CN115324893A - Oil-gas mixed transportation skid-mounted device special for oil field - Google Patents

Abstract

The invention belongs to the field of oilfield conveying equipment, and particularly relates to a skid-mounted special oil-gas mixed conveying device for an oilfield. The specific technical scheme is as follows: the end face tooth profile of the screw rotor is a cycloid ab, an arc bc and an involute cf which are connected in sequence. The tooth profile is simple and smooth, the friction area between the screw and the hole is reduced, and the function of forming an oil wedge is added after the glue is coated.

Description

A special oil and gas mixed transportation skid for oil field

technical field

The invention belongs to the field of oilfield transportation equipment, and in particular relates to a special oil-gas mixed transportation skid for oilfields.

Background technique

The twin-screw pump belongs to the volumetric pump. It consists of a pair of left and right helical screws with different rotation directions and the inner wall of the sealing bush. During the rotation of the screws, the sealing cavity is gradually established, and the sealing cavity is continuously drawn from the suction end of the pump along the axial direction as the screw rotates. Move to the discharge end. The medium sealed in the sealing chamber is continuously discharged. The screw pump has many advantages such as stable conveying medium, low turbulent flow of the ejected medium, weak pressure pulsation, small mechanical vibration, and low noise.

The existing twin-screw pump has the following defects during use:

1. After the screw meshes, the adjacent tooth grooves communicate with each other due to the leakage triangle defect of the tooth shape itself, which reduces the volumetric efficiency of the pump.

2. After the screw is matched, the large gap will lead to poor self-priming performance, and it is not easy to form high pressure.

3. It is easy to get stuck in the pump.

Contents of the invention

In order to solve the above-mentioned technical problems, the object of the present invention is to provide a skid mounted for oil and gas mixed transportation for oil fields.

In order to achieve the purpose of the above invention, the technical solution adopted in the present invention is: a screw rotor, the tooth profile line of the end surface of the screw rotor is a line segment ab, a line segment bc, and a line segment cf connected in sequence, and the line segment ab is a cycloid, The line segment bc is an arc line, and the line segment cf is an involute;

The curve equation of the cycloid ab is as follows:

x=[cos(λ-θ)-k cos(λ-2θ)]d _j ;

y=[sin(λ-θ)-k sin(λ-2θ)]d _j ;

The curve equation of the involute cf is as follows:

x=[cosθ+θsinθ]d _j k/2;

y=[sinθ-θcosθ]dj k/2;

In the formula, the value of k is 0.65, the value of λ is 81°56'22", and d _j is the pitch circle diameter of the screw rotor.

Preferably: the axially outer side of the screw rotor is provided with rubber coating, and the rubber coating material is nitrile rubber, fluorine rubber, hydrogenated nitrile rubber, natural rubber, styrene butadiene rubber, food nitrile rubber, ethylene propylene rubber, chlorine One or more of sulfonated polyethylene rubber.

Preferably: D=1.3d _j , d=0.7d _j ; D is the addendum circle diameter of the screw rotor, d is the dedendum circle diameter of the screw rotor, and d _j is the pitch circle of the screw rotor diameter.

Correspondingly: an oil and gas metering and mixing pump, including a set of intermeshing active screw rotors and driven screw rotors, the active screw rotor is connected to the driving gear through the driving shaft, and the driven screw rotor is connected to the driven screw rotor through the driven shaft The driven gear is connected, and the driving gear meshes with the driven gear.

Preferably: a cartridge mechanical seal is provided between the driving screw rotor and the driving gear, and between the driven screw rotor and the driven gear.

Preferably: cylindrical roller bearings are arranged on the side of the driving gear and the driven gear near the mechanical seal of the assembly;

And/or, the driving gear and the side of the driven gear are provided with double-row angular contact bearings far away from the cartridge mechanical seal.

Preferably: it includes a housing, and along the conveying direction of the screw rotor, a first cover plate and a second cover plate arranged on both sides of the housing, the first cover plate, the second cover plate and the housing can be Disconnect the connection.

Correspondingly: a special oil and gas mixed transport skid for oilfields, including a metering module, a flow regulating module, a filtering module, and a booster module arranged in sequence, the boosting module includes a mixed transport pump, the metering module, the flow regulating module, The filter module and booster module are controlled by the electrical control module.

Preferably: the metering module includes a gas flowmeter and a liquid flowmeter, the flow regulation module includes an inlet control valve, the filtering module includes an inlet filter, and the inlet filter includes a basket filter or a pipe filter .

