Method for achieving separated layer water distribution by pressure pulse

Abstract

The invention provides a method for achieving separated layer water distribution by pressure pulse, and belongs to the field of oil and gas. According to the invention, separated layer water distribution is achieved by a wellhead pressure pulse program-controlled generator and a separated layer water injection string which is equipped with an intelligent water distributor. Through the adoption of the method provided by the invention, a separated layer water distribution task can be wirelessly finished in a remotely controlled way without traditional tripping and blending, so that working time and construction cost are saved; and the method provided by the invention is an efficient and advanced separated layer water distribution method with high success rate. Meanwhile, as the wellhead pressure pulse program-controlled generator is used for generating negative pressure pulse, the method provided by the invention has the advantage that separated layer water distribution effects of three layers can be finished within half an hour without stopping a pump, being assisted by other construction operation equipment and using high pressure water as a pressure source; furthermore, the efficiency and the success rate in the prior art are further increased, and the construction cost in the prior art is further reduced.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas, and in particular relates to a method for realizing layered water distribution by using pressure pulses, which is used for layered water distribution in layered water injection wells. Background technique [0002] The patent No. 200410061228.8 discloses a method of controlling layered water distribution with pressure waves, which involves layered water distribution in oil field water injection wells. According to the number of layers that need to be distributed by water injection wells, a group of pressure waves that can receive ground pressure signals Control the position and action pressure signal codes of each setting position and action of the water distribution device, set up the program to receive and execute these signals, lower the water injection pipe equipped with the pressure control water distribution device with the above settings into the water injection well, and make the up...

AI Technical Summary

Problems solved by technology

[0005] 2. This technology requires ground equipment such as high-pressure pumps when controlling construction on site, but it is not mentioned in the manual whether the high-pressure pump is a ground water injection pump corresponding to the construction well or a cement truck specially deployed for construction

Assuming that the high-pressure pump equipment is the surface water injection pump corresponding to the construction well, if the well is not a single-well single-pump high-pressure water injection well, but a single-pump multi-well remote low-pressure water injection well, the remote pressure wave is carried out in the water distribution room of the water injection station. The control is quite cumbersome; assuming that the high-pressure pump equipment is a cement truck specially allocated for construction, it will undoubtedly increase the construction cost and construction process

[0006] 3. This technology uses high-pressure water as a pressure source, and there is a risk of regulation failure

In oilfield water injection wells, the water absorption capacity of different formations varies greatly. For layered water injection wells with low formation capacity and strong water absorption capacity, when high-pressure water acts on the wellbore, since the channel of the downhole water nozzle is connected to the formation at this time, The formation is equivalent to a drainage channel, which prevents the wellbore from being pressurized, and eventually causes difficulty in control or even failure

[0007] 4. Limited by the principle of pressure wave generation, it takes too long to use this technology to carry out pressure wave coding signal layered water distribution

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