CN108952702B - Underground sampling device for thickened oil - Google Patents
Underground sampling device for thickened oil Download PDFInfo
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- CN108952702B CN108952702B CN201811001569.4A CN201811001569A CN108952702B CN 108952702 B CN108952702 B CN 108952702B CN 201811001569 A CN201811001569 A CN 201811001569A CN 108952702 B CN108952702 B CN 108952702B
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- 238000005070 sampling Methods 0.000 title claims abstract description 61
- 238000007789 sealing Methods 0.000 claims abstract description 100
- 239000012530 fluid Substances 0.000 claims abstract description 50
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 21
- 238000012546 transfer Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a thick oil underground sampling device, a sampling tube holds a well fluid sample, a sampling hole is axially arranged at the head end joint of the sampling device, a central inner hole is axially arranged at the axial direction of a control short circuit, four sampling holes are laterally arranged at the upper section of the central inner hole of the control short circuit, a lead screw is arranged at the lower section of the central inner hole, a sealing plunger is arranged at the upper end of the lead screw, the upper end of the lead screw is connected with a micro motor, the micro motor is controlled by a circuit module to drive the lead screw to rotate forward or backward, the lead screw is driven to move up and down by forward and backward rotation of the lead screw, the sealing plunger moves up to a limit position when the lead screw rotates forward, the lower end surface of the sealing plunger is far away from the upper end surface of the sampling hole, at the moment, the fluid sample enters the inner cavity of the sampling tube through the four sampling holes, and the sealing plunger moves down to the limit position when the lead screw rotates backward, and the fluid sample in the sampling tube is sealed. The thick oil underground sampling device has the advantages of novel principle, unique structure, stable operation, simple operation, small processing difficulty, low cost, safety, environmental protection and remarkable benefit.
Description
Technical Field
The invention relates to the technical field of high-pressure physical property experiments of oil-gas field formation fluid, in particular to an underground thickened oil sampling device.
Background
The underground fluid high-pressure physical property experiment needs to collect underground high-pressure fluid samples, the existing underground sampling device mainly comprises a wall scraping type sampler, a mechanical clock type sampler and an electronic clock type sampler, an upper valve and a lower valve are adopted to seal a sample cylinder, the basic working principle is that the sample cylinder is opened on the ground in advance, the upper valve and the lower valve are arranged at the set depth underground, the fluid in the well is partially penetrated through the sample cylinder due to the flowing pressure difference between the upper end and the lower end of the sample cylinder, and flows out from the lower port and is continuously replaced and updated, when a trigger mechanism controls the upper valve and the lower valve to be closed simultaneously, the fluid is sealed in the sample cylinder, and finally the ground is put forward to be sent to a high-pressure physical property laboratory for analysis. The problem is that when the viscosity of the fluid in the well is high, the flow resistance is increased, the flow pressure difference at the two ends of the sample cylinder is insufficient to enable the fluid to flow through the sample cylinder, the obtained fluid sample is not a representative fluid sample with the set downhole depth, and the unqualified sample cannot obtain a correct analysis result; in addition, even if underground sampling is successful, problems still exist in the process of transferring fluid samples in the sample cylinder to a high-pressure experimental kettle, the viscosity ratio of saturated brine displacement fluid to thick oil is large, the phenomenon of water channeling is very easy to occur, the thick oil samples in the sample cylinder cannot be effectively displaced and transferred, the experimental analysis sample quantity is insufficient, and even once the displacement fluid is mixed into the samples, the experimental samples can be scrapped. Therefore, the straight-through type underground sampling device has simple structure and low cost, but cannot be applied to a thick oil well, particularly a carbon dioxide flooding oil reservoir, and the viscosity of the light crude oil component is increased after the light crude oil component is extracted by carbon dioxide, so that underground PVT sampling and ground sample transferring are very difficult. Therefore, the invention provides a novel thick oil underground sampling device, which solves the technical problems.
