CN111749633A - Continuous tripping and drilling overflow and leakage monitoring method - Google Patents

Continuous tripping and drilling overflow and leakage monitoring method Download PDF

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Publication number
CN111749633A
CN111749633A CN202010589068.3A CN202010589068A CN111749633A CN 111749633 A CN111749633 A CN 111749633A CN 202010589068 A CN202010589068 A CN 202010589068A CN 111749633 A CN111749633 A CN 111749633A
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overflow
leakage
drilling fluid
well
tripping
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CN111749633B (en
Inventor
李雷
何弦桀
段慕白
李枝林
魏强
万夫磊
邓虎
陈俊斌
范黎明
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention provides a continuous tripping and overflow leakage monitoring method, which comprises the following steps: acquiring the real-time well outlet/inlet volume of a drill column; under the condition of obtaining the real-time output volume of the drill column, adjusting the real-time discharge volume of the drilling fluid injected into the well according to the real-time output volume of the drill column; judging whether overflow leakage occurs once every preset time interval, calculating the overflow leakage amount in the drill-tripping/drill-tripping process in the preset time under the condition of overflow leakage, and judging the overflow leakage grade in the drill-tripping/drill-tripping process; sending out a grading alarm according to the overflow and leakage grade of the drill tripping/drilling down process; the above process is repeated. The method has the advantages of realizing automatic monitoring of the continuous tripping drilling and the overflow leakage, improving the accuracy of the overflow leakage judgment and the like.

Description

Continuous tripping and drilling overflow and leakage monitoring method
Technical Field
The invention belongs to the technical field of oil and gas field drilling overflow and leakage monitoring methods, and particularly relates to a continuous tripping and running overflow and leakage monitoring method.
Background
Flooding is the phenomenon whereby formation fluid is forced into the well by the formation pressure when the formation pressure being drilled is greater than the drilling fluid column pressure in the well, and is referred to as flooding. The severity of the flooding depends primarily on the porosity, permeability, and magnitude of the differential negative pressure of the formation. The higher the porosity and permeability of the formation, the larger the negative pressure difference, and the more severe the flooding. Flooding occurs for a number of reasons, the most fundamental of which is the loss of well pressure balance, the pressure in the well being less than the formation pressure.
The causes of leakage can be divided into two main categories: one is artificial leakage path, which is the fracture leakage induced in the formation around the borehole due to the fact that the borehole pressure is higher than the formation bearing capacity (formation fracture pressure); another is natural channel leakage. During make-up, simple drilling operations such as tripping or active drilling cause fluctuations in the Equivalent Circulating Density (ECD) of the mud, which require relatively high pressures to overcome the drilling fluid static shear. Particularly when even small movements of the drilling tool in high shear drilling fluids cause severe fluctuating pressures. During normal construction, a bottom hole pressure jump can be observed due to sudden plugging of the wellbore, in which case the drilling process is immediately stopped, slowing the cycle to reduce the equivalent drilling fluid pressure (EMW), but not much due to plugging of the wellbore annulus. The strength of the reservoir limits the upper pressure of the safety window. Lost circulation occurs because the bottom hole pressure exceeds the formation fracture pressure when the pump is turned on again due to plugging. It is possible that the active drilling tool will release part of the pressure and will then reduce the too high fluctuating pressure. The annular plugging is removed after the drilling tool is activated for a few minutes. During which excessive fluctuating pressures acting on the formation may cause formation damage (lost circulation or collapse).
1. Description of the current situation of tripping:
at present, in the process of tripping a drilling rig, slurry in a grouting tank is pumped by a screw pump and poured into a well, whether the tripping volume of a drill string is consistent with the slurry pouring volume or not is recorded through manual observation, if the slurry pouring volume is smaller, the drilling rig is judged to be overflow, and if the slurry pouring volume is larger, the drilling rig is judged to be lost circulation. According to the method, after 3-5 drill rods or 1 drill collar is taken out, the drill pulling must be stopped temporarily, after the slurry is poured, whether the drill pulling is continued or not is determined through manual judgment, intermittent drill pulling and overflow and leakage monitoring are achieved, and overflow and leakage cannot be monitored in the drill pulling process.
2. Description of the current drilling situation:
and monitoring whether the volume increase of the grouting tank is consistent with the well entering volume of the drill column in the drilling process so as to judge whether overflow leakage occurs.
Patent numbers: ZL200710172833.6, entitled method for monitoring and controlling automatic grouting during tripping in a drilling site. A flow sensor is arranged on a return pipeline at the wellhead, a liquid level sensor is arranged in the grouting tank, an I/O node is added to remotely control the start and stop of the screw pump, and automatic grouting during tripping is realized.
The prior art has the following defects:
firstly, although the function of remotely controlling the start and stop of the screw pump is added, the process of manually starting and stopping the screw pump in the traditional intermittent grouting process is only replaced, the intermittent automatic grouting is still adopted, and the automatic grouting in the continuous drilling process is not realized.
Secondly, an automatic calculation module of the grouting amount is lacked, and the accurate monitoring is difficult to realize mainly by engineering experience estimation.
And thirdly, in the process of drilling down, in order to reduce the exciting pressure in the well, the drilling speed is not high, so that the well head returns out the drilling fluid with small and discontinuous amount, the real-time monitoring precision of the flow sensor additionally arranged on the return pipeline is difficult to guarantee, and the accurate monitoring of the in-well overflow and leakage in the process of drilling down is difficult to realize.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide a method of leak-off monitoring that enables continuous tripping and continuous tripping operations.
In order to achieve the above object, the present invention provides, in one aspect, a continuous tripping overflow leakage monitoring method, comprising the steps of: acquiring the real-time well outlet/inlet volume of a drill column; under the condition of obtaining the real-time output volume of the drill column, adjusting the real-time discharge volume of the drilling fluid injected into the well according to the real-time output volume of the drill column; judging whether overflow leakage occurs once every preset time interval, calculating the overflow leakage amount in the drill-tripping/drill-tripping process in the preset time under the condition of overflow leakage, and judging the overflow leakage grade in the drill-tripping/drill-tripping process; sending out a grading alarm according to the overflow and leakage grade of the drill tripping/drilling down process; the above process is repeated.
In an exemplary embodiment of an aspect of the present invention, the step of obtaining a real time run-in/out volume of the drill string may comprise: acquiring the real-time speed of a drill string, and identifying the inner diameter and the outer diameter of the drill string at a wellhead; and obtaining the real-time well outlet/inlet volume of the drill string according to the real-time speed, the inner diameter and the outer diameter.
In an exemplary embodiment of an aspect of the present invention, the step of adjusting the real-time displacement of the drilling fluid injected into the well according to the real-time outlet volume of the drill string may comprise: arranging an adjusting valve on a grouting pipeline connecting the grouting tank and the wellhead; when the drilling is started, determining the opening degree of a regulating valve according to the real-time well outlet volume of the drill column and the output displacement of a pump; and measuring the flow of the drilling fluid filled into the pipeline between the regulating valve and the wellhead, and adjusting the opening of the regulating valve or the output displacement of the pump under the condition that the flow is not equal to the real-time outlet volume of the drill string.
