Heat-preservation wear-resistant oil pipe for oil well

Abstract

The invention provides a thermal-insulation wear-resistant oil pipe for an oil well, which comprises a plurality of thermal-insulation pipe bodies and an umbrella-shaped counterweight device, the head end of one thermal-insulation pipe body is detachably and fixedly connected with the umbrella-shaped counterweight device, and the tail end of the thermal-insulation pipe body is connected with a plurality of thermal-insulation pipe bodies; the umbrella-shaped balance weight device can be closed to be hung at one end of the pipe body, serves as a balance weight part, assists the heat preservation pipe body in keeping a vertical downward state in the process of going deep into an oil well, assists the pipe body in righting, and serves as a filter screen to filter impurities in the oil well when the heat preservation pipe body makes contact with petroleum in the oil well. Impurities in petroleum in an oil well mainly comprise mechanical impurities, wax, mud sand, asphaltene, colloid and the like, so that the purity of the petroleum entering the thermal insulation pipe body is reduced, and the blockage problem of the thermal insulation pipe body is reduced.

Description

Technical Field

[0001] The present invention relates to a heat-insulating and wear-resistant oil pipe for oil wells, belonging to the field of oil transportation pipelines. Background Art

[0002] An oil well is a passage from the bottom of an oil reservoir to the wellhead, which is a hole drilled by a drilling method. Generally, after an oil well reaches the oil layer, an oil layer casing is lowered, and oil well cement is injected into the annular space between the casing and the well wall to maintain the well wall and seal the oil, gas, and water layers. Then, according to the requirements of oilfield development, a perforating gun is used to perforate the oil layer to form a passage, an oil pipe is lowered, and an appropriate flow induction method is used to lift the oil from the bottom of the oil well to the wellhead.

[0003] The vertical depth of a conventional onshore oil well is 1000 - 6000 meters. The depth of a shale oil or gas well or an offshore oil well may be deeper, and the wellhead diameter is usually about 10 cm to 30 cm. Therefore, during the process of the pipeline extending deep into the bottom of the oil well, it is inevitable to collide with the inner wall of the oil well, and the surface of the oil pipe will be worn. The wear will cause scratches, depressions, and even holes and cracks on the surface of the oil pipe, and even the oil pipe will leak, affecting the normal production of the oil well.

[0004] Secondly, there is a temperature difference between the temperature 1000 meters underground and the temperature on land. If the temperature difference is too large, once the oil leaks to the outside and encounters a fire source or an energy source, an explosion may occur. Therefore, heat insulation treatment needs to be carried out on the oil pipeline.

[0005] Therefore, the present application provides a heat-insulating and wear-resistant oil pipe for oil wells that can quickly straighten the oil pipeline and has a heat insulation effect. Summary of the Invention

[0006] The present invention provides a heat-insulating and wear-resistant oil pipe for oil wells, which can effectively solve the above problems.

[0007] The present invention is implemented as follows:

[0008] A heat-insulating and wear-resistant oil pipe for oil wells includes a plurality of heat-insulating pipe bodies and an umbrella-shaped counterweight. One end of the heat-insulating pipe body is detachably and fixedly connected to the umbrella-shaped counterweight, and the other end of this heat-insulating pipe body is connected to a plurality of heat-insulating pipe bodies.

[0009] Among them, the umbrella-shaped counterweight includes a counterweight ball, a traction wire, and a ring bracket. The counterweight ball is rotatably connected to the inside of the ring bracket through a support rod, and a traction wire is tied to the counterweight ball. The free end of the traction wire passes through the heat-insulating pipe body until it is exposed on the land surface.

[0010] It also includes a folding net. The folding net is in the shape of a frustum of a cone with hollow upper and lower ends. One end of the folding net is rotatably connected to the ring bracket, and the other end is rotatably connected to the heat-insulating pipe body.

[0011] As a further improvement, the folding net is a net-like structure formed by cross-welding a number of flexible metal wires.

