WO2013126064A1 - Well drilling systems and methods with pump drawing fluid from annulus - Google Patents
Well drilling systems and methods with pump drawing fluid from annulus Download PDFInfo
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- WO2013126064A1 WO2013126064A1 PCT/US2012/026419 US2012026419W WO2013126064A1 WO 2013126064 A1 WO2013126064 A1 WO 2013126064A1 US 2012026419 W US2012026419 W US 2012026419W WO 2013126064 A1 WO2013126064 A1 WO 2013126064A1
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- suction pump
- pressure
- fluid
- wellbore
- annulus
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
Definitions
- This disclosure relates generally to equipment utilized and operations performed in conjunction with well drilling and, in one example described below, more particularly provides well drilling systems and methods with a pump drawing fluid from an annulus.
- Well pressure control systems generally should prevent undesired loss of drilling fluid to a formation penetrated by a wellbore (although in some drilling operations a certain amount of fluid loss can be desirable), and generally should prevent undesired influx of formation fluid from the
- FIG. 1 is a representative view of a well drilling system which can embody principles of this disclosure.
- FIG. 2 is a representative flowchart representing a method which can embody principles of this disclosure.
- FIG. 3 is a representative flowchart of a parameter signature generation process which may be used in the method of FIG. 2.
- FIG. 4 is a representative flowchart of an event signature generation and event identification process which may be used in the method of FIG. 2.
- FIG. 5 is a representative listing of events and corresponding event signatures which may be used in the method of FIG. 2.
- FIG. 6 is a representative elevational view of a vacuum pump which may be used in the well drilling system.
- FIG. 7 is a representative elevational view of another configuration of the system incorporating the vacuum pump.
- FIG. 1 Representatively illustrated in FIG. 1 is a well drilling system 10 and associated method which can
- Drilling fluid 18 (commonly known as "mud,” although brine or other types of fluids may be used) is circulated downward through the drill string 16, out the drill bit 14 and upward through an annulus 20 formed between the drill string and the wellbore 12, in order to cool the drill bit, lubricate the drill string, remove cuttings and provide a measure of bottom hole pressure control.
- a non-return valve 21 (typically a flapper-type check valve) prevents flow of the drilling fluid 18 upward through the drill string 16 (e.g., when connections are being made in the drill string) .
- the well pressure is accurately controlled to prevent excessive loss of fluid into an earth formation 64 surrounding the wellbore 12, undesired fracturing of the formation, undesired influx of formation fluids into the wellbore, etc.
- Nitrogen or another gas, or another lighter weight fluid may be added to the drilling fluid 18 for pressure control. This technique is useful, for example, in
- additional control over the well pressure is obtained by closing off the annulus 20 (e.g., isolating it from communication with the atmosphere and enabling a pressure differential to be maintained between the annulus and the atmosphere at or near the surface), for example, using a rotating control device 22 (RCD) .
- the RCD 22 seals about the drill string 16 above a wellhead 24, and can do so while the drill string rotates therein.
- the drill string 16 may be isolated from the atmosphere using a sealing device, without the drill string rotating within the sealing device (e.g., when drilling with a downhole drilling motor, when drilling with coiled tubing, etc . ) .
- the drill string 16 can extend upwardly through the RCD 22 for
- the drilling fluid 18 exits the wellhead 24 via a wing valve 28 in communication with the annulus 20 below the RCD 22.
- the fluid 18 then flows through drilling fluid return line 30 to a choke manifold 32, which preferably includes redundant chokes 34 (only one of which may be used at a time).
- Backpressure can be applied to the annulus 20 by variably restricting flow of the fluid 18 through the operative choke(s) 34.
- pressure in the wellbore 12 can be conveniently regulated by varying the backpressure applied to the annulus 20.
- a hydraulics model can be used to determine a pressure in the annulus 20 at or near the earth's surface which will result in a desired wellbore pressure, so that an operator (or an automated control system) can readily determine how to regulate the pressure applied to the annulus at or near the surface (which can be conveniently measured) in order to obtain the desired wellbore pressure.
- Pressure in the annulus 20 can be measured at or near the surface via a variety of pressure sensors 36 , 38 , 40 , each of which is in communication with the annulus.
- Pressure sensor 36 senses pressure below the RCD 22 , but above a blowout preventer (BOP) stack 42 .
- Pressure sensor 38 senses pressure in the wellhead 24 below the BOP stack 42 .
- Pressure sensor 40 senses pressure in the drilling fluid return line 30 upstream of the choke manifold 32 .
- Another pressure sensor 44 senses pressure in the drilling fluid injection (standpipe) line 26 .
- Yet another pressure sensor 46 senses pressure downstream of the choke manifold 32 , but upstream of a separator 48 , shaker 50 and mud pit 52 .
- Additional sensors include temperature sensors 54 , 56 , Coriolis flowmeter 58 , and flowmeters 62 , 67 .
- the flowmeter 62 measures a flow rate of the fluid 18 being injected into the drill string 16 by a rig mud pump 68 .
- the flow meter 67 measures a flow rate of the fluid 18 upstream of a suction pump 66 used to draw the fluid from the annulus 20 .
- the drill string 16 may include its own sensors 60 , for example, to directly measure well pressure.
- sensors 60 may be of the type known to those skilled in the art as pressure while drilling (PWD), measurement while drilling (MWD) and/or logging while drilling (LWD) systems.
