A string and method for downhole oscillation distribution process of water injection well

Abstract

The invention discloses an underground oscillating injection distribution technique pipe string for a water injection well and an underground oscillating injection distribution method for the water injection well. The pipe string comprises an oscillating buffer and an oscillation-generating water distributor, wherein the upper end of the oscillating buffer is in threaded connection with an upper oil tube, and the lower end of the oscillating buffer is in threaded connection with an adapter connector, and is fixed by an anti-loosening pin; and the upper end of the oscillation-generating water distributor is connected with the adapter connector through a short joint, and the lower end of the oscillation-generating water distributor is connected with a lower oil tube through coupling. According to the underground oscillating injection distribution technique pipe string disclosed by the invention, a water injecting technology and a blockage-removing technology are integrated, and energy of injected water is utilized to form hydraulic oscillation pulses underground through the oscillation-generating water distributor, so that blockage of stratum nearby a well wall and stratum further from the well wall can be effectively relieved and prevented, and therefore, the purposes of testing and regulating as well as augmenting injection can be simultaneously realized, single-well cost is reduced, operation time is effectively reduced, and a water well valid period is prolonged.

Description

technical field [0001] The invention relates to an oil field production process pipe string, in particular to a water injection well downhole vibration distribution process pipe string and a method. Background technique [0002] At present, domestic conventional water injection wells are injected under hydrostatic pressure water injection for a long time, and formation blockage and pollution near the well often occur, which reduces the water absorption capacity of the formation. In order to restore the formation water injection, it is necessary to adopt high-pressure water injection methods, such as fracturing, acidification and other plugging removal process measures, which cause damage to the reservoir and increase the cost of crude oil, or use vibration methods: there are downhole ultra-vibration methods, downhole mechanical vibration methods and downhole shock wave method, etc., have achieved certain results, but the vibration methods currently used have deficiencies. Ch...

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Problems solved by technology

[0002] At present, domestic conventional water injection wells are injected under hydrostatic pressure water injection for a long time, and formation blockage and pollution in the vicinity of the well often occur, which reduces the water absorption capacity of the formation.

In order to restore the formation water injection, it is necessary to adopt high-pressure water injection methods, such as fracturing, acidification and other plugging removal process measures, which cause damage to the reservoir and increase the cost of crude oil, or use vibration methods: there are downhole ultra-vibration methods, downhole mechanical vibration methods and downhole shock wave method, etc., have achieved certain results, but the vibration methods currently used have deficiencies. Chinese patent CN 91207925.8 provides a kind of energy storage type hydraulic pulse water injector, which is an underground vibration generating device. , although the injected water can directly excite vibrations in the formation, but its structure is complicated, installation is difficult, and the device is affected by pressure and temperature in the downhole, so the reliability is low and the service life is short

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