WO2009152652A1

WO2009152652A1 - A dual-plunger self-rotatable oil well pump

Info

Publication number: WO2009152652A1
Application number: PCT/CN2008/001667
Authority: WO
Inventors: 焦在魁; 鲁广立
Original assignee: Jiao Zaikui; Lu Guangli
Priority date: 2008-06-18
Filing date: 2008-09-27
Publication date: 2009-12-23

Abstract

A dual-plunger self-rotatable oil well pump comprises a plunger and two layers of pump barrel (16, 19) around the plunger. The plunger includes at least two plunger bodies (13), the two adjacent plunger bodies (13) are screwed together through a plunger connector (15). The upper and lower ends of the plunger are orderly connected with a thruster (20,10) and a centralizing mechanism respectively. The main pump barrel (19) is coupled to a barrel thruster (26) via an upper connector. The barrel thruster (26) is connected to a pump rod joint (31) via a rotating shaft assembly (28, 29, 30). The plunger may rotate only in fixed station and the main barrel (19) may run up and down while rotating, thus the pump drains the formation fluid.

Description

Double plunger rotary oil pump

The invention relates to a double plunger self-rotating oil pump. Background technique

At present, the international and domestic pumps for rod pumping wells are American-type plunger pumps, which are characterized in that the pumping unit pulls the sucker rod, and then the sucker rod pulls the plunger to reciprocate up and down in the pump cylinder, and the inside of the well The raw liquid is sucked up. The pump of this structure is currently dominant both at home and abroad. However, in the world, even in China, oil fields must be pumped after spraying.

The current common problems in pumping wells:

From the current statistics of Daqing, Shengli, Liaohe and other major oil fields: The problem that American oil pump can't solve is the partial grinding of the oil pipe caused by the bending of the sand card and the sucker rod, which makes the workover frequently frequent and increases. In view of this ubiquitous situation, the oil production research institutes of major oil fields and the relevant personnel of the technology research institutes of various oil refineries have spared no effort to solve this problem, but they have not been able to come up with A product that is ideal for solving problems. Summary of the invention

The object of the present invention is to provide a double plunger self-rotating oil pump with high pumping efficiency and good sand control effect. To achieve the above object, the present invention draws on the following design:

The utility model relates to a double plunger self-rotating oil pump, which comprises a pump barrel with a plunger and a jacket. The plunger has at least two sections, and the joints are screwed to each other through a plunger joint, and the upper end of the plunger is provided with The oil valve has a thruster respectively connected to the outer end of the plunger outlet valve and the lower end of the plunger, and the outer side of the upper and lower thrusters of the plunger has a centering mechanism;

The pump cylinder has two layers: the inner pump sleeve of the inner layer is sleeved on the outer side of the plunger, and the upper and lower joints of the pump cylinder and the centering mechanism of the main pump cylinder are provided at both ends, and the upper end of the main pump cylinder is covered with a full plunger and a thruster and a centering mechanism of the plunger, and the pump head thruster is continuously connected upward by a pump cylinder thruster, and the pump cylinder thruster is connected to the sucker rod joint of the external sucker rod via the rotating shaft component, in the pump cylinder The thruster has a built-in pump cylinder outlet valve coupling member; the outer outer pump cylinder sleeve is sleeved on the outer side of the main pump cylinder, and is respectively connected to the upper and lower ports of the inner main pump cylinder through the upper and lower pump cylinder joints, and the outer pump The sleeve includes a pump main thruster at the upper end of the main pump cylinder and the main pump cylinder, a rotating shaft component and a sucker rod joint; and a joint sleeve on the main pump cylinder seals the outer pump cylinder. The lower end of the plunger is connected to the thruster, and the lower end of the lower thruster is connected with a fixed valve assembly; the lower end of the outer pump cylinder is connected to the lower thruster outer tube of the plunger through the lower pump cylinder joint; the lower end is fixed by the tail pipe fixed valve The joint locks the fixed valve assembly and the lower thruster outer tube;

The centering beads are respectively provided with centering beads, and the centering beads are disposed at positions to allow the plunger to be placed so that only the centering point of the centering bead is in contact with the inner diameter of the main pumping cylinder in the pumping chamber.

The double-plunger self-rotating oil pump of the invention is mainly used for oily areas with thick oil, sand weight and sucker rod, which can improve oil pump efficiency and protect oil wells.

The advantages of the invention are:

1. The rotating operation of the pump cylinder and the plunger makes the liquid in the pump chamber and the plunger chamber oil pipe spiral, and the sand scale reduces the probability of accumulation and condensation, which can effectively prevent the sand card, the dirt card, and the pump extension. Service life, reduce the number of inspections, reduce the cost of oil, and increase the efficiency of the oil field.

