CN112554870A - Capillary steel pipe pressure measurement interval pumping control device and method - Google Patents
Capillary steel pipe pressure measurement interval pumping control device and method Download PDFInfo
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- 238000005086 pumping Methods 0.000 title claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 68
- 239000010959 steel Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000003129 oil well Substances 0.000 claims abstract description 81
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000012546 transfer Methods 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 20
- 208000019206 urinary tract infection Diseases 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010926 purge Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 5
- 235000017491 Bambusa tulda Nutrition 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 5
- 239000011425 bamboo Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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Abstract
The invention provides a capillary steel tube pressure measurement interval pumping control device and a method, wherein the device comprises a composite cable, a pressure sensor, an oil pipe, a sleeve, a pump barrel, a control cabinet and a nitrogen control device; the composite cable comprises a body and a capillary steel tube, wherein a hollow part is arranged in the body, a cable and a signal wire are connected in the hollow part in a penetrating way, and the capillary steel tube is positioned on one side of the hollow part and in the body; the oil pipe, the sleeve and the pump barrel are arranged in an oil well, the oil pipe is arranged in the sleeve, the lower end of the oil pipe is connected with the pump barrel, and the pressure transfer barrel is sleeved on the oil pipe and is positioned above the pump barrel; the nitrogen control device is arranged on the ground. The invention uses the capillary tube filled with nitrogen to transmit the liquid pressure at the bottom of the well to the ground through gas, and the liquid pressure is converted into digital quantity at the ground through the pressure sensor so as to sense the underground liquid pressure, thereby determining the sinking degree and establishing the open system between oil wells.
Description
Technical Field
The invention relates to the field of oil extraction processes and sensors, in particular to a capillary steel tube pressure measurement interval pumping control device and method.
Technical Field
The Yingqing oil field in Ordos basin belongs to typical low-permeability, low-pressure and low-abundance oil reservoir, and has low oil well yield, more wells and no natural capacity. For low-yield and low-efficiency wells, even after the minimum pumping parameter is adjusted, the phenomenon of 'empty pumping' still exists, so that the problems of large reactive loss, large abrasion of pumping equipment, pipes and rods, short pump inspection period of an oil well and the like are caused. The oil field mainly adopts a spaced mode to solve the air pumping. At present, the oil field is separated according to the oil well output and indicator diagram, the starting and stopping time of the oil well is artificially estimated and determined. The method has two problems that on one hand, the separated well selection standard and the production system lack scientific basis; on the other hand, the intermittent operation is low in automation and intelligence degree, mainly manual intermittent operation is used as a main mode, and the intermittent operation is long in period and fixed. Therefore, the traditional method is unscientific in determining the time interval between the pumping and the pumping stop of the pumping well, cannot change along with the change of the working condition of the pumping well, and has the problems of high requirement on the responsibility of post workers, high management and maintenance difficulty and the like.
The traditional thinning control device mainly comprises an experience method, a power diagram method and the like. The manual experience method mainly utilizes the experience of field personnel and management requirements and the like to make a fixed spacing period, and has no reliable scientific basis. The diagram method mainly utilizes the diagram shape to determine the spacing period, but the error of the calculation process of determining the spacing period through the diagram is larger, and the diagram method has no linkage control function.
Disclosure of Invention
In order to overcome the problems, the invention provides a device and a method for controlling the pressure measurement of the capillary steel pipe of the oil well to pump intermittently. The device can transmit the collected signals to the well site RTU and the upper computer, can realize the real-time remote control of a single well, and realizes the automatic intelligent separation of the oil well.
