CN111411949A

CN111411949A - Pumping device, sampling system and sampling method

Info

Publication number: CN111411949A
Application number: CN202010241110.2A
Authority: CN
Inventors: 冯永仁; 秦小飞; 兰萌; 沈阳; 周明高; 左有祥; 支宏旭; 陈永超; 孔笋; 薛永增
Original assignee: China Oilfield Services Ltd; China National Offshore Oil Corp CNOOC
Current assignee: China Oilfield Services Ltd; China National Offshore Oil Corp CNOOC
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-07-14

Abstract

The invention discloses a pumping device, a sampling system and a sampling method. The sampling system comprises a probe device used for being attached to mixed fluid, a pumping device used for pumping the mixed fluid and discharging layered mixed fluid layer by layer, a power device used for providing power for the pumping device, a collecting device used for collecting the mixed fluid and a control device, the pumping device comprises a cylinder body enclosing a cylinder cavity and a piston assembly arranged in the cylinder cavity, the cylinder cavity is divided into a plurality of chambers by the piston assembly, the chambers comprise fluid cavities used for pumping and discharging the mixed fluid layer by layer, the fluid cavities are respectively communicated with the probe device and the collecting device through pipelines, the control device comprises a detector used for detecting mixed fluid information, and the detector is arranged on a pipeline communicated with the fluid cavities and the collecting device. According to the embodiment of the invention, the layered mixed fluid is discharged layer by layer through the pumping device, and the layered fluid information is detected by the detector, so that the real-time prediction of the saturation of the crude oil in the sample pipeline is realized.

Description

Pumping device, sampling system and sampling method

Technical Field

The invention relates to the technical field of logging while drilling, in particular to a pumping device, a sampling system and a sampling method.

Background

In oil exploration, predicting the crude oil saturation of formation fluid is important for judging the quality of crude oil. At present, a modular Formation pressure measuring and sampling instrument (EFDT) is mainly adopted at home to test Formation pressure, sample and analyze Formation fluid and the like. After the probe is seated against the borehole wall, the EFDT piston pump generates a negative pressure that draws formation fluid into the instrument sample line and stores the fluid sample in the sample cylinder at the appropriate time. The formation fluid extracted is typically a multiphase flow, a mixed material, or a single phase unknown fluid.

However, the test method in the related art cannot predict the saturation of the crude oil in the sample pipeline in real time, i.e. the proportion of the volume of the crude oil to the total volume of the sample fluid, and only after the instrument is lifted up to the ground, the oil-water ratio of the liquid in the sample cylinder is measured, so that the selection of the sampling time cannot be guided in time during the operation. And the high-temperature and high-pressure environment is different from the aboveground normal-temperature and normal-pressure environment, and the measurement method in the related technology also has the problem of inaccurate measurement.

Disclosure of Invention

The embodiment of the invention provides a pumping device, a sampling system and a sampling method, which are used for solving the problem that the crude oil saturation in a sample pipeline cannot be predicted in real time in the related technology.

An embodiment of the present invention provides a sampling system, including: the device comprises a probe device used for clinging to formation mixed fluid, a pumping device used for extracting the mixed fluid and discharging layered mixed fluid layer by layer, a power device used for providing power for the pumping device, a collecting device used for collecting the mixed fluid and a control device, wherein the pumping device comprises a cylinder body enclosing a cylinder cavity and a piston assembly arranged in the cylinder cavity, the cylinder cavity is divided into a plurality of cavities by the piston assembly, the plurality of cavities comprise fluid cavities used for extracting and discharging the mixed fluid layer by layer when the piston assembly moves, the fluid cavities are respectively communicated with the probe device and the collecting device through pipelines, the control device comprises a detector used for detecting mixed fluid information and a controller used for controlling the power device, the pumping device and the probe device to execute actions, and the detector is arranged on the pipeline communicated with the fluid cavities and the collecting device.

The embodiment of the invention also provides a pumping device which is applied to the sampling system and comprises a cylinder body and a piston assembly, wherein the cylinder body is enclosed into a cylinder cavity, the piston assembly is arranged in the cylinder cavity, the cylinder cavity is divided into a plurality of chambers by the piston assembly, and the chambers comprise fluid cavities for pumping and discharging the mixed fluid layer by layer when the piston assembly moves.

The embodiment of the invention also provides a sampling method, which comprises the following steps:

extracting the mixed fluid in the fluid cavity, layering the mixed fluid in the fluid cavity, and discharging the layered mixed fluid layer by layer;

and detecting the information of the discharged mixed fluid, and obtaining the crude oil saturation of the mixed fluid according to the obtained mixed fluid information.

According to the embodiment of the invention, the layered mixed fluid is discharged layer by layer through the pumping device, and the layered fluid information is detected by the detector, so that the saturation of the crude oil in the sample pipeline is predicted in real time, and the sampling time is guided in time. And the mixed fluid information is obtained in the high-temperature and high-pressure environment in the well, so that the obtained mixed fluid information is more accurate.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a block diagram of a sampling system according to an embodiment of the present invention;

FIG. 2 is a functional short section structure diagram of a sampling system in an embodiment of the invention;

fig. 3 is a structural view of a pumping apparatus according to an embodiment of the present invention;

FIG. 4a is a diagram of a first stage of the operation of a sampling system according to an embodiment of the present invention;

FIG. 4b is a diagram of a second stage of the operation of a sampling system according to an embodiment of the present invention;

FIG. 5 is a graph of density of a mixed fluid measured by a sampling system according to an embodiment of the present invention over time;

FIG. 6 is a graph of the conductivity of a mixed fluid measured by a sampling system according to an embodiment of the present invention over time;

figure 7 is a block diagram of another pumping arrangement according to an embodiment of the present invention;

FIG. 8a is a diagram of a first phase of the operation of another sampling system according to an embodiment of the present invention;

FIG. 8b is a second stage of the operation of another sampling system according to the present invention.

Figure 9 is a block diagram of another pumping arrangement according to an embodiment of the present invention.

