175MPa fracturing manifold system

Abstract

The utility model discloses a 175MPa fracturing manifold system which comprises a high-low pressure manifold, a choked flow manifold and a shunt manifold which are sequentially arranged in the conveying direction of fracturing fluid to a wellhead. The high-low pressure manifold comprises a main channel high-pressure manifold and a low-pressure manifold, and a plurality of side channel plug valves are arranged on the two sides of the main channel high-pressure manifold at intervals; a high-pressure unloading valve is arranged at one end, close to a wellhead, of the main channel high-pressure manifold; each side channel plug valve is correspondingly connected with a pump discharge manifold; the shunt manifold comprises a main pipeline and two branch manifolds branched from the main pipeline, the two branch manifolds are both connected with a well mouth cleat cross, and one connector of the well mouth cleat cross is communicated with a well mouth; the flow blocking manifold is used for preventing fracturing fluid from flowing back to the main channel high-pressure manifold from the flow dividing manifold. According to the utility model, the stable conveying of ultrahigh pressure and large-displacement fracturing fluid with the working pressure not lower than 175MPa to a wellhead can be met, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of fracturing manifolds, and more specifically, to a 175MPa fracturing manifold system and a fluid control method thereof. Background Art

[0002] The fracturing manifold is an indispensable equipment in oilfield fracturing operations. As the depth of fracturing operations continues to increase, the manifold is subjected to higher and higher fracturing pressures. The currently commonly used 140MPa fracturing manifold system has problems such as insufficient pressure bearing capacity of the manifold body and complex structure. In addition, when the existing fracturing manifold is used to directly transport 175MPa ultra-high pressure fracturing fluid to the wellhead, a large impact force will be generated on the wellhead, which will cause a large vibration of the wellhead device, affecting the safety of personnel and equipment. Therefore, the existing fracturing manifold cannot meet the needs of ultra-deep wells, ultra-high pressure, and large-displacement fracturing operations. It is necessary to form a 175MPa fracturing manifold system that can complete the control of the convergence, distribution, transportation and overpressure discharge of ultra-high pressure fracturing fluids, and stably transport the fracturing fluid from the high-pressure pump to the wellhead. Utility Model Content

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described below.

[0004] In order to achieve these purposes and other advantages according to the utility model, a 175MPa fracturing manifold system is provided, including high- and low-pressure manifolds, a choke manifold and a shunt manifold arranged in sequence along the direction of conveying the fracturing fluid to the wellhead; the high- and low-pressure manifolds include a main channel high-pressure manifold and a low-pressure manifold, and a plurality of side channel plug valves are arranged at intervals on both sides of the main channel high-pressure manifold; a high-pressure unloading valve is arranged at one end of the main channel high-pressure manifold close to the wellhead; each of the side channel plug valves is respectively connected to a pump discharge manifold; the shunt manifold includes a main pipeline and two branch manifolds branched from the main pipeline, the two branch manifolds are connected to the wellhead horn four-way, and one of the interfaces of the wellhead horn four-way is connected to the wellhead; the two ends of the choke manifold are respectively connected to the main channel high-pressure manifold and the main pipeline, so as to prevent the fracturing fluid from the shunt manifold from flowing back to the main channel high-pressure manifold.

[0005] Preferably, the main channel high-pressure manifold is formed by sequentially splicing a plurality of straight pipes, and two adjacent straight pipes are connected via a flange cross-way, and two interfaces on the flange cross-way located on both sides of the straight pipes are respectively connected to the side channel stopcock.

[0006] Preferably, the pump discharge manifold is formed by a plurality of L-shaped short tubes spliced ​​in sequence, wherein two of the L-shaped short tubes are connected by a pipeline expansion device, the L-shaped short tube at the end is connected to the corresponding side channel stopcock through a rotating flange, and two adjacent L-shaped short tubes in the remaining L-shaped short tubes are rotationally connected.

[0007] Preferably, a manual gate valve and a hydraulic gate valve are sequentially arranged on the main pipe along the flow direction of the fracturing fluid.

[0008] Preferably, the choke manifold includes a choke line and a one-way valve arranged on the choke line.

