A heavy oil double-injection thin recovery device

Abstract

The invention relates to a heavy oil double-injection thin recovery device. The technical solution is: the bottom of the oil pump barrel is connected to the gas-liquid mixing injector 5, and the bottom of the gas-liquid mixing injector is provided with a pump tailpipe, and the outer wall of the oil pump barrel and the gas-liquid mixing injector is provided with a double-head Liquid injector, a high-temperature packer is provided between the outer wall of the lower tail pipe of the pump and the oil well casing; the liquid injector body of the double-headed liquid injector is an annular sleeve structure, and the upper and lower parts of the liquid injector body are respectively installed There is a liquid injection channel, the inner cavity of the liquid injection channel is provided with a sealing steel ball and a supporting spring, a liquid outlet channel is provided between the liquid injection channel of the upper liquid injector and the liquid injection channel of the lower liquid injector, and the other end of the liquid outlet channel Connected with the gas-liquid mixer. The beneficial effect is: due to the special device of gas-liquid double injection, the heavy oil has undergone a qualitative change in the reservoir, that is, the physical fluidity of the heavy oil has become stronger, and the operation effect has been greatly improved, so that the operation cycle is 2‑3 more than double the extension.

Description

technical field [0001] The invention relates to a heavy oil recovery device and method, in particular to a heavy oil double-injection thin recovery device. Background technique [0002] In the process of petroleum exploitation, the molecular force of heavy oil due to the molecular weight is relatively large, the freezing point is high, and the viscosity is high, so it is not easy to exploit. At present, the methods of heavy oil exploitation include hot water cycle viscosity reduction, electric heating viscosity reduction, and burning oil layers. , hot water flooding, steam huff and puff and steam flooding, chemical methods, etc. At present, the methods used are mainly gas injection, injecting high-temperature CO2, and extracting some of the thinner heavy oil in the way of braising the well, but During the mining process, wax deposition will occur due to temperature changes, which brings great difficulties to mining. [0003] Chinese Patent Publication No. CN1915488, the pat...

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Problems solved by technology

[0002] In the process of petroleum exploitation, the molecular force of heavy oil due to the molecular weight is relatively large, the freezing point is high, and the viscosity is high, so it is not easy to be exploited. At present, the methods of heavy oil exploitation include hot water cycle viscosity reduction, electric heating viscosity reduction, and burning oil layers. , hot water flooding, steam huff and puff and steam flooding, chemical methods, etc. At present, the methods used are mainly gas injection, high-temperature CO2 injection, and the production of some heavy oils that are relatively thin in heavy oils by means of stewing wells. During the mining process, wax deposition will occur due to temperature changes, which brings great difficulties to mining.

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