- PWD pressure while drilling
- MWD measurement while drilling
- LWD logging while drilling
- These drill string sensor systems generally provide at least pressure measurement, and may also provide temperature measurement, detection of drill string characteristics (such as vibration, torque, rpm, weight on bit, stick-slip, etc.), formation characteristics (such as resistivity, density, etc.), fluid characteristics and/or other measurements.
- Various forms of telemetry may be used to transmit the downhole sensor 60 measurements to the surface.
- the downhole sensors 60 may be used in combination with, or instead of, the surface sensors to, for example,
- Pressure and level sensors could be used with the separator 48, level sensors could be used to indicate a volume of drilling fluid in the mud pit 52, etc.
- the output of the rig mud pump 68 could be determined by counting pump strokes, instead of by using flowmeter 62 or any other flowmeters.
- the system 10 it should be understood that it is not necessary for the system 10 to include all of the sensors depicted in FIG. 1 and described herein, and the system could instead include additional sensors, different combinations and/or types of sensors, etc .
- the separator 48 could be a 3 or 4 phase separator, or a mud gas separator (sometimes referred to as a "poor boy degasser" ) .
- the separator 48 is not necessarily used in the system 10.
- the drilling fluid 18 is pumped through the standpipe 26 and into the interior of the drill string 16 by the rig mud pump 68.
- the pump 68 receives the fluid 18 from the mud pit 52 and flows it via a standpipe manifold (represented by valve 70 in FIG. 1) to the standpipe 26, the fluid then circulates downward through the drill string 16, upward through the annulus 20, through the pump 66, through the drilling fluid return line 30, through the choke manifold 32, and then via the separator 48 and shaker 50 to the mud pit 52 for conditioning and recirculation.
- the choke 34 cannot be used to control backpressure applied to the annulus 20 for control of the well pressure, unless the fluid 18 is flowing through the choke.
- a connection is made in the drill string 16 (e.g., to add another length of drill pipe to the drill string as the wellbore 12 is drilled deeper), and the lack of
- pressure in the well can be conveniently regulated by use of the suction pump 66 instead of, or in combination with, use of the choke 34 for such purpose.
- the pump 66 can draw fluid down in the annulus 20 to reduce the hydrostatic pressure of the fluid in the wellbore, and/or the pump can directly reduce the pressure in the annulus if the annulus is sealed from atmosphere (e.g., with the RCD 22).
- the pump 66 can be used to regulate pressure in the annulus 20, so that pressure in the wellbore 12 is selectively over, under, or at balance with the pore pressure of the formation 64 penetrated by the wellbore.
- pressure in the wellbore 12 at other locations can similarly be regulated by use of the pump 66.
- the fluid 18 density is chosen so that pressure in the wellbore 12 will be somewhat statically overbalanced with respect to pressure in the formation 64 (e.g., the hydrostatic pressure due to the weight of the vertical column of fluid is greater than formation pressure).
- the suction pump 66 is used to decrease the pressure in the wellbore 12 as desired, so that pressure in the wellbore is at a desired level (e.g., at balance, slightly overbalanced, somewhat underbalanced, etc.) while the fluid 18 is circulating through the drill string 16 and wellbore, while the fluid is not circulating, while the wellbore is being drilled, while connections are being made in the drill string, etc.
- the density of the fluid 18 acts as a barrier to prevent inadvertent escape of well fluids from the well (due to, for example, influx of formation fluids into the wellbore 12 from the formation 64, etc.). Coupled with the BOP stack 42, this provides multiple barriers to inadvertent escape of well fluids .
- system 10 could include a backpressure pump (not shown) for applying
- backpressure pump could be used, for example, to ensure that fluid 18 continues to flow through the choke manifold 32 during events such as making connections in the drill string 16.
- additional sensors may be used to, for example, monitor the pressure and flow rate output of the backpressure pump.
- connections may not be made in the drill string 16 during drilling, for example, if the drill string comprises a continuous coiled tubing.
- the drill string 16 could be provided with conductors and/or other lines (e.g., in a sidewall or interior of the drill string) for transmitting data, commands, pressure, etc., between downhole and the surface (e.g., for communication with the sensors 60 ) .
- a well drilling method 90 which may be used with the system 10 of FIG. 1 is representatively illustrated in flowchart form. However, it should be clearly understood that the method 90 could be used in conjunction with other systems in keeping with the scope of this disclosure.
- the method 90 includes an event detection process which can be used to alert an operator if an event occurs, such as, by triggering an alarm or displaying a warning if the event is an undesired event (e.g., unacceptable fluid loss to the formation 64, unacceptable fluid influx from the formation into the wellbore 12, etc.), or by displaying information about the event if it is a normal, expected or desired event, etc.
- an undesired event e.g., unacceptable fluid loss to the formation 64, unacceptable fluid influx from the formation into the wellbore 12, etc.
- Well drilling methods incorporating event detection are described in International Application No. PCT/US09/52227, filed 30 July 2009.
- An event can be a precursor to another event happening, in which case detection of the first event can be used as an indication that the second event is about to happen or is in process of occurring.
- a series of events can also provide an indication that another event is about to happen.
- one or more prior events can be used as a source of data for determining if another event will occur.
- events and types of events can be detected in the method 90. These events can include, but are not limited to, a kick (influx), partial fluid 18 loss, total fluid loss, standpipe bleed down, plugged choke 34, washed out choke, poor hole cleaning (wellbore 12 packed off about drill string 16), downhole crossflow, wellbore
- Drilling properties e.g., pressure temperature, flow rate, etc.
- sensors are sensed by sensors, and output from the sensors is used to supply data indicative of the drilling properties.
