GB2099620A - Apparatus for counting turns when making threaded joints including an increased resolution turns counter - Google Patents
Apparatus for counting turns when making threaded joints including an increased resolution turns counter Download PDFInfo
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- GB2099620A GB2099620A GB8210308A GB8210308A GB2099620A GB 2099620 A GB2099620 A GB 2099620A GB 8210308 A GB8210308 A GB 8210308A GB 8210308 A GB8210308 A GB 8210308A GB 2099620 A GB2099620 A GB 2099620A
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- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/165—Control or monitoring arrangements therefor
- E21B19/166—Arrangements of torque limiters or torque indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
- B23P19/065—Arrangements for torque limiters or torque indicators in screw or nut setting machines
- B23P19/066—Arrangements for torque limiters or torque indicators in screw or nut setting machines by electrical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Power Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Apparatus is provided for facilitating the control of the threading of one threaded member into another to make a threaded joint. Means are provided for generating an actual turns signal by dividing down a high frequency (e.g. 10,000 pulses per revolution) signal responding to the speed of rotation of the one member, the division ratio being variable to suit a particular pulse generator to the diameter of the particular threaded member. Means may be provided for utilising such a signal either for automatic control of the turning or for giving an indication that the rate of turn should be controlled. The apparatus is particular described in relation to pipe strings run into bore holes of oil or gas wells. <IMAGE>
Description
SPECIFICATION
Apparatus for counting turns when making threaded joints including an increased resolution turns counter
The present invention relates in general to an apparatus for monitoring the operation of making threaded tubular joints and in particular to an apparatus for counting the number of turns in such an operation.
After a bore hole has been drilled to an oil or gas deposit, pipe strings are run into the bore hole for removing the oil or gas. The pipe strings are assembled at the well site from pipe sections each having external threads at one end and an internally threaded box member at the other end or external threads at both ends for use with an internally threaded coupling collar. As the pipe sections are connected together, they are run into the bore hole. Each pipe section is assembled to the top of the pipe string utilising a power tongs unit which has a rotary jaw member for gripping the pipe and a motor for rotating the jaw member until the pipe section has been tightened to the desired degree. The joint must be tight enough to prevent leakage and to develop high joint strength but not so tight as to damage the threads.
Early prior art techniques involve the determination of the applied torque to achieve the desired degree of tightness in the joints. For example, one technique involved the adjusting of the air supply maximum output pressure to a pneumatically driven tong motor to provide the required maximum torque as dictated by joint properties and tong power characteristics. Thus, the proper torque was developed when the tong motor stalled. Another technique involved the counting of the number of turns after the threads had been engaged at a "hand tight" point. These early techniques were unsatisfactory since torque alone or turns alone could not guarantee that the threaded joint would not leak.
One prior art device which attempted to solve the problem included means for producing a signal indicating the number of turns of the pipe section after measurement of a given torque by the torque measuring means. The device produced a warning of a bad joint upon the measurement of a predetermined maximum torque before a measurement of a predetermined minimum number of turns has occurred or the measurement of the predetermined maximum number of turns before the measurement of the predetermined minimum torque had occurred.
The device indicated a good joint upon the measurement of the predetermined minimum torque value between the measurement of the minimum and maximum number of turns. Such a device is shown in U.S. Pat. No. 3,368,396 issued Feb. 13, 1968. Improvements to that device are disclosed in U.S. Pat. No. 3,606,664 issued Sept.
21, 1971, U.S. Pat. No. 3,745,820 issued July 17, 1973, and U.S. Pat. No.4,091,451 issued
May 23, 1978.
U.S. Patent No. 4,176,436 discloses a method
and an apparatus for making threaded joints
within a wide range of predetermined applied
torque and turns values. A pipe or a pipe and a
coupling are threaded onto the end of a pipe
string. The applied torque is monitored and, when
a reference torque value is exceeded, the number
of turns are counted. When either the actual torque or the actual turns exceeds a
predetermined minimum value for that parameter
and the value of the other parameter exceeds a
predetermined minimum value, but is less than a
predetermined maximum value, a good joint is indicated and the make-up is stopped. A bad joint is predicted and-make-up is stopped when the value of the actual torque divided by the actual turns falls outside a range of values defined by the slopes of a pair of boundary lines and predetermined minimum torque and minimum turn values.The actual turns value is a count which is initiated the first time the actual torque value equal the reference torque value, the count being incremented with the actual torque value is greater than the reference torque value being decremented when the actual torque value is less than the reference torque value.
With each of these devices, galling, the tearing or deforming of the threads on a pipe or coupling, can be a problem. Galling can be substantially reduced or eliminated by limiting the relative speed of rotation between the two members being threaded together.
The prior art devices typically used turns counters which generated a signal representing one tenth of a revolution of the joint member.
Such a low resolution is not suitable for making joints where there may be less than one complete turn between the reference torque and the maximum torque. Furthermore, each time a different pipe diameter was utilised, the devices
had to be recalibrated to generate the one tenth of a turn signal. For example, if the rotation of the joint member was sensed by a wheel engaging the outer surface of the joint member, a different diameter wheel has to be substituted to maintain the same ratio of joint member diameter to wheel diameter. Furthermore, the prior art devices lack the speed control required to effectively prevent galling.
In one aspect of the invention an apparatus for counting the number of turns made by one threaded member being rotated during the making of a threaded joint from a pair of threaded member comprises means responsive to the rotation of the one member for generating a first plurality of pulses at a first frequency proportional to the speed of rotation of the one member and means responsive to the first plurality of pulses for generating an actual turns signal as a second plurality of pulses at a second frequency lower than the first frequency, each pulse of the second plurality representing a predetermined increment of rotation of the one member.
Preferably an idler wheel is biased into engagement with the outer surface of the joint member being rotated. The idler wheel is coupled to an encoder which generates a pulse train having a relatively high number of pulses per revolution of the idler wheel. A presettable divideby-N counter receives the pulse train and generates an output pulse for each "N" input pulses. The output pulses are utilised by an apparatus for controlling the number of turns made and the torque applied during the operation of making a threaded joint.
