RU2333387C2 - Multiplier-type power driving unit for oil field plant - Google Patents

Multiplier-type power driving unit for oil field plant Download PDF

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RU2333387C2
RU2333387C2 RU2006124363/06A RU2006124363A RU2333387C2 RU 2333387 C2 RU2333387 C2 RU 2333387C2 RU 2006124363/06 A RU2006124363/06 A RU 2006124363/06A RU 2006124363 A RU2006124363 A RU 2006124363A RU 2333387 C2 RU2333387 C2 RU 2333387C2
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multiplier
piston
pump
driving unit
drive
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RU2006124363/06A
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Russian (ru)
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RU2006124363A (en
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Александр Федорович Чугунов
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Александр Федорович Чугунов
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Abstract

FIELD: petroleum industry.
SUBSTANCE: unit is intended for application in the oil production industry for lifting formation fluid on the surface and relates to power equipment of oil field plants. The driving unit contains the driving piston - type hydraulic cylinder connected with the working multiplier to form a single structure. The driving unit also contains the accumulating multiplier, connected to the driving hydraulic cylinder to form 3D enclosed structure that operates basing on the principle of communicating vessels. The accumulating multiplier performs the function of equalising weight and at the same is used as a vessel for compressed air and liquid for re-using these agents in operation of the driving unit. Hydrostatic overpressure generated by the working multiplier, is transferred through the liquid to the piston of the driving hydraulic cylinder, which by the hydrostatic force via the flexible link drives the piston of the deep-well oil pump. The driving unit makes it possible to exclude counterweights out of the kinematical connection between the pump and the power driving unit.
EFFECT: possibility to exclude counterweights out of the kinematical connection between the pump and the power driving unit.
2 cl, 12 dwg

