Thermal and wear resistant tubing for oil wells

Abstract

The application provides a heat-insulating wear-resistant oil pipe for oil well, which comprises a plurality of heat-insulating pipe bodies and umbrella-shaped weight devices, wherein one end of one of the heat-insulating pipe bodies is detachably fixedly connected with an umbrella-shaped weight device, and the tail end of the heat-insulating pipe body is connected with a plurality of heat-insulating pipe bodies; the umbrella-shaped weight device can be hung at one end of the pipe body to serve as a weight device, which helps the heat-insulating pipe body keep vertical during the process of going into the oil well, and helps the pipe body keep straight; when the heat-insulating pipe body contacts the oil in the oil well, the umbrella-shaped weight device serves as a filter screen to filter out the impurities in the oil well, such as mechanical impurities, waxes, mud, asphalt and colloid, so as to reduce the purity of the oil entering the heat-insulating pipe body and reduce the blockage of the heat-insulating pipe body.

Description

Technical Field

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

[0002] An oil well is a channel through which oil flows from the bottom of the well to the wellhead, formed by drilling. Generally, after drilling to the oil layer, an oil layer casing is run in, 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 open the oil layer, forming a channel. Tubing is then run in, and an appropriate flow-inducing method is used to rise the oil from the bottom of the well to the wellhead.

[0003] Conventional onshore oil wells have a vertical depth of 1,000-6,000 meters. Shale oil, gas, or offshore oil wells may be even deeper. The wellhead diameter is usually around 10 to 30 centimeters. Therefore, as the pipeline extends into the bottom of the oil well, it is inevitable that it will collide with the inner wall of the well. The surface of the pipeline will be worn, resulting in scratches, dents, holes, cracks, or even leakage, which will affect the normal production of the oil well.

[0004] Secondly, there is a temperature difference between the ground 1,000 meters below the surface and the surface temperature. If the temperature difference is too large, once the oil leaks to the outside, it may explode if it comes into contact with a source of fire or energy. Therefore, it is necessary to insulate the oil pipeline.

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

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

[0007] This invention is implemented as follows:

[0008] A heat-insulated and wear-resistant oil pipe for oil wells includes a number of heat-insulated pipe bodies and an umbrella-shaped counterweight, wherein the umbrella-shaped counterweight is detachably and fixedly connected to the head end of one of the heat-insulated pipe bodies, and the tail end of this heat-insulated pipe body is connected to several heat-insulated pipe bodies.

[0009] The umbrella-shaped counterweight includes a counterweight ball, a traction line, and a ring support. The counterweight ball is rotatably connected to the inside of the ring support via a support rod, and a traction line is attached to the counterweight ball. The free end of the traction line passes through the insulation pipe until it is exposed on the land surface.

[0010] It also includes a folded mesh, which is a frustum-shaped structure with hollow upper and lower ends. One end of the folded mesh is rotatably connected to a ring support, and the other end is rotatably connected to the insulation pipe body.

[0011] As a further improvement, the folded mesh is a mesh structure formed by cross-welding several flexible metal wires.

[0012] As a further improvement, the folded net is composed of several umbrella ribs, each umbrella rib being formed by at least two rotating rods connected together, and one end of each umbrella rib being rotatably connected to the ring support, and the other end being rotatably connected to the outer wall of the first end of the heat-insulating pipe body.

[0013] As a further improvement, a barb is attached to the rib on the outer wall of the insulated pipe head.

[0014] As a further improvement, the umbrella rib has a triangular cross-sectional shape, with the triangular edges of the rib always facing downwards.

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

[0016] As a further improvement, the umbrella ribs are made of chromium alloy steel.

[0017] As a further improvement, the heat-insulating pipe body comprises a first pipe body and a second pipe body located within the first pipe body;

[0018] The sealing element and the air-filled layer are provided. The sealing element is installed at one end of the insulated pipe body and is used to seal and connect the first pipe body and the second pipe body. The gap between the first pipe body and the second pipe body is the air-filled layer.

