CN111980679A - Conversion device of drilling liquid level monitor and liquid level monitoring method thereof - Google Patents
Conversion device of drilling liquid level monitor and liquid level monitoring method thereof Download PDFInfo
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- CN111980679A CN111980679A CN202010885857.1A CN202010885857A CN111980679A CN 111980679 A CN111980679 A CN 111980679A CN 202010885857 A CN202010885857 A CN 202010885857A CN 111980679 A CN111980679 A CN 111980679A
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Abstract
A conversion device of a drilling liquid level monitor and a liquid level monitoring method thereof are disclosed, the device comprises an upper joint and a pressure-bearing stop valve, the top of the upper joint is connected with the liquid level monitor, and the bottom of the upper joint is connected with the top end of an upper end cover of the pressure-bearing stop valve; the pressure-bearing stop valve comprises an upper end cover, the bottom end of the upper end cover is connected with one end of the valve body, and the other end of the valve body is connected with a overlock of a casing head pressure gauge; before liquid level monitoring, a liquid level monitor is connected with a cocker part of a sleeve head pressure gauge through the device, a pressure relief liquid discharge hole is opened to discharge drilling fluid and shaft gas, the phenomenon that in the liquid level monitoring process, the air pressure and the drilling fluid in a shaft influence the transmission and reflection of sound waves of the liquid level monitor to further influence the monitoring precision is prevented, and then the pressure relief vent hole is closed; opening the pressure-bearing stop valve and the liquid level monitor, starting monitoring, reading data after monitoring is finished, and closing the monitor; the invention has the advantages of simple structure, convenient installation and operation, safety, high efficiency and strong practicability.
Description
Technical Field
The invention belongs to the technical field of oil field drilling liquid level monitoring, and particularly relates to a drilling liquid level monitor conversion device and a liquid level monitoring method thereof.
Background
In the oil drilling process, the liquid level monitor can monitor the change condition of the drilling fluid at any time, so that the occurrence of well kick, well leakage and blowout accidents is avoided, the liquid level monitor is installed at a wellhead according to the working principle, and the change condition of the drilling fluid is monitored according to the sound wave reflection principle. The conventional monitoring method is to install the instrument in the borehole for monitoring, but each installation and disassembly needs to consume a lot of time and energy, and further the drilling time is influenced. In order to reduce the time for disassembling and assembling instruments and the consumption of human body physical ability, some manufacturers install the liquid level monitor at a kill-job manifold or a throttle manifold flange for a long time by using a simple joint, so that the time for frequent disassembly and assembly and the consumption of physical ability are shortened, and the normal time for drilling is also reduced. However, in the monitoring process of the choke manifold and the kill manifold, the sound waves can reach the monitored liquid level only through four right angles, so that the propagation and reflection of the sound waves are weakened, the monitoring precision is reduced, the actual change condition of the drilling fluid is further influenced to a great extent, and the installation position of the liquid level monitor is very important.