[0012] As a further improvement, the folding net is composed of a number of umbrella ribs. Each umbrella rib is formed by connecting at least two or more rotating rods. One end of each umbrella rib is rotatably connected to the ring bracket, and the other end is rotatably connected to the outer wall of the head end of the heat preservation pipe body.

[0013] As a further improvement, a barb is hung at the end of the umbrella rib connected to the outer wall of the head end of the heat preservation pipe body.

[0014] As a further improvement, the cross-sectional shape of the umbrella rib is triangular, and the triangular edge of the umbrella rib always faces downwards.

[0015] As a further improvement, the length of the umbrella rib is at least 3 cm or more than 3 cm.

[0016] As a further improvement, the umbrella rib is made of chrome alloy steel material.

[0017] As a further improvement, the heat preservation pipe body comprises a first pipe body and a second pipe body located in the first pipe body;

[0018] A seal and an inflation layer. The seal is installed at one end of the heat preservation pipe body for closing and connecting the first pipe body and the second pipe body. The gap between the first pipe body and the second pipe body is the inflation layer.

[0019] As a further improvement, the seal is in the shape of a hollow frustum, and protrusions are provided at an inclined angle on the end faces of the seal.

[0020] As a further improvement, the seal is made of a flame-retardant material.

[0021] The beneficial effects of the present invention are as follows:

[0022] ① The umbrella-shaped counterweight of the present invention can be folded and hung at one end of the pipe body, acting as a counterweight to assist the heat preservation pipe body to maintain a vertical state during the process of entering the oil well deeply, assisting in straightening the pipe body. When the heat preservation pipe body contacts the oil in the oil well, it acts as a filter to filter out impurities in the oil well. For example, the impurities existing in the oil in the oil well mainly include mechanical impurities, wax, mud, asphalt and gum, etc., reducing the purity of the oil entering the heat preservation pipe body and reducing the blockage problem of the heat preservation pipe body.

[0023] ② An inert gas is filled in the inflation layer between the first pipe body and the second pipe body to play a heat preservation role. When the pipeline leaks, the inert gas will also be released into the air, forming a short-term closed gas layer in the narrow oil well channel, giving the staff reaction time to make timely responses and replace the heat preservation pipe body.

[0024] ③ If the seal on the bottommost heat-insulating pipe body is lost, it does not affect the normal operation of the heat-insulating pipe body. On the contrary, after the heat-insulating pipe body comes into contact with petroleum, the petroleum can also serve as a gas seal layer. When inert gas is injected into the petroleum, it can also expel the oxygen in the petroleum, reduce the oxygen content, and reduce the risks of fire and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 FIG. is a schematic structural diagram of a heat-insulating and wear-resistant oil pipe for oil wells provided by an embodiment of the present invention.

[0027] Figure 2 FIG. is a schematic cross-sectional view of a heat-insulating and wear-resistant oil pipe for oil wells provided by an embodiment of the present invention Figure 1 .

[0028] Figure 3 FIG. is a schematic cross-sectional view of a heat-insulating and wear-resistant oil pipe for oil wells provided by an embodiment of the present invention Figure 2 .

[0029] Figure 4 FIG. is a schematic plan view of an umbrella-shaped counterweight of a heat-insulating and wear-resistant oil pipe for oil wells provided by an embodiment of the present invention.

[0030] Figure 5 FIG. is a schematic structural diagram of A in the present invention Figure 2 in the present invention.

[0031] Figure 6 FIG. is a schematic structural diagram of a seal of a heat-insulating and wear-resistant oil pipe for oil wells provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0034] Example 1

[0035] Referring to Figures 1-6 As shown, this embodiment provides a specific implementation of a heat-insulating and wear-resistant oil pipe for oil wells, which includes a number of heat-insulating pipe bodies 10 and an umbrella-shaped counterweight 20. One end of the head of one of the heat-insulating pipe bodies 10 is detachably and fixedly connected to the umbrella-shaped counterweight 20, and the tail end of this heat-insulating pipe body 10 is connected to a number of heat-insulating pipe bodies 10. The umbrella-shaped counterweight 20 of the present invention can be closed and hung at one end of the pipe body 10 to act as a counterweight, assisting the heat-insulating pipe body 10 to maintain a vertical state during the process of entering the oil well deeply, assisting in straightening the pipe body. When the heat-insulating pipe body 10 contacts the petroleum in the oil well, it acts as a filter to filter out impurities in the oil well. For example, the impurities existing in the petroleum in the oil well mainly include mechanical impurities, wax, mud, asphaltene, and colloid, etc., reducing the purity of the petroleum entering the heat-insulating pipe body 10 and reducing the blockage problem of the heat-insulating pipe body 10;