FIG. 10a is a diagram of a first phase of the operation of another sampling system according to an embodiment of the present invention;

FIG. 10b is a second stage diagram of another sampling system according to an embodiment of the present invention.

Description of the reference numerals

1-a sampling system, 100-a probe device; 110-a probe; 120-a pushing mechanism; 131-pushing against the injection-compression connecting pipe; 132-pushing against the back pressure connecting conduit; 133-push against injection valve; 134-push back pressure valve; 100 a-probe nipple; 200-a pumping means; 210-cylinder, 211-top; 212-bottom; 213-a side wall; 220-a piston assembly; 221-a first piston; 222-a second piston; 223-a spacer; 231-a partial pressure chamber; 232-a fluid cavity; 241-a first chamber; 242-a second chamber; 243-a third chamber; 244-a fourth chamber; 200 a-pumping nipple; 300-a power plant; 310-a fuel tank; 320-a hydraulic pump; 300 a-power nipple; 400-a collecting device; 400a-PVT short section; 510-a detector; 511-conductivity detector; 512-density detector; 520-a controller; 500 a-fluid identification nipple; 610-injection-molding a pipeline; 611-a first injection-compression connecting pipe; 612-first injection valve; 613-second injection-molded connecting pipe; 614-second injection valve; 620-back pressure pipe; 621-a first back pressure connection pipe; 622 — first back pressure valve; 623-a second back pressure connecting pipeline; 624-second back pressure valve; 630-a sampling pipe; 631-a first sampling connection pipe; 632-a first sampling valve; 633-a second sampling connection pipe; 634-a second sampling valve; 640-a drainage pipeline; 641-first sample connection conduit; 642-first sample discharge valve; 643 — a second drain connection conduit; 644 — second drain valve; 2-crude oil, 3-water.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In oil exploration, predicting the crude oil saturation of formation fluid is important for judging the quality of crude oil. At present, a modular Formation pressure measuring and sampling instrument (EFDT) is mainly adopted at home to test Formation pressure, sample and analyze Formation fluid and the like. However, the test method in the related art cannot predict the saturation of the crude oil in the sample pipeline in real time, the saturation of the crude oil is the proportion of the volume of the crude oil to the total volume of the sample fluid, and the oil-water ratio of the liquid in the sampling cylinder can only be measured after the instrument is lifted up to the ground, so that the selection of the sampling time cannot be guided in time during the operation. And the high-temperature and high-pressure environment is different from the aboveground normal-temperature and normal-pressure environment, and the measurement method in the related technology also has the problem of inaccurate measurement.

In order to solve the problem that the crude oil saturation in a sample pipeline cannot be predicted in real time in the related art, the embodiment of the invention provides a sampling system, which comprises a probe device used for being attached to a stratum to mix fluid, a pumping device used for pumping the mixed fluid and discharging the layered mixed fluid layer by layer, a power device used for providing power for the pumping device, a collecting device used for collecting the mixed fluid and a control device, wherein the pumping device comprises a cylinder body enclosing a cylinder cavity and a piston assembly arranged in the cylinder cavity, the cylinder cavity is divided into a plurality of chambers by the piston assembly, the plurality of chambers comprise fluid cavities used for pumping and discharging the mixed fluid layer by layer when the piston assembly moves, the fluid cavities are respectively communicated with the probe device and the collecting device through pipelines, and the control device comprises a detector used for detecting the mixed fluid information and a controller used for controlling the power device, the pumping device and the probe device to perform actions, the detector is arranged on a pipeline for communicating the fluid cavity with the collecting device.

In an exemplary embodiment, the present invention provides a sampling system, which includes a probe device for mixing fluid against a formation, a pumping device for pumping the mixed fluid and discharging layered mixed fluid layer by layer, a power device for powering the pumping device, a collecting device for collecting the mixed fluid, and a control device, wherein the pumping device includes a cylinder body enclosing a cylinder cavity and a piston assembly disposed in the cylinder cavity, the piston assembly divides the cylinder cavity into a pressure cavity for injecting pressure and moving the piston assembly, and a fluid cavity for extracting and discharging the mixed fluid layer by layer when the piston assembly moves, the pressure cavity is communicated with the power device through a pipeline, the fluid cavity is communicated with the probe device and the collecting device through pipelines, the control device includes a detector for detecting information of the mixed fluid and a controller for controlling the power device, the pumping device and the probe device to perform actions, the detector is arranged on a pipeline for communicating the fluid cavity with the collecting device.

The technical scheme of the sampling system of the embodiment of the invention is specifically described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a sampling system according to an embodiment of the present invention. As shown in fig. 1, the sampling system 1 includes a probe apparatus 100, a pumping apparatus 200, a power apparatus 300, a collection apparatus 400, and a control apparatus. The probe device 100 is used for abutting against a well wall and providing a channel for pumping mixed fluid, the pumping device 200 comprises a cylinder body 210 enclosing a cylinder cavity and a piston assembly 220 arranged in the cylinder cavity, the piston assembly divides the cylinder cavity into a pressure cavity 231 for injecting pressure and enabling the piston assembly 220 to reciprocate and a fluid cavity 232 for pumping and discharging the mixed fluid layer by layer when the piston assembly 220 reciprocates, the pressure cavity 231 is communicated with the power device 300 through a pipeline, the fluid cavity 232 is respectively communicated with the probe device 100 and the collecting device 400 through a pipeline, the power device 300 injects pressure into the pressure cavity 231 to enable the piston assembly 220 to reciprocate, when the piston assembly 220 reciprocates, the fluid cavity 232 pumps the mixed fluid and discharges the layered mixed fluid to the collecting device 400 layer by layer, and the control device comprises a detector 510 for detecting information of the mixed fluid and a controller for controlling the power device 300, The pumping device 200 and the probe device 100 execute the action of the controller 520, and the saturation of the crude oil in the mixed fluid is obtained in real time according to the detected information of the mixed fluid.

