CN109751045B - Overflow lost circulation monitoring method and device - Google Patents
Overflow lost circulation monitoring method and device Download PDFInfo
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Abstract
The invention discloses an overflow lost circulation monitoring method and device, and relates to a well in the technical field of petroleum exploration, development and drilling engineering. It can discover early overflow and lost circulation fast and accurately. The system comprises a drilling outlet flow monitoring unit and a drilling inlet flow monitoring unit. The inlet flow monitoring unit comprises an electromagnetic flowmeter; the outlet flow monitoring unit comprises a flowmeter short-circuit unit and a buffer tank. The flowmeter short-circuit unit comprises a main pipe, a left branch pipe and a right branch pipe, wherein the left branch pipe and the right branch pipe are respectively communicated with the main pipe; the left branch pipe and the right branch pipe are respectively provided with a coriolis force flowmeter, and the main pipe is provided with a main pneumatic knife gate valve; one end of a main pipe of the flowmeter short-circuit unit is connected with a buffer groove through a flange, the other end of the flowmeter short-circuit unit is hung below the drilling platform through a steel wire rope and is connected with a wellhead drainage tube through a hose, and the buffer groove is arranged on a buffer groove of a vibrating screen for drilling.
Description
Technical Field
The invention belongs to the technical field of petroleum exploration, development and drilling engineering, and particularly relates to a method and a device for monitoring kick and lost circulation.
Background
The well kick and the well leakage are serious and common underground complex conditions in the well drilling, and if the well kick and the well leakage are not found timely, the well kick and the well leakage can be caused even more serious accidents, so that the well kick and the well leakage are found timely and are particularly important in early stage, and the well kick and the well leakage are found on the domestic well drilling site at present, and whether overflow and well leakage occur or not is judged by monitoring the total volume of a mud pool and the change of relative flow.
The current detection method has the following disadvantages.
The internal space cross section of the conventional mud tank is about 20m & lt/EN & gt, when the overflow or lost circulation quantity is less than 1m & lt/EN & gt, the liquid level of the 4 mud tanks is less than 1cm, and the error of the liquid level monitoring device of the mud tank is about 1cm, so that the overflow and lost circulation quantity less than 1m can not be accurately monitored. The overflow and lost circulation are judged by the total pool volume and the relative flow parameters, and the method is rough and lagged, so that the interference caused by the bubbles contained in the slurry is difficult to eliminate.
Disclosure of Invention
The invention provides an overflow lost circulation monitoring method and device, which can quickly and accurately discover early overflow and lost circulation.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
An overflow lost circulation monitoring device comprises a drilling outlet flow monitoring unit and a drilling inlet flow monitoring unit.
The inlet flow monitoring unit comprises an electromagnetic flowmeter for detecting flow in a water line on a drilling well.
The outlet flow monitoring unit comprises a flowmeter short-circuit unit and a buffer tank.
The flowmeter short-circuit unit comprises a main pipe, a left branch pipe and a right branch pipe, wherein the left branch pipe and the right branch pipe are respectively communicated with the main pipe; the left branch pipe and the right branch pipe are respectively provided with a coriolis force flowmeter, and the main pipe is provided with a main pneumatic knife gate valve; one end of a main pipe of the flowmeter short-circuit unit is connected with the buffer groove through a flange, the other end of the flowmeter short-circuit unit is hung below the drilling platform through a steel wire rope, is connected with a wellhead drainage tube through a hose, and is clamped and sealed by a metal clip; the buffer tank is arranged on the buffer tank of the vibrating screen for drilling.
As a preferable scheme of the invention, the left branch pipe and the right branch pipe are oppositely arranged, the left branch pipe is distributed on one side of the main pipe, and the right branch pipe is distributed on the other side of the main pipe; the connection parts of the two ends of the left branch pipe and the main pipe are respectively provided with a pneumatic knife gate valve, and the connection parts of the two ends of the right branch pipe and the main pipe are respectively provided with a pneumatic knife gate valve.
