CN114427446B - Underground pressure monitoring device and method for petroleum production - Google Patents
Underground pressure monitoring device and method for petroleum production Download PDFInfo
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- CN114427446B CN114427446B CN202210355292.5A CN202210355292A CN114427446B CN 114427446 B CN114427446 B CN 114427446B CN 202210355292 A CN202210355292 A CN 202210355292A CN 114427446 B CN114427446 B CN 114427446B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012806 monitoring device Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title description 8
- 239000003208 petroleum Substances 0.000 title description 7
- 230000006698 induction Effects 0.000 claims abstract description 61
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 53
- 238000012546 transfer Methods 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 12
- 239000003129 oil well Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- 230000006837 decompression Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims 2
- 210000002445 nipple Anatomy 0.000 claims 2
- 230000008447 perception Effects 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 230000036961 partial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to an oil exploitation auxiliary system and method, in particular to an underground pressure monitoring device and method for oil exploitation. The technical scheme is as follows: the bottom of the process pipe column is provided with a monitoring early warning device, the upper part of the process pipe column is provided with a signal terminal receiver, the upper end of a system carrier of the monitoring early warning device is connected with the lower end of the blind plug, a pressure limiting carrier, an induction protection block and a sensor are sequentially arranged in an inner cavity of the system carrier, the lower end of the system carrier is provided with a limiting cover plate, the middle part of the induction protection block is provided with an induction contact and a sensing support spring, and the upper end of the induction contact is electrically connected with the sensor. The beneficial effects are that: the pressure signal and the blowout signal of the stratum are converted into electric signals by using the sensor, the stratum change in the well is transmitted to the ground in a wireless electromagnetic wave mode, and due to the fact that the transmission speed of the electromagnetic wave is high, personnel on the ground have time to rapidly start an emergency treatment scheme and rapidly evacuate and avoid risks, and casualties and partial property loss are reduced.
Description
Technical Field
The invention relates to an oil exploitation auxiliary system and method, in particular to an underground pressure monitoring device and method for oil exploitation.
Background
In the oil exploitation, the pressure in the oil well is high due to stratum reasons, which brings difficulty to the exploitation operation, therefore, people design a way of operation under pressure, that is, when the pressure in the oil well is high, the exploitation related operation is carried out. Because the stratum pressure of some oil wells is large and the elastic energy in the oil reservoir is sufficient, the lower pipe column has a suction effect on the stratum in the pressure-bearing operation process, and therefore the blowout phenomenon can be caused. When the blowout occurs in the process of oil exploitation, the loss of field workers and the heavy loss of property are easily caused, so that the monitoring and early warning of the accidental blowout are very necessary in the process of the operation under pressure. The invention relates to an underground pressure monitoring device and method for petroleum production, which aim to solve the problem.
Disclosure of Invention
The invention aims to provide a device and a method for monitoring underground pressure in petroleum production, aiming at the defects in the prior art, a pressure signal and a blowout signal of a stratum are converted into electric signals by using a sensor, the stratum change in the well is transmitted to the ground in a wireless electromagnetic wave mode, and personnel on the ground have time to quickly start an emergency treatment scheme and quickly evacuate and avoid risks due to the high transmission speed of the electromagnetic wave, so that casualties and part of property loss are reduced.
The invention provides an underground pressure monitoring device for petroleum production, which adopts the technical scheme that: the device comprises an artificial well bottom, a perforation layer, a casing, a working device, a process pipe column, a first connecting bolt, a compensation pipe column, a well mouth connecting short section, an upper blowout preventer and a lower blowout preventer, wherein the process pipe column is installed in an inner cavity of the casing, the lower blowout preventer is installed at the upper end of the well mouth connecting short section, the upper part of the lower blowout preventer is connected with the compensation pipe column through a hanger, the upper part of the compensation pipe column is provided with a half seal, a full seal and a self seal, a blind plug is installed at the bottom of the process pipe column, a monitoring early warning device is installed at the lower end of the blind plug, a signal transfer station is installed in the middle of the process pipe column, a signal terminal receiver is also installed at the upper part of the compensation pipe column, the monitoring early warning device comprises a limit cover plate, a constant pressure shear pin, a pressure limiting carrier, a system carrier, a pressure reducing spring, a pressure transmitting sealing piston, an induction contact, a sensing support spring, a sensor and an induction protection block, the upper end of the system carrier is movably connected at the lower end of the blind plug, the pressure limiting device comprises a pressure limiting carrier, an induction protection block and a sensor, wherein the pressure limiting carrier, the induction protection block and the sensor are sequentially arranged in an inner cavity of the system carrier, a limiting cover plate is arranged at the lower end of the system carrier, an induction contact and a sensing support spring are arranged in the middle of the induction protection block, the upper end of the induction contact is electrically connected with the sensor, acquired pressure data are transmitted to the sensor for processing, the lower end of the induction contact is in contact with the upper end of a pressure transmitting sealing piston, the induction contact acquires the pressure data of the pressure transmitting sealing piston, the lower end of the pressure transmitting sealing piston is arranged in the middle of the pressure limiting carrier through a constant pressure shear pin, a pressure reducing spring is arranged on the outer side of the lower end of the pressure transmitting sealing piston, a pressure transmitting hole is arranged in the center of the limiting cover plate, pressure is transmitted through the pressure transmitting hole, and the pressure limiting carrier moves under the action of the pressure and drives the pressure transmitting sealing piston to move.
