BR112020000137B1 - METHOD, SYSTEM AND USE OF CONTROLLING THE WORKING RANGE OF A PUMP BELLOWS - Google Patents

Abstract

Method and associated system, program and use of a computer, for controlling the working range of a pump bellows, including maximum limitations such as maximum retraction position and maximum extension position of the bellows, the method comprising the steps of: a) reading of at least one first position of a bellows (6', 6'') in a closed hydraulic circuit volume using at least one position sensor (12', 12''), g) transmitting a first position signal representing the first position for a control system, h) wherein the control system, based on at least the first position signal: c1) determines the position of the bellows (6', 6'') represented by at least the first signal position, c2) compares the bellows position (6', 6'') with a pre-determined operating range of the bellows position, and c3) if the position is outside the pre-determined operating range of the bellows position , instructs an oil management system valve (16', 16'') allowing a double-acting pressure-boosting liquid partition device (2) to recalibrate the volume of hydraulic fluid in the volume of the closed hydraulic circuit to reestablish a volume of hydraulic fluid that makes it to at least the first position (...).

Description

[001] The invention relates to a method for controlling the working range of a pump bellows and the associated system and use, including maximum limitations such as the maximum retraction position and the maximum extension position of the bellows. The invention is particularly suitable for use in systems that pump large volumes of particulate fluids (slurry/slurry) at high pressures, such as pressures above 500 bar and up to 1500 bar or even more.

[002] The invention may form part of a larger pumping system comprising one or more pressure transfer devices, a double-acting double-acting pressure-boosting liquid partition device, and a flow regulating assembly (such as a manifold valve).

[003] The invention is suitable for use at high pressures, ranging above 500 bar, and is especially suitable for hydraulic fracturing of oil/gas wells, where it is difficult to pump fluids with particles such as proppants forming part of the fluid. However, the pumping system can also be used in other well applications, such as in drilling operations to pump drilling fluids and in cementing operations, plugging and abandonment operations, completion or stimulation operations, acidification or nitrogen circulation. .

Background of the invention

[004] Hydraulic fracturing (also fracturing, casing or hydrofracturing) is a well stimulation technique in which rock is fractured by a pressurized fluid, in the form of gel, foam, sand or water. Chemicals can be added to water to increase fluid flow or improve specific properties of the water, such treated water is called 'slick water'. The process involves high-pressure injection of 'fracking fluid' (liquid-trapping sand or other proppants and chemicals) into a wellbore to create cracks in deep rock formations through which natural gas, oil and the brine will flow more freely. Typically, mechanical piston pumps are used to pump fracturing fluid under high pressures. These mechanical pumps have a very limited operating time due to mechanical wear on the pump's sliding surfaces caused by sand and particles in the pumped medium. Pumps that operate with liquids containing particles and/or demanding chemical fluids under high pressure have sealing surfaces that particles and/or abrasive chemical fluids (compounds) damage during operation. When seals are damaged, leaks and other problems can result, resulting in the pump reducing its effectiveness. Furthermore, mechanical pumps operate at high speeds, which creates rapid pressure fluctuations throughout the unit (high number of cycles), which over time leads to fatigue breakdowns. Consequently, the operational life cycle of these pumps is very limited and depends on the particle type, particle quantity, chemical composition and chemical concentration, as well as the working pressure. In rotary pumps, rotary seals (shaft) and expensive pump elements such as impellers and turbine wheels are quickly used up. In piston pumps, the piston is used against the cylinder, resulting in leaks, low efficiency and breakdown. Another well-known problem with plunger pumps is fatigue cracking of the fluid ends. The main cause of this is combined stresses from pressure fluctuations and linear mechanical stresses from the pistons. They are also limited by a maximum allowable rod load at the power end, making it necessary to match the plunger size to the desired flow/pressure.

[005] In general, plunger/piston pump units are used.

[006] When multiple pumps are connected to the same flow line to the well and are online simultaneously, there is a risk of forming interference patterns that correspond to the reference frequency of the flow line to the well. This leads to moving flow lines, which can cause damage to equipment and personnel (called "snaking" because the flow line moves like a snake).

[007] In fracturing operations, when the pumps are turned off and hydraulic pressure is no longer applied to the well, small grains of hydraulic fracturing proppants keep the fractures open. Proppants are typically made from a solid material, such as sand. Sand can be treated with sand or synthetics or natural materials such as ceramics. In land fracking, typically a so-called fracking fleet comprising several trucks is transported and positioned at the site. Each truck is supplied with a pumping unit to pump fracturing fluid into the well. Therefore, there are weight and physical limitations on the equipment to be used, limited by the total weight capabilities on the truck on the road and the physical limitations given by the trucks.

[008] Prior art, not suitable for fracturing but revealing a system in which clean hydraulic fluid is separated from the liquid to be pumped, includes EP 2913525 relating to a hydraulically driven diaphragm pumping machine ("pump"), in particular for water and difficult pump materials. The system comprises at least two side-by-side pumping units. Each pumping unit comprises a pump cylinder and a hydraulic cylinder. The pump cylinder (reference signs related to EP 2913525, 1.2) has a first lower end with a first inlet and outlet for the liquid to be pumped and a second upper end with a second inlet and outlet for hydraulic fluid. The pump cylinder (1,2) contains a bellows (3,4) closed at the lower end and open at the upper end for communication with the hydraulic fluid. The external part of the bellows (3,4) defines a space for the liquid to be pumped. The bellows (3,4) of the pump cylinder (1,2) is arranged to be driven by the hydraulic fluid supplied at its upper end, in a shell shape, as expansion and contraction to pump the liquid to be pumped adjacent to the first end bottom of the pump cylinder (1,2).

[009] The hydraulic cylinder (9,10) is placed side by side with the pump cylinder (1,2). The hydraulic cylinder (9,10) has a first lower end associated with a hydraulic drive and a second upper end containing hydraulic fluid that communicates with the second upper end of the pump cylinder (1,2). The hydraulic drive ends at its upper end with a drive piston (19,20) slidably mounted on the hydraulic cylinder (9,10). The hydraulic drives of the hydraulic cylinders (9,10) of the two pumping units are connected by a hydromechanical connection (25,27) designed to advance and retract the pistons (19,20) of each hydraulic cylinder (9,10)

[010] However, the solution in EP 2913525 is not applicable to hydraulic fractures at high pressures (i.e. more than 500 bar) due to the cylindrical pump chamber. The cylinder shape of the pump chamber will not be able to withstand the high pressures experienced in combination with a high number of cycles when used in hydraulic fracturing. Additionally, the bellows are made of polymer, resulting in the risk of particles being squeezed between the cylindrical wall and the bellows, potentially damaging the bellows. Additionally, there is a hydraulic cylinder connected to each pump cylinder. The hydraulic cylinder is not configured to increase the pressures entering the lower side of the piston (19, 20) because the effective area is smaller on the lower side of the piston (19, 20) than on the upper side of the piston (19, 20). . Furthermore, polymer bellows lack control over the direction of expansion, leading to the possibility of the bellows coming into contact with the cylinder wall. This can cause tears and proppants being forced into the base material.

[011] Hydromechanical connections in general have some disadvantages, including: - cannot synchronize with multiple units, - cannot vary ramp up/down depending on pressure and flow (cannot offer precise control of pump characteristics ), - cannot partial stroke, - cannot compensate for pressure/flow fluctuations in the flow, - would never be able to overlap and make a laminar flow, - generates a pressure drop over the control valve, which leads to heating of the oil and efficiency loss in the range of 5 to 10%.

[012] There is a problem with conventional pumps used for fracturing, that parts of the system can break after a few hours and need to be repaired. Thus, to provide redundancy in the system, fleets comprising a plurality of standby pumps are normal. This generates costs in both maintenance and labor hours, as a technician can only operate a few trucks.

[013] All hydraulic systems have a degree of internal hydraulic fluid leakage, this will also occur in the closed loop hydraulic system over several cycles. This leakage will build up over several cycles, adding to or retracting from the closed volume, causing the bellows to contract or overextend. Not having control over this will lead to premature failure of the bellows.

[014] Thus, an objective of the present invention is to solve at least some disadvantages with respect to prior art and more specific solutions to keep moving parts (pistons, seals) away from the particulate fluid (i.e. pumped medium) and avoid particles damage moving parts.

[015] More specifically, it is an object of the present invention to provide smooth and shock-free pumping of large flows at high pressures, reducing wear on all components in the flow circuit and, at the same time, providing a unit capable of integrating and Perfectly adapts to any pressure flow rate demand without the need for mechanical reconstruction or alterations. Furthermore, the ability of the present invention to synchronize with multiple units minimizes the risk of possible serpent.

[016] More specifically, one of the objectives of the invention is to provide a fracturing system that can operate at high pressures with high volume flow.

[017] Another objective is to provide a system in which the liquid to be pumped is separated from as many moving parts as possible.

[018] More specifically, one objective is to minimize the risk of damaging the bellows.

[019] Another objective is to provide a pumping system that has reduced weight, e.g. the pumping system must be able to be arranged and transported in common trucks or trailers that are part of the so-called frack-frets used in hydraulic fracturing.

[020] Another objective is to provide a system that does not require an external guidance system for the bellows.

[021] Another objective is to provide fully continuous controlled speed/stroke control to avoid pressure peaks, flow peaks and fluctuations.

[022] Another objective is to create a pump system for all pressure and flow configurations, typically used in fracturing or high pressure pumping industries, without the need for mechanical reconstruction.

[023] Another objective of the invention is to provide an advanced control and synchronization system of multiple units, to eliminate problems with conventional systems.

[024] Another objective is to provide a solution that can be used in new installations and be connected to existing installations, such as modernizing existing systems.

