CN104121431B - A kind of wear-and corrosion-resistant liner insulated tubing - Google Patents

Abstract

The invention discloses a wear-resistant and anti-corrosion lined heat-insulating oil pipe. An inner pipe is fixedly embedded in the oil pipe, and a layer of heat-insulating layer is fixedly embedded between the oil pipe and the inner pipe to form a wear-resistant and anti-corrosion lined insulation as a whole. Hot tubing. The length of the inner pipe is longer than that of the oil pipe, and the two ends of the inner pipe protrude and wrap outside the end faces of the oil pipe. The invention can reduce the temperature loss of the crude oil itself when the crude oil flows from the bottom of the well to the wellhead, improve the flow state of the crude oil in the wellbore, and effectively solve technical problems such as partial wear of the tubing string, internal corrosion of the tubing, scaling, and wax deposition. .

Description

A wear-resistant and anti-corrosion lined heat-insulated oil pipe

technical field

The invention relates to a wear-resistant, anti-corrosion, lined and heat-insulated oil pipe suitable for places such as oil production pipe strings in oil fields, pipe strings in geothermal hot water wells, oil and gas gathering and transportation, and pipeline transportation of chemical products.

Background technique

At present, in the actual production process of oil fields, pure bare pipes (without any heat insulation measures) are generally used for production. This oil production method has the problem of a large loss of the temperature of the crude oil itself. In the anti-corrosion treatment of oil pipes, the solution is usually to apply anti-corrosion paint on the inner surface of the oil pipes. Since the rust in the oil pipes is not easy to clean and the coating is thin, there are problems such as easy peeling off of the anti-corrosion layer and short service life. To solve the eccentric wear of the rod and tube of the pumping unit, technologies such as glass lining and anti-eccentric wear wellhead are generally used. These technologies have problems such as glass lining is easily broken, anti-eccentric wear wellhead operation is heavy, and the effect of anti-eccentric wear is poor. .

Contents of the invention

The purpose of the present invention is to provide a wear-resistant and anti-corrosion lined heat-insulated oil pipe to solve the technical problem of reducing the temperature loss of the crude oil itself and improving the flow state of the crude oil in the wellbore when the crude oil flows from the bottom of the well to the wellhead; it also effectively solves the There are technical problems such as eccentric wear of the tubing rod, internal corrosion, scaling, and waxing of the tubing.

The technical scheme adopted in the present invention is as follows:

A wear-resistant and anti-corrosion lined heat-insulating oil pipe, in which an inner pipe 2 is fixedly embedded in the oil pipe 1, and a heat-insulating layer is fixedly embedded between the oil pipe 1 and the inner pipe 2 to form a heat-insulating layer 3, and the inner pipe 2 The length of the inner pipe 2 is longer than that of the oil pipe, the two ends of the inner pipe 2 are protruding and wrapped outside the end surface of the oil pipe 1, and the heat insulation layer is fixed between the inner pipe 2 and the oil pipe 1.

A layer of thin steel pipe 4 is installed between the heat insulation layer 3 and the inner pipe 2, that is, the heat insulation layer 3 and the thin steel pipe 4 are fixed between the inner pipe 2 and the oil pipe 1.

The inner tube 2 is made of thermoplastic high-density polyethylene composite material or ultra-high molecular weight polyethylene composite material, and the thickness of the inner tube is 3.5mm. The heat insulation layer 3 is an airgel nanometer super heat insulation blanket heat insulation material, and the thickness of the heat insulation layer is 3mm. The effect of the thin steel pipe 4 is to prevent the heat insulation layer from being damaged when the inner pipe is embedded, and its thickness is 0.5mm.

The invention has the advantages of effectively reducing the natural heat loss of downhole crude oil and hot water flowing from the bottom of the well to the wellhead, increasing the temperature of the crude oil at the wellhead and the temperature of the wellhead of the hot water well; Grinding and other technical problems can reduce the damage of rods and pipes, and reduce the workload of downhole operations; it can reduce the frictional resistance between the rods and pipes of the pumping unit, reduce the load of the pumping unit and achieve a more significant power-saving effect; and finally achieve energy saving and emission reduction. Reduce rod and pipe damage, reduce the workload of downhole operations, and greatly reduce the cost of oil extraction.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a sectional view along A-A direction of Fig. 1 .

Fig. 3 is a cross-sectional view along B-B direction of Fig. 1 .

detailed description

As shown in Figures 1, 2, and 3, a wear-resistant, anti-corrosion, and heat-insulated oil pipe includes an oil pipe, an anti-corrosion and wear-resistant layer inside the oil pipe, a thin steel pipe inside the oil pipe, and an oil pipe with an inner heat insulation layer. An inner pipe 2 is fixedly embedded in the oil pipe 1, and a layer of heat insulation layer 3 is fixedly embedded between the oil pipe 1 and the inner pipe 2, and a layer of thin steel pipe 4 is installed between the heat insulation layer 3 and the inner pipe 2, The length of the inner pipe 2 is longer than that of the oil pipe, and the two end faces of the inner pipe 2 protrude from the end face of the oil pipe 1 . At this time, the two ends of the wear-resistant and anti-corrosion lined heat-insulated oil pipe are the inner pipe end faces, and the outer surface of the wear-resistant and anti-corrosion lined heat-insulated oil pipe is the outer surface of the oil pipe.

