Control system and method for drilling stick-slip vibration monitoring

Abstract

The present invention provides a control system and method for monitoring stick-slip vibration during drilling. The control system includes a speed sensor for collecting speed data, a drilling pressure sensor for collecting drilling pressure data, and a pulse signal collector for collecting pulse data. A drill string located within the wellbore is connected to a drive device and a choke line on the surface, respectively. The speed sensor and drilling pressure sensor are respectively disposed on the drill string, and the pulse signal collector is disposed on the choke line. The detection signal output terminals of the speed sensor, the drilling pressure sensor, and the pulse signal collector are respectively connected to a detection signal receiving terminal of a controller, and the control signal output terminal of the controller is connected to a control terminal of the drive device. The present invention solves the technical problems of delayed and inaccurate monitoring of stick-slip vibration during drilling.

Description

Technical Field

[0001] The present invention relates to the field of drilling engineering, and further to a control system and method for monitoring stick-slip vibration in drilling, and in particular to a control system and method for monitoring stick-slip vibration in oil and gas, geothermal, and natural gas compound drilling. Background Art

[0002] Stick-slip vibration is a common occurrence in drilling projects in the oil and gas, geothermal, and natural gas hydrate sectors. Stick-slip vibration is a self-excited oscillation phenomenon generated by the shearing and rock-breaking process of PDC drill bits (i.e., polycrystalline diamond compact drill bits). It is a common factor restricting the safe and efficient drilling of deep, ultra-deep, and horizontal wells, and is one of the key factors leading to low rock-breaking efficiency and downhole drill tool failure. With the widespread application of PDC drill bits, the problem of stick-slip vibration during drilling and its harmful effects are becoming increasingly prominent.

[0003] Low-frequency, high-amplitude stick-slip vibration can negatively impact drilling speed and safety, including damage to drill bit cutters, instability of the directional toolface, damage to drill tool joints due to overload, fatigue damage to drill tools, and even, in severe cases, tool breakage. Its destructive power has made it a significant risk factor in deep and horizontal well drilling. Currently, stick-slip vibration is assessed through post-drilling analysis, using inversion analysis of drill bit damage characteristics or downhole vibration data. This results in a hysteresis in the stick-slip vibration, making it difficult to control in real time.

[0004] Currently, there is no effective solution to the problems of delayed and low accuracy in monitoring drilling stick-slip vibration in related technologies.

[0005] Therefore, the inventors, relying on their many years of experience and practice in related industries, propose a control system and method for drilling stick-slip vibration monitoring to overcome the shortcomings of the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a control system and method for monitoring stick-slip vibration in drilling, which can monitor and control the stick-slip vibration phenomenon in drilling in real time both on the ground and underground without affecting normal drilling operations. It has a high degree of automation, effectively reduces the risk of failure of underground drilling tools, and improves the service life of the drill bit and drilling efficiency.

[0007] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] The present invention provides a control system for monitoring stick-slip vibration in drilling, the control system for monitoring stick-slip vibration in drilling comprising a rotation speed sensor for collecting rotation speed data, a weight-on-bit sensor for collecting weight-on-bit data, and a pulse signal collector for collecting pulse data, wherein;

[0009] The drill string located in the wellbore is respectively connected to the driving device and the throttle pipeline on the ground, the speed sensor and the drilling pressure sensor are respectively arranged on the drill string, and the pulse signal collector is arranged on the throttle pipeline. The detection signal output end of the speed sensor, the detection signal output end of the drilling pressure sensor and the detection signal output end of the pulse signal collector are respectively connected to the detection signal receiving end of the controller, and the control signal output end of the controller is connected to the control end of the driving device.

[0010] In a preferred embodiment of the present invention, a four-way connector is provided at the wellhead, and the drill string located in the wellbore is respectively connected to the throttling pipeline and the drill string located on the ground through the four-way connector, the driving device and the speed sensor are respectively provided on the drill string located on the ground, and the drilling pressure sensor is connected to the output shaft of the driving device.

[0011] In a preferred embodiment of the present invention, a throttle valve is provided on the throttle pipeline between the pulse signal collector and the four-way connector.

