CN101701515A - Rodless oil production system driven by underground rotating motor - Google Patents

Abstract

A rodless oil production system driven by an underground rotating motor is applied to the technical field of oil production in oil fields. The device consists of a pressure balancing device, a three-phase asynchronous rotating motor, a mechanical conversion mechanism, a lower cylinder barrel and a lower plug. The balance piston and the upper spacer ring are arranged in the upper cylinder barrel, the breathing hole is formed in the wall of the upper cylinder barrel, the three-phase asynchronous rotating motor is fixed at the lower end of the upper cylinder barrel, the axial through hole is formed in the center of a motor shaft, the lower cylinder barrel and the lower plug are fixed at the lower end of the three-phase asynchronous rotating motor, the mechanical conversion mechanism is arranged in the lower cylinder barrel and comprises a coupler, a lead screw and a nut, the upper end of the coupler is connected with the motor shaft, the lower end of the coupler is connected with the nut, and the. The motor shaft drives the nut to rotate through the coupler, and the screw rod is driven by the nut to do linear reciprocating motion to drive the oil well pump to realize lifting and oil pumping. The rodless oil production system driven by the underground rotating motor solves the problem of eccentric wear of a rod pipe in a directional well, improves the efficiency of the oil pump and reduces energy consumption.

Description

The Rodless oil extraction system that underground rotation motor drives

Technical field

The present invention relates to oil recovery technique field, oil field, particularly Rodless oil extraction is the Rodless oil extraction system that a kind of underground rotation motor drives.Be applicable to that the producing well of rod and tube partial-wear easily takes place for directional well, inclined shaft.

Background technology

At present, advantage such as in mechanical oil recovery, oil pumper sucker rod pump hoisting system is simple in structure with it, technology maturation, reliability and durability, wide adaptability has occupied leading position, accounts for about 90% of artificially lifted well's number.But part also comes with some shortcomings: at first, have intrinsic reciprocal eccentric wear problem between sucker rod and the oil pipe.Along with oil field rise of water cut, the intensification of pump extension and increasing of special track well, this problem becomes more and more serious.Secondly, too much transmission link and need overcome the weight of sucker rod own and elastic deformation will consume a part of power causes finally that oil pumper sucker rod pump system effectiveness reduces, maintenance workload strengthens, and has increased the crude oil production cost.

Summary of the invention

The objective of the invention is: the Rodless oil extraction system that provides a kind of underground rotation motor to drive, realize that downhole electrical motor drives oil well pump lifting crude oil.System compares with the oil pumper sucker rod pumping, has fundamentally eliminated the rod and tube partial-wear problem, has reduced transmission link, improves oil recovery efficiency.

The technical solution used in the present invention is: the Rodless oil extraction system that underground rotation motor drives, mainly form by pressure equaliser, phase asynchronous electric rotating machine, machinery conversion mechanism, following cylinder barrel and lower end cap.It is characterized in that: pressure equaliser comprises upper isolating ring, spiracle, dummy piston and last cylinder barrel, screw thread is arranged at last cylinder barrel top, can be connected with oil pipe, has spiracle on the upper cylinder half barrel, in last cylinder barrel dummy piston is arranged, dummy piston is enclosed within on the outer wall of motor shaft.The lower end of last cylinder barrel is fixed with phase asynchronous electric rotating machine, and there is axially extending bore at the motor shaft center of phase asynchronous electric rotating machine, and the motor shaft upper end extends to more than the upper isolating ring.Be fixed with cylinder barrel down in the lower end of phase asynchronous electric rotating machine, the lower end of following cylinder barrel is fixed with lower end cap.Machinery conversion mechanism is in following cylinder barrel, and machinery conversion mechanism comprises shaft coupling, nut and leading screw.The shaft coupling upper end is connected with the motor shaft lower end, and the shaft coupling lower end is connected with the nut upper end.Nut and leading screw adopt threaded engagement, and the lower end cap centre bore is passed in the lower end of leading screw.

In order to improve sealing, between leading screw and lower end cap, sealing ring is arranged.

Mutually asynchronouselectric rotating machine 5 is made up of end cap, motor housing, stator and rotor four parts, motor length overall 2.2m, motor housing external diameter 108mm, internal diameter 98mm.Stator is made up of stator core and stator winding, and stator core forms with the silicon steel plate stacking of 0.5mm, and the stator winding line is the circular copper wire of diameter 2.5mm.Rotor is made up of rotor core and rotor winding, rotor core forms with the silicon steel plate stacking of 0.5mm, and the rotor winding adopts the cage type winding, promptly inserts a copper sliver in each groove of rotor core, each couples together sliver with a copper ring copper sliver diameter 5.3mm at copper sliver two ends.During assembling with the end cap of phase asynchronouselectric rotating machine 5 with an end that is threaded in motor housing, in the motor housing of then stator being packed into, again rotor is inserted in the stator center hole, at last at the other end of motor housing with the end cap that is threaded.

The operating principle and the course of work of the Rodless oil extraction system that the summary underground rotation motor drives help understanding the present invention.