In the present invention, a thermoplastic high-density polyethylene composite material or an ultra-high molecular weight polyethylene composite material with good wear resistance, anti-corrosion, anti-wax, and anti-fouling properties is fixed and embedded in the oil pipe 1 as the inner pipe 2, and the oil pipe 1 A layer of heat insulation layer 3 with good heat insulation performance is fixedly embedded between the inner pipe 2 to form a wear-resistant and anti-corrosion lined heat-insulated oil pipe with an overall structure.

The inner tube 2 is made of thermoplastic high-density polyethylene composite material or ultra-high molecular weight polyethylene composite material, and the thickness of the inner tube is 3.5mm. The heat insulation layer 3 is an airgel nanometer super heat insulation blanket heat insulation material, and the thickness of the heat insulation layer is 3mm. The effect of the thin steel pipe 4 is to prevent the heat insulation layer from being damaged when the inner pipe is embedded, and its thickness is 0.5mm.

The oil pipe (steel pipe column) described is a prior art and processed single-layer metal oil pipe (steel pipe column). The heat insulation layer is an airgel nano super heat insulation blanket heat insulation material with extremely strong heat insulation performance and extremely low thermal conductivity, which is a product in the prior art. The inner pipe is a high-density polyethylene composite pipe or an ultra-high molecular weight polyethylene composite pipe with wear-resistant, anti-corrosion, anti-wax and anti-scaling properties. It is a product of the prior art. embedded in the tubing. The two ends of the oil pipe are wrapped in the outer walls of the two ends of the inner pipe, so that the inner pipe and the heat insulation layer are embedded in the oil pipe to cooperate more firmly, and the installation can be installed in a shrink-fit butt joint method.

The ultra-high molecular weight polyethylene composite material is a high-strength, high-load-bearing, creep-resistant, heat-resistant and excellent wear-resistant material prepared by blending and modifying lubricating and wear-resistant agents, nano-heat conducting agents, and chemically cross-linking. Modified ultra-high molecular weight polyethylene wear-resistant material. For the above materials, please refer to the ultra-high molecular weight polyethylene wear-resistant composite material products of CSR Zhuzhou Times New Material Technology Co., Ltd.

The characteristics of the airgel nano-super thermal insulation blanket heat insulation material are high temperature resistance, good waterproof performance, high heat insulation suppression efficiency, can suppress heat loss of high-temperature objects, and effectively suppress heat radiation and heat conduction losses. The material uses products produced by Zhejiang Shaoxing Nano High-Tech Co., Ltd.

The thermoplastic high-density polyethylene composite material has properties of wear resistance, corrosion resistance, wax resistance and scaling resistance. The above materials are selected from the sales products of Beijing Zhongjia Tianhe Technology Development Co., Ltd.

The selection of the above materials is only an enumeration in the embodiment, and other similar products are also options of this patent.

In the present invention, a thermoplastic high-density polyethylene composite material or an ultra-high molecular weight polyethylene composite material with good wear resistance, anti-corrosion, anti-wax, and anti-fouling properties is fixed and embedded in the oil pipe 1 as the inner pipe 2, and the oil pipe 1 A layer of heat insulation layer 3 with good heat insulation performance is fixedly embedded between the inner pipe 2 to form a wear-resistant and anti-corrosion lined heat-insulated oil pipe with an overall structure. It has good heat insulation, wear resistance, anti-corrosion, anti-scaling and anti-wax performance, which can effectively increase the temperature of crude oil at the original wellhead, improve the flow state of crude oil in the wellbore, solve the partial wear of the rod and pipe, and solve the corrosion and scaling in the tubing , wax deposition, reduce the friction between the rods and pipes, reduce the load of the pumping unit, and finally achieve energy saving and emission reduction, reduce damage to rods and pipes, reduce the workload of downhole operations, and greatly reduce the cost of oil extraction.

Claims (1)

1. a wear-and corrosion-resistant liner insulated tubing, it is characterised in that in oil pipe (1) in fixing setting-in one Pipe (2), and fixing one layer of thermal insulation layer of setting-in constitutes thermal insulation layer (3) between oil pipe (1) and inner tube (2), The length of inner tube (2) is more than oil pipe, and the both ends of the surface of inner tube (2) are prominent to be wrapped in outside oil pipe (1) end face, Thermal insulation layer is fixed between inner tube (2) and oil pipe (1)；Install between thermal insulation layer (3) and inner tube (2) One layer of sheet steel pipe (4), i.e. thermal insulation layer (3) and sheet steel pipe (4) be fixed on inner tube (2) and oil pipe (1) it Between；Described inner tube (2) is that thermoplastic high density's composite polyethylene material or ultra-high molecular weight polyethylene are combined Material, interior tube thickness is 3.5mm；Thermal insulation layer (3) is aeroge nano super felt insulation heat-insulating heat-preserving material, Insulation thickness is 3mm；Being damaged by thermal insulation layer when the effect of sheet steel pipe (4) is to prevent embedded inner tube, it is thick Degree is 0.5mm.