Soft labyrinth sealing ring oil well pump plunger and oil well pump

Abstract

The invention relates to a soft labyrinth sealing ring oil well pump plunger which comprises a traveling valve assembly, a plunger body and a PA sealing ring, the upper end of the plunger body is connected with the traveling valve assembly, a PA sealing ring radial installation groove is formed in the outer diameter of the plunger body, the PA sealing ring is installed in the PA sealing ring radial installation groove, and the PA sealing ring is installed in the PA sealing ring radial installation groove. And a liquid inlet horn mouth is formed in the lower end of the plunger body. The invention further relates to the soft labyrinth sealing ring oil well pump. The invention aims to thoroughly solve the problem of sand blockage between a plunger and a pump cylinder in a sand-containing, thickened oil and wax precipitation oil well, particularly reduce the friction force between the plunger and the pump cylinder, contribute to reducing eccentric wear of a rod and a pipe and improve the pump efficiency. The development of the oil well pump plays a role in normal development and production of an oil field mechanical production well, reduction of eccentric wear of a rod pipe, improvement of pump efficiency, prolonging of an oil well pump inspection period and improvement of oil well production time rate.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield development and oil production lifting pumps, and in particular relates to a soft labyrinth sealing ring oil pump plunger and an oil pump. Background Art

[0002] The rod pump is one of the traditional oil production methods in the petroleum industry, and it is also the dominant mechanical oil production lifting method in oil production engineering. More than 80% of the production wells in oil fields across the country use the rod pump lifting process.

[0003] As an important lifting equipment of the rod pumping system, the downhole oil pump has a complex working environment and harsh conditions. It has the characteristics of simple structure, high strength, good quality, reliable sealing of connecting parts, good material wear resistance and corrosion resistance, and long service life. In order to meet the production needs of different oil wells, in addition to standard oil pumps, a variety of special types of oil pumps have been developed, such as double-acting pumps and casing pumps for large displacement, anti-gas pumps for high oil-gas ratio wells, streamlined pumps and hydraulic feedback pumps for heavy oil production, anti-sand pumps for sand-rich oil wells, suspension pumps used in directional wells, and bridge pumps suitable for deep well oil extraction.

[0004] In terms of oil well pump parts, on the one hand, the durability of the pump barrel and plunger pair is improved, and the pump barrel adopts a variety of treatment processes such as nitriding, carbon helium co-diffusion, composite coating and hard chrome plating. The plunger adopts hard chrome plating, spray welding nickel-based alloy and spray ceramics. On the other hand, the reliability of the valve assembly is improved, and high-carbon chromium stainless steel, cast cobalt and other materials are used instead of stainless steel. Different density corrosion-resistant and anti-scouring valve balls are developed to meet the needs of crude oil extraction with different densities and viscosities.

[0005] However, the existing oil pumps cannot fully adapt to the harsh working conditions underground, and are even less adapted to the current economic needs of high efficiency and low cost. Summary of the invention

[0006] The purpose of the present invention is to provide a soft labyrinth sealing ring oil pump plunger and an oil pump in view of the defects and shortcomings of the prior art, so as to completely solve the sand sticking of the plunger and the pump barrel in sand-containing, heavy oil and wax-containing oil wells, especially to reduce the friction between the plunger and the pump barrel, help to reduce the eccentric wear of the rod and the pipe, and improve the pump efficiency.

[0007] The present invention solves the technical problem by the following technical solutions:

[0008] A soft labyrinth sealing ring oil pump plunger, characterized in that it includes a traveling valve assembly, a plunger body and a PA sealing ring, the upper end of the plunger body is connected to the traveling valve assembly, a PA sealing ring radial mounting groove is provided on the outer diameter of the plunger body, the PA sealing ring is installed in the PA sealing ring radial mounting groove, and a liquid inlet bell mouth is provided at the lower end of the plunger body.

[0009] Moreover, a male threaded buckle is arranged at the upper end of the plunger body, and a common female buckle is arranged at the lower end of the traveling valve assembly, and the plunger body and the traveling valve assembly are connected through the cooperation of the male threaded buckle and the common female buckle.

[0010] Moreover, the upper end of the floating valve assembly is connected to the sucker rod column, and a suction floating valve is installed inside the floating valve assembly. The upper outer diameter of the floating valve assembly is a smooth tube, and the inner diameter is provided with a standard sucker rod female buckle. The lower outer diameter of the floating valve assembly is an expanded diameter smooth tube, and the upper end of the inner diameter is provided with three long liquid outlet holes, and the lower end is provided with a mounting valve seat.

