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Well-repairing process for casing deformed oil and water well

A process method and oil-water well technology, applied in wellbore/well components, earthwork drilling, production fluid, etc., can solve the problems of complex construction process, application influence, long construction period, etc., to shorten the construction period, increase the injection rate, The effect of saving workover cost

Inactive Publication Date: 2008-02-13
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Claims
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AI Technical Summary

Problems solved by technology

Because these technologies are limited by specific well conditions, and the construction process is complex and the construction period is long, it is not economically reasonable, so that its application is affected. In practice, oil field development and production need to develop casing variable wells that can overcome the above-mentioned deficiencies. Repair process

Method used

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  • Well-repairing process for casing deformed oil and water well

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Embodiment Construction

[0024] Describe below in conjunction with accompanying drawing.

[0025] As shown in the figure: the gravel packing sand control string used in the present invention is composed of thickened oil pipe 1, filling device 2, signal nipple 3, high pressure packing sand control screen 4, centralizer 5, and plug 6 from top to bottom. The well condition tubing string can be one of the following three assembly structures from bottom to top:

[0026] Top filling: plug + tubing pup without coupling + sand control screen without coupling + tubing pup without coupling + safety joint without coupling + signal screen + tubing pup without coupling + top filling device + tubing

[0027] Bottom filling: plug + tubing pup without coupling + bottom filling device + sand control screen without coupling + tubing pup without coupling + safety joint without coupling + signal screen + tubing pup without coupling + packing device + tubing

[0028] No filling: plug + tubing pup without coupling + sand...

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Abstract

The invention relates to a casing deformation oil-water well repair technics. The sand-washing technology and the anti-sand technics with a gravel-filled string are adopted by the invention. Sand is first washed to a preset position with a specially made sand-washing tool, and then the anti-sand string is put into the well. A certain amount of quartz sand is filled outside the string to complete the well. Thus, a well bore hole is reinforced and an oil flow or water injection passage is formed, so as to reach the purpose of production recovery for an oil well and water injection recovery for a water injection well. The casing deformation oil-water well repair technics provided by the invention avoids the overhaul procedure. The sand prevention work can be directly carried out, the well repair cost is reduced, and the construction period is shortened. Moreover, when the sand is effectively prevented, the intention is provided with a certain channelizing effect for an oil layer, which is favorable for increasing the oil well output or the water injection amount of the water injection well.

Description

Technical field: [0001] The invention relates to a process method for casing deformed oil and water well workover and production recovery, which belongs to the category of oil recovery workover operation process technology. Background technique: [0002] With the extension of oil field development time, many oil fields have entered the middle and late stages, and more and more oil and water wells have casing deformation and failure. At present, a variety of casing repair technologies are used on site, such as casing subsidy, casing replacement, small casing cementing and secondary completion. Because these technologies are limited by specific well conditions, and the construction process is complicated, the construction period is long, and it is not economically reasonable, so its application is affected. In practice, oil field development and production need to develop casing variable wells that can overcome the above-mentioned deficiencies. Repair process method. Invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/02E21B37/08
Inventor 张飘石廉锡金
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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