Summary of the invention

[025] The objectives are solved by the invention, as established in the independent claims, in which detailed embodiments of the invention are defined in the dependent claims.

[026] The present invention provides a solution to the objectives, ensuring that the amount of fluid in the volume of the closed hydraulic circuit is always within predefined ranges, that is, that there is not too much hydraulic fluid with the risk of unwanted extension of the bellows nor too little fluid with the risk of too much compression of the bellows. The invention may thus be a method for controlling the working range of a pump bellows in a fracturing system and a fracturing system.

[027] Thus, input into the control system is important to increase the life cycle of components in the system and, in particular, mobile components. For example, if there is a leak of hydraulic fluid from the closed loop system, there is a risk that the bellows will be damaged if it contracts/compresses too much.

[028] The invention that controls movement by constantly monitoring the position signal(s) of the dual-action pressure booster liquid partition device and/or bellows. If necessary to adjust, the protocol of the oil management system (a part of the overall control system) with valve is used to correct the positions or change the oil. For example, if the system comprises a dual-acting pressure-increasing liquid partition device and a pressure cavity for pressurizing a first fluid (e.g., fracturing fluid) with a second fluid (e.g., hydraulic pump fluid) Using a bellows to separate the first and second fluids, the bellows should never be fully compressed nor stretched or extended to the maximum. If the bellows is repeatedly extended and compressed to its maximum limits, wear, i.e. fatigue, will increase significantly, resulting in a shorter life cycle.

[029] The invention relates to a method for controlling the working range of a pump bellows, including maximum limitations such as the maximum retraction position and the maximum extension position of the bellows, the method comprising the steps of: a ) reading at least one first position of a bellows in a closed hydraulic circuit volume using at least one position sensor, b) transmitting a first position signal representing the first position to a control system, c) wherein the control system control, based on at least the first position signal: d) ) determines the position of the bellows represented by the at least the first position signal, e) ) compares the position of the bellows with a predetermined operating range of the bellows position, and f) ) if the position is outside the predetermined operating range of the bellows position, instructs an oil management system valve allowing a double acting pressure increasing liquid partition device to recalibrate the volume of hydraulic fluid into the volume of the closed hydraulic circuit to restore a volume of hydraulic fluid that causes the at least first position to return to a position within the predetermined operating range of the bellows position.

[030] The predetermined operating range of the bellows position may be a predefined range for the bellows position, which bellows position is read or monitored continuously by the control system, and the control system continuously monitors the first position of the bellows and comparing with the predetermined position in operating range.

[031] The predetermined operating range of the bellows position can be defined by specific physical end positions for the bellows, both for compression and extension of the bellows. Alternatively, instead of physical end positions, end positions may be software-operated positions indicating end positions. A signal can be transferred to the control system indicating that the bellows has reached the end position(s). The physical or software-operated positions that provide the end positions may be integral parts of the bellows, for example as part of a guidance system or a bellows position sensor or separate from the bellows. The control system can then decide whether the bellows has reached its final position. If the bellows does not reach the end position, the control system may decide that an (expected) signal is not read and instruct the oil management system valve to drain or replenish the hydraulic fluid in the closed volume of the hydraulic circuit.

[032] It is clear that all hydraulic systems have a degree of internal leakage of hydraulic fluid, however, throughout the description and states that the term closed-loop hydraulic system has been used for a "closed" system to distinguish from systems that are not defined by a hydraulic system. defined volume.

[033] The predetermined operating range of the bellows position may vary depending on the size and/or quantity of particles in the pumped fluid (e.g., fracturing fluid).

[034] The predetermined ranges will depend on the operating pressure, that is, compressibility of the hydraulic fluid.

[035] In one aspect, the method may be a method for controlling the working range of a pump bellows in a fracturing system.

[036] In one aspect, the first position signal of the at least one position sensor represents the position of bellows movably arranged within a pressure cavity.

[037] In one aspect, a second signal from at least one position sensor represents the position of a plunger in a double-acting pressure-increasing liquid partition device.

[038] If the system is provided with at least two position sensors and possibly additional sensors, redundancy will be achieved. If using more than one sensor, redundancy for the control system is ensured if one of the sensors malfunctions.

[039] In one aspect, the control system compares the at least the first position signal and the second signal and determines a position difference between the bellows and the plunger and, - compares the position difference with a range of difference of predetermined position and, - if the position difference is outside the predetermined position difference range, instructs an oil management system valve allowing a double acting pressure increasing liquid partition device to recalibrate the volume of hydraulic fluid in the volume of the closed hydraulic circuit to restore a volume of hydraulic fluid that causes the position difference to return to the predetermined position difference range.

[040] The predetermined position difference range depends on and varies with different pressures. This is due to the compressibility of the liquid/hydraulic liquid at different pressures. Furthermore, in this aspect, two different predetermined ranges are executed simultaneously in the control system, that is, the predetermined position difference range and the predetermined bellows position operating range, and the control system determines whether the first position and position difference are within the given ranges.

[041] If the position below is reaching the predetermined maximum deviation compared to the plunger position, the control system may send a signal to the oil management system valve to close a second valve port and open a third port from the valve to an oil reservoir. The double-acting pressure-increasing liquid partition device will adjust the piston according to the last bellows position after the oil management system valve is closed (i.e., second valve port). After adjustment, the oil management system valve will open the first valve port and the second valve port and continue its work cycle.

[042] In one aspect, wherein, if the position is below the predetermined operating range of the bellows position or the position difference range, the control system instructs the oil management system valve allowing the oil management system to double-acting pressure-boosting liquid partition recalibrates to fill hydraulic fluid into the closed interior volume of the hydraulic circuit and if the calculated volume of hydraulic fluid is greater than the predetermined operating range of the bellows position, the control system instructs to oil management system valve, allowing the double-acting pressure-boosting liquid partition device to recalibrate to drain hydraulic fluid from the closed hydraulic circuit volume.

[043] In one aspect, the at least the first position represents a volume in the volume of the closed hydraulic circuit and in which the control system, before step c1), calculates a volume of hydraulic fluid in the volume of the closed hydraulic circuit to ensure the exact position of the bellows, before continuing with step c1).

[044] In one aspect, the method may further comprise: - ) before step c), reading a first temperature from one or more temperature sensors arranged at different locations in the volume of the closed hydraulic circuit, - ) transmitting a first signal of temperature representing the first temperature to the control system, - ) wherein the control system, based on the first temperature signal, - determines the temperature in the volume of the closed hydraulic circuit, - compares the temperature with a predetermined operating temperature range, and - based on whether the position, position difference or temperature is within, above or below the predetermined bellows position operating range, the predetermined position difference range or the predetermined temperature operating range, respectively, operates an oil management system valve that allows dual-acting liquid partition device that increases pressure to recalibrate: - idle, fill hydraulic fluid or drain hydraulic fluid from the closed hydraulic circuit system.

[045] In one aspect, the bellows may have a central axis and the bellows may extend and retract in a substantially longitudinal direction along the central axis, and wherein one of the position sensors is a bellows position sensor reading the axial extension of the bellows.

[046] In one aspect, the oil management system valve may be disposed between the double-acting pressure boosting liquid partition device and a pressure transfer device and comprises a valve arrangement, wherein the valve arrangement valve, based on input from the control system, is operated to: - open to fluid communication between the double acting pressure boosting liquid partition device and the internal volume of the bellows, - open to fluid communication between a reservoir of fluid and the closed hydraulic circuit volume for filling hydraulic fluid into the closed hydraulic circuit volume, - open for fluid communication between a fluid reservoir and the closed hydraulic circuit volume for draining hydraulic fluid from the hydraulic circuit volume closed.

[047] The invention further relates to a system comprising a control system that communicates with an oil management system, the system comprising: - a pressure transfer device, characterized by the fact that it comprises: - a housing of a pressure chamber, the pressure chamber housing comprises: - a pressure cavity and a bellows movably disposed within the pressure cavity - at least one position sensor configured to read the position of the bellows and transmit a first-rate signal position representing the first position to the control system, and wherein the control system, based on the at least the first position signal, is configured to: - determine the position of the bellows represented by the at least the first position signal , - compare the position of the bellows with a predetermined operating range of the bellows position, and - based on whether the position is outside the predetermined operating range of the bellows position, is configured to operate an oil management system valve , allowing a double-acting pressure-increasing liquid partition device to recalibrate the volume of hydraulic fluid in the volume of the closed hydraulic circuit to reestablish a volume of hydraulic fluid that causes the at least first position to return to a position within the range predetermined operation of the bellows position.

[048] In one aspect of the system, the first position signal from the at least one position sensor may represent the position of the bellows.

[049] In one aspect of the system, a second signal from at least one position sensor may represent the position of a plunger in a double-acting pressure boosting liquid partition device.

[050] In one aspect of the system, wherein the control system is configured to: - compare at least the first position signal and the second signal and determine a position difference between the bellows and the plunger and, - compare the difference of position with a predetermined range of position difference, and - if the position difference is outside the predetermined range of position difference, instruct an oil management system valve allowing the action pressure increase liquid partition device double recalibrate the hydraulic fluid volume in the closed hydraulic circuit volume to reestablish a hydraulic fluid volume that causes the position difference to return to the predetermined position difference range.

[051] In one aspect, the system may further comprise one or more temperature sensors configured to read the temperature in the closed-loop hydraulic system and transmit signals to the control system, and wherein the control system is configured to: - based on whether the position, position difference, or temperature is within, above, or below the bellows position predetermined operating range, predetermined position difference range, or predetermined temperature operating range, respectively, operate a oil management system valve that allows dual action liquid partition device that increases pressure to recalibrate: - idle, fill hydraulic fluid or drain hydraulic fluid from the closed hydraulic circuit system.

