Fracturing pipeline and pipe column heating device

Abstract

The utility model discloses a fracturing pipeline and pipe column heating device which comprises a tank car and a boiler car, the tank car and the boiler car are connected through a first pipeline, one side, far away from the boiler car, of the tank car is provided with a well mouth flow path through a second pipeline in a connected mode, and one side, far away from the tank car, of the well mouth flow path is provided with a fracturing truck through a third pipeline in a connected mode. A fourth pipeline is arranged on the side, away from the tank car, of the boiler car and penetrates through the third pipeline. A fracturing pipe column is arranged at the wellhead flow path, the fracturing pipe column extends into a well, and a circulating pipeline is arranged on the inner side of the fracturing pipe column; according to the device, continuous heating treatment is achieved on the fracturing pipeline and the fracturing pipe column through circulation of high-temperature liquid, a high-temperature environment is formed at the fracturing pipeline and the fracturing pipe column, heating and heat preservation treatment on fracturing liquid in a well is effectively achieved, the sand suspending performance of a liquid system is improved, the fracturing sand blocking rate is reduced, and effective implementation of fracturing construction in winter is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fracturing and heat preservation, in particular to a fracturing pipeline and pipe column heating device. Background Art

[0002] In the process of oil and gas field development, fracturing plays an important role in increasing production and injection of oil and gas field development. It is widely used in the development of low permeability oil and gas reservoirs and unconventional energy. The performance of the fracturing fluid system is a key factor affecting the effect of fracturing operations. The cross-linked guar gum fracturing fluid belongs to the category of gel. Due to the chemical covalent bond and the physical hydrogen bond molecular action, a three-dimensional system structure is formed. According to theoretical findings, the existence mode and structure of the system determine the viscoelasticity, shear resistance, viscosity increase, suspension, thixotropy, temperature resistance and other properties of the fluid, and these properties have a certain influence on the sand carrying capacity of the fluid. Studies have shown that the pH value of the solution has the greatest influence on the delayed cross-linking effect of the organic boron fracturing fluid, followed by temperature, and the concentration of the cross-linking agent has the least influence, that is, the primary and secondary influences are: (primary) pH value → temperature → cross-linking agent concentration (secondary). The cross-linking mechanism of organic boron is firstly the multi-stage ionization of the organic boron complex, and then the generated borate ions react with the cis-adjacent hydroxyl groups on the plant gum molecular chain to form a three-dimensional mesh gel. The higher the temperature, the faster the molecular movement, which increases the ionization of the complex and the hydroxyl group on the plant gum molecular chain. Therefore, the higher the temperature, the faster the cross-linking reaction and the shorter the delayed cross-linking time. On the contrary, the lower the temperature, the longer the cross-linking time. How to ensure that winter fracturing construction is not affected by the ambient temperature has become the primary problem of winter fracturing construction.

[0003] Patent CN218030165U discloses an electromagnetic heating device suitable for heavy oil, including an electromagnetic heating device body and a limit assembly, a limit shell is arranged at the lower left side of the electromagnetic heating device body, the limit assembly is arranged above the rotating disc, and a limit plate is arranged above the telescopic rod. The electromagnetic heating device suitable for heavy oil is provided by a rotating disc, a limit assembly, a buffer pad, a fixing buckle and a handle. However, the insulation technology focuses on the research of ground insulation. Commonly used methods include insulation tanks, spray insulation materials, ground insulation tents, insulation material winding, electric heating wires, etc., which lack heating of underground fracturing pipe strings, cannot ensure that the fracturing fluid maintains a high temperature when entering the formation from the wellhead, and cannot effectively improve the performance indicators of the liquid system. Utility Model Content

[0004] The utility model aims to provide a fracturing pipeline and pipe column heating device, aiming to improve the problem that the existing technology relies on insulation tanks, spray insulation materials, ground insulation tents, insulation material winding, electric heating wires and other methods and cannot ensure that the fracturing fluid maintains a high temperature when entering the formation from the wellhead.

[0005] The utility model is implemented as follows: a fracturing pipeline and pipe column heating device, including a tank car and a boiler car, the tank car and the boiler car are connected through a first pipeline, a wellhead process is arranged on the side of the tank car away from the boiler car through a second pipeline, a fracturing vehicle is arranged on the side of the wellhead process away from the tank car through a third pipeline, and a fourth pipeline is arranged on the side of the boiler car away from the tank car, and the fourth pipeline is connected to the third pipeline; a fracturing pipe column is arranged at the wellhead process, the fracturing pipe column extends into the well, and a circulation pipe is arranged inside the fracturing pipe column, and the circulation pipe is connected to the second pipeline and the third pipeline.