As another preferable scheme of the invention, the left branch pipe and the right branch pipe are the same in shape and are in a shape of a Chinese character , and the two -shaped structures are arranged opposite to each other and connected with the main pipe to form a Chinese character 'zhong' shaped structure.
As another preferable scheme of the invention, the buffer tank (the buffer tank of the non-vibrating screen) is a rectangular box body, and a seamless steel pipe interface is arranged at the middle lower part of the front end of the rectangular box body and used for connecting a main pipe; the bottom surface of the rear end of the rectangular box body is provided with a slurry discharging port or a slurry discharging pipe.
As another preferable scheme of the invention, the cross sections of the slurry discharging port and the slurry discharging pipe are round, rectangular or triangular, and the sizes of the slurry discharging port and the slurry discharging pipe can ensure that the slurry with the sand slurry in the box body can be normally discharged.
As another preferable scheme of the invention, the coriolis force flowmeter and the electromagnetic flowmeter are respectively connected with a PC serial port through an RS 485-to-RS 232 serial port conversion module, the pneumatic knife gate valve is connected with an air source through an air pipeline, and the air pipeline is also provided with a pneumatic linkage and an electromagnetic valve.
A method for monitoring overflow lost circulation comprises the following steps.
And 1, monitoring the outlet instantaneous flow and calculating the accumulated outlet volume flow.
Monitoring the instantaneous slurry quantity returned from the outlet through a flowmeter to obtain output instantaneous mass flow Mflowout, density Mdoa and temperature parameters; calculating to obtain an instantaneous outlet volume flow Vlow; when two coriolis force flow meters are used, the instantaneous outlet volumetric flow is the sum of the instantaneous volumetric flows of the two flow meters.
Vflowout＝Mflowout /Mdoa。
Calculating in real time a cumulative outlet volume flow G Vfrequency, the cumulative outlet volume flow being equal to the current cumulative outlet volume flow G t Vflowout and instantaneous outlet volumetric flow.
G Vflowout=G t Vflowout+ Vflowout。
And 2, monitoring the inlet instantaneous flow and calculating the accumulated inlet volume flow.
The method comprises the steps of monitoring the amount of pumped instant slurry in real time through an electromagnetic flowmeter arranged on a water supply pipeline of a slurry pump, and obtaining instant inlet volume flow Vvlowin, wherein when three slurry pumps are drilled, the inlet volume flow is the sum of the instant flow of the electromagnetic flowmeters arranged on the three slurry pumps.
The cumulative inlet volume flow G Vvlowin is equal to the current cumulative outlet volume flow G t Vvlowin and instantaneous inlet volumetric flow.
G Vflowin= Vflowin+ G t Vflowin。
And 3, calculating an early warning value and triggering early warning.
And (5) in early warning value calculation.
The early warning value adopts a difference RTFD of instantaneous volume flow of the outlet and the inlet.
RTFD= Vflowout-Vflowin。
And setting a flow difference early warning threshold, and when the flow difference RTFD is more than 0.5L/s or RTFD is less than 0.5L/s, starting to calculate the overflow/leakage slurry volume change CTV and the continuous early warning Time Time.
And starting to record the duration early warning Time in real Time.
The base difference BD is calculated by the difference between the cumulative outlet volume flow G Vflowout and the cumulative inlet volume flow G Vflowin.
The calculation of the volume change CTV of the overflowed/lost mud is started.
CTV=G Vflowout-G Vflowin-BD。
The speed rate of overflow/leak starts to be calculated.
Speed rate= CTV/Time。
And (3) early warning triggering: and judging three parameters of the flow difference RTFD, the overflow/leakage slurry volume CTV and the continuous early warning Time Time.
If: -0.5L/s < RTFD <0.5L/s and-0.2 m3<CTV<0.2 m3 and Time <180 s, no alarm is activated.
If: RTFD >0.5L/s or RTFD < -0.5L/s, CTV <0.2 m3, time <180 s and RTFD alarm is activated.