[0036] Among them, the umbrella-shaped counterweight 20 includes a counterweight ball 201, a traction wire 202, and a ring bracket 203. The counterweight ball 201 is rotatably connected to the inside of the ring bracket 203 through a support rod, and a traction wire 202 is tied to the counterweight ball 201. The free end of the traction wire 202 passes through the heat-insulating pipe body 10 until it is exposed on the land surface, used to pull the counterweight ball 201. While changing the height of the counterweight ball 201, it also changes the shape of the folding net 204;

[0037] It also includes a folding net 204, which is frustum-shaped with hollow upper and lower ends. One end of the folding net 204 is rotatably connected to the ring bracket 203, and the other end is rotatably connected to the heat preservation pipe body 10. The folding net 204 presents a funnel shape, expanding the contact area with the petroleum. The wider the contact area, the more convenient it is for filtering or cutting the colloid in the oil well.

[0038] In this embodiment, the folding net 204 is composed of a number of umbrella ribs 241. Each umbrella rib 241 is formed by connecting at least two or more rotating rods 241-1. And one end of each umbrella rib 241 is rotatably connected to the ring bracket 203, and the other end is rotatably connected to the outer wall of the head end of the heat preservation pipe body 10. When the counterweight ball 201 rises from the outside of the heat preservation pipe body 10 to the inside of the heat preservation pipe body 10, the folding net 204 can also change its shape synchronously, avoiding the folding net 204 restricting the rise of the counterweight ball 201.

[0039] In this embodiment, barbs are hung at the end of the umbrella rib 241 connected to the outer wall of the head end of the heat preservation pipe body 10. When the counterweight ball 201 is at the lowest end, that is, in the installation or disassembly state, it can grip the outer wall of the pipe tightly. Even if the heat preservation pipe body 10 touches the inner wall of the oil well, it will be separated by the umbrella rib 241, reducing the generation of damaged parts at the end of the heat preservation pipe body 10.

[0040] In this embodiment, the cross-sectional shape of the umbrella rib 241 is triangular, and the triangular edges of the umbrella rib 241 always face downward, cutting the colloid in the petroleum more quickly. The cut colloid fragments will not easily block the pipeline when being pumped to the land by the petroleum pipeline, and the pressure applied during pipeline pumping does not need to be so large.

[0041] In other embodiments, the cross-sectional shape of the umbrella rib 241 is circular, and it also has the function of cutting the colloid in the petroleum. The cylindrical umbrella rib 241 is easier to process, the casting process is mature, and the cost is low.

[0042] In this embodiment, the length of the umbrella rib 241 is at least 3 cm or more. Compared with the oil well opening which is only about 10 cm to 30 cm, it can penetrate deeper into the oil well, and the process of unfolding and folding will not affect the use of the heat preservation pipe body 10.

[0043] In this embodiment, the umbrella rib 241 is made of chromium alloy steel. Chromium alloy steel refers to alloy steel containing chromium. Chromium can increase the hardenability of the steel, improve the strength and wear resistance of the steel. After adding chromium elements to chromium alloy steel, the corrosion resistance of the steel can be significantly improved. Chromium can react with oxygen to form a dense chromium oxide passivation film, which can effectively resist the erosion of various corrosive media, especially for strongly oxidizing media and high-temperature environments.

[0044] In this embodiment, the heat-insulating pipe body 10 is composed of a first pipe body 101 and a second pipe body 102 located in the first pipe body 101;

[0045] A seal 103 and an inflation layer 104, the seal 103 is installed at one end of the heat-insulating pipe body 10 for closing and connecting the first pipe body 101 and the second pipe body 102, and the gap between the first pipe body 101 and the second pipe body 102 is the inflation layer 104.