Preferably, the induction protection block is provided with a plurality of danger avoiding starting rods, the upper ends of the danger avoiding starting rods are inserted into the inner cavity of the induction protection block, the lower ends of the danger avoiding starting rods extend out by 10-30 mm, and the upper end parts of the danger avoiding starting rods are connected with the early warning striker.
Preferably, the upper end of the inner cavity of the system carrier is provided with a step, a sensor is arranged in a small-diameter cavity formed by the step, and the lower surface of the step is in contact with the cylindrical induction protection block.
Preferably, the above-mentioned limit cover plate is connected to the blind plug through the outside of the system carrier by a plurality of second connecting bolts.
Preferably, the cross section of the pressure transmission sealing piston is of an inverted T-shaped structure, the middle cavity of the pressure limiting carrier is of a cylindrical structure, a through hole is formed in the top of the cavity of the cylindrical structure, and the inner diameter of the through hole is smaller than that of the cavity of the cylindrical structure and larger than the outer diameter of the rod of the pressure transmission sealing piston.
Preferably, the pressure relief spring is located in the cavity of the cylindrical structure of the pressure limiting carrier, and the bottom seat is located at the inverted T-shaped structure of the pressure transmitting sealing piston.
Preferably, the middle part of the induction protection block is provided with an installation cavity, an induction contact and a sensing support spring are installed in the installation cavity, the sensing support spring is installed on the upper side of the induction contact, the top of the installation cavity is provided with an upper connecting hole, and the induction contact is communicated with the sensor through a connecting wire.
Preferably, the signal transfer station comprises a receiver, a signal protection carrier, a coupling main body, a signal amplifier, a signal transmitter, an upper end supporting block and a lower end supporting block, wherein the signal protection carrier is arranged on the outer side of the coupling main body, the lower end supporting block, the signal amplifier and the upper end supporting block are sequentially arranged in a protection cavity formed between the signal protection carrier and the coupling main body from bottom to top, the receiver is arranged in the lower end supporting block, and the signal transmitter is arranged in the upper end supporting block.
The invention provides a using method of an underground pressure monitoring device for petroleum production, which comprises the following steps:
firstly, the monitoring early-warning device is assembled on the ground, and is connected to the bottom of a process pipe column, and then is placed into a casing pipe, because the pressure in the initial oil well is stable, namely under the condition of normal operation under pressure, the pressure in the oil well is transmitted to the bottoms of a pressure limiting carrier and a pressure transmitting sealing piston through a pressure transmitting hole, a constant pressure shear pin is not sheared, the pressure limiting carrier and the pressure transmitting sealing piston move along the inner cavity of a system carrier together to drive the pressure transmitting sealing piston to contact and extrude an induction contact, the induction contact acquires pressure data in a stable range and transmits an electric signal to a sensor, the sensor stores the obtained electric signal and sends the signal in an electromagnetic wave form, a plurality of signal transfer stations are arranged according to different lengths of underground distances, after the underground signal is transmitted to the signal transfer stations, the signal is amplified and then transmitted to the ground, and the signal received by a signal terminal receiver on the ground is connected to a display, so as to clearly obtain the pressure information in the well;
when a blowout phenomenon occurs, the pressure of the perforation layer is rapidly raised, so that the pressure of the sleeve is rapidly increased, at the moment, the rapidly increased pressure is transmitted to the bottoms of the pressure limiting carrier and the pressure transmitting sealing piston through the pressure transmitting hole, the pressure limiting carrier and the pressure transmitting sealing piston continue to extrude the induction contact to move upwards and extrude the sensing support spring until the upper surface of the pressure limiting carrier impacts the danger avoiding starting rod, the danger avoiding starting rod drives the early warning striker at the upper end part to be connected to the starting switch arranged on the sensor after being impacted, the alarm signal of the blowout is transmitted to the ground through the sensor, and personnel on the ground rapidly start an emergency disposal scheme after receiving the alarm signal of the blowout, and then rapidly evacuate workers at the wellhead;
and in addition, when the danger-avoiding starting rod is impacted, the constant-pressure shear pin is sheared under the action of sharply increased pressure, and the pressure transmission sealing piston reduces the extrusion force on the induction contact under the pressure reduction action of the pressure reduction spring, so that the induction contact is protected.