In an exemplary embodiment of an aspect of the present invention, the regulating valve may be a two-way regulating valve, and the two-way regulating valve may be capable of dividing the received drilling fluid and outputting the required drilling fluid displacement by regulating an opening degree of the two-way regulating valve.
In an exemplary embodiment of an aspect of the present invention, the step of determining whether overflow leakage occurs once every predetermined time interval may include: observing whether the liquid level height of the wellhead changes every preset time interval, observing whether drilling fluid returns from the wellhead or not under the condition that the liquid level height of the wellhead does not change, judging that well leakage occurs if no drilling fluid returns, and judging that no leakage occurs if drilling fluid returns; and judging that the well leakage occurs under the condition that the liquid level height of the well head is reduced, and judging that the overflow occurs under the condition that the liquid level height of the well head is increased.
In an exemplary embodiment of an aspect of the present invention, the calculating an overflow leakage amount during the drill-out/drill-down process within a predetermined time, and the determining an overflow leakage level during the drill-out/drill-down process may include: during tripping, calculating the overflow leakage amount according to the accumulated amount of the drilling fluid injected into the well, the accumulated volume of the drilling column discharged out of the well, the liquid level of the drilling fluid in the well head and the return condition of the drilling fluid at the well head, judging the overflow leakage grade and giving a grading alarm; when the drilling machine is drilled, the overflow leakage analysis module can calculate the overflow leakage amount, judge the overflow leakage grade and give a grading alarm according to the returned drilling fluid volume, the accumulated drilling column well entering volume, the drilling fluid liquid level in the wellhead and the wellhead drilling fluid return condition.
In an exemplary embodiment of an aspect of the invention, the level of drilling fluid in the wellhead may be determined by a first fluid level gauge disposed in the wellhead and capable of monitoring changes in the level of drilling fluid in the wellhead.
In an exemplary embodiment of an aspect of the present invention, the wellhead drilling fluid return condition may be identified by a camera, which is provided at a fluid outlet of a return pipe connecting the wellhead and the grouting tank and is capable of monitoring whether drilling fluid is returned.
In one exemplary embodiment of an aspect of the present invention, the predetermined time may be 3 to 10 seconds.
It is another object of the present invention to provide an overflow monitoring system and monitoring method that enables continuous tripping and continuous tripping operations.
The invention provides a continuous tripping and overflow leakage monitoring method. The monitoring method is realized by a continuous tripping and overflow and leakage monitoring system, wherein the monitoring system comprises a first liquid level meter, a second liquid level meter, a camera, a two-way regulating valve, a flow meter and an analysis control unit, wherein the first liquid level meter is arranged in a wellhead and can monitor the liquid level of drilling fluid in the wellhead and transmit the monitored liquid level to the analysis control unit; the second liquid level meter is arranged in the grouting tank and can monitor the liquid level of the drilling fluid in the grouting tank and transmit the monitored liquid level to the analysis control unit; the two-way regulating valve is arranged on an injection pipe connecting the grouting tank and the wellhead, and can regulate the flow of drilling fluid injected into the well in the tripping process so that the volume of the drilling fluid injected into the well is consistent with the output volume of the drill string; the flowmeter is arranged on the filling pipe and positioned between the two-way regulating valve and the wellhead, and can measure the flow of the drilling fluid in the filling well in real time and transmit the measured flow value to the analysis control unit; the camera can monitor a liquid outlet of a return pipe connecting the wellhead and the grouting tank so as to judge whether drilling fluid returns or not, and can transmit a judgment result to the analysis control unit; the analysis control unit is respectively connected with the first liquid level meter, the second liquid level meter, the camera, the two-way regulating valve and the flow meter, the analysis control unit can control the opening degree of the two-way regulating valve, and the analysis control unit can judge whether overflow leakage exists or not and determine the grade of the overflow leakage according to the liquid level monitored by the first liquid level meter, the change condition of the liquid level monitored by the second liquid level meter, the flow measured by the flow meter and the judgment result of the camera; and the monitoring method comprises the steps of: acquiring the real-time well outlet/inlet volume of a drill column; adjusting the real-time discharge amount of the drilling fluid injected into the well according to the real-time outlet volume of the drill column; calculating the overflow leakage amount in the drill-up/drill-down process within t seconds, and judging the overflow leakage grade in the drill-up/drill-down process; sending out a grading alarm according to the overflow and leakage grade of the drill tripping/drilling down process; the above process is repeated.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
(1) the invention realizes the automatic monitoring of the continuous tripping drilling well overflow leakage by arranging equipment such as a flowmeter, a camera, a two-way regulating valve, a first liquid level meter and the like and by automatically identifying the volume of a drill column, automatically regulating the grouting flow and analyzing and calculating the overflow leakage;
(2) by arranging the camera, people can be replaced by the camera to observe the return condition of the drilling fluid at the wellhead, and the condition of overflow and leakage judgment is increased by arranging the first liquid level meter, so that the accuracy of the whole overflow and leakage judgment scheme is improved;
(3) the overflow and leakage condition can be reflected more intuitively and clearly by judging the overflow and leakage grade through the change rate of the liquid level of the wellhead, so that the operating personnel can make corresponding measures according to the overflow and leakage grade.
Drawings
FIG. 1 shows a general flowchart of a continuous trip overflow monitoring method according to an exemplary embodiment of the present invention;
FIG. 2 shows a schematic block diagram of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a trip condition overflow discrimination step of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a drill-down condition overflow determination step of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention;
FIG. 5 illustrates a drill string volume acquisition flow chart for a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention;
FIG. 6 illustrates a flow chart of grout adjustment during tripping of a continuous trip overfill monitoring system according to an exemplary embodiment of the present invention;
FIG. 7 illustrates a flow chart of leak analysis determination for a continuous trip leak monitoring system in accordance with an exemplary embodiment of the present invention;
FIG. 8 shows a schematic of the equipment connection configuration of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention.
The reference numerals are explained below:
1-a first liquid level meter, 2-a wellhead, 3-a second liquid level meter, 4-a camera, 5-a grouting tank, 6-a pressure meter, 7-a grouting pump, 8-a two-way regulating valve, 9-a flowmeter, 10-an injection pipe, 11-a return pipe and 12 a recovery pipe.
Detailed Description
In the following, the continuous trip overflow monitoring system of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
FIG. 1 shows a general flowchart of a continuous trip overflow monitoring method according to an exemplary embodiment of the present invention.