The number "N" can be selected to provide pulses representing a predetermined increment of rotation of the joint member or a predetermined percentage of a number of turns to be made.
For example, if the encoder generates 10,000 pulses per revolution of the idler wheel and the joint member outside diameter is five times the diameter of the idler wheel, then the encoder generates 50,000 pulses for each revolution of the joint member. If "N" is selected to be 500, the divide-by-N counter will generate output pulses representing 1/100 of a revolution of the joint member. If 0.7 turn is to be made, then "N" is selected to be 350 and each output pulse represents one percent of 0.7 turn.
Furthermore, the number "N" can be selected to accommodate a wide range of joint member diameters. If the joint member diameter were changed to be six times the idler wheel diameter, the numbers 500 and 350 become 600 and 420 respectively to generate the same number of output pulses. Thus, the idler wheel does not have to be changed as in the prior art turns counters.
In another aspect of the invention an apparatus for controlling the speed of rotation of a joint member during the operation of making a threaded joint includes a means for comparing the rate at which pulses are generated by a turns counter with a desired maximum rate. If the actual turns rate is greater than the maximum rate, a signal is generated to slow down the joint making operation. The signal can be a warning light to indicate to the operator of a joint making apparatus to slow down the rotation speed or a control signal to a valve in the hydraulic drive circuit for the joint making apparatus.The comparison can be made by accumulating a count total representing the elapsed time between the actual turns pulses or the number of actual turns pulses occurring during a predetermined time interval and by utilising minimum elapsed time and maximum number of pulses reference values respectively.
The invention includes apparatus for generating an output signal for use in controlling the speed of rotation of one threaded member with respect to another while making a threaded joint from the members and while generating a pulsed signal representing the actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, the apparatus comprising means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulses are being generated; means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member; and means responsive to said actual turns rate signal and the maximum rate for generating the output signal when the actual turns rate is greater than the same maximum rate.
The invention also includes apparatus for making threaded joints from a pair of threaded members including means for rotating one member with respect to the other member, means responsive to the rotation of the one memberforgenerating a pulsed signal representing the actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulsed are being generated; means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member; and means responsive to said actual turns rate signal and the maximum rate for generating an output signal when the actual turns rate is greater than the said maximum rate, and means responsive to the output signal either for controlling automatically the speed of rotation of the one member with respect to the other for giving an indication to the operator to control the speed of rotation of the one member with respect to the other.
The invention is now described with reference to the accompanying drawings in which:
Figure 1 is a block diagram of a prior art apparatus for threading pipe and a control system therefor which can utilise the turns counter according to the present invention.
Figure 2a is a plot of torque versus turns illustrating joint make-up values for typical joints.
Figure 2b is a plot of torque versus turns illustrating the turns averaging feature of the prior art apparatus.
Figure 3 is a block diagram of a high resolution turns counter according to the present invention.
Figure 4 is a block diagram of an apparatus for threading pipe and a control system therefor according to the present invention.
Figure 5 is a flow diagram for the computer in the apparatus shown in Figure 4 for warning the operator when a maximum rotation rate is exceeded.
Figure 6a and 6b are block diagrams of logic circuits for the control system shown in Figure 4 for warning the operator when a maximum rotation rate is exceeded.
Fig. 1 is a block diagram of a torque and turns controller which is disclosed in more detail in U.S.
Patent No. 4,176,436 to which reference should be made.
Reference numerals below 200 as used herein represent the same elements in the patent. A power tongs unit 21 grips and rotates a pipe section 22, the lower end of which is threaded into a pipe coupling 23 which, in turn, is threaded into the upper end of a pipe section 24. The pipe section 24 represents the upper end of a pipe string extending into the bore hole of a well (not shown). The power tongs unit 21 is well-known in the industry and is not shown in detail.
An upper turns counter 25 senses the rotation of the upper pipe section 22 and generates a signal representing such rotational movement.
Similarly, a lower turns counter 26 senses the rotation of the pipe coupling 23 and generates a signal representing the torque applied to the upper pipe section 22 by the power tongs unit 21.
The signals from the counters 25 and 26 and from the transducer 27 are inputs to a tong remote unit 28. A computer 29 monitors the counters and transducer signals and compares the present values of these signals with operator entered values to provide control signals to the operator. The operator enters values of low, minimum and maximum turns and reference, minimum and maximum torque through an input device, such as a keyboard, which can be included in a plurality of input/output devices 31. Turns counting will be started by the computer 29 when the joint reaches a reference or "hand tight" torque. When both the torque and turns criteria have been satisfied, the operator will be signalled by the computer through an output device such as a green light and a steady audio tone. The computer can signal a bad joint with a red light and a warbling audio tone.In addition, the computer can generate a dump signal through the tong remote unit 28 to the power tongs unit 21 to automatically shut down the power tongs upon reaching either a good or a bad joint. The computer 29 can also output signals representing the torque and turns values to a printer 32 such as a strip chart recorder or a digital printer, or a plotter, such as x-y plotter.
Tables are available of ranges of torque and
turns values which will result in a bearing
pressure sufficient to form a pressure seal in a
pipe joint. The minimum and maximum values for
both torque and turns are read from the tables
based upon the size, connection type, grade and
weight for each string of pipe. These maximum
and minimum values define an area 41 for a good
joint and a typical plot of torque versus turns is
shown in Fig. 2a. The counting of the turns begins
only after a metal-to-metal or hand tight make-up
has been achieved which is represented as the
reference "REF" dashed line 42. The REF torque
value provides a reference point after which a
predetermined number of turns applied will
induce a known stress in the joint provided that
the thread and its material are within the available
specifications.In practice, however, turns alone
cannot be relied upon to achieve proper stress
levels in sealing engagement, since it is
impractical to inspect each and every thread
property and dimensions. Nor does the
measurement of torque alone insure proper stress
levels and sealing engagement because
dimensional, material and frictional properties
vary. Through practical and theoretical analysis, it
has been shown that the make-up of threaded joints simultaneously within certain torque and turns parameters will insure joint integrity.
