CN103147729A - Mechanical mixing and dosing pipe string under pump of oil well pump - Google Patents

Abstract

The invention discloses a mechanical mixing and blending pipe column under an oil well pump, which comprises an oil pipe, a hollow sucker rod, an oil well pump sealing disconnecting device, an oil well pump, a rotary connecting device and a mechanical mixer under the pump, wherein the hollow sucker rod is arranged inside the oil pipe, the lower end of the hollow sucker rod is connected with a plunger of the oil well pump through the oil well pump sealing disconnecting device, and the rotary connecting device and the mechanical mixer under the pump are sequentially connected below the plunger of the oil well pump. The under-pump mechanical mixer includes: the outer pipe is internally provided with a rack in an axial direction; the gears are respectively meshed with the racks, each gear is connected to a connecting rod in a penetrating mode, and two ends of each connecting rod are rotatably connected to the inner side wall of the outer pipe; and the impellers are connected to the connecting rod and positioned on two sides of the gear. The invention fully exerts the emulsification and viscosity reduction effects of the viscosity reducer and greatly improves the exploitation effect of thick oil.

Description

Mechanical mixing and dosing pipe string under pump of oil well pump

technical field

The invention relates to a mechanical mixing and dosing pipe string under the pump of an oil well pump, which is mainly aimed at chemical viscosity-reducing production of oil wells with dosing.

Background technique

Heavy oil reserves are relatively abundant in my country's oil fields, but due to its high colloid and bitumen content and poor fluidity, it is difficult to exploit. Usually, heavy oil is exploited by mixing thin oil for viscosity reduction, hollow rod electric heating, and chemical agent for viscosity reduction. The effect of chemical agent emulsification and viscosity reduction depends on the degree of full and uniform mixing of chemical agent and heavy oil in the downhole.

The existing process of mixing thin oil in the casing annulus is based on the principle of similar miscibility, which generally reduces the viscosity of the mixed liquid, but naturally mixes with heavy oil by gravity. Usually, only by increasing the oil mixing ratio can normal production be satisfied. To a certain extent Caused the waste of thin oil resource.

In order to achieve an ideal mixing effect for existing mixers that depend on the velocity of the downhole fluid flow, the downhole fluid flow must reach a certain speed, and the downhole fluid supply must be sufficient, which limits the application. Most of the existing mechanical mixers have complex structures and high processing costs.

Contents of the invention

The purpose of the present invention is to provide a mechanical mixing and doping pipe string under the oil well pump, which uses the function of the sucker rod to move up and down to fully mix the chemical viscosity reducer and crude oil and lift it to the ground smoothly.

Above-mentioned purpose of the present invention can adopt following technical scheme to realize:

A mechanical mixing and dosing pipe string under the pump of an oil pump, the pipe string includes an oil pipe, a hollow sucker rod, a seal disconnector of the oil pump, an oil pump, a rotary connection device and a mechanical mixer under the pump, and the hollow oil pump The rod is arranged inside the oil pipe, and the lower end of the hollow sucker rod is connected to the plunger of the oil pump through the seal disconnector of the oil well pump, and the lower end of the plunger of the oil well pump is connected to the rotary connection device and the pump in turn. The lower mechanical mixer; the mechanical mixer under the pump includes: an outer tube with a rack pierced in the axial direction; a plurality of gears respectively meshing with the racks, each of which is threaded and connected to a connecting rod Above, both ends of the connecting rod are rotatably connected to the inner side wall of the outer tube; a plurality of impellers are connected to the connecting rod, and the plurality of impellers are located on both sides of the gear.

In the mechanical mixing and dosing column of the oil well pump described above, positioning holes are respectively opened on the opposite sides of the outer pipe, and pins are provided in the positioning holes, and the pins penetrate into the top of one end of the positioning holes. against the rack.

As mentioned above, the mechanical mixing and dosing pipe string under the pump of the oil well pump, the seal disconnector of the oil well pump includes: a spring claw, which is connected to the above-mentioned hollow sucker rod, and the inner wall of the spring claw is smooth; a core rod, whose The upper end is detachably connected to the inside of the spring claw, the lower end of the core rod is provided with a nut for adjusting the elastic deformation of the spring, the lower end of the core rod is connected to the plunger of the above-mentioned oil well pump, and the upper end of the core rod The outer wall is provided with a mounting hole, and a sealing ring is provided in the mounting hole; a sliding sleeve is clamped on the outside of the middle part of the core rod, and a detachable sliding sleeve is provided outside the lower end of the spring claw; a spring is sleeved on the core rod outside of the lower end of the spring, and the two ends of the spring respectively bear against the sliding sleeve and the nut.