[0009] Preferably, it also includes a throttling blowdown manifold, the throttling blowdown manifold includes a blowdown main line, one end of the blowdown main line is connected to one of the branch manifolds, and the other end is respectively connected to a first blowdown branch line and a second blowdown branch line through a blowdown tee, a first blowdown hydraulic stopcock and an adjustable flow valve are sequentially arranged on the first blowdown branch line along the blowdown direction of the fracturing fluid, and a second blowdown hydraulic stopcock and a fixed throttle nozzle are sequentially arranged on the second blowdown branch line along the blowdown direction of the fracturing fluid.

[0010] Preferably, it also includes a measuring device, which is arranged on the main channel high-pressure manifold, and the measuring device includes a pressure measuring device, a temperature measuring device, a flow measuring device, and a vibration measuring device, which are used to monitor the fracturing fluid pressure, temperature, flow rate in the main channel high-pressure manifold and the vibration of the main channel high-pressure manifold respectively.

[0011] Preferably, the main pipes of the high and low pressure manifolds and the branch manifold are both arranged on a base, and the bottom of the branch manifold and the choke manifold are provided with a support adjustment device, which is used to support and adjust the vertical position of the branch manifold and the choke manifold.

[0012] Preferably, the support and adjustment device comprises a support frame, a telescopic device, and a pressure sensor; the telescopic device is fixedly arranged on the support frame, the pressure sensor is installed on the movable end thereof, and is in contact with the branch manifold or the choke manifold.

[0013] The utility model at least has the following beneficial effects:

[0014] 1. In the 175MPa fracturing manifold system provided by the utility model, the fracturing fluid is converged into the main channel high-pressure manifold through the discharge manifolds of each pump and the plug valves of each side channel, enters the branch manifold after passing through the choke manifold, and is transported to the wellhead through two branch manifolds in the branch manifold. After the fracturing fluid is divided into two paths, the impact force on the wellhead can be effectively reduced, the vibration can be reduced, and the safety of personnel and equipment can be ensured; it can meet the stable transportation of ultra-high pressure and large-displacement fracturing fluid with a working pressure of not less than 175MPa from the high-pressure pump to the wellhead, and realize the convergence, distribution, choke and overpressure discharge of ultra-high pressure fracturing fluid.

[0015] 2. The 175MPa fracturing manifold system provided by the utility model adopts flange connection for the pump discharge manifold compared to the conventional union connection, and provides more degrees of freedom through the pipeline expansion device and the rotating flange, thus solving the problems of insufficient life of ultra-high pressure seals and inconvenient installation.

[0016] 3. The 175MPa fracturing manifold system provided by the utility model can adjust the release of the fracturing fluid with variable pressure and speed or fixed pressure and speed through the throttling release manifold.

[0017] 4. The 175MPa fracturing manifold system provided by the utility model can realize real-time monitoring of the working state of the fracturing fluid in the 175MPa fracturing manifold system through the measuring device, so as to detect abnormal situations in time.

[0018] 5. The 175MPa fracturing manifold system provided by the utility model provides a support adjustment device to solve the problem that the ground will sink under the action of the manifold vibration under soft foundation conditions, causing the pipelines and connections in the manifold to bear excessive bending loads. The relative displacement of the corresponding pipelines can be compensated through each support adjustment device to ensure the accurate connection of the corresponding pipelines and the stability during operation, thereby preventing the flange interface from being damaged due to overload caused by ground settlement.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the 175MPa fracturing manifold system of the utility model;

[0021] Figure 2 This is a structural schematic diagram of the high and low pressure manifold of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the pump discharge manifold of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the choke manifold of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the flow distribution manifold of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the throttling nozzle manifold of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the support and adjustment device of the utility model; DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] like Figures 1 to 7 As shown, the utility model provides a 175MPa fracturing manifold system, comprising a high- and low-pressure manifold 1, a flow-blocking manifold 3 and a flow-dividing manifold 4 arranged in sequence along the direction of conveying the fracturing fluid to the wellhead; the high- and low-pressure manifold 1 comprises a main channel high-pressure manifold 11 and a low-pressure manifold 12, and a plurality of side channel plug valves 13 are arranged at intervals on both sides of the main channel high-pressure manifold 11; a high-pressure unloading valve 9 is arranged at one end of the main channel high-pressure manifold 12 close to the wellhead; each of the side channel plug valves 13 is provided with a high-pressure unloading valve 9 ... 3 are respectively connected to the pump discharge manifold 2; the shunt manifold 4 includes a main pipeline 41 and two branch manifolds 45 branched from the main pipeline 41, and the two branch manifolds 45 are connected to the wellhead cleat 46, and one interface of the wellhead cleat 46 is connected to the wellhead; the two ends of the blocking manifold 3 are respectively connected to the main channel high-pressure manifold 11 and the main pipeline 41, so as to prevent the fracturing fluid from the shunt manifold 4 to flow back to the main channel high-pressure manifold 11.

