Pressure-resistant lining heat insulation oil pipe

Abstract

The invention discloses a pressure-resistant lining heat insulation oil pipe. The pressure-resistant lining heat insulation oil pipe comprises an oil pipe body, oil pipe couplings, a pressure-bearinginner pipe and a heat insulation layer, wherein the heat insulation layer is embedded in the outer side of the pressure-bearing inner pipe and then penetrates into the oil pipe; the pressure-bearing inner pipe and the heat insulation layer are fixed and the two ends of the pressure-bearing inner pipe are sealed in a welding sealing mode and a fixing mode that a sealing device is screwed down through a nut pressing ring; and finally, a plurality of oil pipes are connected together through the oil pipe couplings to be used in a well. By the adoption of the pressure-resistant lining heat insulation oil pipe, the loss of the temperature of crude oil in the process that the crude oil is lifted from the bottom of the well to a wellhead can be effectively reduced, the viscosity, wax deposition and flow state of the crude oil in a shaft are improved, the temperature of the crude oil in the shaft and the wellhead is increased by 15-25 DEG C, the load of an oil pumping unit is reduced, and therefore the problems of oil well hot washing, various chemical prevention agents adding, electric heating viscosity reduction, greatly simplified ground gathering and transportation technological processand the like are solved, and finally the purposes of saving energy, reducing emission, increasing income and efficiency and reducing oil exploitation cost are achieved.

Description

technical field [0001] The invention relates to the technical field of oil exploitation equipment, in particular to a pressure-resistant lining heat-insulating oil pipe. Background technique [0002] At present, in the actual production process of oilfields, the pure bare pipe string oil production transmission method is generally adopted. In the pure bare pipe string oil production method, crude oil flows out from deep oil reservoirs with high natural temperature, and is mechanically lifted along the pipe string. In the process of flowing from bottom to top to the wellhead, part of its own temperature (heat) is lost to the shallow formation through the tubing string and the annulus of the oil casing, resulting in serious wax deposition, increased viscosity, and fluidity changes in the crude oil in the upper tubing string. Poor, bringing many technical problems to normal production. [0003] In recent years, people have been researching and gradually using heat-insulated tu...

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Problems solved by technology

[0002] At present, in the actual production process of oilfields, the pure bare pipe string oil production transmission method is generally adopted. In the pure bare pipe string oil production method, crude oil flows out from deep oil reservoirs with high natural temperature, and is mechanically lifted along the pipe string. In the process of flowing from bottom to top to the wellhead, part of its own temperature (heat) is lost to the shallow formation through the tubing string and the annulus of the oil casing, resulting in serious wax deposition, increased viscosity, and fluidity changes in the crude oil in the upper tubing string. Poor, bringing many technical problems to normal production

[0003] In recent years, people have been researching and gradually using heat-insulated tubing strings to solve the problem of temperature loss when using pure plain tubing strings, and achieved certain results. The problem of the normal use of the pipe string under complex wellbore conditions

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