Overflow and leakage monitoring alarm system

Abstract

The utility model discloses an overflow and leakage monitoring and alarming system. The system comprises an overflow and leakage monitoring sledge, a data acquisition device, an overflow and leakage monitoring device and an alarming device, an overflow leakage monitoring sledge with a mass flow meter is connected to a slurry return pipe of conventional drilling, and drilling parameters such as pump speed, outlet flow, outlet pressure, vertical pipe pressure, slurry liquid level in a slurry tank, drilling time, drilling pressure, drilling disc rotating speed and gas logging total hydrocarbon are obtained by using a data acquisition device and a data transmission system; a software system of the overflow leakage monitoring and alarming system has transmission, input and setting functions, meanwhile, graphic display, digital display and data transmission are carried out on collected or calculated data, various well drilling working conditions are met through calculation, comparison and decision making, overflow or leakage in the well drilling and completion process is accurately found in a lag-free mode, and alarming is carried out. And the well control risk, reservoir pollution and non-production time are reduced, so that the drilling efficiency is improved, and the drilling period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of automated monitoring and control, and particularly to an overflow and loss monitoring and alarm system. Background Art

[0002] During the process of oil and gas drilling operations, the timeliness and accuracy of overflow and loss monitoring and alarm directly affect the safe production of drilling operations, drilling costs, drilling efficiency, environmental protection, personnel injuries, and losses of facilities and equipment, and are the prerequisite guarantees for realizing safe drilling production.

[0003] At present, there are two methods for monitoring overflow and loss. One is to monitor overflow and loss by measuring the mud volume in each mud pit through installing liquid level sensors in the mud tank. This method has monitoring blind spots, delays, and inaccuracies due to factors such as the large area of the mud tank, unstable stirred liquid level in the tank, the presence of bubbles, the volume of the pipeline from the wellhead to the mud tank, feeding, discharging, and backflow. The other is to form a closed drilling fluid circulation system through a rotating control head, measure the inlet flow rate with a pump stroke sensor and the outlet flow rate with a mass flow meter, collect the inlet and outlet flow rates and drilling parameters through a PLC data acquisition system, and the overflow and loss monitoring software system calculates, compares, and judges the engineering parameters and inlet and outlet flow rates in real time to achieve overflow and loss alarm. However, this method must use a rotating control head, which increases drilling costs and non-production time, so it cannot meet the overflow and loss monitoring of different drilling methods.

[0004] Therefore, how to provide an overflow and loss monitoring and alarm system that can meet various drilling methods is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an overflow and loss monitoring and alarm system. To solve the problems existing in the current overflow and loss monitoring and meet the overflow and loss monitoring of various drilling methods, an overflow and loss monitoring skid is connected to the return mud pipe. The mass flow meter measures the outlet flow rate, the pump stroke sensor is used to measure the inlet flow rate, the inlet and outlet flow rates and drilling parameters are collected through a PLC data acquisition system, and the overflow and loss monitoring software system calculates, compares, and judges the drilling engineering parameters and inlet and outlet flow rates in real time to achieve non-lagging overflow and loss monitoring and alarm.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An overflow and loss monitoring and alarm system includes: an overflow and loss monitoring skid, a data acquisition device, an overflow and loss monitoring device, and an alarm device;

[0008] A mass flow meter is arranged on the overflow and loss monitoring skid;

[0009] The data acquisition device includes a PLC and a mud logging industrial control computer. The mass flowmeter is connected to the PLC. The PLC and the mud logging industrial control computer collect drilling parameters in real time and transmit the collected parameters to the database of the overflow and loss monitoring device.

[0010] A data input module is provided in the overflow and loss monitoring device. The parameters input by the data input module are stored in the database. The database feeds back the parameters input by the data input module and the drilling parameters collected in real time by the PLC and the mud logging industrial control computer to the digital display module, the graphic display module, and the data processing module provided in the overflow and loss monitoring device. After being processed by the data processing module, it is fed back to the alarm device.

[0011] The alarm device receives the instructions issued by the overflow and loss monitoring device and executes the alarm.

