Efficient separate-prevention separate-injection tubular pile of water injection well and construction method

Abstract

The invention discloses an efficient separate-prevention separate-injection tubular pile of a water injection well and a construction method. The efficient separate-prevention separate-injection tubular pile comprises a sand prevention tubular pile and a water injection tubular pile; the sand prevention tubular pile comprises at least two sand filtering tubes which are arranged on a casing tube from top to bottom at intervals and correspond to different oil layers respectively; sand prevention and water injection efficient packers are arranged between every two sand filtering tubes, above the uppermost sand filtering tube and below the lowermost sand filtering tube correspondingly; the water injection tubular pile comprises at least two adjustable water distributors which are arranged on an oil tube at intervals from top to bottom and correspond to different oil layers respectively; and hydraulic control layered packers are arranged between every two adjustable water distributors, above the uppermost adjustable water distributor and below the lowermost adjustable water distributor correspondingly. The sand prevention water injection tubular pile is tripped in at a time, construction time is saved, then hydraulic control pipeline pressing is conducted at a time, setting and production processes of all the packers are achieved, all the hydraulic control layered packers are deblocked, blast holes can be cleaned, water injection pressure is reduced, and fishing risks do not exist in later operation.

Description

technical field [0001] The invention relates to the technical field of downhole water injection tools for oil exploitation, in particular to a high-efficiency separation and prevention separation injection pipe string for water injection wells and a construction method. Background technique [0002] With the continuous development of water injection well technology and the demand for reservoir development, a higher level is proposed for layered sand control and layered water injection. Due to the short validity period of chemical sand control wells, sand plugging and sand burial are often caused after sand control failure, the water injection effect is poor, and the maintenance cost in the later period is high. Therefore, mechanical hanging filter sand control is often used. This process requires two steps. First, the sand control string is lowered, and then the water injection string is lowered. The construction period of this process is long and takes about three days, es...

AI Technical Summary

Problems solved by technology

There are two main problems with this type of string: one is that the water injection string of the inner pipe is relatively complicated, requiring the cooperation of multi-stage packers and setting switches to realize the setting of the Y341 packer; the other is that the construction process is cumbersome and requires many times of pressure, multiple inspections of pipes are required during maintenance, etc.

The construction process of this process is relatively cumbersome, which is not very consistent with the rapid and safe production of offshore oil fields. At the same time, when the string is salvaged in the later stage, there are often cases of sand stuck in the string, which causes major repairs and increases construction costs.

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