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Pipe-scraping well-washing filtering device and well-washing filtering method thereof

A filtering device and scraping tube technology, which is applied to wellbore/well components, earth-moving drilling, and fluid production, etc., can solve the problems of poor adsorption effect of strong magnetic scraping device, and the adsorption capacity cannot continue to be adsorbed, so as to improve the cleanliness. and operation timeliness, increased operation safety, and low R&D and use costs.

Pending Publication Date: 2022-05-10
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the deficiencies in the prior art. In the existing filter device, after the scraper is cleaned, the adsorption effect of the strong magnetic scraper is poor or there is a problem that the adsorption amount reaches saturation and cannot continue to adsorb. It provides a scraper cleaning Well filtering device and well cleaning and filtering method thereof, the device has a simple and reliable structure, low development and use costs, can efficiently recover iron filings, shell debris and other sundries in the wellbore while cleaning the well with the scraper tube, and improves the cleaning of the wellbore. Sex and working time

Method used

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  • Pipe-scraping well-washing filtering device and well-washing filtering method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A scraper cleaning and filtering device, comprising an overflow string 1 and a filter 2, the tail end of the overflow string 1 is integrally arranged at the head end of the filter 2,

[0026] The overflow pipe string 1 includes an inner pipe string 3 and a sealing sleeve 4, a first internal thread 5 is provided on the inner wall of the head end of the inner pipe string 3, and a grouting through hole 6 is opened on the lower side wall of the inner pipe string 3, In the grouting through hole 6, a filter plate 18 for preventing impurities from entering the inner pipe string is provided, and a filtering through hole 7 is opened on the side wall of the inner pipe string 3 above the grouting through hole 6, and the sealing sleeve 4 is slidably arranged on the on the outer wall of the inner pipe column 3, so as to realize the purpose of slidingly opening / closing the grouting through hole 6 and the filtering through hole 7;

[0027] The tail end of the filter 2 is installed wit...

Embodiment 2

[0029] On the basis of the first embodiment, an upper stop step 8 and a lower stop step 9 are sequentially provided on the outer wall of the inner pipe string 3 from top to bottom, so as to achieve the purpose of limiting the sliding displacement of the sealing sleeve 4 .

[0030] The sealing sleeve 4 includes a slider 10 and a sealing rubber 11. The slider 10 is slidably installed on the outer wall of the inner pipe string 3, and a sealing rubber 11 is arranged on the outer side of the slider 10 to realize the sealing between the outer wall of the inner pipe string 3 and the sleeve. The purpose of the annulus between the inner walls of the tube.

[0031] The number of grouting through holes 6 is three, and the angle between adjacent grouting through holes 6 is 120°.

[0032] The number of filtering through-holes 7 is three, and the included angle between adjacent filtering through-holes 7 is 120°.

[0033] The mesh number of the upper layer filter screen 14 is 50 orders, the...

Embodiment 3

[0035] On the basis of the second embodiment, the head end of the inner pipe string 3 is connected with the outer thread of the strong magnetic scraper through the first inner thread 5 .

[0036] The tail end of the one-way valve 12 is connected with the roller cone bit through the second internal thread 17 .

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Abstract

The invention provides a pipe scraping and well washing filtering device and a well washing filtering method thereof.The overflowing pipe column comprises an inner pipe column and a sealing sleeve, the inner wall of the head end of the inner pipe column is provided with a first internal thread, the side wall of the lower portion of the inner pipe column is provided with a grouting through hole, and a filtering piece is arranged in the grouting through hole; a filtering through hole is formed in the side wall, above the grouting through hole, of the inner pipe column, and the sealing sleeve is arranged on the outer wall of the inner pipe column in a sliding mode; the tail end of the filter is provided with a one-way valve used for controlling liquid to only flow from the upper part to the lower part of the filtering device, the tail end of the one-way valve is provided with a second internal thread, and the filter is internally provided with a filtering assembly. The device is simple and reliable in structure and low in research and development and use cost, scrap iron, shell scraps and other sundries in a shaft can be efficiently recycled while a pipe is scraped and a well is washed, and the shaft cleanliness and the operation time efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas production and completion, and more specifically relates to a scraper pipe cleaning and filtering device and a well cleaning and filtering method thereof. Background technique [0002] Before the well completion operation, it is usually necessary to carry out scraper cleaning operation to reduce the impurity content in the casing and improve the efficiency and safety of production operations. At present, the commonly used combination of scraper and well cleaning strings is a rotary scraper, a strong magnetic scraper and a roller cone bit from top to bottom. The rotating scraper fits in interference fit with the inner diameter of the casing, rotates to clean the inner wall of the casing, and the strong magnetic scraper absorbs fallen iron filings and other sundries. However, after several scraper washouts, the surface of the strong magnetic scraper still has a lot of iron filings, shell fragme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/02E21B37/08
CPCE21B37/02E21B37/08
Inventor 和鹏飞陈波宋峙潮万祥刘鹏飞于忠涛边杰王菲菲胡志爽郑卓
Owner CHINA NAT OFFSHORE OIL CORP
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