[052] The invention further relates to a computer program, comprising processing instructions that, when executed by a processing device, cause the processing device to function as established in accordance with the method described above.

[053] The invention further relates to the use of the system described above in one of the following operations: extraction or production of hydrocarbons, hydraulic fracturing operations, plugging and abandonment, drilling operations, well completion or stimulation, cementing, acidification or nitrogen circulation.

[054] The invention further relates to the use of the method or system described above for controlled acceleration and deceleration, respectively, of the pump bellows at the turning point of the piston in the double-acting pressure-increasing liquid partition device. This is advantageous in dampening the impact of the check valves and for reducing vibrations in the system, because the control system is capable of monitoring the position of the double-acting pressure-boosting liquid partition device using the position sensor of the pressure-boosting device. double-acting pressure-increasing liquid partition and when approaching the end position, the unit discharge speed is reduced to dampen/dampen the speed of the valve element before entering the valve seat.

[055] The working range, that is, the operating range defined by maximum limitations, such as maximum retraction or compression position and maximum barrier extension position, where an extension of 0% represents a fully retracted or retracted position ( i.e. first end position) and 100% refers to the maximum extension position (i.e. second end position) of the barrier, is advantageously within: preferably 10% and 90%, more preferably within 20% and 80% , even more preferably within 30% and 70%. These exemplified intervals guarantee a significant increase in the barrier's life cycle.

[056] The present invention provides significant improvements over known solutions. The pumping system and its associated components provide the possibility of pumping at pressures of up to 1500 bar and above with high volume flow. For example, the project provides for the possibility of pumping 1 m3 at 1000 bar pressure per minute or 2 m3 at 500 bar per minute and any ratio between rate and pressure. The invention provides flexibility with respect to desired pump rates and pressures, e.g. reduced flow rates at high pressures and high flow rates at reduced pressures, in all embodiments with a substantially laminar flow.

[057] A pumping system in which the method and system according to the present invention can be used, can comprise one or more of a pressure transfer device, a double-acting pressure boosting liquid partition device and a flow regulating assembly (such as a valve manifold). A hydraulic pump unit typically pressurizes the double-acting pressure-increasing liquid partition device, wherein the double-acting pressure-increasing liquid partition device pressurizes the pressure transfer device. The bellows in the pressure transfer device functions as a "piston" between the hydraulic pressure side, i.e. the double-acting pressure-increasing liquid partition device and the hydraulic pump unit on one side, and the medium to be pumped into a well on the other side. The bellows functions as an extension of the piston in the double acting pressure boosting liquid partition device. The bellows in the pressure transfer device separates clean hydraulic fluid (inside the bellows) from dirty fluid with particles (outside the bellows).

[058] In all aspects of the invention, the bellows must be understood as a watertight barrier that separates the internal volume of the bellows and the volume between the external part of the bellows and the interior of the pressure cavity. That is, the bellows has a fixed outer diameter but is axially flexible, providing an annular space (e.g. space size at least corresponding to the diameter of the particles in the fracturing fluid) between the inner surface of the pressure chamber housing and the bellows in all bellows positions and at all pressures.

[059] The bellows is preferably fixedly connected at the top of the pressure cavity, and the bellows is surrounded by the pressure cavity in all directions, that is, below, radially and possibly partially on the upper side of the parts that are not part of the connection port. hydraulic fluid that enters and leaves the internal volume of the bellows. The total volume of the pressure cavity is constant, while the internal volume of the bellows changes. As the bellows extends and retracts within the pressure cavity, the remaining available volume of the pressure cavity changes. A volume of hydraulic fluid enters the interior of the bellows and displaces the volume of fluid to be pumped from the pressure cavity.

[060] The pumping system may be a positive displacement pump where volume variations in the pressure transfer device are achieved using a fluid-tight bellows that is radially rigid and axially flexible. This configuration results in a bellows that moves substantially in the axial direction, while movements in the radial direction are prohibited or limited. When the bellows is in a first position, i.e., a compressed state, the volume remaining in the pressure cavity is greater, whereas when the bellows is in a second position, i.e., an extended state, the volume remaining in the pressure cavity is larger. pressure is lower. The ratio of the dimensions of the inner surface of the pressure cavity to the outer surface of the bellows is designed so as to form a space between the inner surface of the pressure cavity and the outer surface of the bellows at all positions of the bellows, thus preventing the particles become trapped between the inner surface of the pressure cavity and the bellows. Thus, the fracturing fluids surround the bellows and the crack is formed so that its minimum extent is greater than the largest particle size of the proppants. The radial rigidity of the bellows ensures that they do not come into contact with the inner surface of the pressure chamber housing. Hydraulic fluid entering the internal volume of the bellows through the connecting port pressurizes the barrier and, due to the rigid properties of the bellows and/or possible internal orientation, all movement of the bellows is in the axial direction. The liquid to be pumped, e.g. fracturing fluid, is pressurized by filling the internal volume of the bellows with hydraulic fluid, thus increasing the displaced volume of the bellows, which results in a reduction in the remaining volume in the pressure cavity outside the bellows and an increase in the pressure of the liquid to be pumped . The liquid to be pumped is exiting through the first port and further through a flow regulating assembly such as a manifold valve.

[061] The pressure transfer device does not have sliding surfaces in contact with the liquid to be pumped. Thus, the useful life of the parts is prolonged, because there are no vulnerable parts in sliding contact with any abrasive liquid to be pumped. The pressure transfer device is compensated so that the driving hydraulic pressure is equal to the pressure in the liquid to be pumped, i.e. the fracturing fluid, and as such the bellows does not need to withstand the differential pressure between the hydraulic system internal actuation pressure and pressure in the liquid to be pumped.

[062] The pressure transfer device may be operated by pressure fed from a double-acting pressure-increasing liquid partition device, double-acting pressure-increasing liquid partition device that is pressurized by a pump unit hydraulics. The double-acting pressure boosting liquid partition device may be a double-acting pressure boosting liquid partitioning device. A first and/or second plunger chamber in the double-acting pressure-boosting liquid partition device forms part of at least one hydraulic circuit volume closed with the internal volume of the bellows and is capable of feeding and withdrawing large quantities of hydraulic fluids under high pressures to the internal volume of the bellows.

[063] The bellows can be returned to the first position, that is, the compressed state, by the assistance of the supply pressure in the liquid to be pumped. The liquid to be pumped, i.e. the supply pressure of the pumping liquid from the supply pump to be pumped, provides pressure assisting in compressing the bellows to the first position. In this compression phase, the pressure in the liquid to be pumped is equal to the pressure of the hydraulic fluid in the internal volume of the bellows, and the retraction is a result of the double-acting pressure-increasing liquid partition device, creating a pressure differential in volume when retracting. When the double acting pressure boost liquid partition device retracts, there will be a differential volume that the volume of the fluid pumped, supplied and pressurized by the feed pump (mixer) (i.e. the feed pump is supplying fracturing fluid to the pressure cavity), will compensate to compress the bellows. In the state of extension, i.e. when the bellows begins to extend by pressurized fluid filling the internal volume, the pressure in the hydraulic fluid is equal to the pressure in the liquid to be pumped (i.e. the supply pressure in the intake manifold and/or in the liquid reservoir to be pumped). When the pressure in the pressure cavity exceeds the supply pressure, a first valve closes and when the pressure exceeds the pressure in the discharge manifold, a second valve opens and fluid flows into the well. This compression and extension of the bellows will occur sequentially in the pressure transfer device.

[064] The invention can be used in conjunction with a pump for pumping particulate fluid at pressures above 500 bar, the pressure transfer device comprising a pressure chamber housing and at least one connection port, with at least a connecting port is connectable to a double acting pressure increasing liquid partition device by fluid communication means, the pressure chamber compartment comprises: - a pressure cavity within the pressure chamber compartment and at least one first fluid inlet and/or outlet port for the pressure cavity, - a bellows which defines an internal volume within the pressure cavity and in which the internal volume is in fluid communication with the connecting port, in which the pressure cavity pressure has a central axis with an axial length defined by the distance between the connecting port and the first port and a variable cross-sectional area over at least a portion of the axial length, and wherein the bellows is configured to move in a direction substantially parallel to the central axis over a portion of the axial length of the pressure cavity. The bellows is preferably radially rigid and axially flexible and is arranged to extend and retract over at least a portion of the length of the pressure cavity.

[065] Thus, the pressure cavity has a different cross section, e.g. at least two different cross sections, in its longitudinal direction. Preferably, the transition areas between different cross sections are smooth or continuous (without sharp edges). Such smooth or continuous transition areas prevent sedimentation and allow for higher pressures without weak points in the pressure cavity. In other words, the forces applied to the pressure cavity are the result of internal pressure. The geometry is optimized to make these forces as uniform as possible.

[066] The connection port is thus adapted for suction of hydraulic fluid and/or expulsion of pressurized hydraulic fluid into and out of the pressure cavity.

[067] The first port is adapted for the inlet/outlet of liquid to be pumped and discharged out of the pressure cavity.

[068] According to one aspect, the bellows can be connected to an internal surface of the pressure cavity. Preferably, the bellows is connected at the top of the pressure cavity with means that provide a fluid-tight connection between the bellows and the inner surface of the pressure cavity. As such, fluids are prevented from flowing from an internal volume of the bellows and into the pressure cavity.

[069] The bellows has a shape adapted to the shape of the pressure cavity, so that the bellows, in all its operating positions, is prevented from coming into contact with an internal surface of the pressure chamber housing. This means that the bellows, in all its operating positions, has a maximum extension in the axial and radial direction less than the restrictions defined by the internal surface of the pressure chamber housing.