As described above, the mechanical mixing and dosing pipe string under the pump of the oil well pump, the rotating connection device includes: a rotating outer pipe, which has an outer pipe main body, and the lower end of the outer pipe main body is provided with an outer pipe protrusion inwardly. A connecting hole is provided on the protrusion of the outer tube, and the upper end of the main body of the outer tube has an upper joint, and the upper joint is connected to the plunger of the oil pump, the rotating outer tube rotates with the plunger, and the outer tube protrudes The bottom of the block is provided with a limit nut; the inner tube has an inner tube main body, and the upper end of the inner tube main body is provided with an inner tube convex body, and the inner tube convex body is connected to the inside of the outer tube main body, and the Graphite packing is arranged between the convex body of the inner pipe and the main body of the outer pipe, the lower end of the main body of the inner pipe passes through the connecting hole, the lower end of the main body of the inner pipe has a lower joint, and the lower joint is connected to the mechanical pump under the pump. The rack of the mixer; the bearing, which is connected between the main body of the inner tube and the main body of the outer tube, and is located between the protrusion of the outer tube and the protrusion of the inner tube.

The characteristics and advantages of the mechanical mixing and doping pipe string under the pump of the present invention are: it fully exerts the emulsification and viscosity-reducing effect of the viscosity-reducing agent, greatly improves the production effect of heavy oil, and effectively improves the production of the oil well. Its structure is simple, The cost is low, economical and durable, and can meet the mixing and stirring requirements of on-site drug mixing and viscosity reduction.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the schematic structural view of the mechanical mixing and dosing pipe string under the pump of the oil well pump according to the embodiment of the present invention;

2 is a schematic diagram of an under-pump mechanical mixer of an under-pump mechanical mixing dosing column of an oil well pump according to an embodiment of the present invention;

2A is an enlarged schematic cross-sectional view of an under-pump mechanical mixer of an under-pump mechanical mixing dosing column of an oil well pump according to an embodiment of the present invention;

Fig. 3 is a half-sectional schematic diagram of the oil well pump seal disconnector of the mechanically mixed dosing pipe string under the oil well pump according to the embodiment of the present invention;

Fig. 4 is a half-sectional schematic diagram of the rotary connection device of the mechanical mixing dosing column under the pump of the oil well pump according to the embodiment of the present invention.

Explanation of some reference signs:

T Casing Y Reservoir D Artificial Bottom

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, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Fig. 1 to Fig. 4, the present invention proposes a kind of mechanical mixing doping pipe string under the pump of the oil well pump, which includes the oil pipe 1, the hollow sucker rod 2, the seal disconnector 3 of the oil well pump, the oil well pump 4, the rotary The connection device 5 and the mechanical mixer 6 under the pump, the hollow sucker rod 2 is arranged inside the oil pipe 1, and the lower end of the hollow sucker rod 2 passes through the column of the oil pump seal disconnector 3 and the oil pump 4 The plunger of the oil well pump 4 is connected with the rotary connection device 5 and the mechanical mixer 6 under the pump in turn. The under-pump mechanical mixer 6 includes an outer tube 6a, a plurality of gears 6b and a plurality of impellers 6c. A rack 6d is axially pierced inside the outer tube 6a; a plurality of gears 6c are meshed with the racks 6d respectively, and each of the gears 6b is pierced and connected to a connecting rod 6e, and two of the connecting rods 6e The end is rotatably connected to the inner side wall of the outer tube 6a; multiple impellers 6c are connected to the connecting rod 6e, and multiple impellers 6c are located on both sides of the gear 6b.

The two ends of the connecting rod 6e are rotatably connected to the opposite inner wall of the outer tube 6a through bearings, and the gear 6b, the connecting rod 6e and the impeller 6c are fixedly connected. When the gear 6b rotates, the connecting rod 6e and the impeller 6c are also connected. Turn accordingly. Wherein, each connecting rod 6e is connected with a gear 6b and two impellers 6c, and the two impellers 6c are respectively located on both sides of the gear 6b.

As shown in FIG. 2A, positioning holes 6f are respectively opened on opposite sides of the outer tube 6a, and a pin is provided in the positioning hole 6f, and one end of the pin penetrating into the positioning hole 6f abuts against the teeth. Article 6d on. Here, the positioning holes 6f are provided on the inner side walls of the outer tube 6a on the front and rear sides of the rack 6d, and the axes of the two positioning holes 6f are aligned with the line connecting the gears 6b on the left and right sides of the rack 6d. Vertically, pins are inserted in the positioning hole 6f so that the front and rear sides of the rack 6d can be positioned by the pins to ensure that the rack 6d is axially centered.