Fig. 2 is a functional short section structure diagram of a sampling system in the embodiment of the invention.

As shown in fig. 1 and 2, the probe device 100 includes a probe 110 and an urging mechanism 120. The pushing mechanism 120 is communicated with the injection pressure pipeline 610 through a pushing injection pressure connecting pipeline 131 and communicated with a back pressure pipeline 620 through a pushing back pressure connecting pipeline 132, a pushing back injection pressure valve 133 is arranged on the injection pressure connecting pipeline 131, a pushing back pressure valve 134 is arranged on the pushing back pressure connecting pipeline 132, the pushing mechanism 120 enables the probe 110 to extend out under the driving of the power device 300 and to be attached to the well wall, the probe 110 is of a hollow structure, and the probe 110 is communicated with the sampling pipeline 630. Probe device 100 sets up on the probe nipple joint 100a of sampling system function nipple joint to be located the lower extreme of a plurality of function nipple joints of sampling system, wherein the one end of entering the well first when the lower extreme drops into the well for sampling system function nipple joint. The specific structure of the probe apparatus 100 may adopt the existing structure in the EFDT function module, and is not limited herein.

Fig. 3 is a structural view of a pumping apparatus according to an embodiment of the present invention. As shown in fig. 1-3, the pumping device 200 includes a cylinder block 210 and a piston assembly 220. The cylinder body 210 includes a top 211, a bottom 212, a side wall 213 and a partition 214, the top 211, the bottom 212 and the side wall 213 enclose a cylinder cavity, the edge of the partition 214 is connected to the side wall 213 and divides the cylinder cavity into two chambers, a through hole is provided on the partition 214, the piston assembly 220 is disposed in the cylinder cavity, the piston assembly 220 includes a first piston 221 disposed between the top 211 and the partition 214, a second piston 222 disposed between the partition 214 and the bottom 212, and a connecting rod 223 disposed through the through hole and connecting the first piston 221 and the second piston 222, a first chamber 241 is formed between the first piston 221 and the top 211, a second chamber 242 is formed between the first piston 221 and the partition 214, a third chamber 243 is formed between the second piston 222 and the partition 214, a fourth chamber 244 is formed between the second piston 222 and the bottom 212, wherein the first chamber 241 and the second chamber 242 are provided as a pressure chamber 231, a third chamber 243 and a fourth chamber 244 are provided as the fluid chamber 232. The pumping device 200 further comprises a pressure injection connecting pipeline for communicating the pressure injection pipeline 610 and the pressure cavity 231 and a back pressure connecting pipeline arranged on the pressure injection connecting pipeline and used for communicating the back pressure pipeline 620, wherein the pressure injection connecting pipeline is provided with a pressure injection valve, the communication position of the pressure injection connecting pipeline and the back pressure connecting pipeline is positioned between the pressure injection valve and the cylinder body 210, and the back pressure connecting pipeline is provided with a back pressure valve. The pumping device also comprises a sampling connecting pipeline used for communicating the sampling pipeline 630 and the fluid cavity 232 and a liquid discharging connecting pipeline used for communicating the liquid discharging pipeline 640 and the fluid cavity 232, wherein the sampling connecting pipeline is provided with a sampling valve, and the liquid discharging connecting pipeline is provided with a sample discharging valve. In one example, the pumping device includes a first injection connecting pipe 611 disposed at a position of the first chamber 241 near the top 211 and communicating the first chamber 241 with the injection pipe 610, and a first back pressure connecting pipe 621 disposed on the first injection connecting pipe 611 and communicating with the back pressure pipe 620, a first injection valve 612 is disposed on the first injection connecting pipe 611, a position of the first injection connecting pipe 611 communicating with the first back pressure connecting pipe 621 is located between the first injection valve 612 and the cylinder 210, and a first back pressure valve 622 is disposed on the first back pressure connecting pipe 621. The pumping device further includes a second injection connecting pipe 613 disposed at a position of the second chamber 242 near the partition 214 and communicating the second chamber 242 with the injection pipe 610, and a second back pressure connecting pipe 623 disposed at the second injection connecting pipe 613 and communicating with the back pressure pipe 620, wherein a second injection valve 614 is disposed at the second injection connecting pipe 613, a communication position of the second injection connecting pipe 613 with the second back pressure connecting pipe 623 is located between the second injection valve 614 and the cylinder 210, and a second back pressure valve 624 is disposed at the second back pressure connecting pipe 623. The pumping device further includes a first sampling connection pipe 631 communicating the third chamber 243 with the sampling pipe 630 and a first discharge connection pipe 641 communicating the third chamber 243 with the discharge pipe 640, the third chamber 243 is close to the partition 214 in communication with the first sampling connection pipe 631 and the first discharge connection pipe 641, the first sampling valve 632 is arranged on the first sampling connection pipe 631, and the first discharge valve 642 is arranged on the first discharge connection pipe 641. The pumping device 200 further includes a second sampling connection pipe 633 for communicating the fourth chamber 244 with the sampling pipe 630, and a second discharging connection pipe 643 for communicating the fourth chamber 244 with the discharging pipe 640, the communication positions of the fourth chamber 244 with the second sampling connection pipe 633 and the second discharging connection pipe 643 are both near the bottom 212, a second sampling valve 634 is disposed on the second sampling connection pipe 633, and a second discharging valve 644 is disposed on the second discharging connection pipe 643. In the present embodiment, the communication positions of the first injection-pressure connecting pipe 611, the second injection-pressure connecting pipe 613, the first sampling connecting pipe 631, the second sampling connecting pipe 633, the first discharge connecting pipe 641, and the second discharge connecting pipe 643 with the cylinder 210 are all located on the side wall 213 of the cylinder 210. In this embodiment, the pumping device 200 may be disposed in a pumping sub 200a of the sampling system functional sub, the pumping sub 200a being located above the probe sub 100a and in close proximity to the probe sub 100 a.

