Segmented sand setting two-way pump

Abstract

The invention discloses a segmented sand setting two-way pump, and belongs to the technical field of petroleum extraction equipment. The two-way pump comprises a sucker rod, an upper valve cover, an oil outlet valve, a long plunger, a short pump cylinder, an outer pipe and a two-way standing valve; the short pump cylinder is sleeved with the outer pipe in a stacked mode to form an annular cavity with the open upper portion and the closed bottom, the long plunger and the short pump cylinder are matched to form a friction pair, the oil outlet valves are assembled at the upper end and the lower end of the long plunger respectively, the upper valve bonnet is installed on the oil outlet valve at the upper end, and the sucker rod is connected with the upper valve bonnet in a matched mode. Lateral oil feeding is adopted in the two-way standing valve, an oil feeding valve and a sand setting cavity are arranged in the two-way standing valve, the two-way standing valve is fixedly connected to the bottom of the outer pipe, and the long plunger is communicated with an oil way of the two-way standing valve. The upper portion and the bottom of the two-way pump are each provided with the sand setting cavity, a two-way structure is adopted, it is guaranteed that the bottom oil inlet function and the sand setting function do not interfere with each other, the sand setting space can be enlarged, and upstream crude oil can be cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction equipment, and in particular to a segmented sand settling double-pass pump. Background Art

[0002] my country's loose sandstone reservoirs are widely distributed and have large reserves. This type of sandstone is shallowly buried and has weak rock cementation. Therefore, during the production process, the formation is prone to sand production due to pressure reduction or fluid drag. Sand production often leads to sand-buried oil layers or sand blockage in the wellbore. Sand particles enter the gap between the plunger and the pump barrel, causing the pumping equipment to get stuck or strained. Sand jams in ground or downhole equipment and frequent maintenance such as sand flushing, pump inspection, and ground tank cleaning increase the workload dramatically, which not only increases the cost of crude oil production, but also increases the difficulty of oilfield management. Sand control is one of the essential process measures for the development of oil wells prone to sand production, and plays an important role in stabilizing crude oil production and improving development benefits.

[0003] The commonly used sand prevention oil pump at present is to add a sand retaining ring at the mouth of the pump barrel, or design a double-tube set structure, leaving a sand settling chamber between the pump barrel and the outer tube for sand sedimentation and storage. Since there is only an upper sand settling ring cavity in the sand prevention pump and the sand settling space is limited, for large-diameter oil pumps, due to the limitation of the oil pipe string diameter, there is almost no sand settling space, and the sand prevention effect is greatly affected. Summary of the invention

[0004] In view of this, the present invention provides a segmented sand settling two-way pump. Sand settling chambers are designed on the top and bottom of the two-way pump, and a two-way structure is adopted to ensure that the dual functions of bottom oil inlet and sand settling do not interfere with each other, which can not only increase the sand settling space, but also clean the upward crude oil.

[0005] A segmented sand settling two-way pump comprises a sucker rod, an upper valve cover, an oil outlet valve, a long plunger, a short pump barrel, an outer tube and a two-way fixed valve;

[0006] The short pump barrel is stacked inside the outer tube to form an annular chamber with an open top and a closed bottom. The long plunger and the short pump barrel cooperate to form a friction pair. An oil outlet valve is respectively installed at the upper and lower ends of the long plunger. An upper valve cover is installed on the oil outlet valve at the upper end, and the sucker rod is cooperatively connected with the upper valve cover; the two-way fixed valve adopts lateral oil inlet, and an oil inlet valve and a sand settling chamber are arranged inside. The two-way fixed valve is fixedly connected to the bottom of the outer tube, and the long plunger is connected to the oil circuit of the two-way fixed valve; when the sucker rod is in an upward stroke, the oil inlet valve in the two-way fixed valve is opened, the oil outlet valve in the long plunger is closed, and impurities in the crude oil settle in the sand settling chamber of the two-way fixed valve; when the sucker rod is in an upward stroke, the oil inlet valve in the two-way fixed valve is opened, the oil outlet valve in the long plunger is closed, and impurities in the crude oil settle in the sand settling chamber of the two-way fixed valve; when the sucker rod is in a downward stroke, the oil inlet valve is closed, the oil outlet valve is opened, and the crude oil continues to flow upward to the oil pipe cavity on the upper part of the long plunger, and the impurities in this section of crude oil settle in the annular chamber between the short pump barrel and the outer tube.