Compared with the prior art, the invention has the following beneficial effects:
under the condition of normal operation under pressure, the pressure in the oil well is transmitted to the bottoms of the pressure limiting carrier and the pressure transmitting sealing piston through the pressure transmitting hole, the constant pressure shear pin is not sheared, the pressure limiting carrier and the pressure transmitting sealing piston move along the inner cavity of the system carrier together to drive the pressure transmitting sealing piston to contact and extrude the sensing contact, the sensing contact acquires pressure data in a stable range and transmits an electric signal to the sensor, the sensor stores the acquired electric signal and sends the electric signal in an electromagnetic wave form, and the electric signal is amplified through more than one-stage signal transfer station and then transmitted to the ground for monitoring;
when a blowout phenomenon occurs, the pressure sharply increased in the oil well is transmitted to the bottoms of the pressure limiting carrier and the pressure transmitting sealing piston through the pressure transmitting hole, the pressure limiting carrier and the pressure transmitting sealing piston continue to extrude the induction contact to move upwards to extrude the sensing support spring until the upper surface of the pressure limiting carrier impacts the danger avoiding starting rod, the danger avoiding starting rod drives the early warning striker at the upper end part to be connected to a starting switch arranged on the sensor after being impacted, an alarm signal of the blowout is transmitted to the ground through the sensor, and after a person on the ground receives the alarm signal of the blowout, an emergency disposal scheme is quickly started, and then the evacuation of workers at the wellhead is quickly realized; meanwhile, the lower end of the danger avoiding starting rod supports the pressure limiting carrier to avoid crushing the induction contact and the sensor part;
in addition, after the constant-pressure shear pin is sheared by high pressure, the pressure transmission sealing piston reduces the extrusion force on the induction contact under the decompression action of the decompression spring, and the protection on the induction contact and the sensor is realized; the invention realizes the functions of monitoring, early warning and protection under the underground high-pressure environment; moreover, ground personnel have time to rapidly start an emergency disposal scheme and rapidly evacuate and avoid risks, and casualties and partial property loss are reduced.
Drawings
FIG. 1 is a schematic illustration of the construction of the downhole portion of the present invention;
FIG. 2 is an overall schematic view of the aboveground portion of the present invention;
FIG. 3 is a schematic representation of the structure of the tubing string of the aboveground portion of the present invention;
FIG. 4 is a schematic diagram of a monitoring alarm;
FIG. 5 is a bottom view of the monitoring precaution;
fig. 6 is a schematic structural view of the signal transfer station;
in the upper diagram: the system comprises an artificial well bottom 100, a perforation layer 200, a casing 300, a monitoring early warning device 400, a working device 500, a process pipe column 600, a signal transfer station 700, a first connecting bolt 800, a compensation pipe column 900, a limit cover plate 1, a constant pressure shear pin 2, a pressure limiting carrier 3, a system carrier 4, a blind plug 5, a receiver 6, a signal protection carrier 7, a coupling main body 8, a signal amplifier 9, a signal transmitter 10, a lower blowout preventer 11, a hanger 12, a signal terminal receiver 13, a half seal 14, a full seal 15, a self seal 16, a second connecting bolt 17, a pressure reducing spring 18, a pressure transmitting sealing piston 19, an induction contact 20, a danger avoiding starting rod 21, a sensing supporting spring 22, a sensor 23, a sensing protecting block 24, a pressure transmitting hole 25, a wellhead connecting short section supporting block 26, an upper blowout preventer 27, an upper end 701, a lower end supporting block 702 and an early warning firing pin 21.1.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to fig. 4, specifically, the induction protection block 24 is provided with a plurality of danger avoiding starting rods 21, the upper ends of the danger avoiding starting rods 21 are inserted into the inner cavity of the induction protection block 24, the lower ends of the danger avoiding starting rods 21 extend out by 10-30 mm, and the upper ends of the danger avoiding starting rods 21 are connected with the early warning striker 21.1.