Disclosure of Invention
The invention aims to provide a thickened oil underground sampling device which effectively solves the problems of low success rate of thickened oil sampling and residual and pollution of sample conversion samples.
The aim of the invention can be achieved by the following technical measures: the utility model provides a viscous crude down-hole sampling device, this viscous crude down-hole sampling device includes a sample section of thick bamboo, the head end joint, control short circuit, sealed plunger, the lead screw, micro motor and circuit module, this sample section of thick bamboo holds well fluid sample, this head end joint axial is equipped with the sample introduction hole, the lower extreme of this head end joint is connected in this sample section of thick bamboo, the upper end is connected in this control short circuit, there are central hole the axial of this control short circuit, four sample introduction ports laterally, this lead screw is installed to the upper segment of this control short circuit central hole, this sealed plunger is installed to the lower extreme, the upper end of this lead screw is connected in this micro motor, this micro motor is connected in this circuit module, and under the control of this circuit module, drive this lead screw forward or reverse rotation, this sealed plunger upper and reciprocate, this sealed plunger upwards moves to extreme position when this lead screw forward rotation, the up end of this sealed plunger is kept away from this sample introduction hole, fluid sample passes this four sample introduction holes, this sealed plunger gets into the inner chamber of this sample section of thick bamboo when this reverse rotation, this sealed plunger then moves to extreme position.
The aim of the invention can be achieved by the following technical measures:
the sealing plunger is provided with a central through hole for balancing the pressure difference at the upper end and the lower end of the sealing plunger, the resistance of the vertical movement of the sealing plunger is furthest reduced, a trapezoidal internal thread is arranged in the central through hole and is connected with the screw rod, the screw rod is fixed with the control short circuit through a thrust bearing, the screw rod is axially rotated to drive the sealing plunger to move up and down, the screw rod is sealed by the contact of a sealing ring and the control short circuit, the upper section of the sealing plunger is a smooth sealing cylindrical surface, a sealing ring is arranged between the sealing cylindrical surface and the central internal hole wall of the control short circuit, two sealing grooves are arranged at the lower end of the sealing plunger, a rubber sealing ring is arranged at the lower end of the sealing plunger, and positioning convex edges are axially arranged at two sides of the middle section of the sealing plunger and limited by a positioning sleeve and cannot rotate.
The head end joint is laterally and symmetrically provided with a sample transferring port and a needle valve, the sample transferring port is externally connected with a high-pressure pipeline and is used for vacuumizing the inner cavity of the sample cylinder before sampling and transferring and discharging a fluid sample after sampling, the needle valve is used for closing the sample transferring port, and the diameter of a valve rod of the needle valve is far smaller than that of the sample inlet and does not form blockage to the sample inlet.
The thickened oil underground sampling device further comprises a tail end connector, the tail end connector is arranged at the lower end of the sample cylinder, a pressurizing valve and an interface are arranged in the lateral direction and are communicated with the inner cavity of the sample cylinder, the interface is externally connected with a high-pressure pipeline and is used for injecting high-pressure displacement fluid when the sample is transferred after sampling, and the pressurizing valve is used for closing the interface.
The thickened oil underground sampling device also comprises a movable plunger which is positioned at the tail end in the sample cylinder, slides axially in the sample cylinder and contacts and seals with the inner wall of the sample cylinder, high-pressure displacement fluid is injected from the interface of the tail end connector during sample transferring to drive the movable plunger to move from the tail end to the head end of the sample cylinder, and the movable plunger drives the fluid sample in the sample cylinder to be completely discharged from the sample transferring port.
The thickened oil underground sampling device further comprises a bearing sleeve, a Hall sensor and a framework, wherein the internal thread of the control short circuit is connected with the bearing sleeve, the Hall sensor is installed on a side surface opening of the bearing sleeve, the framework is sleeved on the bearing sleeve, and the circuit module and the miniature motor are fixedly installed on the framework.
