Suction manifold structure of fracturing pump

Abstract

The utility model relates to the technical field of oil and gas field fracturing equipment, in particular to a fracturing pump suction manifold structure, which comprises U-shaped shunt pipes, U-shaped opening ends of the U-shaped shunt pipes are converged to form an inlet end, arc ends of the U-shaped shunt pipes are far ends, two branch pipes of the U-shaped shunt pipes are communicated through a connecting pipe, a plurality of groups of discharge pipes are sequentially arranged on one branch pipe, and the discharge pipes are communicated with the U-shaped shunt pipes. And the connecting pipe is arranged at the middle section or behind the middle section of the U-shaped shunt pipe. During use, fracturing fluid shunted by the branch pipes forms two paths, and is gathered at the connecting pipes and the arc ends to generate a hedging effect, so that a certain scouring effect on deposited mortar can be achieved, and the technical problem that sand accumulation and sand blockage are easy to occur in an existing suction shunting manifold structure can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field fracturing equipment, and particularly relates to a fracturing pump suction manifold structure. Background Art

[0002] A fracturing truck is a special vehicle used to inject high-pressure and large-displacement fracturing fluid into a well to fracture the formation and squeeze proppants into the fractures. The fracturing truck is provided with equipment such as a diesel engine, a hydraulic transmission, a radiator, a drive shaft guard, and a fracturing pump. Among them, the fracturing pump usually adopts a plunger pump, and during the fracturing process, a fluid containing various solid proppants with a large sand ratio is transported to the bottom of the well through the plunger pump; and the suction manifold serves as the supply channel for the liquid required when the plunger pump works, mainly playing a role in shunting, shunting the fracturing fluid pumped from a distance from multiple discharge steel pipes to the liquid cylinders. The liquid cylinders of the fracturing pump are usually three-cylinder or five-cylinder.

[0003] The Chinese invention patent with the publication number of CN111219326A discloses a manifold system with low-pressure suction and high-pressure discharge, including a low-pressure manifold, a high-pressure manifold, and a plunger pump. Among them, the plunger pump is a five-cylinder structure, and the low-pressure manifold inputs the medium at the hydraulic end of the plunger pump, adopting the U-shaped pipe double-suction method to supply a large amount of liquid to the five-cylinder plunger pump to solve the problem of air suction caused by insufficient liquid supply of the low-pressure shunt pipe. However, although the above-mentioned existing U-shaped pipe double-suction method can increase the liquid supply, when shunting each cylinder, it still follows the front-to-back method, so that the liquid pressure and flow rate inhaled by the fourth and fifth cylinders at the distal end gradually decrease, resulting in the problem that the most distal end of the suction manifold is more likely to accumulate sand and block sand due to insufficient flow rate. Content of the Utility Model

[0004] The utility model provides a fracturing pump suction manifold structure, which can solve the technical problem that the existing suction manifold structure is prone to sand accumulation and sand blockage.

[0005] The present application provides the following technical solutions:

[0006] A fracturing pump suction manifold structure includes a U-shaped shunt pipe. The U-shaped open ends of the U-shaped shunt pipe converge to form an inlet end, the arc ends of the U-shaped shunt pipe become the distal ends, the two branch pipes of the U-shaped shunt pipe are connected through a connecting pipe, and multiple groups of discharge pipes are sequentially arranged on one branch pipe. The connecting pipe is arranged in the middle section or after the middle section of the U-shaped shunt pipe.

[0007] Working process: After the fracturing fluid enters from the inlet end of the U-shaped shunt pipe, it is divided into two paths by the two branch pipes, and converges and communicates through the connecting pipe and the arc end at the distal end, and is shunted into multiple groups of discharge pipes, and is sent to the corresponding cylinder body of the plunger pump by the discharge pipes, and then is output by the plunger pump in a high-pressure form.

[0008] Advantageous Effects:

[0009] 1. Reduce sand particle deposition and blockage: The fracturing fluid after being shunted by the branch pipes forms two paths and converges at the connecting pipe and the arc end to generate a counter-flushing effect, which can play a certain role in flushing the deposited mortar, thereby reducing the problems of sand accumulation and blockage; in addition, the distal end of the shunt pipe is of a circular arc structure, and the characteristics of this structure can further reduce the problem of sand deposition at the distal end.

