CN118208175A - Negative pressure blocking removing method for oil-water well - Google Patents
Negative pressure blocking removing method for oil-water well Download PDFInfo
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- CN118208175A CN118208175A CN202410487831.XA CN202410487831A CN118208175A CN 118208175 A CN118208175 A CN 118208175A CN 202410487831 A CN202410487831 A CN 202410487831A CN 118208175 A CN118208175 A CN 118208175A
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000003129 oil well Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000011010 flushing procedure Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 32
- 238000012544 monitoring process Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000010223 real-time analysis Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 9
- 239000003921 oil Substances 0.000 description 67
- 230000006378 damage Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 230000020477 pH reduction Effects 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000013043 chemical agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipeline Systems (AREA)
Abstract
The application provides a negative pressure blocking removing method for an oil-water well, which comprises the following steps: setting a packer F in the oil well casing A, wherein the packer F is used for dividing well control fluid in the oil well casing A into an upper part and a lower part; an oil pipe C with a jet-production combined pump D, a well flushing valve E, a negative pressure valve G, a screen pipe H and a plug I is arranged at the bottom in the oil sleeve A in sequence; the rod is thrown to open the negative pressure valve G, the oil pipe C is communicated with the annulus below the packer F, the oil layer B is released and sprayed out, and a higher negative pressure value is achieved, so that the pollution and blockage of the oil layer B in the near-wellbore zone are relieved. The negative pressure blocking removing method provided by the application can not only effectively remove the pollution of the near-wellbore area of the oil layer, recover and improve the permeability and furthest improve the oil gas circulation environment, but also can not produce secondary pollution, has a relatively short operation period, does not need large-scale equipment for assistance, and ensures lower operation cost.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a negative pressure blocking removing method for an oil-water well.
Background
In the whole process of oil and gas drilling, well completion, well workover, yield improvement and development and production, the phenomenon of reduced fluid output or injection capacity is called hydrocarbon reservoir damage. Hydrocarbon reservoir damage in the narrow sense, particularly hydrocarbon reservoir permeability decline, actually includes absolute permeability decline and relative permeability decline. Hydrocarbon reservoir damage is also a type of action or process, including physical, chemical, biological, and thermal action, and the corresponding type of damage is referred to as: physical damage, chemical damage, biological damage, and thermal damage, which are factors and modes that lead to decreased permeability of hydrocarbon reservoirs. Whatever the manner in which the damage is made, the end result is a drop in production from the production well, requiring additional means to restore the production or production from the well.
Therefore, how to remove the pollution and blockage of the oil layer, recover and improve the permeability of the near wellbore area of the oil layer, thereby having very important significance for increasing the yield of the oil and gas well, and the prior art carries out the blockage removal by chemical, physical, acidification or fracturing and other modes;
The chemical blocking removal needs to adopt special chemical agents, has strong selectivity to stratum, high cost and insignificant effect; the object understanding blocking needs to adopt special underground equipment, has strong selectivity to blocking types, high cost and insignificant effect; the acidification needs a special acid liquor system, a special formula and a plurality of medicaments, has strong selectivity to the blocking type, has high cost, can cause secondary pollution of an oil layer, and needs various large-scale special vehicles and equipment for acidification construction, and has high operation cost and long period; the fracturing requires special fracturing fluid, propping agent and a plurality of medicaments, and the construction requires more large-scale special vehicles and equipment, so that the operation cost is highest and the period is longer.
For example: chinese invention patent: CN108804779B, disclosed is a heavy oil reservoir blocking removal process simulation method based on a digital core model, the specification of which discloses: finally, analyzing microstructure and pore permeability change of the digital core model before and after the chemical plugging agent is plugged to obtain plugging removal effects of different types of chemical agent reservoirs; the above patent can be used to demonstrate the drawbacks of the prior art.
Therefore, the negative pressure blocking removing method for the oil-water well is improved.
Disclosure of Invention
The invention aims at: the method aims at solving the problems of high blocking removal cost, pollution and long period of the prior art by means of chemical, physical, acidification or fracturing and the like.
In order to achieve the aim of the invention, the invention provides a negative pressure blocking removing method for an oil-water well, so as to solve the problems.