In an exemplary embodiment of the present invention, as shown in FIG. 1, a continuous trip overflow monitoring method comprises the steps of:
first, the real time out/in volume of the drill string is obtained. Here, the step of obtaining real time out/in volume of the drill string may comprise: acquiring the real-time speed of a drill string, and identifying the inner diameter and the outer diameter of the drill string at a wellhead; and obtaining the real-time well outlet/inlet volume of the drill string according to the real-time speed, the inner diameter and the outer diameter. Specifically, the real-time speed V of the drill string during tripping can be directly read from the logging, and the inner diameter R of the drill string and the outer diameter R of the drill string can be obtained by identifying the type of the tripping/tripping drill string, and the real-time speed V can be obtained by the formula Q ═ V × π (R)2-r2) And comprehensively calculating the real-time well outlet/well inlet volume Q of the tripping/drilling string, wherein pi is the circumferential rate. The inner diameter R of the drill string and the outer diameter R of the drill string are obtained by identifying the type of the drill string, and the model of the drill string and the inner and outer diameter parameters of the drill string need to be manually measured firstlyThe inner diameter parameter and the outer diameter parameter of the drill string joint are recorded into a database and collected, when a drill string is to be used, the type of the drill string joint, the inner diameter parameter and the outer diameter parameter of the drill string joint and the length parameter of the drill string are directly and manually called or automatically called by a computer, the position of the drill string joint is determined according to the length parameter of the drill string, the position determination of the drill string joint is conveniently increased when the real-time well entering or well exiting volume is calculated, whether the well exiting or entering volume of the drill string joint needs to be increased or decreased or not is judged, and the system.
And then, under the condition of obtaining the real-time output volume of the drill string, adjusting the real-time discharge volume of the drilling fluid injected into the well according to the real-time output volume of the drill string. Here, in the case of obtaining the real-time output volume of the drill string, the step of adjusting the real-time discharge amount of the drilling fluid injected into the well according to the real-time output volume of the drill string may include: arranging an adjusting valve on a grouting pipeline connecting the grouting tank and the wellhead; when the drilling is started, determining the opening degree of a regulating valve according to the real-time well outlet volume of the drill column and the output displacement of a pump; and measuring the flow of the drilling fluid filled into the pipeline between the regulating valve and the wellhead, and adjusting the opening of the regulating valve or the output displacement of the pump under the condition that the flow is not equal to the real-time outlet volume of the drill string. Specifically, during tripping, the real-time discharge volume of the drilling fluid injected into the well is adjusted according to the real-time outlet volume of the drill string, so that the real-time discharge volume of the drilling fluid injected into the well is the same as the real-time outlet volume of the drill string. For example, the regulating valve may be a two-way regulating valve, which is capable of diverting the received drilling fluid, by adjusting the opening of the two-way regulating valve so that it outputs the required drilling fluid displacement. According to the volume value Q of the real-time well output of the drill column and the output displacement Q of the pumpPump and method of operating the sameBy the formula P ═ Q/QPump and method of operating the sameAnd determining the opening degree of the two-way regulating valve by 100 percent to ensure that the flow of the drilling fluid injected into the well is equal to the volume of the drilling string discharged from the well. Then, the real discharge Q of the drilling fluid injected into the pipelineIrrigation deviceMonitoring is carried out until Q is foundIrrigation deviceWhen the drilling fluid flow is not equal to Q, the drilling fluid flow difference e is obtained as Q-QIrrigation deviceUsing the formula P ═ Q/QPump and method of operating the same*100％*(1+e/Q)＝(2Q-QIrrigation device)/QPump and method of operating the sameAnd the opening of the two-way regulating valve is further regulated by 100%, and the regulating precision is improved, so that the flow of the drilling fluid injected into the well is equal to the real-time output volume of the drill string.
And then, judging whether the overflow leakage occurs once every preset time interval, calculating the wellhead overflow leakage amount in the tripping process in the preset time under the condition of the overflow leakage, and judging the overflow leakage grade in the tripping process. Here, the step of determining whether an overflow occurs every predetermined time may include: observing whether the liquid level height of the wellhead changes every preset time interval, observing whether drilling fluid returns from the wellhead or not under the condition that the liquid level height of the wellhead does not change, judging that well leakage occurs if no drilling fluid returns, and judging that no leakage occurs if drilling fluid returns; and judging that the well leakage occurs under the condition that the liquid level height of the well head is reduced, and judging that the overflow occurs under the condition that the liquid level height of the well head is increased. The predetermined time may be 3 to 10 seconds. Specifically, during the tripping and the lowering process, the liquid level height of drilling fluid in a wellhead is monitored at preset time intervals (for example, 5s), if the liquid level height is not changed, whether the drilling fluid returns out is monitored, and if the drilling fluid returns out, no overflow and leakage occur is indicated; if no drilling fluid returns, the well leakage is indicated to occur, and the corresponding leakage overflow amount is calculated. If the drilling fluid level in the wellhead rises, the formation fluid enters the well, overflow occurs, and the corresponding overflow and leakage amount is calculated. If the liquid level becomes lower, the drilling fluid leaks into the stratum, the well leakage is caused, and the corresponding leakage amount is calculated. For example, the level of drilling fluid in the wellhead may be determined by a first fluid level gauge disposed within the wellhead and capable of monitoring changes in the level of drilling fluid within the wellhead. The well mouth drilling fluid returns the condition accessible camera and discerns, and the camera setting is in the liquid outlet department of the back-out pipe of connecting well mouth and grouting tank and can monitor whether there is drilling fluid to return out. In the tripping process, as the drilling fluid injected into the well is equal to the real-time output volume of the drill string, if the drilling fluid is monitored to return out of the return pipe (namely the liquid level in the well is not at the well head and the liquid level of the well head rises), the tripping process is indicated to generate overflow, and if the liquid level of the well head is reduced, the tripping process is indicated to generate well leakage. In the drilling process, the difference value between the volume of the drilling string entering the well and the volume of the returned drilling fluid (if the liquid level in the well is not at the well head, the increased volume converted by the lifting of the drilling fluid in the well is calculated), if the difference value is larger than 0 (a threshold value can be selected according to the actual condition, and the example is 0), the occurrence of the lost circulation in the drilling process is indicated, and if the difference value is smaller than 0, the occurrence of the overflow in the drilling process is indicated.