Besides the defects of the existing liquid level monitor on the installation position, when the liquid level monitor is used for monitoring the change of drilling fluid, the pressure difference between the inside and the outside of a shaft is overlarge, and harmful gas in the shaft overflows, so that well control safety accidents are easily caused; when the liquid level monitor monitors at intervals, potential safety hazards in the process of unmonitored time cannot be found; in addition, during the process of monitoring the drilling fluid by the fluid level monitor, the drilling fluid may enter the fluid level monitor to cause damage to the instrument.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a drilling fluid level monitor conversion device and a fluid level monitoring method thereof, which can realize safe and reliable connection of a monitor and a wellhead, effectively control the pressure difference inside and outside a shaft and the overflow of harmful gas, improve the fluid level monitoring precision, and have the advantages of simple structure, convenient installation and operation, safety, high efficiency and strong practicability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a drilling liquid level monitor conversion device comprises an upper connector 2 and a pressure-bearing stop valve 12, wherein the top of the upper connector 2 is provided with an internal thread connected with a liquid level monitor 1, and the bottom of the upper connector 2 is connected with an internal thread at the top end of an upper end cover 3 of the pressure-bearing stop valve 12 through an external thread;
the bottom end of the upper end cover 3 is in threaded connection with one end of the valve body 5, and the other end of the valve body 5 is fixedly connected with a casing head pressure gauge overlock 11; be equipped with valve ball 7 in the valve body 5, be equipped with fluid passage in the middle of the valve ball 7, valve ball 7 and valve rod 15's one end fixed connection, the valve ball 7 outside and valve rod 15 periphery are overlapped from inside to outside in proper order and are equipped with sealing rubber pad 9, gasket 17 and gland 8, and it has packing 16 to fill between gasket 17 and the gland 8 bottom, and hexagon bolt 14 and valve body 5 fixed connection and compaction packing 16 are passed through at the gland 8 top, and the other end of valve rod 15 and handle 6 fixed connection.
And a pressure relief liquid discharge hole 4 is formed in the upper end cover 3, and a screw 13 is arranged in the pressure relief liquid discharge hole 4.
The filler 16 is made of flexible graphite.
The liquid level monitoring method based on the drilling liquid level monitor conversion device specifically comprises the following steps:
the method comprises the following steps: connecting and fastening an upper connector 2 of the conversion device of the drilling liquid level monitor with a liquid level monitor 1, and then connecting a valve body 5 of a pressure-bearing stop valve with a cocker part 11 of a pressure gauge; the pressure gauge overlock 11 of the conversion device of the drilling fluid level monitor is connected with a shaft through a valve 18 at the casing head, and an annular blowout preventer 19 is arranged at the inlet and outlet of the shaft;
step two: stopping drilling, and simultaneously closing the annular blowout preventer 19 at the inlet and the outlet of the oil well to ensure that the liquid level of the shaft annulus is in a sealed state in the liquid level monitoring process;
step three: opening a valve 18 at the casing head, communicating a drilling fluid level monitor 1 with a channel of the shaft annulus fluid level, then opening a pressure relief liquid discharge hole 4, discharging the gas liquid remained in the pressure-bearing stop valve 12, and then closing the pressure relief liquid discharge hole 4;
step four: rotating a handle 6, opening a pressure-bearing stop valve 12, opening a valve ball 7 channel, then opening a liquid level monitor 1 and liquid level monitor control software, then clicking a 'start' button in the liquid level monitor control software, driving nitrogen into the annular liquid level of the shaft until the pressure in the shaft is 1.2-2.0Mpa, and calculating the annular liquid level depth through sound wave reflection time and air speed; after monitoring for 20 seconds, reversely rotating the handle 6, closing the pressure-bearing stop valve 12, and reading the depth data of the liquid level of the well barrel on the control software interface of the liquid level monitor 1; the initial interval time is 10-30 min/time, the liquid level rises less than 5m or falls less than 3m, the liquid level is in a stable state, and the interval is adjusted to 1 h/time after the liquid level is stable; if the liquid level rises to be more than 5m and the liquid level drops to be more than 3m, reporting to personnel in a drilling team in time, and if the liquid level changes to be more than 30m, setting the interval time to be 5-20 min; if the liquid level depth is less than 300m or an overflow leakage well appears during well drilling and completion, the interval time is less than or equal to 30 min;
step five: after the fourth step is finished, closing the valve 18 at the casing head, opening the pressure relief liquid discharge hole 4, and discharging drilling fluid possibly remaining in the pressure-bearing stop valve 12;
step six: and closing the liquid level monitor, and finishing the primary liquid level monitoring.