[0030] In this technical solution, the fracturing fluid is pumped to each of the pump discharge manifolds 2 by a high-pressure pump, and then converges into the main channel high-pressure manifold 12 through each of the side channel plug valves 13; and then is transported to the wellhead through the two branch manifolds 45 of the blocking manifold 3 and the diversion manifold 4. After the fracturing fluid is divided into two paths, the impact force on the wellhead can be effectively reduced and the vibration can be reduced. In the above process, the control of the fracturing fluid input flow rate can be achieved by opening and closing each of the side channel plug valves 13; after the fracturing fluid is divided into two paths through the two branch manifolds 45, the impact force on the wellhead can be effectively reduced and the vibration can be reduced. The working pressure set by the high-pressure unloading valve 9 is the maximum working pressure of the fracturing manifold system. When the pressure in the main channel high-pressure manifold 12 is greater than the set working pressure, the high-pressure unloading valve 9 is opened, and the overpressure fracturing fluid flows out through the high-pressure unloading valve 9 until the pressure in the main channel high-pressure manifold 12 does not exceed the set working pressure, and the high-pressure unloading valve 9 is closed.

[0031] In another embodiment, if Figure 2 As shown, the main channel high-pressure manifold 12 is formed by sequentially splicing a plurality of straight pipes 122, and two adjacent straight pipes 122 are connected by a flange spool 121, and two interfaces on the flange spool 122 located on both sides of the straight pipes 122 are respectively connected to the side channel plug valves 13. Each side channel plug valve 13 forms a plurality of fracturing fluid inlet ports on both sides of the main channel high-pressure manifold 12, which can meet the requirements of fracturing fluid inlet of multiple channels.

[0032] In another embodiment, if Figure 3 As shown, the pump discharge manifold 2 is formed by splicing a plurality of L-shaped short tubes 21 in sequence, wherein two of the L-shaped short tubes 21 are connected by a pipeline expansion device 22, the L-shaped short tube 21 at the end is connected to the corresponding side channel plug valve 13 by a rotating flange 23, and the adjacent two L-shaped short tubes 21 in the remaining L-shaped short tubes 21 are rotationally connected. The pipeline expansion device 22 adopts the structure described in CN114198577B "A pipeline expansion device". The pipeline expansion device 22 can adjust the length of the pump discharge manifold 2 within a certain range, and the rotating flange 23 can provide multiple degrees of freedom, so that the spatial position of the pump discharge manifold 2 can be flexibly adjusted, which is convenient for connection, and solves the problem of inconvenient installation of the pump discharge manifold in the prior art. Compared with the conventional union connection, the flange connection solves the problem of insufficient sealing life under ultra-high pressure working conditions. The adjacent two L-shaped short tubes 21 are rotationally connected, and specifically, the conventionally used pipeline rotating connection joint 24 can be adopted to further increase the flexibility of the pump discharge manifold 2 during installation.

[0033] In another embodiment, if Figure 5As shown, a manual gate valve 42 and a hydraulic gate valve 43 are sequentially arranged on the main pipeline 41 along the flow direction of the fracturing fluid. The manual gate valve 41 and the hydraulic gate valve 43 are used to control the on-off of the main pipeline 41. The main pipeline 41 can be connected to the two branch manifolds 45 through a flange tee 44, and the fracturing fluid is distributed through the flange tee 44 to divide the fracturing fluid into two paths. The symmetrically distributed branch manifolds 45 can reduce the impact force of the fracturing fluid on the wellhead 6 and reduce vibration.

[0034] In another embodiment, if Figure 4 As shown, the choke manifold 3 includes a choke line 31 and a one-way valve 32 arranged on the choke line 31. One end of the choke line 31 is connected to the main channel high-pressure manifold 12, and the other end is connected to the main pipeline 41. The one-way valve 32 only allows the fracturing fluid to be transported from the main channel high-pressure manifold 12 to the shunt manifold 4. It can also prevent the fracturing fluid at the bottom of the well from passing through the shunt manifold 4 and the high-low pressure manifold 1, causing a reverse impact on the high-pressure pump, so as to protect the high-pressure pump.