[0012] In a preferred embodiment of the present invention, the drill string located in the wellbore is placed in the annulus of the wellbore, and the top and bottom ends of the drill string located in the wellbore are respectively connected to the four-way connector and the downhole drilling tool, and a drill bit is provided at the bottom of the downhole drilling tool.

[0013] In a preferred embodiment of the present invention, a blowout preventer is provided between the four-way connector and the drill string located on the ground.

[0014] In a preferred embodiment of the present invention, an oscilloscope is arranged between the pulse signal collector and the controller, the detection signal output end of the pulse signal collector is connected to the detection signal receiving end of the oscilloscope, and the waveform output end of the oscilloscope is connected to the detection signal receiving end of the controller.

[0015] In a preferred embodiment of the present invention, the controller includes a drilling parameter display.

[0016] The present invention provides a method for monitoring stick-slip vibration in drilling, the method comprising the following steps:

[0017] Step S1: collecting rotation speed data and weight on bit data of the drill string in the wellbore, and simultaneously collecting pulse data in the throttle pipe on the ground;

[0018] Step S2: comparing the collected rotational speed data, the bit weight data, and the pulse data with a preset rotational speed data threshold, a preset bit weight data threshold, and a preset pulse data threshold;

[0019] Step S3: If any one of the rotational speed data, the bit weight data and the pulse data exceeds the corresponding preset threshold range, the rotational speed and bit weight of the drill string are adjusted or the downhole drilling tool in the wellbore is adjusted so that the rotational speed data, the bit weight data and the pulse data are all restored to the corresponding preset threshold range.

[0020] In a preferred embodiment of the present invention, step S2 includes:

[0021] Step S201: transmitting the collected rotation speed data, the bit pressure data, and the pulse data to a controller respectively;

[0022] Step S202: comparing the collected rotational speed data, the bit weight data, and the pulse data with a preset rotational speed data threshold, a preset bit weight data threshold, and a preset pulse data threshold, respectively, by the controller;

[0023] Step S203: displaying the collected rotation speed data, the bit pressure data, the pulse data and the comparison result respectively through the controller.

[0024] In a preferred embodiment of the present invention, in step S3, the rotation speed and the bit pressure of the drill string are adjusted by the controller.

[0025] As described above, the control system and method for monitoring stick-slip vibration in drilling of the present invention have the following features and advantages: a speed sensor and a bit pressure sensor are respectively arranged on the drill string, and a pulse signal collector is arranged on the throttle pipeline. During the drilling operation, the speed sensor and the bit pressure sensor can respectively collect the speed data and bit pressure data of the drill string located in the wellbore in real time. At the same time, the pulse data in the throttle pipeline can be collected in real time by the pulse signal collector located on the ground, thereby realizing simultaneous monitoring in both ground and underground modes. If it is found that the collected data exceeds the preset threshold, the drill string can be restored to a normal operating state by adjusting the speed and bit pressure of the drill string or adjusting the downhole drill tool located in the wellbore, thereby effectively controlling the stick-slip vibration phenomenon in drilling, greatly reducing the risk of failure of the downhole drill tool, improving the service life of the drill bit and the drilling efficiency, and being conducive to the long-term and normal progress of the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0027] in:

[0028] Figure 1 The figure is a schematic structural diagram of a control system for monitoring stick-slip vibration in drilling according to the present invention.

[0029] Figure 2This is a control structure block diagram of the control system for drilling stick-slip vibration monitoring according to the present invention.

[0030] The accompanying drawings in the present invention are:

[0031] 1. Controller; 2. Oscilloscope;

[0032] 3. Pulse signal collector; 4. Throttle valve;

[0033] 5. Downhole drilling tools; 6. Drill bit;

[0034] 7. Drill string; 8. Annulus;

[0035] 9. Wellbore; 10. Cross-connector;

[0036] 11. BOP; 12. Speed ​​sensor;

[0037] 13. Driving device; 14. WOB sensor;

[0038] 15. Throttle pipeline. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0040] Implementation Method 1

