Intelligent water controlling pup joint

Abstract

The invention provides an intelligent water controlling pup joint comprising a base tube and autonomous inflow control devices. A plurality of centralizing edges are arranged on the surface of the base tube in the length direction. A groove is formed between every two adjacent centralizing edges. An installation hole penetrating through the inner wall of the base tube is formed in each groove. The autonomous inflow control devices are arranged in the installation holes of the base tube. The outer end face of each autonomous inflow control device is lower than the outer end face of each centralizing edge. The intelligent water controlling pup joint does not need to be used in cooperation with a centralizer. The outer end face of each autonomous inflow control device is lower than the outer end face of each centralizing edge, so that the situation that because the autonomous inflow control devices are in direct contact with the wall of a sleeve and generate friction, the autonomous inflow control devices are damaged is avoided, the autonomous inflow control devices are effectively protected, and the service life of each autonomous inflow control device is prolonged; besides, the grooves between the centralizing edges guarantee flow channel intervals allowing liquid to flow into the autonomous inflow control devices; and meanwhile, because it is not needed to install the centralizer on the outer portion of the base tube, the base tube with the wall thickness greatly larger than the thickness of each autonomous inflow control device can be selected, and a full-aperture inner portion of the intelligent water controlling pup joint is achieved.

Description

technical field [0001] The invention relates to an oil well completion pipe string, in particular to an intelligent water control nipple. Background technique [0002] With the development of oil exploration and development technology, the use of horizontal well technology to develop oil and gas fields has become an effective technical means to improve oil recovery and single well production, exploit remaining oil, and reduce the cost per ton of oil. Horizontal wells increase the contact area between the wellbore and the reservoir, and can better develop thin oil layers or reservoirs with high vertical permeability, and play an increasingly important role in the exploitation of oil and gas resources. At present, most domestic horizontal wells have entered the medium-high water cut period, and the production of horizontal wells has dropped rapidly after water breakthrough. In some oilfields, most of the horizontal wells see water soon after they are produced or even just put...

AI Technical Summary

Problems solved by technology

[0007] Based on this, it is necessary to provide a solution to the problems that the wall thickness of the oil pipe is limited, the installation is complicated, and the flow path of the liquid flowing into the self-adjusting flow control valve cannot be effectively guaranteed when installing the self-adjusting flow control valve on the oil pipe nipple. An intelligent water control nipple with self-righting function to ensure that the liquid flows into the effective flow path of the self-adjusting flow control valve, the inner diameter of the nipple is not limited, and it is easy to install

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