When this embodiment is in use, the above-mentioned mechanical mixer 6 under the pump and the rotary connection device 5 are connected below the oil well pump 4, and they are lowered into the well with the pump pipe to the designed depth; then the oil well pump seal disconnector 3 It is connected with the hollow sucker rod 2, and is lowered into the specified depth in the well in the pump pipe, and is smoothly connected with the plunger of the oil pump 4 by means of the oil pump seal disconnector 3. When the surface viscosity reducer is injected into the bottom of the oil well from the hollow sucker rod 2 through the oil pump seal disconnector 3, the plunger of the oil pump 4, the rotary connection device 5, and the mechanical mixer 6 under the pump, it passes through the pump together with the formation fluid. Lower mechanical mixer 6.

Because the hollow sucker rod 2 drives the plunger of the oil pump 4 and the rack 6d to move up and down axially, and because the rack 6d meshes with the gear 6c, the up and down movement of the rack 6d drives the gear 6c to rotate, and then drives the connecting rod 6e Rotate, the impeller 6c connected on the connecting rod 6e also rotates axially under the rotating action of the connecting rod 6e. The rotation of multiple impellers 6c will drive the downhole fluid flow to rotate at a high speed, so that the chemical viscosity reducer and heavy oil are fully mixed, and the fully mixed mixed fluid is smoothly lifted to the ground through the hollow sucker rod 2 .

The pipe string in this embodiment fully exerts the emulsification and viscosity-reducing effect of the viscosity-reducing agent, greatly improves the production effect of heavy oil, and effectively increases the production of oil wells. Requirements for mixing and stirring.

As shown in FIG. 3 , according to an embodiment of the present invention, the oil well pump seal disconnector 3 includes a spring claw 3a, a core rod 3b, a sliding sleeve 3c and a spring 3d. The spring claw 3a is connected to the above-mentioned hollow sucker rod 2, and the inner wall of the spring claw 3a is smooth; A mounting hole is opened, and a sealing ring 3e is arranged in the mounting hole. A nut 3f is connected to the lower end of the core rod 3b for adjusting the elastic deformation of the spring 3d. The core rod 3b is connected to the column of the above-mentioned oil well pump 4 plug; the sliding sleeve 3c is clamped on the outside of the middle part of the core rod 3b, and is detachably slidably sleeved on the outside of the lower end of the spring claw 3a; the spring 3d is sleeved on the outside of the lower end of the core rod 3b, and the spring 3d The two ends bear against the sliding sleeve 3c and the nut 3f respectively.

In this embodiment, during the actual downhole operation, the spring 3d is in a loose state through the nut 3f first, and the spring claw 3a is separated from the core rod 3b; the core rod 3b is tightened on the plunger of the oil well pump 4, and the core rod 3b is lowered into the bottom of the well together with the plunger of the oil well pump 4, and the plunger is put into the oil well pump 4; then the upper end of the spring claw 3a is screwed on the hollow sucker rod 2, and the core rod 3b and the hollow sucker rod 2 Going down to the bottom of the well together, due to the setting of the sliding sleeve 3c, the initial slightly outwardly expanded state of the spring claw 3a is contracted, so that the spring claw 3a and the core rod 3b are well connected together, and the spring claw 3a and the core rod 3b After the docking is successful, the oil well pump seal disconnector 3 is in the working state at this time. In the next operation, just lift the hollow sucker rod 2 up, and when it passes through the reduced diameter of the pump tube, the sliding sleeve 3c and the spring claw 3a will be displaced relative to each other, so that the spring claw 3a will be detached from the sliding sleeve 3c and pumped out. The oil pump seal disconnector 3 is automatically disconnected.

As shown in FIG. 4 , according to an embodiment of the present invention, the rotating connection device 5 includes a rotating outer tube 5 a, an inner tube 5 b and a bearing 5 c. The rotating outer tube 5a has an outer tube main body 5a1, the lower end of the outer tube main body 5a is provided with an outer tube bump 5a2 inwardly, the outer tube bump 5a2 is provided with a connecting hole 5a3, and the outer tube bump 5a2 There is a limit nut 5a5 below the outer tube body 5a, the upper end of the outer tube main body 5a has an upper joint 5a4, and the upper joint 5a4 is connected to the plunger of the oil well pump 4, and the rotating outer tube 5a rotates together with the plunger; The inner tube 5b has an inner tube main body 5b1, the upper end of the inner tube main body 5b1 is provided with an inner tube convex body 5b2, and the inner tube convex body 5b2 is connected to the inside of the outer tube main body 5b1, and the inner tube convex body 5b2 and the outer pipe main body 5a1 are provided with graphite packing 5d, the lower end of the inner pipe main body 5b1 has a lower joint 5b3, and the lower joint 5b3 is connected to the rack 6d of the mechanical mixer 6 under the pump; the bearing 5c It is connected between the inner tube main body 5b1 and the outer tube main body 5a1, and is located between the outer tube protrusion 5a2 and the inner tube protrusion 5b2.

