RU135018U1 - Borehole PUMP PUMP FOR OIL AND GAS PRODUCTION - Google Patents

Borehole PUMP PUMP FOR OIL AND GAS PRODUCTION Download PDF

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RU135018U1
RU135018U1 RU2013128710/06U RU2013128710U RU135018U1 RU 135018 U1 RU135018 U1 RU 135018U1 RU 2013128710/06 U RU2013128710/06 U RU 2013128710/06U RU 2013128710 U RU2013128710 U RU 2013128710U RU 135018 U1 RU135018 U1 RU 135018U1
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Russia
Prior art keywords
plunger
cylinder
pump
valve
oil
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RU2013128710/06U
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Russian (ru)
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Владимир Васильевич Кунеевский
Юрий Николаевич Петрусевич
Дмитрий Витальевич Страхов
Владимир Борисович Оснос
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Владимир Васильевич Кунеевский
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Abstract

1. A downhole sucker rod pump for oil and gas production, comprising a cylinder with a suction valve mounted on the lower end of the pipe string and positioned in the cylinder with the possibility of reciprocating motion and connected by a sucker-rod actuator with a hollow piston with a pressure valve equipped with a channel communicating with the cavity pipe columns at the moment of exiting the cylinder on the approach of the hollow plunger to its upper working position, characterized in that the discharge valve is placed on top of the plunger, which is made of lengths d, longer than the maximum working stroke of the wellhead actuator, the cylinder is equipped with a sealed chamber of a larger diameter with a suction valve at the bottom, while the valves are made with a capacity of at least the capacity of the plunger, and the channel is made in the form of at least one side hole of the plunger located below the discharge valve .2. The downhole sucker rod pump for oil and gas according to claim 1, characterized in that the plunger is equipped with one or more additional openings located below the channel.

Description

The utility model relates to the oil industry and can be used for the operation of producing low-producing wells, including those with a high gas factor, with flooded and / or highly viscous products.
A well-known sucker-rod pump containing a cylinder with a hollow plunger located in it, at the bottom of which a pressure valve is installed, a pump chamber with a suction valve in the lower part, the pump is equipped with a bypass channel with a float valve made with a shut-off float element and located above it a saddle, characterized in that the cylinder is made stepped on the side of the inner surface, the bypass channel with a locking float element is made in the lower part of the lower cylinder stage on the pump chamber, and one channel opening is connected to the upper portion of the pump chamber and the other passage opening is connected to the well (patent RU №2440513, F04B 47/00, publ. 20.01.2010).
The disadvantages of this pump are the difficulty of manufacturing a pump with a side internal valve and a float element, the difficulty of regulation and selection of the float element, low reliability due to a constant change in the composition of the produced products over time and a narrow scope due to the inability of the pump to work for the production of paraffin-tar products deposits and asphaltenes that may adhere to the float element and deactivate the side valve.
A well-known sucker rod pump comprising a cylinder, a self-sealing hollow plunger with a discharge valve made in the form of a valve stem with the possibility of axial movement, and a suction valve in the lower part of the cylinder, characterized in that an additional discharge valve is placed in the upper part of the cylinder, and a suction valve made full bore and normally open, while the valve stem is equipped with a pusher installed with the possibility of interaction with the plunger (patent RU No. 2172866, F04B 47/00, publ. 27.08.2001).
The disadvantages of this deep-well sucker-rod pump are the complexity and cost of manufacturing due to the large number of complex and specific (i.e. small-scale) parts, as well as the complexity of tripping operations, since the cylinder on the pipes and the ram with the rods must be lowered into the well at the same time, which requires the use of a stationary lifting equipment with a lifting height of at least twice the lifting height of mobile units used for tripping operations of standard sucker rod pumps .