Consult Fig. 1.Pressure equaliser plays the effect of equilibrium pressure difference, guarantees the pressure balance that system is inside and outside.Phase asynchronouselectric rotating machine 5 rotatablely moves by the cable power supply generation at the middle part of system.Machinery conversion mechanism is converted to rotatablely moving ofmotor shaft 6 by thenut 8 that is connected withmotor shaft 6 linear reciprocating motion of leadingscrew 10 in thesystem bottom.Nut 8 is connected withshaft coupling 7 and rotates, and leadingscrew 10 is done straight reciprocatingmotion.Leading screw 10 is done the oil pump plunger piston reciprocating motion that straight reciprocating motion can drive the bottom, and the liquid pumping on stratum is come out.Leadingscrew 10 andmotor shaft 6 all design centre bore, and down-hole liquid can enter in the oil pipe of top by the centre bore of leadingscrew 10 andmotor shaft 6, arrives ground at last.

During up stroke, phase asynchronouselectric rotating machine 5 is rotated in the forward, and drivesnut 8 byshaft coupling 7 and is rotated in the forward, and leadingscrew 10 moves upward, and the oil pump plunger piston that leadingscrew 10 bottoms connect is up, and standing valve is opened, travelling valve cuts out, and finishes the suction process of oil well pump; During down stroke, phase asynchronouselectric rotating machine 5 reverse rotations drivenut 8 reverse rotations byshaft coupling 7, and leadingscrew 10 moves downward, and oil pump plunger piston is descending, and standing valve cuts out, travelling valve is opened, and finishes the discharge process of oil well pump.

Beneficial effect of the present invention: the Rodless oil extraction system that underground rotation motor of the present invention drives, electric rotating machine is placed the down-hole, by leading screw rotatablely moving of motor is converted to straight reciprocating motion, realize the lifting oil pumping thereby drive oil well pump.System compares with the oil pumper sucker rod pumping, has cancelled sucker rod, has fundamentally eliminated the side-abrasion of rod string problem; Realized " zero transmission " of motor shaft, eliminated loss of plunger stroke, helped improving oil well pump pump efficiency and system effectiveness to oil pump plunger piston; Use digital control scheme and adjust operational factor, reduced later stage operation expense and labor strength; Do not need oil pumper, well head floor space few.

Description of drawings

Fig. 1 is the Rodless oil extraction system structural profile schematic diagram that underground rotation motor of the present invention drives.

Among the figure, 1. upper isolating ring, 2. spiracle, 3. dummy piston is 4. gone up cylinder barrel, 5. phase asynchronous electric rotating machine, 6. motor shaft, 7. shaft coupling, 8.nut 9. descends cylinder barrel, 10. leading screw, 11. lower end caps, 12. sealing rings.

The specific embodiment

Embodiment 1: the Rodless oil extraction system that drives with the underground rotation motor of external diameter 108mm, a length 6.7m is an example, and the present invention is described in further detail.

Consult Fig. 1.The Rodless oil extraction system that underground rotation motor of the present invention drives mainly is made up of pressure equaliser, phase asynchronouselectric rotating machine 5, machinery conversion mechanism, followingcylinder barrel 9 andlower end cap 11.

Pressure equaliser comprises upper isolating ring 1,spiracle 2, dummy piston 3 andlast cylinder barrel 4, last cylinder barrel 1 external diameter 108mm, internal diameter 98mm, the external screw thread of M108 * 1.5 is arranged atlast cylinder barrel 4 tops, (end is the internal thread of M108 * 1.5 by a combination coupling, one end is the 27/8TBG internal thread) be connected with 27/8 plain end oil well pipe, have the spiracle of 2 diameter 10mm onlast cylinder barrel 4 walls, there is a dummy piston 3last cylinder barrel 4 inside, the endoporus of dummy piston 3 is 30mm, dummy piston 3 is enclosed within on the outer wall ofmotor shaft 6, dummy piston 3 tops are communicated with the oil jacket annular space with space between the upper isolating ring 1, dummy piston 3 bottoms and phase asynchronouselectric rotating machine 5 and machinery conversion mechanism internal communication, when phase asynchronous electricrotating machine 5 and machinery conversion mechanism internal pressure and annular pressure imbalance, dummy piston 3 motion automatically makes pressure reach balance.

Mutually asynchronouselectric rotating machine 5 is made up of end cap, motor housing, stator and rotor four parts, motor length overall 2.2m, motor housing external diameter 108mm, internal diameter 98mm.Stator is made up of stator core and stator winding, and stator core forms with the silicon steel plate stacking of 0.5mm, and the stator winding line is the circular copper wire of diameter 2.5mm.Rotor is made up of rotor core and rotor winding, rotor core forms with the silicon steel plate stacking of 0.5mm, and the rotor winding adopts the cage type winding, promptly inserts a copper sliver in each groove of rotor core, each couples together sliver with a copper ring copper sliver diameter 5.3mm at copper sliver two ends.During assembling with phase asynchronouselectric rotating machine 5 end caps with an end that is threaded in motor housing, in the motor housing of then stator being packed into, again rotor is inserted in the stator center hole, at last at the other end of motor housing with the end cap that is threaded.Those skilled in the art can finish design and make according to the structure of mutually asynchronous electric rotating machine 5.Provide the Electromagnetic Design parameter of phase asynchronouselectric rotating machine 5 below, offer those skilled in the art's reference.See Table 1, table 2.