If: RTFD >0.5L/s, CTV >0.2 m3, and Time <180 s then RTFD and CTV alarms are activated.
If: RTFD < -0.5L/s, CTV < -0.2 m3, time <180 s, RTFD and CTV alarm are activated.
If: RTFD >0.5L/s, CTV <0.2 m3, time >180s RTFD, time alarm is activated.
If: RTFD < -0.5L/s, CTV <0.2 m3, time >180s, RTFD, time alarm is activated.
If RTFD >0.5L/s and CTV <0.2 m3;Time>180 s then RTFD, CTV, time alarm is activated.
If RTFD < -0.5L/s, CTV < -0.2 m3, time >180s then RTFD, CTV, time alarm is activated.
Compared with the prior art, the invention has the beneficial effects.
1. The real-time quantitative monitoring of the outlet flow and the inlet flow of the well drilling is realized.
2. The early-stage kick and lost circulation can be identified rapidly and accurately.
3. The overflow leakage and speed can be calculated rapidly and accurately, so that the drilling technician can evaluate the overflow leakage degree conveniently and take corresponding measures.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
FIG. 1 is a schematic side view of the overall installation of the overflow lost circulation monitoring device of the present invention.
Fig. 2 is a schematic top view of a shorting unit of the flowmeter of the present invention.
FIG. 3 is a schematic diagram of a buffer tank according to the present invention.
Fig. 4 is a schematic view of the inside of the control box of the present invention.
FIG. 5 is a schematic diagram of a verification test of the present invention.
FIG. 6 is an overflow/lost circulation monitoring flow path of the present invention.
In the figure, a conduit group is 1, a pneumatic knife gate valve is 2, a coriolis force flowmeter is 3, an electromagnetic flowmeter is 4, a slurry pump is 5, a buffer tank is 6, a control box is 7, a flange is 8, a wellhead drainage tube is 9, a hose is 10, a vibration sieve buffer tank is 11, a slurry tank is 12, a seamless elbow is 14, a rectangular slurry discharge port is 16, a seamless steel pipe with a length of 17 meters is 18, an explosion proof box is 19, a wiring row is 20, a two-position three-way electromagnetic valve is 20, a pneumatic duplex member is 21, a gas pipeline is 22, a gas pipeline is fast inserted, a relay is 24, a board through joint is 25, a net wire interface is 26, an explosion proof aviation plug is 27, and a gas source interface is 28.
Detailed Description
As shown in fig. 1-6, as a specific embodiment of the present invention, on the premise of ensuring safety and stability after multiple field tests, the installation cost is reduced, and finally, the preferred equipment specification and assembly mode are as follows.
An overflow lost circulation monitoring device comprising: drilling outlet flow monitoring devices and inlet flow monitoring devices.
1. The drilling outlet flow monitoring device comprises a flow monitoring device.
(1) The flow monitoring device consists of a conduit group, a flowmeter short-circuit unit and a buffer tank.
(1) A catheter group: the connecting device is used for connecting the flowmeter short-circuit unit and the buffer unit with each other and with the outside. As shown in fig. 1, the flange is formed by connecting a plurality of sections of seamless steel pipes by flanges, and a flange of DN300 national standard PN1.6Mpa is selected; the size of the seamless steel pipe is also referred to the original pipe size of the well team, and the wall thickness is usually selected to be 12mm; a seamless steel pipe with an outer diameter of 325 mm.
(2) Flowmeter short circuit unit: the flowmeter short-circuit unit comprises a main pipe, a left branch pipe and a right branch pipe, wherein the left branch pipe and the right branch pipe are respectively communicated with the main pipe; the left branch pipe and the right branch pipe are respectively provided with a coriolis force flowmeter, and the main pipe is provided with a main pneumatic knife gate valve; one end of a main pipe of the flowmeter short-circuit unit is connected with the buffer groove through a flange, the other end of the flowmeter short-circuit unit is hung below the drilling platform through a steel wire rope and is connected with a wellhead drainage tube through a hose, and the wellhead drainage tube is clamped and sealed through a metal clamp; the buffer groove is arranged on the buffer groove of the vibrating screen above the mud tank. The mud pump is communicated with the side lower part of the mud tank through a pipeline; an electromagnetic flowmeter is arranged on the pipeline.
