Three-layer insertion pipe mechanical water exploration and plugging method and water exploration and plugging pipe column

Abstract

The invention discloses a three-layer insertion pipe mechanical water exploration and plugging method and a water exploration and plugging pipe column. A well completion pipe column in the water exploration and plugging pipe column comprises an oil pumping pump, a first sealing insertion pipe, a second sealing insertion pipe, a screening pipe, a third sealing insertion pipe and a fourth sealing insertion pipe which are arranged from top to bottom and are communicated with one another through connection pipes, wherein when the well completion pipe column is lifted or dropped, sealing insertion pipes of the four sealing insertion pipes, which move to positions where two packers are positioned, are matched with central pipes of the corresponding packers in a sealed manner, so that two oil layers on the upper sides and the lower sides of the packers are packed and partitioned; when the well completion pipe column is lifted or dropped to adjust the position of the screening pipe and the communicating states of the oil layers by changing position relations between the four sealing insertion pipes and the two packers; and an oil pump works to exploit the oil layer on which the screening pipe is positioned and the oil layer communicated with the oil layer on which the screening pipe is positioned. By the water exploration and plugging method and the pipe column with a simple structure, three-stage sealing for the oil layers can be realized, and a scheduled layer of a target layer can be exploited.

Description

technical field [0001] The invention belongs to the technical field of mechanical water finding and blocking in oil field mechanical exploitation, and in particular relates to a three-layer intubation mechanical water finding and blocking method and a water blocking pipe column. Background technique [0002] Most oilfields are heterogeneous oilfields, which need to be exploited in separate layers in the later stage of development. Water plugging technology is an important process technology for stratified production of heterogeneous reservoirs in oilfield development, and it is also an important measure for effectively understanding formations, implementing stratified production, and realizing "stabilizing oil and controlling water" in the middle and late stages of oilfield development. At present, domestically commonly used water-seeking and plugging layered mining strings are as follows: [0003] A) Pump-seal integrated tubing string: Since the oil well pump and the packe...

AI Technical Summary

Problems solved by technology

[0003] A) Pump-seal integrated tubing string: Since the oil well pump and the packer are directly connected together, the tubing string has no anchoring mechanism. During the pumping process of the oil well pump, the tubing string has peristalsis, which directly affects the plugging life of the packer , also affects the pump efficiency; the inspection pump needs to be replaced; the tubing string is in a bent state, and there is eccentric wear of the rod and tube, which affects the life of the rod and tube; relatively frequent operations; low temperature and pressure resistance; layer change mining cannot be performed;

[0004] B) Bridge plug water plugging: suitable for plugging bottom water, although it can be checked, but it takes a lot of trips to check the sealing string, which is limited to two layers; the operation cost is high;

[0005] C) Lost water plugging: for wells with clear understanding and eccentric wear wells, although the pipe string can be simplified, but the sealing cannot be checked, and it is limited to two-layer mining, and it is difficult to unseal the well with large well deviation or sand production, and the tools are difficult take out

[0006] D) Intelligent multi-level water blocking: as disclosed in the Chinese Invention Patent Publication Specification CN101042045A, an intelligent mechanical method for finding water blocking and the pipe string adopted are passed through a rated high pressure and a rated low pressure. , to turn on and off the lower universal switches one by one, although it can block water or find water, it can realize layer-changing mining, limited by the current technology or wellbore, the success rate of implementation is very low, and the operation is complicated and the operation cost is high

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