A kind of oil gas well puts spray erosion resistance throttle manifold
Technical field
The invention belongs to the borehole operation technical field such as well fracturing, acidifying, it is specifically related to a kind of oil gas well and puts spray erosion resistance throttle manifold.
Background technology
Current horizontal well multi-stage water power abrasive perforating, annular fracturing Technology obtains large-scale promotion application at Changqing oilfields, put after pressure break and spray process needs to casing annulus pressure, tubing pressure controls, existing throttle manifold adopts gate valve or needle-valve to throttle usually, also some throttle manifolds are had to adopt fixation type throttle valve and gate valve to throttle, but due to gate valve, needle-valve and fixation type throttle valve erosion wear resistance are poor, especially put in spray operation process after pressure break, with a large amount of reservoir sand or perforation sand in sleeve pipe returning fluid, to gate valve, needle-valve and fixation type throttle valve cause serious erosion, and pressure-controlling effect is not good, usually often put spray at scene and just can damage a gate valve in one or two hour, needle-valve or fixation type throttle valve.
Summary of the invention
It is an object of the invention to solve that existing throttle manifold puts positive choke pressure drop sudden change in spray process after pressure break, excessive, the serious erosion of positive choke exit end falls in pressure drop regulation and control out of true (i.e. oil, cover pressure-controlling out of true), temperature, anti-erosion pipe nipple entrance end erosion damage, gate valve and the serious erosion damage of needle-valve problem.
For this reason, the present invention provides a kind of oil gas well and puts spray erosion resistance throttle manifold, comprises pipeline four-way one, pipeline five logical two, is connected by pipeline one, pipeline one is provided with manual platform gate valve four between pipeline four-way one and pipeline five logical two;
One of them mouth of pipe of pipeline four-way one is communicated with fixation type throttle valve by pipeline two, the axial centre line of pipeline two is perpendicular to the axial centre line of pipeline one, pipeline two is provided with manual platform gate valve one, fixation type throttle valve is connected with pipeline five logical by reducing pipe nipple one, and the axial centerline parallel of reducing pipe nipple one is in the axial centre line of pipeline one;
One of them mouth of pipe of pipeline five logical two is connected with pipeline five logical by pipeline five, the axial centerline parallel of pipeline five is in the axial centre line of pipeline two, pipeline five is provided with manual platform gate valve five, the another one mouth of pipe of pipeline five logical two is connected with manual needle-like formula throttling valve by pipeline four, pipeline four is provided with manual platform gate valve three, manual needle-like formula throttling valve is connected with pipeline four-way two by reducing pipe nipple two, by pipeline tee joint between pipeline four-way two and pipeline five logical, pipeline three is provided with manual platform gate valve two;
The inner chamber of described fixation type throttle valve is provided with reducing oil nozzle, and reducing oil nozzle is connected with reducing pipe nipple one.
Described reducing oil nozzle is the cylindrical structural of hollow, and the internal diameter of inner chamber is gradual change type, near the largest diameter of reducing pipe nipple one one end.
Described reducing pipe nipple one is identical with the structure of reducing pipe nipple two, and the internal diameter of inner chamber is gradual change type, and the diameter of reducing pipe nipple one near reducing oil nozzle one end is minimum, and the diameter of reducing pipe nipple two near pipeline four-way two one end is minimum.
Described reducing oil nozzle and reducing pipe nipple one card connect.
Described reducing oil nozzle is threaded with reducing pipe nipple one.
On the internal chamber wall of described reducing pipe nipple one, reducing pipe nipple two and reducing oil nozzle, all heap is welded with YG8 Wimet tungsten carbide material.
The thickness of built-up welding is 4mm.
Throttle manifold overall long 2595mm, wide 1450mm, high 600mm.
The size of described reducing oil nozzle is 2��20mm.
2-9/16 selected by described pipeline one, pipeline two, pipeline three, pipeline four, pipeline five " pipeline, the logical footpath of pipeline is 65mm.