The invention has the beneficial effects that:
in the technical aspect, when liquid level monitoring is carried out, the pressure-bearing stop valve 12 can effectively control the pressure difference inside and outside the shaft and the overflow of harmful gas, so that safety accidents are avoided; the liquid level monitor 1 needs to monitor intermittently, and the pressure-bearing stop valve 12 is closed, so that the safety of a well head when not monitored can be ensured; the upper end cover 3 of the pressure-bearing stop valve 12 is provided with a pressure relief liquid discharge hole 4, before monitoring, the pressure in the shaft can be relieved by opening the pressure relief liquid discharge hole 4, the precision of the liquid level monitor is improved, and drilling fluid entering the liquid level monitor can be discharged by opening the pressure relief liquid discharge hole 4 after monitoring, so that the liquid level monitor is protected from being damaged; the filler used by the traditional pressure-bearing stop valve is polytetrafluoroethylene, the service life of the filler is short, the sealing performance is poor, the filler 16 arranged in the valve body 5 is made of flexible graphite, and the filler has the characteristics of high temperature resistance, long service life, corrosion resistance and excellent impermeability to gas and liquid and can prevent the gas and liquid from seeping out of the filler; in addition, the traditional pressure-bearing stop valve has poor sealing performance, and the packing gland 8 is fixedly connected with the valve body 5 through the hexagon bolt 14, so that the pressure-bearing capacity and the sealing performance of the pressure-bearing stop valve 12 are improved; the sealing rubber gaskets 9, the gaskets 7 and the packing 16 are arranged, so that the sealing performance of pressure bearing stop is improved, and gas and liquid are prevented from flowing out of the packing.
In the aspect of improving the monitoring precision of the liquid level monitor, in the monitoring process, the liquid level monitor 1 is connected with a cocker part 11 of a sleeve head pressure gauge, sound waves can directly enter a shaft, the defect that the sound waves can reach the monitored liquid level only through a plurality of right angles at a kill manifold and a throttle manifold is overcome, and the monitoring precision is reduced due to the fact that the sound waves are transmitted and reflected.
In conclusion, the invention has the advantages of simple structure, convenient installation and operation, safety, high efficiency and strong practicability.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of the pressure-bearing stop valve of the invention.
Fig. 3 is a schematic view of the superstructure 2 of the present invention.
Fig. 4 is a schematic view of the construction of the packing gland 8 of the present invention.
Fig. 5 is a schematic view of the installation position of the device of the present invention.
In the figure: 1. a liquid level monitor; 2. an upper joint; 3. an upper end cap; 4. a pressure relief liquid discharge hole; 5. a valve body; 6. a handle; 7. a valve ball; 8. a packing gland; 9. sealing the rubber pad; 10. a seal ring; 11. a sleeve head pressure gauge is used for cocking; 12. a pressure-bearing stop valve; 13. a screw; 14. a hexagon bolt; 15. a valve stem; 16. a filler; 17. a gasket; 18. a valve at the casing head; 19. an annular blowout preventer.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 3, a drilling liquid level monitor conversion device comprises an upper joint 2 and a pressure-bearing stop valve 12, wherein an internal thread connected with a liquid level monitor 1 is arranged at the top of the upper joint 2, and the bottom of the upper joint 2 is connected with an internal thread at the top end of an upper end cover 3 of the pressure-bearing stop valve 12 through an external thread.
Referring to fig. 1, 2 and 4, the bottom end of the upper end cover 3 is in threaded connection with one end of the valve body 5, and the other end of the valve body 5 is fixedly connected with a casing head pressure gauge 11; be equipped with valve ball 7 in the valve body 5, be equipped with fluid passage in the middle of the valve ball 7, valve ball 7 and valve rod 15's one end fixed connection, the valve ball 7 outside and valve rod 15 periphery are overlapped from inside to outside in proper order and are equipped with sealing rubber pad 9, gasket 17 and gland 8, it has packing 16 to fill between gasket 17 and the gland 8 bottom, improves the bearing capacity and the leakproofness of pressure-bearing stop valve, hexagon bolt 14 and valve body 5 fixed connection and compaction packing 16 are passed through at gland 8 top, the other end of valve rod 15 and handle 6 fixed connection.
