Pressure-bearing sealing device for pumping well

Abstract

The invention discloses a pressure-bearing sealing device for a pumping well. The pressure-bearing sealing device comprises a three-way connector, a second emptying valve, a second double-male pup joint, a sleeve pup joint and a sealing assembly. A first connector of the three-way connector is in sealed connection with one end of the casing pipe pup joint through threads. The other end of the casing pup joint is hermetically connected with a casing at the wellhead of the producing well through threads; a second interface of the three-way joint is hermetically connected with one end of a second double-male short joint through threads; the other end of the second double-male pup joint is hermetically connected with the second emptying valve through threads; the sealing assembly comprises a sealing flange, an oil pipe hanger, a first emptying valve, a first pressure gauge and a first stop valve, and a second stop valve is further arranged on the three-way connector; and the second stop valve is connected with a second pressure gauge. According to the pressure-bearing sealing device, the connecting reliability of all the connecting positions is high, meanwhile, the pressure change of the oil pipe can be checked through the first pressure gauge when water is injected into the oil producing well, and safety and sealing performance are improved.

Description

technical field [0001] The invention belongs to the technical field of simple wellhead equipment for oil production wells, and in particular relates to a pressure-bearing sealing device for an oil pumping well. Background technique [0002] At present, almost all production wells in shallow oil layers use simple wellheads with simple structures. At the oil production site, a plurality of simple oil wells (called satellite wells) are usually set up within a certain range for oil production operations. Oilfield water injection is one of the important means to replenish energy to the formation and improve oil recovery in the process of oilfield development. In the process of oil field development, water is injected into the oil reservoir through special water injection wells to maintain or restore the pressure of the oil layer stored in the oil reservoir. [0003] In the well site of satellite wells, the water injection well is usually set near the center of the range surroun...

AI Technical Summary

Problems solved by technology

In the prior art, the sealing device used for the sealing of the wellhead of the oil-pumping satellite well adopts a welded assembly structure. Although the structure is simple and the cost is low, the sealing performance and safety reliability are poor, and the sealing device cannot be sealed. Observation of the pressure in the wellhead

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