CN113309516A - Downhole sampling apparatus and method - Google Patents
Downhole sampling apparatus and method Download PDFInfo
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- CN113309516A CN113309516A CN202010118802.8A CN202010118802A CN113309516A CN 113309516 A CN113309516 A CN 113309516A CN 202010118802 A CN202010118802 A CN 202010118802A CN 113309516 A CN113309516 A CN 113309516A
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- 238000005070 sampling Methods 0.000 title claims abstract description 179
- 238000000034 method Methods 0.000 title claims abstract description 27
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The disclosure relates to an underground sampling device and method, and belongs to the technical field of sampling. This is disclosed through setting up control module, removal module and positioning unit, after putting down this sampling module in the pit, this positioning unit can send position signal to this control module, and based on this position signal, this control module can control this removal module, drives this sampling module and removes preset distance to reach the position that needs the sample, also the sampling position that has realized this sampling module is comparatively accurate. The sampling module finishes sampling after staying for a certain time at the position, the driving unit drives the central rod to move, the opening of the sampling cylinder is closed, the sampling module is lifted out of the well through the moving module, and sampling is finished, so that the sampling process can be controlled in real time.
Description
Technical Field
The disclosure relates to the technical field of sampling, in particular to an underground sampling device and method.
Background
As the exploration and development of oil fields are deepened day by day, the stable production of old areas, the upward production of new areas and the development of low-permeability oil reservoirs are suitable for reservoir conditions. In order to study and determine the phase and properties of reservoir fluids under simulated production conditions, downhole fluid physical analysis is required. The downhole sampling can obtain a fluid sample representing a stratum, and then various researches are developed in a laboratory, so that accurate basis is provided for reasonably exploiting and evaluating an oil reservoir and formulating an optimal development scheme.
The existing underground sampler is driven by a clock control and a battery motor, and is usually sampled based on an automatic control program preset inside the sampler after the sampler is placed for a certain distance through a steel wire.
Above-mentioned sampler is in the use, and the sampler can't reach accurate sample position, also can't real time control sampling process.
Disclosure of Invention
The embodiment of the disclosure provides an underground sampling device and method, which can solve the problems that the conventional sampler cannot reach an accurate sampling position and cannot control the sampling process in real time. The technical scheme is as follows:
in one aspect, a downhole sampling device is provided, the device comprising: the device comprises a control module, a moving module and a sampling module;
the sampling module comprises a positioning unit, a sampling unit and a driving unit;
the control module is positioned on the well and electrically coupled with the moving module, the positioning unit and the driving unit through cables;
the positioning unit is used for sending a position signal to the control module, and the control module can control the moving module based on the position signal to drive the sampling module to move a preset distance to a sampling position;
the sampling unit comprises a sampling cylinder and a central rod, wherein an opening matched with the end part of the central rod is formed in the inner wall of the sampling cylinder;
the driving unit is used for driving the central rod to move along the axial direction, so that the opening and the closing of the opening are controlled.
In one possible design, the positioning unit includes a radioactive signal acquisition instrument;
the radioactive signal acquisition instrument is used for acquiring radioactive signals of the stratum as position signals.
In one possible design, the device further includes a temperature detection module for sending a temperature signal to the control module.
In one possible design, the drive unit includes: a drive motor and a lead screw;
the output shaft of the driving motor is in threaded connection with the lead screw and is used for driving the lead screw to rotate;
the screw rod drives the central rod to move along the axial direction through rotation;
the inner part of the sampling tube is provided with at least one centering structure for limiting the position of the central rod in the radial direction.
In one possible design, a nut is provided between the screw and the central rod.
In one possible design, the inner wall of the sampling tube has an upper opening and a lower opening;
the center rod is provided with an upper sealing plug matched with the upper opening and a lower sealing plug matched with the lower opening.
In one possible design, the center rod is connected with the lower plug through an elastic element.
In one possible design, the sampling unit further includes a first limit switch for sending a close signal to the control module after the central rod closes the opening.
In one possible design, the sampling unit further comprises a second limit switch for sending an open signal to the control module after the center rod opens the opening.