The technical scheme adopted by the invention is as follows:
a capillary steel pipe pressure measurement interval pumping control device comprises a composite cable, a pressure sensor, an oil pipe, a sleeve, a pump cylinder, a control cabinet and a nitrogen control device; the composite cable comprises a body and a capillary steel tube, wherein a hollow part is arranged in the body, a cable and a signal wire are connected in the hollow part in a penetrating way, and the capillary steel tube is positioned on one side of the hollow part and in the body; the oil pipe, the sleeve and the pump barrel are arranged in an oil well, the oil pipe is arranged in the sleeve, the lower end of the oil pipe is connected with the pump barrel, and the pressure transfer barrel is sleeved on the oil pipe and is positioned above the pump barrel; the nitrogen control device is arranged on the ground; the upper end of the composite cable penetrates through the wellhead of the oil well and is respectively connected with the nitrogen control device and the pressure sensor, and the composite cable is connected with the nitrogen control device through a capillary steel pipe; the lower end of the composite cable is connected to the pressure transmission cylinder through a capillary steel pipe; the control cabinet is arranged on the ground and is in electric signal connection with the pressure sensor through a cable; the control cabinet is in electrical signal connection with the pressure sensor and the nitrogen control device; the control cabinet is electrically connected with an automatic brake system of the oil pumping unit.
The control cabinet is connected with a well site RTU through an electric signal.
The capillary steel pipe is a hollow steel pipe, the minimum inner diameter is not more than 1mm, and the wall thickness of the capillary steel pipe is larger than the minimum inner diameter.
The capillary steel pipe is filled with nitrogen.
The volume of the pressure transmission cylinder is at least 20 times of that of the capillary steel pipe.
A capillary steel tube pressure measurement interval pumping control method comprises the following specific steps: firstly, sensing the bottom hole pressure through a pressure transmission cylinder, then transmitting the pressure to an oil well mouth through nitrogen in a capillary steel pipe, converting a pressure signal into a digital signal by a pressure sensor and transmitting the digital signal to a control cabinet, then determining the bottom hole pressure by using the pressure signal and the position of the pressure transmission cylinder, obtaining the submergence, formulating an oil well interval opening system, and judging the starting and stopping of an oil well; and finally, realizing automatic start and stop of the oil well through an automatic start and stop module of the oil pumping unit in the control cabinet, and synchronously controlling the oil pumping unit to loosen or tighten the brake through an automatic brake system of the oil pumping unit.
The method for obtaining the submergence and making the oil well interval open system comprises the following steps:
Pbottom＝PSleeve+PLiquid for treating urinary tract infection (1)
PLiquid for treating urinary tract infection＝ρghLiquid for treating urinary tract infection (2)
hSink with a metal plate＝HPump and method of operating the same-hLiquid for treating urinary tract infection (4)
Wherein: pBottom-well bottom pressure;
Psleeve-well casing pressure;
Pliquid for treating urinary tract infection-pressure generated by a liquid column above the well bore oil jacket ring overhead pressure transfer drum;
rho is the oil well produced fluid density;
hliquid for treating urinary tract infection-oil well working fluid level;
g is a constant coefficient, and 9.8N/kg is taken;
Hpump and method of operating the same-pump hang depth;
hsink with a metal plate-oil well submergence;
after the oil well submergence is obtained, a spacing period is formulated according to a set submergence threshold value and a fluid recovery time curve, and meanwhile, the starting and stopping of the oil well are judged according to whether the submergence threshold value is exceeded or not; and finally, the automatic start and stop of the oil well are realized through the capillary steel pipe pressure measurement intermittent pumping control device.
When the sinking degree of the oil well is greater than the threshold value, the oil well is not separated; executing interval opening when the oil well submergence is smaller than a threshold value; and recording the subsidence degree recovery time t, recording the last more than 6 subsidence degree recovery periods, and judging the oil well interval opening period according to the subsidence degree recovery periods.
The invention has the beneficial effects that:
the device realizes the collection of bottom hole pressure, and the collected pressure is uploaded to a wellhead, the bottom hole pressure is converted into the submergence degree, and an intermittent pumping system is established. The invention transmits the acquired signal to the well site RTU, and realizes the automatic intelligent separation of the oil well.
