and the system is cross-linked to increase the viscosity. The experimental results are shown in Table 1:

[0010] Table 1 Viscosity of Surfactant Acid with Different Concentrations of Residual Acid (30°C)

[0011] Surfactant formulations with different residual acid concentrations

Embodiment 2

[0013] Prepare 100ml of this foam acid solution, stir it at a speed of 1000r / min for 1min, and see the following table for the foam half-life and foam quality measured at 30°C:

[0014] The performance measurement of table 2 foam acid

[0015]

Embodiment 3

[0017] Prepare foam acid 2% WT-60A+10% hydrochloric acid (stirring at 1000r / min for 1min) and 100ml of 10% hydrochloric acid respectively, put the weighed marbles into the two liquids respectively, and react at 30°C for 5min, experiment Data are as follows:

[0018] Table 3 foam acid retardation test data

[0019]

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Abstract

The invention relates to a turning foamed acid for heterogeneous reservoir acidification. The turning foamed acid comprises, by volume, a nitrogen gas phase, 10% of hydrochloric acid, 1.5-3% of hydrofluoric acid, 2WT-60A, 2% of a corrosion inhibitor and 0.5% of citric acid. The 2WT-60A is cocoalkanoylamido propyl betaine or dodecyl dimethyl betaine. After the turning foamed acid is stirred at a stirring rate of 1000r/min for 1min, a foam half-life period is about 91min and form mass is 61.5% of the original mass. The turning foamed acid has the characteristic of self-tackifying, is free of a cross-linking agent and a gel breaker, controls a self-turning function based on a pH value, and has good diffluence performances, good retardance and high flowback performances.

Description

technical field [0001] The invention is a diverting foam acid, which has good retarding performance of the acid solution, and the acid solution has the characteristic of self-increasing viscosity and diverting as the acid-rock reaction proceeds, and is suitable for acidizing operations of heterogeneous reservoirs. Background technique [0002] In the actual acidizing process, due to the heterogeneity between layers and layers, the conventional acid liquid preferentially enters the hyperpermeable layer with the least resistance, and the acid liquid concentrates on the high-permeability layer and cannot improve the low-permeability layer or has pollution. Second, the penetration distance of the acid solution is small, and the pollution in the depth of the reservoir is difficult to remove; low-permeability and low-pressure reservoirs generally have the problem of difficult flowback after acidification. In addition, compared with vertical wells, horizontal wells have a large sca...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/602C09K2208/32
Inventor 袁飞吴丽蓉张健强刘应根成一刘伟王斌巩加芹
Owner PETROCHINA CO LTD
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