The computer 29 of Fig. 1 is responsive to the torque and turns signals for determining when a good joint has been made. When either a mimimum torque or a minimum turns value has been reached, the computer 29 will then look for the minimum value of the other parameter and signal the operator that a good joint has been made if that minimum value of the other parameter is reached before the maximum value for the first parameter is reached. Thus, during make-up of the joint represented by a circle 43, the computer senses that the minimum turns value has been reached before the minimum torque value and stopped the make-up of the joint when the minimum torque value was reached.
Conversely, during the make-up of the joint represented by a circle 44, the computer sensed the minimum torque value and, therefore, stopped the make-up of the joint when the minimum turns was sensed. A joint represented by a circle 45 reached the maximum torque value before the minimum turns value was reached indicating a dirty, rough, damaged, improperly lubricated, or dimensional out of tolerance thread. A joint represented by a circle 46 reached the maximum turns value before reaching the minimum torque value, indicating a worn or out of tolerance thread, a weak or incorrect thread or coupling material, or perhaps the use of a non-standard thread lubricant or coating.
It is desirable to avoid making the joints 45 and 46 since they waste time and, in the case of the joint 45, places more stress on the pipe string than is required. Therefore, the apparatus shown in Fig. 1 automatically predicts such bad joints and stops the joint making process. A bad joint is predicted when, after reaching minimum torque, actual torque divided by actual turns is greater than maximum torque divided by minimum turns.
These criteria define a boundary of an indicating area to the left of line 47 and above the minimum torque line as shown in Fig. 2a. A bad joint is also predicted when, after reaching minimum turns, the actual torque divided by the actual turns is less than the minimum torque divided by the maximum turns. These criteria define the boundaries of an indicating area below line 48 and to the right of the minimum turns line as shown in Fig. 2a. After either the torque or the turns value exceeds a corresponding minimum value, the computer monitors the actual torque and the actual turns values to prevent movement into one of the indicating areas defined above.
When movement into either indicating area is detected, the computer 29 of Fig. 1 turns on a light indicating that a bad joint is being made. The computer 29 can also generate a dump signal through the tong remote unit 28 to shut off the power tongs unit 21.
The torque and turns values shown in Fig. 2a can also be utilized to generate other warning signals. For example, when the actual torque value exceeds the reference torque value REF, a
light can be turned on to indicate to the operator to shift from a higher speed to a lower speed on the power tongs unit. Such operation increases the speed with which a joint can be made and decreases the chances of damaging the threads on either the pipe sections or the coupling. Where
the make-up line has reached either the minimum torque or the minimum turns value and is
predetermined percentage from the minimum value of the other parameter, a light can be
lighted to indicate to the operator that he should
be ready to shut down the power tongs unit since the joint is almost finished. Typically, the
percentage can be ninety percent.When the
make-up line reaches the minimum torque value
before reaching a LOW turns value, the make-up
process can be stopped because the threads are
probably misaligned and continued make-up will damage the threads.
The apparatus shown in Fig. 1 includes an automatic turns averaging feature. During the
make-up of a pipe, the torque does not increase
linearly with the turns. This is caused by such
factors as wind loading on the pipe and non
concentric pipe.
Fig. 2b is a plot of torque versus turns wherein
a straight dashed line represents the average
applied torque and the solid, wavy line
represents the actual torque which is applied. An
area 49 of the actual torque line extends above a
reference REF torque line and can represent one
of more turns counts before the average torque
exceeds the reference torque. An area 50 of the
actual torque line extends below the reference
torque line and can represent one or more turns
counts after the average torque exceeds the
reference torque.
In the prior art, the counting of turns was
initiated and continued uninterrupted after the
actual torque reached the REF torque line. Often,
conditions such as wind loading on the pipe or
non-concentric pipe would cause the actual
torque to reach or exceed the REF torque line
prematurely resulting in false turns being counted.
These false turns were largely ignored or left up to
the operator to observe and to compensate
therefore. Thus, the false turns became a point of
error. The apparatus shown in Fig. 1 automatically adjusts the turns count for false turns. The turns
are counted by an up/down counter which counts turns when the actual torque is above the
referenced torque and subtracts turns when the
actual torque is below the reference torque.
However, when counting, the counter will count down to zero, but never become negative.
In Fig. 3, there is shown a block diagram of a
turns counter and associated circuitry according
to the present invention. The turns counter 25', which may be mounted on the power tongs unit,
includes an idler wheel 201 connected to a drive
shaft 202. A spring means 203 is connected to
the drive shaft 202 to bias the idler wheel 201
against the outside surface of the pipe section 22.
As the pipe section 22 is rotated by the power
tongs unit 21 (Fig. 1), the idler wheel is rotated by frictional engagement with the pipe section The drive shaft 202 is coupled to the input of an optical encoder 204 which generates a pulse train output signal on a pair of lines 209 as the idler wheel is rotated.
The encoder 204 is well known, is commercially available and includes a wheel driven from the shaft 202 and having alternate clear and opaque sections (not shown) positioned about the periphery thereof. A light source is positioned on one side of the wheel and a photocell on the other side of the wheel. As the pipe section 22 rotates the idler wheel 201, the wheel in the encoder is rotated and the photocell detects alternate light and dark sections of the wheel. The photocell generates a square wave output signal each cycle of which represents an adjacent pair of clear and opaque sections and having a frequency proportional to the speed of rotation of the pipe section. The encoder 204 utilizes the photocell output signal to generate a pair of square wave pulse trains on the lines 209 ninety degrees out of phase.Thus, during each cycle of the photocell output signal, two leading and two trailing edges are generated between the pair of pulse trains. Other encoders, such as mechanical or magnetic could be used.
Typically, the pulse trains are generated with a large number of pulses per revolution of,the wheel. The two leading and two trailing edges can be utilized as inputs to a direction sensor circuit 210 to generate a square wave pulse train output signal on the line 71. Furthermore, the two pulse trains which are ninety degrees out of phase can be utilized to generate a signal representing the direction of rotation on a line 205.