[0012] Preferably, the mass flowmeter is connected to the PLC through a network cable. The PLC, the mud logging industrial control computer, and the data input module are respectively connected to the database of the overflow and loss monitoring device through network cables. The data processing module is connected to the alarm device through a network cable. The database of the overflow and loss monitoring device is connected to the digital display module, the graphic display module, and the data processing module of the overflow and loss monitoring device through data cables.

[0013] Preferably, the overflow and loss monitoring skid includes a return slurry pipe, a first branch pipe, a second branch pipe, a third branch pipe, and a tee. The first branch pipe and the second branch pipe are respectively connected to the return slurry pipe. The tee is respectively connected to the first branch pipe, the second branch pipe, and the third branch pipe. A control pressure pipe connection port and a kill pipe connection port are respectively provided on the third branch pipe. A first valve is provided on the return slurry pipe between the connection ports of the first branch pipe and the second branch pipe. A second valve is provided on the first branch pipe. A third valve is provided on the second branch pipe. A fourth valve is provided at the control pressure pipe connection port. A fifth valve is provided at the kill pipe connection port. The mass flowmeter is provided on the second branch pipe.

[0014] Preferably, the inlet of the return slurry pipe is connected to the anti-overflow pipe, and the outlet is connected to the mud tank.

[0015] Preferably, a rotating control head is connected to the inlet of the return slurry pipe. The rotating control head is connected to the overflow pipe. A sixth valve is provided at the inlet of the return slurry pipe.

[0016] Preferably, the drilling parameters collected by the PLC include inlet flow rate, outlet flow rate, standpipe pressure, outlet pressure, and mud tank liquid level. The drilling parameters collected by the mud logging industrial control computer include weight on bit, drilling time, rotary table speed, gas logging total hydrocarbon, well depth, and bit depth.

[0017] Preferably, the parameters input by the data input module include warning parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure, and stroke length.

[0018] Preferably, the alarm device includes a driller's display alarm, a supervisor's display alarm, and an engineer's display alarm, and all three are connected to the data processing module via a network cable.

[0019] The present invention also provides a method for monitoring and alarming overflow and loss during drilling, including the following steps:

[0020] (1) Data acquisition step: Store the drilling parameters collected by the data acquisition device in real time and the parameters input by the data input module in the database of the overflow and loss monitoring device; the drilling parameters collected by the data acquisition device include inlet flow rate, outlet flow rate, standpipe pressure, outlet pressure, mud tank level, hook load, drilling time, rotary table speed, gas logging total hydrocarbon, well depth, and bit depth.

[0021] (2) Parameter setting step: Store the parameters input by the data input module in the database of the overflow and loss monitoring device; the parameters input by the data input module include pre-alarm parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure, and stroke length.

[0022] (3) Calculation, comparison, decision-making, warning, and alarm steps: First, analyze and judge that when the hook load, rotary table drilling speed, and inlet flow rate are constant, if the drilling time changes, it indicates that a new formation is being drilled, and overflow or loss may occur, and a pre-alarm is issued; set the alarm limit value of the cumulative overflow volume or loss volume in the alarm parameters, and issue an alarm when the limit value is exceeded.

[0023] Preferably, the alarm limit value of the cumulative overflow volume or loss volume set in the alarm parameters includes a first-level alarm limit value and a second-level alarm limit value. When the first-level alarm limit value is exceeded, a first-level alarm is issued; when the second-level alarm limit value is exceeded, a second-level alarm is issued, confirming that overflow or loss has occurred, and requiring the well team to immediately shut in the well.

[0024] With the above technical solution, compared with the prior art, the present invention provides an overflow and loss monitoring and alarm system. By connecting an overflow and loss monitoring skid with a high-precision mass flowmeter to the return mud pipe of a conventional drilling operation, and using a PLC data acquisition system and a data transmission system, drilling parameters such as pump speed, outlet flow rate, outlet pressure, standpipe pressure, mud level in the mud tank, drilling time, drilling pressure, rotary table speed, and total hydrocarbon in gas logging are obtained and input into an industrial control computer equipped with the overflow and loss monitoring and alarm system software. The overflow and loss monitoring and alarm system software has functions of transmission, input, and setting, and simultaneously performs graphical display, digital display, and data transmission on the collected or calculated data. Through calculation, comparison, and decision-making, early warning and alarm of overflow and loss without lag are achieved. Using this overflow and loss monitoring and alarm system is applicable to different drilling methods such as conventional drilling, underbalanced drilling, and managed pressure drilling, and also meets various drilling conditions thereof, enabling the discovery of overflow or loss during the drilling and completion process without lag and accurately alarming, reducing well control risks, reservoir pollution, and non-productive time, thereby improving drilling efficiency and saving the drilling cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on the provided drawings without creative efforts.