The upper end cover 3 is provided with a pressure relief liquid discharge hole 4, and a screw 13 is arranged in the pressure relief liquid discharge hole 4, so that pressure relief and liquid discharge are facilitated in the liquid level monitoring process, the liquid level monitoring precision is improved, and the liquid level monitor is protected from damage.
The filler 16 is made of flexible graphite, is resistant to high temperature and corrosion, has excellent impermeability to gas and liquid, and prevents the gas and liquid from seeping out of the filler.
Referring to fig. 5, the liquid level monitoring method based on the conversion device of the drilling liquid level monitor specifically comprises the following steps:
the method comprises the following steps: connecting and fastening an upper connector 2 of the conversion device of the drilling liquid level monitor with a liquid level monitor 1, and then connecting a valve body 5 of a pressure-bearing stop valve with a cocker part 11 of a pressure gauge; the pressure gauge overlock 11 of the conversion device of the drilling fluid level monitor is connected with a shaft through a valve 18 at the casing head, and an annular blowout preventer 19 is arranged at the inlet and outlet of the shaft;
step two: stopping drilling, and simultaneously closing the annular blowout preventer 19 at the inlet and the outlet of the oil well to ensure that the liquid level of the shaft annulus is in a sealed state in the liquid level monitoring process;
step three: opening a valve 18 at the casing head, communicating a drilling fluid level monitor 1 with a channel of the shaft annulus fluid level, then opening a pressure relief liquid discharge hole 4, discharging the gas liquid remained in the pressure-bearing stop valve 12, and then closing the pressure relief liquid discharge hole 4;
step four: turning a handle 6, opening a pressure-bearing stop valve 12, opening a valve ball 7 channel, then opening a liquid level monitor 1 and liquid level monitor control software, then clicking a 'start' button in the liquid level monitor control software, driving nitrogen into the annular liquid level of the shaft until the pressure in the shaft is 1.2-2.0Mpa, calculating the annular liquid level depth through sound wave reflection time and air speed, turning the handle 6 reversely after 20 seconds, closing the pressure-bearing stop valve 12, and reading the depth data of the shaft liquid level on a control software interface of the liquid level monitor 1; the initial interval time is 10-30 min/time, the liquid level rises less than 5m or falls less than 3m, the liquid level is in a stable state, and the interval time is adjusted to 1 h/time after the liquid level is stable; if the liquid level rises to be more than 5m and the liquid level drops to be more than 3m, reporting to personnel in a drilling team in time, and if the liquid level changes to be more than 30m, keeping the interval for 5-20 min; if the liquid level depth is less than 300m or an overflow leakage well appears during well drilling and completion, the interval time is less than or equal to 30 min;
step five: after the fourth step is finished, closing the valve 18 at the casing head, opening the pressure relief liquid discharge hole 4, and discharging drilling fluid possibly remaining in the pressure-bearing stop valve 12;
step six: and closing the liquid level monitor, and finishing the primary liquid level monitoring.
The working principle of the invention is as follows:
before liquid level monitoring, the liquid level monitor 1 is connected with a cocker 11 of a sleeve head pressure gauge through the device, a pressure relief liquid discharge hole 4 is opened, drilling fluid and gas in a shaft are discharged, the phenomenon that in the liquid level monitoring process, the air pressure and the drilling fluid in the shaft influence the transmission and reflection of sound waves of the liquid level monitor, so that the monitoring precision is influenced is prevented, and then the pressure relief exhaust hole is closed; next, the well team is required to stop working, the annular blowout preventer 19 is closed, and the pressure-bearing stop valve 12 and the liquid level monitor 1 are opened for monitoring; in order to ensure accurate monitoring precision, intermittent monitoring is required, and in the intermittent monitoring process, the pressure-bearing stop valve 12 needs to be closed all the time, so that the safety of a wellhead can be ensured when the wellhead is not monitored; after monitoring is finished, reading data; and finally, closing the monitor and finishing monitoring.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention should be defined by the claims.