In one aspect, there is provided a downhole sampling method for use with a downhole sampling device as provided in any one of the above possible designs, the method comprising:
the control module controls the mobile module to operate and transports the sampling module to the underground;
during the movement of the sampling module, the positioning module sends a position signal to the control module;
based on the position signal, the control module controls the moving module to drive the sampling module to move a preset distance to a sampling position;
after the sampling module stays at the sampling position for a preset time, the driving unit drives the central rod to close the opening;
the control module controls the mobile module to drive the sampling module to return to the well.
Through setting up control module, removal module and positioning unit, after putting down this sampling module in the pit, this positioning unit can send position signal to this control module, and based on this position signal, this control module can control this removal module, drives this sampling module and removes and predetermines the distance to reach the position that needs the sample, also the sampling position that has realized this sampling module is comparatively accurate promptly. The sampling module finishes sampling after staying for a certain time at the position, the driving unit drives the central rod to move, the opening of the sampling cylinder is closed, the sampling module is lifted out of the well through the moving module, and sampling is finished, so that the sampling process can be controlled in real time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a downhole sampling device provided by an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a downhole sampling device provided by an embodiment of the disclosure;
FIG. 3 is a flow chart of a downhole sampling method provided by an embodiment of the disclosure.
The various reference numbers in the drawings are illustrated below:
1-a control module;
2-a mobile module;
3-a sampling module;
31-a positioning unit;
311-radioactive signal collector;
32-a sampling unit;
321-a sampling tube;
3211-righting structure;
32111 a first centering sleeve, 32112 a second centering sleeve;
3212-upper opening;
3213-lower opening;
322-a center rod;
3221-a nut;
3222-upper plug;
3223-lower closure;
32231-an elastic member;
323-first limit switch;
324-a second limit switch;
33-a drive unit;
331-drive motor, 332-lead screw;
4-a temperature detection module;
5-a fixing frame;
6-a coupler;
7-a bearing;
8-a first fastening pin;
9-a second fastening pin;
10-a circuit board;
11-a line skeleton;
12-a third fastening pin;
13-a set screw;
14-copper seat cover;
15-a polytetrafluoroethylene sheath;
16-a clamp spring;
17-upper joint;
18-an intermediate joint;
19-lower joint;
110-connecting screws;
111-upper flow channel joint;
112-lower channel junction;
113-a spring seat;
114-a first stopper;
115-second stopper.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a downhole sampling device provided in an embodiment of the present disclosure, and fig. 2 is a schematic structural diagram of a downhole sampling device provided in an embodiment of the present disclosure, please refer to fig. 1 and fig. 2, the device includes: the device comprises a control module 1, a moving module 2 and a sampling module 3; the sampling module 3 comprises a positioning unit 31, a sampling unit 32 and a driving unit 33; the control module 1 is located on the well and electrically coupled with the moving module 2, the positioning unit 31 and the driving unit 33 through cables; the positioning unit 31 is configured to send a position signal to the control module 1, and the control module 1 can control the moving module 2 based on the position signal to drive the sampling module 3 to move a preset distance to a sampling position; the sampling unit 32 comprises a sampling cylinder 321 and a central rod 322, wherein the inner wall of the sampling cylinder 321 is provided with an opening matched with the end part of the central rod 322; the driving unit 33 is used for driving the central rod 322 to move along the axial direction, so as to control the opening and closing of the opening.
The working principle of the device provided by the embodiment of the disclosure is detailed as follows:
when the device is required to be used for sampling liquid at a downhole sampling position, the method can be carried out according to the following steps: the control module 1 controls the mobile module 2 to operate, and the sampling module 3 is conveyed to the underground; during the movement of the sampling module 3, the positioning module sends a position signal to the control module 1; based on the position signal, the control module 1 controls the moving module 2 to drive the sampling module 3 to move a preset distance to a sampling position; after the sampling module 3 stays at the sampling position for a preset time, the driving unit 33 drives the central rod 322 to close the opening; the control module 1 controls the mobile module 2 to drive the sampling module 3 to return to the well.
