Layered oil extraction device for sidetracking well

Abstract

The invention relates to a layered oil extraction device for a sidetracking well. According to the technical scheme, the device comprises a crude oil well casing, artificial bottom of a crude oil well, a sidetracking well cementing casing, artificial bottom of a sidetracking well and a separate extraction pipe column, wherein the sidetracking well cementing casing is arranged on one side of the crude oil well casing, the separate extraction pipe column is arranged in the crude oil well casing and the sidetracking well cementing casing, a Y445 packer, a safety joint, a packer, a plurality of hydraulic switches and a plug are sequentially arranged on the separate extraction pipe column from top to bottom. The method has the beneficial effects that a first oil layer can be extracted by applying liquid pressure on a surface wellhead, one hydraulic switch can be in an open state and other hydraulic switches can be in a closed state under a certain set pressure; meanwhile, under a certain set pressure, the second hydraulic switch is in an open state, and the other hydraulic switch is in a closed state, so that the extraction of a second oil layer can be realized, and the layered oil extraction control can be realized.

Description

technical field [0001] The invention relates to a petroleum industry oil production equipment and method, in particular to a layered oil production device 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 7 inches and 5½ inches, that is, between 178 (25...

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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