[070] In one aspect, the pressure cavity tapers toward the first port, thus creating a natural funnel where sediments/proppants/sand can exit along with the fluid. Accordingly, the first hole of the pressure chamber housing is preferably shaped to prevent the accumulation of sedimentation (proppants/sand etc.) by tilting the pressure cavity towards the first hole. The first orifice can thus preferably be arranged in a lower section of the pressure cavity so that sediment can exit through the first orifice by means of gravity.

[071] In one aspect, the pressure cavity may be elongated, egg-shaped, elliptical, circular, spherical, ball-shaped or oval, or have two parallel sides and at least one portion of cross-section smaller than the cross section in the parallel portion.

[072] In another aspect, the pressure cavity may be circular. In yet another aspect, the pressure cavity may be multi-bubbled (e.g., like the Michelin man).

[073] In one aspect, the bellows has a radial and axial extension smaller than an inner surface of the pressure chamber compartment (i.e., defining the radial and axial extension of the pressure cavity), forming a space between the outer circumference of the bellows and an inner circumference, i.e. the inner surface, of the pressure chamber housing in all operational positions of the bellows. Thus, at all pressures, fluid is surrounding at least two sides of the bellows during operation of the pressure transfer device.

[074] According to one aspect, the bellows may have a cylindrical shape, similar to an accordion or an accordion shape. The construction of the bellows cylinder provides minimum bellows loads as its entire surface is constantly in a hydraulically balanced state. The bellows may thus comprise an accordion-type side wall providing axial flexibility and a fluid-tight end cap connected to the side wall of the bellows. The accordion-type sidewall may thus comprise a plurality of circular folds or convolutions provided in a neighboring relationship. Neighboring folds or convolutions may, e.g. be welded together or connected together using other suitable fastening means such as glue, mechanical connections. Neighboring folds or convolutions may be formed so that particles in the fracturing fluid are prohibited from becoming trapped between neighboring folds or convolutions in the bellows during bellows retraction and extraction. This can be achieved through the operating range of the bellows, i.e. the predefined maximum extension and retraction of the bellows, such that the openings between neighboring folds or between the folds and the inner surface of the pressure cavity are always larger than the largest expected particle size. As such, the risk of trapped particles is minimized.

[075] The bellows is preferably made of a sufficiently rigid material: metal, composite, rigid plastic, ceramic or combinations thereof, etc., providing a fluid-tight bellows that is radially rigid and axially flexible. The bellows preferably moves substantially in the axial direction, while movements in the radial direction are prohibited or limited. The bellows material is chosen to withstand large variations in pressure and chemicals in the fluid being pumped, thus minimizing fatigue and the risk of damage. If the bellows is made of metal, it can be used at higher temperatures than bellows that are made of more temperature-sensitive materials (i.e., materials that cannot operate at higher temperatures).

[076] Of course, other parts that are part of the overall system can also be made from appropriate materials, depending on the demands of specific projects, such as metal (iron, steel, special steel or examples above). However, other materials can also be used, such as composites, rigid plastics, ceramics or, alternatively, combinations of metal, composites, rigid plastics and ceramics.

[077] In one aspect, the bellows may comprise a guide system coinciding with, or being parallel to, a central axis of the pressure cavity, and wherein the bellows expands and retracts axially in a longitudinal direction along the central axis.

[078] In one aspect, the guidance system may comprise a guide.

[079] The pressure transfer device may further comprise a monitoring position of the bellows position sensor and/or a temperature sensor that monitors the temperature of a drive fluid in the volume of the closed hydraulic circuit. Additionally, pressure sensors can be used.

[080] The bellows may comprise a guide system comprising a guide. The guide can be connected to a lower part of the bellows and can be configured to be guided into the pressure chamber housing. The guide in the pressure chamber housing may form part of the inlet and outlet of hydraulic fluid into and out of the internal volume of the bellows. The guide may coincide with or be parallel to a central axis of the pressure cavity and the bellows may expand and retract axially in a longitudinal direction along the central axis.

[081] The bellows position sensor may be a linear position sensor. The bellows position sensor may be disposed in the connection port and comprise axial passage openings for unrestricted fluid flow.

[082] In one aspect, when the bellows position sensor is a linear sensor, a reading device can be fixedly connected to the bellows position sensor and a magnet can be fixedly connected to the guide, and wherein The reading device may be an inductive sensor that can read the position of the magnet so that the bellows position sensor can inductively monitor a relative position of the magnet and thus the bellows.

[083] In one aspect, the inductive sensor may be an inductive rod adapted to read the position of a magnet and therefore the bellows.

[084] In one aspect, the inductive sensor may comprise an inductive rod adapted to read the position of a magnet connected to the guide, so that the bellows position sensor inductively monitors the relative position of the magnet and therefore the bellows.

[085] The pressure transfer device may further comprise an additional fluid-tight barrier within the bellows. This can be used to further reduce or minimize the risk of fluid leakage between the internal volume of the bellows and the pressure cavity comprising the liquid to be pumped. This additional fluid-tight barrier may be a bladder, a bellows, a non-permeable layer of material, and may be the same or different in shape from the bellows.

[086] In one aspect, the pressure transfer device may further comprise an external barrier between the bellows and an internal surface of the pressure chamber housing. This external barrier may be particle protective (filter) or fluid tight, and may be a flexible material, a bellows-like bellows in place, a filter, etc.

[087] The control system also allows for partial strokes when working with large proppants and/or at startup. This is crucial in situations where the unit has had an unplanned shutdown, where the pumped liquid is still a slurry, allowing proppants to fall out of suspension and sediment. The partial stroke is then applied to resuspend the proppants in a slurry (suspended).

[088] In one aspect, the system may comprise two pressure transfer devices and the dual-acting pressure increasing liquid partition device may be configured to sequentially pressurize and actuate the two pressure transfer devices such that one pressure transfer device is pressurized and discharged (fracturing fluid discharged) while the other is depressurized and charged (charged by new fracturing fluid) and vice versa. The depressurization and charging operation can be assisted by the feed pump.

[089] Two dual-acting pressure boosting liquid partition devices can be configured to be operated individually, so that they can pressurize two of the pressure transfer devices simultaneously, i.e. synchronously or asynchronously, i.e. overlapped.

[090] In another aspect, the system may comprise four pressure transfer devices and two dual-acting pressure-increasing liquid partition devices, each of the dual-acting pressure-increasing liquid partition devices being configured to pressurize and sequentially discharging two pressure transfer devices, such that two of the pressure transfer devices are pressurized and thus discharged, while the other two pressure transfer devices are depressurized and thus charged, and vice versa.

[091] It is further possible to provide a truck comprising the pressure transfer device as defined above and/or the system defined above used in hydraulic fracturing.

[092] The system may further comprise a bellows position sensor adapted to monitor an axial extension of the bellows and therefore an amount of fluid entering and leaving the internal volume of the bellows, as well as a partition device position sensor. dual-acting pressure booster fluid that monitors the position of the dual-acting pressure booster liquid partition device, wherein signals from the dual-acting bellows position sensor and the dual-acting liquid partition device position sensor Dual action monitoring are monitored by the control system and compared with predefined working ranges for bellows extension and position of the double acting pressure booster liquid partition device. This is done because it is advantageous to know and be able to control the position of the axial extension of the bellows (the bellows should never be fully compacted or stretched to the maximum). Thus, input to the control system is important. For example, if there is a leak of hydraulic fluid from the closed hydraulic circuit system, there is a risk of the bellows being damaged if they contract/compress too much (i.e. outside the preset operating range). Too much contraction can lead to planks or sand being trapped between neighboring folds or convolutions in the bellows and/or increased delta pressure, while too much extension can lead to, for example, increased fatigue of the bellows or potential collision with the bottom surface of the housing. of the pressure chamber, reducing the expected useful life of the bellows.

[093] The volume flowing into and out of the internal volume of the bellows is monitored using the bellows position sensor, providing a high accuracy and controlled acceleration/deceleration of the bellows at the turning point of the increase liquid partition device of double acting pressure, which again results in calm and soft valve seats, i.e. 'reduced' movement of the valves in the flow regulation system. The slow, controlled movement of the valves prevents or minimizes the risk of damaging the valve seats in the flow regulation system. Thus, to achieve this, the system is capable of monitoring the position of the double-acting pressure-increasing liquid partition device using the position sensor of the double-acting pressure-increasing liquid partition device, and upon approaching the position Finally, the unit's discharge speed is reduced to dampen/dampen the valve element's speed before it enters the valve seat.

[094] The dual-acting pressure-increasing liquid partition device that provides control of the volume to be discharged into and out of the bellows, and also functions as a pressure amplification or boosting device, is preferably a hydraulic cylinder/plunger double acting/double pump pressure booster where the hydraulic pump pressure entering the pump is pressing/pressing an area with a fixed proportion larger than the secondary area. The secondary area is the area that works with the fluid that enters and leaves the internal volume of the bellows. This configuration provides double, triple, or even quadruple (or more) working pressure in the secondary area. The hydraulic pump system that drives the double-acting pressure-increasing liquid partition device, having a pressure range of e.g. 350 bar, for example, can provide 700-1400 bar to the internal volume of the bellows and therefore the same pressure in the pressure cavity. In order to be able to obtain a pressure transfer device and a double-acting pressure boosting liquid partition device to operate and operate satisfactorily under the high pressures specified above, the system is preferably capable of controlling and positioning the bellows with high precision. The volume of the closed hydraulic circuit (e.g. oil volume) that operates the bellows is preferably configured to be adjusted in volume by the oil management system valve to ensure the bellows are operating within working ranges/region of predefined operation and hydraulic fluid in the closed hydraulic circuit volume must be continuously monitored for temperature and replaced with cooled (fresh) fluid when necessary, all possible during/under/during pumping, albeit at a reduced rate for the system general.