Through setting up control module 1, moving module 2 and positioning unit 31, after putting down this sampling module 3 in the pit, this positioning unit 31 can send position signal to this control module 1, and based on this position signal, this control module 1 can control this moving module 2, drives this sampling module 3 and removes preset distance to reach the position that needs the sample, has realized that this sampling module 3's sampling position is comparatively accurate promptly. The sampling module 3 finishes sampling after staying for a certain time at the position, the driving unit 33 drives the central rod 322 to move, the opening of the sampling cylinder 321 is closed, the sampling module 3 is lifted out of the well through the moving module 2, sampling is finished, and therefore real-time control can be performed on the sampling process.
In this working process, can detect whole sample process through control module 1, control the sample action, the device has structural design is reasonable, and the practicality is strong, safe and reliable's advantage can improve the production efficiency of enterprise, reduces the manufacturing cost of enterprise.
The following details the structure and the working principle of each part of the device:
in one possible design, the positioning unit 31 includes a radioactive signal collector 311; the radioactive signal collector 311 is used to collect radioactive signals of the formation as position signals.
The control module 1 compares the original radioactive signals of the radioactive signal stratum, and the original radioactive signals of the stratum have stability and have corresponding position information, so that the actual position of the positioning unit 31 can be determined based on the signals sent by the radioactive signal acquisition instrument 311.
Specifically, the positioning unit 31 may be lowered into the well by means of a magnetic positioning instrument, connected by a winch, a cable, a motor, and other devices, and transmits the downhole measurement result to a ground instrument to be converted into a depth signal, and then performs numerical control recognition and manual verification, so as to correct the depth accurately and ensure the sampling depth accurately. Wherein the cable may be an armored cable.
For example, the radioactive signal acquirer 311 can acquire a gamma signal of the formation, and the original radioactive signal of the formation includes a correspondence between a value of the gamma signal and a depth of the formation.
In one possible design, the positioning unit 31 further comprises a magnetic signal collector for sending the magnetic signal of the formation to the control module 1.
In particular, the magnetic signal harvester may be responsive to oil, casing collars or a tool to describe depth by a characteristic tool depth. The magnetic signal acquisition instrument and the radioactive signal acquisition instrument 311 describe the underground depth comprehensively, and the positioning accuracy can be further improved.
In one possible design, the device further comprises a temperature detection module 4 for sending a temperature signal to the control module 1.
The temperature detection module 4 may send a temperature signal to the control module 1 in real time during the process of running the device downhole. By combining the position signal sent by the positioning unit 31, the control module 1 can obtain the temperature information of each depth in the well, and can qualitatively judge the injection and output conditions of the horizon by combining the well fluid displacement rule based on the temperature information, thereby providing effective reference for the selection of the sampling position.
For example, for a region where well fluid displacement is good, the temperature may be high, and sampling of the region may be good.
Of course, the sampling position may be pre-selected, or may be reset in combination with the position signal and the temperature signal, which is not limited in this embodiment.
In one possible design, the drive unit 33 includes: a drive motor 331 and a lead screw 332; the output shaft of the driving motor 331 is in threaded connection with the lead screw 332 and is used for driving the lead screw 332 to rotate; the lead screw 332 drives the central rod 322 to move axially by rotating; the inner portion of the withdrawal chimney 321 has at least one centering structure 3211 for limiting the radial position of the central rod 322.
Specifically, the driving motor 331 may be a servo motor, and the servo motor is an engine that controls the operation of mechanical elements in a servo system, and is an indirect speed change device of a supplementary motor. The servo motor can control the speed and position accuracy accurately, and can convert the voltage signal into torque and rotating speed to drive a control object. The rotor speed of the servo motor is controlled by an input signal and can react quickly, and the servo motor is used as an actuating element in an automatic control system.
The threaded spindle 332 is fixedly connected to the output shaft for outputting a rotational movement. Specifically, the lead screw 332 can be a trapezoidal lead screw, has good bearing capacity, can be processed by a cyclone milling process, and is high in process efficiency and low in cost.