[0026] Figure 1 The drawings are the structural diagram of an overflow and loss monitoring and alarm system according to Embodiment 1 of the present invention;

[0027] Figure 2 The drawings are the structural diagram of an overflow and loss monitoring and alarm system according to Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0029] Embodiment 1

[0030] As shown in the attached Figure 1 figures, for the overflow and loss monitoring of conventional drilling, the adopted overflow and loss monitoring and alarm system includes: an overflow and loss monitoring skid 1, a data acquisition device 2, an overflow and loss monitoring device 3, and an alarm device 4;

[0031] A mass flowmeter 11 is provided on the overflow and loss monitoring skid 1;

[0032] The data acquisition device 2 includes a PLC 21 and a mud logging industrial control computer 22. The mass flowmeter 11 is connected to the PLC 21. The PLC 21 and the mud logging industrial control computer 22 collect drilling parameters in real time and transmit the collected drilling parameters to the database 31 of the overflow and loss monitoring device 3. The drilling parameters collected by the PLC 21 include inlet flow rate, outlet flow rate, riser pressure, outlet pressure, and mud tank liquid level. The drilling parameters collected by the mud logging industrial control computer 22 include weight on bit, penetration rate, rotary table speed, total hydrocarbon of gas logging, well depth, and bit depth;

[0033] The overflow and loss monitoring device 3 is provided with a data input module 32. The parameters input by the data input module 32 are stored in the database 31. The input parameters include warning parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure, and stroke length. The database 31 feeds back the parameters input by the data input module 32 and the drilling parameters collected in real time by the PLC 21 and the mud logging industrial control computer 22 to the digital display module 33, the graphic display module 34, and the data processing module 35 provided in the overflow and loss monitoring device 3. After being processed by the data processing module 35, it is fed back to the alarm device 4;

[0034] The alarm device 4 receives the instructions sent by the overflow and loss monitoring device 3 and executes the alarm. The alarm device 4 includes a driller display alarm 41, a supervisor display alarm 42, and an engineer display alarm 43. All three are connected to the data processing module 35 through a network cable.

[0035] In this structure, the mass flowmeter 11 is connected to the PLC 21 through a network cable and transmits the collected information to the PLC 21. The PLC 21, the mud logging industrial control computer 22, and the data input module 32 are respectively connected to the database 31 of the overflow and loss monitoring device 3 through a network cable. The data processing module 35 is connected to the alarm device 4 through a network cable. The database 31 of the overflow and loss monitoring device 3 is connected to the digital display module 33, the graphic display module 34, and the data processing module 35 of the overflow and loss monitoring device 3 through data lines.

[0036] Among them, the overflow loss monitoring skid 1 includes a return slurry pipe 12, a first branch pipe 13, a second branch pipe 14, a third branch pipe 15 and a tee 16. The first branch pipe 13 and the second branch pipe 14 are respectively connected to the return slurry pipe 12, and the tee 16 is respectively connected to the first branch pipe 13, the second branch pipe 14 and the third branch pipe 15. A control pressure pipe connection port 151 and a kill pipe connection port 152 are respectively arranged on the third branch pipe 15. A first valve 121 is arranged on the return slurry pipe 12 between the connection port of the first branch pipe 13 and the connection port of the second branch pipe 14. A second valve 131 is arranged on the first branch pipe 13. A third valve 141 is arranged on the second branch pipe 14. A fourth valve 153 is arranged at the control pressure pipe connection port 151. A fifth valve 154 is arranged at the kill pipe connection port 152. The mass flowmeter 11 is arranged on the second branch pipe 14. The inlet of the return slurry pipe 12 is connected to an anti-overflow pipe, and the outlet is connected to a mud tank.