- This drilling property data is used to determine drilling parameters of interest.
- Data can also be in the form of information relating to offset wells (e.g., other wells drilled nearby or in similar lithologies, conditions, etc.). Previous experience of drillers can also serve as a source for the data. Data can also be entered by an operator prior to or during the drilling operation.
- a drilling parameter can comprise data related to a single drilling property, or a parameter can comprise a ratio, product, difference, sum or other function of data related to multiple drilling properties. For example, it is useful in drilling operations to monitor the difference between the flow rate of drilling fluid 18 injected into the well (e.g., via the standpipe line 26 as sensed by flowmeter 62) and the flow rate of drilling fluid returned from the well (e.g., via the drilling fluid return line 30 as sensed by the flowmeter 67).
- a parameter of interest which can be used to define a part or segment of a signature can be this difference in drilling properties (e.g., flow rate in minus flow rate out).
- the drilling properties are sensed over time, either continuously or intermittently.
- data related to the drilling properties is available over time, and the behavior of each drilling parameter can be evaluated in real time.
- interest in the method 90 is how the drilling parameters change over time, that is, whether each parameter is
- parameter behaviors are given appropriate values, and the values are combined to generate parameter signatures indicative of what is occurring in real time during the drilling operation. For example, one segment of a parameter signature could indicate that standpipe pressure (e.g., as measured by sensor 44) is increasing, and another segment of the parameter signature could indicate that pressure
- upstream of the choke manifold (e.g., as measured by sensor 40) is decreasing.
- a parameter signature can include many (perhaps 20 or more) of these segments. Thus, a parameter signature can provide a "snapshot" of what is happening in real time during the drilling operation.
- an event signature is representative of what the drilling parameter behaviors will be when the corresponding event does happen.
- Each event signature is preferably distinctive, because each event is indicated by a distinctive combination of parameter behaviors.
- an event can be a precursor to another event.
- the event signature for the first event can be a distinctive combination of parameter behaviors which indicate that the second event is about to (or at least is eventually going to) happen.
- the corresponding parameter behavior can be whether or not the precursor event (s) have happened.
- Event signatures can be generated prior to commencing a drilling operation, and can be based on experience gained from drilling similar wells under similar conditions, etc.
- Event signatures can also be refined as a drilling operation progresses and more experience is gained on the well being drilled.
- sensors are used to sense drilling properties during a drilling operation, data relating to the sensed properties are used to determine drilling parameters of interest, values indicative of the behaviors of these parameters are combined to form parameter signatures, and the parameter signatures are compared to pre-defined event signatures to detect whether any of the corresponding events is occurring, or is substantially likely to occur.
- the data in this example can be received from a central database, such as an INSITETM database marketed by Halliburton Energy Services, Inc. of Houston, Texas USA, although other databases may be used if desired.
- INSITETM database marketed by Halliburton Energy Services, Inc. of Houston, Texas USA, although other databases may be used if desired.
- the data typically is in the form of measurements of drilling properties as sensed by various sensors during a drilling operation.
- the sensors 36 , 38 , 40 , 44 , 46 , 54 , 56 , 58 , 60 , 62 , 67 (or another combination of sensors) will produce indications of various properties
- Calibration, conversion and/or other operations may be performed for the data prior to the data being received from the database.
- the data may also be entered manually by an operator.
- data can be received directly from one or more sensors, or from another data acquisition system, whether or not the data originates from sensor measurements, and without first being stored in a separate database.
- the data can be derived from an offset well, previous experience, etc. Any source for the data may be used, in keeping with the
- step 94 various parameter values are calculated for later use in the method 90 .
- step 96 the parameter values are validated and smoothing techniques may be used to ensure that meaningful parameter values are utilized in the later steps of the method 90. For example, a parameter value may be excluded if it represents an unreasonably high or low value for that parameter, and the smoothing techniques may be used to prevent unacceptably large parameter value transitions from distorting later analysis.
- a parameter value can correspond to whether or not another event has occurred, as discussed above.
- step 98 the parameter signature segments are determined. This step can include calculating values
- a value of 1 may be assigned to the corresponding parameter signature segment; if a parameter has a decreasing trend, a value of 2 may be assigned to the segment; if the parameter is unchanged, a value of 0 may be assigned to the segment, etc.
- Comparisons between parameters may also be made to determine a particular signature segment. For example, if one parameter is greater than another parameter, a value of 1 may be assigned to the signature segment, if the first parameter is less than the second parameter, a value of 2 may be assigned, if the parameters are substantially equal, a value of 0 may be assigned, etc.
- step 100 the parameter signature segments are combined to make up the parameter signatures.
- Each parameter signature is a combination of parameter signature segments and represents what is happening in real time in the
- step 102 the parameter signatures are compared to the previously defined event signatures to see if there is a match. Since data is continuously (or at least
- corresponding parameter signatures can also be generated in the method 90 in real time for
- Step 104 represents defining of the event signatures which, as described above, can be performed prior to and/or during the drilling operation.
- Example event signatures are provided in FIG. 5, and are discussed in further detail below.
- an event is indicated if there is a match between an event signature and a parameter signature.
- An indication can be provided to an operator, for example, by displaying on a computer screen information relating to the event, displaying an alert, sounding an alarm, etc.
- Indications can also take the form of recording the
- a control system can also, or alternatively, respond to an indication of an event, as described more fully below.