[0041] like Figure 1 As shown, the present invention provides a control system for monitoring stick-slip vibration during drilling. The control system includes a rotational speed sensor 12, a weight-on-bit sensor 14, and a pulse signal collector 3. The rotational speed sensor 12 is used to collect rotational speed data of a drill string 7 located within a wellbore 9. The weight-on-bit sensor 14 is used to collect weight-on-bit data of the drill string 7 located within the wellbore 9. The pulse signal collector 3 is used to collect pulse data from a choke line 15 located on the surface. The drill string 7 located within the wellbore 9 is connected to a drive device 13 and a choke line 15 located on the surface, respectively. The rotational speed sensor 12 and the weight-on-bit sensor 14 are respectively disposed on the drill string 7. The pulse signal collector 3 is disposed on the choke line 15. The detection signal output terminals of the rotational speed sensor 12, the detection signal output terminals of the weight-on-bit sensor 14, and the detection signal output terminals of the pulse signal collector 3 are respectively connected to the detection signal receiving terminal of a controller 1. The control signal output terminal of the controller 1 is connected to the control terminal of the drive device 13.

[0042] The present invention respectively arranges a speed sensor 12 and a bit pressure sensor 14 on the drill string 7, and arranges a pulse signal collector 3 on the throttling pipeline 15. During the drilling operation, the speed data of the drill string 7 located in the wellbore 9 can be collected in real time by the speed sensor 12, and the bit pressure data of the drill string 7 located in the wellbore 9 can be collected in real time by the bit pressure sensor 14. At the same time, the pulse data in the throttling pipeline 15 can be collected in real time by the pulse signal collector 3 located on the ground, thereby realizing simultaneous monitoring of both ground and underground modes. If it is found that the collected data exceeds a preset threshold, the drill string 7 can be restored to a normal operating state by adjusting the speed and bit pressure of the drill string 7 or adjusting the downhole drill tool 5 located in the wellbore 9, thereby effectively controlling the drilling stick-slip vibration phenomenon, greatly reducing the failure risk of the downhole drill tool 5, improving the service life of the drill bit and the drilling efficiency, and being conducive to the long-term and normal progress of the drilling operation.

[0043] In an optional embodiment of the present invention, Figure 1 As shown, a four-way connector 10 is provided at the wellhead. The top end of the drill string 7 located in the wellbore 9 is connected to the throttling pipeline 15 and the bottom end of the drill string 7 located on the ground through the four-way connector 10. The driving device 13 and the speed sensor 12 are respectively provided on the drill string 7 located on the ground, and the bit pressure sensor 14 is connected to the output shaft of the driving device 13.

[0044] In an optional embodiment of the present invention, Figure 1 As shown, the drill string 7 located in the wellbore 9 is placed in the annulus 8 of the wellbore 9, and the top end of the drill string 7 located in the wellbore 9 is connected to the four-way connector 10, and the bottom end of the drill string 7 located in the wellbore 9 is connected to the downhole drilling tool 5, and a drill bit 6 is provided at the bottom of the downhole drilling tool 5.

[0045] Furthermore, the downhole drilling tool 5 may be equipped with a vibration measurement device (e.g., a vibration sensor) and / or a stick-slip vibration control device to directly detect and transmit vibration data within the wellbore 9, resulting in more accurate detection results. Of course, the specific configuration of the downhole drilling tool 5 can be various and is not limited here.

[0046] Further, such as Figure 1 As shown, a blowout preventer 11 is provided between the four-way connector 10 and the drill string 7 on the ground to prevent blowout.

[0047] Further, such as Figure 1As shown, a throttle valve 4 is installed on the throttle pipe 15 between the pulse signal collector 3 and the four-way connector 10. The throttle valve 4 can control the opening and closing of the throttle pipe 15. The pulse signal collector 3 is installed near the throttle valve 4 and can collect downhole pulse data. The downhole pulse data collected by the pulse signal collector 3 includes but is not limited to pulse signals induced by stick-slip vibration of the drill bit 6 and pulse signals emitted by the downhole drilling tool 5.

[0048] In an optional embodiment of the present invention, Figure 1 、 Figure 2 As shown, an oscilloscope 2 is provided between the pulse signal collector 3 and the controller 1. The detection signal output terminal of the pulse signal collector 3 can be directly connected to the detection signal receiving terminal of the controller 1; the detection signal output terminal of the pulse signal collector 3 can also be connected to the detection signal receiving terminal of the oscilloscope 2, and the waveform output terminal of the oscilloscope 2 is connected to the detection signal receiving terminal of the controller 1. The speed data and the bit weight data collected by the speed sensor 12 and the bit weight sensor 14 can be displayed by the controller 1, and the pulse data collected by the pulse signal collector 3 can be displayed by the oscilloscope 2. When monitoring stick-slip vibration, only the drilling parameter display or the oscilloscope 2 can be enabled, or both can be enabled.