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

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

[0021] The beneficial effects of this invention are:

[0022] ① The umbrella-shaped counterweight of the present invention can be folded up and suspended at one end of the pipe body to act as a counterweight, helping the insulated pipe body to maintain a vertical state during the process of penetrating the oil well, and helping to straighten the pipe body. When the insulated pipe body comes into contact with the oil in the oil well, it acts as a filter screen to filter out impurities in the oil well, such as mechanical impurities, wax, mud, sand, asphalt, and colloids, thereby reducing the purity of the oil after entering the insulated pipe body and reducing the clogging problem of the insulated pipe body.

[0023] ② The air-filled layer between the first and second pipe bodies is filled with inert gas, which serves as insulation. When the pipeline leaks, the inert gas will also be released into the air, forming a temporarily sealed air layer in the narrow oil well passage, giving the staff time to react and replace the insulated pipe body in time.

[0024] ③ If the seal on the bottommost insulation pipe is lost, it will not affect the normal operation of the insulation pipe. On the contrary, after the insulation pipe comes into contact with oil, the oil can also act as a gas sealing layer. The inert gas injected into the oil can also expel the oxygen in the oil, reduce the oxygen content, and reduce the risk of fire and explosion. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used 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 should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an insulated and wear-resistant oil pipe for oil wells provided in an embodiment of the present invention.

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

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

[0029] Figure 4 This is a schematic plan view of an umbrella-shaped counterweight for an insulated and wear-resistant oil pipe used in oil wells, provided by an embodiment of the present invention.

[0030] Figure 5 This is the present invention. Figure 2 A schematic diagram of the structure of A in the middle.

[0031] Figure 6 This is a schematic diagram of the sealing structure of an insulated and wear-resistant oil pipe for oil wells provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1

[0035] Reference Figures 1-6 As shown, this embodiment provides a specific implementation of a heat-insulated and wear-resistant oil pipe for oil wells, including a plurality of heat-insulated pipe bodies 10 and an umbrella-shaped counterweight 20. The umbrella-shaped counterweight 20 is detachably and fixedly connected to the first end of one of the heat-insulated pipe bodies 10, and the tail end of this heat-insulated pipe body 10 is connected to several heat-insulated pipe bodies 10. The umbrella-shaped counterweight 20 of the present invention can be folded up and suspended at one end of the pipe body 10 to act as a counterweight, assisting the heat-insulated pipe body 10 in maintaining a vertical state during the process of penetrating the oil well, assisting in the uprighting of the pipe body, and acting as a filter screen when the heat-insulated pipe body 10 contacts the oil in the oil well, filtering out impurities in the oil well, such as mechanical impurities, wax, mud, sand, asphalt, and colloids, etc., reducing the purity of the oil after entering the heat-insulated pipe body 10 and reducing the clogging problem of the heat-insulated pipe body 10;

[0036] The umbrella-shaped counterweight 20 includes a counterweight ball 201, a traction line 202, and a ring support 203. The counterweight ball 201 is rotatably connected to the inside of the ring support 203 via a support rod, and the traction line 202 is attached to the counterweight ball 201. The free end of the traction line 202 passes through the insulation pipe body 10 until it is exposed on the land surface, and is used to pull the counterweight ball 201. While changing the height of the counterweight ball 201, it also changes the shape of the folded net 204.

[0037] It also includes a folded mesh 204, which is a frustum-shaped structure with hollow upper and lower ends. One end of the folded mesh 204 is rotatably connected to the ring support 203, and the other end is rotatably connected to the heat-insulating pipe body 10. The folded mesh 204 is funnel-shaped, which expands the contact area with oil. The wider the contact area, the more convenient it is to filter or cut the colloidal material in the oil well.

[0038] In this embodiment, the folded net 204 is composed of several umbrella ribs 241. Each umbrella rib 241 is formed by connecting at least two or more rotating rods 241-1. One end of each umbrella rib 241 is rotatably connected to the ring support 203, and the other end is rotatably connected to the outer wall of the first end of the heat insulation pipe 10. When the counterweight ball 201 rises from the outside of the heat insulation pipe 10 to the inside of the heat insulation pipe 10, the folded net 204 can also change its shape synchronously to avoid the folded net 204 restricting the rise of the counterweight ball 201.