The line 71 is connected to a counting input and the line 205 is connected to an inhibit input of a divide-by-N circuit 206. The circuit 206 is a presettable divide-by-N counter. The divide-by-N function may be accomplished with discrete logic circuitry or with a programmed microprocessor.
An N input circuit 207 is connected to a preset input of the divide-by-N circuit 206 for generating a signal representing the number "N". Typically, the preset input accepts binary signals and the N input circuit 207 includes means, such as switches, for setting "N" in terms of ones, tens, and hundreds. The circuit 207 converts the decimal input from the switches into a binary signal which is generated to the circuit 206 to define the number of "N". Of course, any suitable circuitry can be utilized to generate the "N" signal but the switches will maintain the number "N" during any power loss. The signal on the line 205 prohibits the divide by "N" circuit from outputting pulses to the computer 29 when the wheel 201 is rotating in the reverse direction.
A signal is sent on line 212 to the direction sensor 210 from the forward/reverse direction selector circuit 211. The circuit 211 allows the forward and reverse direction of the wheel 201 to be selected. Circuit 211 has a two position switch which is manually positioned by the operator. In one position when the wheel 201 rotates clockwise this is the forward direction and counter-clockwise is the reverse direction. When the switch is placed in the other position, clockwise rotation of the wheel 201 is the reverse direction and counter-clockwise rotation is the forward direction.
Each time a pulse is sent from the direction sensor 210 to the divide-by-N circuit 206 on line 71, when the wheel 201 is rotating in the forward direction, the number "N" is decremented. When the number "N" is counted down to zero, a pulse is then output on line 208 to the computer 29.
This pulse represents a predetermined increment of rotation. The number "N" is placed back into the divide-by-N circuit 206 and the process is continued. When the wheel 201 is rotating in the reverse direction the number "N" is incremented.
The divide-by-N circuit 206 counter will count up to a maximum value and then go to zero and then the number "N" is placed back into the counter and the process is continued.
As previously stated, the direction sensor
circuit 210 places a signal on line 205 which
prohibits the divide-by-N circuit 206 from
outputting a pulse to the computer 29 when the
wheel 201 is rotating in the reverse direction.
Since the turns counter 25 may be mounted on
the power tongs unit and if the power tongs are
allowed to pivot back and forth around the pipe
section 22, erroneus pulses could be output by
the divide-by-N circuit 206 to the computer 29.
The up/down counting ability of of the divide-by
N circuit 206 compensates for the back and forth
pivoting of the power tongs and prevents the
outputting of any erroneous pulses.
If we assume, for the purposes of illustration,
that the outside diameter of the pipe section 22 is
five times the diameter of the idler wheel 201,
then the encoder 204 will generate fifty thousand
pulses for each revolution of the pipe section. If
"N" is set at five hundred at the N input circuit
207, the divide-by-N circuit 206 will generate one
hundred pulses for each revolution of the pipe
section on a line 208 and each pulse will
represent one percent of one turn of the pipe
section. It can be seen that the turns counter
according to the present invention can be utilized
with a wide range of pipe section diameter simply
by matching the number "N" to the ratio between the idler wheel diameter and the pipe section outer diameter to maintain the signal on the line 208 at one hundred pulses per pipe section
revolution.Furthermore, the number "N" can also be selected to increase or decrease the resolution
of one percent per pulse. The turns counter according to the present invention has significantly higher resolution than the prior art turns counters which generate a signal each one tenth of a revolution.
The turns counter according to the present invention is especially useful in the makeup of premium threaded connections. In such a connection, the number of turns made between the reference torque position and the minimum torque position (see Fig. 2a) is very small,
sometimes less than one complete turn. Thus, a
finer resolution than one tenth of a turn is
required in order to make a good joint. In a
premium type shouldering connection, it is
desired to have a metal-to-metal seal between
the end surface of the pipe section and a shoulder surface in the pipe coupling. In the prior art
apparatus, it was assumed that such a seal had been made when a predetermined torque value had been reached.With the present invention, a number of turns or a fraction of a turn can be measured when simultaneously reaching a particular torque value to more accurately define when the seal has been made.
For example, assume that the pipe diameter to idler wheel diameter ratio is five and it is desired to make 0.7 turn. If the number "N" is set at 350, the divide-by-N counter will generate one hundred output pulses in 0.7 turn of the pipe section, each pulse representing one percent of the desired rotation.
In each of the above examples, the number "N"
can be found with a simple formula. If it is desired
to generate "P" pulses per revolution of the
member of the joint being rotated, and the joint
member outside diameter is "OD", the idler wheel
diameter is "WD", and the encoder generates "E"
pulses per revolution of the idler wheel, then the formula for "N" is:
N=(OD/WD) (E/P)
If it is desired to generate "P" pulses in a predetermined number of turns "T" of the joint
member, then the formula for "N" is:
N=T(OD/WD) (E/P)
There is shown in Fig. 4 an apparatus for threading pipe and a control system therefor. The pipe sections 22 and 24, the pipe coupling 23, the torque transducer 27, the tong remote unit 28 and the input/output devices 31 are similar to the like-numbered elements shown in Fig. 1.The turns counters 25 and 26 can be of the type shown in Fig. 1 or of the type shown in Fig. 3. A power tongs unit 21 includes tongs 220 for gripping the pipe section 22, a tong motor 221 for rotating the tongs 220, and a hydraulic pump and reservoir 222 for generating hydraulic fluid under pressure to drive the motor 221. the tongs 220, the motor 221 and the pump and reservoir 222 are well-known in the industry and are not shown in detail.
A throttle valve 223 is connected between the motor 221 and the pump and reservoir 222.
When the valve 223 is actuated, pressurized fluid flows from the pump and reservoir 222 through a supply line 224, through the valve 223 through a supply line 225, and to the motor 221. Fluid flows from the motor 221, through a return line Z26, through the valve 223, through a return line 227, and back to the pump and reservoir 222. When the valve 223 is actuated, a bypass port (not shown) is opened to connect the lines 224 and 227 and the pressure to the motor 221 is relieved.