[0006] Preferably, the third pipeline is configured as a fracturing manifold, and a blowdown manifold is connected to the side of the second pipeline, and the blowdown manifold is connected to the return tank; the fourth pipeline divides the third pipeline into inner and outer spaces, the inner space circulates high-temperature liquid, and the outer space circulates fracturing fluid.

[0007] Preferably, the circulation pipeline can be set as a U-shaped structure, the bottom of the circulation pipeline is set close to the bottom of the fracturing string, and the upper end protrudes from the upper end of the fracturing string, and a solenoid valve is arranged on the circulation pipeline.

[0008] Preferably, the circulation pipeline can be configured as an outer tube and an inner tube, the outer tube is configured as a cylindrical structure with the opening facing upward, a sealing cover is provided at the upper end of the outer tube, both ends of the inner tube are configured as openings, and the lower end is configured near the bottom of the outer tube, while the upper end protrudes from the outer tube.

[0009] Preferably, a plurality of limiting plates are arranged on the inner side of the outer tube, the plurality of limiting plates are divided into a plurality of groups, the plurality of groups of limiting plates are distributed along the height direction of the outer tube, and the ends of the limiting plates are in sliding contact with the inner tube.

[0010] Preferably, an annular groove is provided at the lower end of the sealing cover, a first thread is provided on the side wall of the annular groove, a second thread is provided at the upper end of the outer tube, and the sealing cover is threadedly sleeved on the outer tube.

[0011] Preferably, the sealing cover is provided with a circulation cavity, an output pipe is provided above the sealing cover, the output pipe is communicated with the circulation cavity, and solenoid valves are provided at the upper ends of the output pipe and the inner pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are: through the circulation of high-temperature liquid, continuous heating treatment of the fracturing pipeline and the fracturing string is achieved, and a high-temperature environment is formed at the fracturing pipeline and the fracturing string, effectively achieving heating and heat preservation treatment of the fracturing fluid in the well, improving the sand suspension performance of the liquid system, reducing the fracturing sand blockage rate, and ensuring the effective implementation of winter fracturing construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an embodiment of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the first plane of the fracturing string and the circulation pipeline in the embodiment of the utility model;

[0015] Figure 3 This utility model Figure 2 Schematic diagram of the three-dimensional structure of the intermediate circulation pipeline;

[0016] Figure 4 This utility model Figure 2 A three-dimensional structural diagram of the inner and outer tubes and the sealing cover;

[0017] Figure 5 It is a structural schematic diagram of the second plane of the fracturing pipe string and the circulation pipeline of the utility model.

[0018] In the figure: 1, fracturing string; 2, circulation pipeline; 3, outer pipe; 31, restriction plate; 4, inner pipe; 5, sealing cover; 51, output pipe; 52, flow chamber. DETAILED DESCRIPTION

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0021] Example 1

[0022] like Figure 1 , Figure 5As shown, a fracturing pipeline and pipe column heating device includes a tank truck, a boiler truck, a wellhead process and a fracturing truck. The tank truck and the boiler truck are connected through a first pipeline, the tank truck and the wellhead process are connected through a second pipeline, and the wellhead process is connected to the fracturing truck through a third pipeline. The third pipeline is set as a fracturing manifold to facilitate the circulation of fracturing fluid. A fourth pipeline is set on the side of the boiler truck away from the tank truck. The fourth pipeline seals the fourth pipeline and separates the third pipeline to form an inner and outer space. The inner space circulates high-temperature liquid and the outer space circulates fracturing fluid. A discharge pipe manifold is connected to the side of the second pipeline, and the discharge pipe manifold is connected to the return tank. A fracturing pipe column 1 is set at the wellhead process, and the fracturing pipe column 1 extends into the well, and the fracturing pipe column 1 is connected to the fracturing manifold. A circulation pipe 2 is set inside the fracturing pipe column 1, and the circulation pipe 2 is connected to the second pipeline and the fourth pipeline, thereby forming a channel for the circulation of high-temperature liquid. When the device is used to heat the fracturing fluid, the tank truck works to heat and pressurize the liquid to form a high-temperature liquid. The high-temperature liquid flows into the boiler truck and moves along the fourth pipeline to the circulation pipeline 2. The high-temperature liquid heats the fracturing fluid in the fracturing manifold during the circulation of the fourth pipeline, and at the same time, the fracturing fluid in the fracturing pipe string 1 is heated to form a high-temperature environment. The high-temperature liquid output from the circulation pipeline 2 flows back to the tank truck along the second pipeline to achieve the circulation heating of the high-temperature liquid and the insulation treatment of the fracturing fluid, which changes the existing insulation measures that cannot effectively maintain the temperature of the fracturing fluid flowing into the wellbore, improves the sand suspension performance of the liquid system, reduces the fracturing sand blockage rate, and ensures the effective implementation of winter fracturing construction.