- a probability of an event occurring is indicated if there is a partial match between an event signature and a parameter signature. For example, if an event signature comprises a combination of 30 parameter behaviors, and a parameter signature is generated in which
- Another useful indication would be of the probability of the event occurring in the future. For example if, as in the example discussed above, a substantial majority of the parameter behaviors match between the parameter signature and the event signature, and the unmatched parameter
- FIG. 3 a flowchart of another example of the process of generating the parameter signatures in the method 90 is representatively illustrated.
- the process begins with receiving the data as in step 92 described above. Parameter value calculations are then performed as in step 94 described above.
- preprocessing operations are performed for the parameter values.
- maximum and minimum limits may be used for particular parameters, in order to exclude erroneously high or low values of the parameters.
- step 112 the preprocessed parameter values are stored in a data buffer.
- the data buffer is used to queue up the parameter values for subsequent processing.
- step 114 conditioning calculations are performed for the parameter values. For example, smoothing may be used (such as, moving window average, Savitzky-Golay smoothing, etc.) as discussed above in relation to step 96.
- step 116 the conditioned parameter values are stored in a data buffer.
- step 118 statistical calculations are performed for the parameter values. For example, trend analysis (such as, straight line fit, determination of trend direction over time, first and second order derivatives, etc.) may be used to characterize the behavior of a parameter. Values assigned to the parameter behaviors can become segments of the resulting parameter signatures, as discussed above for step 98 .
- trend analysis such as, straight line fit, determination of trend direction over time, first and second order derivatives, etc.
- step 120 the parameter signature segments are output to the database for storage, subsequent analysis, etc.
- the parameter signature segments become part of the INSITETM database for the drilling
- step 100 as discussed above, the parameter
- signature segments are combined to form the parameter signatures .
- an event signature database is configured.
- the database can be configured to include any number of event signatures to enable any number of corresponding events to be identified during a drilling operation.
- the event signature database can be separately configured for different types of drilling operations, such as underbalanced drilling, overbalanced drilling, at balance drilling, managed pressure drilling, drilling in particular lithologies, etc.
- step 124 a desired set of event signatures are loaded into the event signature database.
- any number, type and/or combination of event are loaded into the event signature database.
- signatures may be used in the method 90 .
- step 126 the event signature database is queried to see if there are any matches to the parameter signatures generated in step 100 . As discussed above, partial matches may optionally be identified, as well.
- step 128 events are identified which correspond to event signatures that match (or at least partially match) any parameter signatures.
- the output in step 130 can take various different forms, which may depend upon the
- An alarm, alert, warning, display of information, etc. may be provided as discussed above for step 106 .
- occurrence of the event should be recorded, and in this example preferably is recorded, as part of the INSITETM database for the drilling operation.
- event signatures are representatively tabulated, along with parameter behaviors which correspond to the segments of the signatures.
- parameter behaviors which correspond to the segments of the signatures.
- many more event signatures may be provided, and more or less parameter behaviors may be used for determining the signature segments.
- each event signature is distinctive.
- a kick (influx) event is indicated by a particular combination of parameter behaviors
- a fluid loss event is indicated by another particular combination of parameter behaviors .
- an indication can be provided that the corresponding event is occurring. If a parameter signature is generated which matches an event signature to a predetermined level, or if the parameter signature's segments are trending toward matching, then an indication may be provided that the corresponding event is substantially likely to occur. This can happen even without any human intervention, resulting in a more automated, precise and safe drilling operation.
- the event indications provided by the method 90 can also be used to control the drilling operation. For example, if an undesired kick event is indicated, the suction pump 66 and/or the operative choke(s) 34 can be adjusted in response to increase pressure in the annulus 20. If an undesired loss of fluid 18 is detected, the suction pump 66 and/or choke(s) 34 can be adjusted to decrease pressure in the annulus 20.
- control over the drilling operation can be implemented based on detection of the corresponding events using the method 90 automatically and without human intervention, if desired.
- a control system such as that described in International
- PCT/US08/87686 may be used for implementing the control over the drilling operation.
- human intervention could be used, for example, to determine whether the control over the drilling operation should be implemented in response to detection of events in the method 90. Thus, if an event is detected (or if the event is indicated as being likely to happen), a human's authorization may be required before the drilling operation is automatically controlled in response.
- a controller 84 (such as a programmable logic controller or another type of controller capable of controlling operation of drilling equipment) is connected to a control system 86 (such as, the control system described in International Application No.
- controller 84 is also connected to flow control devices (such as chokes 34, etc.) for regulating flow injected into the drill string 16, flow through the drilling fluid return line 30, etc.
- flow control devices such as chokes 34, etc.
- the control system 86 can include various elements, such as one or more computing devices/processors , a
- hydraulics model a wellbore model, a database, software in various formats, memory, machine-readable code, etc.
- a wellbore model a database
- software in various formats, memory, machine-readable code, etc.
- the control system 86 is operatively connected to the sensors 36, 38, 40, 44, 46, 54, 56, 58, 60, 62, 67, which sense respective drilling properties during the drilling operation. As discussed above, offset well data, previous operator experience, other operator input, etc., may also be input to the control system 86.
- the control system 86 can include software, programmable and preprogrammed memory, machine-readable code, etc., for carrying out the steps of the method 90 described above.
- the control system 86 may be located at the wellsite, in which case the sensors 36, 38, 40, 44, 46, 54, 56, 58, 60, 62, 67 could be connected to the control system by wires or wirelessly. Alternatively, the control system 86 could be positioned at a remote location, in which case the control system could receive data via satellite transmission, the Internet, wirelessly, or by any other appropriate means.