The circuit module adopts a singlechip PIC16F688, and the singlechip PIC16F688 counts the rotation of the miniature motor shaft through an HR end externally connected with the Hall sensor.
The thick oil underground sampling device also comprises a non-magnetic coupling and cylindrical magnetic steel, wherein the upper end of the lead screw is connected with the rotating shaft of the miniature motor through the non-magnetic coupling, and the cylindrical magnetic steel is arranged on the side surface of the non-magnetic coupling transversely corresponding to the Hall sensor.
The thickened oil underground sampling device further comprises a battery pack and a battery barrel, wherein the outer thread at the upper end of the control short circuit is in sealing connection with the battery barrel, the battery pack is positioned in the space above the battery barrel and is connected with the circuit module, and electric power supply is provided for the circuit module and the miniature motor.
The thick oil underground sampling device adopts the electronic clock to accurately control the opening and closing of the sampling cylinder, so that the sampling at the set underground depth is easy to realize; the sealing plunger adopts a central through hole design, so that the pressure difference between two end faces of the sealing plunger can be effectively balanced, and the motor can open and close the sample cylinder only by small torque force; the principle of vacuum in the cylinder and high pressure outside the cylinder is utilized to ensure that the high-viscosity fluid can also fill the sample cylinder; the movable plunger is additionally arranged in the sample cylinder to displace the sample, so that the problems of residual and pollution of the thickened oil sample are effectively solved. The thick oil underground sampling device has the advantages of novel principle, unique structure, stable operation, simple operation, small processing difficulty, low cost, safety, environmental protection and remarkable benefit.
Drawings
FIG. 1 is a block diagram of one embodiment of a thickened oil downhole sampling apparatus of the present invention;
FIG. 2 is a circuit diagram of an internal circuit module of a heavy oil downhole sampling device according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating operation of the circuit module according to an embodiment of the present invention;
FIG. 4 is a flow chart of a ground sample transfer experiment in accordance with an embodiment of the present invention.
In fig. 1: 1. sample tube, 2, head end connector, 3, tail end connector, 4, movable plunger, 5, control short circuit, 6, sealing plunger, 7, lead screw, 8, micro motor, 9, circuit module, 10, battery tube, 11, pressurizing valve, 12, interface, 13, sample transferring port, 14, needle valve, 15, thrust bearing, 16, bearing pressing sleeve, 17, sealing ring, 18, positioning sleeve, 19, skeleton, 20, sealing ring, 21, screw, 22, sample inlet, 23, sample inlet, 24, central through hole, 25, filter screen, 26, hall sensor, 27, screw, 28, battery pack, 29, nonmagnetic coupling, 30, motor shaft, 31, magnetic steel.
In fig. 4: 401. sample tube, 402, heating jacket, 403, sample transferring pump, 404, high-pressure experimental kettle, 405, manometer, 406, sample valve, 407, ground sample transferring table, 408, high-pressure pipeline, 409, high-pressure pipeline, 410, traveling plunger, 411, pressurizing valve, 412, interface, 413, sample transferring port, 414, needle valve, 415, and pressure release valve.
Detailed Description
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
As shown in fig. 1, fig. 1 is a structural diagram of a thick oil downhole sampling device according to the present invention.