[0023] like Figure 5 As shown, in order to achieve heating treatment of the downhole fracturing fluid, the circulation pipeline 2 can be set to a U-shaped structure, the bottom of the circulation pipeline 2 is set close to the bottom of the fracturing string 1, and the upper end protrudes from the upper end of the fracturing string 1. A solenoid valve is set on the circulation pipeline 2. Therefore, the high-temperature liquid can flow in the fracturing string 1 in a U-shaped structure, providing support for the circulation of the high-temperature liquid, and effectively increasing the temperature of the wellbore fracturing fluid.

[0024] Example 2

[0025] like Figure 1 , Figure 5As shown, a fracturing pipeline and pipe column heating device includes a tank truck, a boiler truck, a wellhead process and a fracturing truck. The tank truck and the boiler truck are connected through a first pipeline, the tank truck and the wellhead process are connected through a second pipeline, and the wellhead process is connected to the fracturing truck through a third pipeline. The third pipeline is set as a fracturing manifold to facilitate the circulation of fracturing fluid. A fourth pipeline is set on the side of the boiler truck away from the tank truck. The fourth pipeline seals the fourth pipeline and separates the third pipeline to form an inner and outer space. The inner space circulates high-temperature liquid and the outer space circulates fracturing fluid. A discharge pipe manifold is connected to the side of the second pipeline, and the discharge pipe manifold is connected to the return tank. A fracturing pipe column 1 is set at the wellhead process, and the fracturing pipe column 1 extends into the well, and the fracturing pipe column 1 is connected to the fracturing manifold. A circulation pipe 2 is set inside the fracturing pipe column 1, and the circulation pipe 2 is connected to the second pipeline and the fourth pipeline, thereby forming a channel for the circulation of high-temperature liquid. When the device is used to heat the fracturing fluid, the tank truck works to heat and pressurize the liquid to form a high-temperature liquid. The high-temperature liquid flows into the boiler truck and moves along the fourth pipeline to the circulation pipeline 2. The high-temperature liquid heats the fracturing fluid in the fracturing manifold during the circulation of the fourth pipeline, and at the same time, the fracturing fluid in the fracturing pipe string 1 is heated to form a high-temperature environment. The high-temperature liquid output from the circulation pipeline 2 flows back to the tank truck along the second pipeline to achieve the circulation heating of the high-temperature liquid and the insulation treatment of the fracturing fluid, which changes the existing insulation measures that cannot effectively maintain the temperature of the fracturing fluid flowing into the wellbore, improves the sand suspension performance of the liquid system, reduces the fracturing sand blockage rate, and ensures the effective implementation of winter fracturing construction.

[0026] like Figure 2 , Figure 3 As shown, in order to achieve the heating treatment of the downhole fracturing fluid, the circulation pipeline 2 can be set as an outer tube 3 and an inner tube 4, the outer tube 3 is set as a cylindrical structure with an opening facing upward, and a sealing cover 5 is set at the upper end of the outer tube 3 protruding from the fracturing string 1, and both ends of the inner tube 4 are set as openings, and the lower end is set near the bottom of the outer tube 3, and the upper end passes through the sealing cover 5 and protrudes from the outer tube 3. The high-temperature liquid flowing out of the fourth pipeline flows into the inner tube 4, and is output from the lower end of the inner tube 4 and accumulated in the outer tube 3. With the accumulation of the high-temperature liquid in the outer tube 3, the liquid level gradually rises, and finally, the high-temperature liquid is output from the sealing cover 5 and circulated into the second pipeline, or the high-temperature liquid flowing out of the fourth pipeline flows into the outer tube 3 through the sealing cover 5, and is input into the inner tube 4 from the lower end of the inner tube 4. With the accumulation of the high-temperature liquid in the inner tube 4, the liquid level gradually rises, and finally, the high-temperature liquid is output from the upper end of the inner tube 4 and circulated into the second pipeline.