Description

The invention relates to the field of engineering, and more particularly to power equipment of oilfield installations, and can be used in the oil industry when lifting formation fluid to a surface with a wide range of depths of oil reservoirs, while it can ensure the operation of the installation regardless of the physicochemical properties of the liquid .
Universal systems for lifting and collecting oil products do not exist, since each field has its own characteristics.
Known oilfield installations for oil production contain well pump volumetric action and their drives. A.G. Molchanov, V.L. Chicherov. “Oilfield Machines and Mechanisms”, Moscow, “Nedra”, 1983, Chapter I and dynamic pumps, Chapter II.
The most common method for operating oil wells is a method using a well pump with a drive located on the surface. Over 70% of the existing well stock is equipped with sucker-rod pumping units (hereinafter referred to as SHSNU). Using SHSNU produced 30% of all oil.
The scope of SHSNU in most cases corresponds to a supply of up to 30-50 m 3 / day, with a pump suspension depth of 1000-1500 m and in some cases up to 3000 m. With deep wells, the installation weight increases, which negatively affects the cost, complicates maintenance and repair both ground and underground parts.
The large mass of the installation necessitates the construction of an expensive and time-consuming foundation for it. One of the critical elements of the installation is a rod string operating under the most stressful conditions. The strength and durability of the rods determines the flow of the entire installation and the maximum depth of the pump.
Climbing rods causes downtime and the need for underground repairs. Most often, rod breaks occur in the upper and lower parts of the column (suspension points of the rods and pump). This is due to the fact that in these parts of the rod string, in addition to the static load from the weight of the rods and fluids, dynamic loads from the crank drive mechanism are also acting. The force at the point of suspension of the rods is constantly directed downward and differs, when moving up and down, no more than 50%, which led to the introduction of special devices in the drive design to stabilize the load on the drive motor during the installation working cycle.
The balancing of installations is accompanied by an increase in the number of structures whose task is to convert the rotational motion of a high-speed engine into a slow reciprocating motion of the boom suspension point. The vast majority of SHSNU is driven by balancing drives with cargo, rotary or combined balancing. One of the ways to simplify the rocking machine, to reduce its mass is to refuse to use the balancer and implement unbalanced rocking machines.
A hydraulic rod drive unit is also known using, as a balancing load, tubing string (“Oilfield Machines and Mechanisms”, p. 73, Fig. 1.43).
The hydraulic drive unit has the following main components.
Power body - hydraulic cylinder, rod string, borehole pump.
The balancing device is a pipe hydraulic cylinder, upper and lower traverses, a tubing string.
Drive - power pump, reversing system.
The cylinder of the borehole pump moves during the working cycle together with the tubing string, and the pump plunger with the rod string.
The method of balancing the tubing string is used in plants of various types - with a mechanical and hydraulic drive, known under the AGN code, and the specifics of their kinematics and dynamics are predetermined by other methods that are different from those used for balancing rocking machines for determining the power supply of a drive motor pump.
In AGN installations, the permissible load on the wellhead rod, depending on the stroke length of the rod suspension point, with respect to the tubing ranges from 30 to 150 kN, which limits the depth of the pump descent.
Closest to the described device is a multiplier power drive containing a drive piston hydraulic cylinder connected to the working multiplier in a single design. (US 4198820 A, 08.21.1978).
Compared with the described, the known device has a complex structure and a small stroke length of the point of suspension of the rods.
The technical problem posed in the present invention is the creation of a universal power drive, which will eliminate the balancing loads from the kinematic connection between the pump and the power drive; apply tackle and tackle equipment, which will provide a large (from 10 to 30 m) stroke length of the boom suspension point while reducing the load on the power equipment.
This task is achieved in that the multiplier power drive containing the drive piston hydraulic cylinder connected to the working multiplier in a single structure, contains a storage multiplier connected to the drive hydraulic cylinder, with the formation of a three-dimensional closed structure, working on the principle of communicating vessels, while the accumulating multiplier performs the function balancing cargo and at the same time serves as a reservoir of compressed air and liquid for their reuse in work when water.
The multiplier is an intermediate link in the power circuit of the equipment and is located between the power plant-compressor and the drive hydraulic cylinder. Accordingly, the large chamber is pneumatic, the small chamber is hydraulic, and the multiplier is pneumohydraulic. During the working cycle, the inlet pressure increases at the outlet - in proportion to the ratio of the areas of the chambers (D / d) 2 .
In order to prevent the formation of a cushioning pad between the air and hydraulic chambers of the multiplier, there is an exit to the atmosphere.