The thick oil underground sampling device consists of a sample cylinder 1, a head end connector 2, a tail end connector 3, a traveling plunger 4, a control short circuit 5, a sealing plunger 6, a screw rod 7, a miniature motor 8, a circuit module 9, a battery cylinder 10 and the like. The sample tube 1 is a metal cylinder with a smooth inner wall, the inner part and the outer part can bear high temperature and high pressure, the two ends of the sample tube 1 are respectively connected with the head end connector 2 and the tail end connector 3 in a threaded manner and sealed by rubber rings, a closed inner cavity is formed for containing a fluid sample in a well, and the movable plunger 4 is positioned at the limit position of the tail end in the sample tube 1, can axially slide in the sample tube 1 and is in contact sealing with the inner wall of the sample tube 1. The head end connector 2 is axially provided with a sample inlet 23, the diameter of the head end connector is expanded at the upper end of the head end connector and is provided with a sealing surface, the head end connector 2 is laterally and symmetrically provided with a sample rotating port 13 and a needle valve 14, the diameter of a valve rod of the needle valve 14 is far smaller than that of the sample inlet 23, the blocking of the sample inlet 23 is not formed, the sample rotating port 13 and the needle valve 14 are used for vacuumizing the sample cylinder 1 before sampling and rotating out a fluid sample after sampling, and the needle valve 14 closes the sample rotating port 13 at other times. The tail end joint 3 is laterally provided with a pressurizing valve 11 and an interface 12 which are communicated with the inner cavity of the sample cylinder 1, the pressurizing valve 11 and the interface 12 are used for injecting high-pressure displacement fluid when transferring samples, the pressurizing valve 11 closes the interface 12 at ordinary times, and the lower end of the tail end joint 3 is provided with threads for connecting a guide cone or other well tools. The upper end of the head end joint 2 is locked with the control short circuit 5 by a screw 21 in a threaded manner, the control short circuit 5 is axially provided with a central inner hole, four sample inlets 22 are laterally arranged, a screw rod 7 is installed on the upper small-diameter section of the central inner hole of the control short circuit 5, the screw rod 7 is axially fixed by a thrust bearing 15 and a bearing pressing sleeve 16 and is sealed by keeping contact between a sealing ring 20 and a shell of the control short circuit 5, the screw rod 7 is upwards connected with a rotating shaft 30 of a miniature motor through a non-magnetic coupling 29, the lower section of the screw rod 7 is provided with a trapezoidal external thread, the lower small-diameter section of the central inner hole of the control short circuit 5 is provided with a sealing plunger 6, the sealing plunger 6 is provided with a central through hole 24 and is connected with the screw rod 7 by a trapezoidal internal thread, the upper section of the sealing plunger 6 is provided with a smooth sealing cylindrical surface, a sealing ring 17 is installed between the sealing cylindrical surface and the inner hole wall of the control short circuit 5, the lower section of the sealing plunger 6 is provided with two sealing grooves and is provided with a rubber sealing ring, the middle section of the sealing plunger 6 is axially provided with positioning ribs at two sides and is limited by the positioning sleeve 18 and can not rotate, the screw rod 7 is driven to move up and down by the sealing plunger 6 when rotating forwards and reversely, the sealing plunger 16 is connected with the sealing sleeve, the inner thread is connected with the inner thread of the shaft sleeve 16 by the non-magnetic coupling, the Hall sleeve 16, the Hall sensor is provided with a magnetic coupling 16, the sealing sleeve 16 is provided with a magnetic coupling 16, the magnetic coupling is connected with a magnetic coupling sensor module 26, and a magnetic sensor module is provided with a magnetic coupling sensor module is provided with a magnetic sensor module and a magnetic coupling is provided with a magnetic coupling device, and a magnetic coupling is provided with a magnetic coupling device and a magnetic coupling. The battery pack 28 supplies power to the circuit module 9 and the micro motor 8, the circuit module 9 executes a preset program to timely control the micro motor 8 to rotate positively and reversely and monitor the rotation condition of the nonmagnetic coupling 29 through the Hall sensor 26, the micro motor 8 drives the screw rod 7 to rotate positively and reversely so as to drive the sealing plunger 6 to move up and down, when the screw rod 7 rotates positively, the sealing plunger 6 moves up to a limit position, the lower end face of the sealing plunger 6 is far away from the upper end face of the sample inlet 23, and at the moment, sample fluid enters the inner cavity of the sample cylinder 1 through the sample inlet 22 and the sample inlet 23; when the screw rod 7 rotates reversely, the sealing plunger 6 moves downwards to the limit position, the sealing groove and the sealing ring at the lower section of the sealing plunger are completely inserted into the expanding sealing surface at the upper section of the sample inlet hole 23, and the high-pressure fluid sample in the sample cylinder 1 is sealed. The central through hole 24 of the sealing plunger 6 is necessary, the central through hole 24 is used for balancing the pressure difference between the upper end and the lower end of the sealing plunger 6, because the sealing plunger 6 is in clearance with the screw thread of the screw rod 7, the upper end face and the lower end face of the sealing plunger 6 are communicated, if higher pressure acts on the single end face of the sealing plunger 6, the sealing plunger 6 is difficult to axially move, and the pressure difference between the upper end and the lower end of the sealing plunger 6 is balanced due to the existence of the central through hole 24, the high pressure in the well does not generate larger resistance on the cross section of the sealing plunger 6, and the screw rod 7 can drive the sealing plunger 6 to axially move only by smaller torque.