In addition, the upper end of the inner cavity of the system carrier 4 is provided with a step, a small-diameter cavity formed by the step is used for installing the sensor 23, and the lower surface of the step is in contact with the cylindrical induction protection block 24.
The above-mentioned stop cover 1 is connected to the blind plug 5 by means of a plurality of second connecting bolts 17 through the outside of the system carrier 4.
The cross section of the pressure transmission sealing piston 19 is of an inverted T-shaped structure, the middle cavity of the pressure limiting carrier 3 is of a cylindrical structure, a through hole is formed in the top of the cavity of the cylindrical structure, and the inner diameter of the through hole is smaller than that of the cavity of the cylindrical structure and larger than the outer diameter of the rod part of the pressure transmission sealing piston 19.
Wherein, the pressure reducing spring 18 is positioned in the cavity of the cylindrical structure of the pressure limiting carrier 3, and the bottom seat is positioned at the inverted T-shaped structure of the pressure transmitting sealing piston 19.
Referring to fig. 4, the middle of the induction protection block 24 of the present invention is provided with an installation cavity for installing the induction contact 20 and the sensing support spring 22, the sensing support spring 22 is installed on the upper side of the induction contact 20, and the top of the installation cavity is provided with an upper connection hole for connecting the induction contact 20 and the sensor 23 through a connection line.
Referring to fig. 6, the signal transfer station 700 of the present invention includes a receiver 6, a signal protection carrier 7, a coupling body 8, a signal amplifier 9, a signal transmitter 10, an upper end support block 701, and a lower end support block 702, wherein the signal protection carrier 7 is installed on the outer side of the coupling body 8, the lower end support block 702, the signal amplifier 9, and the upper end support block 701 are sequentially installed in a protection cavity formed between the signal protection carrier 7 and the coupling body 8 from bottom to top, the receiver 6 is installed in the lower end support block 702, and the signal transmitter 10 is installed in the upper end support block 701.
In addition, the above mentioned working device 500 is a hydraulic switch or a bypass device or other working devices in the oil production well, and is an existing conventional device, and will not be described in detail; the upper blowout preventer 27, the lower blowout preventer 11, the half seal 14, the full seal 15, the self seal 16 and the like are common tools in the existing oil exploitation and are not described in detail.
The invention provides a using method of an underground pressure monitoring device for petroleum production, which comprises the following steps:
firstly, the monitoring early warning device 400 is assembled on the ground, connected to the bottom of a process string 600 and then lowered into a casing 300, because the pressure in the initial oil well is stable, namely under the condition of normal operation under pressure, the pressure in the oil well is transmitted to the bottoms of a pressure limiting carrier 3 and a pressure transmitting sealing piston 19 through a pressure transmitting hole 25, a constant pressure shear pin 2 is not sheared, the pressure limiting carrier 3 and the pressure transmitting sealing piston 19 move together along the inner cavity of a system carrier 4 to drive the pressure transmitting sealing piston 19 to contact and press an induction contact 20, the induction contact 20 acquires pressure data in a stable range and transmits an electric signal to a sensor 23, the sensor 23 stores the acquired electric signal and transmits the electric signal in the form of electromagnetic wave, a plurality of signal transfer stations 700 are arranged according to the length of the distance under the well, after the signal under the well is transmitted to the signal transfer stations 700, amplifying and then transmitting to the ground, wherein signals received by a signal terminal receiver 13 on the ground are connected to a display so as to clearly obtain pressure information underground;
secondly, when a blowout phenomenon occurs, the pressure of the perforation layer 200 is rapidly increased, so that the pressure of the casing 300 is rapidly increased, at the moment, the rapidly increased pressure is transmitted to the bottoms of the pressure limiting carrier 3 and the pressure transmitting sealing piston 19 through the pressure transmitting hole 25, the pressure limiting carrier 3 and the pressure transmitting sealing piston 19 continue to extrude the induction contact 20 to move upwards, the sensing support spring 22 is extruded until the upper surface of the pressure limiting carrier 3 impacts the danger avoiding starting rod 21, the danger avoiding starting rod 21 drives the early warning striker 21.1 at the upper end part to be connected to the starting switch arranged on the sensor 23 after being impacted, the warning signal of the blowout is transmitted to the ground through the sensor 23, after the personnel on the ground receives the warning signal of the blowout, an emergency disposal scheme is rapidly started, namely, the half seal 14 is rapidly closed, if the conditions allow the whole pipe column to be lowered below the full seal 15, and the full seal 15 is closed for later-stage treatment, and the workers can escape from the working site in an emergency;
in addition, when the danger avoiding starting rod 21 is impacted, the constant-pressure shear pin 2 is sheared under the action of the sharply increased pressure, and the pressure transmission sealing piston 19 reduces the extrusion force on the sensing contact 20 under the decompression action of the decompression spring 18, so that the sensing contact 20 is protected.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, the technical solution according to the present invention is subject to corresponding simple modifications or equivalent changes, as far as the scope of the present invention is claimed.
