Wear-resistant and heat-insulating lined composite oil pipe

Abstract

The invention discloses a wear-resisting and heat-insulating lined composite oil pipe. The multifunctional composite oil pipe is composed of an anti-eccentric wear lining pipe, a pressure-bearing inner pipe, a heat-insulating layer, a steel oil pipe, an anti-slide forced sealing device and a forced sealing device from inside to outside, wherein the anti-slide forced sealing device and the forced sealing device are arranged at two ends of the oil pipe correspondingly; and a plurality of machined oil pipes are connected through oil pipe couplings so as to be used underground. According to the wear-resisting and heat-insulating lined composite oil pipe, the eccentric wear of rods and pipes in oil wells is solved, the temperature loss of crude oil in the process of lifting the crude oil from the bottom to the opening of a well is reduced, the crude oil temperature at the wellbore and the well opening is increased, the flow state of crude oil in the wellbore is improved after wax deposition and scaling in the oil pipe, the load of pumping units is reduced, heat washing of the oil wells and adding of chemical control agents are not needed, the ground gathering and transportation process is simplified, and conveying without heating single pipes is achieved. Finally, the purposes of saving energy, reducing emission, increasing income, improving efficiency and greatly reducing the oil exploitation cost are achieved.

Description

technical field [0001] The invention relates to a wear-resistant, heat-insulating and heat-preserving composite oil pipe suitable for use in oil production pipe strings and geothermal hot water well pipe strings. A multi-functional composite tubing that solves problems such as eccentric wear of rods and tubes in wellbore. technical background [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 w...

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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 makes 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; at the same time, there are partial wear of rods and pipes, and frictional resistance between rods and pipes Technical problems such as large size, fouling, serious rod damage, waste of electric energy, and heat energy of the heating furnace of the ground gathering and transportation system

[0003] In the field of extra-heavy oil production, the oil recovery method of injecting heat carrier above 200°C is adopted, and the heat-insulated oil pipe with bimetallic vacuum pumping and nitrogen injection is used. This kind of heat-insulated oil pipe has high cost and large size, and cannot be used in conventional oil production wells. use

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