In the prior art system shown in Fig. 1, the computer 29 can generate a dump signal through the tong remote unit 28 to the power tongs unit 21 to automatically shut down the power tongs upon reaching either a good joint or a bad joint. In the system shown in Fig. 4, the computer 29' can generate the dump signal to actuate the valve, but also can generate a control signal through the tong remote unit 28 to control the throttle valve 223 as will be described below.
Galling, the tearing or deforming of the threads on a pipe or coupling, can be substantially reduced or eliminated by limiting the relative speed of rotation between two members being threaded together. The system shown in Fig. 4 can be utilised to warn the operator to slow down the speed of the power tongs unit 21 or to automatically control the speed utilizing the throttle valve 223. The computer 29' is similar to the computer 29 of Fig. 1 and includes a clock which generates a clock signal at a
predetermined frequency. The computer 29' can be programmed, or a standard counting circuit can
be connected thereto, to accumulate clock pulses and generate an elasped time signal. The elapsed time for the maximum desired rate can be inputted to the computer 29' through the inputloutput devices 31 keyboard and stored.
Each time a turn signal pulse is received from the turns counter 25, the time elapsed from the last turn signal pulse can be compared with the stored time to determine if the maximum rotation rate has been exceeded.
There is shown in Fig. 5 a flow diagram of a program for the computer 29' whereby a warning is generated to the operator of the apparatus when a maximum rotation rate is exceeded. The program begins at a circle START 230 and enters a decision point TEST MODE 1 or 2 231.
The operator must determine what mode to
operate in for the particular pipe speed that must
be tested.Two modes are required to test a range
of rotation speeds from slow, with pulses every
one tenth of a turn, to fast, with as many as two
hundred pulses per revolution. In Mode 1, the frequency or pulse rate is measured for the faster
speeds. In Mode 2, the period of time between the pulses is measured for the slower speeds.
If Mode 2 is selected, typically utilizing a
switch on the computer 29', the program
branches from the decision point 231 at MODE 2
to a program instruction UPDATE CLOCK 248 which updates the elapsed time by adding the
time elapsed since the last time the clock was
updated. The program then enters a TURN
SIGNAL PULSE? decision point 232. If no turn
signal pulse has been generated, the main
program branches at NO to a circle MAIN 233
and returns to the main program until the next time
the program enters at the circle 230. Since the
rate at which the computer branches from the
main program to the program shown in Fig. 5
exceeds the maximum expected pulse rate for the slower speeds, the program will loop while waiting for a turn signal pulse.If a turn signal pulse has been generated, the program branches at YES to execute a program instruction SAVE
CLOCK ET 234 causing the computer to save the value of the elapsed time ET accumulated between turn signal counter pulses. Then the program executes a program instruction RESET
CLOCK=O 235 to reset the accumulated time ET to zero for accumulating a new elapsed time.
The program then enters a decision point TEST
ET 236 where the stored value of the elapsed time ET is tested for a low or a high value. If the time is lower than a predetermined value, the turn signal pulses are occurring too rapidly indicating that the speed of rotation is too high. The program branches at LOW to execute a program instruction SET FLASH 237 to generate a signal to indicate to the operator that he should slow down the speed of rotation. In response, the operator will slow down the speed of rotation and the light will be turned off. The program enters the circle 233 to return to the main program. If the time is higher than the predetermined value, the turn signal pulses are occurring more slowly
indicating that the speed is below the warning value.The program branches from the decision point 236 at HIGH to execute a program instruction RESET 238 to reset the flashing light.
The program then enters the circle 233 to return to the main program. The program instructions 237 and 238 can also be utilized to directly control the speed of the power tongs unit.
If Mode 1 is selected, the program branches from the decision point 231 at MODE 1 to execute a program instruction ADD NEW TURN
SIGNAL PULSES TO COUNTER 239 which adds the TURN SIGNAL PULSES which have occurred since the last loop through the program of Fig. 5 to a count total in a counter. Next, the program executes a program instruction UPDATE CLOCK 240 which updates the elapsed time by adding the time elapsed since the last time the clock was updated. The program then enters a decision point TEST CLOCK TIME 241 to compare the elapsed time with a predetermined value to determine if sufficient time has elapsed to test the numbers of turn signal pulses. If the elapsed time is too low, the program branches at NOT TIME to the circle 233 to return to the main program.
If the test period has elapsed, the program branches from the decision point 24 t at TIME to execute a program instruction RESET CLOCK=O 242 to reset the elapsed time to zero. Then the program executes a program instruction SAVE
TURN SIGNAL PULSE COUNT TOTAL 243 to save the count total in the counter. The program then enters a decision pointTESTTURN SIGNAL
PULSE COUNT TOTAL 244 to compare the count total with a predetermined value. If the count total
is High, the program branches at HIGH to execute
a program instruction SET FLASH 245 to indicate
that the maximum desired speed has been
exceeded. If the count total is too low, the
program branches at LOW to execute a program instruction RESET FLASH 246 to reset the flashing light The program instructions 245 and 246 can also be utilized to control the power tongs unit.The program executes a program instruction RESET TURN SIGNAL PULSE
COUNT=O 247 after either of the instructions 245 and 246 to reset the count total to zero. The program then exits to the main program at the circle 233.
All of the accumulated values in the program of
Fig. 5 can be initialized at the beginning of the
main program. In Mode 1, the count pulse rate is
relatively high. Therefore, the program counts the
number of pulses occurring in a predetermined elapsed time to determine the speed of rotation.
In Mode 2, the count pulse rate is relatively low.
Therefore, the program accumulates the elapsed time between count pulses to determine the speed of rotation.
There is shown in Fig. 6a, in block diagram form, a logic circuit substantially equivalent to the logic of the flow diagram of Mode 2 of Fig. 5. A number representing a minimum number of turn signal pulses between clock pulses is inputted on
a DATA IN line 250 to a memory 251. This number is loaded into a preset counter 252 on a line 253 at a preset input. The clock pulses are an input on a line 254 to an input 255-1 of an AND gate 255. The turn signal pulses from the counter are an input on a line 256 to a set input of the counter 252 and an input 257-1 of an AND gate 257.An output of the counter 252 is connected to an inverting input 257-2 of the AND gate 257 which has an output 257-3 connected to a SET
FLASH line 258. the output othe counter 252 is also connected to a RESET FLASH line 259 and to an inverting input 255-2 of the AND 255. The
AND 255 has an output 255-3 connected to a count input of the counter 252.