As shown in FIG. 2, two coriolis force flowmeters with the caliber DN250 are selected (an inner measuring tube is two parallel micro bent tubes with the caliber of 80 mm), DN250 and 90 DEG seamless elbows with the material of 316L are selected, national standard DN250 flanges with the bearing pressure of 1.6Mpa are welded at the two ends, the welded 90 DEG elbows and the flowmeters (with DN250 flanges) are connected in a flange mode, a section of DN300 seamless steel tube with the same material as a conduit group is selected, national standard DN300 flanges with the bearing pressure of 1.6Mpa are welded at the two ends of the steel tube, the lengths of the flowmeters corresponding to the connected elbows are correspondingly selected, two welded junctions are respectively arranged on the pipe walls at the two ends of a symmetrical surface of the steel tube, then DN250 seamless steel tubes with the length of 0.4m are respectively welded at one ends of the four welded junctions, and the two flowmeters connected with the two flowmeters with the elbows are connected to the two sides of the steel tube in a flange connection mode, so as to form a flowmeter shorting unit.
(3) Buffer tank: as shown in fig. 3, a rectangular box body formed by welding several groups of thick steel plates, wherein the thickness of the steel plates is 8mm, a seamless steel pipe with the length of 1 meter is welded at the middle lower part of the front end of the rectangular box body, the size of the seamless steel pipe is also referred to the original pipe size of a well team, and the wall thickness is usually selected to be 12mm; a seamless steel pipe with the outer diameter of 325mm is welded with a flange of DN300 national standard PN1.6Mpa at the front end of the steel pipe; rectangular slurry discharge openings (the size is required to ensure that the slurry with the sand slurry in the box body can be normally discharged) are welded on the bottom surface of the rear box bottom.
(2) (1) pneumatic knife gate valve: as shown in FIG. 2, 1 PZH673-10P pneumatic knife gate valve (main pneumatic knife gate valve) with the caliber of DN300 is selected, and 4 PZH673-10P pneumatic knife gate valves 12 with the caliber of DN250 are selected.
(2) Control box for placing control device: the control box is used for pneumatic control intermediation and signal transmission intermediation, as shown in fig. 4, the control box is a stainless steel flameproof box, and a wiring row, a relay, an electromagnetic valve (pneumatic knife gate valve), a pneumatic duplex member, an air pipeline and an air pipeline are fixed in the box for quick insertion. The left side wall and the lower side wall of the box body are respectively provided with an explosion-proof penetrating board connector and an explosion-proof aviation plug. The wiring row, the relay and the solenoid valve wiring terminal are connected by a signal wire according to a correct connection method; (Relay control solenoid valve is a common means in the art, and a person skilled in the art can know the implementation method from public channels, and details are not added here.) pneumatic duplex pieces, gas pipeline quick-plug and board-penetrating connectors are connected by gas pipelines; the UPS of the comprehensive logging house takes 220V stable voltage, outputs DC 24V power through a switching power supply, and supplies the power to a control box through a power line, and the control box outputs two groups of DC 24V power through a wiring row in the box to supply power to two flowmeters respectively; the 485 signal output by the flowmeter is connected to the aviation plug of the control box through a signal wire, then connected to an indoor 485-232 serial port module through a connecting signal wire, and the module is connected to a serial port of a computer so as to display flow parameters; the explosion-proof board-penetrating connector at the lower part of the box body is connected with an on-site air source (entering from an air source connector), and 3 groups of explosion-proof board-penetrating connectors at the left side wall of the box body are connected with pneumatic knife gate valves of the pipeline of the overflow well leakage monitoring device.