Preferably, an inlet manifold is arranged downstream of the gas flowmeter and liquid flowmeter, the inlet control valve is arranged downstream of the inlet manifold, and the inlet filter and the mixing pump are arranged downstream of the inlet control valve. The outlet control valve and the outlet header are arranged in sequence downstream of the above-mentioned mixed transport pump.

Compared with the prior art, the present invention has the following beneficial effects:

1. The tooth profile line of the end surface of the screw rotor adopts cycloid, arc line and involute line connected in sequence. The tooth profile line is simple and smooth, which reduces the friction area between the screw and the hole. Function.

2. The twin-screw pump can transport low-viscosity medium, has strong self-priming ability and solid particle passing ability. The surface of the two screw rotors is coated with glue, and the working surface of the screw is more wear-resistant than the metal screw, and the suitable glue material is selected according to the needs of different media.

Description of drawings

Fig. 1 is the schematic diagram of the end surface shape of the screw rotor of the present invention;

Fig. 2 is the schematic diagram of the tooth profile line of the screw rotor end face of the present invention;

Fig. 3 is the schematic diagram of the engagement state of two screw rotors of the present invention;

Fig. 4 is a top view sectional schematic view of the mixed transport pump of the present invention;

Fig. 5 is the schematic cross-sectional view of the front view of the mixed transport pump of the present invention;

Fig. 6 is the schematic diagram of the left side view of the mixed infusion pump of the present invention;

Fig. 7 is a schematic top view of the oil-gas mixed transportation skid of the present invention;

Fig. 8 is a schematic front view of the oil-gas mixed transportation skid of the present invention.

In the figure: base 1, housing 2, first cover plate 3, second cover plate 4, glue application 5, driving screw rotor 6, driven screw rotor 7, driving shaft 8, driven shaft 9, driving gear 10, Driven gear 11, first bearing 12, second bearing 13, assembly mechanical seal 14, logistics inlet 15, logistics outlet 16, bearing seat 17, skid seat 18, electrical control cabinet 19, gas flow meter 20, inlet manifold 21. Inlet control valve 22, inlet filter 23, mixing pump 24, outlet control valve 25, outlet manifold 26, liquid flow meter 27.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The invention discloses a screw rotor. As shown in Fig. 1, the tooth profile line of the end surface of the screw rotor is a line segment ab, a line segment bc, and a line segment cf connected in sequence, the line segment ab is a cycloid, and the line segment bc is An arc line, the line segment cf is an involute. Cycloids, circular arcs and involutes connected in sequence are adopted, and the tooth profile is simple and smooth, which reduces the friction area between the screw and the hole.

Further, it includes two screw rotors that mesh with each other and have the same tooth profile on the end face, the meshing state is shown in Figure 3, the line segment ab is the force transmission edge in the meshing state, and the line segment cf is the sealing edge in the meshing state . It is not difficult to understand that the diameter of the addendum circle of the screw rotor is D, the diameter of the root circle of the screw rotor is d, and the diameter of the pitch circle of the screw rotor is d _j .

The curve equation of the cycloid ab is as follows:

x=[cos(λ-θ)-k cos(λ-2θ)]d _j ;

y=[sin(λ-θ)-k sin(λ-2θ)]d _j ;

The curve equation of the involute cf is as follows:

x=[cosθ+θsinθ]d _j k/2;

y=[sinθ-θcosθ]dj k/2;

R ² =(0.35d _j ) ² ·(1+θ ² ).

Wherein the value range of θ of the cycloid ab is 0-39°42′54″, the value of k is 0.65, and the value of λ is 81°56′22″. The value range of θ of the involute cf is 0-89°39′48″, R is the radius of the addendum circle, R=2D, and the value range is 0.35d _j -0.65d _j .

A preferred technical solution, D=1.3d _j , d=0.7d _j .

Further, as shown in Figure 1-3, the spiral teeth of the screw rotor are covered with glue 5 corresponding to its linear shape, that is, after the glue 5 is set, the line segment ab is still a cycloid, and the line segment bc is still a circular arc line, the line segment cf is still an involute. It should be noted that the circular arcs in this application refer to the arcs corresponding to ordinary circles. The material of the adhesive 5 can be one or more of nitrile rubber, fluororubber, hydrogenated nitrile rubber, natural rubber, styrene butadiene rubber, food nitrile rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, etc. By setting glue on the surface of the two screw rotors, the working surface of the screw is more wear-resistant than the metal screw, and the suitable glue material is selected according to the needs of different media.