- the controller 84 can also be connected to the control system 86 in various ways, whether the control system is locally or remotely located. In one example, the control system 86 can cause the suction pump 66 to increase pressure in the annulus 20 at or near the surface by a predetermined amount automatically in response to the step 130 output indicating that a kick
- control system 86 will operate the controller 84 to cause the pump 66 to increase pressure in the annulus 20 by the predetermined amount (e.g., a percentage of the current annulus pressure, a particular difference in pressure, etc . ) .
- the predetermined amount could be preprogrammed into the control system 86, and/or the predetermined amount could be input, for example, via a human-machine interface.
- control over operation of the suction pump 66 can be returned to an automated system whereby an annulus, wellbore or standpipe pressure set point is maintained (which set point may be obtained, e.g., from a hydraulics model or manual input), the suction pump can be manually operated, or another manner of controlling the pump can be implemented.
- control system 86 can cause the suction pump 66 to decrease pressure in the annulus 20 by a predetermined amount automatically in response to the step 130 output indicating that a fluid loss has occurred, or is substantially likely to occur. For example, if the parameter signature matches (or substantially matches) the event signature for a fluid loss, then the control system 86 will operate the controller 84 to cause the suction pump 66 to decrease pressure in the annulus 20 by the predetermined amount (e.g., a percentage of the current annulus pressure, a particular difference in pressure, etc.).
- the predetermined amount e.g., a percentage of the current annulus pressure, a particular difference in pressure, etc.
- the predetermined amount could be preprogrammed into the control system 86, and/or the predetermined amount could be input, for example, via a human-machine interface.
- control over operation of the pump 66 can be returned to the automated system whereby an annulus, wellbore or standpipe pressure set point is maintained
- the pump can be manually operated, or another manner of controlling the pump can be implemented.
- control system 86 can provide an alert or an alarm to an operator that a particular event has occurred or is substantially likely to occur, the probability of the event occurring, etc. The operator can then take any needed remedial actions based on the
- alert/alarm or can override any actions taken by the control system 86 automatically in response to the step 130 output. If action has already been taken by the control system 86, the operator can undo or reverse such actions, if desired.
- control system 86 can switch between maintaining a desired annulus or wellbore pressure to maintaining a desired standpipe pressure in response to the step 130 output indicating that an event has occurred, or is substantially likely to occur.
- the suction pump 66 can be automatically controlled to thereby maintain any annulus, wellbore and/or standpipe pressure set point.
- the control system 86 can switch between such annulus, wellbore and standpipe pressure set point modes
- the control system 86 could switch from maintaining a desired wellbore pressure to maintaining a desired standpipe pressure. This switch may actually be performed after verifying that conditions are acceptable for making the switch, and after providing an operator with an option (such as, via a displayed alert) to initiate or override the switch, etc.
- control system 86 can
- the instructions or guidance may be provided by a local well site display, and/or may be transmitted between the well site and a remote location, etc.
- control system 86 can implement a well control procedure automatically in response to the step 130 output indicating that an event has occurred, or is substantially likely to occur.
- the well control procedure could include routing return flow of the fluid 18 to a conventional rig choke manifold 82 and gas buster 88 (see FIG. 1) designed for handling well control situations.
- the well control procedure could include the control system 86 automatically operating the pump 66 and/or choke 34 to optimally circulate out an undesired influx.
- control system 86 can switch flow of the fluid 18 from one suction pump 66 to another automatically, in response to the step 130 output indicating that one of the pumps has become inoperative or otherwise compromised, or is substantially likely to become so
- the switching from one pump 66 to another can be performed progressively and automatically, so that a desired annulus, wellbore and/or standpipe pressure can concurrently be maintained by the control system 86 during the switching process.
- control system 86 can modify or correct a pressure set point (e.g., received from a
- the control system 86 can operate the controller 84 using the modified/corrected set point, instead of the set point received from, e.g., the hydraulics model.
- the control system 86 can update the hydraulics and/or well model(s) with updated fluid 18 density values based on the detection of the fluid influx or loss event.
- control system 86 can
- the control system 86 can automatically communicate this to the hydraulics model, which will cease correcting the pressure set point based on actual
- control system 86 can automatically communicate this to the hydraulics and/or well model(s), which will adjust a volume of the annulus 20 and/or other parameters in the model(s).
- control system 86 can cause the suction pump 66 to decrease pressure in the annulus 20 automatically in response to the step 130 output indicating that excessive pressure exists in the wellbore 12 (or at least upstream of the pump) .
- a maximum pressure can be preprogrammed into the control system 86 so that, if the maximum pressure is exceeded, the suction pump 66 and/or choke 34 will be operated by the controller 84 to relieve the excess pressure.
- control system 86 can divert flow to a rig choke manifold 82, or to another choke
- control system 86 could also automatically operate the pump 66 and/or choke 34, to thereby relieve pressure under the RCD 22.
- control system 86 can modify an annulus 20 volume used by the hydraulics and/or well
- control system 86 could receive indications of rig heave from a conventional motion compensation system of the floating rig.
- the annulus 20 volume can be
- control system 86 modified/corrected by the control system 86 automatically in response to indications that the rig has risen or fallen, thereby enabling the annulus, wellbore or standpipe pressure set point to be updated based on the modified/corrected annulus volume.
- FIG. 6 a more detailed elevational view of the suction pump 66 is representatively illustrated, apart from the remainder of the system 10.
