Sliding sleeve for mining oil-gas well in layering manner

Abstract

The invention discloses a sliding sleeve for mining an oil-gas well in a layering manner; the sliding sleeve comprises a sliding sleeve body composed of an upper joint, a middle joint, a barrel body, a one-way valve joint and a lower joint which are connected orderly; the barrel body is provided with a circle of first through hole; a plurality of one-way valve components communicated with the inner cavity of the sliding sleeve body are arranged in the wall of the one-way valve joint along a circumferential direction; a sliding hollow shaft is arranged in the sliding sleeve body; the sliding hollow shaft is provided with an elastic location step formed by notching grooves; the wall of the sliding hollow shaft is provided with a circle of second through holes matched with the first through holes on the barrel body; and the barrel body is provided with a closing location groove and an opening location grove which are matched with the elastic location step on the sliding hollow shaft. According to the invention, a fluid channel is provided by a plurality of the one-way valve components; simultaneous production is realized for each producing layer by the energy of a stratum; in addition, the sliding sleeve prevents oil-gas fluid from flowing backwards low-pressure producing layers from high-pressure producing layers and completely utilizes the energy of deposit oil of each layer, so that production efficiency is maximized.

Description

technical field [0001] The oil and gas well exploitation equipment of the present invention particularly relates to a sliding sleeve used for layered exploitation of oil and gas wells. Background technique [0002] In the oil exploration industry, when performing well completion operations, a single well production string often needs to exploit multiple oil and gas layers. Due to the different pressure coefficients and reservoir characteristics of each oil and gas layer, layered production is required to maximize Maximize the use of formation energy to obtain maximum oil recovery. In modern oil and gas production, in order to control the exploitation of each layer in the downhole, each layer is usually isolated with a packer, and the opening and closing of the target layer is realized through the switch sliding sleeve. The use of switch sliding sleeves for layered mining is a common multi-layer well completion operation method in land and offshore oil fields. The switching ...

AI Technical Summary

Problems solved by technology

The two types of sliding sleeves can realize the switch function, but because the pressure coefficient, flow rate, flow pressure and other parameters of each reservoir are different, and are still changing with the development of production, it is difficult to avoid simultaneous production of multiple layers. When there is backflow in each reservoir, once backflow occurs, the formation energy will be wasted and the recovery rate will be reduced. Therefore, the method of mining each layer separately is usually used, which will lead to poor production efficiency.

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