Sealing device for lifting and lowering SAGD well temperature-measuring cable under pressure

Abstract

The invention discloses a sealing device for lifting and lowering an SAGD well temperature-measuring cable under pressure. The sealing device for lifting and lowering the SAGD well temperature-measuring cable under the pressure includes a pressure relief valve, a thermal recovery gate valve, a hydraulic blowout preventer and a grease injection valve. The flange part at the other end of an I-shaped flange is fixedly connected with the flange part at one end of the thermal recovery gate valve, wherein the flange part at one end of the I-shaped flange is matched with a wellhead. The flange part at the other end of the thermal recovery gate valve is fixedly connected with the flange part at one end of a grease injection sealer. The flange part at the other end of the grease injection sealer is fixedly connected with the flange part at one end of the hydraulic blowout preventer. The flange part at the other end of the hydraulic blowout preventer is fixedly connected with pressure relief flanges and the flange part at one end of a packing box, wherein the pressure relief flanges are connected in series. The other end of the packing box is in threaded connection with a packing gland. Sealing steel rings are arranged between the I-shaped flange and the thermal recovery gate valve, the thermal recovery gate valve and the grease injection sealer, the grease injection sealer and the hydraulic blowout preventer, the hydraulic blowout preventer and the pressure relief flanges, and the pressure relief flanges and the packing box. The sealing device for lifting and lowering the SAGD well temperature-measuring cable under the pressure realizes dynamic sealing without the need of well stopping, pressure relief and cooling, shortens the construction period, reduces the ground construction equipment and cost, effectively reduces pollution and protects the environment.

Description

technical field [0001] The invention relates to a sealing device, in particular to a sealing device used for pressure lifting and lowering of a temperature measuring cable in a SAGD well. Background technique [0002] At present, when lifting and lowering the temperature measuring device in a SAGD well, it is necessary to stop the pumping and injection of the production well first, wait for the temperature and pressure of the production well to drop, and then use the pump truck and water truck to carry out the well killing operation. Open the wellhead test pipeline to carry out the lifting and lowering construction of the temperature measuring cable. SAGD downhole temperature test routine lifting and running operations will use high-density well killing hydraulic wells or blowout means to reduce the downhole pressure of the oil well before operating the oil well. High-density well killing hydraulic wells are not only costly and time-consuming, but also block underground oil...

AI Technical Summary

Problems solved by technology

[0003] 1. Affect the normal production cycle of production oil wells and reduce production

[0004] 2. Once the killing fluid volume is too large during the well killing process, it will affect the fluctuation of the oil production liquid level. In severe cases, the oil production well cannot be produced and needs to be re-operated

[0005] 3. Waste of resources, at least two to three trucks of water or concentrated brine are needed to kill each well; concentrated brine at high temperature corrodes metals

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