As shown in fig. 1 and 2, the power plant 300 provides power for the pumping device 200 to draw and discharge the mixed fluid. The power device 300 includes an oil tank 310 and a hydraulic pump 320, the oil tank 310 is respectively communicated with an injection pressure pipeline 610 and a back pressure pipeline 620, and the hydraulic pump 320 is disposed on the injection pressure pipeline 610. The hydraulic medium injected into the pressure chamber 231 may be oil. Power device 300 sets up power nipple joint 300a in the function nipple joint of sampling system, and power nipple joint 300a is located the top of the function nipple joint of sampling system.

As shown in fig. 1 and 2, the collection device 400 includes a sampling barrel, which is in communication with the outlet of the drain line 640, and the pumping device 200 discharges the mixed fluid into the sampling barrel. The collecting device 400 is arranged on a Pressure-Volume-Temperature (PVT) nipple 400a in a functional nipple of the sampling system, and the PVT nipple 400a is arranged at the lower end of the power nipple 300a and is close to the power nipple 300 a.

As shown in fig. 1 and 2, the control device includes a detector 510 for detecting information of the mixed fluid, and a controller 520 for controlling the power device 300, the pumping device 200, and the probe device 100 to perform actions, the detector 510 is disposed on the liquid discharge pipe 640, the detector 510 may include a conductivity detector 511 for detecting conductivity information of the mixed fluid in the liquid discharge pipe 640, and a density detector 512 for detecting density information of the mixed fluid in the liquid discharge pipe 640, and the information of the mixed fluid detected by the detector 510 may be uploaded to the controller 520, and saturation of crude oil in the mixed fluid may be obtained through data processing. Detector 510 is disposed in a functional sub of the sampling system, fluid discriminating sub 500a is disposed between PVT sub 400a and pumping sub 200a, and fluid drain 640 passes through fluid discriminating sub 500 a.

The technical solution of the embodiment of the present invention is further described by the working principle of the sampling system of the embodiment of the present invention.

Fig. 4a is a first stage diagram of the operation principle of the sampling system according to the embodiment of the present invention, and fig. 4b is a second stage diagram of the operation principle of the sampling system according to the embodiment of the present invention.

When the sampling system reaches the sampling position of the mixed fluid in the formation in the well, the power device injects pressure to the pushing mechanism, and the pushing mechanism drives the probe to extend out to be attached to the sampling position of the mixed fluid on the well wall.

As shown in fig. 4a, the first piston 221 is at the uppermost end of the cylinder chamber. The first injection valve 612, the second back pressure valve 624, the first sampling valve 632, and the second discharge valve 644 are opened, the second injection valve 614, the first back pressure valve 622, the second sampling valve 634, and the first discharge valve 642 are closed, the hydraulic pump injects the hydraulic medium into the first chamber 241 through the injection pipe 610 and the first injection connecting pipe 611, the pressure may be 20MPa to 30MPa, the first piston 221 starts to move downward until the partition 214 is touched, in the process, the second piston 222 also moves downward, and as the second piston 222 descends, the mixed fluid is drawn into the third chamber 243 through the probe, the sampling pipe 630 and the first sampling connection pipe 631, the mixed fluid is layered in the third chamber 243 by gravity, with water 3 in the lower layer and crude oil 2 in the upper layer, completing the first stage of the pump shaft, i.e., the a-B-C process in fig. 4 a.

As shown in fig. 4b, the second injection valve 614, the first back pressure valve 622, the second sampling valve 634 and the first sample discharge valve 642 are opened, the first injection valve 612, the second back pressure valve 624, the first sampling valve 632 and the second sample discharge valve 644 are closed, the hydraulic pump injects hydraulic medium into the second chamber 242 through the injection pipe 610 and the second injection connecting pipe 613, the pressure can be 20MPa to 30MPa, the first piston 221 starts to move upwards until the top 211 is reached, the hydraulic medium in the first chamber 241 is pressed by the first piston and returns to the oil tank through the first back pressure connecting pipe 621 and the back pressure pipe 621, in the process, the second piston 222 also moves upwards, and as the second piston rises, the mixed fluid is pumped into the fourth chamber 244 through the probe, the sampling pipe 630 and the second sample connecting pipe 633, the mixed fluid in the fourth chamber 244 is layered due to gravity, meanwhile, the layered mixed fluid in the third chamber 243 is extruded by the second piston 222 and discharged into the sampling barrel layer by layer through the first stock discharge connecting pipe 641 and the stock discharge pipe 640, wherein the crude oil 2 is discharged first, so that the pumping inversion is realized, and the second stage, i.e., the process C-B-a in fig. 4B, is completed. The conductivity detector and the density detector disposed on the drainage conduit 640 may detect information of the mixed fluid as it is discharged from the third chamber 243.

And then the first stage and the second stage are carried out, wherein in the process of the first stage, the third chamber 243 is filled with the mixed fluid, and the mixed fluid layered in the fourth chamber 244 is discharged into the sampling barrel according to the sequence of water 3-crude oil 2. During the second stage, the fourth chamber 244 is filled with the mixed fluid, and the mixed fluid stratified in the third chamber 243 is discharged into the sampling barrel in the sequence of crude oil 2-water 3.

In the above manner, the first phase and the second phase are taken as periods and are circularly performed. In the circulation process, the periodic circulation discharge of water, crude oil and water can be realized, and slug flow is formed.

