Continuous oil pipe multi-layer polymer injection well washing method

Abstract

The invention relates to a continuous oil pipe multi-layer polymer injection well washing method. According to the technical scheme, one continuous oil pipe in a continuous oil pipe group is connectedwith a transition connecting pipe, one continuous oil pipe is connected with a second layer polymer injection pipe, one continuous oil pipe is connected with a second layer well washing pipe, the transition connecting pipe, the second layer polymer injection pipe and the second layer well washing pipe are connected with a second layer layering seal part through a single-pipe sealing part and a seal press-joint part, the lower end of the transition connecting pipe is connected with the first layer polymer injection pipe through a direct facing connector, the lower end of the second layer wellwashing pipe is connected with a first layer well washing pipe, the first layer well washing pipe and the first layer polymer injection pipe are connected with a first layer layering seal part througha single-pipe seal part and a seal press-joint part, and well washing valves are arranged on the lower sides of the first layer well washing pipe and the second layer well washing pipe. The method has the beneficial effects that work is simple, lowering speed is high, independent divided injection of each layer is achieved, noninterference is achieved, the polymer injection effect is improved, and the work frequency is reduced.

Description

technical field [0001] The invention relates to an integrated oil injection and well washing device, in particular to a coiled tubing multi-layer polymer injection and well washing integrated device. Background technique [0002] Coiled tubing is a non-joint coiled steel pipe made of high-strength alloy steel through special processing technology. It is wound on the drum and adopts special injection equipment. It can be continuously lowered into the well or pulled out from the oil well. A long oil pipe without thread connection , can solve problems that cannot be solved by conventional operation methods, and is favored by users for its high efficiency, practicality and economy. Coiled tubing can be used in various fields such as workover, well completion, well logging, pipeline gathering and transportation, etc. It can perform multiple operations such as paraffin removal, acidification, cement extrusion, well killing, perforation, horizontal well drilling, old well window si...

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Problems solved by technology

[0003] However, due to the particularity of coiled tubing, at present, the use of coiled tubing is only on single-layer, on double-layer and multi-layer, because there are difficulties in the sealing between layers, so it has not been achieved for a long time. application, especially in multi-layer polymer injection

[0004] At present, in oil field production, polymer injection wells are injected with water after polymer injection, the ultimate goal is to drive oil, and then recover oil from production wells. However, layered polymer injection is a commonly used method for increasing production and efficiency in polymer injection wells in oil fields It is a good method, and it is also a commonly used method. This method is characterized by precision and high efficiency. However, due to the complex process and difficult operation of layered polymer injection, it is greatly restricted in use.

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