[0037] During drilling monitoring, the second valve 131 and the third valve 141 are opened, and the first valve 121, the fourth valve 153 and the fifth valve 154 are closed. The returned mud passes through the return slurry pipe 12, the mass flowmeter 11 of the overflow loss monitoring skid 1, then returns to the return slurry pipe 12, flows into the mud return trough and then enters the mud tank. Through the opening and closing of the above valves, the returned mud passes through the overflow loss monitoring skid 1, and the outlet flow rate and outlet pressure are monitored, so as to realize data acquisition.

[0038] During kill monitoring, the kill throttle channel, the fourth valve 153 and the third valve 141 are opened, and the first valve 121, the second valve 131 and the fifth valve 154 are closed. The returned mud passes through the kill throttle manifold, flows through the mass flowmeter 11 of the overflow loss monitoring skid 1, then returns to the return slurry pipe 12, flows into the mud return trough and then enters the mud tank. The returned mud passes through the overflow loss monitoring skid 1, and the outlet flow rate and outlet pressure are obtained, so as to realize data acquisition.

[0039] The principle and process of the overflow loss monitoring of this system are as follows:

[0040] (1) Data acquisition step: The parameters of the mass flowmeter 11 collected by the PLC 21 in the data acquisition device 2, as well as the drilling parameters (inlet flow rate, outlet flow rate, riser pressure, outlet pressure, mud tank liquid level) and the drilling parameters (drilling pressure, drilling time, rotary table speed, gas logging total hydrocarbon, well depth and bit depth) collected by the mud logging industrial computer 22 are collected;

[0041] (2) Parameter setting step: The parameters (pre-alarm parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure and stroke length) input by the data input module 32 are stored in the database 31 of the overflow loss monitoring device 3;

[0042] (3) Calculation, comparison, decision-making, pre-alarm and alarm steps: Calculate the difference between the inlet and outlet volumes using the difference between the inlet flow rate and the outlet flow rate, and display the data and curve graphs. In the alarm parameter settings, when the weight on bit, rotary table speed, and inlet flow rate remain unchanged, if the rate of penetration changes, it indicates that the formation lithology has changed, and it is possible to drill into an overflow or lost circulation formation, and a pre-alarm for overflow or lost circulation is carried out. The calculation formula for the inlet flow rate = 3 × 3.14 × D 2 / 4 × L × V × Q, where D is the diameter of the mud pump liner; L is the stroke length; V is the pump speed; Q is the pump efficiency; the difference between the inlet and outlet flow rates = outlet flow rate - inlet flow rate. When the difference between the inlet and outlet flow rates is positive, it is an overflow, and when it is negative, it is a lost circulation; When a positive value is obtained, it is the overflow volume, and when a negative value is obtained, it is the lost circulation volume. i is the time point, in seconds, and must be greater than 1 and an integer. n is the time period and is an integer; The measured weight on bit collected is the average of the measured weight on bit at n time points = (WOB1 + WOB2 + WOB3 +..... + WOBn) / n. Set the stable weight on bit range, and compare the collected weight on bit with the set stable weight on bit range. If it does not exceed this range, the system determines that the weight on bit is stable. If it exceeds this range, the system determines that the weight on bit is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is carried out; The measured rotary table speed collected is the average of the measured rotary table speed at n time points = (RPM1 + RPM2 + RPM3 +..... + RPMn) / n. Set the stable rotary table speed range, and compare the collected rotary table speed with the set stable rotary table speed range. If it does not exceed this range, the system determines that the rotary table speed is stable. If it exceeds this range, the system determines that the rotary table speed is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is carried out; The measured inlet flow rate collected is the average of the measured inlet flow rate at n time points = (inlet flow rate 1 + inlet flow rate 2 + inlet flow rate 3 +..... + inlet flow rate n) / n. Set the stable inlet flow rate range. If it does not exceed this range, the system determines that the inlet flow rate is stable. If it exceeds this range, the system determines that the inlet flow rate is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is carried out; The measured rate of penetration collected is the average of the measured rate of penetration at n time points = (ROP1 + ROP2 + ROP3 +..... + ROPn) / n. Set the stable rate of penetration range. If it does not exceed this range, the system determines that the rate of penetration is stable. If it exceeds this range, the system determines that the rate of penetration has accelerated or slowed down, and it is possible to drill into a new formation, indicating that there may be an overflow or lost circulation. The system issues a pre-alarm; Set the alarm limit value for the cumulative overflow volume or lost circulation volume in the alarm parameters, and issue an alarm when the limit value is exceeded.