The phase asynchronous electric rotating machine electromagnetic parameter design of table 1 table 1

The phase asynchronous electric rotating machine electromagnetic parameter design of table 2 table 2

Adopt the screw thread of M98 * 1.5 to be connected in the lower end oflast cylinder barrel 4 with a phase asynchronous electric rotating machine 5.Motor shaft 6 external diameters are that 30mm, length are 2955mm, and there is axially extending bore atmotor shaft 6 centers, and the aperture is 16mm.The lower end of phase asynchronous electricrotating machine 5 adopts the screw thread of M98 * 1.5 to be connected followingcylinder barrel 9 external diameter 108mm, internal diameter 98mm, length 3870mm with following cylinder barrel 9.The lower end of followingcylinder barrel 9 is fixed with lower end cap 11.Machinery conversion mechanism is in followingcylinder barrel 9, and machinery conversion mechanism comprisesshaft coupling 7,nut 8 and leading screw 10.Shaft coupling 7 upper ends and phase asynchronouselectric rotating machine 5 are fixing, and the top of lower end andnut 8 is fixed.Nut 8 adopts rectangular thread to cooperate pitch 10mm with leading screw 10.Nut 8 external diameter 75mm, length 400mm.Leadingscrew 10 nominal diameters are 50mm, length 1200mm, diameter of bore 16mm.Lower end cap 11 centre bores are passed in the lower end of leading screw 10.Between leadingscrew 10 andlower end cap 11, threeseals circle 12 is arranged.

Motor shaft 6 links together by thenut 8 ofshaft coupling 7 with machinery conversion mechanism, andnut 8 is done crankmotion under the drive ofmotor shaft 6, does linear reciprocating motion thereby drive leadingscrew 10.

There is external screw thread lower end atlower end cap 11, can be connected with the shell of bottom oil well pump; At the lower end of leadingscrew 11 external screw thread, can be connected with the plunger of bottom oil well pump.

Claims (3)

1. the Rodless oil extraction system that drives of a underground rotation motor, mainly by pressure equaliser, phase asynchronous electric rotating machine (5), machinery conversion mechanism, following cylinder barrel (9) and lower end cap (11) are formed, it is characterized in that: pressure equaliser comprises upper isolating ring (1), spiracle (2), dummy piston (3) and last cylinder barrel (4), screw thread is arranged at last cylinder barrel (4) top, have spiracle (2) on the upper cylinder half barrel, dummy piston (2) is arranged in last cylinder barrel (4), dummy piston (2) is enclosed within on the outer wall of motor shaft (6), the lower end of last cylinder barrel (4) is fixed with phase asynchronous electric rotating machine (5), there is axially extending bore at motor shaft (6) center of phase asynchronous electric rotating machine (5), the motor shaft upper end extends to more than the upper isolating ring, be fixed with cylinder barrel (9) down in the lower end of phase asynchronous electric rotating machine (5), the lower end of following cylinder barrel (9) is fixed with lower end cap (11), machinery conversion mechanism is in following cylinder barrel (9), machinery conversion mechanism comprises shaft coupling (7), nut (8) and leading screw (10), shaft coupling (7) upper end is connected with motor shaft (6) lower end, shaft coupling (7) lower end is connected with nut (8) upper end, nut (8) adopts threaded engagement with leading screw (10), and lower end cap (11) centre bore is passed in the lower end of leading screw (10).

2. the Rodless oil extraction system that underground rotation motor according to claim 1 drives is characterized in that: between leading screw (10) and lower end cap (11) sealing ring (12) is arranged.

3. the Rodless oil extraction system that underground rotation motor according to claim 1 and 2 drives, it is characterized in that: described phase asynchronous electric rotating machine 5 is made up of end cap, motor housing, stator and rotor four parts, motor length overall 2.2m, motor housing external diameter 108mm, internal diameter 98mm; Stator is made up of stator core and stator winding, and stator core forms with the silicon steel plate stacking of 0.5mm, and the stator winding line is the circular copper wire of diameter 2.5mm; Rotor is made up of rotor core and rotor winding, rotor core forms with the silicon steel plate stacking of 0.5mm, and the rotor winding adopts the cage type winding, promptly inserts a copper sliver in each groove of rotor core, each couples together sliver with a copper ring copper sliver diameter 5.3mm at copper sliver two ends; During assembling with the end cap of phase asynchronous electric rotating machine 5 with an end that is threaded in motor housing, in the motor housing of then stator being packed into, again rotor is inserted in the stator center hole, at last at the other end of motor housing with the end cap that is threaded.

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