2. Inlet flow monitoring means.
Inlet flow monitoring device: as shown in fig. 1, an electromagnetic flowmeter according to faraday principle is selected, the size of the electromagnetic flowmeter is selected to be matched with the size of a water supply pipeline of a drilling mud pump, and when drilling mud is installed, the electromagnetic flowmeter is installed on the water supply pipeline of the drilling mud pump in series (a plurality of pumps are installed in drilling).
The actual operation is as follows:
as shown in fig. 2, according to the embodiment steps, the flowmeter shorting unit is connected, the front and the back of the flowmeter shorting unit are connected with the guide pipe by using flange, then the buffer tank straight pipe flange (shown in fig. 3) is connected with the flange at the rear side of the flow connecting shorting unit (shown in fig. 2), then the control box is fixed on the side surface of the buffer tank (shown in fig. 1), then the pneumatic valve air source interfaces are connected with the output air source interfaces of the control box in a one-to-one correspondence manner, and then the mass flowmeter is connected with the control box by using signal wires; the entire connected device is installed between the wellhead and the shaker in place of the drilling outlet conduit.
As shown in fig. 1, an electromagnetic flowmeter is mounted on a pump water supply line; connecting the flowmeter and the control box to a PC computer through a signal wire and a network cable (network cable interface); the computer controls the pneumatic valve to switch; by the monitoring method, overflow and lost circulation are automatically monitored. The use of a flow monitoring device in the field requires a calibration check procedure before monitoring, which is done to ensure that the coriolis force flowmeter measurements are correct, while measuring the maximum flow through the sensor to avoid overflowing the wellhead. (Note: during testing, one needs to always check the wellhead mud level at the rig floor, slowly increase the displacement to the point that the wellhead mud level rises to the point that a warning is requested at 0.5 meters from the drain opening).
As shown in fig. 5, the checking operation is tuned.
1-stop the mud pump.
2-opening a valve bypass pneumatic valve (i.e., coriolis force flowmeter circuit) in the flow monitoring device line.
3-closing the straight-through pneumatic valve.
4-starting the pump, increasing the discharge capacity to 10L/s, and waiting for the stability of the slurry returned from the diversion channel in the vibrating screen room.
5-once the logging confirms the mud displacement, continuing to increase the displacement to 20L/s, and simultaneously observing the stability of the mud returned from the shunt tank in the vibrating screen room.
6-once the logging confirms the mud discharge, the discharge is continuously increased to 30L/s, and meanwhile, the stability of the mud returned out of the diversion groove in the vibrating screen room is observed.
7-once the logging confirms the mud displacement, slowly increasing the displacement to 40L/s, and simultaneously observing the stability of the wellhead mud liquid level and the mud returned out of the diversion groove in the vibrating screen room.
8-once the logging confirms the mud discharge capacity, slowly increasing the discharge capacity to 50L/s, and simultaneously observing the stability of the wellhead mud liquid level and the mud returned out of the diversion groove in the vibrating screen room.
9-once the logging confirms the mud displacement, slowly increasing the displacement to 60L/s, and simultaneously observing the stability of the wellhead mud liquid level and the mud returned out of the diversion groove in the vibrating screen room.
10-once the logging confirms the mud displacement, the displacement is slowly increased to 1.5 meters above the rig floor surface, which is the maximum displacement allowed by flowman.
11-once the logging confirms maximum displacement, the displacement is reduced to 55L/s, waiting for the return mud in the shaker house to drain steadily.
12-once the logging confirms the displacement, the displacement is reduced to 45L/s, and the returned mud in the vibrating screen room is waited for stable discharge.
13-once the logging confirms the displacement, the displacement is reduced to 35L/s, and the returned mud in the vibrating screen room is waited for stable discharge.
14-once the logging confirms the displacement, the displacement is reduced to 25L/s, and the returned mud in the vibrating screen room is waited for stable discharge.
