Method for releasing plugging of gas field wellbore

A gas field and wellbore technology, which is applied in the field of gas field chemistry, can solve the problems of lack of methods for gas wellbore cleaning and plugging removal, and achieve remarkable plugging removal effects, rapid gas production and oil production, and significant drop in pressure difference between oil casings

Inactive Publication Date: 2018-07-13
PETROCHINA CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems existing in the prior art that lack methods for removing scale and plugging in gas well shafts mainly based on carbonates, sulfates and corrosion products

Method used

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  • Method for releasing plugging of gas field wellbore
  • Method for releasing plugging of gas field wellbore

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preparation example Construction

[0044] The preparation method of the acidic plugging agent is as follows: According to the proportion, the organic sulfonic acid solution and the corrosion inhibitor solution are mixed and stirred for 25-35 minutes, then the drainage aid solution A is added, and the acidic blocking agent is obtained by mixing evenly.

[0045] The preparation method of the alkaline chelating agent is as follows: according to the proportion, the polyamine polyacid salt solution and the drainage aid solution B are mixed and stirred for 25-35 minutes to obtain the alkaline chelating agent.

[0046] Acidic plugging agent: at normal pressure and temperature, the organic sulfonic acid solution with a concentration of 10% to 14% by mass has a positive effect on CaCO 3 The scale dissolution rate is 82.55-92.48%, and the scale dissolution capacity is 66.04-73.98 g / L. At normal pressure and 90°C, the corrosion rate of 80S with 10% organic sulfonic acid solution is 83.44 g / (m 2 • h), after adding 1% corr...

Embodiment 1

[0049] Preparation of acid plugging agent: Take 75 parts of organic sulfonic acid solution with mass percentage concentration of 10%, 2 parts of corrosion inhibitor solution with mass percentage concentration of 0.5%, mix and stir for 25min, and then add 0.5 mass percentage concentration % of drainage aid solution A 10 parts, mixed uniformly to obtain acid plugging remover.

[0050] Preparation of alkaline chelating agent: take 80 parts of polyamine polysalt acid salt solution with a mass percentage concentration of 10%, and 15 parts of drainage aid solution B with a mass percentage concentration of 0.5%, mix and stir for 25 minutes to obtain an alkaline chelating agent mixture.

[0051]During the normal generation process of Well 1# in the gas field, the pressure difference between the oil casing and the casing is about 1MPa. figure 1 As shown, the oil-casing pressure difference gradually increased from 1.00MPa to 10.00MPa, and the gas well production increased from the init...

Embodiment 2

[0053] Preparation of acidic plugging agent: Take 78 parts of organic sulfonic acid solution with mass percentage concentration of 12%, 3 parts of corrosion inhibitor solution with mass percentage concentration of 0.5%, mix and stir for 26min, then add 0.5 mass percentage concentration % of drainage aid solution A 19 parts, mixed uniformly to obtain acid plugging agent.

[0054] Preparation of alkaline chelating agent: take 85 parts of polyamine polysalt acid salt solution with a mass percentage concentration of 11%, and 15 parts of drainage aid solution B with a mass percentage concentration of 0.5%, mix and stir for 26 minutes to obtain an alkaline chelating agent mixture.

[0055] During the normal generation process of well 2# in the gas field, the oil casing pressure difference is about 1 MPa. With the extension of production time, if figure 2 As shown, the oil-casing pressure difference gradually increased from 1.00 MPa to 4.00 MPa, and the production of the gas well i...

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Abstract

The invention provides a method for releasing plugging of a gas field wellbore. A gas field plugging releasing agent is composed of an acid plugging releasing agent and an alkaline chelating agent andis suitable for gas wells and oil wells, the acid plugging releasing agent uses an acid-salt reaction to mainly dissolve CaCO3, FeCO3, FeS and other products in the wellbore, the alkaline chelating agent uses the chelating mechanism to mainly dissolve BaSO4, CaSO4 and other acid insoluble substances in the wellbore, after plugging objects in the wellbore are subjected to plugging releasing by using the method for releasing plugging of the gas field wellbore, the gas production and the oil production are increased rapidly, the oil casing pressure difference is decreased obviously, and the plugging releasing effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of gas field chemistry, and in particular relates to a method for removing plugging in a wellbore of a gas field, in particular to a method for removing plugging in a wellbore with inorganic scale. Background technique [0002] With the development of the gas field, there are more and more production wells in the gas field. Production found that some high-yield water wells and combined production wells were severely fouled and blocked, and the maximum fouling rate was 1.91 mm / a. Normal production of gas wells. XRD (X-ray diffraction, X-ray diffraction) shows that the wellbore blockage mainly consists of CaCO 3 , BaSO 4 Isoscale and FeCO 3 , FeS and other corrosion products, energy spectrum results show that there are Ba, Ca, Fe, C, S, O and other elements in the blockage. [0003] Scaling and blockages in domestic gas wells are as follows: For example, in Sichuan high-sulfur gas wells, sulfur deposits, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06C09K8/528
CPCC09K8/528E21B37/06
Inventor 李明星刘伟李琼玮朱方辉董晓焕周明明崔熙赵晓伟张振云黄航娟
Owner PETROCHINA CO LTD
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