[0035] In another embodiment, if Figure 6 As shown, the throttling discharge nozzle manifold 7 is also included, and the throttling discharge nozzle manifold 7 includes a discharge main line 71, one end of the discharge main line 71 is connected to one of the branch manifolds 45, and the other end is respectively connected to a first discharge branch line and a second discharge branch line through a discharge tee 72. The first discharge branch line is provided with a first discharge hydraulic actuated cock valve 73 and an adjustable flow valve 74 in sequence along the discharge flow direction of the fracturing fluid, and the second discharge branch line is provided with a second discharge hydraulic actuated cock valve 76 and a fixed throttle nozzle 75 in sequence along the discharge flow direction of the fracturing fluid. The adjustable flow valve 74 can adjust the flow area of ​​the fracturing fluid, and adjust the variable pressure and speed of the fracturing fluid discharged through the first discharge hydraulic actuated cock valve 73. The aperture of the fixed throttle nozzle 75 is smaller than the aperture of the outlet end of the second hydraulic discharge plug valve 76. The fixed throttle nozzle 75 can adjust the fixed pressure and speed of the fracturing fluid passing through the second hydraulic discharge plug valve 76. A ball throwing manifold 5 can also be set on the other branch manifold 45. By setting a ball thrower on the pipeline and connecting the pipeline to the branch manifold 45, a temporary plugging ball can be transported to the wellhead through the branch manifold 4. The throttling discharge nozzle manifold 7 and the ball throwing manifold 5 can be connected to the corresponding branch manifold 45 through a multi-port 47.

[0036] In another embodiment, the 175MPa fracturing manifold system further includes a measuring device 10, which is arranged on the main channel high-pressure manifold 12. The measuring device 10 includes a pressure measuring device, a temperature measuring device, a flow measuring device, and a vibration measuring device, which are respectively used to monitor the fracturing fluid pressure, temperature, flow rate and vibration of the main channel high-pressure manifold 12. The pressure measuring device, the temperature measuring device, the flow measuring device and the vibration measuring device can be monitored by corresponding sensor devices respectively; the 175MPa fracturing manifold system can be monitored in real time through the measuring device 10; the staff can make timely adjustments according to the fracturing fluid pressure, temperature, flow rate or vibration abnormality of the main channel high-pressure manifold 12 monitored by the measuring device 10.

[0037] In another embodiment, the main lines 41 of the high- and low-pressure manifolds 1 and the shunt manifolds 4 are both arranged on a base, and the bottoms of the branch manifolds 45 and the choke manifolds 3 are provided with support adjustment devices 8, and the support adjustment devices 8 are used to support and adjust the vertical positions of the branch manifolds 45 and the choke manifolds 3. Each of the support adjustment devices 8 is used to support the suspended branch manifolds 45 and the choke manifolds 3. And considering that for soft foundations, under the action of the manifold vibration, the ground will sink, causing each pipeline and interface in the manifold to bear excessive bending loads, which is not conducive to on-site construction safety, the relative displacement of the corresponding pipelines is compensated by each of the support adjustment devices 8, ensuring the precise connection of the branch manifolds 45 and the choke manifold 3 and the stability during operation, and preventing the flange interface from being damaged due to overload caused by ground settlement.

[0038] Specifically, Figure 7 As shown, the support and adjustment device 8 includes a support frame 81, a telescopic device 82, and a pressure sensor; the telescopic device 82 is fixedly arranged on the support frame 81, and the pressure sensor is installed on its movable end, and is in contact with the branch manifold 45 or the choke manifold 3; preferably, the support and adjustment device 8 is arranged at the pipeline connection between the branch manifold 45 and the choke manifold 3, such as a flange connection point or each connection multi-way place; refer to Figure 1In this embodiment, the support and adjustment device 8 is provided at five locations, which are respectively provided below the four multi-passes 46 close to the ground on the branch manifold 45 and below the flange connection point between the choke manifold 3 and the main channel high-pressure manifold 12. The load-bearing capacity of the support and adjustment device 8 is designed according to the weight of the multi-passes and pipelines connected in the manifold. The telescopic device 82 can select a conventional hydraulic or electric telescopic device. In this embodiment, the telescopic device 82 selects a servo motor as the main drive and a telescopic push cylinder as an actuator, and each component meets the explosion-proof and protection level requirements of the well site. The pressure sensor is provided between the movable end of the telescopic device 82 and the pipeline connection. In actual use, the pressure sensor can be provided at the bottom of the connecting base 83, and the connecting base 83 is provided at the bottom of the corresponding pipeline connection, so that each telescopic device 82 can be lifted upward more stably. When the fracturing manifold system is installed for the first time, each of the support and adjustment devices 8 can be manually controlled separately, so that the corresponding branch manifold 45 and the choke manifold 3 can be accurately installed. Then, the pressure sensors of the support and adjustment devices 8 are used to monitor the pressure. When the pressure sensor detects that the pressure data exceeds the set value, the corresponding telescopic device 82 is used to lift and compensate for the displacement.