[0007] Furthermore, the two-way fixed valve comprises an oil inlet valve cover, an oil inlet valve, a two-way joint and a bottom sand settling tail pipe;

[0008] The two-way joint has a central cavity and an annular cavity surrounding the central cavity. The side of the two-way joint has an oil inlet, which is communicated with the central cavity of the two-way joint. The top of the central cavity is an oil inlet valve cover, and the bottom of the oil inlet valve cover is an oil through hole. The oil inlet valve is stuck in the position of the oil through hole to control the connection and disconnection of the central cavity and the annular cavity. The bottom sand settling tail pipe is connected to the bottom of the two-way joint, and the bottom sand settling tail pipe is communicated with the annular cavity of the two-way joint.

[0009] Furthermore, the top of the oil inlet valve cover of the two-way fixed valve has a conical roof shape.

[0010] Furthermore, the bottom of the two-way fixed valve is connected to the length of the bottom sand settling tail pipe according to actual sand settling requirements.

[0011] Furthermore, the two-way fixed valve is threadedly connected to the outer tube through the oil inlet valve cover.

[0012] Beneficial effects:

[0013] 1. The short pump barrel of the present invention is stacked inside the outer tube to form an annular chamber with an open top and a closed bottom, that is, an upper sand settling chamber. The two-way fixed valve has a sand settling chamber inside, that is, the two-way pump is designed with sand settling chambers on the top and bottom. During the working process, sand can be cleared according to different stages of the oil flow, reducing the impurity content of the upward crude oil without affecting the normal oil inlet channel.

[0014] 2. The long plunger and the short pump barrel of the present invention form a friction pair, so that the plunger does not enter the pump barrel during the up and down stroke of the pump, thereby preventing sand particles from entering the gap between the pump barrel and the plunger along with the oil and causing sand jamming the plunger; the outer tube and the pump barrel are overlapped to form an annular chamber, and the sand particles in the oil in the oil pipe column above the plunger sink into this chamber, thereby preventing sand jamming the pump barrel.

[0015] 3. The two-way fixed valve of the present invention adopts a lateral oil inlet hole return sand settling channel structure, which integrates the oil inlet and sand settling functions without interfering with each other, thus saving structural space.

[0016] 4. The top of the oil inlet valve cover of the two-way fixed valve of the present invention is designed to be in the shape of a conical roof, which can not only control the height of the oil inlet valve ball jump, but also facilitate the sinking of crude oil sand particles along the inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the segmented sand settling double-pass pump of the present invention.

[0018] Among them, 1- sucker rod, 2- upper valve cover, 3- oil outlet valve, 4- long plunger, 5- short pump barrel, 6- outer tube, 7- two-way fixed valve, 7-1- oil inlet valve cover, 7-2- oil inlet valve, 7-3- two-way joint, 7-4- bottom sand settling tail pipe. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0020] As attached Figure 1 As shown, the present invention provides a segmented sand settling two-way pump, comprising a sucker rod 1, an upper valve cover 2, an oil outlet valve 3, a long plunger 4, a short pump barrel 5, an outer tube 6 and a two-way fixed valve 7, wherein the two-way fixed valve 7 comprises an oil inlet valve cover 7-1, an oil inlet valve 7-2, a two-way joint 7-3 and a bottom sand settling tail pipe 7-4.

[0021] The short pump barrel 5 is stacked inside the outer tube 6 to form an annular chamber with an open top and a closed bottom. The annular chamber forms an upper sand settling chamber. The long plunger 4 and the short pump barrel 5 cooperate to form a friction pair. An oil outlet valve 3 is respectively installed at the upper and lower ends of the long plunger 4. An upper valve cover 2 is installed on the upper oil outlet valve. The sucker rod 1 is connected to the upper valve cover 2.

