Well completion technique for efficiently controlling pressure and retaining water cone of horizontal well

Abstract

The invention discloses a well completion technique for efficiently controlling pressure and retaining water cone of a horizontal well, comprising a method for efficiently controlling the pressure andretaining the water cone of the horizontal well, a device and matching technology and a theory. The method comprises the following steps: A, placing non-coupling oil tube with the function of controlling pressure and retaining bottom water coning at the middle position in the horizontal well channel; and B, setting an excluder in the horizontal well to exclude the annular space between the non-coupling oil tube and a barefoot well or to exclude the annular space between the non-coupling oil tube and a sieve tube, so that crude oil after emerging from stratum flows from two ends to the middleand only can be output by the non-coupling oil tube. The technique for efficiently controlling the pressure and retaining the water cone of the horizontal well not only can retain bottom water coning,but also can significantly improve individual-well producing rate, has simple completion technology, cheap and easily obtained raw materials, no environmental pollution, convenient oil field implementation, and low cost.

Description

technical field [0001] The invention relates to a horizontal well completion method, a horizontal well realization device, and supporting technologies and theories. Background technique [0002] In the field of oil and gas development, for bottom water oilfields, the use of horizontal wells can delay the coning of bottom water. At present, horizontal wells have become the most effective means to improve single-well production and recovery in heavy oil reservoirs, fractured oil and gas reservoirs, low-permeability oil and gas reservoirs, and bottom-water oil and gas reservoirs. For horizontal wells, there are currently more than 20 well completion methods available, but the most common and most widely used completion methods in various oilfields are open hole completion, slotted liner completion, and external packer with tubing ( ECP) slot liner completion, perforation completion, sand control screen completion and gravel pack completion. [0003] However, various conventio...

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Problems solved by technology

[0003] However, various conventional horizontal well completion methods have very limited effects in delaying bottom water coning, resulting in the fact that horizontal wells in many oilfields at home and abroad cannot continue to produce after water production, and have to be shut down

[0004] Wherein the horizontal well completion of the slotted liner 101 with the external packer (ECP) is as follows: figure 1 As shown, its disadvantages are: the length of the blind leg is only the length of the ECP (generally less than 5 meters) of the external packer. After blocking a water-producing interval, the bottom water will soon go around to another interval, which is harmful to the delay. Bottom water coning doesn't have much effect

[0005] There is also a sliding sleeve liner 201 horizontal well completion with an external packer (ECP). figure 2 As shown, its disadvantages are: first, the length of the blind leg is only the length of the ECP (generally less than 5 meters) of the external packer. After blocking a water-producing interval, the bottom water will soon go around to another interval, Does not have much effect on delaying bottom water coning

Second, the bottom hole sliding sleeve is prone to failure and the life of the oil well is affected

Third, for the development of extended-reach horizontal wells, the switch of the bottom hole sliding sleeve is very troublesome

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