The useful effect of the present invention: this kind of oil gas well provided by the invention puts spray erosion resistance throttle manifold, utilize the change of the internal structure of oil nozzle and anti-erosion pipe nipple, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve the entrance end erosion of oil nozzle outlet end erosion and anti-erosion pipe nipple, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously. Achieve the accurate control to oil pipe, casing pressure by the different manual platform gate valve of switch, needle-valve combination, reduce the row's of returning sand-carrying agent to the erosion of oil nozzle, pipe nipple, gate valve, it is to increase surface throttling efficiency. It is convenient that erosion resistance throttling oil nozzle and erosion resistance pipe nipple are changed, and has good erosive wear resistance. Not only increasing the reducing pressure by regulating flow effect of throttle manifold, also a saving the replacing cost of manifold consumable accessory, extend the work-ing life of throttle manifold, practical, effect is remarkable, puts spray operation after being applicable to well fracturing.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is the structural representation that oil gas well puts spray erosion resistance throttle manifold.
Description of reference numerals: 1, pipeline four-way one; 2, manual platform gate valve one; 3, fixation type throttle valve; 4, reducing oil nozzle; 5, reducing pipe nipple one; 6, pipeline five logical one; 7, manual platform gate valve two; 8, pipeline four-way two I; 9, reducing pipe nipple two; 10, manual needle-like formula throttling valve; 11, manual platform gate valve three; 12, pipeline five logical two; 13, manual platform gate valve four; 14, manual platform gate valve five; 15, pipeline one; 16, pipeline two; 17, pipeline three; 18, pipeline four; 19, pipeline five.
Embodiment
Embodiment 1:
As shown in Figure 1, a kind of oil gas well puts spray erosion resistance throttle manifold, comprises pipeline four-way 1, pipeline five logical 2 12, is connected by pipeline 1, pipeline 1 is provided with manual platform gate valve 4 13 between pipeline four-way 1 and pipeline five logical 2 12;
One of them mouth of pipe of pipeline four-way 1 is communicated with fixation type throttle valve 3 by pipeline 2 16, the axial centre line of pipeline 2 16 is perpendicular to the axial centre line of pipeline 1, pipeline 2 16 is provided with manual platform gate valve 1, fixation type throttle valve 3 is connected with pipeline five logical 1 by reducing pipe nipple 1, and the axial centerline parallel of reducing pipe nipple 1 is in the axial centre line of pipeline 1;
One of them mouth of pipe of pipeline five logical 2 12 is connected with pipeline five logical 1 by pipeline 5 19, the axial centerline parallel of pipeline 5 19 is in the axial centre line of pipeline 2 16, pipeline 5 19 is provided with manual platform gate valve 5 14, the another one mouth of pipe of pipeline five logical 2 12 is connected with manual needle-like formula throttling valve 10 by pipeline 4 18, pipeline 4 18 is provided with manual platform gate valve 3 11, manual needle-like formula throttling valve 10 is connected with pipeline four-way 28 by reducing pipe nipple 29, it is connected by pipeline 3 17 between pipeline four-way 28 and pipeline five logical 1, pipeline 3 17 is provided with manual platform gate valve 27,
The inner chamber of described fixation type throttle valve 3 is provided with reducing oil nozzle 4, and reducing oil nozzle 4 is connected with reducing pipe nipple 1.
This throttle manifold is two enter scene 2 structure, and side adopts manual needle-like formula throttling valve 10 to control, and another side adopts fixation type throttle valve 3 to control, middle in line. Manifold internally-fixed throttling valve 3 is built with the erosion resistance reducing oil nozzle 4 of particular design, and downstream is provided with the erosion resistance reducing pipe nipple 1 of particular design, and manual needle-like formula throttling valve 10 downstream is provided with the erosion resistance reducing pipe nipple 29 of particular design equally. By opening or close different manual platform gate valves, needle-valve array mode, select the erosion resistance reducing oil nozzle 4 of the different size being pre-installed in fixation type throttle valve 3, control two-way throttles, 1 tunnel is in line, thus realize the accurate control put after pressure break in spray process oil pipe, casing pressure, prevent hypertonia from causing pipeline to burst, or hypotony causes stratum to tell sand, avoid oil nozzle erosion in throttle manifold.