The circuit principle of the circuit module is shown in figure 2, a battery pack or a communication interface is connected with an internal circuit of the circuit module through a socket CN6, an output end VDD of a positive electrode 12v of the battery pack is powered by a micro motor through a diode D0 and then VDD1, the output VCC of the VDD1 is powered by a singlechip U1 (PIC 16F 688) and a Hall sensor (89 s 31) through a voltage stabilizing circuit module U5 (TPS 76350) 5v, functions of timing, storage, operation, interface and the like are arranged in the singlechip U1, COM interfaces (RX and TX) of the COM interface are in program setting with an upper computer through the socket CN6, control levels are output at control ends k1 and k2 according to preset program timing, the micro motor is controlled to rotate forwards and reversely or stop, when k1 is high level and k2 is low level, the field effect transistor M2M3 is conducted, the M1M4 is cut off, the micro motor rotates positively, when k1 is low level and k2 is high level, the field effect transistor M1M4 is conducted, the M2M3 is cut off, the micro motor rotates reversely, when k1 and k2 are both high storage battery or low level, the micro motor stops rotating, a high-power current limiting resistor R7 is connected in series in a micro motor power supply passage, the micro motor U1 senses whether the micro motor is blocked or not through the AD_VIN end voltage of the current limiting resistor R7, the micro motor U1 counts the rotation of a motor shaft through the HR end externally connected with a Hall sensor, and the micro motor U1 is connected with a battery pack or a communication interface through an LED end identification socket CN 6. The flow chart of the built-in program of the singlechip U1 of the circuit module is shown in fig. 3, the mode identification is carried out firstly after the power-on is started, if the communication mode is detected, the signal connection is established with the upper computer, two delay parameters of the on waiting time and the continuous sample feeding time are set through the upper computer, if the connection battery pack, namely the working mode, the on waiting time is detected, the motor forward rotation is started after the countdown of the delay parameters is finished, the rotation number is continuously recorded, whether the motor stall is detected, the sealing plunger is judged to completely open the sample feeding hole when the design number of turns or the motor stall is reached, the motor stall is judged, the motor reverse rotation is started after the preset continuous sample feeding time is delayed, whether the motor stall is detected, the sealing plunger is completely closed the sample feeding hole when the design number of turns or the motor stall is reached, and the program is finished.