The invention can automatically adjust the intermittent opening period in real time according to the change conditions of the submergence degree and the bottom hole pressure, realize more accurate intermittent opening start-stop control and improve the efficiency of the oil production well system to the maximum extent.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is an overall schematic view of a capillary steel tube pressure measurement pumping control device.
FIG. 2 is a signal flow diagram of the present invention.
Fig. 3 is a cross-sectional view of a composite cable.
In the figures, the reference numbers are: 1. a composite cable; 101. a body; 102. a hollow portion; 103. a capillary steel pipe; 2. a wellhead of the oil well; 3. an oil pipe; 4. a sleeve; 5. a pressure transmission cylinder; 6. a pump barrel; 7. artificial well bottom; 8. a pressure sensor; 9. a control cabinet; 10. a nitrogen control device; 11. a cable; 12. automatic braking system of oil pumping unit.
Detailed Description
Example 1:
in order to overcome the problems, the invention provides a device and a method for controlling the pressure measurement of the capillary steel pipe of the oil well to be pumped between intervals, which are shown in the figures 1-3. The device can transmit the collected signals to the well site RTU and the upper computer, can realize the real-time remote control of a single well, and realizes the automatic intelligent separation of the oil well.
A capillary steel pipe pressure measurement interval pumping control device comprises a composite cable 1, a pressure sensor 8, an oil pipe 3, a sleeve 4, a pump cylinder 6, a control cabinet 9 and a nitrogen control device 10; the composite cable 1 comprises a body 101 and a capillary steel tube 103, wherein a hollow part 103 is arranged in the body 101, a cable and a signal wire are connected in the hollow part 103 in a penetrating way, and the capillary steel tube 103 is positioned on one side of the hollow part 103 and in the body 101; the oil pipe 3, the sleeve 4 and the pump barrel 6 are arranged in an oil well, the oil pipe 3 is arranged in the sleeve 4, the lower end of the oil pipe 3 is connected with the pump barrel 6, and the pressure transfer barrel 5 is sleeved on the oil pipe 3 and is positioned above the pump barrel 6; the nitrogen control device 10 is arranged on the ground; the upper end of the composite cable 1 penetrates through the oil well mouth 2 to be respectively connected with the nitrogen control device 10 and the pressure sensor 8, and the composite cable 1 is connected with the nitrogen control device 10 through the capillary steel pipe 103; the lower end of the composite cable 1 is connected to the pressure transmission cylinder 5 through the capillary steel pipe 103; the control cabinet 9 is arranged on the ground, and the control cabinet 9 is in electric signal connection with the pressure sensor 8 through a cable 11; the control cabinet 9 is in electric signal connection with the pressure sensor 8 and the nitrogen control device 10; the control cabinet 8 is electrically connected with an automatic brake system 12 of the oil pumping unit.
The control cabinet 9 at least comprises an analysis processing module, a data storage module, a data communication module, an oil pumping unit start-stop control module and a power supply; the analysis processing module is respectively in electric signal connection with the data storage module, the data communication module and the pumping unit start-stop control module; the data communication module is respectively in electric signal connection with the pressure sensor 8 and the nitrogen control device 10; the power supply is connected to a cable 11.
When in actual use, the control cabinet 9 can not only process and transmit the acquired data and provide kinetic energy for the equipment, but also judge the starting and stopping of the oil well and link with the automatic brake module of the oil pumping unit in the automatic brake system of the oil pumping unit to control the starting and stopping of the oil pumping unit.