[0046] In the above technical solution, the heat-insulating pipe body 10 is divided into an inner and an outer layer. Even when the pipe penetrates deep into the bottom of the oil well, it will collide with the inner wall of the oil well, and the surface of the oil pipe will be worn. The wear will cause scratches, depressions, and even holes and cracks on the surface of the oil pipe, but it will not cause the problem of oil pipe leakage;

[0047] Secondly, an inert gas is filled in the inflation layer 104 between the first pipe body 101 and the second pipe body 102 to play a heat-insulating role. When the pipe leaks, the inert gas will also be released into the air, forming a short-term closed gas layer in the narrow oil well channel, giving the staff reaction time to react in time and replace the heat-insulating pipe body 10.

[0048] Furthermore, the seal 103 is in the shape of a hollow frustum, and protrusions are provided at an inclined angle on the end face of the seal 103.

[0049] Furthermore, the seal 103 is made of a flame-retardant material, which has been specially treated or added with flame retardant components on the basis of conventional materials; including but not limited to flame-retardant carbon fiber composite materials. Carbon fiber itself has high strength and modulus, but also has a certain degree of flexibility. When subjected to external forces, carbon fiber can undergo elastic deformation to a certain extent and can return to its original shape when the external force disappears.

[0050] It is suitable to be installed between two first pipe bodies 101 and the second pipe body 102 to play a sealing role. After penetrating into the oil, even if it is lost, the oil, as a liquid, can serve as a gas sealing layer. Injecting inert gas into the oil can also expel oxygen in the oil, reduce the oxygen content, and reduce the risk of fire and explosion.

[0051] In summary, the heat-insulating pipe body 10 of the present invention has a heat-insulating function, a function of being damaged after anti-collision, and also takes into account the function of straightening the disassembly, installation and installation of the heat-insulating pipe body 10 to assist the heat-insulating pipe body 10 to penetrate deep into the oil well.

[0052] Embodiment 2

[0053] This embodiment is different from Embodiment 1 in that the structure of the folding net is different. The folding net 204 is a net structure formed by cross-welding a number of flexible metal wires, which can deform under the action of external force and deform correspondingly with the lifting and lowering of the counterweight ball 201.

[0054] The effect achieved by this embodiment is the same as that of Embodiment 1. For the structure names, connection relationships, and effects not mentioned in this embodiment, reference can be made to Embodiment 1, and this embodiment will not be elaborated.

[0055] Embodiment 3

[0056] A method for using an oil well heat-insulating and wear-resistant oil pipe, based on Embodiment 1 or Embodiment 2, includes the following steps:

[0057] Step 1, oil well evaluation: Collect geological data of the oil well, including formation structure, rock properties, pressure, temperature and other information, and select a suitable type, specification and installation plan of the heat-insulating pipe body 10;

[0058] Step 2: Prepare the lifting equipment for the heat-insulating pipe body 10, the connecting tools for the heat-insulating pipe body 10, sealing materials and other auxiliary tools, and set up a heat-insulating pipe body 10 centering device and a guiding device at the wellhead so that the heat-insulating pipe body 10 can be accurately and smoothly lowered into the well;

[0059] Step 3: Install the umbrella-shaped counterweight 20, connect a number of heat-insulating pipe bodies 10, and use the lifting equipment to slowly lower the connected heat-insulating pipe bodies 10 into the well; during the lowering process, due to gravity, the presence of the counterweight ball 201 in the umbrella-shaped counterweight 20 will assist in keeping the heat-insulating pipe body 10 vertical and stable, avoiding collision and friction with the well wall; every time a certain length of the heat-insulating pipe body 10 is lowered, it is necessary to carry out hanging and fixing to ensure the accurate and stable position of the heat-insulating pipe body 10 in the well; at the same time, record the lowering depth and quantity of the heat-insulating pipe body 10; until the umbrella-shaped counterweight 20 contacts the oil;

[0060] Step 4: When the heat-insulating pipe body 10 is lowered to the predetermined depth, raise the position of the counterweight ball 201 in the umbrella-shaped counterweight 20, use the umbrella-shaped counterweight 20 as a filter and a dividing part, and use tools such as packers to seal the annular space between the heat-insulating pipe body 10 and the casing to prevent media such as oil, gas, and water from flowing in the annulus; perform final tightening and sealing treatment on the wellhead device to ensure the sealing and stability of the entire oil pipe system.