The mode of connection of above-mentioned throttle manifold is: in manifold, all connections adopt Flange joint, and flange is 2-7/8 " EUER27 standard 350 flange, supporting bolt is M27 �� 3 �� 175 threaded stud; Throttle manifold entrance and well mouth oil pipe gate valve, well head cover sluice valve are connected, and throttle manifold outlet is connected with relief line, spray discharge capacity and pressure at the erosion resistance reducing oil nozzle of fixation type throttle valve built with suitable dimension according to putting after on-the-spot pressure break.
Spray discharge capacity and oil is put according to after on-the-spot hydraulic perforating pressure break, cover pressure-controlling needs, reducing oil nozzle 4 is installed in fixation type throttle valve, the size of reducing oil nozzle 4 needs to select according to scene, by switch manual platform gate valve 1 when putting spray, manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual needle-like formula throttling valve 10, to oil pipe, casing pressure accurately controls, line pressure release control is carried out by switch manual platform gate valve 5 14 during hypertonia, prevent superpressure from affecting control blowout manifold quality safety, realize throttling and put spray, concrete, this oil gas well puts the working process of spray erosion resistance throttle manifold:
First manifold cover on pipeline four-way 1 is put into mouth be connected with well head cover sluice valve, manifold oil on pipeline five logical 2 12 is put into mouth be connected with well mouth oil pipe gate valve, the manifold outlet at logical one 6 places of pipeline five is connected with high pressure hose or hard pipeline (liquids recovery), and the manifold outlet at pipeline four-way 28 place is connected with hard relief line;
After above-mentioned connection completes, jet flow amount and well head oil, cover pressure-controlling needs are put according to oil gas well, select the reducing oil nozzle 4 of suitable dimension, again reducing oil nozzle 4 is loaded in fixation type throttle valve 3, reducing pipe nipple 1 is installed in the downstream of fixation type throttle valve 3, installs reducing pipe nipple 29 equally in manual needle-like formula throttling valve 10 downstream;
When sleeve pipe puts spray, turning off well mouth oil pipe gate valve, open manual platform gate valve 1, close manual platform gate valve 4 13, manual platform gate valve 5 14, manual platform gate valve 27, can throttle accurately control to casing pressure; If casing pressure is too high, can opening manual platform gate valve 4 13, manual platform gate valve 5 14, close manual platform gate valve 3 11, cover tapping body flows out from logical one 6 exits of pipeline five, release part liquid pressure;
When oil pipe puts spray, turn off well head cover sluice valve, opening manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual platform gate valve 1 and manual needle-like formula throttling valve 10, close manual platform gate valve 5 14, can throttle accurately control to tubing pressure; If oil puts hypertonia, can opening manual platform gate valve 5 14, oil tapping body is logical 1 from pipeline five, the outlet of pipeline four-way 28 is flowed out, release part liquid pressure;
Put after spray terminates, close well head sleeve pipe gate valve and oil pipe gate valve, the throttle manifold fixation type throttle valve 3 of dismounting cleaning in time, manual needle-like formula throttling valve 10 and all manual platform gate valves, maintenance or replacing erosion resistance reducing oil nozzle, needle-valve, gate valve etc., again to put spray operation.
This kind of oil gas well provided by the invention puts spray erosion resistance throttle manifold, utilize the change of the internal structure of oil nozzle and anti-erosion pipe nipple, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve the entrance end erosion of oil nozzle outlet end erosion and anti-erosion pipe nipple, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously. Achieve the accurate control to oil pipe, casing pressure by the different manual platform gate valve of switch, needle-valve combination, reduce the row's of returning sand-carrying agent to the erosion of oil nozzle, pipe nipple, gate valve, it is to increase surface throttling efficiency. It is convenient that erosion resistance throttling oil nozzle and erosion resistance pipe nipple are changed, and has good erosive wear resistance. Not only increasing the reducing pressure by regulating flow effect of throttle manifold, also a saving the replacing cost of manifold consumable accessory, extend the work-ing life of throttle manifold, practical, effect is remarkable, puts spray operation after being applicable to well fracturing.