When a turn signal pulse occurs, the counter 252 is set to the preset number. The counter is responsive to the clock pulses to count down from the preset number. The counter generates a "0" output to enable the AND 255, and the AND 257. If the preset number is reached before the next turn signal pulse occurs, the counter generates a "1" on the line 259 to reset the flashing light and disable the ANDs 255 and 257.
The nest turn signal pulse again sets the counter to the preset number and the counter enables the
ANDs 255 and 257. If the next turn signal pulse occurs before the preset number of clock pulses has been counted down to zero, the AND 257 generates a "1" on the line 258 to set the flashing light to indicate that the maximum speed of rotation has been exceeded. The turn signal pulse also sets the counter 252 to restart the counting cycle.
There is shown in Fig. 6b, in block diagram form, a logic circuit substantially equivalent to the
logic of the flow diagram of Mode 1 of Fig. 5. A
number representing a maximum number of turn signal pulses perN (typically twenty) clock pulses
is inputted on a DATA IN line 260 to a memory 261. This number is loaded into a preset counter 262 on a line 263 at a preset input. The turn signal pulses are an input on a line 264 to an input 265-1 of an AND gate 265. The clock pulses are an input on a line 266 to a divide-bytwenty counter 267. An output of the counter 267 is connected to a set input of the counter 262 and an input of an AND gate 268. An output of the counter 262 is connected to an inverting input 268-2 of the AND 268 which has an output 268-3 connected to a RESET FLASH line 269.
The output of the counter 262 is also connected to a SET FLASH line 270 and to an inverting input 265-2 of the AND 265. The AND 265 has an output 265-3 connected to a count input of the counter 262.
After N (typically) twenty clock pulses occur, the counter 267 generates a "1" to set the counter 262 to the preset number. The counter 262 is responsive to the turn signal pulses to count down from the preset number. The counter 262 generates a "0" output to enable the ANDs 265 and 268. If the preset number is counted down to zero before N (20) more clock pulses occur, the counter 262 generates a "1" on the line 270 to set the flashing light and disable the
ANDs 265 and 268. When the counter 267 generates a "1", the counter 262 is reset and the
ANDs 265 and 268 are enabled to restart the counting cycle. If the counter 267 generates a "1" before the preset number of turn signal pulses is counted, the AND 268 generates a "1" on the line 269 to reset the flashing light and the counter 262 is reset.
The SET FLASH instructions 237 and 245 of
Fig. 5 or the SET FLASH signals on the lines 258 and 270 of Figs 6a and 6b respectively can be utilized to control the valve 223 of Fig, 4. If the valve 223 is actuated when the set flash in indicated, the valve 223 will be modulated as the speed of rotation is alternately increased and decreased. The control can be achieved by utilizing conventional pulse width modulated circuitry to match the response time of the valve and the motor.
In summary, one aspect of the present invention concerns an increased resolution turns counter for an apparatus for counting turns when making threaded joints from a pair of threaded members. The apparatus includes means for rotating one of the members with respect to the other member, means for generating a signal representing actual turns made by the one member. The actual turns signal generating means comprises means responsive to the rotation of the one member for generating a first plurality of pulses at a first frequency proportional to the speed of rotation of the one member, and means responsive to the first plurality of pulses for generating a second plurality of pulses at a second frequency lower than the first frequency, each pulse of the second plurality representing a predetermined increment of rotation of the one member. The means responsive to the rotation of the one member includes an idler wheel, means for biasing the idler wheel against an outside surface of the one member, an encoder means, and a drive shaft coupled between the idler wheel and the encoder means. The means for generating the second plurality of pulses includes means for dividing the first plurality of pulses by a predetermined number N to generate the second plurality of pulses. The means for dividing includes a divide-by-N.counter and the means for generating the second plurality of pulses also includes means for generating a preset signal representing the value of "N" to the counter. The apparatus also includes means for effecting a signal to permit or prohibit the divide-by-N circuit from outputting a pulse to the computer when the wheel is rotating in either forward or reverse directions.
Another aspect of the present invention concerns a speed control for an apparatus for making threaded joints from a pair of threaded members. The apparatus includes means for rotating one of the members with respect to the other member, means responsive to the rotation for generating a pulsed signal representing actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, means for generating a signal representing the actual torque applied to the one member by the means for rotating, and means responsive to the actual turns signal for generating an indication to an operator to slow down the means for rotating one of the members.
Utilised in such an apparatus is means for controlling the speed of rotation of the one member comprising means responsive to the actual turns signal for generating a signal representing the actual turns signal pulse rate, means for generating a signal representing maximum rate for a desired maximum speed of rotation of the one member, and means responsive to the actual turns rate signal and the maximum rate signal for generating an output signal when the actual turns rate is greater than the maximum rate and wherein the means for generating an indication is responsive to the output signal for generating an indication to the operator to slow down the speed of the means for rotating. The actual turns rate signal can be generated by accumulating a count total representing the elapsed time between the actual turns pulses or the number of actual turns pulses occurring during a predetermined time interval.
The means for controlling also includes means responsive to the output signal for generating a speed control signal and the means for rotating is responsive to the speed control signal for determining the speed or rotation of the one member.
Claims (27)
1. An apparatus for counting the number of turns made by one threaded member being rotated during the making of a threaded joint from a pair of threaded members comprising means responsive to the rotation of the one member for generating a first plurality of pulses at a first frequency proportional to the speed of rotation of the one member and means responsive to the first plurality of pulses for generating an actual turns signal as a second plurality of pulses at a second frequency lower than the first frequency, each pulse of the second plurality representing a predetermined increment of rotation of the one member.
2. Apparatus according to claim 1 wherein the means for generating the first plurality of pulses includes an encoder means for generating the first plurality of pulses upon rotation thereof and means driven by the one member and coupled in driving relationship to the encoder means.
