WO2013180560A2 - Downhole screw motor - Google Patents
Downhole screw motor Download PDFInfo
- Publication number
- WO2013180560A2 WO2013180560A2 PCT/KZ2013/000006 KZ2013000006W WO2013180560A2 WO 2013180560 A2 WO2013180560 A2 WO 2013180560A2 KZ 2013000006 W KZ2013000006 W KZ 2013000006W WO 2013180560 A2 WO2013180560 A2 WO 2013180560A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing
- stator
- mud
- liquid
- gas
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0085—Adaptations of electric power generating means for use in boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
- E21B44/005—Below-ground automatic control systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0007—Radial sealings for working fluid
- F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/008—Pumps for submersible use, i.e. down-hole pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/90—Improving properties of machine parts
- F04C2230/91—Coating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
Definitions
- the invention relates to drilling equipment.
- a downhole screw motor comprising a body; a stator, fixed inside a body; a rotor, placed inside a stator; a spindle assembly; in the above motor the cover (made of elastomer, for example, rubber) fixed on the stator and having an internal screw surface, is used as contact elastic sealing agent between a metal rotor and a stator.
- the cover made of elastomer, for example, rubber
- a downhole screw motor comprising a body; a stator, fixed inside a body, a rotor placed inside a stator; the quantity of screw lobes of a rotor is one less than a stator, a spindle assembly; in the motor the cover (made of elastomer, for example, rubber) applied on the metal frame of a rotor, is used as contact elastic sealing agent between a rotor and a stator.
- a downhole screw motor comprising a body; a stator, fixed inside a body; a rotor, placed inside a stator; the quantity of screw lobes of a rotor is one less than a stator, a spindle assembly; in the motor the following system is used as a sealing system - screw cavities have been milled on the body; hollow hoses of special pro- file are put inside above screw cavities; one end of a special profile hose is plugged, and other end is connected to a common manifold; above the hoses, inside the body a rubber stator is cured-on so that stator' s screw surface is coincident with screw cavities of a body; the hose cavity through manifold and back pressure valve built in a body are filled in with oil under pressure and by that the hoses filled by oil to a certain level, are designed for com- pensating for wear of a stator top.
- the applied sealing agents are characterized by increased wear, reduced strength, reduced heat-resistant feature, not wide temperature and pressure range for operation, impossibility of efficient control for the sealing agent temperature to maintain a constant working temperature, impossibility to eliminate the overheating resulting in rubber destruction; the use of rubber for the sealing of moving elements in known downhole motors reduce the effectiveness, performance coefficient and motor operational life, decrease drilling efficiency.
- Technical object of the invention is creation of a new downhole screw motor removing the above mentioned disadvantages of prior art, which will ensure a higher effectiveness, increasing performance coefficient of a motor and motor operational life, improving of drilling efficiency.
- a sealing system a spindle assembly in accordance with an invention as a sealing system
- a system which consists of a contact elastic, multilayered sealing agent rigidly connected either with a stator or with a rotor or consists of two sealing agents, which are separately rigidly connected one with a stator, the other with a rotor; moreover a tough straps (made of strong material, for example, metal) making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers gas and/or liquid is used as sealing media; a sealing system contains a separation joint of drilling mud flow, electro generating turbine, a pumping unit
- Fig. 1 is a general scheme of an offered downhole screw motor.
- Fig. 2 is a scheme containing a part of contact elastic, multilayered sealing agent,
- Fig. 3 and Fig. 4 are sectional elevations A and B accordingly.
- a downhole screw motor comprises a stator 1, a rotor 2, a sealing system containing a separation joint of drilling mud flow 3, a contact elastic, multilayered sealing agent 4, rigidly connected with a stator 1 , moreover a tough straps 5 making layers in a sealing agent 4, have close ring-like shapes and are similar to the surface, to which they are fixed, tank- stabilizer with gas 6, a compressor 7, tank- stabilizer with liquid 8, a pump 9, a heat ex- changer for gas cooling 10, a heat exchanger for liquid cooling 1 1 , an electrogenerating turbine (electric generator) 12, pumping unit for drill mud 13, regulating units of movement direction of sealing media and drill mud 14 (for example, back pressure valves), a mud hopper 15, ACS 16.
- a stator 1 a rotor 2
- a contact elastic, multilayered sealing agent 4 rigidly connected with a stator 1 , moreover a tough straps 5 making layers in a sealing agent 4 have
- sealing media gas- 18 and liquid -19 are used in a downhole screw motor.