Next, a classification alarm is issued based on the overflow rating of the tripping/tripping process. Specifically, according to the calculated overflow and leakage amount of the wellhead and the corresponding overflow and leakage grade in the tripping or tripping process, corresponding alarms are given so that operators can perform corresponding adjustment. In the process of tripping the drill, the overflow leakage amount is the difference value between the accumulated amount of the drilling fluid filled into the well and the accumulated volume of the drill string discharged from the well in order to maintain the liquid level height in the well before the preset time period. If the difference is greater than 0 (a threshold value may be actually selected, for example, 0), then lost circulation is indicated to occur within the predetermined time period, and if the difference is less than 0 (a threshold value may be actually selected, for example, 0), then overflow is indicated to occur within the predetermined time period. In the drilling process, if the liquid level in the well is at the well head, the overflow leakage amount is represented by accumulating the difference value between the volume of the drilling string entering the well and the volume variation of the drilling fluid in the grouting tank, if the difference value is larger than 0 (a threshold value can be selected according to the practice, the example is 0), the well leakage is indicated in the drilling process, and if the difference value is smaller than 0 (a threshold value can be selected according to the practice, the example is 0), the overflow is indicated in the drilling process. If the liquid level in the well is not at the well head, the overflow leakage amount is characterized by the difference of the product of the accumulated volume of the drilling string entering the well and the height change of the liquid level in the well and the annular space area, if the difference is larger than 0 (a threshold value can be selected according to the actual condition, the example is 0), the well leakage is indicated in the drilling process, and if the difference is smaller than 0 (a threshold value can be selected according to the actual condition, the example is 0), the overflow is indicated in the drilling process. Here, the indication of the overflow level has no fixed standard, and may be set according to the requirement, for example, in the predetermined time period, the absolute value of the threshold is subtracted from the difference, and the time period is divided by the absolute value of the threshold, so as to obtain the overflow amount per second, thereby setting the early warning level. When the overflow leakage amount is less than 1L/s, the overflow leakage grade is first grade; when the overflow leakage amount is less than or equal to 1L/s and less than 4L/s, the overflow leakage grade is two-stage; when the overflow leakage amount is less than 8L/s and is less than or equal to 4L/s, the overflow leakage grade is three-grade; when the overflow leakage amount is less than or equal to 8L/s and less than 10L/s, the overflow leakage grade is three grade, and when the overflow leakage amount is more than or equal to 10L/s, the overflow leakage grade is four grade.
Next, the above process is repeated. Specifically, the above operations are repeated to continuously monitor the tripping and tripping.
FIG. 2 shows a schematic block diagram of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention; FIG. 8 shows a schematic of the equipment connection configuration of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention.
In yet another exemplary embodiment of the present invention, the continuous tripping overfill monitoring method can be implemented by a continuous tripping overfill system, as shown in fig. 2, which can comprise a first level gauge 1, a second level gauge 3, a camera 4, a two-way regulating valve 8, a flow meter 9, and an analysis control unit (not shown in fig. 2). Wherein, first level gauge 1 sets up in well head 2 and can monitor the liquid level of drilling fluid in the well head 2 and convey the liquid level of monitoring to analysis and control unit. The second liquid level meter 3 is arranged in the grouting tank 5 and can monitor the liquid level of drilling fluid in the grouting tank 5 and transmit the monitored liquid level to the analysis control unit. Specifically, as shown in fig. 2, the continuous tripping and overflow and leakage monitoring system mainly comprises a first liquid level meter 1, a wellhead 2, a second liquid level meter 3, a camera 4, a grouting tank 5, a two-way regulating valve 8, a flowmeter 9, a grouting pipe 10 and a return pipe 11. Wherein, be provided with the liquid outlet on the grout jar 5, well head 2 has inlet and leakage fluid dram, and the one end of filling pipe 10 links to each other with the liquid outlet of grout jar 5, and the other end links to each other with the inlet of well head 2. The return pipe 11 is connected at one end to a liquid outlet of the wellhead 2 and at the other end to the grouting tank 5, so that the drilling liquid overflowing from the wellhead 2 is discharged into the grouting tank 5.
In this embodiment, a first level gauge 1 is arranged in the wellhead 2, the first level gauge 1 being capable of determining the level of drilling fluid in the wellhead 2 and transmitting the result of the determination to the analysis and control unit. The second level gauge 3 is disposed in the grouting tank 5 and is capable of measuring a liquid level change in the grouting tank 5 and transmitting the measured liquid level change result to the analysis control unit. Specifically, the first liquid level meter 1 is arranged in the wellhead 2, and the first liquid level meter 1 can monitor the change condition of the liquid level in the wellhead 2 (namely whether the liquid level is higher or lower, and the corresponding change rate) and transmit the measured liquid level result to the analysis control unit. The second liquid level meter 3 is arranged in the grouting tank 5, the second liquid level meter 3 can monitor the change condition of the liquid level in the grouting tank 5, and therefore the analysis control unit can calculate the volume change of the drilling fluid in the grouting tank according to the change value of the liquid level in the grouting tank 5, namely the volume of the drilling fluid returned by the wellhead 2 during drilling.
In this embodiment, the two-way regulating valve 8 is arranged on the injection pipe 10 connecting the grouting tank 5 and the wellhead 2, and can regulate the flow of the drilling fluid injected into the well in the tripping process so that the volume of the drilling fluid injected into the well is consistent with the volume of the drilling string discharged from the well. Specifically, as shown in fig. 2, the two-way regulating valve 8 is disposed on the filling pipe 10, the two-way regulating valve 8 may have a liquid inlet, a first liquid outlet, and a second liquid outlet, and the filling pipe 10 includes a first pipe section and a second pipe section. Wherein, the one end of first pipeline section is connected with the liquid outlet of grout jar 5, and the other end is connected with the inlet of double-circuit governing valve 8, and the one end of second pipeline section is connected with the first liquid outlet of double-circuit governing valve 8, and the other end is connected with the inlet of well head 2. During the tripping process, the opening degree of the double-path adjusting valve 8 is adjusted to enable the flow of the drilling fluid poured into the well (the flow of the drilling fluid discharged from the first liquid outlet) to be equal to the real-time well outlet volume of the drill string, so that continuous tripping operation can be carried out.
In this embodiment, the continuous tripping and overflow and leakage monitoring system may further include a grouting pump 7 disposed on the grouting pipe 10 and located between the two-way regulating valve 8 and the grouting tank 5, and the outlet pipe diameter flux of the grouting pump 7 is equal to the total inner diameter flux of the two-way regulating valve 8. The monitoring system can also comprise a recovery pipe 12, one end of the recovery pipe 12 is connected with the two-way regulating valve 8, and the other end of the recovery pipe 12 is connected with the return pipe 11. The monitoring system may further comprise a pressure gauge 6, the pressure gauge 6 being arranged on the grouting pipe 10 and located between the grouting pump 7 and the grouting tank 5 and capable of measuring the real-time working pressure of the grouting pump 7. Specifically, the continuous tripping and overflow and leakage monitoring system can further comprise a grouting pump 7 arranged on the first section of the grouting pipe 10, and the grouting pump 7 conveys the drilling fluid in the grouting tank 5 to the liquid inlet of the two-way regulating valve 8. For example, the grouting pump may be a screw pump. However, the present invention is not limited thereto as long as it can transport drilling fluid. As shown in fig. 2, the continuous tripping and overflow and leakage monitoring system may further include a recovery pipe 12, one end of the recovery pipe 12 is connected to the second liquid outlet of the two-way regulating valve 8, and the other end is connected to the return pipe 11, so that the redundant drilling fluid can be returned to the grouting tank 5 for recycling. Here, the monitoring system may further include a pressure gauge 6, the pressure gauge 6 being disposed on the grout pipe 10 between the grout pump 7 and the grout tank 5 and being capable of measuring a real-time operating pressure of the grout pump 7.