[0039] In this embodiment, the umbrella rib 241 connected to the outer wall of the first end of the insulation pipe 10 has a barb hanging on this end. 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. Even if the insulation pipe 10 touches the inner wall of the oil well, it will be separated by the umbrella rib 241, reducing the occurrence of damaged parts at the end of the insulation pipe 10.

[0040] In this embodiment, the cross-sectional shape of the umbrella rib 241 is triangular, and the triangular edge of the umbrella rib 241 always faces downward, which can more quickly cut the gelatinous material in the oil. When the gelatinous material cut into pieces is pumped to land by the oil pipeline, it will not easily block the pipeline, and the pressure applied by the pipeline during pumping is not as great.

[0041] In other embodiments, the umbrella rib 241 has a circular cross-sectional shape, which also has the ability to cut through the gum-like substances in 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 umbrella rib 241 is at least 3cm long, which is much longer than the oil well opening which is only about 10cm to 30cm. It can go deeper into the oil well, and the process of unfolding and closing will not affect the use of the insulation 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 steel, improve its strength and wear resistance. Adding chromium to chromium alloy steel can significantly improve its corrosion resistance. Chromium can react with oxygen to form a dense chromium oxide passivation film, which can effectively resist the erosion of various corrosive media, especially strong oxidizing media and high-temperature environments.

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

[0045] The sealing element 103 and the air-filled layer 104 are provided. The sealing element 103 is installed at one end of the heat-insulating pipe body 10 and is used 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 air-filled layer 104.

[0046] In the above technical solution, the insulation pipe body is double-layered inside and out. Even if the pipe collides with the inner wall of the oil well during the process of the pipe going deep into the bottom of the oil well, the surface of the oil pipe will be worn. The wear will cause scratches, dents, or even holes and cracks on the surface of the oil pipe, but it will not cause oil pipe leakage.

[0047] Secondly, the air-filled layer 104 between the first pipe body 101 and the second pipe body 102 is filled with inert gas, which plays a role in heat preservation. When the pipeline leaks, the inert gas will also be released into the air, forming a temporarily sealed gas layer in the narrow oil well passage, giving the staff time to react and replace the heat-insulating pipe body 10 in time.

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

[0049] Furthermore, the sealing element 103 is made of flame-retardant material. This flame-retardant material is a conventional material that has undergone special treatment or has had flame retardants added; it includes, but is not limited to, flame-retardant carbon fiber composite materials. Carbon fiber itself has high strength and modulus, but also a certain degree of flexibility. When subjected to external force, carbon fiber can undergo elastic deformation to a certain extent, and can return to its original shape after the external force disappears.

[0050] It is suitable for installation between two first pipe bodies 101 and second pipe bodies 102 to play a sealing role. Even if it is lost after being immersed in oil, the oil liquid can act as a gas sealing layer. The inert gas injected into the oil can also expel the oxygen in the oil, reduce the oxygen content, and reduce the risk of fire and explosion.

[0051] In summary, the insulated pipe body 10 of the present invention has the functions of heat preservation, damage prevention after impact, and uprighting function for disassembly and installation, and assists the insulated pipe body 10 to penetrate deeper into the oil well.

[0052] Example 2

[0053] The difference between this embodiment and embodiment 1 is that the structure of the folded mesh is different. The folded mesh 204 is a mesh structure formed by cross-welding of several flexible metal wires, which can deform under the action of external force and undergo corresponding deformation as the counterweight ball 201 rises and falls.

[0054] The effect achieved in this embodiment is the same as that in embodiment 1. Any structural names, connection relationships and effects not mentioned in this embodiment can be found in embodiment 1, and will not be elaborated here.

