RU2293216C1 - Sucker-rod pumping unit with two-cylinder pump - Google Patents

Sucker-rod pumping unit with two-cylinder pump Download PDF

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RU2293216C1
RU2293216C1 RU2005114846/06A RU2005114846A RU2293216C1 RU 2293216 C1 RU2293216 C1 RU 2293216C1 RU 2005114846/06 A RU2005114846/06 A RU 2005114846/06A RU 2005114846 A RU2005114846 A RU 2005114846A RU 2293216 C1 RU2293216 C1 RU 2293216C1
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Russia
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valve
rod
pump
installation
cylinder
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RU2005114846/06A
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Russian (ru)
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RU2005114846A (en
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Абубакир Ахмадуллович Ишмурзин (RU)
Абубакир Ахмадуллович Ишмурзин
Тхинь Н н Хоанг (RU)
Тхинь Нян Хоанг
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ООО "Газнефтетехнология"
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Abstract

FIELD: oil producing industry; oil-well sucker-rod pumps.
SUBSTANCE: polished rod of pumping unit is sealed by slot seal passed through cylinder liner hermetically connected with delivery valve, and valve with through holes to control gas flow is made in form of truncated cone and is made of material whose density is lower than oil density. Delivery valve is installed in upper part of cylinder on partition in form of hemisphere with through hole closed by valve with flat seat surface.
EFFECT: prevention of sand lodging between valve and seat, reduced loads on drive part of unit operating in purposely slanted wells.
4 cl, 1 dwg

