Method and device for repairing oil/gas drilling bushing

Abstract

The invention relates to a method for repairing drill sleeve, and a relative device, wherein it first complete the well via normal 9-5 / 8 sleeve anti-sand method, then repairs the producing sleeve that damaged; in the repair, it first inserts the repair tubes formed by connected 7 sleeves into the 9-5 / 8 producing sleeve to aim the cement section to the damaged part of said producing sleeve; then pours cement via 5 pour bowl into the cement section 4; and uses the through hole at the section to pour cement into the annular space between the repair tubes and the producing sleeve; and uses the cement umbrella at the cement section to support upper cement when the well is closed, to repair the damaged part when the cement is solidified. The invention can reduce cost and time.

Description

technical field [0001] The invention relates to a method and a device for repairing an oil and gas drilling casing. Background technique [0002] In the development process of offshore oil and gas fields, the simultaneous intensive cluster well group development operation mode is currently adopted. The so-called simultaneous intensive cluster well group development and operation mode refers to dense cluster wells on a large wellhead platform with 1.5m×1.8m wellhead spacing, 5 wells / row×7 rows, and 35 well slots on one drilling platform group development. This operation method can reduce the number of platforms and double the number of platform workover rigs, and it is also convenient for future production management and saves costs. At the same time, the dense cluster well group development operation mode is characterized by drilling operations: after intensive drilling and solidification of the 13-3 / 8” surface layer, the oil layers are drilled one by one and the productio...

AI Technical Summary

Problems solved by technology

This option is also not advisable

[0006] 3. Re-drilling two wells can solve the problem that the 9-5 / 8” production casing meets the oil volume requirements. However, there are no remaining well slots on the platform to provide drillable wellheads. Even if there are remaining well slots, the wells at this time The trough is obviously at the edge of the platform, which brings about a more serious obstacle avoidance problem for the new drilling hole. The design and control of the trajectory are both problems and more difficult; in terms of fixed costs such as casing and cement, the cost will increase by one percent. times

[0007] 4. The Casing Patch (casing subsidy or casing repair) technical scheme of expanded metal material is used to carry out the casing subsidy process, but because the casing has been cemented, there are cement blocks on the pipe wall, and the surface of the scraper cannot be removed. At the same time, the lining is subsidized The pipe gap is too small, under the condition that the inner wall of the casing cannot be guaranteed, and the dog hole is too large (up to 4.9° / 30m) in the curved well section, etc., resulting in the failure of the subsidized liner to be lowered in place

Therefore, utilize prior art to repair the bushing that is drilled through or wear by drill bit, all there is many concrete difficulties that cannot be implemented

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