In a possible design, a first centering sleeve 32111 is disposed on an inner wall of the sampling barrel 321 for assisting in supporting the central rod 322 and limiting rotation and offset of the central rod 322, an upper end of the central rod 322 is sleeved on the lead screw 332 and engaged with the lead screw 332 through threads, and during rotation of the lead screw 332, the central rod 322 does not rotate but moves up and down to control opening and closing of the opening. The first centering sleeve 32111 may have a plurality of through holes, for example, 2 to 8 through holes with a diameter of 4mm, which is not limited in this embodiment.
In one possible design, the first centering sleeve 32111 is fixedly coupled to the center rod 322 and moves up and down with the center rod 322. For example, the fixing may be by welding.
In a possible design, the inner diameter of the first centering sleeve 32111 is matched with the inner diameter of the center rod 322, a vertical protrusion may be disposed in the inner cavity of the first centering sleeve 32111, a groove matched with the vertical protrusion is disposed on the outer wall of the center rod 322, and during the up-and-down movement of the center rod 322 relative to the first centering sleeve 32111, the protrusion is always in the groove, so that the center rod 322 does not rotate or deflect. The groove may also enhance the strength of the center rod 322.
Of course, a groove may be provided in the inner cavity of the first centering sleeve 32111, and a protrusion may be provided on the outer wall of the center rod 322, which is not limited in this embodiment.
Further, the driving unit 33 further includes a fixing frame 5, a coupling 6 and a bearing 7, the coupling 6 is fixed on the inner wall of the outer cylinder of the driving unit 33 by a first fastening pin 8, the fixing frame 5 and the coupling 6 are fixed on the inner wall by a second fastening pin 9, and the fixing frame 5 is used for fixing the driving motor 331 and the bearing 7 to prevent rotation. The coupling 6 is used to connect the output shaft of the driving motor 331 and the lead screw 332. Wherein, the outer cylinder of the driving unit 33 is a pressure-bearing outer pipe of the driving unit 33, the material is 17-4 steel, and the outer diameter is 41 mm.
The bearing 7 is disposed between the coupler 6 and the fixing frame 5, and is used for ensuring the rotation of the output end of the driving motor 331.
In this drive unit 33, can also be equipped with circuit board 10 and circuit skeleton 11, this circuit skeleton 11 is fixed on the inner wall of the urceolus of this drive unit 33 through third fastening pin 12, this circuit board 10 is fixed on this circuit skeleton 11 through set screw 13, this circuit board 10 is connected with driving motor 331, copper seat cover 14 respectively through the high temperature line, copper seat cover 14 sets up in the urceolus of this drive unit 33 through polytetrafluoroethylene sheath 15 to clamp through jump ring 16, prevent to drop, polytetrafluoroethylene sheath 15 can protect the cable of inside, has waterproofness.
The driving unit 33 and the positioning unit 31 can be integrally arranged or respectively arranged, and are connected through an upper joint 17, the upper joint 17 and the outer cylinder of the driving unit 33 are connected through threads, and pressure-bearing sealing welding is carried out, so that the sealing effect is ensured; the outer cylinder of the driving unit 33 is connected with the sampling cylinder 321 through an intermediate joint 18, and the bottom of the sampling cylinder 321 is also provided with a detachable lower joint 19 for pouring out the liquid in the sampling cylinder 321.
In one possible design, a nut 3221 is disposed between the lead screw 332 and the center rod 322.
Specifically, the screw 332 is engaged with a nut 3221, and the nut 3221 is fixedly connected to the center rod 322 by the connecting screw 110. The inner wall of the sampling tube 321 is provided with a second centering sleeve 32112 for assisting in supporting the nut 3221 and limiting rotation and offset of the nut 3221, and during rotation of the lead screw 332, the nut 3221 does not rotate but moves up and down to control opening and closing of the opening through the center rod 322.
Specifically, the inner diameter of the second centering sleeve 32112 is matched with the inner diameter of the nut 3221, a vertical protrusion may be disposed in an inner cavity of the second centering sleeve 32112, a groove matched with the vertical protrusion is disposed on an outer wall of the nut 3221, and the protrusion is always in the groove during the up-and-down movement of the nut 3221 relative to the second centering sleeve 32112, so that the nut 3221 does not rotate or deflect. The groove may also strengthen the nut 3221.
