RU2654559C1 - Sucker rod piston pump - Google Patents

Sucker rod piston pump Download PDF

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Publication number
RU2654559C1
RU2654559C1 RU2017128347A RU2017128347A RU2654559C1 RU 2654559 C1 RU2654559 C1 RU 2654559C1 RU 2017128347 A RU2017128347 A RU 2017128347A RU 2017128347 A RU2017128347 A RU 2017128347A RU 2654559 C1 RU2654559 C1 RU 2654559C1
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RU
Russia
Prior art keywords
piston
cylinder
pump
pair
valve
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RU2017128347A
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Russian (ru)
Inventor
Рустем Феликсович Юсупов
Рашит Мухаметшакирович Абдулхаиров
Феликс Исмагилович Юсупов
Азат Шамилевич Шаяхметов
Original Assignee
Общество с Ограниченной Ответственностью "Региональный научно-технологический центр Урало-Поволжья" ООО "РНТЦ Урало-Поволжья"
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Priority to RU2017128347A priority Critical patent/RU2654559C1/en
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Publication of RU2654559C1 publication Critical patent/RU2654559C1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps

Abstract

FIELD: oil and gas industry.
SUBSTANCE: invention relates to the field of operation of an oil well by the artificial lift production method, in particular to sucker rod piston pumps for the production of oil with a high content of mechanical impurities, sand and viscous oil from the well. Pump includes a cylinder with a hollow plunger lowered on the tubing string, a suction and discharge valve. Pump cylinder is installed between the pipes of tubing and connected to them by adapters – upper and lower. Pump is additionally equipped with two piston pairs – upper and lower. Upper piston pair is mounted inside the plunger connected to its cylinder at the bottom on the thread so that they are at different levels in height and length. Piston is provided with a cover with a connecting member with a rod and an outer annular protrusion at the lower end, with which the cylinder is engaged when the piston moves upward. In the wall of the piston and its cylinder, windows are made at different levels in height in the longitudinal direction with the same geometric dimensions, which are combined when the piston is in the lowest position, forming a discharge valve. Lower piston pair is installed in the lower part of the pump cylinder with similarly formed windows in the wall of the piston and its cylinder forming the suction valve when aligned, when the piston of this pair is in the upper position. Upper end of the piston cylinder of the lower piston pair is stepped and threaded to the lower adapter. Piston is plugged from below and spring-loaded. For engagement with the end of the upper piston with a ring protrusion, piston is provided with an annular permanent magnet mounted on its upper end abutting on the protrusion of the cylinder on which a washer made of dielectric material is mounted to reduce the effect of the magnet on it.
EFFECT: pump has high operational reliability and performance, allows to increase the inter-repair period of the well.
1 cl, 4 dwg