Claims (9)
1. The utility model provides an oil recovery downhole pressure monitoring device, including artificial shaft bottom (100), perforation layer (200), sleeve pipe (300), worker (500), technology tubular column (600), first connecting bolt (800), compensation tubular column (900), well head coupling nipple (26), go up preventer (27) and lower preventer (11), inner chamber installation technology tubular column (600) of sleeve pipe (300), preventer (11) under well head coupling nipple (26) upper end installation, preventer (12) connection compensation tubular column (900) are passed through on lower preventer (11) upper portion, half (14) of upper portion installation of compensation tubular column (900), full seal (15) and self-sealing (16), characterized by: the bottom of a process pipe column (600) is provided with a blind plug (5), the lower end of the blind plug (5) is provided with a monitoring early warning device (400), the middle part of the process pipe column (600) is provided with a signal transfer station (700), the upper part of a compensation pipe column (900) is also provided with a signal terminal receiver (13), the monitoring early warning device (400) comprises a limit cover plate (1), a constant pressure shear pin (2), a pressure limiting carrier (3), a system carrier (4), a pressure reducing spring (18), a pressure transmitting sealing piston (19), an induction contact (20), a sensing support spring (22), a sensor (23) and an induction protection block (24), the upper end of the system carrier (4) is movably connected with the lower end of the blind plug (5), the inner cavity of the system carrier (4) is sequentially provided with the pressure limiting carrier (3), the induction protection block (24) and the sensor (23), and the lower end of the system carrier (4) is provided with the limit cover plate (1), the pressure limiting device is characterized in that an induction contact (20) and a sensing support spring (22) are arranged in the middle of an induction protection block (24), the upper end of the induction contact (20) is electrically connected with a sensor (23), acquired pressure data are transmitted to the sensor (23) to be processed, the lower end of the induction contact (20) is in contact with the upper end of a pressure transmitting sealing piston (19), the induction contact (20) acquires the pressure data of the pressure transmitting sealing piston (19), the lower end of the pressure transmitting sealing piston (19) is installed in the middle of a pressure limiting carrier (3) through a constant pressure shear pin (2), a pressure reducing spring (18) is installed on the outer side of the lower end of the pressure transmitting sealing piston (19), a pressure transmitting hole (25) is formed in the center of a limiting cover plate (1), pressure is transmitted through the pressure transmitting hole (25), and the pressure limiting carrier (3) moves under the action of the pressure and drives the pressure transmitting sealing piston (19) to move.
2. An oil recovery downhole pressure monitoring device according to claim 1, wherein: the induction protection block (24) is provided with a plurality of danger avoiding starting rods (21), the upper ends of the danger avoiding starting rods (21) are inserted into the inner cavity of the induction protection block (24), the lower ends of the danger avoiding starting rods (21) extend out by 10-30 mm, and the upper end parts of the danger avoiding starting rods (21) are connected with the early warning striker (21.1).
3. An oil recovery downhole pressure monitoring device according to claim 2, wherein: the upper end of the inner cavity of the system carrier (4) is provided with a step, a sensor (23) is arranged in a small-diameter cavity formed by the step, and the lower surface of the step is in contact with a cylindrical induction protection block (24).
4. An oil recovery downhole pressure monitoring device according to claim 3, wherein: the limiting cover plate (1) penetrates through the outer side of the system carrier (4) through a plurality of second connecting bolts (17) and is connected to the blind plug (5).
5. An oil recovery downhole pressure monitoring device as defined in claim 4, wherein: the cross section of the pressure transmission sealing piston (19) is of an inverted T-shaped structure, the middle cavity of the pressure limiting carrier (3) is of a cylindrical structure, a through hole is formed in the top of the cavity of the cylindrical structure, and the inner diameter of the through hole is smaller than that of the cavity of the cylindrical structure and larger than the outer diameter of the rod part of the pressure transmission sealing piston (19).
