A heavy oil recovery method integrating thermal injection recovery and mechanical recovery

Abstract

The present invention is a heavy oil recovery method integrating heat injection recovery and mechanical oil recovery. The specific steps are: S1, preparatory work; S2, running a combined heat injection string in the wellbore; S3, after running the heat injection string, Install the christmas tree, and after the christmas tree is installed, implement the heat injection process; S4, self-spray production, measure the temperature of the output fluid, and provide a basis for the subsequent selection of the temperature resistance level of the mechanical mining tool; S5, lower the mechanical mining tool; S6, Machine mining. In the present invention, the large-diameter wellbore and the heat injection string are lowered first, and then heat injection is performed; after the heat injection and self-spraying production are completed, no dynamic heat injection string is required, and the oil tree is not required to be dismantled, only the coiled tubing is needed to connect The mechanical mining tools are sent to the predetermined position in the heat injection pipe string for sealing, and then the mechanical mining can be realized, which solves the contradiction between the resistance of the mechanical mining tools and the high temperature of the thermal injection oil production under the existing technical conditions. Oil development provides an important technical means.

Description

technical field [0001] The invention relates to the field of heavy oil recovery, in particular to a heavy oil recovery method integrating thermal oil recovery and mechanical oil recovery. Background technique [0002] Due to the high viscosity of heavy oil, it is not suitable or will not flow naturally in the original state of the formation. At present, the most commonly used method for the exploitation of heavy oil fields is the thermal oil recovery process, that is to use the heat-sensitive effect of heavy oil to heat the underground heavy oil, so that the original heavy oil viscosity is greatly reduced, and then the economic development of heavy oil is realized. After the heavy oil is heated, its fluidity becomes better, and the energy of the corresponding fluid is increased by artificially injected hot steam or multi-element thermal fluid. The heavy oil can be produced by self-spraying at the initial stage, and the fluid energy gradually decreases with the self-spraying ...

AI Technical Summary

Problems solved by technology

[0005] 2. During operation, in order to meet the requirements of well control and environmental protection, the leakage of washing and killing fluids is inevitable. The lost washing and killing fluids have a cooling effect on the formation or heavy oil that has been heated and heated in the early stage, which will cause the oil to be removed after the operation. When harvesting by machine, the production effect is not ideal

[0006] In response to these shortcomings, people have been trying to realize the integration of the heat injection string and the mechanical mining string. The high temperature resistance cannot meet the requirements, so it has to be realized in two strings, which limits the process of heavy oil production and affects the production efficiency

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