[095] The double-acting pressure-increasing liquid partition device is preferably double-acting, wherein a primary side, defined by a first piston area, of the operating double-acting liquid partition device operates with a difference of pressure of 350-400 bar and, on the secondary side, defined by a second area of the piston, may have a multiple pressure, for example 1050 bar or more, which will be similar to the pressure under which the pressure transfer device, or that is, the bellows and pressure cavity can operate.

[096] The pressure transfer device can be operated by the hydraulic pump unit, e.g. an above-center variable pump that controls the double-acting pressure-boosting liquid partition device. The hydraulic pump unit can have two flow directions and an adjustable displacement volume. The hydraulic pumping unit can be driven and. by any engine operable to operate these hydraulic pump units, such as diesel engines or other known engines/engines. However, it is clear that the described hydraulic pump unit can be interchanged with a variety of hydraulic pumps controlled by a proportional control valve to pressurize the liquid partition device and pressure cavity that increase double acting pressure.

[097] The pressure transfer device is preferably pressure compensated, meaning that the bellows is hydraulically operated, guiding a quantity of oil or other hydraulic liquid into and out of the internal volume of the bellows, moving the bellows between a first position, that is, compressed state and a second position, that is, extended state. In operation, there will be the same pressure on the hydraulic fluids in the internal volume of the bellows as there will be on the fracturing fluid (i.e., medium to be pumped) in the pressure cavity outside the bellows. The liquid or medium to be pumped, e.g. fracturing fluid, being disposed below the bellows and in the space formed between the external part of the bellows and the internal surface of the pressure chamber housing.

[098] The pressure transfer device nor the double-acting pressure increasing liquid partition device do not have sliding surfaces in contact with the liquid to be pumped. Thus, the useful life of the parts is prolonged, because there are no vulnerable parts in sliding contact with any abrasive liquid to be pumped.

[099] The system can be controlled by an electromechanical control system. Inputs to pump control may include one or more of the following: - pressure sensors in the low pressure (clean oil) hydraulic system and in the slurry/sludge supply line - position sensors in the liquid boost partition device double acting pressure sensor, including piston/plunger position and bellows - temperature sensors in the volume of closed hydraulic circuit and low pressure hydraulics - HMI (Human Machine Interface) inputs configuring the desired flow, power, volume, delivery characteristics - well data (pressure, flow, pulsation characteristics) - filter, oil level

[0100] The pressure transfer device (through the double-acting pressure-increasing liquid partition device) is controlled, supplying the hydraulic pump units, e.g. above center axial piston pumps, variable instructions based on inputs.

[0101] It is also possible to provide a trailer, container or a skid, comprising the system defined above, used in hydraulic fracturing, together with an engine and the necessary trim.

[0102] The invention further relates to a fleet comprising at least two trailers, each trailer comprising at least one system as described above.

[0103] In summary, the invention and control system that may be in connection with an electromechanical control system may have benefits compared to prior art solutions, including: - Variable pressure, power and flow; Because the conditions of a pumping task can vary, the system can adapt to specific conditions. For example. if the pressure increases, the system can automatically adjust the flow to the maximum allowable power. If there is a set pressure, the electromechanical control system can vary the flow to maintain that pressure. If there is a defined flow, the electromechanical control system can vary pressure and energy up to system limitations. It is also possible to combine control parameters. - Partial caressing; When a system is removed from the network without previously washing the sludge/mud, sedimentation will occur. To avoid clogging, the system is capable of "re-exciting" the pumped medium through pulsation. - Variable ramp; The ideal ramp function for the system changes as a function of pressure and flow. - Soft online/offline; system capable of gradually increasing flow in order to avoid pressure spikes as the pumping system goes online/offline. - Synchronization of multiple units; a co-frack-spread of multiple units pumping simultaneously. This leads to situations where pressure fluctuations in the system sometimes coincide with the harmonic oscillation frequency of the piping, causing damage and potentially dangerous situations (snaking described above). By synchronizing the units and thus controlling the output oscillation frequency, this problem is eliminated. This also allows individual units to increase or decrease delivery rates depending on system heat limitations without changing overall system performance. - Overlap of pressure transfer devices to achieve a constant laminar flow of the pumped medium (e.g. fracturing fluid) to the wellbore. For example, if each system comprises four pressure transfer devices coupled in pairs with two dual-acting pressure boosting liquid partition devices. This allows for an asynchronous drive system that can provide virtually pulsation-free flow (laminar flow). - Pulsation damping; In the case of performing a hybrid "frack propagation" with the combination of conventional pumping systems and the pressure transfer device and systems according to the present invention, it is possible to react against the pulsations generated from the conventional pumping systems by pulsing the pressure transfer device and systems according to the present invention in opposite phase. - No minimum fee; the hydraulic pump units, e.g. The above-center axial piston pump works as an IVT (infinite variable drive) and can therefore seamlessly vary delivery rates from zero to max. - The electromechanical control system offers the possibility of directly driving the double-acting liquid pressure boosting device from the hydraulic pump unit, for example the above-center axial piston pump. This leads to faster response time and less pressure drop in the overall system, increasing efficiency and decreasing heat generated in the system. - Full control over the extension and retraction of the bellows throughout the entire movement. This allows faults, internal leaks to be detected and prevents damage to the bellows, not being carried out outside the specified operational parameters.

[0104] Throughout the description and claims, different words have been used for the liquid to be pumped. The term should be understood as the liquid in the pressure cavity outside the bellows, e.g. hydraulic fracturing fluid, fracturing fluid, fracturing, hydrofracturing or hydrofracking, or mud, stimulation fluid, acid, cement etc.

[0105] Additionally, various terms have been used for the position of the double acting pressure boosting liquid partition device or the position of the rod or piston in the double acting pressure boosting liquid partition device. It shall be understood as the position of the rod or piston relative to the outer casing of the double-acting pressure boosting liquid partition device.

[0106] These and other features of the invention will be clear from the following description of a preferred form of embodiment, given as a non-restrictive example, with reference to the accompanying drawings in which;

Brief description of the drawings

[0107] Fig. 1 shows an example of a preferable operational configuration for the method and system according to the present invention;

[0108] Fig. 2 shows details of a double-acting pressure boosting liquid partition device that can be used in connection with at least one pressure transfer device;

Detailed description of a preferred embodiment

[0109] Fig. 1 shows an example of a preferable operational configuration for the method and system according to the present invention. Disclosed is a well stimulation pressure transfer device designed specifically for very high pressure (500 bar and above) at high rates (e.g., 1000 liters/min or more for the specific system disclosed in Figure 1), pumping fluids , such as sludge, containing high amounts of abrasive particles. Two identical configurations are disclosed in Figure 1, having a common double-acting pressure booster liquid partition device 2, wherein the elements of the installation on the left side are indicated with a single apostrophe (') and the elements in the same configuration are indicated. on the right side it is indicated with a double apostrophe ('').

[0110] Details of the double-acting pressure boosting liquid partition device 2 used in connection with the pressure transfer device 1', 1'' are shown in Figure 2. A pressure transfer device 1' is shown. , 1'' for pumping fluid at pressures above 500 bars, the pressure transfer device 1', 1'' comprising a pressure chamber housing and a connection port 3', 3'', the connection port 3' , 3'' being connectable to a double acting pressure increasing liquid partition device 2 via fluid communication means in the form of the first valve orifice 26', 26'' and the second valve orifice 27', 27' ' and possibly through an oil management system valve 16', 16''. The pressure chamber housing comprises a pressure cavity 4', 4'' and a first port 5', 5'' connecting the pressure cavity 4', 4'' to a well via a flow management system 13 The first port 5', 5'' acting as inlet and/or outlet for fluid or liquid to be pumped. Further disclosed is a bellows 6', 6'' disposed within the pressure cavity 4', 4'' and in which an internal volume 7', 7'' of the bellows 6', 6'' is in fluid communication with the door. connection cavity 3', 3'' and the internal volume 7', 7'' are prevented from communicating with the pressure cavity 4', 4''. The length of the pressure cavity L', L'', extending in a longitudinal direction between the connecting port 3', 3' and the first port 5', 5'', has a variable cross-sectional area. The bellows 6', 6'' are configured to move in a direction substantially in the longitudinal direction, which in the drawing is coinciding with the central axis C', C'' of the pressure cavity 1', 1''.

[0111] The pressure transfer device 1', 1'' comprises a bellows, exemplified as a hydraulically driven fluid-tight bellows 6', 6'' comprising an internal guide 9', 9'' and a position sensor. bellows 12', 12'' with an inductive rod 43', 43'' adapted to read a magnet 10', 10''. The magnet 10', 10'' can be fixedly connected to the guide 9', 9''. The guide 9', 9'' is itself guided in the pressure chamber housing, for example along the longitudinal extent of the connection port 3', 3''. In the disclosed example, the guide 9', 9'' is connected to the lower end of the bellows 6', 6'' at one end and is guided into the pressure chamber housing at the upper end thereof. The guide 9', 9'', and therefore the magnet 10', 10'', follows the movement of the bellows 6', 6''. The bellows position sensor 12', 12'', for example the measuring rod 43', 43'' may comprise means for detecting and determining the position of the magnet 10', 10'' (and therefore the guide 9 ', 9'' and bellows 6', 6''), for example by inductive detection of the magnet position. Although the description describes that the magnet 10', 10'' is connected to the guide 9', 9'' which moves relative to the fixed measuring rod 43', 43', it is possible to arrange the magnet 10', 10'' stationary and for example the inductive guide 9', 9' 'to monitor the position. Furthermore, it is possible to use sensors other than the linear position sensor described above, as long as they are capable of monitoring the exact position of the bellows 6', 6''.

