Hydraulic unit of borehole hydraulic power plant

FIELD: electricity.

SUBSTANCE: hydraulic unit of borehole hydraulic power plant includes hydraulic turbine that is connected to electric generator, which are installed in borehole, electric cable that connects electric generator on the surface with electric converter. Hydraulic turbine is turbodrill, electric generator is electric drill, which are unitised and connected by means of common casing with slots. To bottom part of casing fixing unit is connected, which includes bottom-hole thrust block, fixing unit levers and thrust levers, the sliding elements of which are installed with the possibility of movement along bottom-hole thrust block cone, thus affecting fixing element levers, causing their divergence to borehole walls. Hydraulic unit is equipped with unloading device, for instance, jack that is connected with top end of boring column.

EFFECT: operable device for power generation by borehole hydraulic power plant and avoidance of expenses for development of borehole hydraulic unit.

2 dwg

 

The invention relates to energy and can be used for electricity production and organisation of electricity supply in areas that have the necessary conditions to work well hydropower plants, including for the implementation of decentralized Autonomous power supply, remote from centralized utilities consumers. Thus, the claimed unit is intended for use in downhole hydroelectric power.

Known hydropower (Karelin VA and other Hydroelectric station. Edited by Prof. Karelin VA and Krivchenko GN. M, Energoatomizdat, 1987). It includes a water source such as a river, dam, nutrient capacity, is connected with the conduit, the lower end of which is connected to the area of the drain, located below the point of the message, the upper end of the conduit with the nourishing capacity. In the lower part of conduit installed machine hydraulic - turbine, the shaft of which is connected to the rotor of the generator, forming a combination of the unit. Hydraulic energy of the water stream is converted by the hydraulic unit into electrical energy, which is supplied to the electricity consumer. Known hydropower plant, because it is on the surface, is not constrained in size, i.e. in its design n the t a severe limitation in dimensions, incl. hydraulic unit. Moreover, in the construction, for example in bearings provided labyrinth seal (overall), and the generator is located in a separate room under normal, as a rule, the conditions.

Known downhole hydroelectric power plant (Generation of electricity during the injection of a denste fluid into a subterranean formation. Patent US 4132269 And CL. EV 43/20, F03G 7/04, publ. 02.01.1979,) using the similar principle, the conduit in which is the borehole and the hydraulic unit can be located at a great depth, and adopted as a prototype. In the wells hydroelectric power to its unit imposed more stringent requirements on the conditions of its operation. In particular, these requirements include: the need to work, including electric, water (liquid); work with small dimensions - diameter 164-290 mm; operation at high hydrostatic pressures up to 30-40 MPa or more; and when exposed to abrasive inclusions, commonly found in underground water used as source water for the operation of the downhole unit hydroelectric station, then SHES.

The required specifics of its operation is under her fitness during installation and operation to the operations of the technological process of drilling, including, when mounting gedroogde the ATA should be carried out only through the wellhead - without special auxiliary mines for this purpose, using equipment and tools used in drilling.

Currently, the serial production of hydraulic units for borehole hydropower that meets the special (specific) requirements to them, and adapted to the drilling process, is missing. And associated with the implementation of the downhole unit expenditure on research and development (R & d), development (R & d) and the organization of production on their serial production will complicate the implementation phase of the device and increase its value.

The technical result, which is aimed by the invention is a device - borehole hydraulic unit, which would provide the required hard downhole conditions of his work, namely its small size (diameter), the operation of the generator in the water (liquid) at high pressure, including those containing abrasive particles, transfer produced by a unit of electrical energy from hydroelectric (often from the bottom) on the surface at a special fixed in the drill string of pipe downhole cable, perform, including the role of the carrying line, with a minimum of implementation costs working at the trojstva, and adapted to the drilling, installation and operation of which would be carried out only through the wellhead and with the use of tools and equipment used for drilling.

