Self-adaptive inflow control device, intelligent well completion pipe string and well completion method

Abstract

The invention provides a self-adaptive inflow control device, an intelligent well completion pipe string and a well completion method, and belongs to the field of oil field well completion. The self-adaptive inflow control device comprises a main body, an inlet flow channel arranged on the main body, and a main flow channel and a branch flow channel which are respectively communicated with the inlet flow channel; a circular groove is formed in the main body; an annular baffle coaxial with the circular groove is mounted in the circular groove; an outlet hole is formed in the center of the circular groove; the outer wall of the annular baffle and the wall of the circular groove define a rotational flow channel; a rotational flow chamber is defined by the inner wall of the annular baffle; the other end of the main flow channel and the other end of the branch flow channel are respectively communicated with the rotational flow channel; a flowing groove is formed in the annular baffle; and the rotational flow chamber is communicated with the rotational flow channel through the flowing groove. The self-adaptive inflow control device can effectively realize sand prevention, water control and stable production of the reservoir, and has the characteristics of reasonable pipe string structure, effective design method and reliable layer section packing performance.

Description

technical field [0001] The invention belongs to the field of oil field completion, and in particular relates to an adaptive inflow control device, an intelligent well completion string and a well completion method, in particular to an intelligent completion string structure, a well completion design method and a well completion method for multi-layer fracturing filling. The operation process is suitable for the completion of horizontal wells in oil fields, especially for the inflow control completion of horizontal wells with high water cut and sand production. Background technique [0002] Horizontal wells have the advantages of large drainage area, high sweep coefficient and small wellbore pressure drop, and have been widely used in the development of watery reservoirs, with remarkable application effects. However, the "heel-toe effect" will occur due to the influence of wellbore friction and pressure drop in the production of horizontal wells. A large amount of water is p...

AI Technical Summary

Problems solved by technology

However, the current fracturing and filling methods cannot separate multiple reservoir intervals with different physical properties for fracturing and filling.

At the same time, there are no research reports on completion strings and well completion methods that combine fracturing and packing sand control with adaptive water control smart completion. well method

[0006] Chinese Patent Publication CN106246143B discloses a water control method and a water control and sand control pipe column for a water-out oil layer, which utilizes the water-swellable rubber's water-swellable property , Plugging the annular space between the sand control pipe string and the wellbore with perforated blast holes, the disclosed water control and sand control pipe string includes a screen tube, the screen tube is provided with a liquid inlet channel, and the sleeve is made of water-swellable rubber One end of the sleeve is vulcanized together with the vulcanized sleeve, and the vulcanized sleeve is fixed on the outside of the screen so that the sleeve is located above or below the liquid inlet channel. To block the water layer, the water layer must be accurately positioned in advance, and it does not have the function of self-adaptive water control; the sand control effect is not good and easy to fail when the screen is used for sand control, and it does not have multi-layer and segmental sand control, production increase and intelligent water control function; Chinese patent publication CN108533236A discloses a string capable of implementing lightweight particle packing and sand control and water control production, which includes a packing packer, a packing conversion device, an adaptive flow regulating water control screen and a plug

When the filling tool is inserted into the filling conversion device and opened, the filling liquid carrying light particles in the filling tool will be guided into the annulus between the adaptive flow control screen and the casing , in which the light particles will fill the aforementioned annulus, and the filling fluid will seep into the self-adaptive flow-regulating water control screen, and under the guidance of the filling conversion device, it will pass through the backflow gap between the filling tool and the packing packer. It enters the annulus between the filling tool and the casing, but the water and sand control string proposed by it uses gravel packing for sand control. The effect of sand control and stimulation is not as good as that of fracturing packing, and it does not have the function of multi-layer segmentation and multi-layer Functions of segmented sand control and production stimulation; U.S. patent publication US2002 / 0148610A1 discloses an intelligent well and its control, which relates to a combination of sand control strings, which can realize the individual inflow control of each layer in a horizontal well exploited in multiple layers. And it has the ability of remote control, and the layers are sealed with packers

Gravel packing is used for sand control, and the inflow control device (called an intelligent production regulating valve) is used to control water, but the water control and sand control string proposed by it uses gravel packing for sand control, and the effect of sand control and stimulation is not as good as that of fracturing packing; the application of inflow control device Water control, but the inflow control device does not have the function of automatic fluid identification, cannot adaptive water control, and it does not have the functions of multi-layer and segmental sand control, production increase, and self-adaptive water control.

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