[0061] In Step 4, if the seal 103 on the lowermost heat-insulating pipe body 10 is lost, it does not affect the normal operation of the heat-insulating pipe body 10. On the contrary, after the heat-insulating pipe body 10 contacts the oil, the oil can also serve as a gas sealing layer. Injecting inert gas into the oil can also expel the oxygen in the oil, reduce the oxygen content, and reduce the risk of fire and explosion.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat-insulating and wear-resistant tubing for oil wells, characterized in that, It includes a number of heat preservation pipe bodies (10) and an umbrella-shaped counterweight (20). One end of the first heat preservation pipe body (10) is detachably and fixedly connected to the umbrella-shaped counterweight (20), and the other end of this heat preservation pipe body (10) is connected to a number of heat preservation pipe bodies (10). Among them, the umbrella-shaped counterweight (20) includes a counterweight ball (201), a traction wire (202), and a ring bracket (203). The counterweight ball (201) is rotatably connected to the inside of the ring bracket (203) through a support rod, and a traction wire (202) is tied to the counterweight ball (201). The free end of the traction wire (202) passes through the heat preservation pipe body (10) until it is exposed on the land surface. It also includes a folding net (204). The folding net (204) is in the shape of a frustum with hollow upper and lower ends. One end of the folding net (204) is rotatably connected to the ring bracket (203), and the other end is rotatably connected to the heat preservation pipe body (10).

2. The heat-insulating and wear-resistant tubing for oil wells according to claim 1, wherein, The folding net (204) is a net structure formed by cross-welding a number of flexible metal wires.

3. The heat-insulating and wear-resistant tubing for oil wells according to claim 1, characterized in that, The folding net (204) is composed of a number of umbrella ribs (241). Each umbrella rib (241) is connected by at least two or more rotating rods (241-1). One end of each umbrella rib (241) is rotatably connected to the ring bracket (203), and the other end is rotatably connected to the outer wall of the first end of the heat preservation pipe body (10).

4. The thermal insulation and wear-resistant tubing for oil wells according to claim 3, wherein Barbs are hung on the end of the umbrella rib (241) connected to the outer wall of the first end of the heat preservation pipe body (10).

5. The heat-insulating and wear-resistant tubing for oil wells according to claim 3, characterized in that, The cross-sectional shape of the umbrella rib (241) is triangular, and the triangular edges of the umbrella rib (241) always face downwards.

6. The heat-insulating and wear-resistant tubing for oil wells according to claim 3, wherein The length of the umbrella rib (241) is at least 3 cm or more than 3 cm.

7. The thermal insulation and wear-resistant tubing for oil wells according to claim 1, wherein, The umbrella rib (241) is made of chromium alloy steel material.

8. The heat-insulating and wear-resistant tubing for oil wells according to claim 1, characterized in that, The heat preservation pipe body (10) is composed of a first pipe body (101) and a second pipe body (102) located in the first pipe body (101). A seal (103) and an inflation layer (104). The seal (103) is installed at one end of the heat preservation pipe body (10) to seal and connect the first pipe body (101) and the second pipe body (102). The gap between the first pipe body (101) and the second pipe body (102) is the inflation layer (104).

9. The heat-insulating and wear-resistant tubing for oil wells according to claim 8, characterized in that, The seal (103) is in the shape of a hollow frustum, and protrusions are provided at an inclined angle on the end faces of the seal (103).

10. The thermal insulation and wear-resistant tubing for oil wells according to claim 1, wherein, The seal (103) is made of a flame-retardant material.

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