This technical result is achieved by the fact that in the known unit borehole hydropower plants, including a turbine connected to a generator installed in the borehole, the cable connecting the generator on the surface with electroprecipitation, the turbine is a mud motor, a generator - electric drill, which is coupled to and connected through a common housing with the slots to the bottom of the housing is connected to the node record, including a focus downhole, the latch levers and the thrust levers, sliding elements are mounted for movement on the cone stops downhole, acting on the levers of the latch, causing their rejection to the walls of the well, the hydraulic unit is equipped with a discharge device, for example, a Jack connected to the upper end of the drill string.

The features of the proposed borehole hydroelectric help you to achieve before the invention of the result, namely, is coupled to and fixed on the string of drill pipes for electrophorese the mud motor and the drill connected to the cable, for replyname to pipes, with the existence of well hydropower flow (CGAP) working in downhole conditions. By its operation, under the action of SHEP through the mud motor, its rotor rotation takes and converts the hydraulic energy of SHEP into mechanical energy turbodrill (Gresov I.S. and other Turbine drilling deep wells. M., Nedra, 1967). Occur when the mud motor reaction torque is perceived pillar drill pipe to electrophorese, which is connected to the body of the mud motor and the upper end of which is rigidly secured to the wellhead, for example in a rotary table (Gresov I.S. and other Turbine drilling deep wells. M., Nedra, 1967), or using the Jack. Torque turbodrill is transmitted is connected to its rotor anchor above a predetermined electric drill, the reactive torque which (as his body connected with the column pipe) also perceived the drillstring pipe, the upper end of which is secured to the wellhead (Fomenko FN. Electric drills for drilling oil and gas wells. M, 1958). The drill mode of the generator, produces electricity and cable attached to the string of pipe to electrophorese transmits it to the surface to electropneumatically-shaper, and then she goes to the consumers.

Applied the s in the inventive device the turbodrill, the electric drill, and a cable fixed to the drill string, designed for use in downhole conditions, and this gives grounds to state that the efficiency of the downhole unit hydroelectric station in downhole conditions. In addition, since the applied equipment adapted to the technological process of drilling and operation of its installation and operation are combined with characteristic operations, and the proposed hydroelectric power plant is well adapted to the drilling process. In particular, the installation of the unit in the well and the subsequent operation is carried out only through the wellhead and do not require this additional auxiliary mines.

Supply unit borehole hydroelectric node record, including a focus downhole, the latch levers and the thrust levers, sliding elements are mounted for movement on the cone stops downhole, acting on the levers of the latch, causing their rejection to the walls of the well, allows to stabilize the condition of the unit, to reduce the possible negative is caused by the dynamics of the deviations occur, which may reduce its reliability (reliability). The explanation for this is as follows. Between building the m turbodrill and the borehole wall there is a gap, of 8 mm and more. When the rotor unit is suspended on a string of pipe turbodrill of the unit rotates, causing twisting at some angle the tubing, the upper end of which is secured to the mouth (under the action of a reactive moment). The effect on the string of pipe torque, including variables, at various electrical loads of the consumers, the gap between the housing unit and the borehole wall, lead to the emergence of dynamic operating conditions of the hydraulic unit (higher vibration, alternating torsional deformation) and negatively affect reliability and, as a consequence, the security of supply from him (as energy source). Site fixing unit allows you to "slow down" from possible torsional vibrations in the drill string unit - its lower part (the actual mud motor and the drill - hole walls, and when the possibility of its rotation (twisting) under the action of the "twisting" of efforts to ensure its downhole bearing and slide (cranking) and "to do" its position in the borehole more stable. This allows to reduce the level of vibrations and dynamic loads of the actual unit and increase its reliability.

Use as unloading device Jack, soedinennih the upper end of the drill string, designed to secure the downhole pipe string to electrophorese at the wellhead allows you to reduce the load of the weight of the drill string (it is greater, the greater the depth of the well is the length of the drill string), acting on the actual unit. At greater depths, despite the use of electric drills (turbodrills spindles to reduce the load on the electric drill, the weight of the pipe string may exceed the permissible value of the strength of the unit, disable it. When this Jack is holding a drill string, takes the load of the weight of the column, or part thereof, and the load on the hydraulic unit does not exceed a maximum level.

Figures 1 and 2 illustrate schematic operation of the proposed unit borehole hydroelectric, further SGAS. Figure 1 is a diagram of the unit SHES well before placing it on the bottom of a well (before fixation in the well). Figure 2 is a diagram of the fixing unit of the unit SGAS when you put it on the bottom (fixing it in the hole).

