Composite oil pipe with wear-resisting lining and externally-wrapping heat-insulation and heat-preservation layer

Abstract

The invention discloses a composite oil pipe with a wear-resisting lining and an externally-wrapping heat-insulation and heat-preservation layer. The composite oil pipe is composed of a steel oil pipe body, an anticorrosion wear-resisting layer in the oil pipe body, a heat-insulation and heat-preservation layer on the external side of the oil pipe body, a sizing protective belt on the external side of the heat-insulation and heat-preservation layer, an external-layer protective pipe body on the external side of the sizing protective belt and two butted semi-circular heat-insulation pipe shells at an oil pipe coupling connection operating section. An inner pipe body is embedded in the oil pipe body to serve as the anticorrosion wear-resisting layer in the oil pipe body; the oil pipe external wall of a middle section of the oil pipe body is uniformly wrapped with the heat-insulation and heat-preservation layer, the heat-insulation and heat-preservation layer is wound with the sizing protective belt, and the external-layer protective pipe body and a displacement prevention forcing sealing device are arranged on the external side of the sizing protective belt; and the two butted semi-circular heat-insulation pipe shells and trapezoidal sealing rubber rings are mounted at the oil pipe operating section. According to the composite oil pipe with the wear-resisting lining and the externally-wrapping heat-insulation and heat-preservation layer, the loss of the crude oil self-temperature can be effectively reduced in the process that crude oil is lifted from the well bottom to a well mouth, and the problems of wax precipitation, scale formation, rod and pipe eccentric wear, pumping unit load reduction and the like can be effectively solved.

Description

technical field [0001] The invention relates to a wear-resistant inner lining and a thermal insulation composite oil pipe wrapped outside which is suitable for oil production pipe strings of mechanical oil production wells in oil fields and pipe strings of underground hot water wells. Background technique [0002] At present, in the actual production process of oilfields, the pure plain pipe string oil production transmission method is generally adopted (without any oil pipe heat insulation and anti-eccentric wear measures), and the pure bare pipe string is also used to mine underground hot water wells. The way of hot water, these oil recovery and hot water recovery methods all have the problem of a large amount of underground natural heat energy being wasted and underutilized. Pure light pipe string oil production method specifically has the problem that when the crude oil with high natural temperature in deep layers is lifted to the wellhead by mechanical lifting, the temp...

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Problems solved by technology

[0002] At present, in the actual production process of oilfields, the pure plain pipe string oil production transmission method is generally adopted (without any oil pipe heat insulation and anti-eccentric wear measures), and the pure bare pipe string is also used to mine underground hot water wells. The method of hot water, these methods of oil production and hot water production all have the problem of a large amount of underground natural heat energy being wasted and underutilized

Pure light pipe string oil production method specifically has the problem that when the crude oil with high natural temperature in deep layers is lifted to the wellhead by mechanical lifting, the temperature of the crude oil itself will lose a lot, which will make the crude oil fluidity in the wellbore poor and waxy, resulting in an increase in the load of the pumping unit In severe cases, it is necessary to wash the well with hot water, use electric heating to increase the temperature of the crude oil at the wellhead, and add various chemical viscosity reducers and wax removers to reduce viscosity and remove wax; specifically, there are partial wear of rods and pipes, and large frictional resistance between rods and pipes , fouling, serious damage to rods and pipes and other technical problems, increase the production cost of oil production, waste electric energy and heat energy of the heating furnace of the ground gathering and transportation system

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