Description

The invention relates to the oil and gas industry, namely to oil production by sucker-rod pumping units, and can be used to reduce the load on the drive part of the pumping unit, in particular, when operating spatially-deviated wells.
Known installation of a downhole sucker rod pump, causing a decrease in load during the course of the column of rods up.
Known installation of a borehole sucker rod pump No. 2016235, the technical task of which is to increase the pump performance while decreasing the loads during the up stroke, has drawbacks in the complexity of the design and in the appearance of additional resistance to the movement of the piston group down, the value of which is adequate to reduce the load of the downhole sucker rod pump during the up stroke.
An analogue is also A. with. No. 2099508 "A method of lifting a gas-liquid mixture of wells and a pumping unit for its implementation." The essence of the invention is that a two-chamber pump with two plungers and a dividing baffle pumps out well production during both the up and down steps. To use the work of gas by enhancing the suction effect of the plungers and intensifying the degassing, two additional ejector devices are additionally installed.
The disadvantage of this installation of a borehole sucker rod pump is also the design complexity and the presence of longitudinal bending of the lower part of the rod string during plunger downward movement and, as a result, low pump delivery coefficient and low reliability of the installation. This is due to the fact that the pump pumps both during upward and downward strokes, i.e. is a double acting pump.
Regarding the reduction of the load due to the gas operation carried out by the pump unit, the following can be said. In directional wells, gas occupies the upper position along the generatrix of the pipe string, and in the bending sections of the pipe string causes dry friction of the rods and its wear. Therefore, in this case, the presence of gas in addition to the benefit has a negative effect.
The most structurally close to the claimed invention is a downhole pump installation, including a lifting string of pump pipes, two pump cylinders and two plungers, placed one above the other and connected in series by a hollow rod, mounted on a rod string through a polished rod and installed in cylinders with the formation of the upper and lower working chambers and the annular chamber between the cylinder of the lower pump and the hollow rod, as well as a partition with a central passage, suction, agnetatelny, reverse and control valves. (SU 1015113 A, 04/30/1983).
The disadvantage of this pump installation is that the opening and closing of the discharge valve are associated with the movement of the rod string through friction with its lower part, therefore, with the presence of a longitudinal bend of the lower portion of the rod string during plunger downward movement. The annular chamber as a pump cylinder, operating from the action of the plunger, is not suitable for pumping gas. The design of the discharge valve is not suitable for pumping liquid containing sand, and there is a risk of crushing sand in the contact gap of the seat and valve and the associated decrease in the reliability of the pump installation.
The problem solved by the pump is to eliminate the shortcomings existing in existing structures.
The task is to increase the efficiency and reliability of the sucker rod pump unit by eliminating the friction of the polished rod and rod string; the execution of the control valve in the form of a truncated cone and connecting it to the discharge valve through a flexible thread; the execution of the saddle of the main discharge valve in the form of a hemisphere with a flow hole closed by a valve with a flat seating surface; filling the annular chamber with formation water.
The problem is solved in that the rod pump installation, including a lifting column of tubing, two pump cylinders and two plungers, placed one above the other and connected in series by a hollow rod, mounted on a rod column through a polished rod and installed in cylinders with the formation of a Central and annular working chambers, as well as a partition with a Central passage channel, suction, discharge, check and control valves, characterized in that the seal the polished rod is made with a slot, passing it through a cylinder sleeve hermetically connected to the discharge valve; a suction valve is located in the upper part of the plunger group; the control valve is made in the form of a truncated cone and is connected to the discharge valve through a flexible thread; the seat of the main discharge valve is made in the form of a hemisphere with a flow hole closed by a valve with a flat seating surface; the annular chamber is filled with formation water.
The technical result provided by the proposed design of the pump is to reduce the load on the drive part of the pump installation and to increase the flow coefficient.
The drawing schematically shows a General view of a sucker rod pump unit with a two-cylinder pump.
A sucker rod pump unit with a two-cylinder pump contains a lifting column from tubing 1, a rod string 2, two pump cylinders 3 and 4 and two plungers 5 and 6, placed one above the other, forming a plunger group, and connected together in series by means of a hollow rod 7, mounted on a rod column 2 through a polished rod 8 and installed in cylinders to form a central working chamber 9, a preliminary gas separation chamber 10 and an annular working chamber 11, as well as a baffle 12 with a center lnym passageway 13 for passage of the polished rod 8, the intake 14 and discharge 15 valves. The partition 12 has gas channels 16 and 17 for passing gas into the annular chamber 11, and then into the annulus, periodically blocked by the control 18 and the check valve 19. On the discharge valve, a cylinder bushing 20 is installed at the same time with it for a gap seal of the polished rod during the plunger group stroke down. The upward movement of the discharge valve is limited by the flexible joint 21.
Cylinders 3 and 4 with plungers 5 and 6 located therein comprise plunger pairs — the upper plunger pair and the lower plunger pair. The upper plunger pair with the corresponding valves is the main liquid pump, and the lower plunger pair is the auxiliary gas supercharger. The supply of the auxiliary pump is determined by the annular cross section determined by the difference in the diameters of the plungers 5 and 6.
The pump installation operates as follows.
When plungers 5 and 6 go down, the production of the well is sucked into the central working chamber 9. Valves 15 and 19 are closed, and 14 and 18 are open. The opening and closing of the valves is facilitated by the inherent gravity and differential pressure of the fluid. Well production from the separation chamber 10, where the production of the well enters and the preliminary separation of oil and gas takes place, passes through the hollow rod 7 to the central working chamber 9, and the gas cap, which has managed to separate from the oil due to gravitational forces, goes on to expanding annular working chamber 11.
Since all the working chambers are interconnected, the expanding annular chamber forcibly sucks the upper gas part of the well production from the central working chamber. As a result, before the injection course, only the liquid part of the well production remains in the cavity of the central working chamber, which leads to a high pump delivery coefficient. This gives reason to use a smaller diameter pump for oil production, thereby reducing the load on the drive part of the pump unit. A reduction in the elastic elongations of the rod string also contributes to an increase in the pump delivery coefficient due to reduced load and the absence of bending of its lower part of the rod string during downward movement, since the polished rod is sealed by passing it through the cylinder sleeve and is a gap seal like a plunger-cylinder pair well pump. The plungers 5 and 6 during the downward stroke do not experience any resistance from the liquid side.
In addition, the absence of free gas in the oil provides good lubrication of the rod string in places of bending and does not cause its wear.
By calculations, we show the possibility of using a gap seal of a polished rod without reducing the pump flow. Liquid leakage through a gap seal is calculated by the formula
Figure 00000002
where k is the coefficient of eccentricity; D is the diameter of the polished rod; Δр - pressure drop at the ends of the seal; δ is the gap between the cylinder sleeve and the polished rod when they are concentric; μ is the viscosity of the fluid. Substituting the numerical values of the parameters that reflect the working conditions of the pair, close to real (k = 1; π = 3.14; D = 30 · 10 -3 m; Δр = 10 MPa; δ = 25 · 10 -6 m; μ = 10 · 10 -3 Pa s; 86400 - the number of seconds in days), we get
Figure 00000003
10 liters of leaks per day is a bit, it is necessary to lubricate the friction pair. The main advantage of this design solution of polished rod seal 8 is the possibility of long-term operation of pumping equipment without lifting to the surface.
When the plungers 5 and 6 move upward, the control valve 18, having a little friction with a polished rod and carried away by the supply of the plunger 5, lifts up and closes the channel 16. As the pressure in the working chamber rises, the pressure valve 15 opens and passes the pump into the lifting column. However, its stroke is limited by the tension of the flexible joint 21 between the valves 15 and 18. At the same time, the valve 18 is pressed more strongly against the opening of the suction channel, providing a more complete tightness of its closing. The conical shape of the valve’s outer surface also contributes to this, and the smaller the taper angle, the more efficiently the pressure force of the liquid presses against the hole. However, reducing the taper angle has a limitation. In order to prevent the valve from jamming in the closed position, the taper angle should be slightly larger than the friction angle (the friction angle is 7–9 degrees) of the contacting surfaces.
The rod string makes its movements in a lifting column filled predominantly with liquid, therefore, the abrasion of pipes and rods in deviated wells is minimal.
During this stroke of the plungers, gas is pumped from the annular chamber into the annulus. Increasing the efficiency of gas injection is achieved by filling the annular chamber with formation water, which plays the role of a liquid piston (plunger). Since hydrocarbon gas does not dissolve in produced water, the entire volume of gas that enters it during suction is displaced from the annular chamber. The volume of water, if there is a flow rate, will be replenished by leaks through the plunger pair of the main liquid pump. These leaks also consist of formation water, since water occupies the bottom of the injected product.
The main liquid pump and auxiliary gas supercharger in this case work in parallel. Mostly, the work is done by the main liquid pump, which feeds the liquid part of the product to the lifting column. When the gas fraction is injected into the annulus, its pressure will be insignificant. Therefore, the load on the drive part of the pump will be determined by the cross section of the upper, smaller in diameter, plunger 5.
Mechanical impurities, mainly sand, due to the location of the discharge valve in the upper part of the pump, prevents sand from entering even if the pump unit stops unexpectedly. The execution of the valve seat in the form of a hemisphere with a flow hole closed by the valve with a flat seating surface makes them contact along one circumferential line, and not along the plane, which eliminates the pinching of sand between them. When the unit stops working, sand does not fall back into the plunger pair and does not cause wear and jamming of the plunger in the cylinder.
All this together increases the efficiency and reliability of the pumping unit, i.e. ability to work for a long time with a high feed rate.