[0055] Example 3

[0056] A method for using a heat-insulated and wear-resistant tubing for oil wells, based on Example 1 or Example 2, includes the following steps:

[0057] Step 1, Oil Well Assessment: Collect geological data of the oil well, including information on formation structure, rock characteristics, pressure, temperature, etc., and select appropriate insulation pipe type, specifications and construction plan;

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

[0059] Step 3: Install the umbrella-shaped counterweight 20, connect several insulated pipe bodies 10, and use lifting equipment to slowly lower the connected insulated pipe bodies 10 into the well. During the lowering process, the counterweight ball 201 in the umbrella-shaped counterweight 20 will help maintain the verticality and stability of the insulated pipe body 10 due to gravity, avoiding collision and friction with the well wall. After lowering a certain length of insulated pipe body 10, it should be suspended and fixed to ensure that the position of the insulated pipe body 10 in the well is accurate and stable. At the same time, the lowering depth and number of insulated pipe bodies 10 should be recorded until the umbrella-shaped counterweight 20 contacts the oil.

[0060] Step 4: After the insulation pipe body 10 is lowered to the predetermined depth, raise the position of the counterweight ball 201 in the umbrella-shaped counterweight 20, and use the umbrella-shaped counterweight 20 as a filter and divider. Use packers and other tools to seal the annular space between the insulation pipe body 10 and the casing to prevent oil, gas, water and other media from flowing into the annulus. Perform final tightening and sealing treatment on the wellhead equipment to ensure the sealing and stability of the entire tubing system.

[0061] In step 4, if the seal 103 on the bottommost insulation pipe 10 is lost, it will not affect the normal operation of the insulation pipe 10. On the contrary, after the insulation pipe 10 comes into contact with oil, the oil can also act as a gas sealing layer. The inert gas injected 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 description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A heat-insulating and wear-resistant oil pipe for oil wells, characterized in that, It includes a number of insulated pipe bodies (10) and umbrella-shaped counterweights (20), wherein the first end of one of the insulated pipe bodies (10) is detachably and fixedly connected to the umbrella-shaped counterweights (20), and the tail end of this insulated pipe body (10) is connected to several insulated pipe bodies (10). The umbrella-shaped counterweight (20) includes a counterweight ball (201), a traction line (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 the traction line (202) is attached to the counterweight ball (201). The free end of the traction line (202) passes through the heat-insulating pipe body (10) until it is exposed on the land surface. It also includes a folded mesh (204), which is a frustum-shaped structure with hollow upper and lower ends. One end of the folded mesh (204) is rotatably connected to the ring support (203), and the other end is rotatably connected to the heat insulation pipe body (10).

2. The heat-insulating and wear-resistant oil pipe for oil wells as described in claim 1, characterized in that, The folded mesh (204) is a mesh structure formed by cross-welding of several flexible metal wires.

3. The heat-insulating and wear-resistant tubing for oil wells as described in claim 1, characterized in that, The folded net (204) is composed of several umbrella ribs (241), each umbrella rib (241) is connected by 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 first end of the heat-insulating pipe body (10).

4. The heat-insulating and wear-resistant oil pipe for oil wells as described in claim 3, characterized in that, The umbrella rib (241) connected to the outer wall of the first end of the insulated pipe body (10) has a barb hanging on this end.

5. The heat-insulating and wear-resistant oil pipe for oil wells as described in claim 3, characterized in that, The cross-sectional shape of the umbrella rib (241) is triangular, and the triangular edge of the umbrella rib (241) always faces downward.

6. The heat-insulating and wear-resistant oil pipe for oil wells as described in claim 3, characterized in that, The length of the umbrella rib (241) is at least 3 cm or more.

7. The heat-insulating and wear-resistant oil pipe for oil wells as described in claim 3, characterized in that, The umbrella ribs (241) are made of chromium alloy steel.

8. The heat-insulating and wear-resistant tubing for oil wells as described in claim 1, characterized in that, The heat-insulating pipe body (10) comprises a first pipe body (101) and a second pipe body (102) located in the first pipe body (101); A sealing element (103) and an air-filled layer (104) are provided. The sealing element (103) is installed at one end of the heat-insulating pipe body (10) and is used 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 air-filled layer (104).

9. The heat-insulating and wear-resistant tubing for oil wells as described in claim 8, characterized in that, The sealing element (103) is a hollow frustum shape, and the end face of the sealing element (103) is provided with protrusions at an inclined angle.

10. The heat-insulating and wear-resistant tubing for oil wells as described in claim 8, characterized in that, The seal (103) is made of flame-retardant material.

Images