The present invention also discloses an oil and gas metering and mixing pump, as shown in Fig. 4-6, which includes a base 1 and a pump body arranged on the base 1, and a group of gears with the same tooth profile on the end faces are arranged in the pump body. Drive screw rotor 6 , driven screw rotor 7 , one end of the drive screw rotor 6 is connected to a motor-driven drive gear 10 , and the drive gear 10 meshes with a driven gear 11 connected to the driven screw rotor 7 . The pump body is provided with a logistics inlet 15 and a logistics outlet 16 . Sealing bushes are arranged on the periphery of the active screw rotor 6 and the driven screw rotor 7, so that the two screw rotors can rotate in the sealing bushing, and a sealed cavity is formed between the two screw rotors and the inner wall of the sealing bushing. During work, the motor drives the driving gear 10 to rotate, the driving gear 10 rotates synchronously with the driving screw rotor 6, and the driving gear 10 drives the driven gear 11 to rotate, and the driven gear 11 rotates synchronously with the driven screw rotor 7, then the driving screw rotor 6 It rotates in the opposite direction to the driven screw rotor 7 . During the rotation of the screw rotor, a sealed cavity is gradually established, and the material outside the pump is sucked and pushed to the outlet of the screw pump.

Further, one end of the driving screw rotor 6 and the driven screw rotor 7 is respectively connected with a driving shaft 8 and a driven shaft 9, and the driving gear 10 and the driven gear 11 are arranged on the driving shaft 8 and the driven shaft respectively. 9 perimeter. That is, when rotating, there is no relative rotation between the driving gear 10 and the driving shaft 8, between the driven gear 10 and the driven shaft 9. The end of the driving gear 10 and the driven gear 11 away from the driving screw rotor 6 is provided with a gear cover.

Further, first bearings 12 and second bearings 13 are provided at both ends of the driving gear 10 and the driven gear 11 . The first bearing 12 is a cylindrical roller bearing, and is arranged on a side close to the driving screw rotor 6 . The second bearing 13 is a double-row angular contact bearing, and is arranged on a side away from the driving screw rotor 6 . The first bearing 12 and the second bearing 13 are arranged on the bearing seat 17 , and the bearing seat 17 is fixedly arranged in the housing 2 .

In order to keep the material in the two screw rotors from flowing into the gear system, a mechanical seal 14 is provided between the driving screw rotor 6 and the driving gear 10, and between the driven screw rotor 7 and the driven gear 11. The two cartridge mechanical seals 14 are sleeved on the driving shaft 8 and the driven shaft 9 respectively. The packaged mechanical seal 14 does not rotate with the driving shaft 8 and the driven shaft 9 .

Further, the pump body includes a casing 2 and a first cover plate 3 and a second cover plate 4 arranged on both sides of the casing 2, the first cover plate 3 is arranged on a side close to the driving screw rotor 6 side, the second cover plate 4 is arranged on the side close to the driving gear 10, and the first cover plate 3, the second cover plate 4 and the housing 2 are detachable by means of bolts. connect. By arranging the first cover plate 3 and the second cover plate 4, foreign dust and other impurities are prevented from entering the pump body, thereby affecting the transmission efficiency of the gear system and the screw rotor.

Further, the end of the driving shaft 8 away from the driving screw rotor 6 extends out of the housing 2 , that is, the driving shaft 8 passes through the second cover plate 4 and is connected to the output shaft of the motor. The driving shaft 8 is connected with the output shaft of the motor through a reduction gear. The seal between the driving shaft 8 and the second cover plate 4 adopts a skeleton seal.

The invention also discloses a special oil-gas mixed transportation skid for oil field, which includes a metering module, a flow regulation module, a filtering module, and a booster module arranged in sequence. , the flow regulating module, the filtering module and the booster module are controlled by the electrical control module.

Further, the metering module includes a gas flow meter 21, a liquid flow meter 27 and pipelines thereof. The flow regulating module includes an inlet control valve 22 and its pipeline, and the inlet control valve 22 is a regulating valve for regulating flow. The filter module includes an inlet filter 23 and its pipeline, and the inlet filter 23 can be a basket filter or a tube filter.