A well-known sucker rod pumping unit for the production of liquid and gas, including a casing, a cylinder with a suction valve, where a plunger is installed with the possibility of opening at the end of its upward stroke the bore of the cylinder and a longitudinal channel of variable cross section for communicating the sub-plunger cavity of the cylinder with the internal cavity of the tubing and providing throttling of the separated fluid, characterized in that the plunger is connected to the pump rods by means of an automatic coupler, fishing rod, filter and hollow rod, passed through an internal filter, which is installed in the pipe with emphasis in the cylinder, and when lifting the sucker rods, with emphasis in the plunger, while the inner filter in the lower part has an external protrusion to prevent foreign particles and objects from entering the area of the suction and discharge valves, and the cylinder in the upper part is provided with radial holes, below which at a certain distance there is a throttle hole connected to an internal circular groove intended for unloading the plunger in As a result of its upward stroke from the pressure force of the fluid acting through a throttle hole, the passage section of which is selected by calculation or experimentally in such a way that there are no hydraulic shocks during operation and the necessary quantity of separated liquid is supplied to the subplunger cavity of the cylinder during the movement of the plunger above the throttle hole obtaining in each pumping cycle the maximum filling ratio, while in the lower part of the cylinder through the body of the suction cl the pan is connected to the lower sleeve connected to the external filter with a plug and a casing, which is connected with the upper end to the upper sleeve and pipe by means of a centralizer sleeve, where there is an internal protrusion designed to eliminate lateral movements and center the cylinder in the casing during operation and from the ingress of foreign particles and objects from the internal cavity of the tubing into the area of the suction and discharge valves (patent RU No. 2239052, E21B 43/00, F04B 47/00, publ. 10/27/2004).
The disadvantages of this installation are the complexity and high cost of manufacture due to the large number of concentrically mounted parts with large holes and a large number of holes and small diameters of the cylinder and plunger, which significantly reduces the scope due to the inability to use in high-yield wells, as well as small cross-sections in the valves, which significantly increase the resistance of the fluid flow and, as a result, reduce the coefficient of performance (COP) during production from low-production wells, especially with ovyazkoy and / or Obvodny (80%) product due to formation of the emulsion.
The closest is a borehole sucker pump, consisting of a cylinder with a suction valve mounted on the lower end of the tubing string, located in the cylinder with the possibility of reciprocating movement and connected to the string of pump rods of a hollow plunger with a lower discharge valve, characterized in that the hollow plunger is provided with a longitudinal inner closed channel, the lower end of which is in communication with the sub-plunger cavity of the cylinder, and the upper end with the sub-plunger cavity tubing strings at the moment the upper end of the channel exits the cylinder on the way of the hollow plunger to its upper working position (patent RU No. 2290537, F04B 47/00, published on December 27, 2006).
The disadvantages of this pump are the difficulty in manufacturing the installation inside the plunger of a longitudinal internal closed channel, as well as small throughput sections in the valves, which significantly increase the resistance to fluid flow and, as a result, reduce the efficiency when producing from low-production wells, especially with high viscosity and / or flooded (more than 80 %) products due to the formation of an emulsion.
The technical task of the proposed utility model is to create a simple and cheap borehole sucker rod pump for oil and gas production with high efficiency and low resistance for the flow of liquid and gas in its entire structure.
The technical problem is solved by a borehole sucker rod pump for oil and gas production, comprising a cylinder with a suction valve mounted at the lower end of the pipe string and arranged in the cylinder with the possibility of reciprocating movement and connected by a rod with a wellhead drive with a hollow plunger with a pressure valve equipped with a channel in communication with cavity of the pipe string at the moment of exit from the cylinder on the approach of the hollow plunger to its upper working position.
What is new is that the discharge valve is placed on top of the plunger, which is made longer than the maximum working stroke of the wellhead drive, the cylinder is equipped with a sealed chamber of a larger diameter with a suction valve at the bottom, while the valves are made with a capacity of at least the capacity of the plunger, and the channel is made at least one side hole of the plunger located below the discharge valve.
Also new is the fact that the plunger is equipped with one or more additional openings located below the channel.
The drawing shows a schematic diagram of a pump.