In figure 1, 2 introduced the following notation: 1 - borehole; 2 - aquifer interval, perebranny well; 3 - water from a surface source of water, held up well; 4 - zone flow (absorption), to which the well was drilled; 5 - water is in the well; 6 - dynamic water level in the well; 7 - valve surface water source; 8 - turbo-drill wells turbine); 8.1 - stator vanes turbodrill; 8.2 - blade rotor of the mud motor; 8.3 - fluid channel turbodrill (mechanical-hydraulic coupling of the blades of the stator and rotor); 9 - the drill (downhole motor - generator); 9.1 - anchor-spindle drill; 9.2 - hollow (hydraulic) channel in the anchor spindle; 10 - housing unit (turbine - generator); 10.1 - body electric drill; 10.2 - case turbodrill; 10.3 - second sub connecting 10.1 and 10.2; 11 - slot in the housing 10 of the sub 10.3; 12 - centering spring; 13 - emphasis downhole; 14 - thrust limiter stops downhole; 15 - levers resistant; 16 - levers of the latch; 17 - wall of a borehole; 18 - the first sub; 19 - drill pipe; 20 - electric cables; 21 - coupling connection wire; 22 - bracket pin connector 23 - pin connector cable; 24, 25 contacts cable; 26 - electroprecipitation; 27 - Jack connected with the top of the drill string at the wellhead.

To generate electricity using the drill string to electrophorese, equipped with a special cable, when connecting the tubes with the unit at the bottom of the drilled well hydropower purposes, the construction of which prividenya figure 1. The diameter of the drilled hole is 190 mm Hole drilled to the absorption zone 4 (well of peravurani the absorption zone below her soles on 2 meters). In the process of drilling its peleburan aquifer interval 2, which tested drillstring equipped with a filter for later use of water for the formation of hydropower flow in a borehole (hereinafter SGAP). Borehole flow measurements (Ivashev L.M. Fighting acquisitions drilling fluid during the drilling of exploration wells. - M., Nedra, 1982) perebeinos aquifer interval defined by the position of its boundaries and flow rate, which amounted Q=0.01 m3/s

For the formation of the desired power SHIP to her mouth water supply 3 connected to the well water from a surface source, for controlling the flow of which is provided by the valve 7. The extra expense of surface source to generate proposed borehole hydro electric power, equal to N=65 kW, is also Q=0.01 m3/c. Thus, the total flow of water generated by SHEP is QΣ=0,02 m3/s Streams of water from the water pipe 3 and from the water-bearing interval 2 arrives in the well and moving in the area of its flow - the absorption zone, forming CHAP. Well it is the dynamic level of pressure Hthe n its value determined for the wells amounted to 450 meters Downhole flow measurements checked and confirmed that water leaks in the interval from Hbottomsto the place of installation of the unit no. Hydraulic capacity determined according to a known ratio (Karelin VA and other Hydroelectric station. Edited by Prof. Karelin VA and Krivchenko GN. M, Energoatomizdat, 1987), formed SHEP, after the substitution of the relevant values are:

N=ρ·q·NDS·QΣwhere

N - hydraulic power generated in the well CHAP, W;

ρ - the density of water, kg/m3;

q is the acceleration of gravity, m/s2;

NDN - dynamic level pressure (exceeding the dynamic level in working well) above the unit, m;

QΣ- the total flow of SHEP in cross section at the depth of installation of the unit, m3/s

For this example: ρ=103kg/m3; q=9.8 m/s2; NDN=450 m; QΣ=0.02 m3/s After substituting in the formula (1) will receive:

Taking the achievable efficiency of the existing unit drilling equipment, equal to η=(0,75-0,85), we can say that using it for this example in the well can be produced SFOR is new in it SHEP, with hydraulic power equal 88,2 kW, electricity with a capacity of 65 kW.