Description

The invention relates to the field of operation of an oil well in a mechanized way, in particular to rod deep piston pumps for oil production with a high content of mechanical impurities, sand and viscous oils from the well.
Known sucker rod pump for pumping oil from the well (see patent RU No. 2369775, IPC F04B 47/00, publ. 10.10.2009, Bull. No. 28, under the name "Well sucker rod pump").
The known pump comprises a cylinder with a suction ball valve at the bottom. Inside the cylinder mounted on the tubing string, a hollow plunger with a discharge ball valve is installed with the possibility of reciprocating movement from the actuator to the surface through the rod string. The pump is equipped with a lubricating oil tank and a plunger-cylinder pair lubrication system.
The disadvantage of this pump is the design complexity, low-tech manufacturing. Lubricating the rubbing surface of a plunger-pump pair partially eliminates their wear and can increase the overhaul period. However, when pumping heavily contaminated oil containing mechanical impurities such as proppant, rubber elements from sealing elements, sand, as well as highly viscous oils, asphalt-resin-paraffin deposits (AFS), their tightness is broken on ball valves and 100% operation is not ensured. Since the opening and closing of the valve is carried out only due to the weight of the liquid column and the weight of the valve itself and if there is a ball - seat of mechanical impurities in the pair, an annular gap is formed between them, which does not allow the valve to close tightly, which is the reason for the leakage of liquid. This leads to lower pump performance and requires repair work.
Also known is a sucker rod pump for pumping oil from a well (see patent RU No. 2436996, IPC F04B 47/00, published on December 20, 2011 Bull. No. 35, under the name "Double-acting sucker rod pump").
It contains a cylinder with a hollow plunger installed inside, suction and discharge ball valves, while the third discharge valve is made in the form of a sleeve for which on the ledge of the sub connecting the pipe string to the cylinder made stepwise, forming a poppet valve, the lower stage of the cylinder is made with a larger diameter than the upper step. A valve in the form of a sleeve is mounted on the rod with the possibility of longitudinal movement on it upward with excess pressure in the sub-plunger cavity.
Known sucker rod pump, similar in technical essence, and can be adopted as a prototype.
This pump partially increases its productivity, however, and it is not without drawbacks. Thus, the implementation of the suction and discharge valves in the form of a ball-seat pair and the execution of one of the poppet discharge valves do not always ensure complete tightness, which negatively affects its performance. This is explained by the fact that the produced well products contain mechanical impurities such as proppant, sand of various fractions, rubber particles from the pump's sealing elements, which, when deposited together with viscous oil and paraffin deposits on the contacting surfaces of the ball-seat pair, lead to mismatch during pump operation with their geometric shapes and, consequently, to incomplete seating of the ball and plate on the saddle, which leads to a loss of tightness due to the formed gap. The tightness of the valve of this design is also reduced with the slightest wear and corrosion of the aggressive environment in the well. In addition, ball valves lose their tightness, i.e. they do not work either in directional wells, where the wellbore curvature is more than 50 degrees in the zenith angle, and in horizontal wells in which the pump is in the position of 90 degrees in the zenith angle, in which the valve is closed only due to the weight of the liquid column, and the weight of the locking element itself is not involved in the closure.
The technical task of the present invention is to increase the performance of the sucker rod pump and the overhaul period of operation.
The stated technical problem is solved by the described sucker rod piston pump, which includes a cylinder with a hollow plunger installed inside the tubing, a suction and discharge valve.
What is new is that the pump cylinder is installed between the tubing and connected to them by adapters - upper and lower, while the pump is additionally equipped with two piston pairs (piston - cylinder) - upper and lower, the upper piston pair is installed inside the plunger connected to its cylinder in the lower part on the thread so that they are at different levels in height and length, and its piston is equipped with a cap with a connecting element with a rod and an outer annular protrusion at the lower end, with which the cylinder when the piston moves up, while in the wall of the piston and its cylinder there are windows at different levels in height in the longitudinal direction with the same geometric dimensions, compatible when the piston is in its lowest position, forming a pressure valve, while the lower piston pair installed in the lower part of the pump cylinder with similarly made windows in the wall of the piston and its cylinder, as in the upper piston pair, forming a kind of suction valve when aligned when the piston of this pair is in the upper position, and the upper end of the cylinder of the said piston of the lower piston pair is made stepwise and connected to the lower adapter on the thread, and its piston is muffled and spring-loaded from below, and for interaction with the end face of the upper piston with an annular protrusion is equipped with an annular permanent magnet mounted on its upper the end resting on the ledge of the cylinder on which a washer of dielectric material is mounted to reduce the effect of the magnet on it.