The downhole sucker rod pump comprises a cylinder 1 with a suction valve 2 connected to a pipe string 3, a plunger 4 with a discharge valve 5 connected by a sucker rod 6 to a wellhead drive (not shown in the drawing). The discharge valve 5 is placed on top of the plunger 4, which is made with a length L1 of greater length L (not shown in Fig. 1) - the maximum working stroke of the wellhead drive. The cylinder 1 is equipped with a sealed chamber 7 of a larger diameter at the bottom, in the lower part of which a suction valve 2 is installed. Valves 2 and 5 are made with a throughput of at least the throughput of the cavity of the plunger 4 to reduce the resistance to the flow of the pumped liquid. In this case, the plunger 4 is equipped with a channel 8 made in the form of radial holes 8 and communicating with the cavity of the pipe string 3 at the time of exit from the cylinder 1 at the approach of the hollow plunger 4 to its upper working position.
Downhole sucker rod pump operates as follows.
Before the descent, the pump parameters are determined: the inner diameter D c (to hell, not shown) of the cylinder 1, which provides the cross-sectional area S c of the cylinder 1 (for small wells, especially with complex production of the formation or formations, cylinders 1 are chosen to reduce the load on the rods 6) with a minimum S c and a length of L2, it is recommended that at least 1 m), under which a plunger 4 with an inner diameter providing a cross-sectional area S is selected, productivity, the length of the working path L of the wellhead drive is selected from the well productivity and the number of its reciprocating translations in a period of time. The performance of the pump Q is determined by the following formula:
Figure 00000002
where Q is the pump capacity per hour, m 3 / hour;
n is the frequency of operation of the wellhead drive, 1 / hour;
η is the efficiency of the pump;
Q x - pump capacity for one reciprocating movement of the plunger 4, m 3 / n.
The performance of the pump for one reciprocating movement Q x of the plunger 4 is determined by the formula:
Figure 00000003
where Q x - pump capacity for one reciprocating movement of the plunger 4, m 3 / n;
n is the frequency of operation of the wellhead drive, 1 / hour;
S c - the internal cross-sectional area of the cylinder 1, m 2 ;
L is the length of the stroke of the wellhead drive, m;
N D - internal diameter of the cylinder 1, m.
The field of which is selected by the length L1 of the plunger 4, which must be at least the maximum stroke length L of the wellhead drive (L1> L) in order to maintain the pump operability. To maintain the tightness of the connection of the plunger 4 with the cylinder 1 and to eliminate excessive metal consumption of the structure, the length L1 of the plunger 4 is recommended to be taken from the formula:
Figure 00000004
where L1 is the recommended length of the plunger 4, m;
L is the length of the working wellhead drive, m
When the length L1 of the plunger 4 is longer than the length L2 of the cylinder 1 (L1> L2), the length L1 of the plunger 4 can be calculated by the formula:
Figure 00000005
where L1 is the recommended length of the plunger 4, m;
L is the maximum length of the working wellhead drive, m;
L2 - cylinder length 1, m.
The length L3 of the chamber 7 from the lower edge of the cylinder 1 to the suction valve 2 when the length L2 of the cylinder 1 is greater than the length L1 of the plunger 4 (L2> L1) is chosen equal to save materials:
Figure 00000006
where L3 is the recommended length of the chamber 7 from the lower edge of the cylinder 1 to the suction valve 2, m
If the length L1 of the plunger 4 is longer than the length L2 of the cylinder 1 (L1> L2), the length L3 of the chamber 7 is selected at least the length L1 of the plunger 4 without the length L2 of the cylinder 1 (L≥L1-L2). The length L3 of the chamber 7 is calculated by the formula:
Figure 00000007
where L3 is the recommended length of the chamber 7 from the lower edge of the cylinder 1 to the suction valve 2, m;
L1 - the length of the plunger 4, m;
L2 - cylinder length 1, m.
To ensure minimal resistance to the flow of fluid pumped through the pump, it is necessary that the flow resistance at all points of the pump be no less than the flow resistance in plunger 4. The main indicator of flow resistance is the cross-sectional area of the product pipeline.