Claims (4)
1. The utility model provides a drilling liquid level monitor conversion equipment which characterized in that: the device comprises an upper joint (2) and a pressure-bearing stop valve (12), wherein the top of the upper joint (2) is connected with a liquid level monitor (1) through an internal thread, and the bottom of the upper joint (2) is connected with an internal thread at the top end of an upper end cover (3) of the pressure-bearing stop valve (12) through an external thread;
the bottom end of the upper end cover (3) is in threaded connection with one end of the valve body (5), and the other end of the valve body (5) is fixedly connected with a casing head pressure gauge overlock (11); be equipped with valve ball (7) in valve body (5), be equipped with fluid passage in the middle of valve ball (7), the one end fixed connection of valve ball (7) and valve rod (15), the cover is equipped with sealing rubber pad (9) from inside to outside in proper order in valve ball (7) outside and valve rod (15) periphery, gasket (17) and gland (8), it has packing (16) to fill between gasket (17) and gland (8) bottom, hexagon bolt (14) and valve body (5) fixed connection and compaction packing (16) are passed through at gland (8) top, the valve rod (15) other end and handle (6) fixed connection. .
2. The drilling fluid level monitor conversion device of claim 1, wherein: and a pressure relief liquid discharge hole (4) is formed in the upper end cover (3), and a screw (13) is arranged in the pressure relief liquid discharge hole (4).
3. The drilling fluid level monitor conversion device of claim 1, wherein: the filler (16) is made of flexible graphite.
4. The liquid level monitoring method based on the conversion device of the drilling liquid level monitor of any one of claims 1 to 3 comprises the following steps:
the method comprises the following steps: an upper joint (2) of a conversion device of the drilling liquid level monitor is connected and fastened with a liquid level monitor (1), and then a valve body (5) of a pressure-bearing stop valve is connected with a overlock part (11) of a pressure gauge; a pressure gauge overlock (11) of a drilling fluid level monitor conversion device is connected with a shaft through a valve (18) at the casing head, and an annular blowout preventer (19) is arranged at an inlet and an outlet of the shaft;
step two: stopping drilling, and simultaneously closing an annular blowout preventer (19) at the inlet and the outlet of the shaft to ensure that the liquid level of the shaft annulus is in a sealed state in the liquid level monitoring process;
step three: opening a valve (18) at the casing head, communicating a drilling fluid level monitor (1) with a channel of the shaft annulus fluid level, then opening a pressure relief liquid discharge hole (4), discharging gas and liquid remained in a pressure-bearing stop valve (12), and then closing the pressure relief liquid discharge hole (4);
step four: rotating a handle (6), opening a pressure-bearing stop valve (12), opening a valve ball (7) channel, then opening a liquid level monitor (1) and liquid level monitor control software, then clicking a 'start' button in the liquid level monitor control software, driving nitrogen into the annular liquid level of the shaft until the pressure in the shaft is 1.2-2.0Mpa, calculating the annular liquid level depth through sound wave reflection time and air speed, reversely rotating the handle (6) after monitoring for 20 seconds, closing the pressure-bearing stop valve (12), and reading the depth data of the shaft liquid level on a control software interface of the liquid level monitor (1); the initial interval time is 10-30 min/time, the liquid level rises less than 5m or falls less than 3m, the liquid level is in a stable state, and the interval time is adjusted to 1 h/time after the liquid level is stable; if the liquid level rises to be more than 5m and the liquid level drops to be more than 3m, reporting to personnel in a drilling team in time, and if the liquid level changes to be more than 30m, setting the interval time to be 5-20 min; if the liquid level depth is less than 300m or an overflow leakage well appears during well drilling and completion, the interval time is less than or equal to 30 min;
