Lifting layered production string

Abstract

The invention relates to a lifting type layered oil production string, which includes a production string and a hand-off string connected to each other. The production string includes a hydraulic control pipeline, a hydraulic lifting device, and a production tubing connected together from top to bottom. , an oil pump, and a sealing plug; the lost-hand tubing string includes a hanging packer, a double-layer sand filter pipe, and a layered packer, the double-layer sand filtering pipe is arranged outside the sealing plug, and the hanging packer The upper end of the sealing plug is arranged below the oil well pump, and the layered packer is arranged at the middle of the sealing plug and is located between two oil layers. The invention provides a lifting type layered oil production string, which can change the process string of layered oil recovery in combined layers, and control the opening and closing of multi-layer switches in the downhole through the elongation and shortening of the string itself. Combined production of different intervals of oil production wells.

Description

technical field [0001] The invention relates to downhole equipment for oil exploitation, in particular to a lifting type layered oil production string. Background technique [0002] At present, most oilfields in China have entered the stage of water injection development, and most of the oil production methods adopt the general combined production mode, resulting in low injection-production correspondence ratio of oil and water wells, prominent interlayer conflicts, and non-main layer reserves have not been effectively developed, seriously affecting oil well productivity . The widely used method in on-site production is to use layered oil recovery technology to control the production of high aquifers, select the production of low aquifers in a targeted manner, and reduce the ineffective energy consumption caused by the production of high aquifers. [0003] The unconsolidated sandstone reservoir layered sand control and layered oil recovery integrated technology used in dome...

AI Technical Summary

Problems solved by technology

[0003] The unconsolidated sandstone reservoir layered sand control and layered oil recovery integrated technology used in domestic oilfields, the layered oil production and layer change technology after layered sand control is realized by adding hydraulic pressure to the casing, and the working status of the hydraulic layer change switch is difficult to monitor intuitively. For example, in China Patent ZL201020286610.X, date of announcement is June 8, 2011, titled Layered Sand Control Layered Oil Production Integrated Pipe String Discloses a layered sand control and layered oil production integrated pipe string, which consists of tubing, setting Composed of throwing hands, gravel packing tools, layered packers, switch-type sand control pipes, and plugs, it can control sand in layers in the whole well of unconsolidated sandstone reservoir oil wells in one trip, and control the switching action of hydraulic control layers to control the production of oil wells. Single production, separate production, and combined production can also be carried out, but the working status of the hydraulic layer-changing switch is difficult to monitor intuitively. The general combined production of oil layers leads to prominent contradictions between layers, serious inter-layer interference, low injection-production correspondence ratio, and the production of reserves in non-main layers The contradiction of low oil production rate directly affects the improvement of oil production speed and oilfield development benefits, which is a technical problem to be solved in multi-layer oil well production

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