The SHSNU pneumatic-hydraulic drive has a softer engagement of the mechanisms, which makes it possible to simply adjust individual parameters of the double-stroke cycle of the rods and apply the tackle system in the drive of the installation. The drive is switched on smoothly by the switchgear automatically.
Changes in the ground part of the SSNU predetermined changes in the underground part. The rod plunger pump is replaced by a two-chamber piston pump. The well pump is a cylinder with a piston with two chambers: a receiving and a working one. The receiving chamber is isolated from oil in the production well and from the working chamber with blank metal covers that house the suction and discharge valves, and a rod passes through the center, at the end of which the pump piston is fixed. In the pipes of the production well, which pass through the oil reservoir, windows are made through which oil enters the intake chamber of the pump. When the piston moves downward, a suction process occurs, upward - the discharge process. The piston cylinder is plug-in and available for repair by lifting it to the surface.
In the under-piston part of the pump cylinder there is a drainage channel with valves for removing liquid and gas in order to avoid the formation of pillows (plugs) in the lower part of the working chamber.
The described design of the pump has a large zone of influence on the removal of oil from the reservoir, reduces the possibility of the formation of sand plugs, raises any type of reservoir fluid to the surface.
Figure 1 shows a General view of the ground part of an oil well equipped with an unbalanced long-stroke unit with a power drive.
Figure 2 shows the equipment of the surface part of the well using a gear polyspast.
Figure 3 shows a General view of the pumping unit of the oil lifting installation.
Figure 4 shows the design diagram of the power equipment of the rocking machine.
Figure 5 shows a section of an oil well with ground and underground equipment.
Figure 6 shows a section of a two-chamber piston pump.
Figure 7 shows a block diagram of a sucker rod pumping unit.
On Fig shows a three-chamber pressure booster and the principle of its operation.
Figure 9 shows a General view of the two-chamber multiplier.
Figure 10 shows a section of the multiplier.
11 shows an assembly drawing of a multiplier.
On Fig shows a drawing of a piston group of the multiplier.
Unbalanced long-stroke oil-lifting unit - BDNU consists of a metal tower 1 installed at the wellhead 2. A six-stringed stringing system 3 is installed on the upper platform of the tower.
The tackle carriage is connected through the crown blocks by a cable 4 to the wellhead rod 5, the other end of the cable is fixed to the supporting structure of the tower.
The carriage cargo hook is connected to the piston rod 6 of the drive hydraulic cylinder 7.
The camera K-2 and K-4, respectively, of the working 8 and accumulating 9 multipliers is connected to the power (drive) hydraulic cylinder in the over-piston and under-piston areas.
The accumulating multiplier serves as a balancing load and at the same time serves as a reservoir of compressed air and liquid for their reuse in the operation of the installation.
Compressed air from the compressor station 10 through the receiver 11 and the control and distribution equipment 12 is supplied to the chamber K-1. Figure 2 shows the ground part of the installation using gear pulley 13, the cargo hook of which is connected to the piston rod of the drive hydraulic cylinder, and the free end of the cargo cable is connected through the block to the wellhead of the well pump.
All equipment is placed on the supporting lattice portal 14, installed above the wellhead.
Figure 3 shows a General view of the rocking machine, in which the drive cylinder is installed on the wellhead. The remaining mechanisms, with the exception of the pulley system, are similar to the BDNU drive.
In order to remove the cushioning pad between the pneumatic and hydraulic chambers, there is a device 15 with the release into the atmosphere. The air in the pneumatic chambers of the multipliers is fed through ducts 16.
The piston of the drive hydraulic cylinder is connected to the pump piston by a rod string 17.
The piston rod pump 18 consists of a housing 19, in the cylinder of which a rod 20, a piston 21, drain valves 22, a discharge channel 23, a receiving chamber 24 with an external cover 25 and a pressure valve 26, an internal baffle 27 with a suction valve 28 that separates the receiving and the working chamber of the pump. The receiving chamber of the pump is located in the oil reservoir and represents a core structure into which oil enters through the windows 30 of the production string 31.
When the piston moves down, a process of suction and extrusion of fluid through the drain valves 22 from under the piston area of the pump takes place. During the upward stroke of the piston, an injection process occurs. In this case, under the influence of pressure in the working chamber, the suction valve closes and the discharge valve opens. Oil from the working chamber through channel 32 is displaced into the production string of pipes and then enters the field network. The discharge valve is connected to the working chamber of the pump by a channel 32, which passes through the oil reservoir (receiving chamber) and is designed to isolate the latter from the working chamber of the pump and oil in the production tubing string, and also serves as additional rigidity of the pump receiving chamber. There is no pressure on the pump piston from the oil column in the production casing, unlike plunger pumps.
Figure 7 shows a block diagram of a sucker rod pumping unit, in which are indicated: P - drive SHSNU; W - rods; H - pump; T - production string of pipes; PO - auxiliary underground equipment; PP - product reservoir; PS - fishing network.