- Offered downhole screw motor operated as follows.
- High pressure supplied drill mud enters a separation joint of drilling mud flow 3 and is divided into three flows.
- the first flow forms a main flow of drill mud and is consumed directly for operation of a downhole screw motor providing a running torque of a rotor 2 relative to a stator 1.
- the second flow is directed to an electrogenerating turbine 12, the third flow - to heat exchanger for gas cooling 10 and heat exchanger for liquid cooling 1 1.
- Drill mud is a working substance of an electrogenerating turbine 12, drill mud passing through an electrogenerating turbine generates electric energy to power equipment ele- ments.
- Drill mud also used as cooling agent in heat exchangers 10 and 11, applied in order to control temperature of sealing media of a sealing system of an offered downhole screw motor.
- a separation joint of drilling mud flow 3 is managed by ACS 16, which increases or decreases the quantity of bleed drill mud for the operation of electrogenerating turbine 12 depending on required horse power of appropriate consumer of an offered device. Also under the control of ACS a separation joint of drilling mud flow 3, changing the quantity of drill mud delivered to heat exchangers 10 and 11, ensures the temperature control of sealing media (gas and liquid) in a sealing system. Managed by ACS 16 tank-stabilizers 6 and 8, a compressor 7, a pump 9, heat exchangers 10 and 11 regulate pressure and flow rate of seal-
- Tank-stabilizer with gas 6 and tank-stabilizer with liquid 8 allow operating relatively a compressor 7 and a pump 9 with different efficiency, depending on the change of power
- tank- stabilizers 6 and 8 ensures the presence of initial pressure and ensures the possibility of compensation of dynamic impulse and temperature expansion of gas and liquid during the operation and motion of a drilling system in rock formation having a definite temperature gradient.
- Tank-stabilizers 6 and 8 together with a compressor 7 and a pump 9 allow control 0 a sealing system creating an opportunity to control rotational torque on a rotor 2 within a specified range, namely bypassing through a contact elastic, multilayered sealing agent 4 more or less of sealing media.
- Availability of a compressor 7 and a pump 9 ensures continuous pumping of sealing media through sealing layers 4, as well as through heat exchangers for gas and liquid 10 and 5 11.
- Sealing media (gas and liquid) heated during operation enter relatively to heat exchangers 10 and 1 1.
- Heat removal is ensured by delivery of drill mud as a cooling agent as per classical scheme for such type of equipment.
- Regulating units of movement direction of sealing media and drill mud 14 applied in the device prevent the back motion of drill mud and sealing media (gas and liquid), ensure the unidirectionality of motion.
- a mud hopper 15 0 ensures the delivery of a waste drilling mud after heat exchangers 10 and 1 1 and after electrogenerating turbine 12 back to main flow of drill mud and directs it to a pumping unit for drill mud 13.
- drill mud is sent directly to hollow spaces of operating chambers of a gerotor mechanism, the hollow spaces formed by a stator 1 and a rotor 2.
- a rotational torque, arising on a rotor 2 causes its eccentric motion regarding a stator 1, the eccentric motion then transforms into rotating motion of a shaft of a spindle assembly (not shown in Figures.).
- Drill mud from operating chambers enters rock destruction tool and then the downhole.
- sealing media may be composed of liquid and gas phases
- the layers in sealing agent may be composed of liquid of similar or different density and viscosity, and may contain or not contain the layer with gas phase - the choice of sealing media depends on a designated task.
- One of the best options of an offered subject is above described case when the layers of sealing media, containing separately gas and liquid, interchange in a contact elastic, multi- layered sealing agent; in case of such interchange of layers, optimum efficiency of control of elastic and heat exchange properties of system can be reached.
Abstract
To obtain technical result - creation of a new downhole screw motor ensuring a higher efficiency and increasing performance coefficient of a motor and motor operational life, improving of drilling efficiency - in a downhole screw motor comprising a stator hav¬ ing an internal screw surface, a rotor placed inside a stator having external screw surface, a sealing system, a spindle assembly, as per the invention as a sealing system the following system is used: a system, which contains a contact elastic, multilayered sealing agent, moreover a tough straps making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers separately gas and/or liquid is used as sealing media; a seal¬ ing system contains a separation joint of drilling mud flow, an electrogenerating turbine, a pumping unit for drill mud, regulating units of movement direction of sealing media and drill mud, a mud hopper, automatic control system and also, in accordance with applied sealing media, a tank-stabilizer with gas, a compressor, a heat exchanger for gas cooling and/or a tank-stabilizer with liquid, a pump, a heat exchanger for liquid cooling.