[0011] Moreover, the number of the PA sealing ring radial installation grooves is several and they are evenly distributed on the outer diameter of the plunger body.

[0012] Moreover, a pressure transfer groove is provided at the upper end of the PA sealing ring, and the lower end of the PA sealing ring is a flat, disconnected circular ring.

[0013] Furthermore, the PA sealing ring is molded with pure thermoplastic resin and forms a labyrinth structure around the plunger body, and the molded gap of each PA sealing ring can transmit static pressure along the entire plunger body.

[0014] A soft labyrinth seal ring oil pump, characterized in that the soft labyrinth seal ring oil pump plunger is adopted.

[0015] The advantages and beneficial effects of the present invention are:

[0016] 1. The soft labyrinth sealing ring of the oil pump plunger of the present invention adopts imported composite materials, which can meet the complex downhole working conditions in terms of technical properties such as high strength, good toughness, strong resilience, wear resistance, temperature resistance, and corrosion resistance, and is made into a ring for the outer seal of the plunger, especially a plurality of rings of the plunger form a soft labyrinth seal on the periphery. When the plunger moves upward, the soft labyrinth sealing ring expands under the pressure of the liquid column to improve the sealing performance between the plunger and the pump barrel, reduce the leakage of the pump and improve the pump efficiency; when the soft labyrinth sealing ring plunger moves downward, the soft labyrinth sealing ring is squeezed and contracted by the liquid at the bottom of the pump barrel, reducing the friction between the plunger and the pump barrel, making the plunger and the rod column move downward more quickly, thereby reducing the chance of the rod column bending due to large friction resistance when moving downward, causing eccentric wear of the rod tube.

[0017] 2. The development of the soft labyrinth seal ring oil pump of the present invention plays a role in the normal development and production of oilfield machine-produced wells, reducing eccentric wear of rods and pipes, improving pump efficiency, extending the oil well inspection cycle, and increasing the production rate of oil wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the PA sealing ring of the present invention.

[0020] Description of Reference Numerals

[0021] 1-traveling valve assembly, 2-plunger body, 3-PA sealing ring. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0023] A soft labyrinth sealing ring oil pump plunger, the innovation of which lies in: comprising a traveling valve assembly 1, a plunger body 2 and a PA sealing ring 3, the upper end of the plunger body being connected to the traveling valve assembly, a PA sealing ring radial mounting groove being provided on the outer diameter of the plunger body, a PA sealing ring being installed in the PA sealing ring radial mounting groove, and a liquid inlet bell mouth being provided at the lower end of the plunger body.

[0024] A male threaded buckle is arranged at the upper end of the plunger body, and a common female buckle is arranged at the lower end of the traveling valve assembly. The plunger body and the traveling valve assembly are connected through the cooperation of the male threaded buckle and the common female buckle.

[0025] The upper end of the traveling valve assembly is connected to the sucker rod column, and a suction traveling valve is installed inside the traveling valve assembly. The upper outer diameter of the traveling valve assembly is a smooth tube, and the inner diameter is provided with a standard sucker rod female buckle. The lower outer diameter of the traveling valve assembly is an expanded diameter smooth tube, and the upper end of the inner diameter is provided with three long liquid outlet holes, and the lower end is provided with a mounting valve seat.

[0026] The number of the PA sealing ring radial installation grooves is several and they are evenly distributed on the outer diameter of the plunger body.

[0027] The upper end of the PA sealing ring is provided with a pressure transmission groove, and the lower end of the PA sealing ring is a flat, disconnected circular ring.

[0028] The PA sealing ring is molded with pure thermoplastic resin and forms a labyrinth structure around the plunger body. The molded gap of each PA sealing ring can transmit static pressure along the entire plunger body.

[0029] A soft labyrinth seal ring oil pump, the innovation of which lies in: adopting the soft labyrinth seal ring oil pump plunger.

[0030] The present invention mainly solves the problems of large friction and large leakage between the plunger and the pump barrel of the existing machine-extracted oil well pump. A plurality of PA rings of the best quality and 100% pure thermoplastic resin molded on the periphery of the plunger body are used to form a labyrinth seal on the periphery of the plunger. The molded gap of each ring can transmit static pressure along the entire plunger, rather than concentrating all pressure on the top and bottom of the ring; taking advantage of the efficient transmission of static pressure, the PA ring expands during the upstroke to provide the necessary seal to achieve higher pump efficiency; it contracts during the downstroke to reduce the resistance of the descending plunger; the produced fluid can carry sand and scale particles through the space between the plunger and the pump barrel to prevent particles from getting stuck in the pump; so the plunger of the invention is suitable for any harsh well conditions.