In this embodiment, the analysis control unit may further comprise a drill string volume calculation module capable of automatically calculating the real-time in/out volume of the drill string. Specifically, the method for acquiring the real-time outlet/inlet volume of the drill string comprises the steps of directly reading the real-time tripping/lowering speed V from the logging, acquiring the inner diameter R of the drill string and the outer diameter R of the drill string by identifying the type of the tripping/lowering drill string, and acquiring the real-time tripping/lowering volume of the drill string according to the formula Q-V-pi (R2-r2) And comprehensively calculating the real-time well outlet/well inlet volume Q of the tripping/drilling string, wherein pi is the circumferential rate. The inner diameter R of the drill string and the outer diameter R of the drill string are obtained by identifying the type of the drill string, the inner and outer diameter parameters of the drill string joint and the inner and outer diameter parameters of the drill string joint need to be manually recorded into a database for collection, when the drill string is used, the type of the drill string joint, the inner and outer diameter parameters of the drill string joint and the length parameter of the drill string are directly and manually called or automatically called by a computer, the position of the drill string joint is determined according to the length parameter of the drill string, the position determination of the drill string joint is increased when the real-time well entering or well exiting volume Q is calculated, whether the well exiting or well entering volume of the drill string joint needs to be increased or.
FIG. 5 illustrates a drill string volume acquisition flow chart for a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention.
As shown in fig. 5, the drill string volume acquisition procedure is:
firstly, acquiring the real-time outlet or inlet speed V of the drill string.
Next, identifying the drill string type, obtaining the inner diameter R and the outer diameter R of the drill string, and obtaining the inner diameter R and the outer diameter R according to the formula Q ═ V × (R)2-r2) Calculating the real-time outlet volume Q or inlet volume Q of the drill string;
next, the drill string real-time volume is output to the respective module according to the drill string status (i.e., whether the drill string is tripping or tripping). When the drilling is started, the calculated output volume Q of the drill stem is output to a grouting flow adjusting module and an overflow and leakage analyzing module, and grouting flow adjusting and overflow and leakage analyzing calculation are carried out; when the drilling is down-hole drilling, the obtained drilling column well entering volume Q is directly output to an overflow and leakage analysis module for overflow and leakage analysis and calculation.
The above process is repeated every t seconds. The time t can be 3-10 s, such as 5 s.
In this embodiment, the analysis control unit may further include a grouting flow adjusting module, and during tripping, the grouting flow adjusting module may adjust the opening of the two-way adjusting valve 8 according to the volume of the drill string exiting the well, thereby adjusting the flow of the drilling fluid injected into the well. Specifically, the analysis control unit calculates the real-time outlet volume of the drill string, and then adjusts the opening of the two-way adjusting valve 8 according to the real-time outlet volume of the drill string. The flow of the drilling fluid injected into the well in the tripping process is equal to the output volume of the drill stem, and continuous tripping is realized. When the drilling starts, the grouting flow adjusting module can determine the opening degree of the two-way adjusting valve according to the following formula:
P＝Q/Qpump and method of operating the same*100％*(1+e/Q)
Wherein, P represents the opening of the two-way regulating valve, Q represents the real-time well outlet volume of the drill string, and QPump and method of operating the sameRepresenting the output displacement of the grouting pump, e representing the flow difference, and e being Q-QIrrigation device，QIrrigation deviceThe amount of drilling fluid pumped into the well is determined by the flow meter during tripping. That is, during tripping, the volume Q of the real-time well is output according to the drill string and the formula P Q/QPump and method of operating the sameInitial adjustment of 100%The opening of the two-way regulating valve 8 enables the flow of the drilling fluid injected into the well to be equal to the volume of the drilling string discharged from the well; at the same time, the actual flow Q of the drilling fluid injected into the well is measured by the flowmeter 9Irrigation deviceObtaining the flow difference e ═ Q-QIrrigation deviceUsing the formula P ═ Q/QPump and method of operating the same*100％*(1+e/Q)＝(2Q-QIrrigation device)/QPump and method of operating the same100% to further regulate the flow of drilling fluid into the well. Here, the valve opening degree of the two-way regulator valve 8 is expressed by the formula P of Q/QPump and method of operating the same100% and the correction formula P Q/QPump and method of operating the same100%. 1+ e/Q comes coordinated adjustment, can improve the regulation precision, compares with traditional feedback formula regulation mode according to well pressure change situation, lets the regulation precision higher through the regulation mode of accurate calculation to save computation time and regulation time, improve monitoring rate.
In addition, the grouting adjusting module can also adjust the opening of the double-path adjusting valve 8 to enable the volume of the drilling fluid poured into the well to be the difference between the volume of the drilling string entering the well and the volume of the drilling fluid returning out when the volume of the drilling string entering the well is larger than the volume of the drilling fluid returning out in the drilling process, and the drilling fluid is supplemented into the well. Specifically, drilling fluid is not generally poured into the wellhead 2 in the drilling process, only when the grouting adjusting module monitors that the well entering volume of the drill string is larger than the drilling fluid return volume (meanwhile, the first liquid level meter detects that the liquid level of the wellhead is not continuously reduced), namely, the drilling fluid overflows and is lost due to the fact that the drill string is too fast lowered, the drilling fluid needs to be supplemented into the well, and at the moment, the opening degree of the double-path adjusting valve 8 can be adjusted to enable the volume of the drilling fluid poured into the well to be the difference between the well entering volume of the drill string and the drilling fluid return volume. When drilling down, the grouting flow adjusting module can determine the opening degree of the two-way adjusting valve according to the following formula:
P＝e/Qpump and method of operating the same*100％
Wherein P represents the opening degree of the two-way regulating valve, QPump and method of operating the sameIndicating the output displacement of the grouting pump, e indicating the flow difference, e being Q-QReturn toQ represents the real-time run-in volume of the drill string, QReturn toThe volume of the drilling fluid returned from the return pipe during drilling down. By regulating the opening P of the two-way regulating valve 8 to e/QPump and method of operating the same*100％＝(Q-QReturn to)/QPump and method of operating the same100% of the flow of make-up drilling fluid into the wellIs QIrrigation deviceMake Q beIrrigation device+QReturn to＝Q。
FIG. 6 illustrates a flow chart of grout adjustment during tripping of a continuous trip overfill monitoring system according to an exemplary embodiment of the present invention. As shown in fig. 6, the flow of adjusting the grouting amount is:
firstly, the grouting flow adjusting module receives the real-time outlet volume Q of the drill string from the drill string volume calculating module when the drill string is started.
Next, Q/Q is obtained according to the formula PPump and method of operating the sameAnd 100% of the opening of the two-way regulating valve 8 is regulated and drilling fluid is poured into the wellhead 2. Flow rate Q of drilling fluid poured into wellhead 2 measured by flowmeter 9Irrigation deviceObtaining the flow difference e ═ Q-QIrrigation deviceUsing the correction formula P ═ Q/QPump and method of operating the same100%, (1+ e/Q) further regulates the opening of the two-way regulating valve 8.