[0043] In some improved technical solutions, the alarm limit values for the cumulative overflow volume or leakage volume set in the alarm parameters include a first-level alarm limit value and a second-level alarm limit value. When the first-level alarm limit value is exceeded, a first-level alarm is issued; when the second-level alarm limit value is exceeded, a second-level alarm is issued to confirm that overflow or leakage has occurred, and the well team is required to immediately shut in the well.

[0044] Embodiment 2

[0045] As shown in the attached Figure 2 figure, for the conventional drilling overflow and leakage monitoring, the adopted overflow and leakage monitoring and alarm system includes: an overflow and leakage monitoring skid 1, a data acquisition device 2, an overflow and leakage monitoring device 3, and an alarm device 4;

[0046] A mass flowmeter 11 is provided on the overflow and leakage monitoring skid 1;

[0047] The data acquisition device 2 includes a PLC 21 and a logging industrial computer 22. The mass flowmeter 11 is connected to the PLC 21. The PLC 21 and the logging industrial computer 22 collect drilling parameters in real time and transmit the collected drilling parameters to the database 31 of the overflow and leakage monitoring device 3. The drilling parameters collected by the PLC 21 include inlet flow rate, outlet flow rate, riser pressure, outlet pressure, and mud tank liquid level. The drilling parameters collected by the logging industrial computer 22 include hook load, drilling time, rotary table speed, total hydrocarbon of gas logging, well depth, and bit depth;

[0048] A data input module 32 is provided in the overflow and leakage monitoring device 3. The parameters input by the data input module 32 are stored in the database 31. The input parameters include early warning parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure, and stroke length. The database 31 feeds back the parameters input by the data input module 32 and the drilling parameters collected in real time by the PLC 21 and the logging industrial computer 22 to the digital display module 33, the graphic display module 34, and the data processing module 35 provided in the overflow and leakage monitoring device 3. After being processed by the data processing module 35, it is fed back to the alarm device 4;

[0049] The alarm device 4 receives the instructions sent by the overflow and leakage monitoring device 3 and executes the alarm. The alarm device 4 includes a driller display alarm 41, a supervisor display alarm 42, and an engineer display alarm 43, and all three are connected to the data processing module 35 through a network cable.

[0050] In this structure, the mass flowmeter 11 is connected to the PLC 21 through a network cable, and transmits the collected information to the PLC 21. The PLC 21, the mud logging industrial control computer 22, and the data input module 32 are respectively connected to the database 31 of the overflow and loss monitoring device 3 through network cables. The data processing module 35 is connected to the alarm device 4 through a network cable. The database 31 of the overflow and loss monitoring device 3 is respectively connected to the digital display module 33, the graphic display module 34, and the data processing module 35 of the overflow and loss monitoring device 3 through data lines.

[0051] Among them, the overflow and loss monitoring skid 1 includes a return mud pipe 12, a first branch pipe 13, a second branch pipe 14, a third branch pipe 15, and a tee 16. The first branch pipe 13 and the second branch pipe 14 are respectively connected to the return mud pipe 12. The tee 16 is respectively connected to the first branch pipe 13, the second branch pipe 14, and the third branch pipe 15. A control pressure pipe connection port 151 and a kill pipe connection port 152 are respectively arranged on the third branch pipe 15. A first valve 121 is arranged on the return mud pipe 12 between the connection port of the first branch pipe 13 and the connection port of the second branch pipe 14. A second valve 131 is arranged on the first branch pipe 13. A third valve 141 is arranged on the second branch pipe 14. A fourth valve 153 is arranged at the control pressure pipe connection port 151. A fifth valve 154 is arranged at the kill pipe connection port 152. The mass flowmeter 11 is arranged on the second branch pipe 14. The inlet of the return mud pipe 12 is connected to an anti-overflow pipe, and the outlet is connected to a mud tank. A rotating control head 17 is connected to the inlet of the return mud pipe 12, and the rotating control head 17 is connected to the overflow pipe. A sixth valve 122 is arranged at the inlet of the return mud pipe 12, and a seventh valve 123 is arranged on the control pressure throttle pipe.