Embodiment 2:
On the basis of embodiment 1, described reducing oil nozzle 4 is the cylindrical structural of hollow, the internal diameter of inner chamber is gradual change type, near the largest diameter of reducing pipe nipple 1 one end, erosion resistance reducing oil nozzle 4 chock pressure difference can regulate between 0.2 ~ 35MPa, with design pressure error within the scope of �� 0.5MPa. Utilize the change of reducing oil nozzle 4 internal structure, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve oil nozzle outlet end erosion, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously.
The mode of connection of above-mentioned throttle manifold is: in manifold, all connections adopt Flange joint, and flange is 2-7/8 " EUER27 standard 350 flange, supporting bolt is M27 �� 3 �� 175 threaded stud; Throttle manifold entrance and well mouth oil pipe gate valve, well head cover sluice valve are connected, and throttle manifold outlet is connected with relief line, spray discharge capacity and pressure at the erosion resistance reducing oil nozzle of fixation type throttle valve built with suitable dimension according to putting after on-the-spot pressure break.
Spray discharge capacity and oil is put according to after on-the-spot hydraulic perforating pressure break, cover pressure-controlling needs, reducing oil nozzle 4 is installed in fixation type throttle valve, the size of reducing oil nozzle 4 needs to select according to scene, by switch manual platform gate valve 1 when putting spray, manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual needle-like formula throttling valve 10, to oil pipe, casing pressure accurately controls, line pressure release control is carried out by switch manual platform gate valve 5 14 during hypertonia, prevent superpressure from affecting control blowout manifold quality safety, realize throttling and put spray, concrete, this oil gas well puts the working process of spray erosion resistance throttle manifold:
First manifold cover on pipeline four-way 1 is put into mouth be connected with well head cover sluice valve, manifold oil on pipeline five logical 2 12 is put into mouth be connected with well mouth oil pipe gate valve, the manifold outlet at logical one 6 places of pipeline five is connected with high pressure hose or hard pipeline (liquids recovery), and the manifold outlet at pipeline four-way 28 place is connected with hard relief line;
After above-mentioned connection completes, jet flow amount and well head oil, cover pressure-controlling needs are put according to oil gas well, select the reducing oil nozzle 4 of suitable dimension, again reducing oil nozzle 4 is loaded in fixation type throttle valve 3, reducing pipe nipple 1 is installed in the downstream of fixation type throttle valve 3, installs reducing pipe nipple 29 equally in manual needle-like formula throttling valve 10 downstream;
When sleeve pipe puts spray, turning off well mouth oil pipe gate valve, open manual platform gate valve 1, close manual platform gate valve 4 13, manual platform gate valve 5 14, manual platform gate valve 27, can throttle accurately control to casing pressure; If casing pressure is too high, can opening manual platform gate valve 4 13, manual platform gate valve 5 14, close manual platform gate valve 3 11, cover tapping body flows out from logical one 6 exits of pipeline five, release part liquid pressure;
When oil pipe puts spray, turn off well head cover sluice valve, opening manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual platform gate valve 1 and manual needle-like formula throttling valve 10, close manual platform gate valve 5 14, can throttle accurately control to tubing pressure; If oil puts hypertonia, can opening manual platform gate valve 5 14, oil tapping body is logical 1 from pipeline five, the outlet of pipeline four-way 28 is flowed out, release part liquid pressure;
Put after spray terminates, close well head sleeve pipe gate valve and oil pipe gate valve, the throttle manifold fixation type throttle valve 3 of dismounting cleaning in time, manual needle-like formula throttling valve 10 and all manual platform gate valves, maintenance or replacing erosion resistance reducing oil nozzle, needle-valve, gate valve etc., again to put spray operation.
