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Online temporary blocking acidification method for water injection well

A water injection well and acid injection technology, which is applied in the direction of earthwork drilling, wellbore/well components, and production fluid, etc., can solve the problems of high labor intensity, complicated construction process, and long construction period, so as to reduce labor intensity and improve acidification Operation effect, effect of improving construction efficiency

Inactive Publication Date: 2018-08-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During construction, a four-step treatment process is required, namely "injecting pre-fluid → injecting treatment fluid → injecting post-fluid → injecting displacement fluid" and other construction procedures, which have defects such as long construction period, high labor intensity, and complicated construction procedures.

Method used

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  • Online temporary blocking acidification method for water injection well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides an online temporary plugging acidification method for water injection wells. The inlet and outlet of the online injection equipment are respectively connected to the temporary plugging chelating acid tank 4 and the wellhead of the water injection well, and the temporary plugging chelating acid is injected into the wellhead through the online injection device. At the same time, water is injected into the wellhead through the water injection pipeline, and the temporarily blocked chelating acid and water are mixed while injecting, and then injected into the formation after being mixed in the wellbore.

[0024] In the present invention, the original water injection string is used for construction, and the online injection equipment is used to mix the temporarily blocked chelating acid and water according to a certain volume ratio while injecting, and then inject into the formation under a certain injection displacement, and carry out high-permeability...

Embodiment 2

[0027] On the basis of Example 1, this embodiment provides an online temporary plugging acidification method for water injection wells, the temporary plugging chelating acid is composed of the following mass percentages: hydrochloric acid 25-35%, hydrofluoric acid 30-40% %, acetic acid 10-20%, quaternary ammonium salt gemini surfactant 6-10%, inorganic salt 1-3%, corrosion inhibitor 1-2%, and the rest is water.

[0028] The preparation process is:

[0029] Add the formulated amount of water into the reactor, and then add the formulated amount of hydrochloric acid, hydrofluoric acid, acetic acid, quaternary ammonium salt type gemini surfactants, inorganic salts, and corrosion inhibitors into the reactor in sequence, each time a component is added Stir for 15-20 minutes to fully mix the components. After adding all the components, stir for 25-35 minutes to obtain the temporary blocking chelating acid.

[0030] In this embodiment, the mixing volume ratio of the temporary blockin...

Embodiment 3

[0035] On the basis of Example 2, this embodiment provides an online temporary plugging and acidification method for water injection wells. The temporary plugging chelating acid is composed of the following mass percentages: 30% hydrochloric acid, 35% hydrofluoric acid, 15% acetic acid %, quaternary ammonium salt gemini surfactant 8%, inorganic salt 2%, corrosion inhibitor 1%, and the rest is water.

[0036] The preparation process refers to Example 2.

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Abstract

The invention provides an online temporary blocking acidification method for a water injection well. An inlet and an outlet of an online injection device are separately connected with a temporary blocking chelating acid tank and a wellhead of an injection well, temporary blocking chelating acid is injected into the wellhead through the online injection device, water is simultaneously is injected into the wellhead through a water injection pipeline, the temporary blocking chelating acid and the water are mixed during injecting, and after the temporary blocking chelating acid and the water are mixed in a wellbore, the mixture is injected into stratum. The online temporary blocking acidification method for the water injection well can improve the transformation strength of a low-permeabilitylayer in reservoir stratum with serious interlayer heterogeneity, the acidification operation effect is improved, the construction process is reduced, the labor intensity is reduced, the constructionefficiency is greatly improved, and the goal of online temporary blocking acidification construction is achieved. The viscosity of pure acid liquor of the temporary blocking chelating acid at room temperature is less than 30mPa.s. When the concentration of the acid liquor is less than 1%, the viscosity of an acid system is less than 5mPa.s, the maximum temporary blocking viscosity is adjustable, and the viscosity remains constant during acidification. A blocking remover is not required, Self-hydration for block removal can be carried out, and no damage is caused to the stratum.

Description

technical field [0001] The invention belongs to the technical field of water injection well acidification, and in particular relates to an online temporary plugging acidification method for water injection wells. Background technique [0002] At present, during the development of low-permeability reservoirs in domestic oilfields, after a period of water injection development, problems such as water injection capacity decline and formation pollution in perforation sections often occur. For reservoirs with serious interlayer heterogeneity, low-permeability Pollution removal is particularly important. [0003] In response to this problem, the commonly used augmentation measures are temporary plugging and acidizing to remove plugging. However, the conventional temporary plugging and acidizing is severely corroded during the acidizing operation. In order to avoid leakage and fracture of the tubing, the production string must be lowered. Special acidizing The pipe string can be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 宋昭杰姚斌巨亚锋张随望陆小兵王勇隋蕾王尔珍邓志颖熊小伟
Owner PETROCHINA CO LTD
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