For the implementation of electricity generation in the hole it goes down the drillstring, the composition is similar intended for electronorte (Fomenko FN. Electric drills for drilling oil and gas wells. M, 1958). Before that, the mud motor 8 and the drill 9 is coupled to, what their housing 10.3 and 10.1 connected sub 10.2 and installed outside their housing unit 10, in which, as in the sub 10.3, with holes 11 through which the fluid channel of the turbodrill 8 communicated with the hole (through them has a message with the bore and the cavity 9.2 armature-spindle 9.1 drill 9). The turbodrill 8 in the lower part of the housing 10 is attached to the site of fixation, including a focus downhole 13, the latch levers 16 are connected with the thrust levers 15, the sliding elements are mounted for movement on the cone lock hole 13, causing their rejection to the borehole walls (Rock cutting tools on the rotor of the mud motor is not installed - it is missing).

The sub 18 screwed on the bottom tube of the drill string, through the thread on the drill 9 is screwed on the assembled unit. Mounted on the pipe unit is lowered into the well on a string of drill pipe is Boo the situation technique using a winch for pulling-lifting the drill and pipe turning machine driver.

Thus, the mud motor 8 in the lower part is connected to the node record, and in the upper part - with electric drill 9 through the connection of their buildings housing 10 with the slots 11. In the proposed device is applied is used for drilling deep wells turbodrill type TSE-6 5/8"diameter 172 mm, a rotation speed of 685-1and with the number of steps in the section, sufficient to provide the desired power output of 77 kW at a flow rate of flow of water through it, equal to 20 l/s (Fomenko FN. Electric drills for drilling oil and gas wells. M, 1958). The electric drill type A-8, 9 designed for electrophorese deep wells, when rotation of its rotor can operate in the mode generator (Gresov I.S. and other Turbine drilling deep wells. M., Nedra, 1967; Fomenko FN. Electric drills for drilling oil and gas wells. M, 1958). It is adapted for use in downhole conditions - performed oil and this allows him to work in the downhole fluid, including water containing chemicals and abrasive particles, at high hydrostatic pressures. For this example the selected drill type A-8 with an outer diameter of 164 mm, the rotational speed of 685-1and develop capacity of 65 kW.

The mud motor 8 and the drill 9 is coupled to their body are connected. In the lower part of the building is the turbodrill 10.2 connected node of the fixing unit. Thanks to this site, occur during operation of the unit share of the reactive moment "twisting" of the lower end of the drill string is transferred to the walls of the borehole (perceived). In this case, the hydraulic unit (stator of a turbo-drill and drill the lower part of the pipe string with unit) stable, is stationary and does not vibrate during rotation of the rotors with a nominal frequency.

On the upper part of the drill 9 (hydraulic unit) is screwed on the tip 18, the internal thread connected with the lower drill pipe 19. To the downhole drill string includes a drill pipe (19), connected by a coupling connection 21. In each clutch installed brackets 22 pin connection 23 of the cable 20. When connecting couplings 21 drill pipe automatically connect the installed pin connection cable. This provides an isolated line, connected by means of a sealed connectors with an electric drill. At the exit of the drill pipe, the cable 20 is connected to electroprecipitation - driver signal 26. The cable can be two -, three-core or stranded (Fomenko F.M. Drilling the drill. M., Nedra, 1974)

The cable 19 is used specialized used in the implementation of electrophorese. It is adapted for RA is the notes in borehole conditions: includes load-carrying elements, contact connectors 23, mounted on the brackets 22, and can withstand the resulting forces (cargo) in the cable when its great length (for deep wells and large depth of installation of unit); works reliably in moving water, including those containing abrasive particles; it is fitted with a sealed special pin connections for joining individual lengths of cable (pipe).

Fall drilling string in the specified layout using standard drilling equipment - drilling winches, pipe turning machine driver and towers. The free descent of the unit contributes to the unloaded state of the stop face 13, which does not cause actuation of the thrust levers 15, their impact on the levers of the latch 16 and the deflection of the latter to the walls of the borehole 17.

