CN113153251B

CN113153251B - Rotary shearing type polymer viscosity reduction device

Info

Publication number: CN113153251B
Application number: CN202110168797.6A
Authority: CN
Inventors: 张辉; 周莹; 张云松; 史敬东; 王乐园
Original assignee: SHENGLI OILFIELD RODLESS PUMP Inc
Current assignee: SHENGLI OILFIELD RODLESS PUMP Inc
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2023-06-27
Anticipated expiration: 2041-02-07
Also published as: CN113153251A

Abstract

The invention relates to a rotary shearing type polymer viscosity reducing device which comprises a shell, wherein the top of the shell is connected with a first connecting part, the bottom of the shell is connected with a second connecting part, the first connecting part and the second connecting part are respectively used for being connected with a centrifugal pump and a protector, a transmission shaft is further arranged on the inner periphery of the shell, the top and the bottom of the transmission shaft are respectively connected with a shaft part of the centrifugal pump and a shaft part of the protector, a plurality of first liquid inlets are arranged on the shell, a plurality of shearing units are connected on the outer periphery of the transmission shaft, and the shearing units are arranged along the axial direction of the transmission shaft; the shearing unit comprises a connecting sleeve which is non-rotatably connected with the transmission shaft, and a plurality of shearing blades which are arranged on the periphery of the connecting sleeve and are arranged along the circumferential direction of the transmission shaft. According to the invention, the shearing unit is arranged on the transmission shaft, and the polymer in the well fluid can be sheared and reduced in viscosity when the circumference of the shearing blade rotates at a high speed, so that the viscosity of the well fluid containing the polymer is reduced, and the coagulation of the well fluid is avoided.

Description

Rotary shearing type polymer viscosity reduction device

Technical Field

The invention relates to the technical field of polymer flooding mechanical oil extraction, in particular to a rotary shearing type polymer viscosity reduction device.

Background

Polymer flooding is a method for increasing the viscosity of injected water, reducing the water-oil flow rate ratio, expanding the swept volume of the injected water in an oil layer and improving the recovery ratio of crude oil. When the polymer aqueous solution is injected into an oil layer, the polymer aqueous solution is expected to keep certain viscosity, and the fluidity of the polymer solution is controlled to achieve better oil displacement effect. However, it is desirable that the polymer-containing solution, after it has entered the wellbore from the reservoir, has a reduced viscosity, and is not so viscous that the polymer does not coagulate and clog the flow channels.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a rotary shear type polymer viscosity reduction device so as to reduce the viscosity of polymer-containing well fluid entering a shaft and avoid coagulation.

In order to solve the technical problems, the rotary shear type polymer viscosity reducing device comprises a shell, wherein the top of the shell is connected with a first connecting part, the bottom of the shell is connected with a second connecting part, the first connecting part and the second connecting part are respectively used for being connected with a centrifugal pump and a protector, a transmission shaft is further arranged on the inner periphery of the shell, the top and the bottom of the transmission shaft are respectively connected with a shaft part of the centrifugal pump and a shaft part of the protector, a plurality of first liquid inlets are formed in the shell, a plurality of shearing units are connected to the outer periphery of the transmission shaft, and the shearing units are arranged along the axial direction of the transmission shaft; the shearing unit comprises a connecting sleeve which is non-rotatably connected with the transmission shaft, and a plurality of shearing blades which are arranged on the periphery of the connecting sleeve and are arranged along the circumferential direction of the transmission shaft.

The rotary shearing type polymer viscosity reducing device is arranged between the centrifugal pump and the protector, has the functions of up-and-down connection, power transmission and well fluid passage, also has the function of shearing polymers in well fluid, is long-chain high polymer substances, has great influence on the viscosity of compound solution due to shearing, and is especially polyacrylamide polymers. The greater the flow rate, i.e., the greater the shear rate, of the polymer solution, the faster the viscosity of the solution decreases. When the well fluid containing the polymer enters the shell from the first fluid inlet, and the entered well fluid moves upwards under the action of the centrifugal pump; meanwhile, the transmission shaft rotates under the drive of the submersible motor to drive the shearing unit to rotate at a high speed, and when the upward-moving well fluid passes through the shearing unit, the upward-moving well fluid is sheared and reduced in viscosity by the shearing blades rotating at a high speed, and the most effective shearing and viscosity reducing effect is achieved after the upward-moving well fluid passes through the shearing units in a step-by-step and repeated shearing mode, so that the well fluid containing the polymer is prevented from being condensed and is prevented from being attached to the flow channel of the oil extraction equipment, the flow channel is blocked, and the efficiency or the normal operation of the oil extraction equipment is influenced.

Preferably, the plurality of shearing blades are equidistantly arranged along the axial direction of the connecting sleeve, and the plurality of shearing blades are arranged at equal angles along the circumferential direction of the connecting sleeve. The shearing blades are arranged at equal angles, so that the device can run more stably; and the shearing blades are equidistantly arranged along the axial direction of the connecting sleeve, so that the well fluid can be sheared for multiple times when passing through the same shearing unit, and the shearing viscosity reduction efficiency of the well fluid is improved.