[0112] The bellows 6', 6'' are placed in a pressure cavity 4', 4'' with a defined clearance to the inner surface of the pressure chamber housing. The drive fluid is directed into and out of an internal volume 7', 7'' of the bellows 6', 6'' through a connecting port 3', 3'' in the upper part of the pressure cavity 4' , 4'' (i.e. the top of the pressure chamber compartment). The bellows 6', 6'' are fixedly connected at the top of the pressure cavity 4', 4'' to the inner surface of the pressure chamber housing by means known to the skilled artisan. The connecting port 3', 3'' is in communication with a double acting pressure increasing liquid partition device 2 and possibly an oil management system valve 16', 16'.

[0113] The pressure transfer device 1', 1'' may further comprise an air vent (not shown) to vent air from the fluid to be pumped. Air ventilation may be any ventilation operable to extract or vent excess air from a closed system, such as any suitable valves (choke) or similar.

[0114] The pumped medium, e.g. fracturing fluid with particles, enters and leaves the pressure cavity 4', 4'' through a first port 5', 5'' at the bottom of the pressure cavity 4', 4'' (i.e., fracture chamber compartment). pressure). The first port 5', 5'' is in communication with a flow regulating device 13, such as a valve manifold. The flow regulating device 13 is explained in more detail below.

[0115] Driven by the double-acting pressure boosting liquid partition device 2, the pressure cavity 4', 4'', in combination with the bellows 6', 6'', pumps the fluid by retracting and expanding the bellows 6 ', 6'' between your predefined minimum and maximum limitation. Keeping the bellows within this predefined minimum and maximum limitation extends the life of the bellows. To ensure that the bellows 6', 6'' operates within its preset limitation, this movement is monitored by the bellows 12', 12'' position sensor. Dynamically moving the bellows outside of these predefined minimum and maximum limitations can drastically reduce the life of the bellows. Without this control, the bellows 6', 6'' over time, as a result of internal leakage, particularly in the double acting pressure booster liquid partition device 2, will be overloaded by overextension (eventually fall out with the cavity of pressure 4', 4'' or super compress (retracts), causing particles in the fluid to deform or puncture the bellows 6', 6'' or generate delta pressure). A 9', 9'' central guide system, exemplified as 9', 9'' guide, ensures that the 6', 6'' bellows retract and expand in a linear manner, ensuring that the 6', 6' bellows ' do not hit the side walls of the pressure cavity 4', 4'' and at the same time ensure accurate positioning readings of the bellows position sensor 12', 12''. Therefore, the 4', 4'' pressure cavity is specifically designed to withstand high pressures and cyclic loads while preventing sedimentation build-up. The defined distance between the external part of the bellows 6', 6'' and the internal dimension of the pressure chamber housing guarantees the internal pressure balance of the bellows pressure 6', 6'' and the average pressure of the pump in the pressure cavity. pressure 4', 4''.

[0116] This pressure cavity is designed to carry the cyclic loads to which this system will be subjected and to house the bellows and the bellows positioning system. The connecting port 3', 3'' has a cylindrical shape machined and honed through the base material of the pressure cavity 4', 4'' “body” and serves as part of the guide system below 9', 9'' a cylinder and piston configuration. The 4', 4'' pressure cavity is ideally shaped to avoid stress concentrations. The 9', 9'' internal bellows guide system guarantees linear movement of the 6', 6'' bellows without the need for an external guide.

[0117] The first port 5', 5'' from the bottom in the pressure cavity 4', 4'' is shaped to prevent sedimentation accumulation by tilting or tapering the pressure cavity 4', 4'' towards the first port 5', 5''. Consequently, the accumulation of sedimentation is prevented because the sediments or particles of the liquid to be pumped flow naturally, that is, with the help of gravity, leaving the pressure cavity 4', 4'' and exiting through the first port 5', 5'' . Without this inclined or conical shape, sedimentation buildup can lead to problems during pressure transfer device startup and or sediment can accumulate and eventually surround lower portions of the outside of the 6', 6'' bellows.

[0118] The double-acting pressure boosting liquid partition device 2 comprises a hollow cylinder housing 20 having a longitudinal extension, wherein the hollow cylinder housing 20 comprises a first and a second part having a first cross-sectional area and a third part with a second cross-sectional area a2 of different size from the first and second parts. The double-acting pressure-increasing liquid partition device comprises a rod movably disposed like a piston within the cylinder. The rod has a cross-sectional area corresponding to the first cross-sectional area a1 and defines a second piston area 31', 31'' and wherein the rod, when disposed within the hollow cylinder, defines a first piston chamber 17' and a second 17'' piston chamber in the first and second parts. The rod further comprises a protruding portion 30 having a cross-sectional area corresponding to the second cross-sectional area a2 and the protruding portion defining a first piston area 30', 30'' and a first outer chamber 44' and a second 44'' external chamber in the third part. A portion of the rod defining the first and second piston chambers 17', 17'', over at least a portion of their length, is formed with a first recess 40' in pressure communication with the first piston chamber 17'. and a second recess 40'' in pressure communication with the second piston chamber 17''.

[0119] The first piston chamber 17' comprises a first piston port 18' which is in communication with the internal volume 7' of the bellows 6', alternatively through the first valve of the oil management system 16'. Likewise, the second piston chamber 17'' comprises a second piston port 18'' which is in communication with the internal volume 7'' of the bellows 6'', alternatively through the second valve of the oil management system 16. ''. The volumes within the first and second plunger chambers 17', 17'' are varied with the rod 19 being extracted and retracted into/out of the respective first and second plunger chambers 17', 17''. The rod 19 may comprise a double-acting pressure-increasing liquid partition device position sensor 21. The first and second seals 22', 22'' may be disposed between the protruding portion 30 of the rod and the first gas chamber. plunger 17' and the second plunger chamber 17'', respectively. Said first and second seals 22', 22'' may be ventilated and cooled by a separate or common lubrication system 23', 23''.

[0120] Rod 19 is driven back and forth, allowing sequentially pressurized fluid, such as oil or other suitable hydraulic fluid, to flow into the first inlet/outlet port 24' and out of the second inlet/outlet port 24'. exit 24'' and then be reversed to go in the opposite direction. The first and second input output ports 24', 24'' are in communication with a hydraulic pump unit 11.

[0121] The first and second valves of the oil management system 16', 16'' are positioned between the bellows 6', 6'' and the double acting pressure boosting liquid partition device 2 and are exemplified as two three-way valves which may comprise a first and second actuators 25', 25'' operating the first and second three-way valves, respectively. The configurations of the first and second valves of the oil management system 16', 16'' and their connection to the different pressure transfer devices 1', 1'' are identical. Thus, in the following, the system on the left side, that is, the system in communication with the first piston port 18', will be described in more detail. The oil management system valve 16', in the drawings exemplified as a three-way valve, comprises three ports, including a first valve port 26' in communication with the first plunger port 18', a second valve port 27' and ' in communication with the connecting port 3' of the pressure transfer device and a third valve port 28' in communication with an oil reservoir 29'. Similarly, with reference to the pressure transfer device 1'' on the right side, the oil management system valve 16'' in communication with the second plunger orifice 18'', comprises three orifices including the first orifice. of valve 26'' in communication with second plunger port 18'', a second valve port 27'' in communication with connection port 3'' of pressure transfer device 1'' and a third valve port 28 '' in communication with an oil reservoir 29''.

[0122] The hydraulic pump unit 11 may comprise central axial piston pumps that are controlled by position data from the bellows position sensor 12', 12'' and the double-acting pressure-increasing liquid partition device sensor. position 21 on the double-acting pressure-increasing liquid partition device 2 and possibly according to input data from the Human Machine Interface (HMI) and/or the control system. The hydraulic pumping unit 11 can be driven and. by an M engine, like any standard engine used in specific technical fields.

[0123] The flow regulation assembly 13, e.g. a valve manifold, may be a common flow regulating assembly for the identical systems on the left and right sides of the Figure. With respect to the system on the left side, the flow regulation assembly 13 may comprise a pump port 36' in communication with the first port 5' of the pressure transfer device 1', a supply port 35' in communication with the liquid to be pumped through an inlet manifold 14 in the flow regulation assembly 13 and a discharge port 37' in communication with the discharge manifold 15 in the flow regulation assembly 13. To be able to switch and operate between the different inlets and outlets, the flow regulator the assembly may comprise the supply valve 38' which comprises a check valve that allows the supply of fluid from the pump when the pressure in the inlet manifold 14 is greater than the pressure in the pressure cavity 4' and less than the pressure at discharge valve 39'. The inlet manifold 14 is in communication with a feed pump and a mixer. The mixer mixes the liquid to be pumped and the supply pump pressurizes the inlet manifold 14 and distributes said mixed fluid to the pressure transfer devices 1', 1' (pressure cavities 4', 4''). The blender typically mixes the liquid to be pumped with particles such as sand and proppants. Such a feed pump and mixer are known to the person skilled in the art and will not be described in further detail here.

[0124] Likewise, for the system on the right side of the Figure, the flow regulating assembly 13 may comprise a pump port 36'' in communication with the first port 5'' of the pressure transfer device 1'' , a supply port 35'' in communication with the liquid to be pumped through an inlet manifold 14 and a discharge port 37'' in communication with the discharge manifold 15. Furthermore, in order to be able to switch and operate between the different inlets and outlets, the flow regulating assembly may comprise the supply valve 38'' comprising a check valve which allows the supply of fluid from the pump when the pressure in the inlet manifold 14 is greater than the pressure in the pressure cavity 4'' and the discharge valve 39'' allowing fluid to be discharged to the discharge manifold 15 when the pressure in the pressure cavity 4'' is greater than the pressure in the discharge manifold 15 to pump fluids at high pressures and flow rates , for example in a well.

