Construction method for lifting up and placing down SAGD well temperature measurement cable under pressure

Abstract

The invention discloses a construction method for lifting up and placing down an SAGD well temperature measurement cable under pressure. The construction method comprises the following steps that the temperature measurement cable is placed down in a well under pressure; the sector end of an I-shaped flange is matched with the well mouth and then mounted and fastened; a sealing device for lifting up and placing down the temperature measurement cable under pressure is completely mounted and fastened; packing is placed in a packing box and pressed through a packing box gland, whether the temperature measurement cable is sealed by the packing or not is observed, then a thermal-production gate valve is opened, the temperature measurement cable is guided into the sealing device for lifting up and placing down the temperature measurement cable under pressure from the top of the sealing device through an injection device till the temperature measurement cable reaches the designed temperature measurement depth; after the temperature measurement cable is placed downwards to the designed position, grease is injected into a grease injection valve of a grease injection sealer of the sealing device for lifting up and placing down the temperature measurement cable under pressure through a grease injection machine, so that the temperature measurement cable is sealed; and the packing is removed after pressure is released through a pressure relief valve, the packing box gland, the packing box, a pressure relief flange and the hydraulic sealer are dismounted sequentially from the upper end of the sealing device for lifting up and placing down the temperature measurement cable under pressure through a hoisting clamp, and finally, a well mouth static sealing device is mounted for sealing the well mouth and the temperature measurement cable. By adoption of the construction method, pollution can be effectively reduced, and the environment is protected.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for a SAGD well temperature measuring cable to be lifted and lowered under pressure. 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 undergro...

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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