Oil production structure capable of achieving multi-oil-layer commingled production

Abstract

The invention relates to an oil production structure capable of achieving multi-oil-layer commingled production. The oil production structure comprises a polished rod, a plunger type annular partition plate, a casing head and the like. The polished rod is connected with a reversed-T-shaped annulus pipe through an overflow centralizer. An upper liquid outlet, a lower liquid outlet and an oil-gas partition plate are all connected with the casing head. The plunger type annular partition plate is connected with the oil-gas partition plate and the centralizer. The reversed-T-shaped annulus pipe is connected with a hollow sucker rod through a hollow centralizer. The hollow sucker rod is connected with a pump cylinder. The pump cylinder is connected with a fixing valve. The casing head is connected with a sleeve through a threaded seal ring. The sleeve is connected with a shaft bottom. The casing head is connected with an oil pipe. The oil pipe is connected with a screen pipe through the fixing valve. An upper side valve, an upper packer, a lower side valve and a lower packer are each connected with the oil pipe and the sleeve. The upper side valve comprises a seal ring and a valve ball. The oil production structure has the beneficial effects that the oil production structure can be used for three-layer commingled production with different pressures, the oil field oil production efficiency is improved, the production process is simplified, the production cost of oil fields is reduced, and the economic benefits of single-support multi-layer oil well production are improved.

Description

[0001] Technical field [0002] The invention relates to an oil production string structure for multi-oil layer combined production, in particular to an oil production structure system for combined production of three oil layers with different pressures in the same wellbore at the same time. [0003] technical background [0004] In the process of oil reservoir exploration, some superimposed oil layers are often involved. Because the pressure of each oil layer is different, if the single-layer well production technology is used, it will often cause problems of co-production compatibility between oil layers, such as the problem of oil production strings, etc. The technology of layered oil recovery is cumbersome, time-consuming and labor-intensive, and layer-by-layer mining is not significant for the economic benefits of single-layer multi-layer oil wells. In order to solve the above problems, generally, single-layer multi-layer oil wells will use co-production technology. Known co-pro...

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Problems solved by technology

[0004] In the process of reservoir exploration, some superimposed oil layers are often involved. Due to the different pressures of each oil layer, if the single-layer well production technology is used, it will often cause problems of compatibility between oil layers, such as the problem of oil production flow, and gradually The process of layer-by-layer oil recovery is cumbersome, time-consuming and labor-intensive, and layer-by-layer recovery is not significant for the economic benefits of single multi-layer oil wells. In order to solve the above problems, the common production technology is generally used for single The known co-production technology is often only used for the partial pressure co-production of two oil layers or the co-production of multiple oil layers at the same pressure, but some superimposed oil layers have three or more different pressure oil layers, making it impossible to achieve co-production with the existing production technology

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