[0049] Furthermore, controller 1 includes, but is not limited to, a drilling parameter display for real-time display of collected data. This includes, but is not limited to, real-time display of rotational speed data, weight-on-bit data, expandable drill string torque data, and wellhead drill string vibration data. Since the drilling parameter display is connected to oscilloscope 2, it can display and store data transmitted by oscilloscope 2.

[0050] The characteristics and advantages of the control system for drilling stick-slip vibration monitoring of the present invention are:

[0051] 1. The control system for monitoring stick-slip vibration during drilling can collect the rotation speed data and the drilling pressure data of the drill string 7 in real time through the rotation speed sensor 12 and the drilling pressure sensor 14 (which is a ground monitoring method). At the same time, it can collect the pulse data in the well in real time through the pulse signal collector 3, realizing simultaneous monitoring in both ground and underground modes with high accuracy, effectively reducing the risk of failure of the downhole drilling tool 5.

[0052] Second, the control system for monitoring stick-slip vibration in drilling can display the collected data in real time. When it is found that the stick-slip vibration phenomenon in the well exceeds the standard, the drill string 7 can be restored to a normal operating state by adjusting the rotation speed and bit pressure of the drill string 7 or adjusting the downhole drill tool 5 in the wellbore 9, thereby effectively controlling the stick-slip vibration phenomenon in drilling, improving the service life of the drill bit and drilling efficiency, and facilitating the long-term and normal operation of the drilling operation.

[0053] Implementation Method 2

[0054] The present invention provides a method for monitoring stick-slip vibration in drilling, which comprises the following steps:

[0055] Step S1: The rotation speed sensor 12 collects rotation speed data of the drill string 7 in the wellbore 9, the weight-on-bit data of the drill string 7 in the wellbore 9 is collected by the weight-on-bit sensor 14, and the pulse signal collector 3 collects pulse data in the throttle pipe 15 on the surface.

[0056] Step S2: comparing the collected rotational speed data, bit weight data and pulse data with the preset rotational speed data threshold, bit weight data threshold and pulse data threshold respectively;

[0057] Furthermore, step S2 includes:

[0058] Step S201: The collected rotational speed data, the bit pressure data and the pulse data are transmitted to the controller 1 respectively. The threshold range of the rotational speed data, the threshold range of the bit pressure data and the threshold range of the pulse data can be pre-set in the controller 1;

[0059] Step S202: The controller 1 compares the collected rotational speed data, bit pressure data, and pulse data with a preset rotational speed data threshold, a preset bit pressure data threshold, and a preset pulse data threshold, respectively;

[0060] Step S203: The controller 1 displays the collected rotation speed data, drilling pressure data, pulse data and comparison results respectively.

[0061] Step S3: If any one of the rotational speed data, the bit weight data, and the pulse data exceeds the corresponding preset threshold range, the controller 1 is adjusted to control the driving device 13, thereby adjusting the rotational speed and bit weight of the drill string 7, or adjusting the combination of the downhole drilling tools 5 located in the wellbore 9, so that the rotational speed data, the bit weight data, and the pulse data are all restored to the corresponding preset threshold range, thereby achieving the effect of coordinated control of stick-slip vibration.

[0062] The characteristics and advantages of the method for monitoring stick-slip vibration in drilling according to the present invention are:

[0063] This method for monitoring drilling stick-slip vibration can monitor and control drilling stick-slip vibration in real time both on the ground and underground without affecting normal drilling operations. It has a high degree of automation, effectively reduces the risk of downhole drill tool failure, and improves the service life of the drill bit and drilling efficiency.