For the base, we take the cross-sectional area S of the plunger 4, determined by the formula:
Figure 00000008
where S is the cross-sectional area of the inner cavity of the plunger 4, mm 2 ;
D PL - the diameter of the inner cavity of the plunger 4, mm
Based on the cross-sectional area S of the plunger 4, we select the discharge valve 5. For this, the cross-sectional area S2 of the valve seat 5 is determined, which should be not less than the cross-sectional area 8 of the plunger 4:
Figure 00000009
where S is the cross-sectional area of the inner cavity of the plunger 4, mm 2 ;
S2 is the cross-sectional area of the valve seat 5, mm 2 ;
D SNK - diameter of the seat of the discharge valve 5, mm
Based on formulas (7 and 8) that the inner diameter D of the plunger 4 pl and the diameter of the seat D SNK valve 5 correspond to the following parameter:
Figure 00000010
Based on these parameters, a pressure valve 5 is selected, the casing 9 of which through the sub (not shown in Fig.) Is fixed on top to the plunger 4, and the total area S3 of the output channels 10 should be not less than the cross-sectional area S of the inner cavity of the plunger 4:
Figure 00000011
where S3 is the total area S3 of the output channels 10, mm 2 ;
S is the cross-sectional area 8 of the inner cavity of the plunger 4, mm 2 .
Then determine the internal cross-sectional area S tr of the pipe string 3 in the movement zone of the valve body 9; based on their cross-sectional area S to the valve body 9 and the cross-sectional area S of the plunger 4:
Figure 00000012
where S Tr - the internal cross-sectional area of the pipe string 3, mm 2 ;
S to - the outer cross-sectional area of the housing 9 of the valve 5, mm 2 ;
S is the cross-sectional area of the inner cavity of the plunger 4, mm 2 .
The internal cross-sectional area S tr of the pipe string 3 is determined from the formula:
Figure 00000013
where S Tr - the internal cross-sectional area of the pipe string 3, mm 2 ;
D Tr - the inner diameter of the pipe string 3, mm
The external cross-sectional area S to the valve body 9 is determined from the formula:
Figure 00000014
where S to - the outer cross-sectional area of the housing 9 of the valve 5, mm 2 ;
D to - the outer diameter of the housing 9 of the valve 5, mm
Based on the formulas (6, 7 and 8), we determine the internal diameter D tr pipe string 3:
Figure 00000015
where D Tr - the inner diameter of the pipe string 3, mm
D to - the outer diameter of the housing 10 of the valve 5, mm
D PL - the diameter of the inner cavity of the plunger 4, mm
Based on these parameters, choose pipe pipe string 3 to lower the cylinder 1 into the well.
Similarly, the suction valve 2 is selected (valve body 2 to a diagram, not shown) and the inner and outer diameters of the chamber 7 of cylinder 1. It is possible that the valves 2 and 5 will be of the same size as the pipes for the pipe string 3 and chamber 7
Having determined the parameters of cylinder 1, plunger 4, valves 2 and 5, chamber 7 and pipe string 3, the pump is assembled. A chamber 7 with a suction valve 2 is attached from below to the cylinder 1 with observance of the length b3 (for example: using a sub, not shown in the diagram, and fixed in the right place outside the cylinder 1). The cylinder 1 on the pipe string 3 is lowered into the well (to hell, not shown) in the installation interval. After that, the plunger 4 with the discharge valve 5 is attached to the rods 6, on which they are lowered into the pipe string 3, previously fixed at the wellhead, the interaction of the body sub 9 of the valve 5 with the upper edge of the cylinder 1, which is fixed on the wellhead on the weight indicator (on Fig. not shown) in the form of reducing the weight of the rods 6. After which the wellhead is sealed with wellhead fittings (not shown in Fig.), the rod string is lifted (5-20 cm to exclude shock loads on cylinder 1 from interaction with the housing sub 9 When the reciprocating movement of rods 6) and connected to the wellhead to drive the lower dead point.