[0039] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A 175MPa fracturing manifold system, characterized in that: It comprises high- and low-pressure manifolds, a choke manifold and a shunt manifold which are sequentially arranged along the direction of conveying the fracturing fluid to the wellhead; the high- and low-pressure manifolds comprise a main channel high-pressure manifold and a low-pressure manifold, and a plurality of side channel plug valves are arranged at intervals on both sides of the main channel high-pressure manifold; a high-pressure unloading valve is arranged at one end of the main channel high-pressure manifold close to the wellhead; each of the side channel plug valves is respectively connected to a pump discharge manifold; the shunt manifold comprises a main pipeline and two branch manifolds branched from the main pipeline, both of the two branch manifolds are connected to the wellhead clevis, and one of the interfaces of the wellhead clevis is connected to the wellhead; the two ends of the choke manifold are respectively connected to the main channel high-pressure manifold and the main pipeline, so as to prevent the fracturing fluid from flowing back from the shunt manifold to the main channel high-pressure manifold.

2. The 175MPa fracturing manifold system according to claim 1, characterized in that: The main channel high-pressure manifold is formed by splicing a plurality of straight pipes in sequence, and two adjacent straight pipes are connected via a flange cross-way, and two interfaces on the flange cross-way located on both sides of the straight pipes are respectively connected to the side channel stopcock.

3. The 175MPa fracturing manifold system according to claim 1, characterized in that: The pump discharge manifold is formed by splicing a plurality of L-shaped short tubes in sequence, wherein two of the L-shaped short tubes are connected by a pipeline expansion device, the L-shaped short tube at the end is connected to the corresponding side channel stopcock through a rotating flange, and two adjacent L-shaped short tubes in the remaining L-shaped short tubes are rotationally connected.

4. The 175MPa fracturing manifold system according to claim 1, characterized in that: The main pipe is provided with a manual gate valve and a hydraulic gate valve in sequence along the flow direction of the fracturing fluid.

5. The 175MPa fracturing manifold system according to claim 1, characterized in that: The choke manifold includes a choke line and a one-way valve arranged on the choke line.

6. The 175MPa fracturing manifold system according to claim 1, characterized in that: It also includes a throttling blowdown manifold, which includes a discharge main line, one end of which is connected to one of the branch manifolds, and the other end is respectively connected to a first discharge branch line and a second discharge branch line through a discharge tee, a first blowdown hydraulic plug valve and an adjustable flow valve are sequentially arranged on the first discharge branch line along the blowdown direction of the fracturing fluid, and a second blowdown hydraulic plug valve and a fixed throttle nozzle are sequentially arranged on the second discharge branch line along the blowdown direction of the fracturing fluid.

7. The 175MPa fracturing manifold system according to claim 1, characterized in that: It also includes a measuring device, which is arranged on the main channel high-pressure manifold. The measuring device includes a pressure measuring device, a temperature measuring device, a flow measuring device, and a vibration measuring device, which are used to monitor the fracturing fluid pressure, temperature, flow in the main channel high-pressure manifold and the vibration of the main channel high-pressure manifold.

8. The 175MPa fracturing manifold system according to claim 1, characterized in that: The high and low pressure manifolds and the main pipeline are both arranged on a base, and the bottoms of the branch manifolds and the choke manifolds are provided with support and adjustment devices for supporting and adjusting the vertical positions of the branch manifolds and the choke manifolds.

9. The 175MPa fracturing manifold system according to claim 8, characterized in that: The support adjustment device includes a support frame, a telescopic device, and a pressure sensor; the telescopic device is fixedly arranged on the support frame, and the pressure sensor is installed on its movable end, and is in contact with the branch manifold or the choke manifold.

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