3. Apparatus according to claim 2 wherein the
means driven by the one member includes an idler wheel engaging the outside surface of the one member and a drive shaft coupled between the idler wheel and the encoder means.
4. Apparatus according to claim 3 including
means for biasing the idler wheel into engagement with the one member.
5. Apparatus according to claim 2 wherein the encoder means includes an optical encoder coupled to the means driven by the one member for generating the first plurality of pulses.
6. Apparatus according to claim 1 wherein the
means for generating the second plurality of
pulses includes means for dividing the first
plurality of pulses by a predetermined number N to generate the second plurality of pulses.
7. Apparatus according to claim 6 wherein the
means for dividing includes a divide-by-N counter
responsive to the first plurality of pulses for generating the second plurality of pulses.
8. Apparatus according to claim 7 including means for generating a preset signal representing the value of N and wherein the counter is responsive to the preset signal for dividing the first plurality of pulses by the value of N.
9. Apparatus according to claim 8 wherein the
means for generating the preset signal includes switches for selecting the value of N.
10. Apparatus according to claim 9 in which the switches are thumbwheel switches.
11. Apparatus according to claim 6 wherein the means for generating the first plurality of
pulses includes an idler wheel engaging the
outside surface of the one member, an encoder
means for generating the first plurality of pulses
upon rotation thereof, and means coupling the
idler wheel in driving relationship to the encoder
means, and wherein the value of the
predetermined number N is equal to a first value
representing the outside diameter of the one
member divided by the diameter of the idler
wheel multiplied by a second value representing
the number of pulses generated by the encoder
means per revolution of the idler wheel divided by
a number of pulses desired per revolution of the
one member.
12. Apparatus according to claim 11 wherein
the means for generating the first plurality of
pulses includes an idler wheel engaging the
outside surface of the one member an encoder means for generating said first plurality of pulses upon rotation thereof, and means for coupling the idler wheel in driving relationship to the encoder means, and wherein the value of the predetermined number N is equal to a first value representing the outside diameter of the one member divided by the diameter of the idler wheel multiplied by a second value representing the number of pulses generated by the encoder means per revolution of the idler wheel when divided by a desired number of pulses in a predetermined number of turns multiplied by a third value representing said predetermined number of turns.
1 3. Apparatus according to claim 7 further comprising a direction sensor and means for effecting a signal to selectively permit or prohibit the divide-by-N counter from outputting a pulse when the sensor is receptive to each of opposing directions.
14. Apparatus for making threaded joints from a pair of threaded members including means for rotating one of the members with respect to the other member and apparatus according to any preceding claim for generating a signal representing the actual turns made by the one member.
1 5. A method of generating a signal representing predetermined increments of rotation of one threaded member being rotated during the making of a threaded joint from a pair of threaded members comprising the steps of:
a. sensing the direction of rotation of the one member and generating a first plurality of pulses at a first frequency proportional to the speed of rotation of the one member; and
b. dividing said first plurality of pulses by a predetermined number N to generate a second plurality of pulses at a second frequency lower than said first frequency, each pulse of said second plurality representing a predetermined increment of forward or reverse rotation of the one member.
1 6. Apparatus for making threaded joints from a pair of threaded members including means for rotating one member with respect to the other member, means responsive to the rotation of the one member for generating a pulsed signal representing the actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulses are being generated, means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member, and means responsive to said actual turns rate signal and the maximum rate for generating an output signal when the actual means rate is greater than the said maximum rate, and means responsive to the output signal either for controlling automatically the speed of rotation of the one member with respect to the other or for giving an indication to the operator to control the speed of rotation of the one member with respect to the other.
1 7. An apparatus for making threaded joints from a pair of threaded members including means for rotating one of the members with respect to the other member, means responsive to the rotation of the one member for generating a pulsed signal representing actual turns made by the one member at a frequency proportional to the speed of rotation of the one member means responsive to the actual turns signal for generating an indication to an operator to slow down the means for rotating and means for controlling the speed of rotation of the one member comprising means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulses are being generated, means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member, and means responsive to the actual turns rate signal and the maximum rate signal for generating an output signal when the actual turns rate is greater than the maximum rate and wherein the means for generating an indication is responsive to the output signal for generating an indication to the operator to slow down the speed of the means for rotating.
1 8. Apparatus according to claim 1 7 wherein the means for generating a signal representing the actual turns rate includes a preset counter having a set input connected to the means for generating a pulsed actual turns signal, a count input connected to a clock means for generating a pulse train at a predetermined frequency, and a preset input connected to the means for storing a preset number representing the maximum pulse rate and in which the preset counter is responsive to each of the actual turns signal pulses for resetting the preset number into the present counter, and is responsive to the clock pulses for counting down from the preset number and wherein the means for generating an output signal is responsive to the generation of one of the actual turns signal pulses before the preset number is counted down to zero for generating the output signal.
1 9. Apparatus according to claim 18 wherein the means for generating an indication to the operator is responsive to the number being counted down to zero before the next turn signal pulse occurs for discontinuing the generation of said indication to the operator.
20. Apparatus according to claim 1 7 wherein the means for rotating is responsive to a speed control signal for determining the speed of rotation of the one member and the means for controlling the speed of rotation includes means responsive to the output signal for generating the speed control signal.
21. Apparatus according to claim 1 7 wherein the means for generating a signal representing the actual turns rate includes a preset counter having a set input connected to a clock means for generating a pulse train at a predetermined frequency, a count input connected to the means for generating a pulsed actual turns signal, and a preset input connected to the means for storing a preset number representing the maximum pulse rate and in which the preset counter is responsive to every "N" clock pulse for resetting the preset number into the preset counter and is responsive to the actual turns signal pulses for counting down from the preset number, and wherein the means for generating an output signal is responsive to the counting down of said preset number to zero before the generation of one of said Nth clock pulses for generating said output signal.
22. Apparatus according to claim 21 wherein the means for generating an indication to the operator is responsive to the generation of one of the Nth clock pulses before the preset number is counted down to zero for discontinuing the generation of the indication to the operator.