- the pump 66 draws the fluid 18 from a
- reservoir 140 which is in communication with the annulus 20 (or which is itself a section of the annulus), such that a level of the fluid 18 in the reservoir 140 corresponds to a fluid level in the annulus.
- the pump 66 reduces the level of the fluid 18 in the reservoir 140 (e.g., by drawing fluid from the reservoir at a greater rate than the fluid is flowed into the reservoir from the annulus 20), hydrostatic pressure in the reservoir and annulus is reduced. Conversely, if the pump 66 increases the level of the fluid 18 in the reservoir 140 (e.g., by drawing fluid from the reservoir at a rate less than the fluid is flowed into the reservoir from the annulus 20), hydrostatic pressure in the reservoir and annulus is increased.
- the reservoir 140 is open to atmosphere at the surface.
- the pump 66 could possibly (in certain circumstances) reduce the level of the fluid 18 in the reservoir 140 to the extent that air enters a suction conduit 138 for the pump 66.
- This event could be an indication that an undesired loss of fluid 18 is occurring downhole.
- the event can be detected, for example, by
- detecting a horsepower input to the pump 66 e.g., by monitoring electrical power draw by a pump with an electric motor, monitoring revolutions per minute of a diesel motor- powered pump, etc.).
- the horsepower input to the pump 66 could be used in the event signatures described above.
- FIG. 5 depicts the suction pump horsepower as one of the parameters in the kick and loss event signatures. It is conceived that the air drawn into the pump 66 will cause horsepower input to increase (e.g., in an attempt to draw the fluid 18 into the suction line 138), but other
- suction pump 66 horsepower can change.
- a change in properties (e.g., viscosity, density, temperature, gas content, etc.) of the fluid 18 can cause a change in the pump horsepower input for a corresponding flow rate, rpm, etc.
- an influx of formation fluid into the wellbore 12, or a loss of fluid 18 from the wellbore could be detected by monitoring
- the pump 66 specifications should provide for adequate net positive suction head, static suction lift and static discharge lift for a particular drilling operation.
- Some factors to consider in the design of the pump 66 include specific gravity, viscosity and temperature of the fluid 18 to be pumped, the pump's elevation (e.g., relative to sea level), atmospheric pressure, size and length of the suction and discharge lines 138, 136, range of fluid levels in the reservoir 140 to achieve corresponding desired pressure variations in the well, presence of particles (such as drill cuttings) in the fluid, etc.
- the annulus 20 is closed to the atmosphere at the surface, and the suction pump 66 is connected to the annulus below the RCD 22 and above the BOP stack 42.
- the annulus 20 is preferably closed to the
- a pressure control technique such as, applying suction pressure to the annulus, etc.
- a pressure control technique such as, applying suction pressure to the annulus, etc.
- the discharge line 136 can be connected to the fluid return line 30, to a discharge 134 at an elevation higher than the pump 66, to a discharge 132 at an elevation substantially the same as that of the pump, and/or to a discharge 130 at an elevation lower than the pump.
- the discharges 132, 134, 136 (and the return line 30, as depicted in FIG. 1) can be connected to the choke manifold 32, separator 48, shaker 50 and/or mud pit 52.
- the suction pump 66 in this example, can reduce pressure in the annulus 20 at the surface (and thereby reduce pressure at any location in the wellbore 12) by drawing fluid 18 from the annulus at a greater rate than the fluid is injected into the drill string 16 by the rig pump 68 (accounting for fluid lost to or gained from the
- the suction pump 66 can increase pressure in the annulus 20 at the surface (and thereby increase pressure at any location in the wellbore 12) by drawing fluid 18 from the annulus at a rate less than the fluid is injected into the drill string 16 by the rig pump 68 (accounting for fluid lost to or gained from the formation 64, cuttings carried with the fluid, etc.).
- the pump 66 can still be used to control pressure in the wellbore.
- the pump 66 in the FIG. 6 example could be used to control the level of the fluid 18 in the annulus 20, and if the wellbore 12 is closed to the atmosphere as in the FIG. 7 example, the pump could be used to vary pressure in the wellbore by varying a suction pressure applied by the pump, etc.
- the controller 84 can control operation of the pump 66 to automatically maintain a desired annulus, wellbore or standpipe pressure set point.
- the operation of the pump 66 e.g., flow rate, horsepower input, rpm, etc.
- the pump 66 can be controlled relative to the rig pump 68, so that the annulus, wellbore or standpipe pressure set point is maintained.
- the annulus 20, wellbore 12 and/or standpipe 26 pressure is/are monitored in real time (e.g., using the sensors 36, 60, 44) and, when a monitored pressure is less than the respective set point, the flow rate through the suction pump 66 is decreased to thereby increase the pressure, and when the monitored pressure is greater than the respective set point, the flow rate through the pump is increased to thereby decrease the pressure.
- This control can be performed automatically, in response to human command, etc .
- the suction pump 66 can be used to circulate the fluid 18 through the drill string 16 and annulus 12, even if the rig pump 68 is not used to inject the fluid into the drill string.
- the suction pump 66 can draw the fluid 18 from the mud pit 52 (see FIG. 1) to the standpipe 26, and then through the drill string 16 and annulus 20 back to the surface. This can be done whether or not the rig pump 68 is interconnected between the mud pit 52 and the standpipe 26.
- the suction pump 66 can be used to regulate pressure in the wellbore 12 while a connection is being made in the drill string 16, whether or not the fluid 18 is flowing through the drill string and annulus 20 while the connection is being made. If the fluid 18 does flow through the drill string 16 while the connection is being made, either of the FIGS. 6 & 7 configurations may be used to regulate wellbore pressure.