As shown in fig. 1 and 3, the specific working process of the present invention is as follows: the pump barrel 6 is located above the artificial well bottom 7. After the capillary steel pipe pressure measuring intermittent pumping control device starts working, the capillary steel pipe pressure measuring intermittent pumping control device senses the bottom hole pressure through the pressure transmission cylinder 5, then transmits the pressure to the wellhead 2 through the nitrogen in the capillary steel pipe 1, a pressure sensor 8 arranged near the wellhead of an oil well converts a pressure signal into a digital signal, then a processor in a control cabinet 9 calculates the bottom hole liquid column pressure through the received pressure signal and the position parameter of the pressure transmission cylinder, the sinking degree is obtained, an oil well intermittent opening system can be formulated by utilizing the sinking degree, and the starting and stopping of the oil well are judged. And finally, the automatic starting and stopping of the oil well is realized through an automatic starting and stopping module of the oil pumping unit in the control cabinet 9, and the automatic braking module of the oil pumping unit synchronously controls the oil pumping unit to loosen or tighten the brake. As shown in fig. 2, in each link, the control cabinet 9 stores information of the submergence degree, the intermittent opening degree, the starting and stopping states of the pumping unit and the braking state in real time through the data communication storage module, and transmits the submergence degree, the intermittent opening degree, the starting and stopping states of the pumping unit, the braking state, the automatic starting and stopping execution condition of the pumping unit and the braking execution condition of the pumping unit to the well site RTU through the communication module, and the well site RTU transmits corresponding information to a corresponding control system, so that remote monitoring management is realized, remote control and decision making of operators and managers are facilitated, and meanwhile, the device can keep nitrogen balance through the nitrogen control device.
In the invention, the control cabinet 9 and the automatic brake system 12 of the oil pumping unit are both in the prior art, and further description is not provided in the invention. In the invention, the automatic braking system 12 of the oil pumping unit is arranged on the ground. The nitrogen control device 10 in the invention adopts the prior art and at least comprises a nitrogen source, a booster pump, an air compressor, a safe purging system and a data acquisition control system; wherein the safety purge system comprises: a check valve, a high pressure needle valve; the data acquisition control system also comprises a relay, an electromagnetic valve and a data acquisition processing unit; the nitrogen source is connected with the booster pump through a pipeline and is connected with the safe purging system through the data acquisition control system, and the start and stop of the booster pump and the opening of a valve of the purging system can be controlled through the data acquisition control system.
The working principle and the process of the nitrogen control device 10 are as follows: firstly, the nitrogen control device 10 performs first purging to enable nitrogen to fill the capillary steel tube 103 and the pressure transmission cylinder 5, whether the nitrogen is filled is judged by comparing the relationship between the volume of the purged nitrogen and the sum of the volumes of the capillary steel tube 103 and the pressure transmission cylinder 5, the pressure of the nitrogen is greater than the measured bottom hole pressure in production, then the nitrogen control device 10 stabilizes the pressure purging for more than 1 minute, and then the nitrogen control device 10 is closed. Because the trompil of 5 bottom ends of pressure transfer section of thick bamboo communicates with the pit shaft annular space, and the volume of pressure transfer section of thick bamboo 5 is tens times of capillary steel pipe volume, so after liquid gets into pressure transfer section of thick bamboo 5 under the effect of bottom pressure in the pit shaft, can extrude nitrogen gas, partial nitrogen gas in the pressure transfer section of thick bamboo 5 is extruded and is gone into behind capillary steel pipe 103, pressure increases, can slowly reach equilibrium with the pressure that liquid produced, and because the volume of pressure transfer section of thick bamboo 5 is very much than capillary steel pipe 103 volume, under the ordinary situation, liquid can not get into in the capillary steel pipe 103, like this, can calculate through gathering the pressure of ground capillary pipe 1 and obtain the approximate pressure in the oil-well pump top in the pit. The pressure transmission cylinder 5 can dynamically ensure the basic stability of the depth of the gas-liquid two-phase interface in the pressure transmission cylinder 5, so that the gas-liquid two-phase interface cannot invade into the capillary steel tube 103. The control cabinet 9 can process and transmit the acquired data and provide kinetic energy for the equipment.
The invention can acquire the oil well submergence and underground pressure values in real time and provide data support for the decision of managers. The intermittent opening period is automatically adjusted in real time according to the submergence degree and the change condition of the bottom hole pressure, more accurate intermittent opening start-stop control is realized, and the efficiency of the oil production well system is improved to the maximum extent. The device can transmit the collected signals to a well site RTU to realize the automatic intelligent spacing of the oil well. The invention can transmit data to the upper computer and then carry out various remote controls. And the real-time remote control of a single well is realized through the upper computer.