Further, the inlet manifold 21 is arranged downstream of the gas flowmeter 20 and the liquid flowmeter 27, the inlet control valve 22 is arranged downstream of the inlet manifold 21, and the inlet filter is arranged downstream of the inlet control valve 22. 23. Mixing pump 24, the outlet control valve 25 and the outlet manifold 26 are arranged in sequence downstream of the mixing pump. In order to work continuously, the inlet control valve 22, the inlet filter 23, the mixing pump 24, and the outlet control valve 25 are all in standby. The automatic control of these all equipments is controlled 19 by electric control cabinet, and all equipments are all integrated on the skid base, only need to move skid base during use.

The gas and liquid are measured by the gas flowmeter 20 and the liquid flowmeter 27 respectively, and then enter the inlet manifold 21 for mixing, then pass through the inlet control valve 22 to adjust the flow, and then enter the inlet filter 23 to filter solid impurities, and then enter the oil-gas mixing pump 24 Pressurized, the outlet flow is controlled by the outlet control valve 25 after the pressurization, and finally flows out through the outlet manifold 26.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Deformation, modification, modification, and replacement all should fall within the scope of protection determined by the claims of the present invention.

Claims (10)

1. A screw rotor, characterized in that: the tooth profile of the end face of the screw rotor is a cycloid ab, an arc line bc, and an involute cf connected in sequence; The curve equation of the cycloid ab is as follows: x=[cos(λ-θ)-k cos(λ-2θ)]d _j ; y=[sin(λ-θ)-k sin(λ-2θ)]d _j ; The curve equation of the involute cf is as follows: x=[cosθ+θsinθ]d _j k/2; y=[sinθ-θcosθ]dj k/2; In the formula, the value of k is 0.65, the value of λ is 81°56'22", and d _j is the pitch circle diameter of the screw rotor. 2. A screw rotor according to claim 1, characterized in that: said screw rotor is provided with glue (5) on the axially outer side, said glue (5) is made of nitrile rubber, fluorine rubber, hydrogenated One or more of nitrile rubber, natural rubber, styrene-butadiene rubber, food nitrile rubber, ethylene-propylene rubber, and chlorosulfonated polyethylene rubber. 3. A screw rotor according to claim 1 or 2, characterized in that: D=1.3d _j , d=0.7d _j ; D is the diameter of the addendum circle of the screw rotor, and d is the diameter of the screw rotor root diameter of the tooth. 4. An oil-gas metering and mixing pump, characterized in that: it includes a group of intermeshed active screw rotors (6) and driven screw rotors (7), and the active screw rotor (6) is connected to the drive shaft (8) The driving gear (10) is connected, the driven screw rotor (7) is connected with the driven gear (11) through the driven shaft (9), and the driving gear (10) meshes with the driven gear (11). 5. An oil-gas metering and mixing pump according to claim 4, characterized in that: between the driving screw rotor (6) and the driving gear (10), between the driven screw rotor (7) and the driven Cartridge mechanical seals (14) are arranged between the gears (11). 6. An oil-gas metering and mixing pump according to claim 5, characterized in that: one side of the driving gear (10) and the driven gear (11) and close to the mechanical seal (14) are provided with Cylindrical Roller Bearings; And/or, the driving gear (10), the side of the driven gear (11) is provided with a double-row angular contact bearing away from the mechanical seal (14). 7. An oil-gas metering and mixing pump according to claim 4, characterized in that it comprises a housing (2), and first cover plates ( 3). The second cover plate (4), the first cover plate (3), the second cover plate (4) and the housing (2) are detachably connected. 8. A special oil and gas mixed transportation skid for oilfields, characterized in that it includes a metering module, a flow regulation module, a filtering module, and a booster module arranged in sequence, and the booster module includes the mixed transportation system described in claims 4-7. The pump (24), the metering module, the flow regulating module, the filtering module and the boosting module are controlled by the electrical control module. 9. A special oil and gas mixed transport skid for oilfields according to claim 8, characterized in that: the metering module includes a gas flow meter (21) and a liquid flow meter (27), and the flow adjustment module includes an inlet control module valve (22), the filter module includes an inlet filter (23), the inlet filter (23) includes a basket filter or a tube filter. 10. A special oil and gas mixed transportation skid for oilfields according to claim 9, characterized in that: inlet headers (21) are provided downstream of the gas flowmeter (20) and liquid flowmeter (27), and the inlet The inlet control valve (22) is sequentially arranged downstream of the manifold (21), the inlet filter (23) and the mixed pump (24) are arranged downstream of the inlet control valve (22), and the downstream of the mixed pump is sequentially Set the outlet control valve (25) and the outlet manifold (26).

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