And then, recording the flow of the drilling fluid which is accumulated and injected into the wellhead 2 within t seconds and outputting the flow to an overflow and leakage analysis module.
And the overflow and leakage analysis module analyzes and judges according to the received information and sends out a grading alarm according to a judgment result.
The above steps are repeated every t seconds. The time t can be 3-10 s, such as 5 s.
In this embodiment, a flow meter 9 is provided on the injection pipe 10 between the two-way regulating valve 8 and the wellhead 2, and the flow meter 9 is capable of testing the flow rate of the drilling fluid injected into the well from the injection tank 5 in real time and transmitting the measured flow rate value to the analysis control unit. Specifically, as shown in fig. 2, the flow meter 9 is provided on the first pipe section, and the flow meter 9 can measure the flow rate of the drilling fluid poured into the wellhead 2 in real time and transmit the measured flow rate value to the analysis control unit. The flow meter 9 may be, for example, an electromagnetic flow meter, which is connected to the analysis control unit via a signal line. However, the present invention is not limited thereto, and other flow meters capable of measuring the flow rate of the drilling fluid in the injection pipe in real time and transmitting the measurement result to the analysis control unit may be used.
In this embodiment, camera 4 can monitor the liquid outlet of the return pipe 11 of connecting well head 2 and grouting tank 5 in order to judge whether there is drilling fluid to return, and can give the analysis and control unit with the judged result transmission. Specifically, the camera 4 is arranged on the grouting tank 5 or the return pipe 11, so that the camera 4 can monitor the liquid outlet of the return pipe 11 and can identify whether drilling fluid returns from the return pipe 11. The camera 4 transmits the result of the judgment to the analysis control unit. For example, the camera 4 can convert the result of the determination into a digital signal to be transmitted to the control unit.
FIG. 7 illustrates a flow chart of leak analysis determination for a continuous trip leak monitoring system according to an exemplary embodiment of the present invention.
In this embodiment, analysis and control unit links to each other with first level gauge 1, second level gauge 3, camera 4, double-circuit governing valve 8 and flowmeter 9 respectively, and analysis and control unit can control double-circuit governing valve 8's aperture, and analysis and control unit can judge whether there is the overflow and leak and confirm the overflow and leak the grade according to first level gauge 1 monitoring liquid level, the situation of change of second level gauge 3 monitoring liquid level and camera 4's judged result. Specifically, as shown in fig. 8, the analysis control unit is connected to the first level meter 1, the second level meter 3, the camera 4, the two-way regulating valve 8, and the flow meter 9 through wires, respectively. The analysis control unit can adjust the opening degree of the two-way regulating valve 8 by transmitting a signal to the two-way regulating valve 8, so that the flow of the drilling fluid poured into the wellhead 2 is adjusted. For example, the two-way control valve may have an electric valve, and the evaluation control unit adjusts the opening of the two-way control valve by adjusting the electric valve.
In this embodiment, the analysis control unit can determine whether there is overflow leakage and determine the level of overflow leakage according to the liquid level monitored by the first liquid level meter 1, the change condition of the liquid level monitored by the second liquid level meter 3 and the judgment result of the camera 4. That is to say, the analysis control unit can synthesize the liquid levels monitored by the first liquid level meter 1 and the second liquid level meter 3 and the judgment result of the camera 4 to calculate and judge whether the overflow and the leakage occur in the process of tripping the drill and the process of tripping the drill. Specifically, if the liquid level of the wellhead 2 measured by the first liquid level meter 1 is not changed, whether drilling fluid returns or not is observed according to a drilling fluid image or video returned by the wellhead 2 provided by the camera 4, and if no drilling fluid returns, lost circulation is caused; if the drilling fluid returns, the well leakage does not occur. If the result measured by the first liquid level meter 1 shows that the liquid level in the wellhead 2 becomes low, the occurrence of lost circulation can be judged; if the liquid level in the wellhead 2 becomes high, an overflow is indicated. Here, the analysis control unit performs overflow and leakage monitoring every 3 to 10 seconds. For example, the analysis control unit performs overflow monitoring analysis every 5 seconds, and issues a classification overflow alarm according to the overflow level condition. The analysis control unit can automatically and centrally monitor and control the data and equipment of the system. For example, the analysis control unit can be constructed by adopting a PLC as a control unit, an analog input/output module, a digital input/output module and an intermediate relay, and the PLC is interconnected and communicated through the Ethernet, so that an operator can realize centralized monitoring at a monitoring terminal.
In this embodiment, the analysis control unit may further include an overflow and leakage analysis module, and when tripping, the overflow and leakage analysis module may calculate the overflow and leakage amount, determine the overflow and leakage level, and give a classification alarm according to the accumulated amount of drilling fluid injected into the well, the accumulated volume of the drill string out of the well, the monitoring liquid level of the first liquid level meter 1, and the result identified by the camera 4; when the drilling machine drills down, the overflow and leakage analysis module can calculate the overflow and leakage amount, judge the overflow and leakage grade and give a grading alarm according to the volume change of the drilling fluid in the grouting tank 5 (namely the volume of the drilling fluid returned), the accumulated drilling string well entering volume, the monitoring liquid level of the first liquid level meter 1 and the identification result of the camera 4. Specifically, in the tripping process, the overflow and leakage analysis module can calculate the overflow and leakage amount in the tripping process through the accumulated amount of drilling fluid injected into the well measured by the flowmeter, the output volume of the drill string obtained by the drill string volume calculation module, the wellhead liquid level change condition monitored by the first liquid level meter 1 and the result identified by the camera 4, judge the overflow and leakage level in the tripping process and give a grading alarm. In the drilling process, the overflow and leakage analysis module can comprehensively calculate the overflow and leakage amount in the drilling process according to the monitoring data (updated every t seconds) of the first liquid level meter 1, the accumulated drilling string well entering volume, the drilling fluid volume variation in the grouting tank 5 and the image recognition result of the camera 4, judge the level of the overflow and leakage condition in the drilling process and give a grading alarm. As shown in fig. 7, the overflow analysis and determination process includes the steps of:
first, the overflow analysis module receives the real time out/in volume Q of the drill string and reads the readings of the first and second level gauges 1, 3.
Next, the readings of the first gauge 1 and the second gauge 3 are updated once every t seconds, t may be 3-10 s, e.g. 5 s.
Next, the overflow and leak analysis module determines whether the reading of the first level meter 1 changes (i.e., whether the wellhead liquid level changes).
If the reading of the first liquid level meter 1 is not changed (namely the wellhead liquid level is not changed), whether drilling fluid flows out of the return pipe 11 or not is monitored by the camera 4. When the drilling fluid flows out of the return pipe 11, no overflow and leakage occur; when no drilling fluid flows out of the return pipe 11, a lost circulation is indicated.