Example 2:
based on embodiment 1, in this embodiment, preferably, the control cabinet 9 is electrically connected to a wellsite RTU.
The well site RTU of the invention adopts the prior art, and can be used as long as the RTU product can realize the functions.
Preferably, the capillary steel pipe 103 is a hollow steel pipe, the minimum inner diameter is not more than 1mm, and the wall thickness of the capillary steel pipe 103 is greater than the minimum inner diameter.
The thickness of the capillary steel tube 103 in the present invention is 5mm, and it is required to maintain appropriate flexibility and ductility without breaking or cracking due to bending.
Preferably, the capillary steel pipe 103 is filled with nitrogen gas.
Preferably, the volume of the pressure transfer cylinder 5 is at least 20 times of the volume of the capillary steel pipe 1.
In the invention, the pressure transmission cylinder 5 is arranged above the oil well pump 6, the downhole pressure acts on the pressure transmission cylinder 5, and then the pressure is transmitted to the ground wellhead through the nitrogen in the capillary steel pipe 103.
A capillary steel tube pressure measurement interval pumping control method comprises the following specific steps: firstly, sensing the bottom hole pressure through a pressure transmission cylinder 5, then transmitting the pressure to an oil well wellhead 2 through nitrogen in a capillary steel pipe 103, converting a pressure signal into a digital signal by a pressure sensor 8, transmitting the digital signal to a control cabinet 9, then determining the bottom hole pressure by using the pressure signal and the position of the pressure transmission cylinder 5, obtaining the submergence, formulating an oil well interval opening system, and judging the start and stop of an oil well; and finally, the automatic starting and stopping of the oil well is realized through an automatic starting and stopping module of the oil pumping unit in the control cabinet 9, and the automatic braking system 12 of the oil pumping unit synchronously controls the oil pumping unit to loosen or tighten the brake.
The method for obtaining the submergence and making the oil well interval open system comprises the following steps:
Pbottom＝PSleeve+PLiquid for treating urinary tract infection (1)
PLiquid for treating urinary tract infection＝ρghLiquid for treating urinary tract infection (2)
hSink with a metal plate＝HPump and method of operating the same-hLiquid for treating urinary tract infection (4)
Wherein: pBottom-well bottom pressure;
Psleeve-well casing pressure;
Pliquid for treating urinary tract infection-pressure generated by a liquid column above the well bore oil jacket ring overhead pressure transfer drum;
rho is the oil well produced fluid density;
hliquid for treating urinary tract infection-oil well working fluid level;
g is a constant coefficient, and 9.8N/kg is taken;
Hpump and method of operating the same-pump hang depth;
hsink with a metal plate-oil well submergence;
after the oil well submergence is obtained, a spacing period is formulated according to a set submergence threshold value and a fluid recovery time curve, and meanwhile, the starting and stopping of the oil well are judged according to whether the submergence threshold value is exceeded or not; and finally, the automatic start and stop of the oil well are realized through the capillary steel pipe pressure measurement intermittent pumping control device.
When the sinking degree of the oil well is greater than the threshold value, the oil well is not separated; executing interval opening when the oil well submergence is smaller than a threshold value; and recording the subsidence degree recovery time t, recording the last more than 6 subsidence degree recovery periods, and judging the oil well interval opening period according to the subsidence degree recovery periods. The data can be transmitted back to the upper computer in real time.
The invention can acquire the oil well submergence and underground pressure values in real time and provide data support for the decision of managers. The invention automatically adjusts the intermittent opening period in real time according to the change conditions of the submergence degree and the bottom hole pressure, realizes more accurate intermittent opening start-stop control, and improves the efficiency of the oil production well system to the maximum extent. The device can transmit the collected signals to the well site RTU and the upper computer, the upper computer can directly send out a control command, real-time remote control of a single well can be realized, and automatic intelligent separation of an oil well is realized. According to the invention, the automatic starting and stopping module of the pumping unit can realize the automatic starting and stopping of the pumping unit, the well site is unattended, the labor intensity of field personnel is greatly reduced, and the working efficiency of the personnel is improved.