[0010] 2. Facilitate improving the shunt uniformity: After the fracturing fluid is shunted, the discharge pipe far from the inlet end can obtain sufficient liquid supply through another branch pipe. Compared with the existing method of supplying liquid to the sequentially arranged discharge pipes through a single main collecting pipe, this application can improve the shunt uniformity, reduce pressure fluctuations, make the suction flow rate and pressure of each cylinder of the plunger pump more balanced, and improve the service life of the plunger pump.

[0011] Further, there are five groups of discharge pipes, which are the first discharge pipe, the second discharge pipe, the third discharge pipe, the fourth discharge pipe, and the fifth discharge pipe from left to right in sequence. The outlet ends of the five groups of discharge pipes are connected by a connecting plate. The connecting plate is horizontally arranged, the U-shaped shunt pipe is inclined, and the arc end of the U-shaped shunt pipe is higher than the inlet end.

[0012] Beneficial effects: The horizontal setting of the connecting plate is beneficial to connecting with the input end of the plunger pump. The shunt pipe is inclined and the inlet end is lower, which is beneficial for the deposited sand particles to move towards the inlet end under the action of gravity. And the liquid flow rate and pressure at the inlet end are relatively large, which has a greater flushing effect on the deposited sand particles and is not easy to cause blockage. Compared with the horizontal setting, it can reduce the problem of a large amount of sand deposition at the distal end (the liquid flow rate and pressure at the distal end gradually decrease, which is easy to cause sand particle settlement and accumulation), resulting in insufficient suction.

[0013] Further, the included angle between the axis of the branch pipe and the horizontal plane is 2 - 5°.

[0014] Beneficial effects: If the inclination angle of the branch pipe is too large, it will increase the suction load of the plunger pump and may cause sand blockage at the inlet end. If the inclination angle is too small, the effect of dealing with sand deposition at the distal end is not obvious.

[0015] Further, the arc end of the U-shaped shunt pipe is detachably connected to the two branch pipes.

[0016] Beneficial effects: It is beneficial to disassemble the arc end later to clean the mortar deposited on the pipe wall.

[0017] Further, the arc end and the two branch pipes are connected by a clamp.

[0018] Beneficial effects: The clamp connection method is simple and convenient for disassembly and assembly.

[0019] Further, the two branch pipes are respectively an upper branch pipe and a lower branch pipe, and the inlet end of the upper branch pipe is communicated with the lower branch pipe through an arc pipe.

[0020] Beneficial effects: It is beneficial to reduce the pressure fluctuation during shunt and reduce the pressure loss.

[0021] Furthermore, a first sand-scooping pipe and a second sand-scooping pipe are arranged on the upper branch pipe. The first sand-scooping pipe is located between the second discharge pipe and the third discharge pipe, and the second sand-scooping pipe is located between the fourth discharge pipe and the fifth discharge pipe.

[0022] Beneficial effects: It is beneficial to carry out the cleaning operation on each section of the upper branch pipe.

[0023] Furthermore, the connecting pipe is located between the third discharge pipe and the fourth discharge pipe.

[0024] Beneficial effects: It is beneficial to balance the shunt.

[0025] Furthermore, a third sand-scooping pipe is arranged on the lower branch pipe, and the third sand-scooping pipe is located at the rear end of the connecting pipe.

[0026] Beneficial effects: It is beneficial to clean each section of the lower branch pipe.

[0027] Furthermore, the first sand-scooping pipe, the second sand-scooping pipe, and the third sand-scooping pipe are closed by plug caps.