If the reading of the first liquid level meter 1 changes, when the reading of the first liquid level meter 1 becomes large (namely the liquid level at the well head becomes high), judging that overflow occurs; when the indication number of the first liquid level meter 1 is reduced (namely the liquid level at the well head is reduced), the occurrence of the lost circulation is judged.
Then, an alarm is given according to the result of the determination. The overflow leakage grade is represented by no fixed standard, and the overflow leakage quantity per second in the drilling-out or drilling-down process can be divided into intervals so as to set the early warning level. For example, when the overflow drain amount is less than 1L/s, the overflow drain level is one level; when the overflow leakage amount is less than or equal to 1L/s and less than 4L/s, the overflow leakage grade is two-stage; when the overflow leakage amount is less than 8L/s and is less than or equal to 4L/s, the overflow leakage grade is three-grade; when the overflow leakage amount is less than or equal to 8L/s and less than 10L/s, the overflow leakage grade is three grade, and when the overflow leakage amount is more than or equal to 10L/s, the overflow leakage grade is four grade.
FIG. 3 is a schematic diagram illustrating a trip condition overflow discrimination step of a continuous trip overflow monitoring system according to an exemplary embodiment of the present invention; FIG. 4 is a schematic diagram illustrating a drill-down condition overflow determination step of a continuous tripping overflow monitoring system according to an exemplary embodiment of the present invention.
In this embodiment, as shown in fig. 3 and 4, the overflow monitoring system of the continuous tripping overflow monitoring system comprises the following steps:
the method for monitoring the overflow and leakage in the drill tripping process comprises the following steps:
s1, acquiring the real-time output volume of the drill string. Specifically, a drill string volume calculation module in an analysis control unit is used for acquiring the real-time well outlet volume of the drill string.
And S2, adjusting the flow of the drilling fluid poured into the well according to the real-time output volume of the drill string. Specifically, a grouting flow adjusting module of the analysis control unit adjusts the valve opening of the two-way adjusting valve according to the acquired real-time output volume of the drill string, so that the flow of the drilling fluid injected into the well is controlled to enable the volume of the drilling fluid injected into the well to be equal to the real-time output volume of the drill string.
And S3, calculating the overflow and leakage amount and judging the overflow and leakage grade. Specifically, an overflow and leakage analysis module of the analysis control unit comprehensively calculates the overflow and leakage amount in the drilling process according to the wellhead liquid level condition monitored by the first liquid level meter, the accumulated amount of the drilling fluid poured into the well, the accumulated drill string outlet volume and whether the drilling fluid returns out from the drilling fluid return pipe monitored by the camera, and judges the overflow and leakage condition grade in the drilling process.
And S4, sending out a grading alarm. Specifically, the analysis control unit issues a drill tripping process classification overflow alarm according to the overflow situation level of the drill tripping process.
The overflow and leakage monitoring method in the drilling process comprises the following steps:
s1, acquiring the real-time well entering volume of a drill column. Specifically, a drill string volume calculation module in an analysis control unit is used for acquiring the real-time well entering volume of the drill string.
And S2, determining the volume of the returned drilling fluid according to the liquid level change in the grouting tank. Specifically, a grouting flow adjusting module of the analysis control unit calculates the volume of the drilling fluid returned in the drilling process according to the liquid level height change detected by a second liquid level meter in the grouting tank.
And S3, calculating the overflow and leakage amount and judging the overflow and leakage grade. Specifically, an overflow and leakage analysis module of the analysis control unit comprehensively calculates the overflow and leakage amount in the drilling process according to the wellhead liquid level condition monitored by the first liquid level meter, the volume of the returned drilling fluid, the accumulated drilling string well entering volume and whether the drilling fluid return pipe monitored by the camera returns the drilling fluid or not, and judges the overflow and leakage condition grade in the drilling process.
And S4, sending out a grading alarm. Specifically, the analysis control unit issues a drill-down process classification overflow alarm according to the overflow condition level of the drill-down process.
In this embodiment, the continuous tripping and overflow and leakage monitoring method includes the steps of:
first, the real time out/in volume of the drill string is obtained. Specifically, when the drill string is in the drilling state, the type and the drilling speed of the drill string are read by a drill string volume calculating module of the continuous tripping overflow monitoring system analysis control unit, and the real-time well outlet volume of the drill string is calculated. When the drill string is drilled down, the type and the drilling speed of the drill string are read by a drill string volume calculating module of the continuous tripping and overflow monitoring system analysis control unit, and the real-time well entering volume of the drill string is calculated.
Next, the real-time displacement of drilling fluid injected into the well is adjusted according to the real-time output volume of the drill string. In particular, during tripping, the grouting flow regulating module of the continuous tripping and overflow and leakage monitoring system analysis control unit is used for regulating the opening of the two-way regulating valve, so that the amount (volume) of drilling fluid injected into the well is the same as the real-time output volume of the drill string. And then, calculating the overflow leakage amount in the drill-up/drill-down process within t seconds, and judging the overflow leakage grade in the drill-up/drill-down process. Specifically, during tripping, an overflow and leakage analysis module of the continuous tripping and leakage monitoring system analyzes and controls an overflow and leakage amount in the tripping process according to the accumulated well outlet volume of the drill string, the accumulated amount of drilling fluid injected into the well and the change of the liquid level of the wellhead in t seconds, and judges the overflow and leakage grade in the tripping process. When the continuous tripping drilling overflow and leakage monitoring system is used for drilling, an overflow and leakage analysis module of the continuous tripping drilling overflow and leakage monitoring system analyzes and controls an overflow and leakage amount in the drilling process according to the accumulated well entering volume of the drilling string, the accumulated volume of the returned drilling fluid, whether the drilling fluid returns and the change of the liquid level of the wellhead, and the overflow and leakage grade in the drilling process is judged. Here, t may be 3-10 s, i.e. overflow leakage monitoring is performed every 3-10 s. Drilling fluid is not generally filled into the well in the drilling process, only when the drilling speed is too high and the well entering volume of the drill stem is larger than the returning volume of the drilling fluid, the drilling fluid needs to be filled into the well, and the volume of the filled drilling fluid is equal to the difference of the well entering volume of the drill stem minus the returning volume of the drilling fluid.
Next, a classification alarm is issued based on the overflow rating of the tripping/tripping process. Specifically, the continuous tripping and overflow monitoring system gives corresponding alarms according to the overflow and the overflow grade in the tripping or tripping process, so that the operators can perform corresponding adjustment.
Next, the above process is repeated. Specifically, the above operations are repeated to continuously monitor the tripping and tripping.