When putting on the face (figure 2) emphasis downhole 13 rests on the bottom, when this rod 14 is moved in the guide rails (under the weight of the column of pipes and hydraulic units). Moving elements of the thrust levers 15 are moved along the taper lock hole 13, acting on the levers of the latch 16, causing their rejection to the walls of the borehole 17. Deviating, they pressed firmly to the walls of the borehole and recorded. Thus due to the friction forces arising is recorded on the borehole wall is rigidly connected with a focus borehole 16 of the housing 10, and the e United with him housing (stators 8 and 9), accordingly, the turbodrill 10.2, and drill 10.1. While the perceived share of the reactive moments from the twisting of the drill string is ready to be transmitted on the walls of the well.

The top of the drill string at the wellhead is attached by means of a rotary table of the drilling rig, and the necessary force on the hydraulic unit is created by the weight of the drill string, adjustable by means of a winch (Shamshev F.A., Cockroaches, S.N., Kudryashov B.B. and other Technology and engineering exploration drilling. M., Nedra, 1983, str).

On the surface of the cable from the unit connected to electropneumatically - shaper signal 26.

The springs 12 are designed to center drill 9 in the well.

Running the unit in SHES as follows.

Water from an underground aquifer interval 2 is fed into the borehole 1. Open valve 7 and direct the flow of water from a surface source into the borehole. Water from the springs of water enters the borehole, while it is the dynamic level and the appropriate level of pressure Hbottoms=450 m, and the water from it in a continuous stream moves with a total flow rate equal to 0.02 m3/zone flow (absorption) 4. Formed SHIP moves along the circular channel of the well to the zone of flow 4 and the holes 11 is fed to the blades 8.1 and 8.2 of the turbodrill 8, causing rotation of eg the rotor 8. The rotation of the rotor of the mud motor is transmitted to the armature-spindle drill 9 (electric generator)that is connected to the rotor of the mud motor. The hydraulic capacity of the stream of water in the well is equal to 88,2 kW, hydraulic unit is converted into electrical power in the form of electric current through the electric cable 20 is transmitted to the surface and enters electroprecipitation - shaper signal 26. In it, the energy is converted and is formed by taking the parameters regulated by the normative documents (GOST 13109-97. Standards power quality in electrical systems General purpose. M., Publishing house of standards, 1996).

From electropneumatically - shaper signal 26 electricity regulated quality and required quantity, capacity, equal to 65 kW produced by the downhole hydroelectric power plant with the use of the claimed unit is distributed and sent to the consumers.

In the absence of drawworks, in cases when the weight of the drill string exceeds the permissible load on the turbine and downhole motor-generator, to reduce it can be used disposable device, such as a Jack, which is connected with the upper end of the drill string. In necessary cases, they created the relief well effort is part of the load weight BU the strong column to the desired level.

Application of known mud motor and drill through to mount on the implementation of the fixation of their stators in the bore and bearing on the bottom for future electricity generation in the wells hydroelectric and transmission of the generated electricity on the surface from the bottom became possible thanks found the author of the features of the claimed invention aimed at achieving the desired technical result.

Using well-known turbo-drill and drill as a unit of wells hydroelectric cheaper and easier in comparison with other options that provide additional conducting research and development projects. The use of the turbo-drill and drill as downhole hydraulic unit hydraulic station and electrical cables carrying role where he plays the drill string, will reduce the development costs of the special unit of the downhole hydro and electric cables for power transmission from downhole to the surface and due to this to save cash.

The suitability of the proposed unit to the drilling process, sovmestimosti operation installation and operation with the operations of the drilling process allow its installation and operation with minimal cost.

It should be noted that the pre is obrazovaniya various hydraulic capacity in the hole in the electric power SGAS, for the formation of a standard series of units can be used in the claimed solution of various turbodrills and multiple layout as well as different (power and diameters) electric drills.

The downhole unit hydropower plants, including a turbine connected to a generator installed in the borehole, the cable connecting the generator on the surface with electroprecipitation, wherein the turbine is a mud motor, a generator - electric drill, which is coupled to, and are connected through a common housing with the slots to the bottom of the housing is connected to the node record, including a focus downhole, the latch levers and the thrust levers, sliding elements are mounted for movement on the cone stops downhole, acting on the levers of the latch, causing their rejection to the walls of the well, the hydraulic unit is equipped with a discharging device such as a Jack, United with the upper end of the drill string.



 

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