Oil field pressure test composite pipeline

Abstract

The utility model belongs to the technical field of oil well pipelines, and particularly relates to an oil field pressure test composite pipeline. The oil field pressure test composite pipeline comprises an inner core layer, a reinforcing layer and an outer protective layer, the reinforcing layer comprises at least two steel belt winding layers, a sliding layer is arranged between every two adjacent steel belt winding layers, each sliding layer comprises a fluid layer, a spirally-wound spring wire is arranged in each fluid layer, balls penetrate through the spring wires, and the balls are evenly distributed on the spring wires; or the sliding layer is a steel wire woven mesh or a fiber woven mesh, and balls penetrate through woven nodes of the steel wire woven mesh or the fiber woven mesh; the composite pipeline is stable in pressure bearing performance, flexible and easy to coil, and has the advantages of being high in overall composite structural strength and good in pipe wall interlayer sliding effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well pipelines, and specifically relates to an oil field pressure test composite pipeline. Background Art

[0002] The high-pressure pipeline used with the oilfield pressure test pump has specific requirements. It is the connecting pipeline between the oil well control test bench and the Christmas tree. When in use, it should meet the requirements of high pressure sealing (the pipeline maintains pressure above 100MPa for more than 30 minutes) and be flexible, easy to coil, and easy to drag.

[0003] The utility model with patent number CN204986072U discloses a high-pressure pipeline for a pressure test pump, which includes an inner rubber layer, a pressure-bearing layer and an outer rubber layer structure; wherein the pressure-bearing layer is composed of two layers of spirally superimposed and wound steel plate winding tubes, and a lubricating layer is arranged between the two steel plate winding tubes, and a spring tube layer is arranged outside the outer rubber layer. The two-layer steel plate winding tube can realize pipeline winding, but the winding range is limited when the overall pipe wall is thick, and the flexibility of the pipeline is unstable; the lubricating layer is made of rubber elastic material, and it is difficult to maintain a long-term and stable interlayer sliding effect. The wound steel belts are severely worn against each other during the bending process, and are prone to displacement and delamination, which destroys the integrity of the composite structure of the pipe wall. Utility Model Content

[0004] The utility model aims to provide an oilfield pressure test composite pipeline which has stable pressure bearing performance, is flexible and easy to coil, and has the characteristics of high overall composite structure strength and good sliding effect between pipe wall layers.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An oilfield pressure test composite pipeline comprises an inner core layer, a reinforcement layer and an outer sheath, characterized in that: the reinforcement layer comprises at least two layers of steel belt winding layers, a sliding layer is arranged between adjacent steel belt winding layers, the sliding layer comprises a fluid layer, a spirally wound spring wire is arranged in the fluid layer, balls are passed through the spring wire, and the balls are evenly distributed on the spring wire; or the sliding layer is a steel wire braided mesh or a fiber braided mesh, and balls are arranged through its braiding nodes.

[0007] Additional technical features of the above-mentioned oilfield pressure test composite pipeline include:

[0008] ——The winding directions of adjacent steel strip winding layers are staggered and crossed, and the winding spacing is not less than the width of the steel strip;

[0009] ——The winding pitch of the spring wire is not less than the winding pitch of the steel strip winding layer, the diameter of the ball on the spring wire does not exceed 1 / 4 of the winding pitch of the steel strip winding layer, and the axial spacing of the balls is not more than 1 / 2 of the winding pitch of the steel strip winding layer;

[0010] ——The spring wire is made of stainless steel; the fiber braided mesh is made of polyester aramid; the ball is made of steel ball, copper ball or high-hardness ceramic;

[0011] ——The inner core layer is made of nylon polymer or rubber-plastic alloy; the outer sheath includes an inner polyurethane wear-resistant layer and an outer wire mesh armor layer; the fluid layer is silicone, silicone grease or lubricating oil.

[0012] Compared with the prior art, the oilfield pressure test composite pipeline provided by the utility model has the following advantages: the reinforcement layer of the composite pipeline includes at least two layers of steel belt winding layers, which are used to withstand the internal and external high pressures and enhance the pipeline structure; a sliding layer including a fluid layer is arranged between adjacent steel belt winding layers; a spirally wound spring wire is arranged in the fluid layer; balls are passed through the spring wire; the balls are evenly distributed on the spring wire; the fluid layers are spirally evenly distributed on the spring wire through the balls, so that the sliding effect between the steel belt winding layers can be achieved, and the utility model has long-term and stable bending and winding performance, and significantly reduces the wear resistance between layers, prolongs the service life of the pipeline, and has better flexibility and durability; at the same time, as an equivalent replacement, the sliding layer can also be a steel wire braided mesh or a fiber braided mesh, and balls are set through the braided nodes, which can also achieve uniform distribution of the balls. During the bending process of the pipeline, the balls rotate in coordination to achieve the sliding effect between the pipe wall layers, and the utility model has the advantages of simple structure, convenient processing, economy and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of an oilfield pressure test composite pipeline. DETAILED DESCRIPTION

[0014] The structure and working principle of the novel oilfield pressure test composite pipeline provided by the utility model are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] In the description of the present invention, unless otherwise specified, the terms "inside / outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set / provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0017] like Figure 1 As shown, the structure of the novel oilfield pressure test composite pipeline comprises an inner core layer 1, a reinforcement layer 2 and an outer protective layer 3, the reinforcement layer 2 comprises at least two steel belt winding layers (21, 22), a sliding layer is arranged between adjacent steel belt winding layers (21, 22), the sliding layer comprises a fluid layer 41, a spirally wound spring wire 42 is arranged in the fluid layer 41, balls 43 pass through the spring wire 42, and the balls 43 are evenly distributed on the spring wire 42; or the sliding layer is a steel wire braided mesh or a fiber braided mesh, and the balls 43 are arranged through the braided nodes.

