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A self-generated hydrochloric acid acidizing method suitable for carbonate reservoirs

A carbonate rock reservoir, hydrochloric acid technology, applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems affecting the effect of acidification, increasing the difficulty of construction, etc., to reduce corrosion, The effect of increasing yield and reducing the use of additives

Active Publication Date: 2017-12-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common point of these two patents is to inject the mixed solid phase suspension into the formation. During the construction process, the solid phase injection will inevitably increase the difficulty of construction. At the same time, it is necessary to add polymers to suspend the solid phase particles. After polymer injection Residues in the reservoir can also affect the effectiveness of acidification

Method used

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  • A self-generated hydrochloric acid acidizing method suitable for carbonate reservoirs
  • A self-generated hydrochloric acid acidizing method suitable for carbonate reservoirs
  • A self-generated hydrochloric acid acidizing method suitable for carbonate reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Taking marble slabs as an example to carry out indoor simulation experiments will be described in detail.

[0025] (1) Preparation of Agent A, add 100ml of water and 500g of chloroacetic acid to the beaker, stir evenly to obtain Agent A chloroacetic acid solution;

[0026] (2) Preparation of Agent B, add 90ml of water, 10ml of butyl glycol ether, and 500g of phenol into the beaker, and wait until the phenol is completely dissolved to obtain Agent B phenol liquid;

[0027] (3) The fracturing fluid is 0.4% guar gum solution, the displacement fluid is 3% KCl solution, and the base fluid is 3% NH 4 Cl solution.

[0028] Two marble slabs of the same size were used for the experiment. The size of the slabs was 10cm╳5cm╳2cm. The slabs were added to the core holder, and the simulation experiment was carried out at a temperature of 90°C and a confining pressure of 10MPa, according to " Injecting base fluid→injecting fracturing fluid→injecting agent A→injecting ag...

Embodiment 2

[0029] Embodiment 2: Taking marble slabs as an example to carry out indoor simulation experiments will be described in detail.

[0030] (1) Preparation of Agent A, add 100ml of water and 500g of chloroacetic acid to the beaker, stir evenly to obtain Agent A chloroacetic acid solution;

[0031] (2) Preparation of Agent B, add 90ml of water, 10ml of butyl glycol ether, and 500g of phenol into the beaker, and wait until the phenol is completely dissolved to obtain Agent B phenol liquid;

[0032] (3) The fracturing fluid uses 0.4% guar gum solution.

[0033] Two marble slabs of the same size were used for the experiment. The size of the slabs was 10cm╳5cm╳2cm. The slabs were added to the core holder, and the simulation experiment was carried out at a temperature of 90°C and a confining pressure of 10MPa, according to " Injecting base fluid→injecting fracturing fluid→injecting agent A→injecting agent B→injecting displacement fluid→closing the outlet of the acid solution for 2 hour...

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Abstract

The invention discloses a self-generated hydrochloric acid acidification method suitable for carbonate rock reservoir. The self-generated hydrochloric acid acidification method sequentially comprises the following steps: (1) adding water and chloroacetic acid into a liquor preparation tank in a mass ratio of (1-8) to 1, and uniformly mixing to obtain an A-agent chloroacetic acid solution; (2) adding phenol, ethylene glycol butyl ether and water into the liquor preparation tank in a mass ratio of (1-8) to (0.1-1) to 1, thereby obtaining B-agent phenol liquor when phenol is completely dissolved; (3) injecting a fracturing fluid into reservoir under high pressure for cracking stratum; (4) firstly injecting the agent A into the carbonate rock reservoir; (5) injecting the agent B into the carbonate rock reservoir, wherein a mass ratio of the chloroacetic acid to the phenol is 1 to 1; and (6) injecting a displacing liquid into shaft, and injecting the agent B in the shaft into the deep part of the reservoir. The self-generated hydrochloric acid acidification method can effectively improve deep penetrating power of acid liquor to the carbonate rock reservoir, so that the deep part of the reservoir can be modified, and oil and gas field output is improved.

Description

technical field [0001] The invention relates to the field of acidification transformation of carbonate rock reservoirs, in particular to an authigenic hydrochloric acid acidification method suitable for carbonate rock reservoirs. Background technique [0002] Acidizing or acid fracturing is the main production stimulation measure for carbonate rock reservoirs. The method is to inject acid liquid into the formation to dissolve the mineral composition of the reservoir rock and to block the reservoir during drilling, completion, workover and oil production operations. Substances can improve and enhance the permeability of reservoirs, thereby increasing the productivity of oil and gas wells. Its mechanism of action is that after HCl enters the reservoir, it reacts chemically with the rock wall, and the mineral mainly involved in the reaction is calcite (CaCO 3 ) and dolomite (CaMg(CO 3 ) 2 ), the reaction equation is: [0003] CaCO 3 +2HCl=CaCl 2+ CO 2 +H 2 o [0004] (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/28E21B37/06C09K8/72
CPCC09K8/72E21B37/06E21B43/28E21B43/283
Inventor 杜娟郭建华刘平礼赵立强李凤王春雷冉进喜陈薇羽万亭宇
Owner SOUTHWEST PETROLEUM UNIV