[0027] like Figure 3As shown, in order to keep the inner tube 4 and the outer tube 3 relatively stably placed, a plurality of limiting plates 31 are further provided on the inner side of the outer tube 3. The plurality of limiting plates 31 are evenly divided into a plurality of groups. Each group of limiting plates 31 is located between the inner tube 4 and the outer tube 3 and is evenly distributed along the circumferential direction of the tube body. The plurality of limiting plates 31 are distributed along the height direction of the outer tube 3. The ends of the limiting plates 31 are in sliding contact with the inner tube 4. Through the cooperation of the limiting plates 31, the inner tube 4 is limited to be stably located at a certain position, thereby avoiding changes in the gap size between the inner tube 4 and the outer tube 3 due to external forces.

[0028] like Figure 4 As shown, in order to realize the rapid disassembly and assembly of the sealing cover 5, an annular groove is provided at the lower end of the sealing cover 5, a first thread is provided on the side wall of the annular groove, a second thread is provided at the upper end of the outer tube 3, the sealing cover 5 is threadedly sleeved on the outer tube 3, and the sealing cover 5 is stably and sealedly connected with the inner tube 4. The sealing cover 5 is provided with a circulation cavity 52, an output pipe 51 is provided above the sealing cover 5, the output pipe 51 is communicated with the circulation cavity 52, and solenoid valves are provided at the upper ends of the output pipe 51 and the inner tube 4. Since the output pipe 51 is communicated with the circulation cavity 52, and the output pipe 51 is sleeved on the outer tube 3, the output pipe 51 is communicated with the gap space formed by the outer tube 3 and the inner tube 4, which provides convenience for high-temperature liquid to enter and exit the outer tube 3.

[0029] The above are only 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 be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fracturing pipeline and pipe column heating device, characterized in that: The invention comprises a tank truck and a boiler truck, wherein the tank truck and the boiler truck are connected via a first pipeline, a wellhead process is arranged on the side of the tank truck away from the boiler truck via a second pipeline, a fracturing truck is arranged on the side of the wellhead process away from the tank truck via a third pipeline, and a fourth pipeline is arranged on the side of the boiler truck away from the tank truck, the fourth pipeline runs through the third pipeline; a fracturing pipe string (1) is arranged at the wellhead process, the fracturing pipe string (1) extends into the well, and a circulation pipe (2) is arranged inside the fracturing pipe string (1), the circulation pipe (2) is connected to the second pipe and the fourth pipe.

2. A fracturing pipeline and pipe column heating device according to claim 1, characterized in that: The third pipeline is configured as a fracturing manifold, which is connected to a blowdown manifold on the side of the second pipeline, and the blowdown manifold is connected to a flowback tank; the fourth pipeline separates the third pipeline into two inner and outer spaces, wherein the inner space flows high-temperature liquid, and the outer space flows fracturing fluid.

3. A fracturing pipeline and pipe column heating device according to claim 1, characterized in that: The circulation pipeline (2) can be configured as a U-shaped structure, the bottom of the circulation pipeline (2) is disposed adjacent to the bottom of the fracturing pipe string (1), and the upper end protrudes from the upper end of the fracturing pipe string (1), and a solenoid valve is disposed on the circulation pipeline (2).

4. A fracturing pipeline and pipe column heating device according to claim 1, characterized in that: The circulation pipeline (2) can be configured as an outer tube (3) and an inner tube (4); the outer tube (3) is configured as a cylindrical structure with an opening facing upward; a sealing cover (5) is provided at the upper end of the outer tube (3); both ends of the inner tube (4) are configured as openings, and the lower end is provided near the bottom of the outer tube (3), while the upper end protrudes from the outer tube (3).

5. A fracturing pipeline and pipe column heating device according to claim 4, characterized in that: A plurality of limiting plates (31) are also provided on the inner side of the outer tube (3), and the plurality of limiting plates (31) are evenly divided into a plurality of groups. The plurality of groups of limiting plates (31) are distributed along the height direction of the outer tube (3), and the ends of the limiting plates (31) are in sliding contact with the inner tube (4).

6. A fracturing pipeline and pipe column heating device according to claim 5, characterized in that: The lower end of the sealing cover (5) is provided with an annular groove, the side wall of the annular groove is provided with a first thread, the upper end of the outer tube (3) is provided with a second thread, and the sealing cover (5) is threadedly sleeved on the outer tube (3).

7. A fracturing pipeline and pipe column heating device according to claim 6, characterized in that: The sealing cover (5) is provided with a circulation cavity (52), an output pipe (51) is provided above the sealing cover (5), the output pipe (51) is communicated with the circulation cavity (52), and electromagnetic valves are provided at the upper ends of the output pipe (51) and the inner pipe (4).

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