step five: after the fourth step is finished, closing a valve (18) at the casing head, opening a pressure relief liquid discharge hole (4), and discharging drilling fluid possibly remaining in the pressure-bearing stop valve 12;
step six: and closing the liquid level monitor, and finishing the primary liquid level monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885857.1A CN111980679A (en) | 2020-08-28 | 2020-08-28 | Conversion device of drilling liquid level monitor and liquid level monitoring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885857.1A CN111980679A (en) | 2020-08-28 | 2020-08-28 | Conversion device of drilling liquid level monitor and liquid level monitoring method thereof |
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| CN111980679A true CN111980679A (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010885857.1A Pending CN111980679A (en) | 2020-08-28 | 2020-08-28 | Conversion device of drilling liquid level monitor and liquid level monitoring method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502695A (en) * | 2021-02-05 | 2021-03-16 | 西安海联石化科技有限公司 | Drilling liquid level and leakage monitoring method |
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| CN2212688Y (en) * | 1995-03-31 | 1995-11-15 | 北京科维仪表阀门厂 | Steel ball flap type high-pressure high-temp stop valve |
| CN102654203A (en) * | 2012-05-08 | 2012-09-05 | 宁波长壁流体动力科技有限公司 | Spherical stop valve for underground combined mining working surface of coal mine |
| CN102927309A (en) * | 2012-10-16 | 2013-02-13 | 丰隆液压有限公司 | Spherical shut-off valve |
| CN203394419U (en) * | 2013-08-07 | 2014-01-15 | 中国石油化工股份有限公司 | Multifunctional rapid connection device of wellhead |
| CN205714170U (en) * | 2016-03-23 | 2016-11-23 | 濮阳市永辉仪表有限公司 | Oil well intelligent producing fluid level monitoring device |
| CN106703789A (en) * | 2017-03-16 | 2017-05-24 | 中国石油化工股份有限公司 | Leakage well drilling fluid level and leakage pressure monitoring system and method |
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2020
- 2020-08-28 CN CN202010885857.1A patent/CN111980679A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4193449A (en) * | 1977-08-12 | 1980-03-18 | Fmc Corporation | Valve operating circuit |
| CN2212688Y (en) * | 1995-03-31 | 1995-11-15 | 北京科维仪表阀门厂 | Steel ball flap type high-pressure high-temp stop valve |
| CN102654203A (en) * | 2012-05-08 | 2012-09-05 | 宁波长壁流体动力科技有限公司 | Spherical stop valve for underground combined mining working surface of coal mine |
| CN102927309A (en) * | 2012-10-16 | 2013-02-13 | 丰隆液压有限公司 | Spherical shut-off valve |
| CN203394419U (en) * | 2013-08-07 | 2014-01-15 | 中国石油化工股份有限公司 | Multifunctional rapid connection device of wellhead |
| CN205714170U (en) * | 2016-03-23 | 2016-11-23 | 濮阳市永辉仪表有限公司 | Oil well intelligent producing fluid level monitoring device |
| CN106703789A (en) * | 2017-03-16 | 2017-05-24 | 中国石油化工股份有限公司 | Leakage well drilling fluid level and leakage pressure monitoring system and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502695A (en) * | 2021-02-05 | 2021-03-16 | 西安海联石化科技有限公司 | Drilling liquid level and leakage monitoring method |
| 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 |
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Inventor after: Qu Wentao Inventor after: Wang Zhi Inventor after: Yan Hao Inventor after: Duan Hangbo Inventor after: Duan Bing Inventor after: Zhang Bowen Inventor after: Guo Yixiao Inventor before: Qu Wentao Inventor before: Wang Zhi Inventor before: Lv Zhao Inventor before: Guo Yixiao Inventor before: Yan Hao Inventor before: Duan Hangbo Inventor before: Ren Jiaojiao Inventor before: Zhang Bowen Inventor before: Shi Xiaoxiao |
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