2. The rotary operation of the pump cylinder resolves the downward and upward resistance of the raw liquid, reduces the load of the pumping unit, and achieves the purpose of energy saving. It also reduces the cost of oil in the oil field and creates benefits for the oil field.

3, high pump efficiency, can be increased by more than 8% than American pumps; long service life, one pump can be equivalent to the life of 2-3 American pumps;

4. Protecting the oil well can eliminate the disadvantages of the eccentricity of the sucker rod and reduce the cost of a large amount of operation.

5. Protecting the environment to reduce pollution, less work and no work, and good for environmental protection. DRAWINGS

Figure 1 is a schematic view of the structure of the present invention (a is the upper part, b is the lower part)

Figure 2 is a schematic view showing the structure of the plunger body of the present invention

Figure 3 is a schematic view showing the structure of the plunger joint of the present invention

Figure 4 is a schematic view of the structure of the plunger centering mechanism (a is the main view, b is the side view) Figure 5a is the schematic diagram of the upper plunger thruster

Figure 5b is a cross-sectional view of A-A in Figure 5a

Figure 6a is a schematic diagram of the structure of the lower plunger thruster

Figure 6b is a cross-sectional view of A-A in Figure 6a

7 is a schematic structural view of a centering mechanism of a plunger (a is a main view, and b is a side sectional view). As shown in Fig. 1, the double-plunger self-rotating oil pump of the present invention is composed of a plunger (13, 18) in the center layer and two pump cylinders (the outer pump cylinder 16 and the main pump cylinder 19) of the outer casing, and the main pump cylinder is equivalent. The plunger in the outer pump barrel is therefore referred to as a double plunger.

The plunger is at least two or more sections, and the sections are screwed together by a plunger joint. As shown in the figure, the plunger is formed by four sections (in two groups) in the embodiment. See Figure 2 for the structure of the plunger body 13, and the plunger joint 18 is shown in Figure 3. The two ports of the plunger body are internally threaded, the two ports of the plunger joint are externally threaded, and the middle section of the plunger joint and the two of the plunger are received. The port section forms a step, and the pipe diameter of the middle section is the same as that of the plunger body, and is sequentially connected in the order of a plunger body, a plunger joint, a plunger body and a plunger joint. In the butt joint, the nozzle end of the plunger body is spaced from the step of the plunger joint, and the plunger body centering mechanism 17 is disposed in the spacing section.

The plunger body centering mechanism can be seen as shown in FIG. 4, and is composed of a ring centering mechanism bracket 171 and a set of centering beads 172. The centering mechanism bracket has a set of ball pits corresponding to the number of centering beads. The centering beads are placed in it, and the two should be researched to ensure a certain degree of smoothness, so that the centering beads rotate smoothly; generally, a set of centering beads is selected to be 10, and 6 uniform distributions are preferred. In the overall assembly, the position of the centering bead can set the plunger body so that only the outer diameter point of the centering bead is in contact with the inner diameter of the main pump cylinder cavity in the pump chamber.

The upper and lower ends of the integral plunger are respectively coupled with plunger upper and lower thrusters 20, 10. The structure of the upper thruster 20 can be seen in Figures 5a and 5b, wherein the lower end is a joint pipe 201 for connecting with the plunger, and the central shaft 203 of the upper end is used for realizing the connection with the rotating shaft of the upper end member, the main functional component 202 It is a propeller with a rotating blade. In this embodiment, the right hand is used, and the right hand is raised at an angle of 30 °. The structure of the lower thruster 10 can be seen in Figures 6a and 6b. The principle of construction is similar to that of the upper thruster. The main functional component 102 is also a propeller having a rotating blade. In this embodiment, the right-handed, right-handed angle 30 is used. ° .

As shown in Fig. 1, an oil discharge valve 21 is disposed in the inner cavity of the joint pipe where the upper end of the plunger is connected to the upper thruster 20. On the outer side of the upper and lower plunger thrusters 20, 10 respectively, there are a plunger upper and lower center centering mechanism 11, and the upper and lower end centering mechanisms 11 of the plunger can use the same mechanism, see Fig. 7, by a ring centering The mechanism bracket 111 is combined with a set of centering beads U2. The centering mechanism bracket is provided with a set of ball pits corresponding to the number of centering beads. A slot 113 can be formed between the ball holes, and the centering beads are disposed therein. The response should be studied, and one group can be three. A plunger centering mechanism pressure cap is attached to the upper side of the centering mechanism. At the lower end of the plunger lower thruster is connected a fixed valve assembly 5, which is driven by a set of bearing units, the bearing unit comprising: a needle bearing 7, a thrust bearing 8 and a limiting shaft 9. The inner main pump cylinder 19 is sleeved on the outer side of the plunger, and has two upper and lower joints of the pump cylinder and a centering mechanism 25 at both ends. The upper end of the centering mechanism is covered with a pressure cap 24; the main pump cylinder centering mechanism 25 Similar to the plunger centering mechanism.