Preferably, the cross section of the shearing blade is diamond-shaped. The diamond-shaped shearing blade is thick in the middle and thin in the two ends, so that the strength and rigidity of the shearing blade can be improved while the sharp diamond edge of the shearing blade is ensured.

Preferably, a plurality of first limiting sleeves are sleeved on the periphery of the transmission shaft, and the first limiting sleeves are used for limiting the axial position of the shearing unit relative to the transmission shaft.

Preferably, the second connecting part is provided with a plurality of second liquid inlets. The first liquid inlet and the second liquid inlet are arranged, so that liquid inlet efficiency can be improved.

Preferably, a plurality of righting bodies are arranged between the periphery of the transmission shaft and the inner periphery of the shell, the periphery of the righting bodies is in non-rotatable connection with the shell, the righting bodies are rotatably sleeved on the periphery of the transmission shaft, and a plurality of channels are arranged on the righting bodies in a penetrating manner along the axial direction of the righting bodies. The design of the centralizing body can support and centralize the transmission shaft.

Preferably, the inner circumference fixedly connected with first wear-resisting cover of the body of righting, the periphery fixedly connected with second wear-resisting cover of transmission shaft, first wear-resisting cover with second wear-resisting cover circumference sliding connection. The first wear-resistant sleeve and the second wear-resistant sleeve are designed to prevent the righting body and the transmission shaft from being worn.

Preferably, one said righting body is provided between two adjacent shearing units.

Preferably, a plurality of second limiting sleeves are arranged on the inner periphery of the shell, and the second limiting sleeves are used for limiting the axial position of the centering body relative to the shell; the outer periphery of the second limiting sleeve is matched with the inner Zhou Shi of the shell.

Preferably, the connecting sleeve is connected with the transmission shaft through a key.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a rotary shear type polymer viscosity reducing device according to an embodiment of the present invention;

fig. 2 is a partial enlarged view P in fig. 1;

FIG. 3 is a schematic view of a centralizer according to an embodiment of the invention;

FIG. 4 is a front view of a shear unit according to an embodiment of the present invention;

FIG. 5 is a top view of a shear unit according to an embodiment of the present invention;

fig. 6 is a cross-sectional view A-A of fig. 5.

Reference numerals:

1-a housing; 11-a first liquid inlet; 2-a first connection; 3-a second connection; 31-a second liquid inlet; 4-a transmission shaft; 41-a second wear sleeve; 42-a first limit sleeve; a 5-shear unit; 51-connecting sleeve; 52-shearing blades; 6-righting body; 61-channel; 62-a first wear sleeve; 63-a second stop collar.

Detailed Description

Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.

As shown in fig. 1, 2, 3, 4, 5 and 6, the present embodiment provides a rotary shear type polymer viscosity reducing device, which includes a housing 1, a first connecting portion 2 is screwed to the top of the housing 1, and a second connecting portion 3 is screwed to the bottom of the housing 1, wherein the first connecting portion 2 and the second connecting portion 3 are respectively used for connecting with a centrifugal pump and a protector. A drive shaft 4 is further provided at the inner periphery of the housing 1, and the top and bottom of the drive shaft 4 are connected with the shaft portion of the centrifugal pump and the shaft portion of the protector, respectively, for transmitting power. The casing 1 is provided with a plurality of first liquid inlets 11, the second connecting part 3 is provided with an inclined second liquid inlet 31, and when the casing is used, polymer-containing well liquid can enter the casing through the first liquid inlets 11 and the second liquid inlets 31 under the action of a centrifugal pump and gradually move upwards.

Further, four sets of shearing units 5 are connected to the outer periphery of the drive shaft 4, and the four sets of shearing units 5 are arranged along the axial direction of the drive shaft 4. The shearing unit 5 includes a connecting sleeve 51 keyed to the driving shaft 4, and three shearing blades 52 integrally formed at the outer circumference of the connecting sleeve 51, the shearing blades 52 being disposed along the circumferential direction of the driving shaft. Specifically, three shear blades 52 are arranged at 120 ° intervals around the axis of the connection sleeve 51, and the three shear blades 52 are arranged equidistantly in the axis direction of the connection sleeve 51.

In this embodiment, the shearing unit 5 rotates at a high speed under the drive of the transmission shaft 4, when the well fluid passes through the shearing unit 5 from bottom to top, the polymer in the well fluid is sheared and reduced in viscosity by the shearing blades 52 rotating at a high speed, and after the polymer is sheared step by step and multiple times by the shearing units 5, the most effective shearing and viscosity reducing effect is achieved, the well fluid containing the polymer is prevented from being condensed and attached to the flow passage of the oil extraction equipment, the flow passage is prevented from being blocked, and the efficiency or the normal operation of the oil extraction equipment is affected.