15-once the logging confirms the displacement, the displacement is reduced to 15L/s, and the returned mud in the vibrating screen room is waited for stable discharge.
16-once the logging confirms the displacement, the mud pump is stopped.
And 17-starting the pump, setting the displacement to the drilling displacement, stopping the pump after the displacement is stable, and waiting for the return quantity to be zero.
And 18-starting the pump, setting the displacement to the drilling displacement, and after the displacement is stable, simulating the well kick to pump a little mud into the return pipeline.
19-open straight-through line pneumatic gate valve.
Note that: the low-displacement circulation can be measured by adopting a single-path flowmeter firstly, and as the displacement rises, once the wellhead slurry liquid level rises to 0.5 meter away from the opening of the drainage tube (the maximum displacement which can be measured by the single-path flowmeter can be determined in this way), the other path flowmeter is opened, and a double-flow-path measurement mode is adopted.
An overflow lost circulation monitoring method comprising: and monitoring the instantaneous flow of the outlet, calculating the accumulated outlet volume flow, monitoring the instantaneous flow of the inlet, calculating the accumulated inlet flow, calculating an early warning value and triggering early warning.
Step 1, monitoring outlet instantaneous flow and calculating accumulated outlet volume flow;
monitoring the instantaneous slurry quantity returned from the outlet through a flowmeter to obtain output instantaneous mass flow Mflowout, density Mdoa and temperature parameters; calculating to obtain an instantaneous outlet volume flow Vlow; when two coriolis force flow meters are used, (the coriolis force flow meters have extremely high measurement accuracy for gas-liquid-solid three-phase flow, are not only suitable for water-based drilling fluid, but also have high accuracy for oil-based drilling fluid measurement), and the instantaneous outlet volume flow is the sum of the instantaneous volume flows of the two flow meters.
Vflowout＝Mflowout /Mdoa。
Calculating in real time a cumulative outlet volume flow G Vfrequency, the cumulative outlet volume flow being equal to the current cumulative outlet volume flow G t Vflowout and instantaneous outlet volumetric flow.
G Vflowout=G t Vflowout+ Vflowout。
And 2, monitoring the inlet instantaneous flow and calculating the accumulated inlet volume flow.
Through the electromagnetic flowmeter installed on the water supply pipeline of the slurry pump, (the measurement precision of the liquid-solid two-phase flow is high, the price is lower than that of the mass flowmeter), the pumping instant slurry amount is monitored in real time, the instant inlet volume flow Vflow is obtained, and when three slurry pumps are drilled, the inlet volume flow is the sum of the instant flow of the electromagnetic flowmeter installed by the three slurry pumps.
The cumulative inlet volume flow G Vvlowin is equal to the current cumulative outlet volume flow G t Vvlowin and instantaneous inlet volumetric flow.
G Vflowin= Vflowin+ G t Vflowin。
And 3, calculating an early warning value and triggering early warning.
And (5) in early warning value calculation.
The early warning value adopts a difference RTFD of instantaneous volume flow of an outlet and an inlet: specifically calculated as follows.
RTFD= Vflowout-Vflowin
And setting a flow difference early warning threshold, and when the flow difference RTFD is more than 0.5L/s or RTFD is less than 0.5L/s, starting to calculate the overflow/leakage slurry volume change CTV and the continuous early warning Time Time.
And starting to record the duration early warning Time in real Time.
The base difference BD is calculated by the difference between the cumulative outlet volume flow G Vflowout and the cumulative inlet volume flow G Vflowin.
The calculation of the volume change CTV of the overflowed/lost mud is started.
CTV=G Vflowout-G Vflowin-BD
The speed rate of overflow/leak starts to be calculated.
Speed rate= CTV/Time
And (3) early warning triggering: and judging three parameters of the flow difference RTFD, the overflow/leakage slurry volume CTV and the continuous early warning Time Time.
If: -0.5L/s < RTFD <0.5L/s and-0.2 m3<CTV<0.2 m3 and Time <180 s, no alarm is activated.