[0064] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A control system for monitoring stick-slip vibration in drilling, characterized in that: The control system for drilling stick-slip vibration monitoring includes a rotation speed sensor for collecting rotation speed data, a drilling pressure sensor for collecting drilling pressure data, and a pulse signal collector for collecting pulse data, wherein; The drill string located in the wellbore is respectively connected to the driving device and the throttle pipeline on the ground; the rotation speed sensor and the bit pressure sensor are respectively arranged on the drill string; the pulse signal collector is arranged on the throttle pipeline; the detection signal output end of the rotation speed sensor, the detection signal output end of the bit pressure sensor, and the detection signal output end of the pulse signal collector are respectively connected to the detection signal receiving end of the controller; and the control signal output end of the controller is connected to the control end of the driving device; During the drilling operation, the rotation speed sensor collects the rotation speed data of the drill string in the wellbore in real time, the weight on bit sensor collects the weight on bit data of the drill string in the wellbore in real time, and the pulse signal collector located on the ground collects the pulse data in the throttle line in real time, the pulse data including the pulse signal induced by the stick-slip vibration of the drill bit and the pulse signal emitted by the downhole drilling tool; When any one of the collected rotational speed data, bit pressure data and pulse data exceeds the corresponding preset threshold range, the drill string is restored to a normal operating state by adjusting the rotational speed and bit pressure of the drill string or adjusting the combination of downhole drilling tools in the wellbore.

2. The control system for drilling stick-slip vibration monitoring according to claim 1, characterized in that: A four-way connector is provided at the wellhead, and the drill string located in the wellbore is connected to the throttling pipeline and the drill string located on the ground through the four-way connector. The driving device and the speed sensor are respectively provided on the drill string located on the ground, and the drilling pressure sensor is connected to the output shaft of the driving device.

3. The control system for drilling stick-slip vibration monitoring according to claim 2, characterized in that: A throttle valve is provided on the throttle pipeline between the pulse signal collector and the four-way connector.

4. The control system for drilling stick-slip vibration monitoring according to claim 2, characterized in that: The drill string in the wellbore is placed in the annulus of the wellbore, and the top and bottom ends of the drill string in the wellbore are respectively connected to the four-way connector and the downhole drilling tool, and a drill bit is provided at the bottom of the downhole drilling tool.

5. The control system for monitoring stick-slip vibration in drilling according to claim 2, wherein: A blowout preventer is provided between the four-way connector and the drill string located on the ground.

6. The control system for drilling stick-slip vibration monitoring according to claim 1, characterized in that: An oscilloscope is provided between the pulse signal collector and the controller. The detection signal output end of the pulse signal collector is connected to the detection signal receiving end of the oscilloscope. The waveform output end of the oscilloscope is connected to the detection signal receiving end of the controller.

7. The control system for drilling stick-slip vibration monitoring according to claim 1, characterized in that: The controller includes a drilling parameter display instrument.

8. A method for monitoring stick-slip vibration in drilling, which is implemented by using the control system for monitoring stick-slip vibration in drilling according to any one of claims 1 to 6, characterized in that: The method for monitoring stick-slip vibration in drilling comprises the following steps: Step S1: collecting rotation speed data and weight on bit data of the drill string in the wellbore, and simultaneously collecting pulse data in the throttle pipe on the ground; Step S2: comparing the collected rotational speed data, the bit weight data, and the pulse data with a preset rotational speed data threshold, a preset bit weight data threshold, and a preset pulse data threshold; Step S3: If any one of the rotational speed data, the bit weight data and the pulse data exceeds the corresponding preset threshold range, the rotational speed and bit weight of the drill string are adjusted or the downhole drilling tool in the wellbore is adjusted so that the rotational speed data, the bit weight data and the pulse data are all restored to the corresponding preset threshold range.

9. The method for monitoring stick-slip vibration during drilling according to claim 8, wherein: The step S2 comprises: Step S201: transmitting the collected rotation speed data, the bit pressure data, and the pulse data to a controller respectively; Step S202: comparing the collected rotational speed data, the bit weight data, and the pulse data with a preset rotational speed data threshold, a preset bit weight data threshold, and a preset pulse data threshold, respectively, by the controller; Step S203: displaying the collected rotation speed data, the bit pressure data, the pulse data and the comparison result respectively through the controller.

10. The method for monitoring stick-slip vibration during drilling according to claim 9, wherein: In step S3, the rotation speed and the bit pressure of the drill string are adjusted by the controller.

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