An analysis of the known technical solutions in this technical field, conducted by the TatNIPIneft Institute patent fund with a retrospective of 20 years in order to determine the technical level, showed that the claimed technical solution has features that are not in the analogues, and their use, in the claimed combination of essential features, allows to obtain a new technical result, which consists in increasing the productivity of the pump, the reliability of its operation and, as a consequence, the increase in the overhaul period. Therefore, we can assume that the claimed technical solution meets the conditions of patentability "novelty" and, in our opinion, the criterion of "inventive step".
The presented drawings explain the essence of the invention, where in FIG. 1 shows the proposed piston pump on a rod string, lowered into the well, in a longitudinal section, the pump cylinder with a plunger is visible, the position of the pistons after its descent relative to their cylinders, a permanent magnet screwed to the upper end of the lower piston, and a spring to return it to lower position.
In FIG. 2 is the same as in FIG. 1, when the upper piston, with the help of a column of rods, rises upward, entraining the lower piston due to the magnet and compressing the spring, in which the windows of the upper piston and its cylinder are partially offset from each other, and the windows at the lower piston are aligned with the windows of its cylinder, which occurred the absorption of the borehole product and its injection by the plunger into the pipe space, in a partial longitudinal section.
In FIG. 3 is the same as in FIG. 2, when the upper piston occupied the highest upper position during the upward stroke of the rod, while the windows of the upper piston pair are at a different level, and by this moment the piston of the lower piston pair, having come off from the upper piston under the action of a spring, the weight of the piston and the fluid in it, has lowered down and took its starting position, in partial longitudinal section.
In FIG. 4 is the same as in FIG. 3, when the upper piston reached the end of its cylinder during the stroke of the rod and the end of the cap began to move the cylinder and the associated plunger down.
The sucker rod piston pump (see Fig. 1-4), lowered on the tubing string, includes a cylinder 1 with a plunger 2, installed between the tubing 3 and 4, and connected to them using adapters 5 and 6, the upper and lower . Inside the plunger 2, the upper piston pair is installed - the piston 7 and cylinder 8, connected to the plunger 2 on the thread, and inside the pipe 4 of the tubing is installed the lower piston pair - the piston 9 and cylinder 10, the upper part of which is made stepwise and connected to the lower adapter 6 on the thread . The piston 9 is spring-loaded from below using a spring 11 mounted on the plug 12 screwed to its lower end, and a permanent magnet 13 is screwed onto its upper end, abutting against the step 14 of the cylinder 10. To reduce the action of the magnet, a washer 15 made of dielectric material is installed on the step. As can be seen from FIG. 1, 3 and 4, the piston 9 from falling to the bottom is held on the ledge 14 by the end face of the magnet, resting on the washer 15. In the walls of the piston 9 and cylinder 10 of the lower piston pair at different levels in height in the longitudinal direction with the same geometric dimensions, windows 16 and 17, respectively, compatible during operation, in particular when the piston 9 is in the upper position (see FIG. 2), forming a suction valve.
The piston 7 of the upper piston pair, lowered on the rod string 18, is provided with a cover 19 with a connecting element for the rod (the connecting element is not shown in FIG.), And its lower end is provided with an outer annular protrusion 20, with which the lower end of the cover 19 can interact cylinder 8 with reciprocating piston. Similarly to the windows 16 and 17 of the lower piston pair, in the upper piston pair, windows 21 and 22 are made in the walls of the piston 7 and cylinder 8, respectively, which are compatible during operation, in particular when the piston 7 is in its lowest position (see Fig. 1) forming a discharge valve.
The pump operates as follows.
As part of the tubing string, the pump cylinder 1 is first lowered into the well (see Fig. 1) with the lower piston pair assembled to the required depth in the zone of the reservoir (the well and reservoir are not shown), at which its piston 9 is located at the end of the descent the lower position and the windows 16 and 17 are open, its upper end with a magnet 13 rested on the washer 15 of the ledge 14 of its cylinder 10. Then, on the rod string 18 connected to the ground drive (the drive is not shown), the upper piston pair with the plunger 2 is lowered into collection to the end of its piston 7 with an annular Stupa 20 on the upper end of the piston 9 to the magnet 13 of the lower piston pair, in which the windows 16 and 17 are at different levels. After adjusting the stroke length of the rod, the pump is ready to feed the well products to the surface and then through the pipes to the oil gathering point.