Fig. 5 is a graph showing the density of the mixed fluid measured by the sampling system according to the embodiment of the present invention as a function of time, and fig. 6 is a graph showing the conductivity of the mixed fluid measured by the sampling system according to the embodiment of the present invention as a function of time. As shown in fig. 5 and 6, the fluid pumped by the pumping device is mainly mud and has a small amount of solid, the small amount of solid forms a mud cake, before the mud cake is broken through, the slurry filtrate flows through the discharge pipeline, the mud filtrate can be regarded as an electrolyte aqueous solution, the density of the electrolyte aqueous solution is close to that of water in the area on the left side of the dotted line a in fig. 5, and the conductivity of the electrolyte aqueous solution is about 20S/m in the area on the left side of the dotted line B in fig. 6, and after the mud cake is broken through, the formation mixed fluid flows into a drainage channel, and at the moment, the crude oil and water slug flow can be observed. As shown in FIG. 5, after the slug flow is formed, the density of the mixed fluid begins to periodically fluctuate between 0.95g/cc and 1.1g/cc, water seeped into the formation by the mud is pumped out completely with the extension of the sampling time, and the mixed fluid is gradually dominated by crude oil, namely, the density of the mixed fluid floats at the position of 0.95g/cc after 2700s as shown in FIG. 5. As shown in FIG. 6, after the slug flow is formed, the conductivity of the mixed fluid periodically fluctuates between 0.5S/m and 18S/m, the water of the slurry penetrating into the stratum is completely extracted along with the prolonging of the sampling time, the mixed fluid is mainly crude oil gradually, namely, the conductivity of the mixed fluid is kept at about 0.5S/m after 2700S shown in FIG. 6. In this embodiment, the information of the mixed fluid can be observed in real time in the sampling time, the saturation of the crude oil is obtained according to the ratio of the crude oil time length to the total sampling time length, and the sampling time is guided in time during the operation.

In this embodiment, first notes pressure connecting tube and second notes pressure connecting tube are notes pressure connecting tube, first notes pressure valve and second notes pressure valve are notes pressure valve, first back pressure connecting tube and second back pressure connecting tube are back pressure connecting tube, first back pressure valve and second back pressure valve are back pressure valve, first sample connecting tube and second sample connecting tube are sample connecting tube, first sample valve and second sample valve are sample valve, first row's appearance connecting tube and second row's appearance connecting tube are row's appearance connecting tube, first row's appearance valve and second row's appearance valve are row's appearance valve, notes pressure valve, back pressure valve, sample valve and row's appearance valve all are connected with the controller, controller control notes pressure valve, back pressure valve, sample valve and row's appearance valve open and close. Annotate and press the pipeline and annotate and press connecting tube, back pressure pipeline and back pressure connecting tube, sample pipeline and sample connecting tube and stock layout pipeline and stock layout connecting tube can be for the tubular pipeline also can be for setting up the passageway on the nipple joint body, do not do the restriction here. In some embodiments, a piston in the fluid chamber may be driven to reciprocate by a cylinder or a lead screw motor, and the pressure chamber is only an alternative power way for pumping and discharging the mixed fluid.

In an exemplary embodiment, another sampling system is provided in accordance with an embodiment of the present invention, which differs from the above-described embodiments in the configuration of the pumping arrangement. Figure 7 is a block diagram of another pumping arrangement according to an embodiment of the present invention. As shown in fig. 7, the first and

fourth chambers

241 and 244 are provided as the pressure chamber 231, and the second and

third chambers

242 and 243 are provided as the fluid chamber 232. The pumping device comprises a first injection pressure connecting pipeline 611 arranged at a position of the first chamber 241 close to the top 211 and communicating the first chamber 241 with the injection pressure pipeline 610, and a first return pressure connecting pipeline 621 arranged on the first injection pressure connecting pipeline 611 and communicating with the return pressure pipeline 620, wherein a first injection pressure valve 612 is arranged on the first injection pressure connecting pipeline 611, a communication position of the first injection pressure connecting pipeline 611 and the first return pressure connecting pipeline 621 is arranged between the first injection pressure valve 612 and the cylinder body 210, and a first return valve 622 is arranged on the first return pressure connecting pipeline 621. The pumping device further includes a second injection connecting pipe 613 disposed at a position of the fourth chamber 244 near the bottom 212 and communicating the fourth chamber 244 with the injection pipe 610, and a second back pressure connecting pipe 623 disposed on the second injection connecting pipe 613 and communicating with the back pressure pipe 620, wherein a second injection valve 614 is disposed on the second injection connecting pipe 613, a communication position of the second injection connecting pipe 613 and the second back pressure connecting pipe 623 is located between the second injection valve 614 and the cylinder 210, and a second back pressure valve 624 is disposed on the second back pressure connecting pipe 623. The pumping device further includes a first sampling connection pipe 631 communicating the second chamber 242 with the sampling pipe 630 and a first discharge connection pipe 641 communicating the second chamber 242 with the discharge pipe 640, the second chamber 242 is close to the partition 214 in communication with the first sampling connection pipe 631 and the first discharge connection pipe 641, the first sampling valve 632 is disposed on the first sampling connection pipe 631, and the first discharge valve 642 is disposed on the first discharge connection pipe 641. The pumping device 200 further includes a second sampling connection pipe 633 for communicating the third chamber 243 and the sampling pipe 630, and a second discharging connection pipe 643 for communicating the third chamber 243 and the discharging pipe 640, the communication positions of the third chamber 243, the second sampling connection pipe 633 and the second discharging connection pipe 643 are both close to the partition 214, a second sampling valve 634 is disposed on the second sampling connection pipe 633, and a second discharging valve 644 is disposed on the second discharging connection pipe 643.

Fig. 8a is a first stage diagram of another sampling system according to the present invention, and fig. 8b is a second stage diagram of another sampling system according to the present invention.

As shown in fig. 8a, the first piston 221 is at the uppermost end of the cylinder chamber. The first injection valve 612, the second back pressure valve 624, the second sampling valve 634, and the first discharge valve 642 are opened, the second injection valve 614, the first back pressure valve 622, the first sampling valve 632, and the second discharge valve 644 are closed, the hydraulic pump injects a hydraulic medium into the first chamber 241 through the injection pipe 610 and the first injection connecting pipe 611, the pressure of the medium may be 20MPa to 30MPa, the first piston 221 starts to move downward until the spacer 214 is touched, in the process, the second piston 222 also moves downward, and as the second piston 222 descends, the mixed fluid is drawn into the third chamber 243 through the probe, the sampling pipe 630 and the second sampling connection pipe 633, the mixed fluid is layered in the third chamber 243 due to the gravity, with water 3 in the lower layer and crude oil 2 in the upper layer, completing the first stage of the pump shaft, i.e., the a-B-C process in fig. 8 a.