Of course, a groove may be provided in the inner cavity of the second centering sleeve 32112, and a protrusion may be provided on the outer wall of the nut 3221, which is not limited in this embodiment.
In one possible design, the inner wall of the sampling tube 321 has an upper opening 3212 and a lower opening 3213; an upper sealing plug 3222 adapted to the upper opening 3212 and a lower sealing plug 3223 adapted to the lower opening 3213 are disposed on the center rod 322.
In particular, the upper closure 3222 and the lower closure 3223 may be made of a material that facilitates sealing, and may be rubber, for example. The upper sealing plug 3222 and the lower sealing plug 3223 are used for respectively sealing the upper opening 3212 and the lower opening 3213 after sampling is stopped, and the sealing material can improve the sealing effect and the purity of the sampled sample.
During the process of lowering the device into the wellbore, the upper opening 3212 and the lower opening 3213 may be opened or closed, which is not limited in this embodiment.
Wherein, the sampling tube 321 can be made of 17-4 steel, and has an outer diameter of 41mm, and is adapted to the outer tube of the driving unit 33. The length of the sampling tube 321 determines the sampling volume, which can be set according to the requirement, but this embodiment is not limited thereto.
Liquid can flow into or out of the sampling cylinder 321 through the upper opening 3212 and can also flow into or out of the sampling cylinder 321 through the lower opening 3213, so that the device can be applied to a producer well and an injector well, and the application range of the device is expanded. Wherein formation fluid from the producer well exits through the wellbore to the surface and fluid from the injector well enters the formation through the wellbore to supplement formation energy.
The upper opening 3212 and the lower opening 3213 are coaxially disposed with the sampling tube 321, an upper flow channel joint 111 is further disposed on the outer wall of the sampling tube 321 at a position above the upper opening 3212, an opening is disposed on the upper flow channel joint 111, and a fluid flowing channel is formed between the opening and the upper opening 3212.
A lower flow passage joint 112 is further provided below the outer wall of the sampling tube 321 at a position below the lower opening 3213, and an opening is provided below the lower flow passage joint 112, and a fluid flow passage is formed between the opening and the lower opening 3213.
In the above structure, the distance between the upper opening 3212 and the lower opening 3213 is equal to the distance between the upper plug 3222 and the lower plug 3223, so as to ensure that the upper plug 3222 and the lower plug 3223 can block the upper opening 3212 and the lower opening 3213 during the up-and-down movement of the center rod 322.
In one possible design, the center rod 322 is connected to the lower closure 3223 by an elastic member 32231.
The elastic member 32231 is used to provide elasticity to the lower stopper 3223 to ensure a tight seal between the lower stopper 3223 and the lower opening 3213. After the sampling module 3 is lifted up, pressure can be applied to the lower plug 3223 from the outside of the lower opening 3213 to compress the elastic member 32231, so as to discharge the sample out of the sampling tube 321.
After the sampling module 3 is transported to the sampling position, the sampling module 3 is filled with the original liquid, which may come from other positions, so that after the sampling module 3 stays at the sampling position for a preset time period, the central rod 322 moves to close the upper opening 3212 and the lower opening 3213. After the upper opening 3212 is sealed, the lower plug 3223 may be pressed against the lower opening 3213 by the elastic force of the elastic member 32231 to close the lower opening 3213.
Further, the lower opening 3213 is a trapezoidal opening, and the diameter is gradually reduced along the direction of inserting the lower sealing plug 3223, and accordingly, the lower sealing plug 3223 also has a trapezoidal shape to make the sealing more tight.
Specifically, the elastic member 32231 may be a spring, and the spring is connected to the center rod 322 via the spring seat 113.
In one possible design, the sampling unit 32 further includes a first limit switch 323 for sending a close signal to the control module 1 after the center rod 322 closes the opening.
The first limit switch 323 is located on the inner wall of the sampling unit 32, and when the central rod 322 moves downward to close the opening, the first limit block 114 on the central rod 322 just contacts with the first limit switch 323 to apply pressure to the first limit switch 323, so that the first limit switch 323 can control the axial movement distance of the central rod 322, and send a signal to the control module 1.
