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Repairing method for damaged casing pipe of oil-water well

A repair method and oil-water well technology, which is applied in earthwork drilling, wellbore/well components, cleaning tools, etc., and can solve the problems of oil-water well scrapping, difficult repair, casing cracking and deformation, etc.

Active Publication Date: 2016-10-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For casings with large damaged lengths, especially oil-water wells with damaged casings exceeding 20m, due to the relatively long length of the part to be repaired and the relatively small pressure bearing capacity of the part to be repaired, the repair is difficult. During construction operations such as cracking, it is also easy to cause cracking and deformation of the casing, which in turn leads to the scrapping of the oil and water well

Method used

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  • Repairing method for damaged casing pipe of oil-water well
  • Repairing method for damaged casing pipe of oil-water well

Examples

Experimental program
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Effect test

Embodiment 1

[0093] The embodiment of the present invention provides a method for repairing damaged casings of oil and water wells, which is suitable for repairing casings with a damaged length exceeding 20m. See figure 1 , the repair method for oil and water well casing damage includes:

[0094] Step 101: Wellbore preparation: pulling out the production string in the well; measuring the casing damage position.

[0095] Step 102: Scraping the casing: Run the scraper from the wellhead to scrape to a predetermined distance below the design subsidy position. The design subsidy position is the casing damage position extending 5-10m up and down along the axial direction of the casing, and each scraping is about 1000m , flush the wellbore once with clean water, the amount of clean water ≥ 1.5 times the volume of the wellbore, if there is dead oil in the wellbore, then increase the well flushing 3 to 4 times, when scraping to the design subsidy position, repeat the scraping 3 times, and scrape to...

Embodiment 2

[0113] The embodiment of the present invention provides a method for repairing damaged casings of oil and water wells, which is suitable for repairing casings with a damaged length exceeding 20m. See figure 2 , the method includes:

[0114] Step 201: Borehole preparation.

[0115] Specifically, it may include: measuring the damaged position of the casing;

[0116] Among them, measuring the damaged position of the casing may include:

[0117] According to the geological data, the running depth, wall thickness and deformation section of oil and water well casings are checked and corrected in detail;

[0118] Use instruments and tools to accurately measure the location of casing damage;

[0119] Pull out all the pipe strings and tools in the well, accurately measure the length of the pipe string entering the well on the ground, and accurately measure the location of the casing damage.

[0120] When implemented, the instruments and tools may be turbine flow meters. On the on...

Embodiment 3

[0163] The embodiment of the present invention provides a method for repairing casing damage in oil and water wells. In this embodiment, well H16 Ping 3 is taken as an example for illustration. The H16 Ping 3 casing damage section is 1780m-1850m, a total of 70m. The method includes:

[0164] 1. Wellbore preparation

[0165] A. According to the geological data, check and correct the running depth, wall thickness and deformation section of the oil and water well casing in detail;

[0166] B. Use instruments and tools to accurately measure the location of casing damage;

[0167] C. Pull out all the pipe strings and tools in the oil and water well, open the channel, repair the deformed section, and restore the diameter of the casing;

[0168] D. Accurately measure the length of the pipe string on the ground, and accurately measure the damaged position of the casing.

[0169] 2. Scraping casing

[0170] Lower the spring-type scraper from the wellhead of the oil-water well, scrap...

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Abstract

The invention discloses a repairing method for a damaged casing pipe of an oil-water well and belongs to the field of oil production engineering of oil industry. The method comprises the following steps: preparing a well: taking a production tubular column out of the well; measuring the damaged position of the casing pipe; scraping the casing pipe: inserting a scraping instrument from the space under the well and scraping for a preset distance under a design repairing position; pigging; inserting into a repairing tubular column of an expansion pipe: connecting the repairing tubular column of the expansion pipe from well, wherein the repairing tubular column of the expansion pipe comprises an expanding repairing tubular column, an expander connecting rod, a dustproof component and a phi 73mm external thickening oil tube tubular column from bottom to top; pressing the repairing tubular column of the expansion pipe; testing pressure; salvaging bottom blockage, thereby realizing the repairing for the casing pipe with damaged length exceeding 20m. When the repairing method provided by the invention is used for repairing the casing pipe of the oil-water well with damaged length exceeding 20m, the success rate reaches 100% in more than 10 times of well applications.

Description

technical field [0001] The invention belongs to the field of oil recovery engineering in the petroleum industry, and in particular relates to a repair method for damaged casings of oil and water wells. Background technique [0002] Oil and water well casings are widely used in oil well drilling, and are mainly used to support the well wall during drilling and after well completion, so as to ensure the drilling process and the normal operation of the entire oil well after well completion. Due to the different geological conditions, the downhole stress state is complex, and the tensile, compressive, bending and torsional stresses act comprehensively on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well, or even scrap it. [0003] Studies have shown that the causes of casing damage are mainly geological and engineering. Through ...

Claims

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Application Information

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IPC IPC(8): E21B29/10E21B37/00E21B31/00
Inventor 付亚荣刘春平马永忠尤冬青张志明李小永靳利强海萍刘承炜江凌飞李冬青古秋蓉祝庆山付亚秀刘素格
Owner PETROCHINA CO LTD
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