If: RTFD >0.5L/s or RTFD < -0.5L/s, CTV <0.2 m3, time <180 s; the RTFD alarm is activated.
If: RTFD >0.5L/s, CTV >0.2 m3, and Time <180 s then RTFD and CTV alarms are activated.
If: RTFD < -0.5L/s, CTV < -0.2 m3, time <180 s, RTFD and CTV alarm are activated.
If: RTFD >0.5L/s, CTV <0.2 m3, time >180s RTFD, time alarm is activated.
If: RTFD < -0.5L/s, CTV <0.2 m3, time >180s, RTFD, time alarm is activated.
If RTFD >0.5L/s and CTV <0.2 m3;Time>180 s then RTFD, CTV, time alarm is activated.
If RTFD < -0.5L/s, CTV < -0.2 m3, time >180s then RTFD, CTV, time alarm is activated.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (6)
1. An overflow lost circulation monitoring method is characterized in that an overflow lost circulation monitoring device is used, and the overflow lost circulation monitoring device comprises a drilling outlet flow monitoring unit and a drilling inlet flow monitoring unit;
the inlet flow monitoring unit comprises an electromagnetic flowmeter, wherein the electromagnetic flowmeter is used for detecting the flow in a water supply pipeline of the drilling well;
the outlet flow monitoring unit comprises a flowmeter short-circuit unit and a buffer tank;
the flowmeter short-circuit unit comprises a main pipe, a left branch pipe and a right branch pipe, wherein the left branch pipe and the right branch pipe are respectively communicated with the main pipe; the left branch pipe and the right branch pipe are respectively provided with a coriolis force flowmeter, and the main pipe is provided with a main pneumatic knife gate valve; one end of a main pipe of the flowmeter short-circuit unit is connected with the buffer groove through a flange, the other end of the flowmeter short-circuit unit is hung below the drilling platform through a steel wire rope, is connected with a wellhead drainage tube through a hose, and is clamped and sealed by a metal clip; the buffer groove is arranged on the buffer groove of the vibrating screen for drilling;
the method comprises the following steps:
step 1, monitoring outlet instantaneous flow and calculating accumulated outlet volume flow:
monitoring the instantaneous slurry quantity returned from the outlet through a flowmeter to obtain output instantaneous mass flow Mflowout, density Mdoa and temperature parameters; calculating to obtain an instantaneous outlet volume flow Vlow; when two coriolis force flow meters are used, the instantaneous outlet volumetric flow is the sum of the instantaneous volumetric flows of the two flow meters;
Vflowout＝Mflowout /Mdoa；
calculating an accumulated outlet volume flow rate G Vfrequency out in real time, wherein the accumulated outlet volume flow rate is equal to the sum of the current accumulated outlet volume flow rate G t Vfrequency out and the instantaneous outlet volume flow rate;
G Vflowout=G t Vflowout+ Vflowout；
step 2, monitoring the inlet instantaneous flow and calculating the accumulated inlet volume flow:
the method comprises the steps of monitoring the amount of pumped instant slurry in real time through an electromagnetic flowmeter arranged on a water supply pipeline of a slurry pump, and obtaining instant inlet volume flow Vvlowin, wherein when three slurry pumps are drilled, the inlet volume flow is the sum of the instant flow of the electromagnetic flowmeters arranged on the three slurry pumps;
the cumulative inlet volume flow, gvflowin, is equal to the sum of the current cumulative outlet volume flow, gt Vflowin, and the instantaneous inlet volume flow:
G Vflowin= Vflowin+ G t Vflowin
step 3, calculating an early warning value and triggering early warning:
in the early warning value calculation:
the early warning value adopts a difference RTFD of instantaneous volume flow of an outlet and an inlet:
RTFD= Vflowout-Vflowin
setting a flow difference early warning threshold, and when the flow difference RTFD is more than 0.5L/s or RTFD is less than 0.5L/s, starting to calculate the slurry volume change CTV and the continuous early warning Time Time of overflow/leakage:
