CN111878408A

CN111878408A - Drilling fluid sand pump for oil exploitation and use method thereof

Info

Publication number: CN111878408A
Application number: CN202010808938.1A
Authority: CN
Inventors: 郑波
Original assignee: Guangzhou Shunchuang Technology Co Ltd
Current assignee: Guangzhou Shunchuang Technology Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-03

Abstract

The invention relates to the technical field of oil exploitation, and discloses an oil exploitation drilling fluid sand pump which comprises a bottom frame, a sealing assembly and an external motor, wherein a movable cavity is fixedly installed at the top of the bottom frame, a low-pressure inlet is formed in the left side of the back of the movable cavity, a high-pressure outlet is formed in the middle of the right side of the movable cavity, an impeller is movably sleeved in the middle of an inner cavity of the movable cavity, and a fixing frame is fixedly installed on the top surface of the movable cavity. Through the setting of wear-resisting rubber circle and extrusion piece, make when the rotational speed of impeller increases the pressure increase that makes the intracavity portion of moving, upwards extrude the extrusion piece, increase the contact force between wear-resisting rubber circle and extrusion piece and wear-resisting rubber circle and the main shaft, on the one hand along with the increase of rotational speed and pressure and then strengthen the leakproofness of moving intracavity portion, reduce the sand pump because of revealing the probability of failure who leads to, on the other hand provides the one deck protection for seal assembly, reduce the invasion of drilling fluid, increase seal assembly's life, reduce the maintenance cost.

Description

Drilling fluid sand pump for oil exploitation and use method thereof

Technical Field

The invention relates to the technical field of oil exploitation, in particular to a drilling fluid sand pump for oil exploitation and a using method thereof.

Background

The sand pump is one of the important devices in the drilling fluid solid phase control system, and the main function of the sand pump is to provide drilling fluid with certain pressure and discharge capacity for a drilling fluid desanding device, a mud remover and a rotational flow slurry mixer, at present, the sand pump used in a drilling site is a large-discharge centrifugal pump which is divided into a horizontal centrifugal pump and a vertical centrifugal pump, the working principle of the horizontal centrifugal pump is as shown in figure 6, the drilling fluid vertically enters an impeller 5 from a low-pressure inlet 3, an external motor drives a main shaft 7 to rotate to drive the impeller 5 to rotate to generate centrifugal force, the drilling fluid in the impeller 5 is discharged from a high-pressure outlet 4 at higher pressure, so that vacuum is generated in the center of the impeller 5, the drilling fluid entering from the low-pressure inlet 3 is sucked to generate conveying circulation, but the sand pump has some defects in the using process:

more than 85 percent of sand pumps used in a drilling site are horizontal sand pumps, more than 90 percent of failures of the horizontal sand pumps are caused by sealing, generally, the sealing forms of the sand pumps are mainly divided into two types, one type is a mechanical sealing device which is formed by a friction pair consisting of a pair or a plurality of pairs of moving rings and static rings and is used for filling soft packing in a packing box and applying certain pressure to enable the packing box to be filled with the packing, the other type is a mechanical sealing device which is formed by a pair or a plurality of pairs of moving rings and static rings, the mechanical sealing device is used for generating proper pressing force on the end surfaces of the rotating moving rings and the static rings by the pressure of an elastic element and a sealing medium so as to enable the moving rings and the static rings to be tightly attached, so that a layer of extremely thin liquid film is maintained to achieve the purpose of sealing, but the two types have the same problem in the use process, when the rotating speed of an impeller 5, the drilling fluid containing the silt enters the stuffing box, so that the shaft sleeve is seriously abraded, and meanwhile, once the drilling fluid containing the silt enters the sealing surface of the mechanical sealing device, the sealing pair is rapidly abraded and completely fails.

At present, centrifugal sand pump, its structure is impeller cantilever type support promptly the overhanging beam structure is the T style of calligraphy, and this kind of structure is when impeller 5 is rotatory, because the wear pad receives the corruption of drilling fluid and the inequality of wearing and tearing for the power that main shaft 7 rotation produced is inhomogeneous, produces slight vibration, and increases the load to bearing and sealing member, and has great amount of deflection, has accelerated the loss of bearing, makes sealed inefficacy, and then causes the leakage.

Disclosure of Invention

The invention provides a drilling fluid sand pump for oil exploitation and a using method thereof, which have the advantages of good drilling fluid conveying effect and good sealing effect and solve the problems in the background technology.