The wellhead drive is launched and it transfers the reciprocating movement to the rods 6 and plunger 4. When the plunger 4 moves up and hermetically moves along cylinder 1, a vacuum is created in chamber 7, pressure valve 5 closes, suction valve 2 opens and fluid flows from the well in the chamber 7, while in the upper part of the chamber 7 and inside the plunger 4, gas released from the production can accumulate. After the holes 8 exit from the cylinder 1, gas from the chamber 7 and below the upper edge of the holes 8 will enter the cavity of the pipe string 3, and the liquid under the action of the liquid column will enter through the holes 8 into the cavity of the plunger 4, cylinder 1 and chamber 7, while the suction valve is closed under the action of the liquid column of the pipe string 3, and above the upper edge of the holes 8, the gas is compressed with the force of the liquid column of the pipe string 3. When the plunger 4 moves downward in the chamber 7 and cylinder 1, excess pressure is created, the gas in the plunger 4 is compressed exceeding the force of the liquid column to the pipe string 3 and the pressure valve 5 opens, gas from the plunger 4 and fluid from the chamber 7 and the cylinder 1 flows into the pipe string 3. With a constant reciprocating movement of the plunger 4 relative to the cylinder 1 and the chamber 7, fluid and gas from the well flows into the pipe string 3, which rises to the surface.
With a very large amount of gas in the produced product or in wells with a depth of more than 1000-1500 m, one or more additional openings 11 located below the opening 8 can be made in the plunger 4 to ensure a constant flow of gas accumulated in the upper part of the chamber 7 from the chamber 7 into the plunger 4 when it moves up to the exit of the hole 8 from the cylinder 1. After the exit of the hole 8 from the cylinder 1, gas from the plunger 4 and below the upper edge of the holes 8 will enter the cavity of the column 3, excluding the gas being blocked by the flow of fluid flowing and from the pipe string 3 to the chamber 7 through the openings 8, in the chamber 7, thereby increasing the working volume of the cylinder 1 and the chamber 7 and, as a consequence of the pump efficiency, during its operation. When tested in comparison with standard sucker rod pumps (see GOST R 52896-2002) of the same plunger diameter, the efficiency increase was 3-7%, 8-14% when working in bituminous oil, and up to 80% when working with highly carbonated oil . The remaining operations of the pump are described above.
Since cylinder 1 and plunger 4 of small diameter are used in this pump design, and the throughput of valves 2 and 5 is not less than the throughput of plunger 4 (i.e., fluid flow resistance is the minimum possible for a given plunger pair: cylinder 1 - plunger 4), this design allows you to work effectively in low-yield wells with maximum efficiency, including for the production of complex products, waterlogged oil and / and products with a high gas content due to minimal resistance to fluid flow.
This design of a well sucker-rod pump for oil and gas production allows working efficiently in low-yield wells with maximum efficiency, including for the production of complex products, waterlogged oil and / and products with a high gas content due to the minimum resistance to liquid and gas flow.

Claims (2)

1. A downhole sucker rod pump for oil and gas production, comprising a cylinder with a suction valve mounted on the lower end of the pipe string and positioned in the cylinder with the possibility of reciprocating motion and connected by a sucker-rod actuator with a hollow piston with a pressure valve equipped with a channel communicating with the cavity pipe columns at the moment of exiting the cylinder on the approach of the hollow plunger to its upper working position, characterized in that the discharge valve is placed on top of the plunger, which is made of lengths d, longer than the maximum working stroke of the wellhead drive, the cylinder is equipped with a sealed chamber of a larger diameter with a suction valve at the bottom, while the valves are made with a capacity of at least the capacity of the plunger, and the channel is made in the form of at least one lateral hole of the plunger located below the discharge valve .
2. A well sucker rod pump for oil and gas production according to claim 1, characterized in that the plunger is equipped with one or more additional holes located below the channel.
Figure 00000001
RU2013128710/06U 2013-06-24 2013-06-24 Borehole PUMP PUMP FOR OIL AND GAS PRODUCTION RU135018U1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103603791A (en) * 2013-12-10 2014-02-26 四川澳维采油设备有限公司 Hollow oil well pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103603791A (en) * 2013-12-10 2014-02-26 四川澳维采油设备有限公司 Hollow oil well pump
CN103603791B (en) * 2013-12-10 2015-12-30 四川澳维采油设备有限公司 A kind of hollow oil-well pump

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Effective date: 20140625