The invention discloses a thick oil underground sampling device which mainly comprises a sample tube, a head end connector, a tail end connector, a traveling plunger, a control short circuit, a sealing plunger, a screw rod, a miniature motor and a circuit module, wherein the sample tube holds a fluid sample in a well, two ends of the sample tube are respectively and hermetically connected with the head end connector and the tail end connector, a closed inner cavity of the sample tube is required to be vacuumized before the sample tube is taken down, the head end connector is axially provided with a sample injection hole, the upper end of the head end connector is connected with the control short circuit, the control short circuit is axially provided with a central inner hole, four sample injection holes are laterally arranged, the upper section of the central inner hole of the control short circuit is provided with the screw rod, the lower section of the control short circuit is provided with the sealing plunger, the screw rod and the sealing plunger are connected through trapezoidal threads, the upper end of the screw rod is connected with the miniature motor, the miniature motor is connected with the circuit module, and under the control of the circuit module, the screw rod is driven to rotate forward or reversely, the sealing plunger is driven to move downwards, when the screw rod rotates forward or reversely, the sealing plunger moves upwards to a limit position, the lower end face of the sealing plunger is far from the upper end face of the sample injection hole, the sample injection hole is opened, the sample injection hole is fluid sample passes through the four ports and the sample injection holes and the sealing plunger enters the vacuum sample tube and the limit position and is closed. The head end joint is laterally and symmetrically provided with a needle valve and a sample transferring port, and is a channel for vacuumizing the inner cavity of the sample cylinder before sampling and transferring out a fluid sample after sampling; the movable plunger is arranged at the tail end in the sample cylinder, can axially slide in the sample cylinder and is in contact seal with the inner wall of the sample cylinder; the tail end connector is laterally provided with a pressurizing valve and an interface which are communicated with the inner cavity of the sample cylinder, a high-pressure pipeline and a sample transferring pump are externally connected through the interface during sample transferring, high-pressure displacement fluid is injected to drive the movable plunger to slide from the tail end to the head end of the sample cylinder, and the movable plunger drives the fluid sample to be completely discharged from the sample transferring port. The working process is that before sampling, the sealing plunger descends to close the sampling hole, the needle valve is closed after the inner cavity of the sample cylinder is vacuumized from the sample transferring port, and the circuit module is programmed, electrified and lowered into the well to the target depth; the circuit module controls the motor to rotate positively at regular time, drives the sealing plunger to ascend to open the sample injection hole, and the high-pressure fluid in the well floods into the sample injection hole to quickly fill the inner cavity of the sample cylinder vacuumized in advance, and after the set time delay is finished, the motor rotates reversely, and the sealing plunger descends to close the sample injection hole to seal the high-pressure fluid sample in the sample cylinder; after the well is discharged, high-pressure displacement fluid is injected from an interface of the tail end connector, the movable plunger is driven to slide from the tail end to the head end of the sample barrel, and the sample fluid is driven to be completely discharged from the sample transferring port to the sample transferring container.
The operation of the thick oil underground sampling device is divided into three steps of sampling preparation, underground sampling and ground sample transferring.
1. Sampling preparation
According to the assembly of the components shown in fig. 1 (except the battery tube and the battery pack), the sample injection hole 23 is closed by taking the sealing plunger 6 at the lower limit position, the movable plunger 4 is arranged at the tail end of the sample tube 1, the pressurizing valve 11 is closed after the connecting pipeline is vacuumized from the interface 12, the needle valve 14 is closed after the connecting pipeline is vacuumized from the sample transfer port 13, the vacuumized pipeline is removed, the interface protecting screw is screwed in, the movable plunger 4 is positioned at the tail end of the sample tube 1, and all sealing spaces in the sample tube 1 at the upper side and the lower side of the movable plunger, the sample injection hole 23, the central through hole 24 and the gaps between the sealing plunger 6 and the screw rod 7 are all in a vacuum state. The device is connected with an upper computer, and the circuit module of the device is subjected to program setting according to a construction scheme, and two delay parameters of 'start waiting' time and 'continuous sample feeding' time are set.