In this embodiment, when the rotating outer tube 5a rotates slightly together with the plunger, the inner tube 5b is relatively fixed relative to the rotating outer tube 5a, that is, the inner tube 5b does not rotate with the rotating outer tube 5a. When the plunger of the oil well pump 4 moves up and down with the hollow sucker rod 2, the rotating outer tube 5a, inner tube 5b and rack 6d also move up and down, and then drive the impeller 6c to rotate.

The embodiment of the present invention makes the mixing of the viscosity reducer and the heavy oil at the bottom of the well easier, more sufficient, and low in cost, and fully utilizes the kinetic energy of the hollow sucker rod 2 moving up and down to convert the kinetic energy into the pumping machinery. The kinetic energy of the impeller in the mixer 6 forms a powerful dynamic field under the pump, which makes the viscosity reducer and the heavy oil at the bottom of the well mix more evenly, fully exerts the effect of the viscosity reducer, reduces the viscosity of the heavy oil, and smoothly mixes the thick oil Oil viscosity-reduced lift to surface.

The above descriptions are only a few embodiments of the present invention, and those skilled in the art can make various changes, modifications or combinations to the embodiments of the present invention according to the disclosure of the application documents without departing from the spirit and scope of the present invention.

Claims (4)

1. A mechanical mixing and dosing pipe string under the pump of an oil well pump, characterized in that the pipe string includes an oil pipe, a hollow sucker rod, a seal disconnector of the oil well pump, an oil well pump, a rotary connection device and a mechanical mixer under the pump , the hollow sucker rod is arranged inside the oil pipe, the lower end of the hollow sucker rod is connected with the plunger of the oil well pump through the seal disconnector of the oil well pump, and the lower end of the plunger of the oil well pump is connected with all The above-mentioned rotary connection device and the mechanical mixer under the pump; The under-pump mechanical mixer includes: The outer tube is axially pierced with a rack; A plurality of gears are respectively meshed with racks, each of the gears is connected to a connecting rod, and the two ends of the connecting rod are rotatably connected to the inner wall of the outer tube; A plurality of impellers are connected on the connecting rod, and the plurality of impellers are located on both sides of the gear. 2. The under-pump mechanical mixing and doping pipe string of the oil well pump according to claim 1, characterized in that, positioning holes are respectively opened on opposite sides of the outer pipe, and pins are arranged in the positioning holes, and the pins One end passing through the positioning hole abuts against the rack. 3. The under-pump mechanical mixing and dosing pipe string of the oil well pump according to claim 1, wherein the oil well pump seal disconnector comprises: A spring claw, which is connected to the above-mentioned hollow sucker rod, and the inner wall of the spring claw is smooth; The core rod, the upper end of which is detachably connected to the inside of the spring claw, the lower end of the core rod is provided with a nut for adjusting the elastic deformation of the spring, the lower end of the core rod is connected to the plunger of the above-mentioned oil well pump, the The outer wall of the upper end of the core rod is provided with a mounting hole, and a sealing ring is arranged in the mounting hole; a sliding sleeve, which is clamped on the outside of the middle part of the core rod, and a detachable sliding sleeve is arranged on the outside of the lower end of the spring claw; The spring is sheathed outside the lower end of the core rod, and the two ends of the spring respectively bear against the sliding sleeve and the nut. 4. The mechanically mixed dosing string under the pump of the oil well pump according to claim 1, wherein the rotating connection device comprises: Rotating outer tube, which has an outer tube main body, the lower end of the outer tube main body is provided with an outer tube bump inwardly, the outer tube bump is provided with a connecting hole, and the upper end of the outer tube main body has an upper joint, so The above joint is connected to the plunger of the oil well pump, the rotating outer tube rotates with the plunger, and a limit nut is provided under the protrusion of the outer tube; An inner tube, which has an inner tube body, the upper end of the inner tube body is provided with an inner tube protrusion, and the inner tube protrusion is connected to the inside of the outer tube body, and the inner tube protrusion is connected to the outer tube body Graphite packing is arranged between, the lower end of the inner pipe main body passes through the connecting hole, the lower end of the inner pipe main body has a lower joint, and the lower joint is connected to the rack of the mechanical mixer under the pump; The bearing is connected between the main body of the inner pipe and the main body of the outer pipe, and is located between the protrusion of the outer pipe and the protrusion of the inner pipe.

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