[0052] During the underbalanced well monitoring process, the sixth valve 122, the first valve 121, the second valve 131, and the fourth valve 153 are closed, and the seventh valve 123, the fourth valve 153, and the third valve 141 are opened. The returned mud enters the mass flowmeter 11 of the overflow and loss monitoring skid 1 through the rotating control head 17 and the control pressure throttle manifold, then returns to the return mud pipe 12, flows into the mud return trough and then into the mud tank. By passing through the overflow and loss monitoring skid 1, the outlet flow rate and outlet pressure of the returned mud are obtained, thereby realizing the overflow and loss monitoring.

[0053] The principle and process of the overflow and loss monitoring of this system are as follows:

[0054] (1) Data acquisition step: Collect the parameters of the mass flowmeter 11 and the drilling parameters (inlet flow rate, outlet flow rate, riser pressure, outlet pressure, mud tank liquid level) collected by the PLC 21 in the data acquisition device 2, and the drilling parameters (drilling pressure, drilling time, rotary table speed, gas logging total hydrocarbon, well depth, and bit depth) collected by the mud logging industrial control computer 22.

[0055] (2) Parameter setting steps: Store the parameters (pre-alarm parameters, alarm parameters, mud pump liner size, drill string parameters, wellbore structure, and stroke length) input by the data input module 32 into the database 31 of the overflow and leakage monitoring device 3.

[0056] (3) Calculation, comparison, decision-making, pre-alarm, and alarm steps: Calculate the difference between the inlet and outlet flow rates using the difference between the inlet flow rate and the outlet flow rate, and display the data and curve graphics. When the weight on bit, rotary table speed, and inlet flow rate are set to be constant in the alarm parameter settings, if the rate of penetration changes, it indicates that the formation lithology has changed, and it is possible to drill into an overflow or leakage formation, and a pre-alarm for overflow or leakage is issued. The calculation formula for the inlet flow rate = 3 × 3.14 × D 2 / 4 × L × V × Q, where D is the diameter of the mud pump liner; L is the stroke length; V is the pump speed; Q is the pump efficiency; the difference between the inlet and outlet flow rates = outlet flow rate - inlet flow rate, where when the difference between the inlet and outlet flow rates is positive, it is an overflow, and when it is negative, it is a leakage; When a positive value is obtained, it is the overflow volume, and when a negative value is obtained, it is the leakage volume. i is the time point, in seconds, and must be greater than 1 and an integer. n is the time period and is an integer; the measured weight on bit collected is the average value of the measured weight on bit at n time points = (WOB1 + WOB2 + WOB3 +..... + WOBn) / n. Set the stable weight on bit range, and compare the collected weight on bit with the set stable weight on bit range. If it does not exceed this range, the system determines that the weight on bit is stable. If it exceeds this range, the system determines that the weight on bit is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is made; the measured rotary table speed collected is the average value of the measured rotary table speed at n time points = (RPM1 + RPM2 + RPM3 +..... + RPMn) / n. Set the stable rotary table speed range, and compare the collected rotary table speed with the set stable rotary table speed range. If it does not exceed this range, the system determines that the rotary table speed is stable. If it exceeds this range, the system determines that the rotary table speed is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is made; the measured inlet flow rate collected is the average value of the measured inlet flow rate at n time points = (inlet flow rate 1 + inlet flow rate 2 + inlet flow rate 3 +..... + inlet flow rate n) / n. Set the stable inlet flow rate range. If it does not exceed this range, the system determines that the inlet flow rate is stable. If it exceeds this range, the system determines that the inlet flow rate is unstable and cannot be used as a judgment basis, that is, no decision-making alarm is made; the measured rate of penetration collected is the average value of the measured rate of penetration at n time points = (ROP1 + ROP2 + ROP3 +..... + ROPn) / n. Set the stable rate of penetration range. If it does not exceed this range, the system determines that the rate of penetration is stable. If it exceeds this range, the system determines that the rate of penetration has accelerated or slowed down, and it is possible to drill into a new formation, indicating that there may be an overflow or leakage. The system issues a pre-alarm; set the alarm limit value for the cumulative overflow volume or leakage volume in the alarm parameters, and issue an alarm when the limit value is exceeded.

