Method and combination device for controlling profile and blocking water for thickened oil horizontal well of screen pipe well completion

Abstract

The invention relates to a combination device for controlling a profile and blocking water for a thickened oil horizontal well of screen pipe well completion. The combination device comprises a perforation device, a chemical plugging pipe column and a mechanical plugging pipe column which are arranged at a preset position in a horizontal well of the screen pipe well completion sequentially and alternatively. The chemical plugging pipe column is formed by a first plug, a first packer, an explosive relief valve and a second packer sequentially, an oil pipe with certain length is connected between the two packers, and the explosive relief valve is connected with the inside the oil pipe between the two packers. The mechanical plugging pipe column is formed by a second plug, a production screen pipe, a cutting uniflow valve, a third packer and a fourth packer sequentially, and an oil pipe with certain length is also connected between the third packer and the fourth packer. By means of a combination method of chemical plugging outside a horizontal slotted screen and mechanical plugging inside the horizontal slotted screen, validity of water blocking is prolonged, a water blocking effect of the screen pipe well completion is improved, oil producing capacity of an water-emerging thickened oil horizontal well is recovered, and a problem of water emerging of the thickened oil horizontal well of the existing screen pipe well completion is solved.

Description

technical field [0001] The invention relates to a method and device for profile control and water shutoff of oil-water wells in the field of oil production engineering, in particular to a method for profile control and water shutoff of heavy oil horizontal wells completed with screen tubes and a combined device thereof. Background technique [0002] The water shutoff technology of oil well is an important technology in oilfield development. Through water shutoff in oil well, it can effectively reduce the ineffective water production of oil well, increase the oil production of oil well, and finally improve the recovery rate of oil well. my country began to study this technology in the 1960s, and has formed relatively mature mechanical water shutoff and chemical water shutoff two types of water shutoff technology. Regardless of whether it is mechanical water plugging or chemical water plugging, the main targets of implementation are still vertical wells with common well comple...

AI Technical Summary

Problems solved by technology

In addition, heavy oil thermal recovery horizontal wells require high-temperature steam injection, and the corresponding water shutoff process must have high temperature resistance, which increases the difficulty of water shutoff in horizontal wells completed with heavy oil screens.

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