Electric sealing method of bridge type eccentric dispensing

Abstract

The invention relates to an electric seal examining method for a bridge eccentric separated injection tubular column. The method mainly comprises the steps of assembling an electric seal examining ground system and an electric seal examining instrument at the site; closing a wellhead water injection valve; feeding the electric seal examining instrument into a bridge eccentric separated injection shaft by a cable through a blowout prevention pipe until being above a seal examining target layer; sending an instruction to open a locating detent through a ground controller; slowly feeding the electric seal examining instrument to but with a bridge eccentric water distributor; sending a packing instruction through the ground controller to pack a sealing section into a central channel of the bridge eccentric water distributor; continuously performing opening, closing and opening at a wellhead to enable the change on the water injection pressure; observing the change conditions of water injection pressure in an oil pipe and the pressure of the stratum layer at the water injection section as measured by an upper pressure meter and a lower pressure meter under the monitoring of the ground controller, so as to determine the sealing condition of a packer. The method is mainly used for examining the sealing of the supported packer of the bridge eccentric separated injection tubular column; the sealing performance of each packer can be verified by layers by one logging.

Description

technical field [0001] The invention relates to an electric seal inspection method suitable for bridge-type eccentric injection for layered water injection in the petroleum industry. Background technique [0002] At present, in the process of layered water injection development of multi-layer reservoirs in various oilfields, bridge-type eccentric injection strings are generally used. Bridge-type eccentric injection string mainly includes packer, bridge-type eccentric water distributor, water well two-way anchor, double ball seat, screen pipe, plug, etc., among which the packer is an important part of the injection string in the oilfield water injection well. This tool is mainly used to separate different water injection intervals to meet the different injection requirements of each interval. If the seal of the packer is not tight, it will lead to abnormal water distribution in the injection interval, distortion of test data, and short validity period of injection, which will...

AI Technical Summary

Problems solved by technology

[0003] One is to use steel wire to lift and lower the operation. When checking the seal, the pressure difference between the upper and lower sides of the sealing section is large, and it is difficult to release the pressure from the upper and lower sides of the sealing section. The section leather cup is also very easy to pull over, break or fall off, it is difficult to ensure the reliability of the setting seal, which affects the success rate of the first-time seal inspection

[0004] The second is that the sealing section of the seal inspection instrument is set in the center channel of the working cylinder of the bridge-type eccentric water distributor relying on the combined action of the gravity of the upper instrument and the pressure of the water column. The success rate of setting is low, the sealing reliability is poor, and the safety risk is large.

[0005] The third is that the pressure gauge installed on the seal inspection instrument is a storage type pressure gauge. The seal inspection data measured downhole cannot be read directly in real time. low, work efficiency is not high

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