Dynamic thin and thick oil mixing device

Abstract

The invention relates to a novel dynamic thin and thick oil mixing device, comprising a tubular outer shell, wherein a rotating shaft is axially installed in the outer shell, a double-line impeller is fixedly installed at the upstream end of the rotating shaft, and a plurality of support frames are rotatably installed at the downstream end of the rotating shaft, wherein the support frames are provided with flow holes and the support frames are limited by the outer shell, at least one pair of stirring impellers are fixedly installed between the support frames, and an isolation sleeve is installed between the stirring impellers, and a plurality of liquid inlet holes are circumferentially opened on the outer shell, and a filter screen is fixedly installed on the liquid inlet holes, and the liquid entering the inner part of the outer shell through the liquid inlet holes passes through the double-line impeller and the stirring impeller in sequence; the invention can enhance the thin and thick oil mixing effect, and is particularly suitable for electric pump wells with super-thick oil and high asphaltene content, and reduces the risk of pump blockage caused by heavy oil, prolongs the service life of the electric pump, and saves costs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil extraction industry, and in particular relates to a novel dynamic dilute and thick oil mixing device. Background Art

[0002] The production of super heavy oil by electric pump is done by mixing thin oil with heavy oil to reduce viscosity and pumping with electric pump. As the water content of the oil well increases, the viscosity-temperature inflection point decreases, and the mixing of thin and heavy oils is poor. At the same time, with the development of super heavy oil blocks, there is a great demand for thin oil, and the current process of mixing thin and heavy oils is inefficient.

[0003] Therefore, based on these problems, there is an urgent need for a thin and thick oil mixing device, which can improve the thin and thick oil mixing effect on the one hand, and on the other hand improve the thin and thick oil mixing efficiency to save thin oil and avoid pump clogging with heavy oil, so as to ensure the stable production of oil wells and extend the life of electric pumps. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a novel dynamic dilute and thick oil mixing device which can improve the dilute and thick oil mixing effect and efficiency and save dilute oil.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] A novel dynamic thin and thick oil mixing device comprises a tubular outer shell, a rotating shaft is axially installed in the outer shell, a double-line impeller is fixedly installed at the upstream end of the rotating shaft, a plurality of support frames are rotatably installed at the downstream end of the rotating shaft, the support frames are provided with flow holes, and the support frames are limited by the outer shell, at least one pair of stirring impellers are fixedly installed between the support frames, and isolation sleeves are installed between the stirring impellers, a plurality of liquid inlet holes are circumferentially opened on the outer shell, and a filter screen is fixedly installed on the liquid inlet holes, and the liquid entering the inner part of the outer shell through the liquid inlet holes passes through the double-line impeller and the stirring impeller in sequence.

[0007] Furthermore, the upstream side of the rotating shaft is rotationally limitedly connected to the outer shell, and a sand-proof cap is fixedly installed on the rotating shaft at the connection.

[0008] Furthermore, a first embedded outer sleeve is fixedly installed on the outer wall of the rotating shaft, and a first embedded inner sleeve is fixedly installed on the inner wall of the supporting frame. The rotating shaft and the supporting frame rotate via the first embedded outer sleeve and the first embedded inner sleeve.

[0009] Furthermore, a second embedded outer sleeve is fixedly installed on the outer wall of the upstream side of the rotating shaft, and a second embedded inner sleeve is fixedly installed on the inner wall of the outer shell. The upstream side of the rotating shaft rotates with the outer shell through the second embedded outer sleeve and the second embedded inner sleeve.

[0010] Furthermore, a limiting spacer is fixedly mounted on the rotating shaft, and the limiting spacer cooperates with the sand-proof cap to realize axial limitation of the rotating shaft.

[0011] Furthermore, spline sleeve assemblies are fixedly mounted on both ends of the rotating shaft.

[0012] Furthermore, the outer shell includes an upper pump head, an outer shell, and a lower joint which are fixedly connected in sequence to form a tubular structure.

[0013] The advantages and positive effects of the present invention are:

[0014] The device of the present invention is powered by a submersible motor. Fluid enters the device and passes through a double-line impeller. The double-line impeller rotates at high speed to perform preliminary mixing on the mixed liquid. When the flow rate increases, the fluid passes through the stirring impeller and is mixed again under the rotation of the high-speed impeller, thereby achieving multiple high-efficiency mixing. The application of the device can enhance the thin-thick mixing effect, and is particularly suitable for electric pump wells with super-thick oil and high asphaltene content, and reduces the risk of heavy oil backflow and pump blocking, thereby extending the service life of the electric pump and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0016] Figure 1 It is a structural cross-sectional view of a novel dynamic thin-and-thick oil mixing device provided in an embodiment of the present invention; DETAILED DESCRIPTION

[0017] First, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0020] Example

[0021] A novel dynamic thin and thick oil mixing device comprises a tubular outer shell, wherein a rotating shaft 32 is axially installed in the outer shell, a double-line impeller 11 is fixedly installed at the upstream end of the rotating shaft, and a plurality of support frames 4 are rotatably installed at the downstream end of the rotating shaft. Specifically, a first embedded outer sleeve 30 is fixedly installed on the outer wall of the rotating shaft, and a first embedded inner sleeve 29 is fixedly installed on the inner wall of the support frame, and the rotating shaft and the support frame are rotated by the first embedded outer sleeve and the first embedded inner sleeve; a flow hole 401 is provided on the support frame, and the support frame is limited by the outer shell, at least a pair of stirring impellers 10 are fixedly installed between the support frames, and an isolation sleeve 31 is installed between the stirring impellers; a plurality of liquid inlet holes 27 are circumferentially opened on the outer shell, and a filter screen 26 is fixedly installed on the liquid inlet hole. It can be considered that the filter screen 26 is arranged in an annular manner, and the filter screen is fixed by a filter screen card 28 arranged in an annular manner, so that it filters the liquid inlet hole, and the liquid entering the inner part of the outer shell through the liquid inlet hole passes through the double-line impeller and the stirring impeller in sequence.

