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Wax scraper and heavy oil well washing and wax removing method

A technology of wax scraper and oil well, which is applied in wellbore/well parts, cleaning equipment, earthwork drilling and mining, etc. It can solve the problems of small contact area of ​​wax, inability to clean wax, poor dissolution and cleaning effect, etc. To achieve the effect of improving the dissolution and cleaning effect

Active Publication Date: 2017-07-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The wax precipitated in the casing is closely attached to the inner wall of the casing, and the aqueous solution of the wax dissolving agent injected into the casing has a small contact area with the precipitated wax, and the aqueous solution of the wax dissolving agent has a good effect on dissolving and cleaning the wax in the casing. Poor, and cannot clean the wax that clings to the inner wall of the casing

Method used

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  • Wax scraper and heavy oil well washing and wax removing method
  • Wax scraper and heavy oil well washing and wax removing method
  • Wax scraper and heavy oil well washing and wax removing method

Examples

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Effect test

Embodiment 1

[0039] The embodiment of the present invention provides a wax scraper 1, see figure 1 , the wax scraper 1 includes:

[0040] A connecting pipe 11, the two ends of the connecting pipe 11 are used to connect with the oil pipe; and

[0041] Wax scraper cylinder 12, wax scraper cylinder 12 comprises big end, small end and the conical surface that is used to connect big end and small end, the small end of wax scraper 1 is sleeved on the connecting pipe 11, and the big end of wax scraper cylinder 12 is used for Attached to the inner wall of the casing, the conical surface is provided with a plurality of openings 121 .

[0042] In the application of this embodiment, one end of the connecting pipe 11 close to the small end of the wax scraping cylinder 12 is connected to the oil pipe, and the other end of the connecting pipe 11 can be selected according to the actual application environment. The other end of 11 can be connected with the oil pipe in the oil well; after the connecting ...

Embodiment 2

[0052] Embodiments of the present invention also provide a method for washing and dewaxing heavy oil wells, see figure 2 and image 3 , the method includes:

[0053] S10, judging whether the distance from the wellhead of the heavy oil well to the lowermost end of the waxy section of the casing 2 in the heavy oil well is smaller than the distance from the lowermost end of the tubing 3 in the heavy oil well to the bottom of the heavy oil well;

[0054] S20, when the judgment of S10 is yes, install the wax scraper 1 as described in Embodiment 1 on the oil pipe 3 at the wellhead of the heavy oil well, and the small end of the wax scraper 1 is located above the big end;

[0055] S30, lowering the wax scraper 1 into the casing 2 along with the oil pipe 3, and scraping the wax on the wax section in the casing 2;

[0056] S40, performing circulation flushing on the heavy oil well, and pumping the wax scraped off by the wax scraper 1 out of the heavy oil well.

[0057] In this embo...

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PUM

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Abstract

The invention discloses a wax scraper and a heavy oil well washing and wax removing method, and belongs to the technical field of borehole operation. The method includes: determining if a distance from an opening of a heavy oil well to the lower end of a wax section of a sleeve in the heavy oil well is less than a distance from the lower end of an oil pipe in the heavy oil well to the bottom of the heavy oil well or not; arranging a wax scraper on the oil pipe in the opening of the heavy oil well if so, wherein a small end of the wax scraper is positioned above a large end; arranging the wax scraper into the sleeve with the oil pipe, and scraping wax from the wax section in the sleeve; and circularly washing the heavy oil well, and pumping the wax scraped by the wax scraper out of the heavy oil well. Wax attached on an inner wall of the sleeve is removed by the wax scraper, the wax is separated from the inner wall of the sleeve, an aqueous solution of a wax dissolving agent is injected into the sleeve, the contact area between the wax in the sleeve and the aqueous solution of the wax dissolving agent is enlarged, and the dissolution and cleaning effect of the wax dissolving agent for the wax can be improved.

Description

technical field [0001] The invention relates to the technical field of downhole operations, in particular to a wax scraper and a method for cleaning and dewaxing heavy oil wells. Background technique [0002] A heavy oil well is a kind of oil well that produces heavy oil. A casing and an oil pipe are arranged in the heavy oil well. The wax on the inner wall of the casing forms a waxy section. The waxy section in the casing will reduce the speed of the tubing in the casing. Carry out well washing and dewaxing to wash off the wax attached to the casing. [0003] At present, the method for flushing and dewaxing heavy oil wells is: injecting an aqueous solution of a paraffin dissolving agent into the casing to dissolve and clean the wax precipitated in the casing. [0004] In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art: [0005] The wax precipitated in the casing is closely attached to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/02E21B37/06
CPCE21B37/02E21B37/06
Inventor 韩文华毕文杰吴东国李海军赵正勋赵亚峰叶振忠郑智腾
Owner PETROCHINA CO LTD