The invention provides the following technical scheme: a drilling fluid sand pump for oil exploitation comprises a bottom frame, a sealing component and an external motor, wherein a movable cavity is fixedly arranged at the top of the bottom frame, the left side of the back of the movable cavity is provided with a low-pressure inlet, the middle part of the right side of the movable cavity is provided with a high-pressure outlet, the middle part of the inner cavity of the movable cavity is movably sleeved with an impeller, the top surface of the movable cavity is fixedly provided with a fixed frame, the fixed frame is movably sleeved with the top of the impeller, a main shaft is movably sleeved in the fixed frame, the topmost end of the main shaft is fixedly connected with an external motor, the bottom end of the main shaft is fixedly sleeved with the top inner cavity of the impeller, the outer side of the top of the impeller and the inner part of the fixed frame are movably sleeved with the extrusion block, the top of the impeller is movably sleeved with a wear-resistant rubber ring outside the upper part of the extrusion block, and the main shaft is movably sleeved with a sealing assembly inside the fixing frame.

Preferably, the impeller comprises support plates and partition plates, the partition plates are eight and are uniformly distributed between the support plates, movable shaft cylinders are fixedly mounted on the upper surfaces of the support plates, and the partition plates uniformly divide the interiors of the support plates into eight spaces and are communicated with each other.

Preferably, the low pressure inlet and the movable cavity are in the same plane, and the direction of the low pressure inlet is the same as the tangential direction of the impeller.

Preferably, the movable shaft barrel is movably sleeved with a sand separation plate, the sand separation plate is fixedly connected with the top of the movable cavity, the sand separation plate is made of a hard steel plate, and fine holes are uniformly formed in the sand separation plate.

Preferably, the top of the wear-resistant rubber ring is provided with strip-shaped grooves which are uniformly distributed.

Preferably, a sealing rubber ring is fixedly mounted on the outer side of the extrusion block.

The use method of the drilling fluid sand pump for oil exploitation comprises the following specific steps:

s1: the external drilling fluid liquid storage pot of low pressure import, external motor drive main shaft rotates, and then drives the impeller and rotate, and the impeller rotation produces centrifugal force, will throw away the drilling fluid between the space bar that is close with the high-pressure outlet, produces the negative pressure after throwing away, attracts the drilling fluid in the opposite side space to supply, introduces the drilling fluid of low pressure import department simultaneously, supplies the vacancy.

S2: when the rotational speed of impeller increases the pressure increase that makes the activity intracavity portion, upwards extrudees the extrusion piece, and then for the wear-resisting rubber circle provides oblique ascending power for the contact force between wear-resisting rubber circle and the activity beam barrel increases, provides the protection for seal assembly, and increase one sealing measure, wear-resisting rubber circle provides reaction force to the extrusion piece simultaneously, makes its inseparable laminating with the inner wall of mount.

The invention has the following beneficial effects:

1. through the setting of wear-resisting rubber circle and extrusion piece, make when the rotational speed of impeller increases the pressure increase that makes the intracavity portion of moving, upwards extrude the extrusion piece, increase the contact force between wear-resisting rubber circle and extrusion piece and wear-resisting rubber circle and the main shaft, on the one hand along with the increase of rotational speed and pressure and then strengthen the leakproofness of moving intracavity portion, reduce the sand pump because of revealing the probability of failure who leads to, on the other hand provides the one deck protection for seal assembly, reduce the invasion of drilling fluid, increase seal assembly's life, reduce the maintenance cost.

2. The setting through the impeller, make the impeller form independent support through self and activity chamber, provide the bi-polar to support for the impeller, alleviate bearing load, improve bearing life, reduce the amount of deflection, reduce the running vibration that produces after the impeller is corroded and wearing and tearing, reduce the deviation with seal assembly complex, improve sealed effect, vertical placement through the main shaft simultaneously, make the inside drilling fluid of activity chamber receive gravity, reduce the volume that the drilling fluid rises and gets into seal assembly, and then reduce the calculation to seal assembly, and the direction through the low pressure import is the same with the tangential direction of impeller sets up, make the drilling fluid that drives the inside of activity chamber during the rotation of impeller carry out anticlockwise rotation, the drilling fluid gets into the impeller with tangential mode, reduce the impact between with the impeller, reduce the vibration of impeller, improve the operating efficiency, reduce consumption.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 taken at A-A in accordance with the present invention;

FIG. 3 is a schematic diagram of the working principle of the present invention;

FIG. 4 is a schematic view of the installation of the extrusion block and the wear-resistant rubber ring according to the present invention;

FIG. 5 is a schematic view of a structural impeller of the present invention;

fig. 6 is a schematic diagram of a conventional structure.