Next, the rod string drive is included in the operation, in which the rod 18 with the piston 7 begin to move up (see Fig. 2), hooking the lower piston 9 due to the action of the magnet 13 and compressing its spring 11, and then begins to move upward with its annular protrusion 20 cylinder 8 with a plunger 2, under which a vacuum is created, which has a significant effect in lifting up the lower piston 9 mentioned above, in overcoming the resistance of the spring during compression, the weight of the liquid in the piston cavity, and also the weight of the piston itself. When moving the rod 18 with the piston 7 upward, the windows 16 and 17 of the lower piston pair gradually begin to combine, and under the action of the vacuum created under the plunger 2 and the upper piston pair, the formation products are sucked in and at the same time pumping it through partially displaced windows 21 and 22 of the upper piston pairs, as well as feeding it with a plunger along the tubing to the surface. Upon reaching the rod 18 with the piston 7 of the upper point, the windows 16 and 17 of the lower piston pair are fully combined (see Fig. 2), and the windows 21 and 22 of the upper piston pair are at different levels, the injection of the well production by the plunger has stopped, therefore, the formation the vacuum underneath stops. At this moment, the lower piston 9 with the magnet 13 is detached from the upper piston pair and, due to the force of the compressed spring, tending to open, dropping down, takes its initial position (see Figs. 3 and 4), closing the lower valve, i.e., windows 16 and 17, while at different levels. Meanwhile, the rod 18 with the piston 7 begins to move down and, reaching the end of its cylinder, the end of the cap begins to move the cylinder and the associated plunger down, in which the windows 21 and 22 of the upper piston pair begin to gradually align (see Fig. 3 and 4 ), the injection of fluid through them into the tubing space of the tubing begins. When the rod with the piston approaches the lower position, these windows are fully aligned (see Figs. 2 and 1). Next, the cycle repeats.
The piston pair valves for the sucker rod pumping equipment (SHG) of the proposed design were developed as an alternative valve to replace the valves existing today, such as ball, poppet, poppet and spool valves. The use of various pushers for forced closing of valves in borehole conditions in the presence of mechanical impurities and the design features of the valves also do not always ensure complete valve tightness or the operation of SHGN can be short-lived.
The proposed pump with piston pair valves for SHGN have a number of advantages over such valves:
- can work reliably in any wells and with any inclination of its trunk, for example, with an zenith angle exceeding more than 50 degrees, and a horizontally directed shaft with anti-aircraft angles of 90 degrees. A significant drawback of all of the above valves is that the valves open and close due to the weight of the liquid column and the weight of the valve itself, where the weight of the valve for closing is possible in wells only up to 50 degrees at the zenith angle, and with more than 50 degrees the value of the weight of the valve for closing does not play a role and closure is due to the weight of the liquid column. But, given the fact that in downhole conditions there are mechanical impurities such as proppant, rubber elements from the sealing units, sand, emulsion, high viscosity of oil, paraffin, etc., there is a problem in ensuring the tightness of the valve, i.e. closing the valve due to the weight of the liquid column does not always ensure the tightness of the SHGN, since there is no two-way supply and pressure testing of the SHGN, as provided for in the proposed pump.
The operation of the piston pair valve, which provides 100% opening and closing, is associated with the design feature of the piston pair valve, where the opening and closing occur in two parallel planes (see the drawings), by moving one plane in relation to the other in direct the contact of two planes, thereby creating the effect of "scissors". This effect of "scissors" when closing the valve, i.e. reciprocating movement of the plunger, allows you to cut off all kinds of mechanical impurities that fell between the two contact planes of the piston valve up to small metal elements commensurate with the size of the window of the piston pair, and thereby provides a 100% valve closure. When the valve is opened, mechanical impurities are cleaned due to the movement of the extracted fluid (product) from the well. In standard valves, the ball and plate are seated on the seat, and in the presence of mechanical impurities, the tightness is violated, even under condition of forced closure, as tightness is ensured only when the ball and plate are fully seated on the seat, and in the presence of mechanical impurities, an annular gap remains, which does not allow the valve to close even by forced closure.
The technical and economic advantage of the proposal consists of the following.
Due to the reliable operation of the pump, the overhaul period of the well increases, which will lead to time and material savings, as well as to a reduction in labor resources. In addition, one of the advantages of a piston pair valve is that it performs the function of a counter-collar coupling, which eliminates the possibility of a plunger flap during operation of the SHGN, while changing the geometric dimensions of the windows that make up the valve during operation allows you to increase the throughput of the well production, therefore increase pump performance. This pump can be used with a long rod stroke of up to 20 meters or more.