[0018] The working principle is as follows: the reinforcing layer 2 between the inner core layer 1 and the outer sheath 3 of the composite pipeline comprises at least two steel belt winding layers (21, 22). When the pipeline is coiled, the steel belt winding layers are worn and difficult to bend, so a slip layer is added between the layers. A spirally wound spring wire 42 is arranged in the fluid layer 41 constituting the slip layer. Balls 43 pass through the spring wire 42. The balls 43 are evenly distributed on the spring wire 42, that is, the direct contact wear of the steel belt is reduced between the fluid layers, and the mutual rotation is realized by the balls 43 on the spring wire 42, so as to achieve a better interlayer slip effect and improve the flexibility and wear resistance of the pipeline.

[0019] It should be noted that the above-mentioned sliding layer can also be a wire braided mesh or a fiber braided mesh, and the braided nodes thereof are penetrated by balls 43, which are also evenly positioned and rotate in coordination during the bending process of the pipeline to achieve the purpose of interlayer sliding and reduce wear.

[0020] In the structure constituting the above-mentioned new oilfield pressure test composite pipeline,

[0021] - Preferably, the winding directions of the adjacent steel strip winding layers (21, 22) are staggered and crossed, and the winding spacing is not less than the width of the steel strip, that is, through the winding in staggered directions, the pipeline bending and winding force balance is achieved, the strength of the pipe wall structure is further increased, and both skeleton support and flexibility effects are achieved. At the same time, the steel strip winding should not be too dense, and the winding spacing is generally not less than the width of the steel strip, so as to effectively maintain a good winding performance;

[0022] - Further, the winding pitch of the spring wire 42 is not less than the winding pitch of the steel strip winding layers (21, 22), the diameter of the balls 43 on the spring wire 42 is not more than 1 / 4 of the winding pitch of the steel strip winding layers (21, 22), and the axial spacing of the balls 43 is not more than 1 / 2 of the winding pitch of the steel strip winding layers (21, 22), that is, the balls 43 are evenly distributed between the steel strip winding layers, and effectively rotate according to the bending of the pipeline, so that the diameter of the balls 43 and the winding pitch are matched to achieve a better interlayer sliding effect;

[0023] ——The spring wire 42 is made of stainless steel, maintaining good mechanical strength and flexibility; the fiber braided mesh is made of polyester aramid, which protects the inner core layer 1, withstands the internal pressure of the conveying, and has a skeleton support effect; the ball 43 is made of steel ball, copper ball or high-hardness ceramic, which has high hardness, wear resistance, stable appearance, and can maintain a long-term rolling effect;

[0024] ——Furthermore, the inner core layer 1 is made of nylon polymer or rubber-plastic alloy; the outer sheath 3 includes an inner polyurethane wear-resistant layer 31 and an outer wire mesh armor layer 32, and the wire mesh armor layer 32 can be formed by woven meshes of metal fibers, chemical fibers, etc. or by winding, which improves the tube bundle concentration and pressure-bearing and pressure-resistant effects; the fluid layer 41 is silicone, silicone grease or lubricating oil, that is, the fluid layer 41 is in a non-solid state, which avoids direct contact and wear of the steel winding layer, and can keep the ball 43 flexible in rotation, maintaining a long-term interlayer sliding effect.

[0025] The above-described implementation modes are only used to illustrate the technical solution of the utility model, and are not limiting conditions for the implementation of the utility model. Therefore, any other modifications or equivalent replacements of configuration dimensions and internal structures made to the technical solution of the utility model, as long as they do not depart from the spirit and scope of the technical solution of the utility model, should be included in the scope of the claims of the utility model.

Claims

1. An oilfield pressure test composite pipeline, comprising an inner core layer, a reinforcement layer and an outer protective layer, characterized in that: The reinforcing layer includes at least two layers of steel belt winding layers, a sliding layer is arranged between adjacent steel belt winding layers, the sliding layer includes a fluid layer, a spirally wound spring wire is arranged in the fluid layer, balls are passed through the spring wire, and the balls are evenly distributed on the spring wire; or the sliding layer is a steel wire woven mesh or a fiber woven mesh, and balls are set through its woven nodes.

2. The oilfield pressure test composite pipeline according to claim 1, characterized in that: The winding directions of adjacent steel strip winding layers are staggered and crossed, and the winding spacing is not less than the width of the steel strip.

3. An oilfield pressure test composite pipeline according to claim 1 or 2, characterized in that: The winding pitch of the spring wire is not less than the winding pitch of the steel strip winding layer, the diameter of the balls on the spring wire does not exceed 1 / 4 of the winding pitch of the steel strip winding layer, and the axial spacing of the balls is not greater than 1 / 2 of the winding pitch of the steel strip winding layer.

4. The oilfield pressure test composite pipeline according to claim 1, characterized in that: The spring wire is made of stainless steel; the fiber braided net is made of polyester aramid; and the ball is made of steel ball, copper ball or high-hardness ceramic.

5. The oilfield pressure test composite pipeline according to claim 1, characterized in that: The inner core layer is made of nylon polymer or rubber-plastic alloy; the outer protective layer includes an inner polyurethane wear-resistant layer and an outer wire mesh armor layer; and the fluid layer is silica gel, silicone grease or lubricating oil.

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