Hydraulic starting and closing device for layered oil production of sidetracked well

Abstract

The invention relates to a hydraulic starting and closing device for layered oil production of a sidetracked well. According to the technical scheme, a liquid inlet ring is connected to the upper sideof a lower connector, a one-way valve is arranged in a containing cavity of the lower side of the liquid inlet ring, and the liquid inlet ring is connected with a reversing track; a starting and closing execution valve bush is connected to the outer wall of the liquid inlet ring, a rotation ring sleeves the outer side of the reversing track, and a track pin is placed in a track groove of the reversing track through a track nail hole of the rotation ring; a sealing reversing sleeve is connected to the upper end of the starting and closing execution valve bush, an upper connector is connected to a pressure adjustment check ring, then a return spring sleeves a sealing short segment, one end of the return spring is in contact with a pressure check ring, the other end of the return ring is incontact with the pressure adjustment check ring, and the pressure adjustment check ring drives the sealing reversing sleeve to conduct sliding cooperation along the outer wall of the sealing short segment; a liquid outlet is formed in the lower end of the sealing short segment. The hydraulic starting and closing device has the advantages that an original three-layer structure is converted into a two-layer structure through a structural conversion part, the inner diameter of a layered oil production tool is further increased, layered oil production on multiple oil layers is achieved, and the applicative range is wider.

Description

technical field [0001] The invention relates to a hydraulic switch device and a method for layered oil recovery for sidetracking wells, in particular to a hydraulic switch device for layered oil recovery for sidetracking wells. Background technique [0002] In the process of oil exploitation, due to the development of petroleum technology, new oil layers were discovered around some old oil wells, in order to protect the geological structure, and also to save resources and funds. At present, people often open windows on the basis of old oil wells (that is, sidetracking) to achieve the purpose of exploiting new oil layers. However, this sidetracking well is limited by various conditions, such as: the diameter of the original well, geological conditions, etc. The influence of the hardness of the rock formation, the precision of the orienter, etc., such as the size of the drilled well hole, is generally not large. At present, the diameter of oil well casing is generally between...

AI Technical Summary

Problems solved by technology

The existing problem is: the inner diameter of the three-layer structure adopted is relatively small, which is difficult to meet the needs of the small wellbore of the above-mentioned old oil wells. The sidetracking wells can only be used on sidetracking wells above 7 inches, and the internal diameter of the hydraulic switch of φ79 is only φ32. The subsequent proration process of the hydraulic switch of this internal diameter has been unable to be implemented.

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