Separate zone production technical string capable of protecting oil reservoirs

Abstract

The invention relates to a separate zone production technical string capable of protecting oil reservoirs. The separate zone production technical string consists of a pumping string and an oil reservoir protecting releaser string. The oil reservoir protecting releaser string consists of a plug (4), an oil reservoir protector (9), a safety joint (8), a Y341 type self-examining packer (10), a Y441 type packer (6) and a releaser head (5) which are fixedly connected from bottom to top. A pumping string switch (11) is plugged into the oil reservoir protector (9) of the oil reservoir protecting releaser string and can be used for opening any production layers, and is convenient to switch on and switch off accurately. The string is simple, reasonable, convenient and practical in structural design, and can close a stratum without well killing during pump inspection, prevent flushing fluid or well killing fluid from entering the oil reservoirs to pollute the same and protect the oil reservoirs, and accordingly production efficiency can be increased, effective production periods of the oil reservoirs are prolonged, any oil reservoir can be opened during oil well production, and zone replacement production of oil well can be achieved without removing the jammed releaser string.

Description

technical field [0001] The invention relates to a layered oil recovery process string during oil well production in an oil field, in particular to a layered oil recovery process string used for protecting oil layers during pump inspection operations in low-energy oil wells. Background technique [0002] At present, most of the old blocks and some newly developed blocks in the oilfield have low formation energy. After the well killing operation, the killing fluid will pollute the oil layer, and the recovery period of the oil well will be long. The productivity of the recovered oil well will be greatly reduced, which directly affects the production of the oil well. [0003] For oil layer protection in operation, chemical methods are mostly used at present, which are realized by improving the performance of killing fluid, but due to high price and high cost, it is still difficult to popularize. [0004] With the deepening of oilfield development, the formation conditions are be...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problem that the oil layer cannot be protected on the basis of the mechanical layered oil recovery production string, the present invention provides a layered oil recovery production process string for protecting the oil layer, which can not only seal the formation during the pump inspection operation, but also realize the non-stop during the pump inspection process. Well killing operation, avoiding well cleaning fluid or well killing fluid from entering the oil layer to pollute the oil layer, protecting the oil layer, improving the production time rate, reducing the cost, and prolonging the effective production period of the oil layer; it can also close or open any oil layer when the oil well is in production, so that the oil well does not Exploitation of moving sticking layer, throwing pipe string and changing layer

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