- FIG. 7 configuration may be more preferable, since hydrostatic pressure in the wellbore 12 can be conveniently adjusted by varying the level of the fluid 18 in the reservoir 140.
- the level of the fluid 18 in the reservoir 140 can be reduced while circulation is substantially ceased, in order to account for reduced friction pressure.
- the FIG. 7 configuration could be used to regulate wellbore pressure during the connection, for example, if a valve or other flow control device is used to prevent flow of the fluid 18 through the drill string 16.
- ECD Equivalent circulating density
- the friction pressure is a function in part of the pressure differential across the flow path the fluid 18 traverses (e.g., including the drill string 16 and annulus 20 in the system 10 example), it will be appreciated that by using the suction pump 66 to adjust the pressure in the annulus at or near the surface, the pressure differential across the annulus (and across the drill string, etc.) can be correspondingly adjusted.
- the suction pump 66 can be used to increase ECD by increasing the pressure differential across the annulus 20, and the pump can be used to decrease ECD by decreasing the pressure differential across the annulus.
- the return line 30 is connected to the annulus 20 via the wing valve 28 positioned between an annular blowout preventer (BOP) 144 and another annular seal 146 (such as, another annular BOP, a Shaffer Pressure Control While
- PCWD Drilling Drilling (PCWD) device, an RCD, etc.).
- the annular seal 146 does not necessarily seal against a pressure differential, but preferably does at least isolate the annulus 20 from the earth's atmosphere.
- the annulus 20 is not necessarily pressurized at or near the surface, but may instead be substantially balanced while the suction pump 66 pumps the fluid 18 from the annulus.
- the annular seal 146 seals off the annulus 20 between the drill string 16 and an outer housing of the BOP stack 42 above the wing valve 28.
- the fluid 18 can, in the FIG. 8 example, exit the BOP stack 42 via another wing valve 148 positioned below the lower annular BOP 144.
- the suction pump 66 can receive the fluid 18 from lower in the annulus 20. In some examples, this can enable the suction pump 66 to draw down the level of the fluid 18 in the annulus 20 (or in a reservoir 140 connected to the annulus), thereby reducing the hydrostatic pressure in the wellbore 12.
- Only one of the wing valves 28, 148 is preferably open at a time.
- the systems and methods described above allow well pressure to be conveniently adjusted by controlling operation of the suction pump 66 connected to the wellbore 12 via the annulus 20.
- an increase in a rate of fluid drawn from the annulus 20 by the pump 66 produces a corresponding decrease in pressure in the wellbore 12, and a decrease in the rate of fluid drawn from the annulus by the pump
- a well pressure control method can include regulating pressure in a wellbore 12 by operating a suction pump 66 which draws fluid 18 from an annulus 20 formed between a drill string 16 and the wellbore 12, the fluid 18 entering the suction pump 66 proximate the earth's surface.
- Operating the suction pump 66 can include increasing a rate of fluid 18 drawn from the annulus 20 by the suction pump 66, thereby reducing the wellbore 12 pressure.
- Operating the suction pump 66 can include decreasing a rate of the fluid 18 drawn from the annulus 20 by the suction pump 66, thereby increasing the wellbore 12 pressure.
- Regulating pressure may include maintaining an annulus pressure, wellbore pressure and/or standpipe pressure set point .
- Operating the suction pump 66 can include varying a flow rate of the suction pump 66 relative to a flow rate of a rig pump 68 which injects the fluid 18 into the drill string 16.
- the method can include detecting an event based on sensing at least one suction pump 66 parameter.
- the suction pump 66 parameter may comprise at least one of a group including pump horsepower, suction pressure, pressure differential across the pump, flow rate, and revolutions per minute.
- the event may comprise an undesired influx from a formation 64 into the wellbore 12, or an undesired loss from the wellbore 12 into the formation 64.
- the suction pump 66 parameter may comprise a lack of the fluid 18 entering the suction pump 66.
- the method can include determining a property of the fluid 18 based on a sensed suction pump 66 parameter.
- the fluid 18 property may comprise at least one of a group including viscosity, density, temperature, and gas content.
- Operating the suction pump 66 can include a control system 86 causing the suction pump 66 to change the wellbore 12 pressure in response to detection of an event.
- the event may comprise an undesired influx into the wellbore 12, and the control system 86 may cause the suction pump 66 to increase the wellbore 12 pressure in response to the
- the event may comprise an undesired loss from the wellbore 12, and the control system 86 may cause the suction pump 66 to reduce the wellbore 12 pressure in response to the detection of the undesired loss.
- the increase or reduction in the wellbore 12 pressure caused by the suction pump 66 may be followed by, or accompanied by the choke 34 being operated to respectively increase or reduce the wellbore 12 pressure.
- the control system 86 may automatically cause the suction pump 66 to change the wellbore 12 pressure in response to the detection of the event.
- the control system 86 may cause the suction pump 66 to change the wellbore 12 pressure by a predetermined amount in response to the detection of the event.
- Operating the suction pump 66 may comprise varying a fluid 18 level in a reservoir 140, thereby varying
- Varying the fluid 18 level in the reservoir 140 can include reducing the fluid 18 level while flow of the fluid 18 through the drill string 16 is substantially ceased.
- Regulating the wellbore 12 pressure can include
- Operating the suction pump 66 can comprise varying a suction pressure applied to the annulus 20 by the suction pump 66.