[0028] Beneficial effects: When the shunt pipe needs to be cleaned, the plug caps can be opened to insert the cleaning tool, and the operation is simple. Description of the Drawings

[0029] Figure 1 is the front view of the U-shaped shunt pipe of the present utility model;

[0030] Figure 2 is Figure 1 the top view of the U-shaped shunt pipe in

[0031] Figure 3 is Figure 1 the left view of the U-shaped shunt pipe in Detailed Description of the Specific Embodiment

[0032] The following is further detailed through specific embodiments:

[0033] The marks in the attached drawings of the specification include: branch pipe 1, inlet end 10, arc pipe 110, upper branch pipe 11, lower branch pipe 12, connecting pipe 2, arc end 20, connecting plate 3, first discharge pipe 31, second discharge pipe 32, third discharge pipe 33, fourth discharge pipe 34, fifth discharge pipe 35, first sand-scooping pipe 41, second sand-scooping pipe 42, third sand-scooping pipe 43.

[0034] Embodiment

[0035] As Figures 1-3As shown in the figure, a suction manifold structure of a fracturing pump includes a U-shaped shunt pipe. The U-shaped open end of the U-shaped shunt pipe converges to form an inlet end 10, and the arc end 20 of the U-shaped shunt pipe becomes the distal end. The two branch pipes 1 of the U-shaped shunt pipe are connected through a connecting pipe 2. A plurality of discharge pipes are sequentially arranged on one branch pipe 1, and the connecting pipe 2 is arranged in the middle section or after the middle section of the U-shaped shunt pipe.

[0036] Specifically, in this embodiment, there are five groups of discharge pipes, which are the first discharge pipe 31, the second discharge pipe 32, the third discharge pipe 33, the fourth discharge pipe 34, and the fifth discharge pipe 35 from left to right. The outlet ends of the five groups of discharge pipes are connected into a whole through a connecting plate 3, and the connecting plate 3 is horizontally arranged; during use, the connecting plate 3 is connected to the input end of the piston pump through bolts, and a sealing ring is arranged at the connection end of the two. After connection, each discharge pipe is in one-to-one correspondence and communication with the inlets of multiple cylinders of the piston pump.

[0037] In this embodiment, the U-shaped shunt pipe is inclined, and the arc end 20 of the U-shaped shunt pipe is higher than the inlet end 10; specifically, the angle between the axis of each branch pipe 1 and the horizontal plane can be set to 2°, 3°, 4°, or 5°, and in this embodiment, it is preferably set to 3°. Specifically, for the convenience of distinction, the two branch pipes 1 are divided into an upper branch pipe 11 and a lower branch pipe 12. The inlet end 10 of the upper branch pipe 11 is connected to the lower branch pipe 12 through an arc pipe 110. After the input fracturing fluid enters from the inlet end 10, it is divided into two paths by the upper branch pipe 11 and the lower branch pipe 12. The fluid in the upper branch pipe 11 is shunted to the first discharge pipe 31, the second discharge pipe 32, the third discharge pipe 33, the fourth discharge pipe 34, and the fifth discharge pipe 35; the connecting pipe 2 arranged between the upper branch pipe 11 and the lower branch pipe 12 is located between the third discharge pipe 33 and the fourth discharge pipe 34, so that a part of the fluid in the lower branch pipe 12 converges into the upper branch pipe 11 along the connecting pipe 2 and is shunted again, and a part converges into the upper branch pipe 11 along the arc end 20 at the back end and preferentially enters the fifth discharge pipe 35, so as to achieve relatively uniform shunting.

[0038] In this embodiment, the arc end 20 of the U-shaped shunt pipe is detachably connected to the two branch pipes 1. Specifically, the arc end 20 adopts a U-shaped pipe, and the two open ends of the U-shaped pipe are respectively connected to the upper branch pipe 11 and the lower branch pipe 12 through a clamp. Connecting two pipes through a clamp is an existing technology and will not be elaborated in detail here; the clamp connection method is relatively simple and is convenient for subsequent disassembly of the arc end 20 to clean the inner wall of the pipe.