This kind of oil gas well provided by the invention puts spray erosion resistance throttle manifold, utilize the change of the internal structure of oil nozzle and anti-erosion pipe nipple, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve the entrance end erosion of oil nozzle outlet end erosion and anti-erosion pipe nipple, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously. Achieve the accurate control to oil pipe, casing pressure by the different manual platform gate valve of switch, needle-valve combination, reduce the row's of returning sand-carrying agent to the erosion of oil nozzle, pipe nipple, gate valve, it is to increase surface throttling efficiency. It is convenient that erosion resistance throttling oil nozzle and erosion resistance pipe nipple are changed, and has good erosive wear resistance. Not only increasing the reducing pressure by regulating flow effect of throttle manifold, also a saving the replacing cost of manifold consumable accessory, extend the work-ing life of throttle manifold, practical, effect is remarkable, puts spray operation after being applicable to well fracturing.
Embodiment 3:
Described reducing pipe nipple 1 is identical with the structure of reducing pipe nipple 29, and the internal diameter of inner chamber is gradual change type, and the diameter of reducing pipe nipple 1 near reducing oil nozzle 4 one end is minimum, and the diameter of reducing pipe nipple 29 near pipeline four-way 28 one end is minimum. Utilize reducing pipe nipple 1 and the change of reducing pipe nipple 29 internal structure, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve reducing pipe nipple 1 and reducing pipe nipple 29 entrance end erosion, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously.
The mode of connection of above-mentioned throttle manifold is: in manifold, all connections adopt Flange joint, and flange is 2-7/8 " EUER27 standard 350 flange, supporting bolt is M27 �� 3 �� 175 threaded stud; Throttle manifold entrance and well mouth oil pipe gate valve, well head cover sluice valve are connected, and throttle manifold outlet is connected with relief line, spray discharge capacity and pressure at the erosion resistance reducing oil nozzle of fixation type throttle valve built with suitable dimension according to putting after on-the-spot pressure break.
Spray discharge capacity and oil is put according to after on-the-spot hydraulic perforating pressure break, cover pressure-controlling needs, reducing oil nozzle 4 is installed in fixation type throttle valve, the size of reducing oil nozzle 4 needs to select according to scene, by switch manual platform gate valve 1 when putting spray, manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual needle-like formula throttling valve 10, to oil pipe, casing pressure accurately controls, line pressure release control is carried out by switch manual platform gate valve 5 14 during hypertonia, prevent superpressure from affecting control blowout manifold quality safety, realize throttling and put spray, concrete, this oil gas well puts the working process of spray erosion resistance throttle manifold:
First manifold cover on pipeline four-way 1 is put into mouth be connected with well head cover sluice valve, manifold oil on pipeline five logical 2 12 is put into mouth be connected with well mouth oil pipe gate valve, the manifold outlet at logical one 6 places of pipeline five is connected with high pressure hose or hard pipeline (liquids recovery), and the manifold outlet at pipeline four-way 28 place is connected with hard relief line;
After above-mentioned connection completes, jet flow amount and well head oil, cover pressure-controlling needs are put according to oil gas well, select the reducing oil nozzle 4 of suitable dimension, again reducing oil nozzle 4 is loaded in fixation type throttle valve 3, reducing pipe nipple 1 is installed in the downstream of fixation type throttle valve 3, installs reducing pipe nipple 29 equally in manual needle-like formula throttling valve 10 downstream;
When sleeve pipe puts spray, turning off well mouth oil pipe gate valve, open manual platform gate valve 1, close manual platform gate valve 4 13, manual platform gate valve 5 14, manual platform gate valve 27, can throttle accurately control to casing pressure; If casing pressure is too high, can opening manual platform gate valve 4 13, manual platform gate valve 5 14, close manual platform gate valve 3 11, cover tapping body flows out from logical one 6 exits of pipeline five, release part liquid pressure;
When oil pipe puts spray, turn off well head cover sluice valve, opening manual platform gate valve 4 13, manual platform gate valve 3 11, manual platform gate valve 27, manual platform gate valve 1 and manual needle-like formula throttling valve 10, close manual platform gate valve 5 14, can throttle accurately control to tubing pressure; If oil puts hypertonia, can opening manual platform gate valve 5 14, oil tapping body is logical 1 from pipeline five, the outlet of pipeline four-way 28 is flowed out, release part liquid pressure;
Put after spray terminates, close well head sleeve pipe gate valve and oil pipe gate valve, the throttle manifold fixation type throttle valve 3 of dismounting cleaning in time, manual needle-like formula throttling valve 10 and all manual platform gate valves, maintenance or replacing erosion resistance reducing oil nozzle, needle-valve, gate valve etc., again to put spray operation.