The application is specifically as follows:
A negative pressure blocking removing method for an oil-water well comprises the following steps:
setting a packer F in the oil well casing A, wherein the packer F is used for dividing well control fluid in the oil well casing A into an upper part and a lower part;
an oil pipe C with a jet-production combined pump D, a well flushing valve E, a negative pressure valve G, a screen pipe H and a plug I is arranged at the bottom in the oil sleeve A in sequence;
The rod is thrown to open the negative pressure valve G, the oil pipe C is communicated with the annulus below the packer F, the oil layer B is released and sprayed out, and a higher negative pressure value is achieved, so that the pollution and blockage of the oil layer B in the near-wellbore zone are relieved.
As the preferable technical scheme of the application, the negative pressure valve G is used for isolating the well control liquid in the oil pipe C, so that no liquid exists in the oil pipe C above the negative pressure valve G or the liquid height is controlled according to the requirement, and the negative pressure valve G is used for releasing the pressure of the oil layer B.
As the preferable technical scheme of the application, the clear water is filled into the oil pipe C, and the height of the liquid column in the oil pipe C above the negative pressure valve G is adjusted so as to adjust the unblocking negative pressure value;
Before the unblocking operation starts, a water pump is connected to the oil pipe C, and enough clean water is poured to form a liquid column, so that the height of the liquid column is ensured to be enough to cover the position of the negative pressure valve G; the liquid column height is adjusted by controlling the opening of the negative pressure valve G so as to adjust the negative pressure value in the oil pipe C.
Compared with the prior art, the invention has the beneficial effects that:
In the scheme of the application:
the negative pressure blocking removing method provided by the invention can not only effectively remove the pollution of the near-wellbore area of the oil layer, recover and improve the permeability and furthest improve the oil gas circulation environment, but also can not produce secondary pollution, has a relatively short operation period, does not need large-scale equipment for assistance, and ensures lower operation cost.
Drawings
FIG. 1 is a schematic illustration of an oil well casing provided by the present application;
FIG. 2 is a schematic cross-sectional view of an oil well casing provided by the present application;
FIG. 3 is a schematic illustration of a packer provided by the present application;
Fig. 4 is a schematic diagram of an oil pipe provided by the application.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As described in the background art, the prior art performs blocking removal by chemical, physical, acidification or fracturing methods; the chemical blocking removal needs to adopt special chemical agents, has strong selectivity to stratum, high cost and insignificant effect; the object understanding blocking needs to adopt special underground equipment, has strong selectivity to blocking types, high cost and insignificant effect; the acidification needs a special acid liquor system, a special formula and a plurality of medicaments, has strong selectivity to the blocking type, has high cost, can cause secondary pollution of an oil layer, and needs various large-scale special vehicles and equipment for acidification construction, and has high operation cost and long period; the fracturing requires special fracturing fluid, propping agent and a plurality of medicaments, and the construction requires more large-scale special vehicles and equipment, so that the operation cost is highest and the period is longer.
In order to solve the technical problem, the invention provides a negative pressure blocking removing method for an oil-water well, which is applied to blocking removing of the oil-water well.
Specifically, referring to fig. 1 to 4, the negative pressure blocking removing method for the oil-water well specifically includes:
setting a packer F in the oil well casing A, wherein the packer F is used for dividing well control fluid in the oil well casing A into an upper part and a lower part;
an oil pipe C with a jet-production combined pump D, a well flushing valve E, a negative pressure valve G, a screen pipe H and a plug I is arranged at the bottom in the oil sleeve A in sequence;
The rod is thrown to open the negative pressure valve G, the oil pipe C is communicated with the annulus below the packer F, the oil layer B is released and sprayed out, and a higher negative pressure value is achieved, so that the pollution and blockage of the oil layer B in the near-wellbore zone are relieved.
The negative pressure blocking removing method provided by the invention can not only effectively remove the pollution of the near-wellbore area of the oil layer, recover and improve the permeability and furthest improve the oil gas circulation environment, but also can not produce secondary pollution, has a relatively short operation period, does not need large-scale equipment for assistance, and ensures lower operation cost.