Specifically, the limit switch utilizes the collision of a mechanical motion part to enable a contact of the mechanical motion part to act so as to realize connection or disconnection of a control circuit, and a certain control purpose is achieved. Generally, such switches are used to limit the position or stroke of the movement of the machine, so that the moving machine can automatically stop, move in reverse, shift or automatically move back and forth according to a certain position or stroke.
In one possible design, the sampling unit 32 further includes a second limit switch 324 for sending an open signal to the control module 1 after the center rod 322 opens the opening.
Wherein the second limit switch 324 is located on the inner wall of the sampling unit 32, when the central rod 322 moves upwards to open the opening, the second limit block 115 on the central rod 322 just contacts with the second limit switch 324, and applies pressure to the second limit switch 324, so that the second limit switch 324 can send a signal to the control module 1.
The specific structure and operation principle of the second limit switch 324 are the same as those of the first limit switch 323, and are not described herein again.
All the above-mentioned optional technical solutions can be combined arbitrarily to form the optional embodiments of the present invention, and are not described herein again.
The device that this disclosure provided, through setting up control module 1, moving module 2 and positioning unit 31, after transferring this sampling module 3 to in the pit, this positioning unit 31 can send position signal to this control module 1, and based on this position signal, this control module 1 can control this moving module 2, drives this sampling module 3 and removes preset distance to reach the position that needs the sample, also the sampling position that has realized this sampling module 3 is comparatively accurate. The sampling module 3 finishes sampling after staying for a certain time at the position, the driving unit 33 drives the central rod 322 to move, the opening of the sampling cylinder 321 is closed, the sampling module 3 is lifted out of the well through the moving module 2, sampling is finished, and therefore real-time control can be performed on the sampling process.
Further, the device also comprises a temperature detection module 4 for sending a temperature signal to the control module 1. By combining the position signal sent by the positioning unit 31, the control module 1 can obtain the temperature information of each depth in the well, and can qualitatively judge the injection and output conditions of the horizon by combining the well fluid displacement rule based on the temperature information, thereby providing effective reference for the selection of the sampling position.
Fig. 3 is a flow chart of a downhole sampling method provided by an embodiment of the present disclosure, please refer to fig. 3, which is applied to a downhole sampling device provided in any one of the above possible designs, and the method includes:
301. the control module 1 controls the moving module 2 to operate, and the sampling module 3 is conveyed to the underground.
Specifically, before the sampling module 3 goes down the well, the sampling cylinder 321 can be opened, so that the pressure inside the sampling cylinder 321 can be ensured to be stable in the process of going down the well.
Further, the test can be started from a position 100 meters above the target interval from the sampling module 3, the test is reduced at a speed of 800-1000 meters/hour, and the test is finished 50 meters below the target interval, temperature data is recorded and fed back to the control module 1, a temperature curve is formed, and interval production information is obtained.
302. During the movement of the sampling module 3, the positioning module sends a position signal to the control module 1.
Specifically, the winch control system can start ascending from a position 50 meters below a target interval, record magnetic positioning data and radioactive data with the length not less than 150 meters to form a magnetic positioning gamma curve, compare the test data with the original radioactive curve, check the depth, obtain a correction value, and sequentially correct the winch depth according to the comparison result.
303. Based on the position signal, the control module 1 controls the moving module 2 to drive the sampling module 3 to move a predetermined distance to a sampling position.
In particular, multiple adjustments may be made to ensure accuracy of the sampling location.
304. After the sampling module 3 stays at the sampling position for a predetermined time, the driving unit 33 drives the central rod 322 to close the opening.
For example, the preset time period may be 10 minutes, so that the liquid in the sampling cylinder 321 is sufficiently replaced to ensure that the liquid stored therein is free of impurities at other levels. If the well is an injection well, the fluid flows into the sampler barrel 321 from top to bottom; if the well is a producer well, fluid flows from bottom to top into the sampler barrel 321.
305. The control module 1 controls the mobile module 2 to drive the sampling module 3 to return to the well.
After the sampling module 3 is returned uphole, the standard loft valve is connected to allow fluid to flow out by opening the sampling cylinder 321.
