ISO 15136-2:2006 石油および天然ガス産業—人工リフト用の進歩的なキャビティポンプシステム—パート2：表面駆動システム | ページ 6

3.1

applied torque

torque that is applied to the top of the drive string by the surface-drive system

3.2

auxiliary equipment

equipment or components that are outside the scope of this part of ISO 15136 and are typically selected and/or installed by the user/purchaser; examples are sheaves and belts, motors, polished rod clamps, guards, motor controllers and torque limiting devices

3.3

axial-load capacity

maximum allowable load that can be supported by the structure independent of auxiliary equipment capabilities

3.4

backspin

process by which the progressing cavity pump, the drive string and the power train turn in the direction opposite to normal operation and which is driven by the release of the torsional and fluid potential energy

3.5

backspin-resisting torque

torque applied to the drive string to resist backspin

3.6

brake-engagement speed

rotational speed at which the brake system engages during backspin

3.7

bottom-drive system

PCP drive system utilizing a downhole prime mover

3.8

brake system

system that provides controlled resistance to backspin

3.9

drive string

device transmitting power (usually sucker rods) between the surface-drive system and the PCP

3.10

dynamic fluid level

depth from the wellhead to the top of the liquid column in the casing-tubing annulus under dynamic conditions

3.11

direct drive

type of surface-drive system with no internal gear reduction

3.12

driver sheave

pulley mounted on the prime mover shaft in belt driven surface-drive systems

3.13

driven sheave

pulley mounted on the main shaft in belt-driven surface-drive systems

3.14

flow rate

volume of fluid pumped per unit of time

3.15

fluid potential energy

energy stored in the production system due to the difference in fluid levels between the production tubing and the tubing-casing annulus

3.16

fluid head

pressure exerted by the fluid above the downhole pump

3.17

friction torque

resistance to rotation of the drive string (inside the tubing) and the rotor (inside the stator) that is dependent upon factors including (but not limited to) well depth and trajectory, pump geometry and interference fit between rotor and stator, and stuffing box characteristics

3.18

gear-reduction drive

type of surface-drive system with an internal gear reduction

3.19

heat capacity

total energy absorbed by the surface-drive system divided by the change in surface-drive system temperature

3.20

heat dissipation rate

rate at which energy is dissipated from the surface-drive system to its surroundings in the form of heat

3.21

hydraulic drive

type of surface-drive system powered by a hydraulic prime mover

3.22

hydraulic torque

torque induced by the differential pressure across the PCP acting on its effective cross-sectional area

3.23

input power rating

maximum allowable power, which may be supplied to the surface-drive system

3.24

job lot

batch of material or components that have undergone the same process or series of processes

3.25

job-lot traceability

the ability of parts to be identified as originating from a job lot which identifies the included heat(s)

3.26

main shaft

central shaft of the surface drive that is connected to the drive string

3.27

maximum backspin speed

maximum speed allowed at the main shaft that will not compromise the integrity of the surface-drive system or auxiliary equipment

3.28

maximum dynamic fluid level

maximum operating fluid level in the annulus as measured from the surface that ensures that, after a shutdown, the rotating speed does not exceed the maximum backspin speed for the surface-drive system

3.29

maximum operating torque

maximum allowable operating torque applied at the main shaft as specified by the supplier/manufacturer

3.30

moment of inertia

ratio of the torque applied to the rotating components of the surface-drive system divided by the angular acceleration of those components about a common axis

3.31

operating speed range

range defined by the minimum and maximum operating speeds for the surface-drive system as specified by the supplier/manufacturer

3.32

operating temperature range

range defined by the minimum and maximum operating temperatures for the surface-drive system as specified by the supplier/manufacturer

3.33

polished-rod stick-up

length of polished rod extending above the top of the polished rod clamp

3.34

power train

components of the surface-drive system and auxiliary equipment which transmit power from the prime mover into the drive string

Note 1 to entry: Includes belts, sheaves, gears, direct coupling or other combinations to achieve the required output.

3.35

prime mover

motor (typically hydraulic, electric or internal combustion) providing the torque to the power train

3.36

production system

assembly of equipment that includes the downhole pump, drive string, production tubing, well casing, surface-drive system, and auxiliary equipment

3.37

progressing cavity pump

pump consisting of a stator and rotor whose geometry of assembly is such that it creates two or more series of lenticular, spiral, separated cavities

3.38

repair

activities that include disassembly, re-assembly and testing with or without the replacement of parts and can include, machining, welding, heat treating or other manufacturing operations

3.39

surface-drive system

assembly of equipment that, when installed, transmits torque from a prime mover into a progressing cavity pump drive string, supports the loads transmitted by the drive string and controls backspin of the drive string as applicable

3.40

thrust bearing

device within a surface-drive system that supports the axial load transmitted by the drive string while allowing it to rotate

3.41

thrust-bearing rating

bearing manufacturer’s published statistical ratings that serve as guidelines in the prediction of bearing life expectancies under given conditions

3.42

torque-limiting device

device that prevents the surface-drive system from applying a torque to the drive string greater than a prescribed value

3.43

torsional energy

energy stored in the drive string due to torque-induced elastic deformation