Claims (4)

1. A sucker-rod pumping unit with a two-cylinder pump, including a lifting column of tubing, two pump cylinders and two plungers placed one above the other and connected in series by a hollow rod, mounted on a rod string through a polished rod and installed in cylinders with the formation of the Central and annular chambers, as well as a baffle with a Central passage channel, suction, discharge, check and control valves, characterized in that the seal is polished th rod made slotted and passed through a cylinder bushing, hermetically connected to the discharge valve.
2. Installation according to claim 1, characterized in that the control valve is made in the form of a truncated cone and is connected to the discharge valve through a flexible thread.
3. Installation according to claim 1, characterized in that the saddle of the main discharge valve is made in the form of a hemisphere with a flow hole closed by a valve with a flat seating surface.
4. Installation according to claim 1, characterized in that the annular chamber is filled with formation water.
RU2005114846/06A 2005-05-16 2005-05-16 Sucker-rod pumping unit with two-cylinder pump RU2293216C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2555432C1 (en) * 2014-06-16 2015-07-10 Закрытое акционерное общество "ЭЛКАМ-нефтемаш" Well sucker-rod pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2555432C1 (en) * 2014-06-16 2015-07-10 Закрытое акционерное общество "ЭЛКАМ-нефтемаш" Well sucker-rod pump

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Effective date: 20070517