Multiplier 33 contains large 34 and small 35 chambers, end caps 36 and 37, adapter 38, pistons 39 and 40, rod 41. All assemblies are assembled by threaded connections. Through the plugs, the multiplier is connected to the power mechanisms of the installation.
The multiplier contains a large 39 and a small 40 pistons, a connecting rod 41.
Installation works as follows. Before the start of the working cycle, the pistons of the power hydraulic cylinder and the sucker rod pump are respectively in the upper and lower positions. Half-carriage with a cargo hook at the power hydraulic cylinder. The piston group of the drive cylinder is located at the end of the K-1 and K-2 chambers. The K-2 chamber is filled with liquid, K-1 is free.
The piston group of the accumulating multiplier is located at the power cylinder, the K-3 and K-4 chambers are free.
The work process begins with the air supply to the K-1 chamber from the compressor station. The piston group of K-1, K-2 chambers starts to move towards the drive cylinder under air pressure. The fluid from the K-2 chamber is displaced into the supra-piston region of the drive cylinder and drives the piston of the cylinder. Moving down, the piston, the rod of which is connected to the cargo hook, pulls the cargo rope in conjunction with the wellhead rod of the rod string and the pump piston up.
Under the pressure of oil in the working chamber of the pump, the suction valve closes and the discharge valve opens.
Oil through channel 32 is squeezed into the production casing of the well and then into the production network.
When the drive piston reaches the bottom of the cylinder, and the pump piston reaches the top of the working chamber, the pumping process ends.
At the same time, the liquid is displaced from the power cylinder, fills the chamber K-4 of the accumulating multiplier, forcing the piston group to move to the end of the chamber K-3 and K-4.
The suction process begins with the passage of compressed air from the K-1 chamber to the K-3 chamber. Under the influence of the weight of the rods, the pistons of the drive cylinder and pump, respectively, rise up and release downward. The suction valve opens and the discharge valve closes. Fluid from the master cylinder fills the K-2 chamber, and from the reservoir, the working chamber of the pump. Liquid and gas from the piston part of the pump chamber are extruded through the channel 23 into the productive formation. When the pistons reach the upper and lower points of the cylinder and chamber, the suction process ends.
The work of a three-chamber pressure booster.
If pressure K-1 is created in chamber K-1, then hydrostatic pressure in chamber K-2 must satisfy the conditions:
P 2 W 2 = P 1 W 1 , then
Figure 00000002
where W 1 and W 2 - the area of the pistons in the chamber K-1 and K-2.
Chambers K-2 and K-3 will interact on the principle of a hydraulic press.
The hydrostatic pressure force S 2 created by the piston group in the chamber K-2 having an area of W 2 will be transmitted to the liquid in the chamber K-3 and act on the piston with an area of W 3 by force:
Figure 00000003
The hydrostatic pressure P 3 in the chamber K-3 created by the multiplier is equal to:
Figure 00000004
Substitute the value of S 3 in the formula, we obtain:
Figure 00000005
Thus, the hydrostatic pressure in the K-3 chamber is equal to the hydrostatic pressure in the K-2 chamber (hydraulic press).
The introduction of a multiplier power drive of the oilfield installation allows to increase the efficiency, which in existing installations is 0.4 ÷ 0.55, allows the reuse of compressed air.
The introduction of a tackle system multiplier drive into the power unit will increase the stroke length of the rod suspension points, reduce the load on the power cylinder, eliminate tubing from the underground equipment of the well, and reduce energy consumption. The power drive with the use of multipliers is a three-dimensional system that works on the principle of communicating vessels, which will allow them to be used as a balancing load and re-energy carrier.
For deviated wells, it is possible to use a combined rod-rope connection of the pump piston with the wellhead instead of rod couplings, protective cuffs and other devices.
In a two-chamber piston pump, the working cylinder is located below the bottom of the product reservoir, which allows maximum extraction of oil and revitalize mothballed oil wells.

Claims (2)

1. Multiplier power drive of an oilfield installation, containing a driving piston hydraulic cylinder connected to a working multiplier in a single design, characterized in that it contains an accumulating multiplier connected to the driving hydraulic cylinder with the formation of a three-dimensional closed structure, operating on the principle of communicating vessels, while the accumulating multiplier serves as a balancing load and at the same time serves as a reservoir of compressed air and liquid for their repeated use Drive operation.
2. The drive according to claim 1, characterized in that the increased hydrostatic pressure created by the working multiplier is transmitted through the liquid to the piston of the drive hydraulic cylinder, which, by means of a hydrostatic pressure, using flexible coupling, drives the piston of the sucker rod pump.
RU2006124363/06A 2006-07-06 2006-07-06 Multiplier-type power driving unit for oil field plant RU2333387C2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2741187C1 (en) * 2020-10-29 2021-01-22 Акционерное Общество "Научно-Производственное Предприятие "Пружинный Центр" Drive of sucker rod pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2741187C1 (en) * 2020-10-29 2021-01-22 Акционерное Общество "Научно-Производственное Предприятие "Пружинный Центр" Drive of sucker rod pump

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Effective date: 20130707