The upper end of the main pump cylinder includes a thruster and a centering mechanism of the full plunger and the plunger, and the pump cylinder thruster 26 is continuously connected upward by the joint on the pump cylinder. The pump cylinder thruster 26 passes through the rotating shaft 28 and the like. (The combined needle bearing 29 and the bearing sleeve 30 are also connected to the sucker rod joint 31 of the external sucker rod, and the pump outlet valve member 27 is built in the pump thruster 26.

The outer pump cylinder 16 of the outer layer is sleeved on the outer side of the main pump cylinder, and the upper and lower joints of the main pump cylinder of the inner layer are respectively sleeved through the upper and lower joints of the pump cylinder, and the outer pump cylinder 16 contains the whole main pump cylinder 19 And the pump cylinder thruster 26 at the upper end of the main pump cylinder, the rotating shaft component and the sucker rod joint 31; the outer pump cylinder upper joint 32 sets the outer pump cylinder; the outer pump cylinder lower end passes the outer pump cylinder lower joint and the plunger The lower thruster outer tube is connected; the lower end is fixed by the tail pipe fixed valve joint 1 to fix the fixed valve assembly and the lower thruster outer tube 6. The fixed valve can be configured in the same manner as the fixed valve of the American pump, and adopts a full ball type free fall.

The above-described embodiments are susceptible to variations in the scope of the invention, and the invention is intended to be illustrative and not to limit the scope of the invention.

The working principle of the double plunger self-rotating oil pump of the invention:

The plunger rotates left to the left (the plunger can rotate because there is a bearing-like centering bead between the joints and the internodes of the plunger. The purpose of the centering bead is to put the plunger up so that the plunger is in the pump chamber. Only the outer diameter point of the centering bead is in contact with the inner diameter of the main pump cylinder, so that the outer diameter of the main pump cylinder cavity and the plunger has no friction, only the liquid flow and the plunger have frictional force. Thus the friction between the pump cavity and the plunger Very small, allowing the plunger to rotate smoothly).

The upper and lower ends of the plunger have a right-handed thruster, which rotates to the left under the impact of the liquid flow. The bottom end of the plunger has a fixed valve fixed by two special bearings (needle bearing 7, thrust bearing 8), so The flow can be freely rotated under the impact of the flow.

Under the action of the sucker rod, the main pump cylinder is driven up and down by the pump thruster. The upper and lower ends of the main pump cylinder have pump thrusters, which rotate to the right under the impact of the liquid flow. The outer diameter of the centering bead on the upper and lower ends is in point contact with the outer pump cylinder, and the inner diameter is in point contact with the centering position of the main pump cylinder. In this way, the operation can be smoothly rotated under the impact of the liquid flow, and the upper and lower operations are operated in the direction of the screw tightening.

The invention is actually a double plunger self-rotating oil pump. There is an in-place rotating plunger and a plunger that rotates up (referring to the main pump barrel). The invention changes the structure, operation mode and operation characteristics of the current American oil pump. First, the American oil pump is a plunger that runs up and down in the pump cylinder and runs the pumping oil. The liquid valve is mounted on the pump cylinder, and the plunger of the double plunger self-rotating oil pump of the present invention rotates only in the original position, the pump cylinder rotates up and down, the stock solution is pumped, and the fixed valve is installed in the lower thruster of the plunger. Lower end.

The American oil pump is to pull the plunger by the sucker rod, and the double plunger self-rotating oil pump of the present invention is the sucker rod to pull the pump barrel.

