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Ph regulation unblocking liquid used for well completion

A technology of unblocking and regulating agent, which is applied in the direction of wellbore/well components, cleaning tools, drilling compositions, etc., can solve the problems of uncontrollable unblocking time and complex on-site operation, etc., and achieve remarkable reservoir protection effect, The operation is simple and the effect of reducing well washing and other procedures

Active Publication Date: 2015-04-29
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application effect of this technology is obvious, but the on-site operation is complicated, and the unblocking time cannot be adjusted

Method used

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  • Ph regulation unblocking liquid used for well completion
  • Ph regulation unblocking liquid used for well completion
  • Ph regulation unblocking liquid used for well completion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 (mass ratio)

[0018] A kind of well completion according to the present invention is used to adjust the plugging removal technical fluid by weight percentage respectively 3.0% polymer alcohol, 2.0% formate, 3.0% biopolymer, 3.0% bio-enzyme, pH adjuster hydrochloric acid 1.0% , and the rest is water, which is prepared by stirring evenly.

[0019] Experimental results:

[0020] (1) pH value: 7

[0021] (2) The experiment of filtration loss and soaking filter cake time with plugging solution, experimental result is shown in table 2, according to the curve diagram that table 2 makes, as figure 2 .

[0022] Table 2 The relationship between filtration loss and action time

[0023] Soaking time, h

0

4

8

12

16

24

28

32

36

Filtration volumeml / 30min

7

7

7

8.4

10

13

16

28.5

28.5

[0024] (3) Reservoir pollution experiment

[0025] ...

Embodiment 2

[0042] Embodiment 2 (mass ratio)

[0043] A pH-adjusting plugging-removing fluid for well completion according to the present invention is respectively 5.0% polymer alcohol, 3.0% formate, 5.0% biopolymer, 5.0% biological enzyme, 3.0% acetic acid as a pH regulator, etc. , and the rest is water, which is prepared by stirring evenly.

[0044] Experimental results:

[0045] (1) pH value: 5

[0046] (2) The experiment of filtration loss and soaking filter cake time with plugging solution, experimental result is shown in table 5, according to the curve chart that table 5 makes, as image 3 .

[0047] Table 5 Relation table between filtration loss and action time

[0048] Soaking time, h

0

2

4

6

8

12

16

20

24

Filtration volumeml / 30min

7.2

7.2

7.4

8.6

14

18.6

26

26.5

26.8

[0049] (3) Reservoir pollution experiment

[0050] The experiment was carried...

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Abstract

The invention discloses a pH regulation unblocking liquid used for well completion, and relates to a technology for solving the problem of filter cake blocking by regulating pH value of a well completion liquid, the unblocking liquid comprises the following components by mass percentages: 3.0-5.0% of polyalcohol polyol, 2.0-3.0% of formate, 3.0-5.0% of biopolymer, 3.0-5.0% of biological enzyme, 1.0-3.0% of pH regulator and the balance of water. By regulating the pH value of the well completion liquid, the problem of filter cake blocking can be solved, and the secondary environmental pollution brought by using acidification and oxidation method to clean the filter cake can be avoided.

Description

technical field [0001] The invention relates to a plug-removing fluid for well completion in oil fields, in particular to a technology for removing filter cake clogging by adjusting the pH value of the completion fluid, avoiding the use of acidification, oxidation and other methods to remove filter cake bands. secondary environmental pollution. Background technique [0002] In recent years, the protection of low-permeability oil and gas layers during drilling and completion has been put on the agenda. More and more wells use non-perforated well completion methods, the most being the open hole completion method (including early open hole completion, later open hole completion, screen completion, and gravel packing completion, etc.). The effect of many horizontal wells completed with open holes is not good. Experience has proved that during the drilling process, the drilling fluid forms a dense mud cake on the well wall, which cannot be effectively removed during the completi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52E21B37/06
Inventor 武学芹李公让李斌郑成胜蓝强王莉萍张虹
Owner CHINA PETROCHEMICAL CORP