The invention is mainly technically characterized in that the single-well submergence degree is measured and calculated by adopting a capillary steel pipe, the open period is calculated by utilizing the submergence degree and a fluid recovery curve, an open system is formulated, and the intelligent start-stop control of the pumping unit is realized by a start-stop control module. The device provided by the invention can monitor the submergence in real time, can adjust the intermittent pumping system in real time, automatically control the pumping unit, can be widely used for oil wells in oil fields, is suitable for beam pumping units, and has a relatively wide application prospect. The device has no wearing parts and high reliability, does not emit sound waves, does not adopt sleeve gas, and is relatively safe and reliable.
The automatic start and stop of the pumping unit is realized by an automatic start and stop module of the pumping unit, the automatic start and stop module of the pumping unit is divided into two parts, wherein one part is a start and stop control module of the pumping unit in a control cabinet 9 and is used for controlling the pumping unit; the other part of the system consists of an automatic brake module of the pumping unit in an automatic brake system 12 of the pumping unit, and the automatic brake module of the pumping unit synchronously controls the brake to be loosened or tightened according to start and stop signals so as to realize the well stop guarantee of the oil well. According to the invention, the automatic starting and stopping module of the pumping unit can realize the automatic starting and stopping of the pumping unit, the well site is unattended, the labor intensity of field personnel is greatly reduced, and the working efficiency of the personnel is improved.
The invention realizes the bottom pressure collection through the device, and transmits the collected pressure to the wellhead, then utilizes the intelligent intermittent module of the device to convert the bottom pressure into the submergence degree, and makes the intermittent pumping system, and finally realizes the automatic start-stop, brake and the like of the pumping unit through the automatic control module of the device. Therefore, the device can finally realize scientific formulation of the oil well open system and automatic start and stop of the pumping unit.
The invention uses the capillary rigid pipe 103 filled with nitrogen to transmit the liquid pressure at the bottom of the well to the ground through gas, and the liquid pressure is converted into digital quantity at the ground through the pressure sensor 8 so as to sense the underground liquid pressure, and further calculate the sinking degree and the oil well spacing degree. The device can monitor the submergence degree in real time, is favorable for fully knowing the production condition of the oil well, forms a scientific oil well spacing system, and adjusts the spacing time in time and automatically according to the liquid filling condition. The device can also realize the automatic start and stop of the pumping unit according to an intermittent opening system. The intelligent control oil pumping unit disclosed by the invention can be used for intelligently controlling the automatic start and stop of the oil pumping unit, realizing more scientific and more accurate oil well interval pumping, and improving the system efficiency to the maximum extent.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The structure of the apparatus and the steps thereof not described in detail in this embodiment belong to the common techniques and methods in the industry, and are not described herein.
Claims (8)
1. The utility model provides a control device is taken out between capillary steel pipe pressure measurement which characterized in that: the device comprises a composite cable (1), a pressure sensor (8), an oil pipe (3), a sleeve (4), a pump cylinder (6), a control cabinet (9) and a nitrogen control device (10); the composite cable (1) comprises a body (101) and a capillary steel tube (102), wherein a hollow part (103) is arranged in the body (101), a cable and a signal wire are connected in the hollow part (103) in a penetrating manner, and the capillary steel tube (102) is positioned on one side of the hollow part (103) and positioned in the body (101); the oil pipe (3), the sleeve (4) and the pump barrel (6) are arranged in an oil well, the oil pipe (3) is arranged in the sleeve (4), the lower end of the oil pipe (3) is connected with the pump barrel (6), and the pressure transfer barrel (5) is sleeved on the oil pipe (3) and is positioned above the pump barrel (6); the nitrogen control device (10) is arranged on the ground; the upper end of the composite cable (1) penetrates through an oil well wellhead (2) and is respectively connected with a nitrogen control device (10) and a pressure sensor (8), and the composite cable (1) is connected with the nitrogen control device (10) through a capillary steel pipe (102); the lower end of the composite cable (1) is connected to the pressure transmission cylinder (5) through a capillary steel pipe (102); the control cabinet (9) is arranged on the ground, and the control cabinet (9) is in electric signal connection with the pressure sensor (8) through a cable (11); the control cabinet (9) is in electric signal connection with the pressure sensor (8) and the nitrogen control device (10); the control cabinet (9) is electrically connected with an automatic brake system (12) of the oil pumping unit.