23. Apparatus for making threaded joints from a pair of threaded members including means responsive to a speed control signal for rotating one of the members with respect to the other member at a speed determined by the speed control signal, and means responsive to the rotation of the one member for generating a pulsed signal representing the actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, and means for controlling the speed of rotation of the one member comprising means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulses are being generated, means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member, and means responsive to said actual turns rate signal and the maximum rate for generating the speed control signal when the actual turns rate is greater than the maximum rate signal.
24. Apparatus according to claim 23 wherein the means for generating a signal representing the actual turns rate includes a preset counter responsive to the actual turns signal pulses and the maximum pulse rate signal for setting a preset number into the preset counter and responsive to the clock pulses for counting down from said preset number, and wherein the means for generating said speed control signal is responsive to the generation of one of the actual turns signal pulses before preset number is counted down to zero for generating the speed control signal.
25. Apparatus according to claim 23 wherein the means for generating a signal representing the actual turns rate includes a preset counter responsive to said Nth clock pulse and the maximum pulse rate signal for setting a preset number into the preset counter, and wherein the means for generating said speed control signal is responsive to the counting down of the preset number to zero before the generation of one of the Nth clock pulses for generating the output signal.
26. Apparatus according to any of Claims 16 to 25 in which the means responsive to the rotation of the one member for generating a pulsed signal is apparatus according to any of claims 1 to 12.
27. Apparatus for generating an output signal for use in controlling the speed of rotation of one threaded member with respect to another while making a threaded joint from the members and while generating a pulsed signal representing the actual turns made by the one member at a frequency proportional to the speed of rotation of the one member, the apparatus comprising means responsive to the actual turns signal for generating a signal representing a rate at which the actual turns signal pulses are both generated, means for storing a preset number representing a maximum pulse rate for a desired maximum speed of rotation of the one member, and means responsive to said actual turns rate signal and the maximum rate for generating the output signal when the actual turns rate is greater than the said maximum rate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/253,118 US4446745A (en) | 1981-04-10 | 1981-04-10 | Apparatus for counting turns when making threaded joints including an increased resolution turns counter |
US06/253,127 US4402052A (en) | 1981-04-10 | 1981-04-10 | Apparatus for making threaded joints incorporating a make-up speed controller |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2099620A true GB2099620A (en) | 1982-12-08 |
GB2099620B GB2099620B (en) | 1985-09-25 |
Family
ID=26942949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8210308A Expired GB2099620B (en) | 1981-04-10 | 1982-04-07 | Apparatus for counting turns when making threaded joints including an increased resolution turns counter |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA1213653A (en) |
GB (1) | GB2099620B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1510299A2 (en) * | 2003-08-26 | 2005-03-02 | Matsushita Electric Works, Ltd. | Electric tool with a plurality of operation modes |
EP1813768A1 (en) * | 2006-01-30 | 2007-08-01 | Weatherford/Lamb, Inc. | System and method for deflection compensation in power drive system for connection of tubulars |
US7594540B2 (en) | 2002-11-27 | 2009-09-29 | Weatherford/Lamb, Inc. | Methods and apparatus for applying torque and rotation to connections |
US8297347B2 (en) | 2008-04-25 | 2012-10-30 | Weatherford/Lamb, Inc. | Method of controlling torque applied to a tubular connection |
US8517090B2 (en) | 2001-05-17 | 2013-08-27 | Weatherford/Lamb, Inc. | Apparatus and methods for tubular makeup interlock |
CN109108608A (en) * | 2018-10-30 | 2019-01-01 | 河北亚大汽车塑料制品有限公司 | A kind of heating urea pipe fitting automatic assembling machine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US6536520B1 (en) | 2000-04-17 | 2003-03-25 | Weatherford/Lamb, Inc. | Top drive casing system |
CA2586317C (en) | 2006-04-27 | 2012-04-03 | Weatherford/Lamb, Inc. | Torque sub for use with top drive |
-
1982
- 1982-03-29 CA CA000399640A patent/CA1213653A/en not_active Expired
- 1982-04-07 GB GB8210308A patent/GB2099620B/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US7568522B2 (en) | 2001-05-17 | 2009-08-04 | Weatherford/Lamb, Inc. | System and method for deflection compensation in power drive system for connection of tubulars |
US8167038B2 (en) | 2001-05-17 | 2012-05-01 | Weatherford/Lamb, Inc. | System and method for deflection compensation in power drive system for connection of tubulars |
US8517090B2 (en) | 2001-05-17 | 2013-08-27 | Weatherford/Lamb, Inc. | Apparatus and methods for tubular makeup interlock |
US7594540B2 (en) | 2002-11-27 | 2009-09-29 | Weatherford/Lamb, Inc. | Methods and apparatus for applying torque and rotation to connections |
EP1510299A2 (en) * | 2003-08-26 | 2005-03-02 | Matsushita Electric Works, Ltd. | Electric tool with a plurality of operation modes |
EP1510299A3 (en) * | 2003-08-26 | 2008-12-10 | Matsushita Electric Works, Ltd. | Electric tool with a plurality of operation modes |
EP1813768A1 (en) * | 2006-01-30 | 2007-08-01 | Weatherford/Lamb, Inc. | System and method for deflection compensation in power drive system for connection of tubulars |
NO331945B1 (en) * | 2006-01-30 | 2012-05-07 | Weatherford Lamb | System and method for bending compensation in a motor operating system for connecting pipes |
US8297347B2 (en) | 2008-04-25 | 2012-10-30 | Weatherford/Lamb, Inc. | Method of controlling torque applied to a tubular connection |
CN109108608A (en) * | 2018-10-30 | 2019-01-01 | 河北亚大汽车塑料制品有限公司 | A kind of heating urea pipe fitting automatic assembling machine |
CN109108608B (en) * | 2018-10-30 | 2023-10-31 | 河北亚大汽车塑料制品有限公司 | Automatic assembly machine for heating urea pipe joint |
Also Published As
Publication number | Publication date |
---|---|
GB2099620B (en) | 1985-09-25 |
CA1213653A (en) | 1986-11-04 |
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PCNP | Patent ceased through non-payment of renewal fee |