This kind of oil gas well provided by the invention puts spray erosion resistance throttle manifold, utilize the change of the internal structure of oil nozzle and anti-erosion pipe nipple, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve the entrance end erosion of oil nozzle outlet end erosion and anti-erosion pipe nipple, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously. Achieve the accurate control to oil pipe, casing pressure by the different manual platform gate valve of switch, needle-valve combination, reduce the row's of returning sand-carrying agent to the erosion of oil nozzle, pipe nipple, gate valve, it is to increase surface throttling efficiency. It is convenient that erosion resistance throttling oil nozzle and erosion resistance pipe nipple are changed, and has good erosive wear resistance. Not only increasing the reducing pressure by regulating flow effect of throttle manifold, also a saving the replacing cost of manifold consumable accessory, extend the work-ing life of throttle manifold, practical, effect is remarkable, puts spray operation after being applicable to well fracturing.
Embodiment 4:
On the basis of embodiment 1, described reducing oil nozzle 4 and reducing pipe nipple 1 card connects or is threaded, and this kind of mode of connection is for convenience detach, is putting after spray terminates, it is possible to dismantle in time, maintenance or change reducing oil nozzle, again to put spray operation.
Embodiment 5:
On the internal chamber wall of described reducing pipe nipple 1, reducing pipe nipple 29 and reducing oil nozzle 4, all heap is welded with YG8 Wimet tungsten carbide material, and the thickness of built-up welding is 4mm, has higher erosive wear resistance.
Embodiment 6:
Throttle manifold overall long 2595mm, wide 1450mm, high 600mm, the size of described reducing oil nozzle 4 is 2��20mm, 2-9/16 selected by described pipeline 1, pipeline 2 16, pipeline 3 17, pipeline 4 18, pipeline 5 19 " pipeline, pressure-bearing 35MPa, the logical footpath of pipeline is 65mm.
This kind of oil gas well provided by the invention puts spray erosion resistance throttle manifold, utilize the change of the internal structure of oil nozzle and anti-erosion pipe nipple, when making this throttle manifold of fluid flow that it returns out from oil pipe, sleeve pipe, flow velocity and pressure steadily reduce, pressure drop slowly reduces, temperature is fallen gently, the control of oil pipe, casing pressure is accurately, thus effectively solve the entrance end erosion of oil nozzle outlet end erosion and anti-erosion pipe nipple, avoid forming gas hydrate to block throttle manifold and well head because the temperature that throttles falls too fast simultaneously. Achieve the accurate control to oil pipe, casing pressure by the different manual platform gate valve of switch, needle-valve combination, reduce the row's of returning sand-carrying agent to the erosion of oil nozzle, pipe nipple, gate valve, it is to increase surface throttling efficiency. It is convenient that erosion resistance throttling oil nozzle and erosion resistance pipe nipple are changed, and has good erosive wear resistance. Not only increasing the reducing pressure by regulating flow effect of throttle manifold, also a saving the replacing cost of manifold consumable accessory, extend the work-ing life of throttle manifold, practical, effect is remarkable, puts spray operation after being applicable to well fracturing.
More than enumerating is only the illustration to the present invention, does not form the restriction to protection scope of the present invention, and every design same or similar with the present invention all belongs within protection scope of the present invention. The parts that the present embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.