6. An oil recovery downhole pressure monitoring device as defined in claim 5, wherein: the pressure reducing spring (18) is positioned in a cavity of the pressure limiting carrier (3) in a cylindrical structure, and the bottom of the pressure reducing spring is seated at the inverted T-shaped structure of the pressure transmitting sealing piston (19).
7. An oil recovery downhole pressure monitoring device according to claim 6, wherein: the middle part of response protection piece (24) be equipped with the installation cavity, installation response contact (20) and perception supporting spring (22) in the installation cavity, perception supporting spring (22) are installed to the upside of response contact (20), the top of installation cavity is equipped with the connecting hole, through the connecting wire with response contact (20) and sensor (23) switch-on.
8. An oil recovery downhole pressure monitoring device according to claim 7, wherein: the signal transfer station (700) comprises a receiver (6), a signal protection carrier (7), a coupling body (8), a signal amplifier (9), a signal transmitter (10), an upper end supporting block (701) and a lower end supporting block (702), wherein the signal protection carrier (7) is installed on the outer side of the coupling body (8), the lower end supporting block (702), the signal amplifier (9) and the upper end supporting block (701) are sequentially installed in a protection cavity formed between the signal protection carrier (7) and the coupling body (8) from bottom to top, the receiver (6) is installed in the lower end supporting block (702), and the signal transmitter (10) is installed in the upper end supporting block (701).
9. Use of an oil recovery downhole pressure monitoring device according to claim 8, characterized by the process of:
firstly, a monitoring early warning device (400) is assembled on the ground and connected to the bottom of a process pipe column (600), then the monitoring early warning device is put into a casing (300), because the pressure in an initial oil well is stable, namely under the condition of normal operation under pressure, the pressure in the oil well is transmitted to the bottoms of a pressure limiting carrier (3) and a pressure transmitting sealing piston (19) through a pressure transmitting hole (25), a constant pressure shear pin (2) is not sheared, the pressure limiting carrier (3) and the pressure transmitting sealing piston (19) move together along the inner cavity of a system carrier (4) to drive the pressure transmitting sealing piston (19) to contact and extrude a sensing contact (20), the sensing contact (20) acquires pressure data in a stable range and transmits an electric signal to a sensor (23), the sensor (23) stores the acquired electric signal and transmits the electric signal in an electromagnetic wave form, and according to different lengths of underground distances, a plurality of signal transfer stations (700) are arranged, when underground signals are transmitted to the signal transfer stations (700), the signals are amplified and then transmitted to the ground, and signals received by a signal terminal receiver (13) on the ground are connected to a display so as to clearly obtain underground pressure information;
secondly, when the well blowout phenomenon occurs, the pressure of the perforation layer (200) is rapidly increased, so that the pressure of the casing (300) is sharply increased, at the moment, the sharply increased pressure is transmitted to the bottoms of the pressure limiting carrier (3) and the pressure transmitting sealing piston (19) through the pressure transmitting hole (25), the pressure limiting carrier (3) and the pressure transmitting sealing piston (19) continue to extrude the induction contact (20) to move upwards, the sensing support spring (22) is extruded until the upper surface of the pressure limiting carrier (3) impacts the danger avoiding starting rod (21), and the danger avoiding starting rod (21) drives the early warning striker (21.1) at the upper end part to be connected to a starting switch arranged on the sensor (23) after being impacted, and transmits the alarm signal of the blowout to the ground through the sensor (23), after personnel on the ground receives the alarm signal of the blowout, the emergency disposal scheme is quickly started, and then the evacuation of workers at the wellhead is quickly realized;
and in addition, when the danger avoiding starting rod (21) is impacted, the constant-pressure shear pin (2) is sheared under the action of the sharply increased pressure, and the pressure transmission sealing piston (19) reduces the extrusion force on the induction contact (20) under the decompression action of the decompression spring (18), so that the induction contact (20) is protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355292.5A CN114427446B (en) | 2022-04-06 | 2022-04-06 | Underground pressure monitoring device and method for petroleum production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210355292.5A CN114427446B (en) | 2022-04-06 | 2022-04-06 | Underground pressure monitoring device and method for petroleum production |
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| CN114427446B true CN114427446B (en) | 2022-05-31 |
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