As shown in fig. 8b, the second injection valve 614, the first back pressure valve 622, the first sampling valve 632 and the second discharge valve 644 are opened, the first injection valve 612, the second back pressure valve 624, the second sampling valve 634 and the first discharge valve 642 are closed, the hydraulic pump injects the hydraulic medium into the fourth chamber 242 through the injection pipe 610 and the second injection connecting pipe 613, the pressure may be 20MPa to 30MPa, the second piston 221 starts to move upwards until the partition 214 is reached, the hydraulic medium in the first chamber 241 is pressed by the first piston and is returned to the oil tank through the first back pressure connecting pipe 621 and the back pressure pipe 621, in the process, as the second piston 222 ascends, the mixed fluid is pumped into the second chamber 242 through the probe, the sampling pipe 630 and the first sampling connecting pipe 631, the mixed fluid in the second chamber 242 is layered due to gravity, and the layered mixed fluid in the third chamber is pressed by the second piston 222 and is layered through the second discharge connecting pipe 643 and the second discharge valve 642 The stock removal pipe 640 discharges layer by layer into the sampling barrel, wherein the crude oil 2 is discharged first, realizing the inversion of the pump, and completing the second stage, i.e. the process C-B-a in fig. 8B.

And then, performing the first stage and the second stage, wherein the third chamber 243 is filled with the mixed fluid during the first stage, and the layered mixed fluid in the second chamber 242 is discharged into the sampling barrel according to the sequence of water 3-crude oil 2. During the second stage, the second chamber 242 is filled with the mixed fluid, and the mixed fluid layered in the third chamber 243 is discharged into the sampling barrel in the sequence of crude oil 2-water 3.

The embodiment of the invention provides another implementation mode of the sampling system, and the implementation mode has the same technical effects as the embodiment.

In an exemplary embodiment, another sampling system is provided in accordance with an embodiment of the present invention, which differs from the above-described embodiments in the configuration of the pumping arrangement. Figure 9 is a block diagram of another pumping arrangement according to an embodiment of the present invention. As shown in fig. 9, the second chamber 242 and the third chamber 243 are provided as the pressure chamber 231, and the first chamber 241 and the fourth chamber 244 are provided as the fluid chamber 232. The pumping device comprises a first injection connecting pipeline 611 arranged at a position of the second chamber 242 close to the partition 214 and communicating the second chamber 242 with the injection pipeline 610, and a first return connecting pipeline 621 arranged on the first injection connecting pipeline 611 and communicating with the return pipeline 620, wherein a first injection valve 612 is arranged on the first injection connecting pipeline 611, a communication position of the first injection connecting pipeline 611 and the first return connecting pipeline 621 is arranged between the first injection valve 612 and the cylinder 210, and a first return valve 622 is arranged on the first return connecting pipeline 621. The pumping device further includes a second injection connecting pipe 613 disposed at a position where the third chamber 243 is close to the partition 214 and communicating the third chamber 243 with the injection pipe 610, and a second back pressure connecting pipe 623 disposed at the second injection connecting pipe 613 and communicating with the back pressure pipe 620, wherein a second injection valve 614 is disposed at the second injection connecting pipe 613, a communication position of the second injection connecting pipe 613 with the second back pressure connecting pipe 623 is located between the second injection valve 614 and the cylinder 210, and a second back pressure valve 624 is disposed at the second back pressure connecting pipe 623. The pumping device further comprises a first sampling connecting pipe 631 communicating the first chamber 241 with the sampling pipe 630 and a first discharging connecting pipe 641 communicating the first chamber 241 with the discharging pipe 640, the first chamber 241 is close to the top 211 through the first sampling connecting pipe 631 and the first discharging connecting pipe 641, a first sampling valve 632 is arranged on the first sampling connecting pipe 631, and a first discharging valve 642 is arranged on the first discharging connecting pipe 641. The pumping device 200 further includes a second sampling connection pipe 633 for communicating the fourth chamber 244 with the sampling pipe 630 and a second discharging connection pipe 643 for communicating the fourth chamber 244 with the discharging pipe 640, the communication positions of the fourth chamber 244 with the second sampling connection pipe 633 and the second discharging connection pipe 643 are both close to the bottom 212, a second sampling valve 634 is disposed on the second sampling connection pipe 633, and a second discharging valve 644 is disposed on the second discharging connection pipe 643.

Fig. 10a is a first stage diagram of another sampling system according to another embodiment of the present invention, and fig. 10b is a second stage diagram of another sampling system according to another embodiment of the present invention.

As shown in fig. 10a, the first piston 221 is at the uppermost end of the cylinder cavity, the second injection valve 614, the first back pressure valve 622, the first sampling valve 632 and the second discharge valve 644 are opened, the first injection valve 612, the second back pressure valve 624, the second sampling valve 634 and the first discharge valve 642 are closed, the hydraulic pump injects hydraulic medium into the third chamber 243 through the injection pipe 610 and the second injection connecting pipe 613, the pressure can be 20MPa to 30MPa, the second piston 222 starts to move downwards until reaching the bottom 212, in the process, the first piston 221 also moves downwards, the mixed fluid is pumped into the first chamber 241 through the probe, the sampling pipe 630 and the first sampling connecting pipe 631 along with the descending of the first piston, the mixed fluid is stratified in the first chamber 241 due to the gravity, wherein the water 3 is at the lower layer, the crude oil 2 is at the upper layer, and the first stage of the pump shaft is completed, as shown in the a-B-C process of fig. 10 a.