recording the duration early warning Time in real Time;
calculating a difference value between the accumulated outlet volume flow G Vvlowout and the accumulated inlet volume flow G Vvlowin to obtain a basic difference value BD;
the calculation of the volume change CTV of the overflowed/lost mud is started:
CTV=G Vflowout-G Vflowin-BD
the speed rate of overflow/leak starts to be calculated:
Speed rate= CTV/Time
and (3) early warning triggering: by judging three parameters of the flow difference value RTFD, the overflow/leakage slurry volume CTV and the continuous early warning Time Time,
if: -0.5L/s<RTFD<0.5L/s and-0.2. 0.2 m 3 <CTV<0.2 m 3 And Time<180s, no alarm is activated;
if: RTFD (room temperature vulcanization)>0.5L/s or RTFD<-0.5 L/s; CTV<0.2 m 3 ; Time<180s the RTFD alarm is activated;
if: RTFD (room temperature vulcanization)>0.5 L/s; CTV>0.2 m 3 ; Time<180s RTFD, CTV alarm is activated;
if: RTFD (room temperature vulcanization)<-0.5 L/s; CTV<-0.2 m 3 ; Time<180s RTFD, CTV alarm is activated;
if: RTFD (room temperature vulcanization)>0.5 L/s; CTV<0.2 m 3 ; Time>180s RTFD, time alarms are activated;
if: RTFD (room temperature vulcanization)<-0.5 L/s; CTV<0.2 m 3 ; Time>180s RTFD, time alarms are activated;
if RTFD>0.5 L/s; CTV<0.2 m 3 ;Time>180s RTFD, CTV, time alarm is activated;
if RTFD<-0.5 L/s; CTV<-0.2 m 3 ; Time>180s then RTFD, CTV, time alarm is activated.
2. The overflow lost circulation monitoring method of claim 1, wherein: the left branch pipe and the right branch pipe are oppositely arranged, the left branch pipe is distributed on one side of the main pipe, and the right branch pipe is distributed on the other side of the main pipe; the connection parts of the two ends of the left branch pipe and the main pipe are respectively provided with a pneumatic knife gate valve, and the connection parts of the two ends of the right branch pipe and the main pipe are respectively provided with a pneumatic knife gate valve.
3. The overflow lost circulation monitoring method of claim 2, wherein: the left branch pipe and the right branch pipe are identical in shape and are in a shape of a Chinese character , and the two Chinese character are arranged opposite to each other and connected with the main pipe to form a Chinese character 'zhong' shape structure.
4. The overflow lost circulation monitoring method of claim 1, wherein: the buffer tank is a rectangular box body, and a seamless steel pipe interface is arranged at the middle lower part of the front end of the rectangular box body and used for connecting a main pipe; the bottom surface of the rear end of the rectangular box body is provided with a slurry discharging port or a slurry discharging pipe.
5. The overflow lost circulation monitoring method of claim 4, wherein: the cross sections of the slurry discharging port and the slurry discharging pipe are round, rectangular or triangular, and the sizes of the slurry discharging port and the slurry discharging pipe can ensure that the slurry with the sand mud in the box body can be normally discharged.
6. The overflow lost circulation monitoring method of claim 1, wherein: the coriolis force flowmeter and the electromagnetic flowmeter are respectively connected with a PC serial port through an RS 485-RS 232 serial port conversion module, the pneumatic knife gate valve is connected with an air source through an air pipeline, and the air pipeline is also provided with a pneumatic duplex member and an electromagnetic valve.
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| CN112502695B (en) * | 2021-02-05 | 2021-06-04 | 西安海联石化科技有限公司 | Drilling liquid level and leakage monitoring method |
| CN116733396B (en) * | 2023-08-11 | 2023-10-31 | 四川奥达测控装置有限公司 | Drilling outlet flow monitoring and well control overflow and leakage early warning system and method |
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