Description
DOW HOLE SCREW MOTOR
Technical Field
The invention relates to drilling equipment.
Background Art
It is known a downhole screw motor comprising a body; a stator, fixed inside a body; a rotor, placed inside a stator; a spindle assembly; in the above motor the cover (made of elastomer, for example, rubber) fixed on the stator and having an internal screw surface, is used as contact elastic sealing agent between a metal rotor and a stator. (Baldenko D. F., Baldenko F. D., Gnoyevykh A. N. Downhole screw motors: Information Manual - M.: OJSC ((Publishing Office «Nedra», 1999, 375 Page).
It is known a downhole screw motor comprising a body; a stator, fixed inside a body, a rotor placed inside a stator; the quantity of screw lobes of a rotor is one less than a stator, a spindle assembly; in the motor the cover (made of elastomer, for example, rubber) applied on the metal frame of a rotor, is used as contact elastic sealing agent between a rotor and a stator. (Patent RU JNb 2011778, IPC E 21 B 4/02 dated 30.04.1994).
Closest analogous solution is a downhole screw motor comprising a body; a stator, fixed inside a body; a rotor, placed inside a stator; the quantity of screw lobes of a rotor is one less than a stator, a spindle assembly; in the motor the following system is used as a sealing system - screw cavities have been milled on the body; hollow hoses of special pro- file are put inside above screw cavities; one end of a special profile hose is plugged, and other end is connected to a common manifold; above the hoses, inside the body a rubber stator is cured-on so that stator' s screw surface is coincident with screw cavities of a body; the hose cavity through manifold and back pressure valve built in a body are filled in with oil under pressure and by that the hoses filled by oil to a certain level, are designed for com- pensating for wear of a stator top. (Inventor's Certificate USSR s 1717782 Al, IPC
E 21 B 4/02 dated 07.03.1992).
In all of these prior arts, elastomer - rubber used for sealing purpose, has the following ineffective physical and mechanical characteristics:
For example, in comparison with steel, there is a high friction coefficient for the pair rub- ber-steel and pair rubber-rubber, low tensile strength, low heat (Patent RU N° 2145012, IPC F 16 F 15/00 dated 27.01.2000; Chemical Encyclopaedical Dictionary / Head Editor
I. L. Knunyants. - Moscow: Soviet Encyclopedia, 1983. - 791 Pages).
Due to ineffective physical and mechanical characteristics of rubber, prior art has common disadvantages: the applied sealing agents are characterized by increased wear, reduced strength, reduced heat-resistant feature, not wide temperature and pressure range for operation, impossibility of efficient control for the sealing agent temperature to maintain a constant working temperature, impossibility to eliminate the overheating resulting in rubber destruction; the use of rubber for the sealing of moving elements in known downhole motors reduce the effectiveness, performance coefficient and motor operational life, decrease drilling efficiency.
Summary of Invention
Technical object of the invention is creation of a new downhole screw motor removing the above mentioned disadvantages of prior art, which will ensure a higher effectiveness, increasing performance coefficient of a motor and motor operational life, improving of drilling efficiency.
In order to solve this technical object in a downhole screw motor comprising a stator having internal screw surface; a rotor having external screw surface and placed inside stator, the quantity of screw lobes of a rotor is one less than of a stator; a sealing system, a spindle assembly in accordance with an invention as a sealing system the following system is used: a system, which consists of a contact elastic, multilayered sealing agent rigidly connected either with a stator or with a rotor or consists of two sealing agents, which are separately rigidly connected one with a stator, the other with a rotor; moreover a tough straps (made of strong material, for example, metal) making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers gas and/or liquid is used as sealing media; a sealing system contains a separation joint of drilling mud flow, electro generating turbine, a pumping unit for drill mud, regulating units of movement direction of sealing media and drill mud (for example, back pressure valves), a mud hopper, automatic control system (hereinafter, ACS), as well as in accordance with applied sealing media, tank-stabilizer with gas, a compressor, a heat exchanger for gas cooling and/or tank-stabilizer with liquid, a pump, a heat exchanger for liquid cooling.
The conceptual design and function of the above mentioned contact elastic, multi- layered sealing agent is described in the original source (Innovative Patent KZ N° 23655, IPC F16J 15/16 dated 17.01.2012).