2. Downhole sampling
The device is connected with a battery pack and a battery cylinder before the device is put down into a well, and the device is put down to a preset depth by using equipment such as a wire winch. As shown in figure 1, after the delay of 'opening waiting' set by the circuit module of the device is finished, a forward rotating circuit of a motor is connected, a motor transmission shaft drives a screw rod 7 to rotate forward through a coupler, the screw rod 7 drives a sealing plunger 6 to open a sample injection channel 23 in an upward direction, sample fluid in a well enters an inner cavity of a sample cylinder 1 through a sample injection port 22, a filter screen 25 and the sample injection channel 23, the inner cavity of the sample cylinder 1 is fully filled with the sample fluid after the preset 'continuous sample injection' time delay, meanwhile, the sample fluid fills a gap between the thread and the upper end of the screw rod through a central through hole 24, the upper end surface and the lower end surface of the sealing plunger 6 bear pressure balance, then the motor rotates reversely, the motor transmission shaft drives the screw rod 7 to rotate reversely through the coupler, the screw rod 7 drives the sealing plunger 6 to close the sample injection channel 23 in a downward direction, and underground sampling is finished. The device of the invention is then removed to the surface and the high pressure fluid sample is enclosed in a sealed space within the cartridge 1. The circuit module is provided with a Hall sensor and a motor locked rotor detection function, so that the sealing plunger 6 can be driven in place, and the motor is protected from overload damage. After the sampling is completed, the movable plunger 4 is still located at the tail end of the cartridge 1.
3. Ground sample transferring device
As shown in fig. 4, the whole device of the invention is fixed on a ground sample transferring table 407, a sample transferring port 413 is externally connected with a second high-pressure pipeline 409 and is connected with a high-pressure experimental kettle 404, and an interface 412 is externally connected with a first high-pressure pipeline 408 and is connected with a sample transferring pump 403. The heating sleeve 402 is started to heat, the temperature is kept to the temperature of the sampling point, the sample cylinder 401 is continuously swayed in the heating process, and the sample fluid in the sample cylinder 401 is uniformly restored to the temperature and pressure state in the stratum. The needle valve 414 and the pressurizing valve 411 are opened, the sample transfer pump 403 is started to slowly press, the indication value of the pressure gauge 405 is stably increased and then basically stabilized at a certain value, the displacement fluid enters the lower end of the sample cylinder 1 through the high-pressure pipeline 408 and the interface 412 to drive the movable plunger 410 to slide upwards, and the movable plunger 410 drives the sample fluid in the sample cylinder 401 to transfer into the high-pressure experimental kettle 404 through the sample transfer port 413 and the high-pressure pipeline 409. When the pressure gauge 405 shows a steep rise, it indicates that the traveling plunger 410 has moved to the upper limit position of the cartridge 401, the sample valve 406 is closed, and sample transfer is completed. And then disassembling each sealing part, cleaning residual sample fluid, and replacing the sealing element for the next sampling work.
Claims (5)
1. The thick oil underground sampling device is characterized by comprising a sample cylinder, a head end connector, a control short circuit, a sealing plunger, a screw rod, a miniature motor and a circuit module, wherein the sample cylinder holds an in-well fluid sample, the head end connector is axially provided with a sample injection hole, the lower end of the head end connector is connected with the sample cylinder, the upper end of the head end connector is connected with the control short circuit, the control short circuit is axially provided with a central inner hole and four sample injection ports in a lateral direction, the upper section of the central inner hole of the control short circuit is provided with the screw rod, the lower section of the control short circuit is provided with the sealing plunger, the upper end of the screw rod is connected with the miniature motor, the miniature motor is connected with the circuit module, the screw rod is driven to rotate forwards or backwards under the control of the circuit module, the forward and backward rotation of the screw rod drives the sealing plunger to move upwards to an extreme position, at the moment, the lower end surface of the sealing plunger is far away from the upper end surface of the sample injection hole, and the fluid sample enters the inner cavity of the sample cylinder through the four sample injection ports and the sample injection hole, and the sealing plunger moves downwards to the extreme position when the screw rod rotates backwards; the head end joint is laterally and symmetrically provided with a sample transferring port and a needle valve, the sample transferring port is externally connected with a high-pressure pipeline and is used for vacuumizing the inner cavity of the sample cylinder before sampling and transferring and discharging a fluid sample after sampling, the needle valve is used for closing the sample transferring port, the diameter of a valve rod of the needle valve is far smaller than that of the sample inlet, and the needle valve does not form blockage of the sample inlet;
