Casing Subsidy Layered Water Injection String

Abstract

The invention discloses a casing repaired separate layer water injection string. An upper water injection layer and a lower water injection layer are communicated with a casing; the casing is provided with a damaged section; the damaged section is positioned between the upper water injection layer and the lower water injection layer; a repairing pipe is driven into the damaged section of the casing; a seal cartridge is arranged in the repairing pipe first and then is installed in the casing together with the repairing pipe; an outer layer water injection pipe is installed in the casing; an outer annular channel is formed between the casing and the outer layer water injection pipe; the lower part of the outer layer water injection pipe is positioned above the repairing pipe; an inserting seal pipe is connected to the lower part of an inner layer water injection pipe, and then the inserting seal pipe, together with the inner layer water injection pipe, is installed in the outer layer water injection pipe; an inner annular channel is formed between the outer layer water injection pipe and the inner layer water injection pipe; the inserting seal pipe is inserted into the seal cartridge and is matched with the seal cartridge for sealing; the inner layer water injection pipe, the inserting seal pipe and the lower water injection layer are communicated, and the upper water injection layer and the lower water injection layer are separated, so that separate layer water injection is realized, the requirement on separate layer water injection development of oil field is met, the oil field developing effect can be improved and the obvious economic benefit is achieved.

Description

technical field [0001] The invention is an oil field water injection pipe string, which is a layered water injection pipe string which is lowered after the casing is subsidized at the damaged part of the casing, in particular a casing subsidized layered water injection pipe string. Background technique [0002] After years of water injection development in water injection wells, many casings have problems such as damage and deformation. After these problems occur, it is necessary to use the casing subsidy method to subsidize the casing rupture to prevent casing leakage. The casing subsidy is to put the plugging pipe under the casing rupture, and pour mud between the casing and the plugging pipe After the mud is solidified, the casing and the plugging pipe are consolidated into one, so that the rupture of the casing is repaired and the water injection well can be produced normally. Since the inner diameter of the casing becomes smaller after subsidized, ordinary layered wate...

AI Technical Summary

Problems solved by technology

Ordinary layered water injection tools cannot be used due to the smaller inner diameter of the casing subsidized

Therefore, casing subsidized wells cannot perform layered water injection, which affects oilfield water injection and oil recovery

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