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Method for preventing oil-string casing of oil-water well from moving upward

A technology for oil-water wells and surface casings, which is applied in the field of oil-water well production. It can solve problems such as repeated welding between reinforcement tools and oil layer casings, damage to the oil layer casing body, and time-consuming and labor-intensive problems. , Operational safety effect

Active Publication Date: 2017-06-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge upward force exerted on the oil layer casing by the subsidence of the ground surface, the problem of repeated welding between the reinforcement tool and the oil layer casing appeared. It is also easy to cause damage to the casing body of the oil layer, which is time-consuming and labor-intensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a method for controlling the upward channeling of the reservoir casing in the Z61-6X well, and the specific steps are as follows:

[0043] Step 1: Pretreatment of reservoir casing

[0044] Pull out the production string in the oil well, set the predetermined position of the packer in the sealing string to 5m from the top of the oil layer casing, run the scraping string in the downhole casing, in the scraping string, the first tubing, tubing The variable buckle joint and the GX-T140 casing scraper are threaded sequentially from top to bottom. The casing scraper is driven by the first oil pipe to move up and down in the casing of the oil layer, scraping the inner wall of the casing 10m below the wellhead once, and repeatedly scraping the 5m up and down of the sealing well section 3 times to remove scale and dirt on the inner wall of the downhole casing Wax and other casing wall obstructions. After the scraping is completed, take out the scraping...

Embodiment 2

[0063]This embodiment provides a method for controlling the upward channeling of the oil layer casing in the J45-210 well, and the specific steps are as follows:

[0064] Step 1: Pretreatment of reservoir casing

[0065] Pull out the production string in the oil well, set the predetermined position of the sealing string packer at 5m from the top of the oil layer casing, and run the scraping string into the downhole casing. The joint and GX-T140 casing scraper are threaded sequentially from top to bottom. The casing scraper is driven by the first oil pipe to move up and down in the casing of the oil layer, scraping the inner wall of the casing 10m below the wellhead once, and repeatedly scraping the 5m up and down of the sealing well section 3 times to remove scale and dirt on the inner wall of the downhole casing Wax and other casing wall obstructions. After the scraping is completed, take out the scraping string.

[0066] Step 2: Pre-treatment of oil and water wells

[00...

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Abstract

The invention discloses a method for preventing an oil-string casing of an oil-water well from moving upward, pertaining to the oiling field of the oil-water well. The method comprises the following steps: pulling out a production pipe column of the oil-water well, carrying out scraping operation on the oil-string casing and utilizing a sealing pipe column with a packer to pack casings below the construction segment in the oil-string casing; labeling the upward-moving height of the oil-string casing of a well mouth of the oil-water well as X meter, re-defining the position spacing from the top end of the oil-string casing by X meter as the screwing-on position of the oil-string casing; labeling the height of a casing cutting machine as Y meter, utilizing the casing cutting machine to cut surface-layer casings within the range of Y meter below the screwing-on position, then cutting oil-string casings above the screwing-on position, re-machining casing threads, then sealing the oil-string casing and sealing annular space among the surface-layer casings and the oil-string casing; and releasing the packer, re-securing the oil-string casing at the well mouth, recording cutting lengths of the surface-layer casings and the oil-string casing and pulling out the sealing pipe column. The method for preventing the oil-string casing of the oil-water well from moving upward has a good preventing effect and can be used for a long time.

Description

technical field [0001] The invention relates to the field of oil production in oil-water wells, in particular to a method for controlling the upward channeling of oil-layer casings in oil-water wells. Background technique [0002] With the continuous deepening of oilfield development, some oil and water wells are affected by surface subsidence, and the oil casing casings show different degrees of upward movement, ranging in height from a few centimeters to tens of centimeters. In severe cases, the rope suspension of the oil well pumping unit is bumped Wellhead packing box; breaking or breaking the wellhead surface casing and production process; long-term reciprocating movement with the pumping unit up and down, which may easily cause fatigue and fracture of the oil layer casing; the sucker rod near the wellhead is eccentrically worn off, etc. The problem of pipe running up has seriously affected the development of the oil field, and has buried serious safety hazards for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/00E21B29/00
CPCE21B29/00E21B41/00
Inventor 刘承炜马永忠尤冬青靳利江凌飞强海萍赵广恒杨瑞起李思琪姚俊成
Owner PETROCHINA CO LTD
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