As shown in fig. 10b, the first injection valve 612, the second back pressure valve 624, the second sampling valve 634 and the first sample valve 642 are opened, the second injection valve 614, the first back pressure valve 622, the first sampling valve 632 and the second sample valve 644 are closed, the hydraulic pump injects the hydraulic medium into the second chamber 242 through the injection pipe 610 and the first injection connecting pipe 611, the pressure can be 20MPa to 30MPa, the first piston 221 starts to move upward until reaching the top 211, and the hydraulic medium in the third chamber 242 returns to the oil tank through the second back pressure connecting pipe 623 and the back pressure pipe under the extrusion of the second piston 222. In this process, as the first piston 221 ascends, the mixed fluid is pumped into the fourth chamber 244 through the probe, the sampling pipe 630 and the second sampling connection pipe 633, the mixed fluid in the fourth chamber 244 is layered due to gravity, and the layered mixed fluid in the first chamber 241 is discharged into the sampling barrel layer by layer through the first drainage connection pipe 641 and the drainage pipe 640 under the extrusion of the first piston 221, wherein the crude oil 2 is discharged first, and the pumping inversion is realized, and the second stage, i.e., the C-B-a process shown in fig. 10B, is completed.

And then, the first stage and the second stage are carried out, in the process of the first stage, the first chamber 241 is gradually filled with the mixed fluid, and the mixed fluid layered in the fourth chamber 244 is discharged into the sampling barrel according to the sequence of water 3-crude oil 2. During the second stage, the fourth chamber 244 is gradually filled with the mixed fluid, and the mixed fluid layered in the first chamber 241 is discharged into the sampling barrel in the sequence of crude oil 2-water 3.

In the above manner, the first phase and the second phase are taken as periods and are circularly performed. In the circulation process, the water 3-crude oil 2-water 3 can be discharged in a periodic circulation mode to form slug flow.

In an exemplary embodiment, the embodiment of the present invention provides a pump shaft device, as shown in fig. 3, 7 and 9, including a cylinder block 210 enclosing a cylinder cavity and a piston assembly 220 disposed in the cylinder cavity, the piston assembly 200 dividing the cylinder cavity into a plurality of chambers including a fluid cavity 232 for pumping and discharging a mixed fluid layer by layer as the piston assembly 200 moves.

In some embodiments, as shown in fig. 3, 7 and 9, the plurality of chambers further includes a pressure chamber 231 for injecting pressure and moving the piston assembly 220, the pressure chamber 231 being in communication with the power device through a conduit.

In some embodiments, as shown in fig. 3, the cylinder 210 includes a top 211, a bottom 212, a side wall 213 and a partition 214, the top 211, the bottom 212 and the side wall 213 enclose a cylinder cavity, an edge of the partition 214 is connected to the side wall 213, the partition 214 is provided with a through hole, the piston assembly 220 includes a first piston 221 disposed between the top 211 and the partition 214, a second piston 222 disposed between the partition 214 and the bottom 212, and a connecting rod 223 disposed through the through hole and connecting the first piston 221 and the second piston 222, a first chamber 241 is formed between the first piston 221 and the top 211, a second chamber 242 is formed between the first piston 221 and the partition 214, a third chamber 243 is formed between the second piston 222 and the partition 214, and a fourth chamber 244 is formed between the second piston 222 and the bottom 212.

In some embodiments, as shown in fig. 3, the first and

second chambers

241, 242 are provided as pressure chambers 231, and the third and

fourth chambers

243, 244 are provided as fluid chambers 232; or, as shown in fig. 7, the first chamber 241 and the fourth chamber 244 are pressure chambers 231, and the second chamber 242 and the third chamber 243 are fluid chambers 232; alternatively, as shown in fig. 9, the second and

third chambers

242 and 243 are pressure chambers 231, and the first and

fourth chambers

241 and 244 are fluid chambers 232.

In some embodiments, as shown in fig. 1 and 3, the pumping device further includes a pressure injection connecting pipe for communicating the pressure injection pipe 610 and the pressure chamber 231, a pressure return connecting pipe disposed on the pressure injection connecting pipe for communicating the pressure return pipe 620, a sampling connecting pipe for communicating the sampling pipe 630 and the fluid chamber 232, and a fluid discharge connecting pipe for communicating the fluid discharge pipe 640 and the fluid chamber 232, wherein a pressure injection valve is disposed on the pressure injection connecting pipe, a communication position between the pressure injection connecting pipe and the pressure return connecting pipe is located between the pressure injection valve and the cylinder, a pressure return valve is disposed on the pressure return connecting pipe, a sampling valve is disposed on the sampling connecting pipe, and a sample discharge valve is disposed on the fluid discharge connecting pipe.

In some embodiments, a fluid chamber including a first fluid chamber and a second fluid chamber, a mixed fluid is pumped into the fluid chamber, the mixed fluid is layered in the fluid chamber, and the layered mixed fluid is discharged layer by layer, comprising:

when the first fluid cavity extracts the mixed fluid, the second fluid cavity discharges the layered mixed fluid layer by layer;

the first fluid chamber discharges the layered mixed fluid layer by layer, and the second fluid chamber extracts the mixed fluid.

In some embodiments, the mixed fluid information includes mixed fluid density versus time information and/or mixed fluid conductivity versus time information.

According to the embodiment of the invention, the layered mixed fluid information is obtained by discharging the mixed fluid layer by layer after layering, so that the saturation of the crude oil in the sample pipeline is predicted in real time, and the sampling time in operation is guided in time.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A sampling system, comprising: a probe device for mixing fluid against the stratum, a pumping device for pumping the mixed fluid and discharging the layered mixed fluid layer by layer, a power device for providing power for the pumping device, a collecting device for collecting the mixed fluid and a control device, the pumping device comprises a cylinder body which encloses a cylinder cavity and a piston assembly which is arranged in the cylinder cavity and divides the cylinder cavity into a plurality of chambers, the plurality of chambers include fluid chambers for extracting and discharging the mixed fluid layer by layer as the piston assembly moves, the fluid cavity is respectively communicated with the probe device and the collecting device through pipelines, the control device comprises a detector for detecting mixed fluid information and a controller for controlling the power device, the pumping device and the probe device to execute actions, and the detector is arranged on the pipeline for communicating the fluid cavity with the collecting device.

