Clean steering acid liquid system for acidification and preparation method thereof

A sour and clean technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as low flowback rate, difficult flowback, reduction of reservoir permeability and fracture conductivity, and achieve acid The effect of low liquid viscosity and simple preparation process

Active Publication Date: 2014-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The diverting acid acidizing systems developed earlier are all polymer systems, which have two major disadvantages: First, due to incomplete gel breaking, viscous fluid stays in the formation and fractures, resulting in difficult flowback, and the flowback rate is generally low , only about 35%-65%; the second is that the polymer system forms a filter cake in the formation, which blocks the pore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh the components (g) according to the following weights:

[0050] Solution A includes the following components:

[0051] 31% hydrochloric acid solution: 52g; iron ion stabilizer TWJ-101.0g; corrosion inhibitor: 1.5g; surfactant 1.5g; KCl3g; water 41g;

[0052] Solution B includes the following components:

[0053] Gel breaker 12g; water 88g.

[0054] A method for preparing a clean steering acid system, the method comprising:

[0055] Prepare solution A:

[0056] (1) Add 42g of water to the reaction vessel;

[0057] (2) Add 1.5g of surfactant to the reaction vessel while stirring, and stir for 1 minute to make it evenly mixed;

[0058] (3) Add 1.0g of iron ion stabilizer, 1.5g of corrosion inhibitor, and 3g of KCl to the solution in the reaction vessel, and stir evenly;

[0059] (4) Add 51g of 31% hydrochloric acid solution to make solution A;

[0060] Prepare Solution B:

[0061] (1) Add 88g of water into the reaction vessel;

[0062] (2) Add 12g of mutual ...

Embodiment 2

[0064] Weigh the components (g) according to the following weights:

[0065] Solution A includes the following components:

[0066] 31% hydrochloric acid solution: 71g; citric acid 2.0g; corrosion inhibitor: 2.0g; surfactant 2.0g; NH 4 Cl4.0g; water 19g;

[0067] Solution B includes the following components:

[0068] Mutual solvent 15g; water 85g.

[0069] A method for preparing a clean steering acid system, the method comprising:

[0070] Add 19g of water to the reaction vessel, add 2.0g of surfactant, stir evenly, add NH 4 Cl4.0g, corrosion inhibitor 2.0g, iron ion stabilizer 2.0g, finally add 31% hydrochloric acid solution 71g to it to make solution A; add mutual solvent 15g to 85g water to make solution B.

Embodiment 3

[0072] Weigh the components (g) according to the following weights:

[0073] Solution A includes the following components:

[0074] 31% hydrochloric acid solution: 32g; iron ion stabilizer TWJ-100.5g; corrosion inhibitor: 0.5g; surfactant 1.0g; NH 4 Cl3.0g; water 63g;

[0075] Solution B includes the following components:

[0076] Mutual solvent 8g; water 92g.

[0077]Add 63g of water to the container, add 1.0g of surfactant, stir evenly, add NH 4 Cl3.0g, corrosion inhibitor 0.5g, iron ion stabilizer 0.5g, and finally add 31% hydrochloric acid solution 32g to it to make solution A; add mutual solvent 8g to 92g water to make solution B. Example 4

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Abstract

The invention discloses a clean steering acid liquid system for acidification and a preparation method thereof. The clean steering acid liquid system comprises a solution A and a solution B, wherein the solution A comprises the following raw materials in parts by weight: 32-71 parts of 31% hydrochloric acid solution, 0.5-2.0 parts of ferric ion stabilizer, 0.5-2.0 parts of corrosion inhibitor, 1.0-2.0 parts of surfactant, 3.0-4.0 parts of clay stabilizer, and 19-63 parts of water; the solution B comprises the following raw materials in parts by weight: 8-15 parts of mutual solvent and 85-92 parts of water. The preparation method comprises the following steps: adding the surfactant to a container containing water; evenly agitating, and then adding the clay stabilizer, the corrosion inhibitor and the ferric ion stabilizer; finally adding the hydrochloric acid solution, so as to prepare the solution A; and adding the mutual solvent to the container containing water, so as to prepare the solution B for gel breaking of the clean steering acid liquid system. By adopting the acid liquid system disclosed by the invention, the formula is simple in component, good in steering effect, and free of damage to a reservoir, and controls the self-steering function.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a clean diverting acid liquid system and a preparation method thereof. Background technique [0002] The diverting acid acidizing systems developed earlier are all polymer systems, which have two major disadvantages: First, due to incomplete gel breaking, viscous fluid stays in the formation and fractures, resulting in difficult flowback, and the flowback rate is generally low , only about 35%-65%; the second is that the polymer system forms a filter cake in the formation, which blocks the pore space of the formation and supporting fractures, and reduces the permeability of the reservoir and the conductivity of the fractures. In addition, the system also has limitations such as poor steering effect and complicated process, making it difficult to achieve the expected transformation goals. [0003] The clean steering acid developed in recent years is a new polymer-free acid s...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/74C09K2208/26C09K2208/30C09K2208/32
Inventor 吕小明赵振峰李宪文丁里马旭石华强尹晓宏李小玲凌云赵倩云叶亮李红英古永红
Owner PETROCHINA CO LTD
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