In practice, the well fluid entering from the second fluid inlet 31 can be sheared and reduced in viscosity by the four shearing units 5, and the viscosity reducing effect is optimal. However, if the well fluid only enters from the second fluid inlet 31, the fluid inlet efficiency will be reduced, so, in order to ensure the fluid inlet efficiency and the shearing effect, the shearing unit 5 is disposed above each first fluid inlet 11 in this embodiment, so as to ensure that the well fluid entering the casing 1 can be sheared and viscosity reduced.

Further, the cross section of the shearing blade 52 is diamond-shaped, so that the shearing blade 52 is in a shape with thick middle and thin two ends, and the strength and the rigidity of the shearing blade 52 can be improved while the edge of the shearing blade 52 can be ensured.

Further, four centralizing bodies 6 are arranged between the outer periphery of the transmission shaft 4 and the inner periphery of the shell 1, the centralizing bodies 6 and the shearing units 5 are arranged in an up-and-down staggered mode, and a plurality of channels 61 are arranged on the centralizing bodies 6 in a penetrating mode along the axial direction of the centralizing bodies so that well fluid can pass through conveniently. The periphery of this righting body 6 and casing 1 interference fit, the periphery of transmission shaft 4 is located to this righting body 6 rotatable cover, and righting body 6 can play the supporting role to transmission shaft 4, in order to prevent righting body 6 and transmission shaft 4 wearing and tearing, this embodiment is at the first wear-resisting cover 62 of the inner periphery fixedly connected with of righting body 6, at the periphery fixedly connected with second wear-resisting cover 41 of transmission shaft 4, first wear-resisting cover 62 second wear-resisting cover 41 circumference sliding connection, and this first wear-resisting cover 62 and second wear-resisting cover 41 adopt wear-resisting carbide to make.

Specifically, the outer periphery of the transmission shaft 4 of this embodiment is sleeved with a plurality of first stop collars 42, and a retaining ring is respectively embedded in the upper part and the lower part of the outer periphery of the transmission shaft 4, each first stop collar is located between two retaining rings, and the retaining ring and the first stop collars 42 are matched to define the axial position of the shearing unit 5 relative to the transmission shaft 4.

Similarly, a number of second stop collars 63 are provided between adjacent two centralizers 6, between the uppermost centralizer 6 and the first connector 2 and between the lowermost centralizer 6 and the second connector 3, the outer periphery of the second stop collars 63 cooperating with the inner Zhou Shi of the housing for defining the axial position of the centralizer 6 relative to the housing 1.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims

1. The utility model provides a gyration shearing formula polymer viscosity reduction device, includes the casing, and the top of this casing is connected with first connecting portion, and the bottom of this casing is connected with second connecting portion, first connecting portion and second connecting portion are used for being connected with centrifugal pump and protector respectively the inner periphery of casing still is provided with the transmission shaft, the top and the bottom of this transmission shaft respectively with the shaft part of centrifugal pump with the shaft part of protector is connected, and be provided with a plurality of first inlet on the casing, its characterized in that:

the periphery of the transmission shaft is connected with a plurality of shearing units, and the shearing units are arranged along the axial direction of the transmission shaft;

the shearing unit comprises a connecting sleeve which is non-rotatably connected with the transmission shaft, and a plurality of shearing blades which are arranged on the periphery of the connecting sleeve and are arranged along the circumferential direction of the transmission shaft;

the shearing blades are equidistantly arranged along the axial direction of the connecting sleeve, and the shearing blades are arranged at equal angles along the circumferential direction of the connecting sleeve;

the cross section of the shearing blade is diamond-shaped.

2. The rotary shear type polymer viscosity reducing device according to claim 1, wherein:

and a plurality of first limiting sleeves are sleeved on the periphery of the transmission shaft and are used for limiting the axial position of the shearing unit relative to the transmission shaft.

3. The rotary shear type polymer viscosity reducing device according to claim 1, wherein:

and a plurality of second liquid inlets are formed in the second connecting part.

4. The rotary shear type polymer viscosity reducing device according to claim 1, wherein:

a plurality of righting bodies are arranged between the periphery of the transmission shaft and the inner periphery of the shell, the periphery of the righting bodies is connected with the shell in a non-rotatable mode, the righting bodies are rotatably sleeved on the periphery of the transmission shaft, and a plurality of channels are arranged on the righting bodies in a penetrating mode along the axis direction of the righting bodies.

5. The rotary shear type polymer viscosity reducing device according to claim 4, wherein:

the inner periphery fixedly connected with first wear-resisting cover of the body of righting, the periphery fixedly connected with second wear-resisting cover of transmission shaft, first wear-resisting cover with second wear-resisting cover circumference sliding connection.

6. The rotary shear type polymer viscosity reducing device according to claim 4, wherein:

and the righting body is arranged between every two adjacent shearing units.

7. The rotary shear type polymer viscosity reducing device according to claim 4, wherein:

a plurality of second limiting sleeves are arranged on the inner periphery of the shell and are used for limiting the axial position of the centering body relative to the shell;

the outer periphery of the second limiting sleeve is matched with the inner Zhou Shi of the shell.

8. The rotary shear type polymer viscosity reducing device according to claim 1, wherein:

the connecting sleeve is connected with the transmission shaft through a key.