All the above-mentioned optional technical solutions can be combined arbitrarily to form the optional embodiments of the present invention, and are not described herein again.
According to the method provided by the disclosure, by arranging the control module 1, the moving module 2 and the positioning unit 31, after the sampling module 3 is put down to the underground, the positioning unit 31 can send a position signal to the control module 1, based on the position signal, the control module 1 can control the moving module 2 to drive the sampling module 3 to move a preset distance so as to reach a position needing sampling, namely, the sampling position of the sampling module 3 is relatively accurate. The sampling module 3 finishes sampling after staying for a certain time at the position, the driving unit 33 drives the central rod 322 to move, the opening of the sampling cylinder 321 is closed, the sampling module 3 is lifted out of the well through the moving module 2, sampling is finished, and therefore real-time control can be performed on the sampling process.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A downhole sampling device, the device comprising: the device comprises a control module (1), a moving module (2) and a sampling module (3);
the sampling module (3) comprises a positioning unit (31), a sampling unit (32) and a driving unit (33);
the control module (1) is located on the well and electrically coupled with the moving module (2), the positioning unit (31) and the driving unit (33) through cables;
the positioning unit (31) is used for sending a position signal to the control module (1), and the control module (1) can control the moving module (2) based on the position signal to drive the sampling module (3) to move a preset distance to a sampling position;
the sampling unit (32) comprises a sampling cylinder (321) and a central rod (322), wherein the inner wall of the sampling cylinder (321) is provided with an opening matched with the end part of the central rod (322);
the driving unit (33) is used for driving the central rod (322) to move along the axial direction, so that the opening and the closing of the opening are controlled.
2. The device according to claim 1, characterized in that the positioning unit (31) comprises a radioactive signal acquisition instrument (311);
the radioactive signal acquisition instrument (311) is used for acquiring radioactive signals of the stratum as position signals.
3. The device according to claim 1, characterized in that it further comprises a temperature detection module (4) for sending a temperature signal to the control module (1).
4. The device according to claim 1, wherein the drive unit (33) comprises: a drive motor (331) and a lead screw (332);
an output shaft of the driving motor (331) is in threaded connection with the lead screw (332) and is used for driving the lead screw (332) to rotate;
the lead screw (332) drives the central rod (322) to move along the axial direction through rotation;
the inner part of the sampling cylinder (321) is provided with at least one righting structure (3211) for limiting the position of the central rod (322) in the radial direction.
5. The device according to claim 4, characterized in that a nut (3221) is provided between the lead screw (332) and the central rod (322).
6. The device according to claim 1, characterized in that the inner wall of the sampling cylinder (321) has an upper opening (3212) and a lower opening (3213);
an upper sealing plug (3222) matched with the upper opening (3212) and a lower sealing plug (3223) matched with the lower opening (3213) are arranged on the center rod (322).
7. The device according to claim 6, wherein the connection between the central rod (322) and the lower closure (3223) is via an elastic member (32231).
8. The device according to claim 1, characterized in that the sampling unit (32) further comprises a first limit switch (323) for sending a closing signal to the control module (1) after the central rod (322) closes the opening.
9. The device according to claim 1, characterized in that the sampling unit (32) further comprises a second limit switch (324) for sending an opening signal to the control module (1) after the central rod (322) opens the opening.
10. A downhole sampling method applied to any one of the downhole sampling devices as claimed in claim 1 to claim 9, the method comprising:
the control module (1) controls the mobile module (2) to operate, and the sampling module (3) is conveyed to the underground;
during the movement of the sampling module (3), the positioning module sends a position signal to the control module (1);
based on the position signal, the control module (1) controls the moving module (2) to drive the sampling module (3) to move a preset distance to a sampling position;
after the sampling module (3) stays at the sampling position for a preset time, the driving unit (33) drives the central rod (322) to close the opening;
the control module (1) controls the mobile module (2) to drive the sampling module (3) to return to the ground.
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| CN202010118802.8A CN113309516A (en) | 2020-02-26 | 2020-02-26 | Downhole sampling apparatus and method |
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| CN202010118802.8A CN113309516A (en) | 2020-02-26 | 2020-02-26 | Downhole sampling apparatus and method |
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