2. The sampling system of claim 1, wherein: the plurality of chambers further include a pressure chamber for injecting pressure and moving the piston assembly, the pressure chamber being in communication with a power device via a conduit.

3. The sampling system of claim 2, wherein: the cylinder body comprises a top, a bottom, side walls and a partition part, wherein a cylinder cavity is defined by the top, the bottom and the side walls, the edge of the partition part is connected to the side walls, and a penetrating hole is formed in the partition part.

4. The sampling system of claim 3, wherein: the piston assembly comprises a first piston arranged between the top and the spacing part, a second piston arranged between the spacing part and the bottom and a connecting rod penetrating through the through hole and connecting the first piston and the second piston, a first chamber is formed between the first piston and the top, a second chamber is formed between the first piston and the spacing part, a third chamber is formed between the second piston and the spacing part, and a fourth chamber is formed between the second piston and the bottom, wherein the first chamber and the second chamber are arranged as the pressure chamber, and the third chamber and the fourth chamber are arranged as the fluid chamber; or the first chamber and the fourth chamber are arranged to be the pressure chamber, the second chamber and the third chamber are arranged to be the fluid chamber, or the second chamber and the third chamber are arranged to be the pressure chamber, and the first chamber and the fourth chamber are arranged to be the fluid chamber.

5. The sampling system of any one of claims 2-4, wherein: the sampling system includes the back pressure pipeline that annotates with the power device intercommunication and communicates with the power device, the pumping device is still including being used for the intercommunication annotate the notes pressure connecting tube of pressing pipeline and pressure chamber with set up in annotate and press on the connecting tube and be used for the intercommunication the back pressure connecting tube of back pressure pipeline, annotate and press and be provided with the notes pressure valve on the connecting tube, annotate on pressing the connecting tube with the intercommunication position of back pressure connecting tube is located between notes pressure valve and the cylinder body, be provided with the back pressure valve on the back pressure connecting tube, the controller with annotate and press valve and back pressure valve to be connected and control annotate opening and closing of pressing valve and back pressure valve.

6. The sampling system of claim 5, wherein: the sampling system include with the sampling tube of probe device intercommunication and with the drain line of collection device intercommunication, the pump pumping device is still including the sample connecting tube who is used for communicateing sampling tube and fluid cavity and the flowing back connecting tube who is used for communicateing drain line and fluid cavity, be provided with sample valve on the sample connecting tube, be provided with the stock layout valve on the flowing back connecting tube, the controller with sample valve and drain valve are connected and are controlled opening and closing of sample valve and drain valve.

7. The sampling system of any one of claims 1-4, wherein: the detector includes a conductivity detector for detecting conductivity information of the mixed fluid and/or a density detector for detecting density information of the mixed fluid.

8. A pumping apparatus for use in a sampling system according to any one of claims 1 to 7, comprising a cylinder defining a cylinder chamber and a piston assembly disposed within the cylinder chamber, the piston assembly dividing the cylinder chamber into a plurality of chambers including a fluid chamber for extracting and discharging the mixed fluid layer by layer as the piston assembly moves.

9. A pumping apparatus according to claim 8, wherein: the plurality of chambers further includes a pressure chamber for injecting pressure and moving the piston assembly, the pressure chamber being disposed in communication with a power device through a conduit.

10. A pumping apparatus according to claim 9, wherein: the cylinder body comprises a top, a bottom, a side wall and a partition part, wherein a cylinder cavity is defined by the top, the bottom and the side wall, the edge of the partition part is connected to the side wall, a penetrating hole is formed in the partition part, the piston assembly comprises a first piston arranged between the top and the partition part, a second piston arranged between the partition part and the bottom, and a connecting rod penetrating through the penetrating hole and connected with the first piston and the second piston, a first cavity is formed between the first piston and the top, a second cavity is formed between the first piston and the partition part, a third cavity is formed between the second piston and the partition part, and a fourth cavity is formed between the second piston and the bottom.

11. A pumping apparatus according to claim 10, wherein: the first chamber and the second chamber are arranged as the pressure cavity, and the third chamber and the fourth chamber are arranged as the fluid cavity; or

The first chamber and the fourth chamber are arranged to be pressure chambers, and the second chamber and the third chamber are arranged to be fluid chambers; or

The second and third chambers are provided as pressure chambers and the first and fourth chambers are provided as fluid chambers.

12. A pumping arrangement according to any of claims 8 to 11, wherein: the pumping device is still including the notes pressure connecting tube that is used for the intercommunication to annotate pressure pipeline and pressure chamber, set up on annotating the pressure connecting tube and be used for the back pressure connecting tube of intercommunication back pressure pipeline, be used for the sample connecting tube of intercommunication sample pipeline and fluidal cavity and be used for the flowing back connecting tube of intercommunication drain line and fluidal cavity, annotate and be provided with on the pressure connecting tube and annotate and press the valve, annotate and press the connecting tube on be located annotate with the intercommunication position of back pressure connecting tube and press between valve and the cylinder body, be provided with back pressure valve on the back pressure connecting tube, be provided with sample valve on the sample connecting tube, be provided with the stock layout valve on the flowing back connecting tube.

13. A method of sampling, comprising:

extracting mixed fluid in a fluid cavity, layering the mixed fluid in the fluid cavity, and discharging the layered mixed fluid layer by layer;

14. The method of claim 13, wherein the fluid chamber comprises a first fluid chamber and a second fluid chamber, the extracting the mixed fluid in the fluid chamber, the mixed fluid stratifying within the fluid chamber, and the discharging the stratified mixed fluid layer by layer, comprises:

the second fluid chamber draws the mixed fluid while the first fluid chamber discharges the layered mixed fluid layer by layer.

15. The sampling method according to claim 13 or 14, wherein the mixed fluid information comprises mixed fluid density versus time information and/or mixed fluid conductivity versus time information.