[0057] In some improved technical solutions, the alarm limit values for the cumulative overflow volume or leakage volume set in the alarm parameters include a primary alarm limit value and a secondary alarm limit value. When the primary alarm limit value is exceeded, a primary alarm is issued; when the secondary alarm limit value is exceeded, a secondary alarm is issued to confirm that overflow or leakage has occurred, and the well team is required to immediately shut in the well.

[0058] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0059] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An overflow and leakage monitoring alarm system, characterized in that: include: Overflow and leakage monitoring skid, data acquisition device, overflow and leakage monitoring device and alarm device; The overflow and leakage monitoring skid is provided with a mass flow meter; The data acquisition device includes a PLC and a logging industrial computer, the mass flow meter is connected to the PLC, the PLC and the logging industrial computer collect drilling parameters in real time, and transmit the collected parameters to the database of the overflow and leakage monitoring device; The overflow and leakage monitoring device is provided with a data input module, and the parameters input by the data input module are stored in a database, and the database feeds back the parameters input by the data input module and the drilling parameters collected in real time by the PLC and the logging industrial computer to the digital display module, the graphic display module and the data processing module provided in the overflow and leakage monitoring device, and then the data processing module feeds back the parameters to the alarm device after processing. The alarm device receives the instruction sent by the overflow and leakage monitoring device and executes the alarm.

2. The overflow and leakage monitoring alarm system according to claim 1 is characterized in that: The mass flow meter is connected to the PLC via a network cable, the PLC, the logging industrial computer, and the data input module are respectively connected to the database of the overflow and leakage monitoring device via the network cable, the data processing module is connected to the alarm device via the network cable, and the database of the overflow and leakage monitoring device is respectively connected to the digital display module, the graphic display module, and the data processing module of the overflow and leakage monitoring device via the data cable.

3. The overflow and leakage monitoring alarm system according to claim 1 is characterized in that: The overflow and leakage monitoring skid includes a return pipe, branch pipe one, branch pipe two, branch pipe three and a tee. The branch pipe one and branch pipe two are respectively connected to the return pipe, and the tee is respectively connected to branch pipe one, branch pipe two and branch pipe three; the branch pipe three is respectively provided with a pressure control pipe connecting port and a well-killing pipe connecting port; the return pipe is provided with a valve one between the branch pipe one connecting port and the branch pipe two connecting port, the branch pipe one is provided with a valve two, the branch pipe two is provided with a valve three, the pressure control pipe connecting port is provided with a valve four, and the well-killing pipe connecting port is provided with a valve five; the mass flow meter is provided on the branch pipe two.

4. The overflow and leakage monitoring alarm system according to claim 3 is characterized in that: The inlet of the return slurry pipe is connected to the anti-overflow pipe, and the outlet is connected to the mud tank.

5. The overflow and leakage monitoring alarm system according to claim 4 is characterized in that: The inlet of the return slurry pipe is connected with a rotating control head, the rotating control head is connected with the overflow pipe, and the inlet of the return slurry pipe is provided with a valve six.

6. The overflow and leakage monitoring alarm system according to claim 1 is characterized in that: The drilling parameters collected by the PLC include inlet flow, outlet flow, standpipe pressure, outlet pressure, and mud tank level; the drilling parameters collected by the logging industrial computer include drilling pressure, drilling time, drill speed, gas logging total hydrocarbons, well depth, and drill bit depth.

7. The overflow and leakage monitoring alarm system according to claim 1 is characterized in that: The parameters input by the data input module include early warning parameters, alarm parameters, mud pump cylinder sleeve size, drilling tool parameters, wellbore structure and stroke length.

8. The overflow and leakage monitoring alarm system according to claim 1 is characterized in that: The alarm device includes a driller display alarm, a supervisor display alarm and an engineer display alarm, all of which are connected to the data processing module via a network cable.

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