The concept of the invention is illustrated by schematic drawings, describing one of
the best options of offered subject containing contact elastic, multilayered sealing agent rigidly connected with a stator; in the agent in the layers gas and liquid in the order of interchange are used as sealing media. Reviewing of these schemes is enough to understand the concept of the invention.
Brief Description of Drawings
Fig. 1 is a general scheme of an offered downhole screw motor. Fig. 2 is a scheme containing a part of contact elastic, multilayered sealing agent, Fig. 3 and Fig. 4 are sectional elevations A and B accordingly.
Modes for Carrying out the Invention
A downhole screw motor comprises a stator 1, a rotor 2, a sealing system containing a separation joint of drilling mud flow 3, a contact elastic, multilayered sealing agent 4, rigidly connected with a stator 1 , moreover a tough straps 5 making layers in a sealing agent 4, have close ring-like shapes and are similar to the surface, to which they are fixed, tank- stabilizer with gas 6, a compressor 7, tank- stabilizer with liquid 8, a pump 9, a heat ex- changer for gas cooling 10, a heat exchanger for liquid cooling 1 1 , an electrogenerating turbine (electric generator) 12, pumping unit for drill mud 13, regulating units of movement direction of sealing media and drill mud 14 (for example, back pressure valves), a mud hopper 15, ACS 16. (It should be noted that in case when two separate contact elastic multi- layered sealing agents, one of which rigidly connected with a stator, and the other with a rotor, are used; drill mud moves between these sealing agents). At the same time drill mud specified as 17, sealing media: gas- 18 and liquid -19 are used in a downhole screw motor.
Offered downhole screw motor operated as follows.
High pressure supplied drill mud enters a separation joint of drilling mud flow 3 and is divided into three flows. The first flow forms a main flow of drill mud and is consumed directly for operation of a downhole screw motor providing a running torque of a rotor 2 relative to a stator 1. The second flow is directed to an electrogenerating turbine 12, the third flow - to heat exchanger for gas cooling 10 and heat exchanger for liquid cooling 1 1. Drill mud is a working substance of an electrogenerating turbine 12, drill mud passing through an electrogenerating turbine generates electric energy to power equipment ele- ments. Drill mud also used as cooling agent in heat exchangers 10 and 11, applied in order to control temperature of sealing media of a sealing system of an offered downhole screw motor. A separation joint of drilling mud flow 3 is managed by ACS 16, which increases or decreases the quantity of bleed drill mud for the operation of electrogenerating turbine 12 depending on required horse power of appropriate consumer of an offered device. Also
under the control of ACS a separation joint of drilling mud flow 3, changing the quantity of drill mud delivered to heat exchangers 10 and 11, ensures the temperature control of sealing media (gas and liquid) in a sealing system. Managed by ACS 16 tank-stabilizers 6 and 8, a compressor 7, a pump 9, heat exchangers 10 and 11 regulate pressure and flow rate of seal-
5 ing media (gas and liquid), increasing or decreasing permeability of clearance between a stator and a rotor, in the same way allow to regulate rotational torque of a downhole screw motor and to control drilling process, it is of great importance and significantly distinguishes an offered subject matter from the prior art. ACS 16, besides the specified operations of regulation and control, ensures the forcing of drill mud through electrogenerating turbine
10 12, regulating units of movement direction of sealing media and drill mud 14 and provides the delivery of waste mud to pumping unit for drill mud 13 followed by accompanied by connection with main flow of drill mud.
Tank-stabilizer with gas 6 and tank-stabilizer with liquid 8 allow operating relatively a compressor 7 and a pump 9 with different efficiency, depending on the change of power
15 on a shaft of a rotor 2 of a downhole screw motor. Additionally the design of tank- stabilizers 6 and 8 ensures the presence of initial pressure and ensures the possibility of compensation of dynamic impulse and temperature expansion of gas and liquid during the operation and motion of a drilling system in rock formation having a definite temperature gradient. Tank-stabilizers 6 and 8 together with a compressor 7 and a pump 9 allow control 0 a sealing system creating an opportunity to control rotational torque on a rotor 2 within a specified range, namely bypassing through a contact elastic, multilayered sealing agent 4 more or less of sealing media.