In the figure: 1. a chassis; 2. a movable cavity; 3. a low pressure inlet; 4. a high pressure outlet; 5. an impeller; 51. a support plate; 52. a partition plate; 53. a movable shaft cylinder; 6. a fixed mount; 7. a main shaft; 8. a wear-resistant rubber ring; 9. extruding the block; 10. a seal assembly; 11. a sand-isolation plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a drilling fluid sand pump for oil production comprises a base frame 1, seal assembly 10 and external motor, the top fixed mounting of chassis 1 has movable chamber 2, low pressure import 3 has been seted up on the back left side in movable chamber 2, high pressure outlet 4 has been seted up at the right side middle part in movable chamber 2, impeller 5 has been cup jointed in the activity of the inner chamber middle part in movable chamber 2, the top surface fixed mounting in movable chamber 2 has mount 6, mount 6 cup joints with impeller 5's top activity, main shaft 7 has been cup jointed in the activity in mount 6, main shaft 7's topmost and external motor fixed connection, the bottom of main shaft 7 cup joints with impeller 5's top inner chamber is fixed, impeller 5's the top outside and the inside activity that is located mount 6 have cup jointed extrusion piece 9, wear-resistant rubber circle 8 has been cup jointed in the top outside activity that impeller 5's top just is located extrusion piece 9, seal assembly 10 has been cup jointed in the inside activity that.

Wherein, impeller 5 includes backup pad 51 and space bar 52, space bar 52 has eight and evenly distributed between backup pad 51, the last fixed surface of backup pad 51 installs movable beam barrel 53, space bar 52 evenly divide into eight spaces and communicate each other with the inside of backup pad 51, when impeller 5 is rotatory, produce centrifugal force and throw away the drilling fluid in the space that is close with high-pressure outlet 4, and then produce the negative pressure, attract the drilling fluid in the space of opposite side, and supplement, movable beam barrel 53 provides the double-end support for impeller 5 simultaneously, alleviate bearing load, improve bearing life, reduce the amount of deflection, reduce the running vibration, reduce the deviation with seal assembly 10 complex, improve sealed effect.

Wherein, low pressure import 3 is in the coplanar with activity chamber 2, the direction of low pressure import 3 is the same with impeller 5's tangential direction, during impeller 5's rotation, drive the inside drilling fluid in activity chamber 2 and carry out anticlockwise rotation, and the drilling fluid that gets into from low pressure import 3 gets into along with impeller 5's tangential direction, on the one hand is brought into and is supplemented impeller 5's inside by impeller 5's revolving force, on the other hand reduces and impeller 5 between the impact, reduce impeller 5's vibration, improve the operating efficiency, reduce the consumption.

Wherein, the activity has cup jointed on the activity section of thick bamboo 53 and has separated sand board 11, separate sand board 11 and the top fixed connection in activity chamber 2, it has the stereoplasm steel sheet to make to separate sand board 11, separate evenly to have seted up the pore on the sand board 11, when the inside in activity chamber 2 is full of the drilling fluid, it permeates to the inside of mount 6 through separating sand board 11, separate sand board 11 and block the fine sand of drilling fluid, prevent that fine sand from getting into mount 6, cause main shaft 7, wear-resisting rubber circle 8 and seal assembly 10's wearing and tearing.

Wherein, evenly distributed's bar groove is seted up at wear-resisting rubber circle 8's top, and when extrusion piece 9 extrudeed wear-resisting rubber circle 8, wear-resisting rubber circle 8 draws close to this bar groove can provide sufficient space for wear-resisting rubber circle 8.

Wherein, the outside fixed mounting of extrusion piece 9 has the sealing rubber circle, when extrusion piece 9 received the ascending pressure of drilling fluid, provides the power of slant to wear-resisting rubber circle 8, receives the reaction force simultaneously, combines with the inner wall of mount 6, forms the sealed of great formation, prevents to have the drilling fluid to reveal from between mount 6 and the extrusion piece 9.

s1: the external drilling fluid liquid storage pot of low pressure import 3, external motor drive main shaft 7 rotates, and then drives impeller 5 and rotate, and impeller 5 is rotatory to produce centrifugal force, will throw away the drilling fluid between the space bar 52 that is close with high-pressure outlet 4, produces the negative pressure after throwing away, attracts the drilling fluid in the opposite side space to supply, introduces the drilling fluid of 3 departments of low pressure import simultaneously, supplies the vacancy.

