Segmented oil-stabilizing water-controlling method and device

Abstract

The invention relates to a segmented oil-stabilizing water-controlling method and device, and the segmented oil-stabilizing water-controlling method and device are used for plugging a plurality of layers of a horizontal well and self-adaptive water controlling and oil-stabilizing production. The segmented oil-stabilizing water-controlling method comprises determining the plugging position, and calculating the injection position and the injection amount of a chemical plugging agent in the horizontal well in dependence on the oil reservoir characteristic parameters; calculating the number and the predetermined positions of water-controlling devices on a center tubular column of the horizontal well in dependence on the oil reservoir characteristic parameters; injecting the chemical plugging agent into an annular space between the well wall and a sand-prevention outer tubular column of the horizontal well to form a chemical packer in dependence on the calculating result; achieving outer annular space plugging between the sand-prevention outer tubular column and the well wall; installing water-controlling devices in a center pipe of the horizontal well, and installing a self-expansion packer on the position, between the center pipe and the sand-prevention outer tubular column, corresponding to the chemical packer, thereby achieving inner annular space plugging between the sand-prevention outer tubular column and the center pipe, and water controlling and flow limiting. The invention also provides a device used for the above segmented oil-stabilizing water-controlling method.

Description

technical field [0001] The invention relates to a blockage technology for staged production in oil production, in particular to a device and method for staged oil stabilization and water control. Background technique [0002] Horizontal wells have the advantages of high production, low production pressure difference, and long water-free oil recovery period. In order to ensure long-term water-free production during the entire production cycle of horizontal wells, inhibit the rise of water content, and improve production efficiency, the water control technology for production wells Emerging in endlessly, the main technical background and prior art are summarized as the following aspects: [0003] (1) The completion of horizontal wells in the early stage of oilfield exploitation adopts the completion method of screen pipe or slotted liner pipe, and there is no isolation in the annular space outside the pipe, so it is difficult to implement various mechanical water control and o...

AI Technical Summary

Problems solved by technology

[0003] (1) The completion of horizontal wells in the early stage of oilfield exploitation adopts the completion method of screen pipe or slotted liner pipe, and there is no isolation in the annular space outside the pipe, so it is difficult to implement various mechanical water control and oil stabilization measures after the water cut rises;

[0004] (2) Water control by means of chemical water plugging: In order to control water in early production wells, it is necessary to stabilize oil production and control water production on the basis of the existing pipe string structure. The existing technology mostly uses the general injection method of chemical plugging agents Water control, this method is difficult to accurately control the injection position of the plugging agent, and it is easy to cause oil layer pollution, which eventually leads to many adverse consequences;

[0005] In the prior art, the use of chemical plugging agents for water plugging has many defects such as inaccurate control of the injection position and easy contamination of the formation, and it is a passive water control method that cannot be adaptively adjusted according to production conditions

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