Claims (1)

  1. Deep-well piston pump, which includes a cylinder that is lowered on a tubing string with a hollow plunger installed inside, a suction and discharge valve, characterized in that the pump cylinder is installed between the tubing and connected to them with adapters - upper and lower, while the pump additionally equipped with two piston-piston-cylinder pairs - the upper and lower, the upper piston pair is installed inside the plunger connected to its cylinder in the lower part on the thread so that they find they are at different levels in height and length, and its piston is equipped with a cap with a connecting element with a rod and an outer annular protrusion at the lower end, with which the cylinder interacts when the piston moves upward, while windows are made at different levels in the piston wall and its cylinder height in the longitudinal direction with the same geometric dimensions, combined when the piston is in its lowest position, forming a pressure valve, while the lower piston pair is installed in the lower part of the pump cylinder with anal windows made in the wall of the piston and its cylinder, as well as that of the upper piston pair forming the suction valve when aligned when the piston of this pair is in the upper position, the upper end of the cylinder of the piston of the lower piston pair being made stepwise and connected to the lower adapter and its piston is muffled and spring-loaded from below, and for interaction with the end face of the upper piston with an annular protrusion, is equipped with an annular permanent magnet mounted on its upper end, abutting against a cylinder ledge and on which a washer of a dielectric material to reduce it to the action of the magnet.
RU2017128347A 2017-08-08 2017-08-08 Sucker rod piston pump RU2654559C1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU189401U1 (en) * 2018-11-07 2019-05-21 Чертенков Михаил Васильевич ROD WELL PUMP DOUBLE ACTION
RU2696837C1 (en) * 2018-06-01 2019-08-06 Общество с ограниченной ответственностью "Региональный научно-технологический центр Урало-Поволжья", ООО "РНТЦ Урало-Поволжья" Sucker-rod subsurface piston pump

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464347A (en) * 1945-03-30 1949-03-15 Elmer L Roofe Deep well pump
US4332553A (en) * 1981-01-30 1982-06-01 Sybron Corporation Vacuum firing porcelain furnace
RU2096660C1 (en) * 1995-09-26 1997-11-20 Внедренческий научно-исследовательский инженерный центр "Нефтегазтехнология" Sucker-rod well pump
RU2369775C1 (en) * 2008-08-06 2009-10-10 Ривенер Мусавирович Габдуллин Sucker-rod pump of well
RU2436996C1 (en) * 2010-09-27 2011-12-20 Владимир Васильевич Кунеевский Bottom-hole oil pump of double action

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464347A (en) * 1945-03-30 1949-03-15 Elmer L Roofe Deep well pump
US4332553A (en) * 1981-01-30 1982-06-01 Sybron Corporation Vacuum firing porcelain furnace
RU2096660C1 (en) * 1995-09-26 1997-11-20 Внедренческий научно-исследовательский инженерный центр "Нефтегазтехнология" Sucker-rod well pump
RU2369775C1 (en) * 2008-08-06 2009-10-10 Ривенер Мусавирович Габдуллин Sucker-rod pump of well
RU2436996C1 (en) * 2010-09-27 2011-12-20 Владимир Васильевич Кунеевский Bottom-hole oil pump of double action

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2696837C1 (en) * 2018-06-01 2019-08-06 Общество с ограниченной ответственностью "Региональный научно-технологический центр Урало-Поволжья", ООО "РНТЦ Урало-Поволжья" Sucker-rod subsurface piston pump
RU189401U1 (en) * 2018-11-07 2019-05-21 Чертенков Михаил Васильевич ROD WELL PUMP DOUBLE ACTION

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Effective date: 20190809