[0022] The two-way fixed valve is fixedly connected to the bottom of the outer tube 6 through a two-way joint 7-3. The two-way joint 7-3 has a central cavity and an annular cavity surrounding the central cavity. The upper end of the annular cavity is communicated with the outer tube 6. The side of the two-way joint 7-3 has an oil inlet, which is communicated with the central cavity of the two-way joint 7-3. The top of the central cavity is an oil inlet valve cover. The bottom of the oil inlet valve cover 7-1 is an oil through hole. The oil inlet valve 7-2 is stuck in the oil through hole position to control the on-off of the central cavity and the annular cavity. The bottom sand settling tail pipe 7-4 is connected to the bottom of the two-way joint 7-3. The bottom sand settling tail pipe 7-4 is communicated with the annular cavity of the two-way joint, and the bottom sand settling tail pipe 7-4 forms a bottom sand settling cavity inside.

[0023] Working principle: When the oil pump is pumping normally in the upward stroke, the oil inlet valve 7-2 is opened, the oil outlet valve 3 is closed, and the underground crude oil flows upward through the lateral oil inlet hole of the two-way fixed valve 7 and enters the space between the fixed valve and the plunger assembly. At the same time, impurities such as sand in the crude oil can be settled into the sand settling cavity at the bottom of the two-way fixed valve 7 through the annular flow channel of the two-way fixed valve 7. In the downward stroke, the oil inlet valve 7-2 is closed, the oil outlet valve 3 is opened, and the crude oil continues to flow upward into the oil pipe cavity on the upper part of the plunger. The sand and other impurities in this section of crude oil can be settled in the upper sand settling cavity between the short pump barrel 5 and the outer tube 6. As a result, the product achieves the effect of segmented sand settling during operation.

[0024] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The segmented sand settling two-way pump is characterized by: It includes a sucker rod, an upper valve cover, an oil outlet valve, a long plunger, a short pump barrel, an outer tube and a two-way fixed valve; The short pump barrel is stacked inside the outer tube to form an annular chamber with an open top and a closed bottom. The long plunger and the short pump barrel cooperate to form a friction pair. An oil outlet valve is respectively installed at the upper and lower ends of the long plunger. An upper valve cover is installed on the oil outlet valve at the upper end, and the sucker rod is cooperatively connected with the upper valve cover; the two-way fixed valve adopts lateral oil inlet, and an oil inlet valve and a sand settling chamber are arranged inside. The two-way fixed valve is fixedly connected to the bottom of the outer tube, and the long plunger is connected to the oil circuit of the two-way fixed valve; when the sucker rod is in an upward stroke, the oil inlet valve in the two-way fixed valve is opened, the oil outlet valve in the long plunger is closed, and impurities in the crude oil settle in the sand settling chamber of the two-way fixed valve; when the sucker rod is in an upward stroke, the oil inlet valve in the two-way fixed valve is opened, the oil outlet valve in the long plunger is closed, and impurities in the crude oil settle in the sand settling chamber of the two-way fixed valve; when the sucker rod is in a downward stroke, the oil inlet valve is closed, the oil outlet valve is opened, and the crude oil continues to flow upward to the oil pipe cavity on the upper part of the long plunger, and the impurities in this section of crude oil settle in the annular chamber between the short pump barrel and the outer tube.

2. The segmented sand settling two-way pump according to claim 1, characterized in that: The two-way fixed valve comprises an oil inlet valve cover, an oil inlet valve, a two-way joint and a bottom sand settling tail pipe; The two-way joint has a central cavity and an annular cavity surrounding the central cavity. The side of the two-way joint has an oil inlet, which is communicated with the central cavity of the two-way joint. The top of the central cavity is an oil inlet valve cover, and the bottom of the oil inlet valve cover is an oil through hole. The oil inlet valve is stuck in the position of the oil through hole to control the connection and disconnection of the central cavity and the annular cavity. The bottom sand settling tail pipe is connected to the bottom of the two-way joint, and the bottom sand settling tail pipe is communicated with the annular cavity of the two-way joint.

3. The segmented sand settling two-way pump according to claim 2, characterized in that: The top of the oil inlet valve cover of the two-way fixed valve has a conical roof shape.

4. The segmented sand settling two-way pump according to claim 3, characterized in that: The bottom of the two-way fixed valve is connected to the length of the bottom sand settling tail pipe according to actual sand settling requirements.

5. The segmented sand settling two-way pump according to claim 3 or 4, characterized in that: The two-way fixed valve is threadedly connected to the outer pipe through the oil inlet valve cover.

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