Long-effect packer for oilfield water exclusion production

Abstract

The invention provides a long-effect packer for oilfield water exclusion production. The long-effect packer for oilfield water exclusion production comprises an upper joint, an inserting pipe, a catching sleeve, a packer rubber, a distance ring, a central pipe, a retaining-pressing sleeve, an upper cone, a locking pin, a slip, a spring, a slip sleeve, a cone, a middle joint, a start shear pin, a setting steel ball, a setting ball seat, a releasing shear pin, a packing cup, a connector, a slide sleeve outer cylinder, a locking steel ball, a slide sleeve, a central sleeve, a reset spring, a lower joint and a plug. The packer, the inserting pipe and a backward flow preventing device are integrally designed, and setting, releasing and production are completed when a string is down once, so that construction technologies are simplified greatly. The long-effect packer for oilfield water exclusion production has the advantages that the packer is specially designed for water exclusion production of oilfield casing collapse wells, normal oil production is unaffected during packing, the matched backward flow preventing device is designed integrally to achieve a backward flow preventing function during pump inspection, and a special tool is used for catching when wellbore operation is needed.

Description

technical field [0001] The invention belongs to the technical field of oil recovery process devices in oilfields, and in particular relates to a process device for isolation of oil wells in which oil layers and water layers are connected due to casing damage and corrosion perforation. The utility model relates to an anti-influx isolation well completion device suitable for well completion with casing and leakage of water from the upper part of the reservoir, and is specifically a long-term production isolation packer for oilfields. Background technique [0002] With the continuation of oilfield development time, downhole casings have successively broken due to corrosion and other reasons, resulting in the formation and oil layer connection, affecting the normal development of the oilfield and even polluting the formation water source and damaging the environment. So far, CNPC has accumulated more than 20,000 sets of broken wells . The commonly used techniques for casing bro...

AI Technical Summary

Problems solved by technology

At present, there are two main types of packers used for production isolation. One is the traditional Y111, Y211, Y341 and other conventional production isolation packers. This type of packer is mostly directly connected to the lower end of the oil production string (with threaded rigid connection) ), the bending of the production tubing string in the well or the wriggling of the tubing string during the production process will easily lead to the failure of the packer. At the same time, once any downhole accessories such as the oil well pump have problems, the packer must be unpacked and the tubing string must be pulled out. Therefore, the overall The validity period is short. In the field application, it is also found that this type of packer’s repeated production isolation often leads to extrusion deformation of the packer setting section, serious corrosion damage, and deterioration of working conditions, resulting in successive shortening of the isolation period or even failure.

The second is Y141, Y453, Y445 and other long-life isolation packers. This type of packer needs to be lowered with special setting tools for setting, and then lowered into the oil production string with intubation for docking and then normal production. When it needs to be pulled out, special tools are used for drilling and grinding, the construction process is complicated and the cost is high

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