In summary, the beneficial effects of the invention can include at least one of the following:
(1) the invention realizes the automatic monitoring of the continuous tripping drilling well overflow leakage by arranging equipment such as a flowmeter, a camera, a two-way regulating valve, a first liquid level meter and the like and by automatically identifying the volume of a drill column, automatically regulating the grouting flow and analyzing and calculating the overflow leakage;
(2) by arranging the camera, people can be replaced by the camera to observe the return condition of the drilling fluid at the wellhead, and the condition of overflow and leakage judgment is increased by arranging the first liquid level meter, so that the accuracy of the whole overflow and leakage judgment scheme is improved;
(3) using the formula P ═ Q/QPump and method of operating the same100% and the correction formula P Q/QPump and method of operating the sameThe opening degree of the two-way regulating valve is cooperatively regulated by 100 percent (1+ e/Q), so that the regulating precision is improved, and compared with the traditional feedback regulating mode according to the well pressure change condition, the regulating precision is higher through the regulating mode of accurate calculation, the calculating time and the regulating time are saved, and the monitoring rate is improved;
(4) the overflow and leakage condition can be reflected more intuitively and clearly by judging the overflow and leakage grade through the change rate of the liquid level of the wellhead, so that the operating personnel can make corresponding measures according to the overflow and leakage grade.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims (10)

1. A continuous tripping lost circulation monitoring method is characterized by comprising the following steps:
acquiring the real-time well outlet/inlet volume of a drill column;
under the condition of obtaining the real-time output volume of the drill column, adjusting the real-time discharge volume of the drilling fluid injected into the well according to the real-time output volume of the drill column;
judging whether overflow leakage occurs once every preset time interval, calculating the overflow leakage amount in the drill-tripping/drill-tripping process in the preset time under the condition of overflow leakage, and judging the overflow leakage grade in the drill-tripping/drill-tripping process;
sending out a grading alarm according to the overflow and leakage grade of the drill tripping/drilling down process;
the above process is repeated.
2. The continuous trip overflow monitoring method of claim 1, wherein the step of obtaining a real-time out/in volume of the drill string comprises:
acquiring the real-time speed of a drill string, and identifying the inner diameter and the outer diameter of the drill string at a wellhead;
and obtaining the real-time well outlet/inlet volume of the drill string according to the real-time speed, the inner diameter and the outer diameter.
3. The continuous trip overflow monitoring method of claim 1, wherein the step of adjusting the real-time displacement of drilling fluid injected into the well based on the real-time exit volume of the drill string comprises:
arranging an adjusting valve on a grouting pipeline connecting the grouting tank and the wellhead;
when the drilling is started, determining the opening degree of a regulating valve according to the real-time well outlet volume of the drill column and the output displacement of a pump;
and measuring the flow of the drilling fluid filled into the pipeline between the regulating valve and the wellhead, and adjusting the opening of the regulating valve or the output displacement of the pump under the condition that the flow is not equal to the real-time outlet volume of the drill string.
4. The continuous trip overflow and leak monitoring method of claim 3, wherein the regulating valve is a two-way regulating valve, the two-way regulating valve can divide the received drilling fluid, and the two-way regulating valve can output the required drilling fluid displacement by regulating the opening degree of the two-way regulating valve.
5. The continuous trip overflow monitoring method of claim 1, wherein the step of determining whether an overflow occurs every predetermined time interval comprises:
observing whether the liquid level height of the wellhead changes every preset time interval, observing whether drilling fluid returns from the wellhead or not under the condition that the liquid level height of the wellhead does not change, judging that well leakage occurs if no drilling fluid returns, and judging that no leakage occurs if drilling fluid returns;
and judging that the well leakage occurs under the condition that the liquid level height of the well head is reduced, and judging that the overflow occurs under the condition that the liquid level height of the well head is increased.
6. The continuous tripping drilling excessive leakage monitoring method according to claim 1, wherein the step of calculating the excessive leakage amount in the tripping/tripping process within a predetermined time and judging the level of the excessive leakage in the tripping/tripping process comprises the steps of:
during tripping, calculating the overflow amount according to the accumulated amount of drilling fluid injected into the well, the accumulated volume of the drilling column discharged out of the well, the liquid level of the drilling fluid in the well head and the return condition of the drilling fluid at the well head, judging the overflow level and giving a grading alarm;
when the drilling machine is drilled, the overflow and leakage analysis module can calculate the overflow and leakage amount, judge the overflow and leakage grade and give a grading alarm according to the returned drilling fluid, the accumulated drilling column well entering volume, the drilling fluid liquid level in the wellhead and the well wellhead drilling fluid return condition.
7. The continuous trip overflow monitoring method of claim 6 wherein the level of drilling fluid in the wellhead is determined by a first fluid level gauge positioned in the wellhead and capable of monitoring changes in the level of drilling fluid in the wellhead.
8. The continuous tripping drilling overflow and leakage monitoring method of claim 6, wherein the well mouth drilling fluid return condition is identified by a camera, and the camera is arranged at a liquid outlet of a return pipe connecting the well mouth and the grouting tank and can monitor whether drilling fluid returns.
9. The continuous trip overflow leakage monitoring method of claim 1 or 5, wherein the predetermined time is 3-10 seconds.
10. A continuous tripping and overflow and leakage monitoring method is characterized by being realized by a continuous tripping and overflow and leakage monitoring system, wherein the monitoring system comprises a first liquid level meter, a second liquid level meter, a camera, a two-way regulating valve, a flow meter and an analysis control unit,
the first liquid level meter is arranged in the wellhead and can monitor the liquid level of drilling fluid in the wellhead and transmit the monitored liquid level to the analysis control unit;
the second liquid level meter is arranged in the grouting tank and can monitor the liquid level of the drilling fluid in the grouting tank and transmit the monitored liquid level to the analysis control unit;
the two-way regulating valve is arranged on an injection pipe connecting the grouting tank and the wellhead, and can regulate the flow of drilling fluid injected into the well in the tripping process so that the volume of the drilling fluid injected into the well is consistent with the output volume of the drill string;
the flowmeter is arranged on the filling pipe and positioned between the two-way regulating valve and the wellhead, and can measure the flow of the drilling fluid in the filling well in real time and transmit the measured flow value to the analysis control unit;
the camera can monitor a liquid outlet of a return pipe connecting the wellhead and the grouting tank so as to judge whether drilling fluid returns or not, and can transmit a judgment result to the analysis control unit;
the analysis control unit is respectively connected with the first liquid level meter, the second liquid level meter, the camera, the two-way regulating valve and the flow meter, the analysis control unit can control the opening degree of the two-way regulating valve, and the analysis control unit can judge whether overflow leakage exists or not and determine the grade of the overflow leakage according to the liquid level monitored by the first liquid level meter, the change condition of the liquid level monitored by the second liquid level meter, the flow measured by the flow meter and the judgment result of the camera;
and the monitoring method comprises the steps of:
acquiring the real-time well outlet/inlet volume of a drill column;
adjusting the real-time discharge amount of the drilling fluid injected into the well according to the real-time outlet volume of the drill column;
calculating the overflow leakage amount in the drill-up/drill-down process within t seconds, and judging the overflow leakage grade in the drill-up/drill-down process;
sending out a grading alarm according to the overflow and leakage grade of the drill tripping/drilling down process;
the above process is repeated.
CN202010589068.3A 2020-06-24 2020-06-24 Continuous tripping and drilling overflow and leakage monitoring method Active CN111749633B (en)

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