[0039] For facilitating the sand cleaning operation of the branch pipe 1, in this embodiment, a first sand scooping pipe 41 and a second sand scooping pipe 42 are arranged on the upper branch pipe 11. The first sand scooping pipe 41 is located between the second discharge pipe 32 and the third discharge pipe 33, and the second sand scooping pipe 42 is located between the fourth discharge pipe 34 and the fifth discharge pipe 35. A third sand scooping pipe 43 is arranged on the lower branch pipe 12, and the third sand scooping pipe 43 is located at the rear end of the connecting pipe 2. Moreover, the first sand scooping pipe 41, the second sand scooping pipe 42, and the third sand scooping pipe 43 are closed by plug covers. When sand scooping treatment is required, the plug covers can be opened to clean the sediment in the branch pipe 1.

[0040] In this application, by transforming the structure of the suction manifold, the original single shunt pipe is set to two shunt pipes. The two shunt fluids are then collected again through the connecting pipe 2 and the arc end 20. When they are collected, a counteracting effect is generated, which can play a certain scouring role on the deposited slurry, facilitating the reduction of problems such as sand accumulation and sand blockage. In addition, the distal end of the shunt pipe in this application is of an arc-shaped structure, and the characteristics of this structure can further reduce the problem of sediment accumulation at the distal end. Finally, by shunting the fracturing fluid and then collecting and shunting it, it is beneficial to improve the shunt uniformity and reduce the pressure fluctuation, so as to ensure that the suction flow rate and pressure of each cylinder of the piston pump are more balanced, and the service life of the piston pump can be effectively improved.

[0041] The above are only the embodiments of the present utility model. The utility model is not limited to the fields involved in this embodiment case. Common knowledge such as the specific structures and characteristics known in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A suction manifold structure of a fracturing pump, characterized in that, It includes a U-shaped shunt pipe. The U-shaped open ends of the U-shaped shunt pipe converge to form an inlet end, and the arc ends of the U-shaped shunt pipe become the distal ends. The two branch pipes of the U-shaped shunt pipe are connected through a connecting pipe. Multiple groups of discharge pipes are sequentially arranged on one branch pipe, and the connecting pipe is arranged in the middle section or after the middle section of the U-shaped shunt pipe.

2. The structure of the suction manifold of a fracturing pump according to claim 1, wherein: There are five groups of discharge pipes, which are the first discharge pipe, the second discharge pipe, the third discharge pipe, the fourth discharge pipe, and the fifth discharge pipe in sequence from left to right. The outlet ends of the five groups of discharge pipes are connected through a connecting plate. The connecting plate is horizontally arranged. The U-shaped shunt pipe is inclined, and the arc end of the U-shaped shunt pipe is higher than the inlet end.

3. The structure of a fracturing pump suction manifold according to claim 2, characterized in that: The included angle between the axis of the branch pipe and the horizontal plane is 2 - 5°.

4. A suction manifold structure of a fracturing pump according to any one of claims 1-3, characterized in that: The arc end of the U-shaped shunt pipe is detachably connected to the two branch pipes.

5. The structure of the suction manifold of a fracturing pump according to claim 4, characterized in that: The arc end and the two branch pipes are connected through a clamp.

6. The structure of a fracturing pump suction manifold according to claim 5, characterized in that: The two branch pipes are respectively an upper branch pipe and a lower branch pipe. The inlet end of the upper branch pipe is connected to the lower branch pipe through an arc pipe.

7. The structure of a suction manifold for a fracturing pump according to claim 6, wherein: A first sand-scooping pipe and a second sand-scooping pipe are arranged on the upper branch pipe. The first sand-scooping pipe is located between the second discharge pipe and the third discharge pipe, and the second sand-scooping pipe is located between the fourth discharge pipe and the fifth discharge pipe.

8. A structure of a suction manifold of a fracturing pump according to claim 7, characterized in that: The connecting pipe is located between the third discharge pipe and the fourth discharge pipe.

9. The structure of a suction manifold for a fracturing pump according to claim 8, characterized in that: A third sand-scooping pipe is arranged on the lower branch pipe. The third sand-scooping pipe is located at the rear end of the connecting pipe.

10. The structure of a suction manifold for a fracturing pump according to claim 9, characterized in that: The first sand-scooping pipe, the second sand-scooping pipe, and the third sand-scooping pipe are closed through a plug.

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