[0031] On the ground, according to the pump hanging depth and pump (diameter) specifications of the well completion lifting column, a corresponding soft labyrinth seal ring plunger is prepared, and the pump with the corresponding soft labyrinth seal ring plunger is lowered into the well according to the completion lifting column design. After the well is completed, the wellhead process, the sucker rod column and the ground pumping unit hanger are connected, and all the work of opening the well is ready, the pumping unit is started for normal production. When the hanger on the donkey head of the pumping unit drags the sucker rod column in the well up and down to pump oil, the soft labyrinth seal ring plunger in the pump barrel of the downhole pump moves up and down in the pump barrel under the drag of the sucker rod column to suck the formation fluid.

[0032] Working process of the soft labyrinth sealing ring plunger in the pump barrel: When the sucker rod drags the traveling valve assembly and the traveling valve assembly connected to the plunger body moves upward, the liquid outlet valve of the traveling valve assembly is closed under the action of the liquid column. At this time, the liquid column in the lifting column can only act on the gap between the plunger and the pump barrel. The PA sealing rings evenly installed on the outer diameter of the plunger body are acted on by the liquid column above. When the pressure is transmitted to the outer ring (upper) inclined groove of the ring, multiple soft sealing rings expand slightly and seal tightly with the pump barrel to reduce the leakage of produced liquid in the pump barrel, thereby achieving high pump efficiency.

[0033] When the pumping rod drags the traveling valve assembly and the traveling valve assembly connected to the plunger body to move downward, the hydraulic pressure in the pump barrel rises and the traveling valve assembly opens the outlet valve under the action of the liquid in the pump barrel. At this time, the high hydraulic pressure in the pump barrel also acts on the gap between the plunger and the pump barrel. The PA sealing rings evenly installed on the outer diameter of the plunger body are subjected to the action of the lower (flat) hydraulic pressure, and multiple soft sealing rings shrink slightly to make space with the pump barrel: due to the increase in the gap between the plunger and the pump barrel, the high hydraulic pressure in the pump barrel reduces the downward resistance of the plunger, and the downward bending and eccentric wear of the pumping rod column are reduced; the gap between the plunger and the pump barrel is increased to prevent sand and debris particles from getting stuck in the pump. Due to the high temperature and wear resistance of the PA sealing ring, the oil pump with this soft labyrinth sealing ring plunger is highly adaptable, durable, efficient, and helps prevent eccentric wear of the rod and pipe. It is a mechanical oil production supporting oil pump that reduces costs and increases benefits.

[0034] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A soft labyrinth seal ring oil well pump plunger, characterized in that: It includes a traveling valve assembly, a plunger body and a PA sealing ring. The upper end of the plunger body is connected to the traveling valve assembly. A PA sealing ring radial mounting groove is provided on the outer diameter of the plunger body. The PA sealing ring is installed in the PA sealing ring radial mounting groove. The lower end of the plunger body is provided with a liquid inlet bell mouth.

2. The soft labyrinth seal ring oil pump plunger according to claim 1, characterized in that: A male threaded buckle is arranged at the upper end of the plunger body, and a common female buckle is arranged at the lower end of the traveling valve assembly. The plunger body and the traveling valve assembly are connected through the cooperation of the male threaded buckle and the common female buckle.

3. The soft labyrinth seal ring oil well pump plunger according to claim 1, characterized in that: The upper end of the traveling valve assembly is connected to the sucker rod column, and a suction traveling valve is installed inside the traveling valve assembly. The upper outer diameter of the traveling valve assembly is a smooth tube, and the inner diameter is provided with a standard sucker rod female buckle. The lower outer diameter of the traveling valve assembly is an expanded diameter smooth tube, and the upper end of the inner diameter is provided with three long liquid outlet holes, and the lower end is provided with a mounting valve seat.

4. The soft labyrinth seal ring oil well pump plunger according to claim 1, characterized in that: The number of the PA sealing ring radial installation grooves is several and they are evenly distributed on the outer diameter of the plunger body.

5. The soft labyrinth seal ring oil well pump plunger according to claim 1, characterized in that: The upper end of the PA sealing ring is provided with a pressure transmission groove, and the lower end of the PA sealing ring is a flat, disconnected circular ring.

6. The soft labyrinth seal ring oil well pump plunger according to claim 1, characterized in that: The PA sealing ring is molded with pure thermoplastic resin and forms a labyrinth structure around the plunger body. The molded gap of each PA sealing ring can transmit static pressure along the entire plunger body.

7. A soft labyrinth seal ring oil pump, characterized in that: A soft labyrinth seal ring oil pump plunger as claimed in any one of claims 1 to 6 is used.

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