[0125] The flow regulation assembly 13 distributes the pumped liquid between the inlet manifold 14, the pressure cavity 4', 4'' and the outlet manifold 15 using two check valves, one for inlet and one for outlet. and loading/unloading port positioned between them. The supply valve 38', 38'' positioned between the supply port 35', 35'' and the pump port 36', 36', allowing fluid to charge the pressure cavity 4', 4'' when bellows 6', 6'' is retracting, that is, the liquid to be pumped provides pressure from below, helping to retract/compress the bellows 6', 6''. The liquid assist pressure for the pressure transfer device in the inlet manifold 14 is typically in the range of 3 to 10 bars, refilling the pressure cavity 4', 4'' and preparing the next dose of high pressure medium at be pumped into the well. When the bellows 6', 6'' begin to extend (i.e., pressurized fluid is filling the internal volume 7', 7'' of the bellows 6', 6''), the supply valve 38', 3' ' closes when the pressure exceeds the supply pressure in the inlet manifold 14 and thus forces the discharge valve 39', 39'' to open and thus discharges the contents into the pressure cavity 4', 4'' through from the discharge port 37', 37'' and into the discharge manifold 15. This will occur sequentially in the configuration on the left side of the figure and the right side of the figure, respectively.

[0126] Hydraulic pump unit 11 utilizes central axial piston pumps configured in an industrially defined closed hydraulic circuit volume, also called swash plate pumps. Swashplate pumps have a set of rotating cylinders containing pistons. The pistons are connected to the swashplate via a ball joint and are pushed against the stationary swashplate, which is at an angle to the cylinder. The pistons suck in fluid for half a revolution and push fluid out for the other half. The greater the slope, the more the pump pistons move and the more fluid they transfer. These pumps have a variable displacement and can switch between the first 24' pressure inlet/outlet port and the second 24'' pressure inlet/outlet port, thereby directly controlling the pressure boosting liquid partition device(s). double action pressure 2.

[0127] The oil management system valve 16', 16'' is exemplified as a three-way valve. However, other configurations can be used, such as an arrangement of two or more valves. The oil management system valve is controlled by a control system that can determine whether the correct volume of hydraulic fluid circulates between the internal volume 7', 7'' of the bellows 6', 6'' and the first and second piston chambers 17', 17'', utilizing the position sensors in the bellows and the double-acting pressure-increasing liquid partition device. At the same time, it allows the system to replace the oil in this closed hydraulic circuit volume if the temperature in the oil reaches operational limits. This is done by isolating the second valve port 27', 27'' from the double acting pressure increasing liquid partition device and opening communication between the first valve port 26', 26'' and the third valve port 28 ', 28'', thereby allowing the piston 30 or rod 19 in the double-acting pressure-boosting liquid partition device 2 to position itself in accordance with the bellows position 6', 6''. The control system that controls the oil management system valve 16', 16'' monitors the position of the bellows 6', 6'' relative to the position of the plunger 19 and adds or withdraws oil from the system when the system reaches a maximum deviation limit. This is done, preferably automatically, by stopping the bellows 6', 6'' at a certain position and letting the plunger 19 reset to a "bellows position" accordingly. A position of the piston bellows 19 typically corresponds to a position in which the volumes of the first piston chamber 17' and the second piston chamber 17'' are the same, which in most situations will be a position in which the bellows 6 ', 6'' is in an intermediate position. Thus, the piston 19 is preferably positioned relative to the actual position of the bellows 6', 6'.

[0128] The double-acting pressure boosting liquid partition device 2 that increases pressure is, for example, controllable by a variable flow source of e.g. hydraulic pump unit 11 through the first inlet/outlet port 24' and second inlet/outlet port 24''. The protruding portion 30 comprising a first end (i.e., through the first piston area 30') in fluid communication with the first inlet/outlet port 24' and a second end (i.e., through the first piston area 30') ') in fluid communication with the second input / output port 24''. Rod 19 further defines a second piston area 31', 31'' smaller than the first piston area 30', 30''. The rod 19 separating the first and second plunger chambers 17', 17'' and is operated to vary volumes of the first and second plunger chambers 17', 17'' by extracting and retracting the rod 19 into/out of the first and second piston chambers 17', 17'' respectively. The rod 19 is partially hollow and comprises a first recess 40' and a second recess 40''. The first and second recesses 40', 40'' are separated from each other. Thus, fluid is allowed to flow between the first and second recesses 40', 40''. The first recess 40' is in fluid communication with the first piston chamber 17' and the second recess 40'' is in fluid communication with the second piston chamber 17'.

[0129] Function 2 of the double acting pressure increasing liquid partition device is to ensure that a fixed volume of hydraulic fluid, for example oil, is loading/unloading the bellows 6', 6''. At the same time, it works as a pressure amplifier (intensifier or intensifier). In the illustrated double-acting pressure-increasing liquid partition device 2, pressure is increased by having a larger first piston area 30', 30'' than the second piston area 31' in the first piston chamber 17' and second piston area 31'' in the second piston chamber 17'' respectively. There is a fixed relationship between the first piston

[0130] area 30', 30'' and the second piston area 31', 31'', depending on the difference in the first and second piston areas. Therefore, a fixed pressure in the first or second outer chamber 44', 44'' provides a fixed pressure amplified by the pressure difference of the first and second areas of the piston. However, the inlet pressure can be varied to obtain a different pressure, but the proportion is fixed. Pressure amplification is vital to allow pumping of fluids beyond the maximum normal pressure range of the industrial hydraulic pump units 11 that power the unit and are varied to meet the pressure needs of industry.

[0131] The double-acting pressure-increasing liquid partition device 2 may comprise the position sensor 21 of the double-acting pressure-increasing liquid partition device that continuously communicates with the general control system that can operate at oil management system valve 16', 16'' for refilling or draining hydraulic fluid from the volume of the closed hydraulic circuit based on input from the position sensor of the double-acting pressure booster liquid partition device 21 on the device of double action pressure booster liquid partition 2 and in bellows position sensor 12', 12''. In the figures, the position sensor 21 of the double-acting pressure-increasing liquid partition device is disposed between the rod 19 and the inner walls of the first or second piston chamber 17', 17'', so that the position sensor 21 position of the double-acting pressure-increasing liquid partition device 21 is capable of continuously monitoring the position of the rod 19 and transmitting signals to a control system comparing the position of the bellows 6', 6'' and the piston or rod 19 in the double action pressure booster liquid partition device. However, it is possible to arrange the position sensor 21 of the double-acting pressure boosting liquid partition device also in other locations, including outside the double-acting pressure boosting liquid partition device 2, provided that it can monitor the position of the rod 19. As such, any leakage or overfilling of hydraulic fluid in any of the first or second plunger chambers 17', 17'' can be detected and corrected (e.g., using the oil management system valve 16', 16' To reset the rod to the zero offset position according to the bellows position as described above).

[0132] Specifically, the first and second piston chambers 17', 17' will be subjected to extreme pressures. All transitions are modeled to avoid stress concentrations. The rod 19 in the double-acting pressure-increasing liquid partition device is preferably a hollow rod to offset the casing balloon (casing = the outer walls of the double-acting pressure-increasing liquid partition device 2) during a cycle depression. Preferably, the hollow rod balloon is marginally smaller than the shell balloon to prevent any extrusion space between the hollow rod and the shell from exceeding allowable limits. If this space is too large, it will leak over the first and second seals 22', 22'', resulting in unequal volumes of hydraulic fluids in the first and second piston chambers 17', 17''. The thickness of the housing and the walls of the hollow rod, i.e. the walls surrounding the first and second recesses 40', 40'' are chosen so that they deform similarly/equally in the radial direction, and the first and second seals 22', 22'' are also protected, ensuring a long service life of the first and second seals 22', 22''.

[0133] The control system has three main functions. The first main function of the control system is to control the output characteristics of the pressure transfer device 1', 1'': the pressure transfer device 1', 1'' is capable of providing flow based on various parameters, such as: flow, pressure, power or combinations of these. Furthermore, if two double-acting pressure boosting liquid partition devices 2 are used, the pressure transfer device 1', 1'' can provide pulsation free flow up to 50% of the maximum theoretical rate by overlapping the two pressure boosting dual action liquid partitioning devices 2 in a way that one is taking control (rising to double speed) when the other is reaching its rotational position. Thus, it achieved reduced flow rates at high pressures and high flow rates at reduced pressures, in all embodiments with a substantially laminar flow. This is achieved with excess capacity in the pump 11 hydraulic unit. As the rate increases, there will gradually be less room for overlap and thus an increasing amount of pulsations. The variable displacement hydraulic pump unit 11 in combination with pressure sensors and bellows position sensor 12', 12'' and double acting pressure increasing liquid partition device position sensor 21 is critical to the flexibility that the system offers. The control system, which can be computer-based, also allows for the possibility of several parallel pumping systems acting as one by tying them to a field bus. This can be done by arranging the pumping systems in parallel and use the control system to force or operate the individual pumping systems asynchronously. This minimizes the risk of snakes due to interference.

[0134] The second main function of the control system is to provide complete control of the movement of the bellows 6', 6'' through the cycles relative to the double acting pressure boosting liquid partition device 2. This is relevant in closing / seating of valves in flow regulation assembly 13 (e.g. supply port 35', 35'', pump port 36', 36'', discharge port 37', 37'', supply valve 38' , 38'', discharge valve 39', 39'') because there is a combination of factors, which need to work in synchronicity for this system to work with these extreme pressures and delivery rates. As for a spring, it is important that the 6', 6'' bellows operates within its design parameters, i.e., does not extend or compress too much to have a long service life.