The working process of the double plunger self-rotating oil pump of the invention: when the pumping unit is started, the sucker rod pulls the main pump cylinder 19 upward, the fixed valve coupler 5 opens the thruster 10 of the lower end of the plunger, pushes the plunger to rotate, rotates The direction is left-handed, the plunger is left-handed until the oil outlet pushes the outlet valve ball of the oil outlet valve member 27 into the pump chamber. At this time, the plunger rotates to drive the centering bead of the plunger outer diameter, and the centering force of the plunger is transmitted to The inner diameter of the pump cylinder, due to the conduction of force, the pump cylinder starts to rotate, the rotation direction of the plunger is left-handed, and the centering bead is rotated rightward. Since the centering bead rotates in the pump cylinder, the pump cylinder is also rotated rightward, so that the thread is tightened. When the raw liquid enters the pump cylinder through the oil discharge valve end, there are two cases. When the pump cylinder is ascending, the fixed valve at the lower end of the plunger is opened, and the raw liquid enters the plunger chamber to push the thruster at the lower end of the plunger, and then pushes the plunger to rotate. The original liquid continues to rise, pushing the oil valve into the pump chamber. At this time, the thruster at the upper end of the plunger pushes the plunger to rotate under the push of the raw liquid entering the pump cavity. The plunger rotates to rotate the centering bead at both ends of the plunger. The direction of rotation: the plunger rotates left to the left, the centering bead Turn right, the force of the pump makes the pump cylinder turn right, so that the pump cylinder rotates upward (constant speed), the pump cylinder runs to the top dead center and starts to descend. At this time, the fixed valve is closed, the upper and lower oil outlet valves of the plunger are closed, the oil inlet pipe and the oil inlet pipe are closed. The raw liquid in the pump chamber only pushes the oil discharge valve on the pump cylinder from the oil outlet of the pump cylinder into the oil pipe. When the pump cylinder thruster 26 at the upper end of the pump cylinder is under the impact of the liquid flow, the rotary motion drives the pump cylinder to rotate. The rotation of the pump cylinder drives the centering bead which is in contact with the inner wall of the pump cylinder and the inner wall of the pump cylinder. The rotation of the force also starts to rotate, which in turn drives the plunger to rotate. It rotates continuously according to the original left-hand rotation direction. When the pump cylinder runs to the bottom dead center. When the vehicle is ascending, the fixed valve is opened and the previous operation is repeated. Therefore, the double-plunger self-rotating oil pump of the present invention can rotate to pump the crude oil.

Claims

Claim

A double-plunger self-rotating oil pump comprising a pump barrel having a plunger and a jacket, wherein: the plunger is at least two or more sections, and the sections are screwed together by a plunger joint, The upper and lower ends of the integral plunger are respectively connected with the plunger upper and lower thrusters; an oil outlet valve is arranged in the inner end of the upper end of the plunger and the upper thruster joint tube, and the outer side of the upper and lower plunger thrusters is centered Institution

The pump cylinder is in two layers:

The inner pump sleeve of the inner layer is sleeved on the outer side of the plunger, and the upper and lower joints of the pump cylinder and the centering mechanism of the main pump cylinder are provided at both ends, and the upper end of the main pump cylinder is covered with a full plunger and a plunger thruster and a centering mechanism And a pump thruster is continuously connected upward by the joint on the pump cylinder, and the pump thruster is connected with the sucker rod joint of the external sucker rod via the rotating shaft component, and the oil pump valve fitting is built in the pump thruster ;

The outer pump sleeve of the outer layer is sleeved on the outer side of the main pump cylinder, and is respectively sleeved with the upper and lower ports of the main pump cylinder of the inner layer through the upper and lower pump cylinder joints, and the outer pump cylinder sleeve includes the main main pump cylinder and the main pump. a pump cylinder thruster at the upper end of the cylinder, a rotating shaft member and a sucker rod joint; an outer pump cylinder upper sleeve seals the outer pump cylinder;

The lower end of the plunger is connected to the thruster, and the lower end of the lower thruster is connected with a fixed valve assembly; the lower end of the outer pump cylinder is connected to the lower thruster outer tube of the plunger through the lower pump cylinder joint; the lower end is fixed by the tail pipe fixed valve The joint locks the fixed valve assembly and the lower thruster outer tube;

A plunger body centering mechanism is disposed between the plungers.

2. The double-plunger self-rotating oil pump according to claim 1, wherein: the plunger body has internal threads on both ports, and the two ports of the plunger joint are externally threaded, and the middle of the plunger body The two port sections of the segment and the adduct form a step, and the pipe diameter of the middle section of the plunger joint is the same as the pipe diameter of the plunger body.

3. The double-plunger spin-rotating oil pump according to claim 1, wherein: the plug body centering mechanism is composed of a ring-shaped centering mechanism bracket and a built-in set of balls.

4. The double-plunger self-rotating oil pump according to claim 3, wherein: the centering bead of the centering mechanism has a size and a position such that the plunger body can be erected and only in the pump chamber The outer diameter of the bead is in contact with the inner diameter of the main pump barrel.

The double-plunger self-rotating oil pump according to claim 3, wherein: the set of centering beads is 3 to 10.

6. The double-plunger spin-rotating oil pump according to claim 5, wherein: said set of centering beads is six and evenly distributed.