Availability of a compressor 7 and a pump 9 ensures continuous pumping of sealing media through sealing layers 4, as well as through heat exchangers for gas and liquid 10 and 5 11. Sealing media (gas and liquid) heated during operation enter relatively to heat exchangers 10 and 1 1. Heat removal is ensured by delivery of drill mud as a cooling agent as per classical scheme for such type of equipment. Regulating units of movement direction of sealing media and drill mud 14 applied in the device prevent the back motion of drill mud and sealing media (gas and liquid), ensure the unidirectionality of motion. A mud hopper 15 0 ensures the delivery of a waste drilling mud after heat exchangers 10 and 1 1 and after electrogenerating turbine 12 back to main flow of drill mud and directs it to a pumping unit for drill mud 13. Then drill mud is sent directly to hollow spaces of operating chambers of a gerotor mechanism, the hollow spaces formed by a stator 1 and a rotor 2. A rotational torque, arising on a rotor 2, causes its eccentric motion regarding a stator 1, the eccentric
motion then transforms into rotating motion of a shaft of a spindle assembly (not shown in Figures.). Drill mud from operating chambers enters rock destruction tool and then the downhole.
Based on practical experiments concerning the development of thermal conditioning of multilayered sealing agent in order to maintain its operational temperature, it is reasonable to limit the quantity of layers of a sealing agent to no more than six. The condition required the quantity of layers not more than six is connected with the fact that if the quantity of layers more than six, heat-exchange efficiency related to sealing agent will increase slightly, in particular, temperature gradient will change slightly and, accordingly, the further increasing of layers makes no sense.
It should be also noted that as it was mentioned above in an offered subject sealing media may be composed of liquid and gas phases, moreover the layers in sealing agent may be composed of liquid of similar or different density and viscosity, and may contain or not contain the layer with gas phase - the choice of sealing media depends on a designated task. One of the best options of an offered subject is above described case when the layers of sealing media, containing separately gas and liquid, interchange in a contact elastic, multi- layered sealing agent; in case of such interchange of layers, optimum efficiency of control of elastic and heat exchange properties of system can be reached.
Claims
A downhole screw motor comprising a stator having an internal screw surface, a rotor placed inside a stator having external screw surface, the quantity of screw lobes of a rotor is one less than a stator, a sealing system, a spindle assembly is different in that as a seal- ing system the following system is used: a system, which contains a contact elastic, multi- layered sealing agent rigidly connected either with a stator or with a rotor or contains two sealing agents, which separately rigidly connected one with a stator, the other with a rotor, moreover a tough straps (made of strong material, for example, metal) making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers separately gas and/or liquid is used as sealing media; a sealing system comprises , a separation joint of drilling mud flow, an electrogenerating turbine, a pumping unit for drill mud, regulating units of movement direction of sealing media and drill mud, a mud hopper, automatic control system and also, in accordance with applied sealing media, a tank-stabilizer with gas, a compressor, a heat exchanger for gas cooling and/or a tank-stabilizer with liquid, a pump, a heat exchanger for liquid cooling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/398,128 US20150114722A1 (en) | 2012-05-30 | 2013-05-06 | Downhole screw motor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KZ2012/0632.1 | 2012-05-30 | ||
KZ20120632 | 2012-05-30 |
Publications (2)
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WO2013180560A2 true WO2013180560A2 (en) | 2013-12-05 |
WO2013180560A3 WO2013180560A3 (en) | 2014-10-02 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/KZ2013/000006 WO2013180560A2 (en) | 2012-05-30 | 2013-05-06 | Downhole screw motor |
Country Status (3)
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US (1) | US20150114722A1 (en) |
EA (1) | EA024018B1 (en) |
WO (1) | WO2013180560A2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN105525867B (en) * | 2015-07-02 | 2018-07-03 | 山东东远石油装备有限公司 | Cladding has helicoid hydraulic motor rotor of ceramic coating and preparation method thereof |
CN107819363B (en) * | 2016-09-12 | 2020-01-07 | 中国石油天然气集团公司 | Motor stator and manufacturing method thereof |
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2013
- 2013-05-06 WO PCT/KZ2013/000006 patent/WO2013180560A2/en active Application Filing
- 2013-05-06 EA EA201300574A patent/EA024018B1/en not_active IP Right Cessation
- 2013-05-06 US US14/398,128 patent/US20150114722A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
US20150114722A1 (en) | 2015-04-30 |
EA201300574A1 (en) | 2013-12-30 |
EA024018B1 (en) | 2016-08-31 |
WO2013180560A3 (en) | 2014-10-02 |
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