[0135] The third main function of the control system is the oil management system valve 16', 16'' of the control system which actuates when the control system encounters a difference between the positions of the increase liquid partition device double action pressure sensor 2 and bellows 6', 6'' or that the temperature is outside the predefined limits. The double acting pressure boosting liquid partition device 2 has generally the same strengths and failures as a hydraulic cylinder, is robust and accurate, but has a degree of internal leakage over the first and second seals 22', 22'' time accumulates as a factor of addition or retraction in the volume of the closed hydraulic circuit between the first and second piston chambers 17', 17'' and the internal volume 7', 7'' of the bellows 6', 6''. To solve these problems, the bellows 6', 6'' and the double-acting pressure boosting liquid partition device 2 are equipped with position sensors 12', 12'', 21 that continuously monitor the position of these units to ensure that are synchronized according to the software-programmed philosophy. Over time, the internal leakage of the system will increase, and when the position deviation between the bellows 6', 6'' and the double-action pressure boosting liquid partition device 2 reaches the maximum allowable limit, the first and/or or the second valves of the oil management system 16', 16'' add or retract the volume necessary to resynchronize the system (and preferably adjust automatically relative to a known position of the bellows 6', 6''). In addition, there may be a problem in which the liquid in the volume of the closed hydraulic circuit between the pressure transfer device 1', 1'' and the double-acting pressure booster liquid partition device 2 generates frictional heat flowing to back and forth. Furthermore, the first and second seals 22', 22'' in the double-acting pressure boosting liquid partition device 2 will also produce heat that will be dissipated into the liquid (e.g., oil) in the volume of the closed hydraulic circuit. This problem can be solved using the same system as for compensating for internal leaks. The closed-loop hydraulic volume can be replaced by the 16'', 16'' oil management system valve. The control system that detects a leak in the hydraulic circuit system and therefore operates the first and/or second valve of the oil management system 16', 16'' to allow replacement of the closed hydraulic circuit volume, isolating the bellows 6', 6'' in a compacted, retracted position and allowing the double acting pressure boosting liquid partition device 2 to discharge its volume into the reservoir (external) and refill it with fresh oil from the cooling system. For the valves in the flow regulation system 13 (e.g. supply port 35', 35'', pump port 36', 36'', discharge port 37', 37'', supply valve 38', 38'', discharge valve 39', 39'') to have a long service life, it is desirable that the seating of valves or orifices 35', 35'', 36', 36'', 37', 37'' , 38', 38'' is smooth or soft, that is, the valve members are not crushed into their desired valve seats. To achieve this, the system monitors the position of the double-acting pressure-increasing liquid partition device 2 (i.e., the piston in the double-acting pressure-increasing liquid partition device) and, as it approaches the end position, The discharge speed of the hydraulic pump unit 11 is increased to cushion the valve before seating to prevent forging of the check valve seat.

[0136] In the foregoing description, various aspects of the method, apparatus and use of the invention have been described with reference to illustrative embodiments. For purposes of explanation, systems and configurations have been established to provide a complete understanding of the system and its operation. However, this description is not intended to be interpreted in a limiting sense. Various modifications and variations of the illustrative embodiments, as well as other embodiments of the system, which are apparent to those skilled in the art to which the disclosed subject matter belongs, are considered to be within the scope of the present invention. Table 1: Reference list

Claims (11)

1. Method for controlling the working range of a pump bellows, including maximum limitations, such as the maximum retraction position and the maximum extension position of the bellows, characterized by comprising the steps of: a) reading at least one first position of a bellows (6', 6'') in a closed hydraulic circuit volume using at least one position sensor (12', 12''), b) transmitting a first position signal representing the first position to a control, c) wherein the control system, based on at least the first position signal: c1) determines the position of the bellows (6', 6'') represented by at least the first position signal, c2 ) compares the position of the bellows (6', 6'') with a predetermined operating range of the bellows position, and c3) if the position is outside the predetermined operating range of the bellows position, instructs a management system valve of oil (16', 16'') allowing a double-acting pressure-increasing liquid partition device (2) to recalibrate the volume of hydraulic fluid in the closed hydraulic system loop volume to reestablish a volume of hydraulic fluid that makes that the at least first position returns to a position within the predetermined bellows position operating range and wherein, - if the position is below the predetermined bellows position operating range, the control system instructs the control system valve to oil management (16', 16'') allowing the double-acting pressure boost liquid partition device (2) to recalibrate to fill hydraulic fluid into the volume of the closed hydraulic circuit, and - if the position is above the predetermined bellows position operating range, the control system instructs the oil management system valve (16', 16'') allowing the double acting pressure boost liquid partition device (2) to recalibrate to Drain the hydraulic fluid from the volume of the closed hydraulic circuit. 2. Method according to claim 1, characterized in that the first position signal of at least one position sensor (12', 12'') represents the position of the bellows (6', 6'') movably arranged inside a pressure cavity (4', 4''). 3. Method according to claim 2, characterized in that a second signal from at least one position sensor (21) represents the position of a plunger (19) in a double-acting pressure boosting liquid partition device (2 ). 4. Method according to claim 3, characterized in that the control system compares the at least first position signal and the second signal and determines a position difference between the bellows (6', 6'') and the piston ( 19) and, - compare the position difference with a predetermined position difference range and, - if the position difference is outside the predetermined position difference range, instructs a valve of the oil management system (16', 16 '') allowing a double-acting pressure boost liquid partition device (2) to recalibrate the volume of hydraulic fluid in the closed hydraulic system loop volume to reestablish a volume of hydraulic fluid that causes the position difference to return to within the predetermined position difference range. 5. Method according to any one of the previous claims, characterized in that it further comprises: d) before step c), reading a first temperature from one or more temperature sensors (42', 42'') arranged in locations different in the volume of the closed hydraulic circuit, e) transmitting a first temperature signal representing the first temperature to the control system, f) wherein the control system, based on the first temperature signal, - determines the temperature in the volume of the circuit closed hydraulic, - compares the temperature with a predetermined operating temperature range, and - based on whether the position, position difference or temperature is within, above or below the predetermined operating range of the bellows position, the range of difference of predetermined position or predetermined temperature operating range, respectively, operates an oil management system valve (16', 16''), allowing the double-acting pressure boost liquid partition device (2) recalibrate by: - idle, fill hydraulic fluid, or drain hydraulic fluid from the closed hydraulic circuit system. 6. Method according to any one of the preceding claims, characterized in that the bellows (6', 6'') has a central axis (C', C'') and the bellows (6', 6'') extends and retracts in a substantially longitudinal direction along the central axis (C', C''), and wherein one of the position sensors is a bellows position sensor (12', 12'') reading the axial extension of the bellows (6 ', 6'') 7. Method according to any one of the preceding claims, characterized in that the oil management system valve (16', 16'') is disposed between the double-acting pressure increasing liquid partition device (2) and a pressure transfer device (1', 1'') and comprise a valve arrangement, wherein the valve arrangement, based on input from the control system, is operated to: - open for fluid communication between the device of double acting pressure increasing liquid partition (2) and the internal volume of the bellows (6', 6''), - open for fluid communication between a fluid reservoir (29', 29'') and the volume of the closed hydraulic circuit for filling hydraulic fluid into the closed hydraulic circuit volume, - open for fluid communication between a fluid reservoir (29', 29') and the closed hydraulic circuit volume for draining hydraulic fluid from the circuit volume closed hydraulic. 8. System comprising a control system communicating with an oil management system valve (16', 16''), the system comprising: - a pressure transfer device (1', 1'') comprising: - an oil management system valve (16', 16”); - a double-acting pressure-increasing liquid partition device (2); wherein the pressure transfer device (1', 1”) comprises: - a pressure chamber housing, the pressure chamber housing comprises: - a pressure cavity (4', 4'') and a bellows ( 6', 6'') movably arranged within the pressure cavity (4', 4''), - at least one position sensor (12', 12'') configured to read the position of the bellows (6' , 6'') in a closed hydraulic circuit volume and transmitting a first position signal representing the first position to the control system, characterized in that the control system, based on the at least the first position signal, is configured to: - determine the position of the bellows (6', 6'') represented by at least the first position sign, - compare the position of the bellows (6', 6'') with a predetermined operating range of the bellows position , and - based on whether the position is outside the predetermined operating range of the bellows position, is configured to operate an oil management system valve (16', 16''), allowing a liquid partition device of double acting pressure boost (2) recalibrates the volume of hydraulic fluid in the volume of the closed hydraulic circuit to reestablish a volume of hydraulic fluid that causes the at least first position to return to a position within the predetermined operating range of the position of the bellows, wherein if the position is below the predetermined bellows position operating range, the control system instructs the oil management system valve (16', 16”) allowing the pressure increase liquid partition device double-acting valve (2) recalibrates to fill hydraulic fluid into the closed hydraulic circuit volume, and if the position is above the predetermined bellows position operating range, the control system instructs the oil management system valve (16 ', 16”) allowing the double acting pressure increasing liquid partition device (2) to recalibrate to drain hydraulic fluid from the closed hydraulic circuit volume. 9. System, according to claim 8, characterized in that the first position signal of at least one position sensor (12', 12'') represents the position of the bellows (6', 6''). 10. System according to claim 9, characterized in that a second signal from at least one position sensor (21) represents the position of a plunger (19) in a double-acting pressure boosting liquid partition device (2 ). 11. System according to claim 10, characterized in that the control system is configured to: - compare at least the first position signal and the second signal and determine a position difference between the bellows (6', 6'' ) and the plunger (19) and, - compare the position difference with a predetermined position difference range, and - if the position difference is outside the predetermined position difference range, instruct a valve of the oil management system (16', 16'') allowing the double-acting pressure-boosting liquid partition device (2) to recalibrate the volume of hydraulic fluid in the closed hydraulic system loop volume to reestablish a volume of hydraulic fluid that causes the position difference returns within the predetermined position difference range.