the thickened oil underground sampling device also comprises a tail end connector, wherein the tail end connector is arranged at the lower end of the sample cylinder, a pressurizing valve and an interface are arranged in the lateral direction and are communicated with the inner cavity of the sample cylinder, the interface is externally connected with a high-pressure pipeline and is used for injecting high-pressure displacement fluid when a sample is transferred after the sampling, and the pressurizing valve is used for closing the interface;
the thickened oil underground sampling device also comprises a movable plunger, wherein the movable plunger is positioned at the tail end in the sample cylinder, slides axially in the sample cylinder and contacts and seals with the inner wall of the sample cylinder, high-pressure displacement fluid is injected from the interface of the tail end connector during sample transferring to drive the movable plunger to move from the tail end to the head end of the sample cylinder, and the movable plunger drives a fluid sample in the sample cylinder to be completely discharged from the sample transferring port;
the thickened oil underground sampling device further comprises a bearing sleeve, a Hall sensor and a framework, wherein the internal thread of the control short circuit is connected with the bearing sleeve, the Hall sensor is installed on a side surface opening of the bearing sleeve, the framework is sleeved on the bearing sleeve, and the circuit module and the miniature motor are fixedly installed on the framework.
2. The device according to claim 1, wherein the sealing plunger is provided with a central through hole for balancing the pressure difference at the upper end and the lower end of the sealing plunger, the resistance of the sealing plunger to the up-down movement is reduced to the greatest extent, a trapezoid internal thread is arranged in the central through hole and is connected with the screw rod, the screw rod is fixed with the control short circuit through a thrust bearing, the screw rod is axially rotated to drive the sealing plunger to move up and down, the screw rod is sealed by the contact of a sealing ring and the control short circuit, the upper section of the sealing plunger is a smooth sealing cylindrical surface, a sealing ring is arranged between the sealing cylindrical surface and the central inner hole wall of the control short circuit, two sealing grooves are arranged at the lower end of the sealing plunger and rubber sealing rings are arranged at the lower end of the sealing plunger, positioning ribs are axially arranged at two sides of the middle section of the sealing plunger and are limited by a positioning sleeve and cannot rotate.
3. The apparatus of claim 1, wherein the circuit module employs a single-chip microcomputer PIC16F688, and the single-chip microcomputer PIC16F688 counts the rotation of the miniature motor shaft via an HR end externally connected to the hall sensor.
4. The apparatus according to claim 1, further comprising a nonmagnetic coupling and a cylindrical magnetic steel, wherein the upper end of the screw is connected to the rotating shaft of the micro motor by the nonmagnetic coupling, and the cylindrical magnetic steel is mounted on the side surface of the nonmagnetic coupling transversely corresponding to the hall sensor.
5. The apparatus of claim 1, further comprising a battery pack and a battery cartridge, wherein the upper external thread of the control short is in sealing connection with the battery cartridge, and wherein the battery pack is located in the upper space of the battery cartridge and is connected with the circuit module to supply power to the circuit module and the micro-motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811001569.4A CN108952702B (en) | 2018-08-30 | 2018-08-30 | Underground sampling device for thickened oil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811001569.4A CN108952702B (en) | 2018-08-30 | 2018-08-30 | Underground sampling device for thickened oil |
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| CN108952702B true CN108952702B (en) | 2024-04-16 |
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| CN113309516A (en) * | 2020-02-26 | 2021-08-27 | 中国石油天然气股份有限公司 | Downhole sampling apparatus and method |
| CN113532938B (en) * | 2020-09-24 | 2022-12-02 | 中国地质科学院岩溶地质研究所 | Deep hole in-situ sampling equipment |
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| CN108952702A (en) | 2018-12-07 |
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