2. The capillary steel tube pressure measurement interval pumping control device according to claim 1, characterized in that: and the control cabinet (9) is electrically connected with a well site RTU.
3. The capillary steel tube pressure measurement interval pumping control device according to claim 1, characterized in that: the capillary steel pipe (102) is a hollow steel pipe, the minimum inner diameter is not more than 1mm, and the wall thickness of the capillary steel pipe (103) is larger than the minimum inner diameter.
4. The capillary steel tube pressure measurement interval pumping control device according to claim 1, characterized in that: the capillary steel pipe (102) is filled with nitrogen.
5. The capillary steel tube pressure measurement interval pumping control device according to claim 1, characterized in that: the volume of the pressure transmission cylinder (5) is at least 20 times of that of the capillary steel pipe (1).
6. A capillary steel tube pressure measurement interval pumping control method is characterized in that: the method comprises the following specific steps: firstly, the bottom hole pressure is sensed through a pressure transmission cylinder (5), then the pressure is transmitted to an oil well mouth (2) through nitrogen in a capillary steel pipe (103), a pressure sensor (8) converts a pressure signal into a digital signal and transmits the digital signal to a control cabinet (9), then the bottom hole pressure is determined by utilizing the pressure signal and the position of the pressure transmission cylinder (5), the submergence degree is obtained, an oil well interval opening system is formulated, and the start and stop of an oil well are judged; and finally, the automatic starting and stopping of the oil well is realized through an automatic starting and stopping module of the oil pumping unit in the control cabinet (9), and the automatic braking system (12) of the oil pumping unit synchronously controls the oil pumping unit to loosen or tighten the brake.
7. The capillary steel tube pressure measurement interval pumping control method according to claim 6, characterized in that: the method for obtaining the submergence and making the oil well interval open system comprises the following steps:
Pbottom＝PSleeve+PLiquid for treating urinary tract infection (1)
PLiquid for treating urinary tract infection＝ρghLiquid for treating urinary tract infection (2)
hSink with a metal plate＝HPump and method of operating the same-hLiquid for treating urinary tract infection (4)
Wherein: pBottom-well bottom pressure;
Psleeve-well casing pressure;
Pliquid for treating urinary tract infection-pressure generated by a liquid column above the well bore oil jacket ring overhead pressure transfer drum;
rho is the oil well produced fluid density;
hliquid for treating urinary tract infection-oil well working fluid level;
g is a constant coefficient, and 9.8N/kg is taken;
Hpump and method of operating the same-pump hang depth;
hsink with a metal plate-oil well submergence;
after the oil well submergence is obtained, a spacing period is formulated according to a set submergence threshold value and a fluid recovery time curve, and meanwhile, the starting and stopping of the oil well are judged according to whether the submergence threshold value is exceeded or not; and finally, the automatic start and stop of the oil well are realized through the capillary steel pipe pressure measurement intermittent pumping control device.
8. The capillary steel tube pressure measurement interval pumping control method according to claim 7, characterized in that: when the sinking degree of the oil well is greater than the threshold value, the oil well is not separated; executing interval opening when the oil well submergence is smaller than a threshold value; and recording the subsidence degree recovery time t, recording the last more than 6 subsidence degree recovery periods, and judging the oil well interval opening period according to the subsidence degree recovery periods.
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