Screw pump wellhead steam injection sealing device and injection-production integrated polish rod sealing device

Abstract

The invention discloses a screw pump wellhead steam injection sealing device and an injection-production integrated polish rod sealing device. As for the screw pump wellhead steam injection sealing device, the outer wall of a base of a sealer is connected with an upper end opening of an oil pipe four-way joint of a wellhead in a sealed mode, the inner wall of the base of the sealer is connected with a steam injection sealing barrel, and the lower end of a steam injection sealing core is connected with an oil pumping rod; a sealing barrel lower end conical surface sealing structure is arrangedon the inner wall of a lower end opening of the steam injection sealing barrel, a sealing core outer wall conical surface sealing structure is arranged on the outer wall of the steam injection sealingcore, and the sealing barrel lower end conical surface sealing structure and the sealing core outer wall conical surface sealing structure are matched mutually for sealing; and a base upper end conical surface sealing structure is arranged on the inner wall of an upper end opening of the base of the sealer, a metal conical surface sealing ring is arranged on the outer wall of a hanging pup joint,and the base upper end conical surface sealing structure and the metal conical surface sealing ring are matched for sealing. According to the screw pump wellhead steam injection sealing device, the processes of steam injection, pumping conversion, production and the like in a screw pump injection-production integrated technology are subjected to optimization design, so that safety is improved, and the screw pump well injection-production integrated technology is perfected.

Description

technical field [0001] The invention relates to oil exploitation technology, in particular to a screw pump wellhead steam injection sealing device and an injection-production integrated polished rod sealing device. Background technique [0002] The stator and rotor of the all-metal screw pump are all made of metal, which can implement the integrated injection and production process in heavy oil thermal recovery wells. After steam injection, the pipe string will not be moved for pumping, which simplifies the operation process. According to research, the existing all-metal screw pump injection-production integration technology still uses the screw pump polished rod sealer that only replaces the high-temperature resistant sealing disc as the wellhead sealing device during steam injection. The first method is that once the packing seal fails during the steam injection process, the well cannot be sealed in time, and the leakage of high-temperature and high-pressure steam cannot b...

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Problems solved by technology

The first method is that once the packing seal fails during the steam injection process, the well cannot be sealed in time, and the leakage of high-temperature and high-pressure steam cannot be controlled; the second is to use this sealer to implement the integrated injection-production process, and the entire polished rod stands on the wellhead during steam injection There are also certain security risks

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