Mechanical thermal insulation type horizontal well steam injection string

Abstract

The invention discloses a mechanical thermal insulation type horizontal well steam injection string. The mechanical thermal insulation type horizontal well steam injection string comprises a steam injection string body and is characterized in that the steam injection string body is connected with a thermal insulation steam injection device in series, and the thermal insulation steam injection device is composed of a thermal packer and a radial positioning mechanism arranged on a blocking ball barrier on a central pipe of the thermal packer. After the mechanical thermal insulation type horizontal well steam injection string is realized, as the thermal insulation steam injection device is arranged, the mechanical thermal insulation type horizontal well steam injection string can carry out mechanical thermal insulation treatment on each sleeve pipe of a horizontal well according to use needs. Therefore, compared with the prior art, the thermal insulation cost of sleeve pipes of the horizontal well can be effectively lowered, the thermal insulation quality is improved, and thermal insulation operation is simplified.

Description

technical field [0001] The invention relates to steam huff and puff equipment for thermal recovery oil wells, in particular to a mechanical heat-insulated steam injection pipe string for horizontal wells. Background technique [0002] At present, in the field of oil exploitation, the main method people use to thin heavy oil is the "steam stimulation method". The pipe string is composed of heat insulation pipe, telescopic pipe, oil pipe and so on. When installing steam stimulation equipment, the steam injection pipe string is sent to the predetermined position downhole through the inner hole of the oil well casing, and its upper end is fixedly connected with the exhaust port of the ground steam boiler. The implementation of the steam stimulation method first needs to solve the problem of "heat insulation" of the oil well casing, that is, try to prevent the steam injected downhole from entering the "heat insulation area" in reverse, that is, the upper end formed between the o...

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Problems solved by technology

However, since this kind of thermal packer does not have the function of radial positioning, it is inconvenient to install and use laterally. They are coaxial with each other, and it is difficult to obtain the ideal sealing effect, so it cannot be directly used as a thermal insulation device for the casing of the horizontal section of the horizontal well

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