S2: when impeller 5's rotational speed increase made the inside pressure increase in activity chamber 2, upwards extrude extrusion piece 9, and then for wear-resisting rubber circle 8 provides oblique ascending power for the contact force between wear-resisting rubber circle 8 and the activity beam barrel 53 increases, provides the protection for seal assembly 10, and increase a sealed measure, wear-resisting rubber circle 8 provides reaction force to extrusion piece 9 simultaneously, makes its inseparable laminating with the inner wall of mount 6.

The theory of operation, the external drilling fluid liquid storage pot of low pressure import 3, external motor drive main shaft 7 rotates, and then drives impeller 5 and rotate, and impeller 5 is rotatory to produce centrifugal force, throws away the drilling fluid between the space bar 52 that is close with high-pressure outlet 4, produces the negative pressure after throwing away, attracts the drilling fluid in the opposite side space to supply, introduces the drilling fluid of 3 departments of low pressure import simultaneously, supplies the vacancy.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an oil development drilling fluid sand pump, includes chassis (1), seal assembly (10) and external motor, its characterized in that: the top of the chassis (1) is fixedly provided with a movable cavity (2), the left side of the back of the movable cavity (2) is provided with a low-pressure inlet (3), the middle part of the right side of the movable cavity (2) is provided with a high-pressure outlet (4), the middle part of the inner cavity of the movable cavity (2) is movably sleeved with an impeller (5), the top surface of the movable cavity (2) is fixedly provided with a fixed frame (6), the fixed frame (6) is movably sleeved with the top of the impeller (5), a main shaft (7) is movably sleeved in the fixed frame (6), the top end of the main shaft (7) is fixedly connected with an external motor, the bottom end of the main shaft (7) is fixedly sleeved with the top inner cavity of the impeller (5), the outer side of the top of the impeller (5) is movably sleeved with an extrusion block (9) positioned in the fixed frame (6), the outer side of the top of the impeller (5) and positioned above the extrusion block (, and a sealing component (10) is movably sleeved on the main shaft (7) and positioned in the fixed frame (6).

2. The oil recovery drilling fluid sand pump of claim 1, wherein: the impeller (5) comprises support plates (51) and partition plates (52), eight partition plates (52) are uniformly distributed among the support plates (51), movable shaft barrels (53) are fixedly mounted on the upper surfaces of the support plates (51), and the partition plates (52) uniformly divide the interior of the support plates (51) into eight spaces and are communicated with each other.

3. The oil recovery drilling fluid sand pump of claim 1, wherein: the low-pressure inlet (3) and the movable cavity (2) are located on the same plane, and the direction of the low-pressure inlet (3) is the same as the tangential direction of the impeller (5).

4. The oil recovery drilling fluid sand pump of claim 2, wherein: the sand separating plate (11) is movably sleeved on the movable shaft barrel (53), the sand separating plate (11) is fixedly connected with the top of the movable cavity (2), the sand separating plate (11) is made of a hard steel plate, and fine holes are uniformly formed in the sand separating plate (11).

5. The oil recovery drilling fluid sand pump of claim 1, wherein: the top of the wear-resistant rubber ring (8) is provided with strip-shaped grooves which are uniformly distributed.

6. The oil recovery drilling fluid sand pump of claim 1, wherein: and a sealing rubber ring is fixedly arranged on the outer side of the extrusion block (9).

7. The use method of the oil exploitation drilling fluid sand pump as claimed in any one of claims 1 to 6, comprising the following specific steps:

s1: the external drilling fluid liquid storage pot of low pressure import (3), external motor drive main shaft (7) rotate, and then drive impeller (5) and rotate, and impeller (5) are rotatory to produce centrifugal force, will throw away the drilling fluid between space bar (52) that are close with high-pressure outlet (4), produce the negative pressure after throwing away, attract the drilling fluid in the opposite side space to the replenishment, introduce the drilling fluid of low pressure import (3) department simultaneously, replenish the vacancy.

S2: when the rotating speed of the impeller (5) is increased to increase the pressure in the movable cavity (2), the extrusion block (9) is extruded upwards, and then an oblique upward force is provided for the wear-resistant rubber ring (8), so that the contact force between the wear-resistant rubber ring (8) and the movable shaft barrel (53) is increased, a protection is provided for the sealing assembly (10), and a sealing measure is added, and meanwhile, the wear-resistant rubber ring (8) provides a reaction force for the extrusion block (9), so that the extrusion block is tightly attached to the inner wall of the fixing frame (6).