Pad acid liquid and pad acid sand fracturing method

A technology of sand fracturing and pre-acid, which is applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve problems such as incomplete gel breaking effect, affect productivity, reduce fracture conductivity, etc., and achieve improved Effect of fracturing and improvement of connectivity

Active Publication Date: 2008-09-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel-breaking effect of hydraulic fracturing cross-linked guar gum is not complete, and the formed fracturing fluid filter cake reduces the seepage capacity between the formation and the propped fracture, and the residual glue in the propped fracture reduces the conductivity of the fracture, thus affecting production capacity

Method used

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  • Pad acid liquid and pad acid sand fracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Taking the pre-acid-sand fracturing of Well Yuan 25-20 in Bai 216 area as an example, it will be described in detail.

[0031] Bai 216 area, Yuan 25-20 well Yuan 25-20 pre-acid sand fracturing pre-acid acid fluid component weight percentage: hydrochloric acid, 1.0%; acetic acid, 6.0%; formic acid, 2.0%; CF-5C, 0.5% ; Citric acid, 0.1%; HJF-94, 1.0%; COP-1, 0.3%; the rest is water. Formulated 21m 3 spare.

[0032] In the Bai 216 area, well Yuan 25-20 uses pre-acid acid fluid for pre-acid sand fracturing process:

[0033] A. Pre-acid preparation process:

[0034] Prepare an acid-resistant tank and clear water, add configuration materials in the acid-resistant tank according to weight percentage, and stir evenly under normal temperature and pressure to obtain a pre-acid solution.

[0035] B. The pre-acid sand fracturing process is:

[0036] Base fluid low replacement → pre-acid low replacement → setting seal → pre-acid fracturing → spacer fluid → gel sand f...

Embodiment 2

[0045]Embodiment 2: the difference between embodiment 2 and embodiment 1 is: the weight percent of each component of pre-acid acid solution: hydrochloric acid, 1.4%; Acetic acid, 7.0%; Formic acid, 1.5%; CF-5C, 0.6%; Lemon Acid, 0.11%; HJF-94, 1.1%; COP-1, 0.3%; the rest is water.

[0046] The pre-acid liquid preparation and pre-acid sand fracturing process in Example 2 are basically the same as those in Example 1.

Embodiment 3

[0047] Embodiment 3: the difference between embodiment 3 and embodiment 1 is: the weight percentage of each component of the pre-acid acid liquid for pre-acid and sand fracturing: hydrochloric acid, 1.5%; acetic acid, 5.0%; formic acid, 1.8%; CF-5C, 0.6%; citric acid, 0.11%; HJF-94, 0.95%; COP-1, 0.3%; the rest is water.

[0048] The preparation of the pre-acid solution and the pre-acid sand fracturing process in Example 3 are basically the same as those in Example 1.

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Abstract

The invention relates to a front acid liquid, which is applied to the oil well front acid sand fracturing. The invention is characterized in that the front acid liquid comprises the components by the weight percentages as follows: chlorhydric acid 1.0 to 2.0 percent; acetic acid 4.0 to 8.0 percent; formic acid 1.0 to 2.0 percent; CF-5C 0.4 to 0.7 percent; citric acid 0.08 to 0.12 percent; HJF-94 0.95 to 1.15 percent; COP-1 0.3 to 0.5 percent; clean water for the other. Through the front acid sand fracturing processing of the invention, the connectedness between the container rock and the crevasse and between the inner parts of the crevasses can be improved, therefore the connectedness between the container rock and the mineshaft, and the fracturing can be enhanced to improve the effect of the oil well.

Description

technical field [0001] The invention relates to the technical field of downhole operations for oil field development, in particular to an oil well fracturing technology, which is a pre-acid sanding fracturing technology for improving single well production. Background technique [0002] At present, the use of matrix acidizing in oil wells can remove the pollution near the wellbore and improve the connectivity between the reservoir and the wellbore. Because the acid solution evenly dissolves the rock, it is difficult to form an effective conductivity after the fracture is closed, and it is difficult to improve the production of a single well by implementing acid fracturing technology for low-permeability sandstone reservoir stimulation in sandstone reservoirs. Therefore, sandstone acidizing and acid fracturing is generally used to remove plugging in the near-wellbore area, and the effect of single acidizing and acid fracturing technology in low-permeability sandstone reservoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72E21B43/27
Inventor 徐永高赵振峰李宪文赵文陆红军陈宝春唐梅荣张燕明李建山薛小佳
Owner PETROCHINA CO LTD
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