- Regulating the wellbore 12 pressure may comprise maintaining a desired suction pressure applied to the annulus 20 proximate the earth's surface.
- the suction pressure can be less than atmospheric pressure .
- the suction pump 66 may draw the fluid 18 through the drill string 16 and annulus 20, without any rig pump 68 injecting the fluid 18 into the drill string 16.
- the above disclosure also describes, in one example, another well pressure control method which can include regulating pressure in a wellbore 12 by operating a suction pump 66 which applies suction pressure to an annulus 20 formed between a drill string 16 and the wellbore 12.
- the suction pump 66 may receive fluid 18 which exits the annulus 20 below an annular blowout preventer 144, between an annular seal 146 and an annular blowout preventer 144, and/or between two annular blowout preventers 144, 146.
- a well drilling system In one example described above, a well drilling system
- the 10 can comprise a suction pump 66 positioned proximate the earth's surface.
- the suction pump 66 receives fluid 18 which exits an annulus 20 formed between a drill string 16 and a wellbore 12.
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- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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MX2014010132A MX353838B (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus. |
EP12869370.2A EP2817486A4 (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
PCT/US2012/026419 WO2013126064A1 (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
MYPI2014001703A MY172256A (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
AU2012370472A AU2012370472B2 (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
BR112014017674A BR112014017674A8 (en) | 2012-02-24 | 2012-02-24 | WELL PRESSURE CONTROL METHOD |
US13/773,149 US20130220600A1 (en) | 2012-02-24 | 2013-02-21 | Well drilling systems and methods with pump drawing fluid from annulus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2012/026419 WO2013126064A1 (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
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Publication Number | Publication Date |
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WO2013126064A1 true WO2013126064A1 (en) | 2013-08-29 |
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PCT/US2012/026419 WO2013126064A1 (en) | 2012-02-24 | 2012-02-24 | Well drilling systems and methods with pump drawing fluid from annulus |
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EP (1) | EP2817486A4 (en) |
AU (1) | AU2012370472B2 (en) |
BR (1) | BR112014017674A8 (en) |
MX (1) | MX353838B (en) |
WO (1) | WO2013126064A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11255180B2 (en) * | 2017-12-22 | 2022-02-22 | Halliburton Energy Services, Inc. | Robust early kick detection using real time drilling |
Citations (5)
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US6415877B1 (en) | 1998-07-15 | 2002-07-09 | Deep Vision Llc | Subsea wellbore drilling system for reducing bottom hole pressure |
US20030079912A1 (en) * | 2000-12-18 | 2003-05-01 | Impact Engineering Solutions Limited | Drilling system and method |
US20080035374A1 (en) * | 2004-09-22 | 2008-02-14 | Reitsma Donald G | Method of Drilling a Lossy Formation |
US20100038078A1 (en) * | 2008-08-15 | 2010-02-18 | Fink Joseph M | Down-hole liquid level control for hydrocarbon wells |
US20110303462A1 (en) * | 2010-06-15 | 2011-12-15 | Halliburton Energy Services, Inc. | Annulus pressure setpoint correction using real time pressure while drilling measurements |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US7178592B2 (en) * | 2002-07-10 | 2007-02-20 | Weatherford/Lamb, Inc. | Closed loop multiphase underbalanced drilling process |
US7984770B2 (en) * | 2008-12-03 | 2011-07-26 | At-Balance Americas, Llc | Method for determining formation integrity and optimum drilling parameters during drilling |
WO2012003101A2 (en) * | 2010-07-01 | 2012-01-05 | Agr Subsea A.S. | System and method for controlling wellbore pressure |
-
2012
- 2012-02-24 BR BR112014017674A patent/BR112014017674A8/en not_active IP Right Cessation
- 2012-02-24 MX MX2014010132A patent/MX353838B/en active IP Right Grant
- 2012-02-24 AU AU2012370472A patent/AU2012370472B2/en not_active Ceased
- 2012-02-24 EP EP12869370.2A patent/EP2817486A4/en not_active Withdrawn
- 2012-02-24 WO PCT/US2012/026419 patent/WO2013126064A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6415877B1 (en) | 1998-07-15 | 2002-07-09 | Deep Vision Llc | Subsea wellbore drilling system for reducing bottom hole pressure |
US20030079912A1 (en) * | 2000-12-18 | 2003-05-01 | Impact Engineering Solutions Limited | Drilling system and method |
US20080035374A1 (en) * | 2004-09-22 | 2008-02-14 | Reitsma Donald G | Method of Drilling a Lossy Formation |
US20100038078A1 (en) * | 2008-08-15 | 2010-02-18 | Fink Joseph M | Down-hole liquid level control for hydrocarbon wells |
US20110303462A1 (en) * | 2010-06-15 | 2011-12-15 | Halliburton Energy Services, Inc. | Annulus pressure setpoint correction using real time pressure while drilling measurements |
Non-Patent Citations (1)
Title |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11255180B2 (en) * | 2017-12-22 | 2022-02-22 | Halliburton Energy Services, Inc. | Robust early kick detection using real time drilling |
Also Published As
Publication number | Publication date |
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AU2012370472B2 (en) | 2015-10-01 |
EP2817486A4 (en) | 2016-03-02 |
EP2817486A1 (en) | 2014-12-31 |
BR112014017674A8 (en) | 2017-07-11 |
BR112014017674A2 (en) | 2017-06-20 |
MX353838B (en) | 2018-01-31 |
MX2014010132A (en) | 2014-09-08 |
AU2012370472A1 (en) | 2014-07-03 |
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