[0022] In this embodiment, the upstream side of the rotating shaft is connected to the outer shell in a rotationally limited manner, and a sand-proof cap 25 is fixedly installed on the rotating shaft at the connection point by a positioning screw 12; specifically, a second embedded outer sleeve 23 is fixedly installed on the outer wall of the upstream side of the rotating shaft, and a second embedded inner sleeve 13 is fixedly installed on the inner wall of the outer shell, and the upstream side of the rotating shaft and the outer shell rotate through the second embedded outer sleeve and the second embedded inner sleeve; a bearing sleeve 24 is installed between the second embedded outer sleeve and the sand-proof cap 25, and the bearing sleeve 24 and the sand-proof cap 25 work together to play a role in sand prevention, and the two cooperate with each other to prevent sand particles in the well fluid from moving to the upstream side of the rotating shaft; a limiting spacer sleeve 14 is also fixedly installed on the rotating shaft, and the limiting spacer sleeve cooperates with the sand-proof cap to achieve axial limitation of the rotating shaft, so that the rotating shaft cannot move axially.

[0023] In addition, the two ends of the rotating shaft are respectively fixed with a spline sleeve assembly, such as Figure 1 As shown, the first spline sleeve assembly 3 and the second spline sleeve assembly 19 are respectively installed at both ends of the rotating shaft.

[0024] Furthermore, the outer shell includes an upper pump head 8, an outer shell 5, and a lower joint 22 which are fixedly connected in sequence to form a tubular structure. The upper pump head 8 and the outer shell 5 are threadedly connected, and a friction-reducing pad 9 is installed at the connection. In the present embodiment, there are three support frames, which are limited by compression rings 6. The support frames at both ends are limited by the upper pump head 8 and the lower joint 22 respectively; and a nameplate 20 is also fixedly installed on the outer wall of the lower joint 22 by rivets 21.

[0025] In order to protect the new dynamic thin-and-thick oil mixing device during transportation, it is possible to consider installing an upper protective cover 7 on the upper pump head side, installing the upper protective cover 7 on the upper pump head through bolts 1, and installing a spring washer 2 between the bolts 1 and the upper protective cover; installing a transport cap 18 on the lower joint side, and fixing the transport cap to the lower joint through bolts 17, nuts 15 and spring washers 16.

[0026] As an example, in this embodiment, when the device is used, the device is assembled between the centrifugal pump and the protector of the submersible electric pump unit, connected by a spline sleeve assembly, and powered by a motor. When the well fluid (heavy oil and thin oil) enters the centrifugal pump from the liquid inlet, the mixed liquid undergoes three-stage stirring in the outer shell, firstly stirred by a double-line impeller, then stirred by a stirring impeller, and the thin oil and heavy oil are stirred by the power of the submersible motor and three sets of specially designed impellers, forming a high-speed vortex during stirring, so that the heavy oil and thin oil fully collide, cut, and mix with each other, achieving the best mixing effect, thereby improving the mixing effect of the thin and thick oils, so that the thin and thick oils are fully stirred and mixed before entering the centrifugal pump, especially for heavy oil wells with high asphalt and water content, the effect is more obvious, which can improve the efficiency of thin oil and save thin oil.

[0027] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. Dynamic thin and thick oil mixing device, characterized by: It comprises a tubular outer shell, a rotating shaft is axially installed in the outer shell, a double-line impeller is fixedly installed at the upstream end of the rotating shaft, a plurality of support frames are rotatably installed at the downstream end of the rotating shaft, the support frames are provided with flow holes, and the support frames are limited by the outer shell, at least one pair of stirring impellers are fixedly installed between the support frames, and a spacing sleeve is installed between the stirring impellers, a plurality of liquid inlet holes are circumferentially opened on the outer shell, a filter screen is fixedly installed on the liquid inlet holes, and the liquid entering the inner part of the outer shell through the liquid inlet holes passes through the double-line impeller and the stirring impeller in sequence; The upstream side of the rotating shaft is connected to the outer shell in a rotationally limited manner, and a sand-proof cap is fixedly installed on the rotating shaft at the connection; A first embedded outer sleeve is fixedly installed on the outer wall of the rotating shaft, and a first embedded inner sleeve is fixedly installed on the inner wall of the supporting frame, and the rotating shaft and the supporting frame are rotated by the first embedded outer sleeve and the first embedded inner sleeve; The second embedded outer sleeve is fixedly installed on the outer wall of the upstream side of the rotating shaft, and the second embedded inner sleeve is fixedly installed on the inner wall of the outer shell. The upstream side of the rotating shaft rotates with the outer shell through the second embedded outer sleeve and the second embedded inner sleeve.

2. The dynamic thin-and-thick oil mixing device according to claim 1, characterized in that: A limiting spacer is also fixedly mounted on the rotating shaft, and the limiting spacer cooperates with the sand-proof cap to realize axial limiting of the rotating shaft.

3. The dynamic thin-and-thick oil mixing device according to claim 1, characterized in that: The two ends of the rotating shaft are respectively fixedly mounted with spline sleeve assemblies.

4. The dynamic thin-and-thick oil mixing device according to claim 1, characterized in that: The outer shell comprises an upper pump head, an outer shell and a lower joint which are fixedly connected in sequence to form a tubular structure.

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