In order to make the person skilled in the art better understand the solution of the present invention, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Example 1
Referring to fig. 1-4, a negative pressure blocking removing method for an oil-water well includes:
setting a packer F in the oil well casing A, wherein the packer F is used for dividing well control fluid in the oil well casing A into an upper part and a lower part;
an oil pipe C with a jet-production combined pump D, a well flushing valve E, a negative pressure valve G, a screen pipe H and a plug I is arranged at the bottom in the oil sleeve A in sequence;
The rod is thrown to open the negative pressure valve G, the oil pipe C is communicated with the annulus below the packer F, the oil layer B is released and sprayed out, and a higher negative pressure value is achieved, so that the pollution and blockage of the oil layer B in the near-wellbore zone are relieved.
Further, the negative pressure valve G is used for isolating the well control fluid in the oil pipe C, so that no fluid or the height of the fluid is controlled according to the requirement in the oil pipe C above the negative pressure valve G, and the negative pressure valve G is used for releasing the pressure of the oil layer B.
Further, filling clear water into the oil pipe C, and adjusting the height of the liquid column in the oil pipe C above the negative pressure valve G to adjust the unblocking negative pressure value;
Before the unblocking operation starts, a water pump is connected to the oil pipe C, and enough clean water is poured to form a liquid column, so that the height of the liquid column is ensured to be enough to cover the position of the negative pressure valve G; the liquid column height is adjusted by controlling the opening of the negative pressure valve G so as to adjust the negative pressure value in the oil pipe C.
The negative pressure value required by the negative pressure unblocking can be set at will, when the rod is thrown to open the negative pressure valve G, the annular space below the packer F is communicated with the oil pipe C, and the negative pressure applied to the oil layer B is equal to the pressure of the liquid column in the oil pipe C, namely the set negative pressure, so that the required negative pressure value can be obtained by adjusting the liquid column in the oil pipe C.
Determining a unblocking negative pressure value as shown in the following table:
Example 2
The method for removing the blockage of the oil-water well under negative pressure provided in the embodiment 1 is further optimized, specifically, a pressure sensor is further installed at the bottom of the oil pipe C and used for monitoring the pressure condition of the oil layer B so as to adjust the negative pressure value and the height of the liquid column, so that the blockage removing efficiency is improved to the greatest extent;
the operation method comprises the following steps: the bottom of the oil pipe C is provided with a pressure sensor which is directly contacted with the oil layer B to measure the pressure of the oil layer B;
After the blocking removal operation is started, the pressure sensor continuously transmits the pressure data of the oil layer B to the control center, wherein the pressure data of the oil layer B is collected by the pressure sensor;
An operator observes the data provided by the pressure sensor at the control center to know the state of the oil layer B;
the pressure of the oil layer B drops, indicating that a blockage still exists, and increasing the negative pressure value at the moment to increase the suction force;
the pressure of the oil layer B continuously fluctuates, and the height of the liquid column in the oil pipe C is adjusted to maintain the unblocking condition.
By the specific method, the oil well blocking removal operation can be more accurately subjected to parameter adjustment aiming at the actual condition of the oil layer B, so that the blocking removal efficiency is improved to the greatest extent, blocking objects are ensured to be successfully broken or removed, and the real-time monitoring and adjusting process is beneficial to improving the intelligence and success rate of the blocking removal operation.
Further, a safety valve is further arranged at the upper part of the oil well casing A and used for releasing pressure so as to ensure the safety of oil well operation, and the release pressure of the safety valve can be adjusted according to specific conditions so as to prevent potential dangerous conditions.
The safety valve is arranged at the upper part of the oil well casing A and is connected with the pressure sensor and the control center to monitor the pressure condition of the oil well;
The relief pressure threshold of the relief valve is set by an adjusting device on the valve, and the relief valve automatically opens the relief pressure when the pressure value exceeds the relief pressure threshold.
Further, a temperature sensor is installed in the oil pipe C and used for monitoring the temperature change of the oil layer B, and the temperature data can help operators to better know the condition of the oil layer and correspondingly adjust according to the requirement so as to optimize the blocking removal process.
After the blocking removal operation is started, monitoring temperature data of the oil layer B collected by a temperature sensor in real time, and transmitting the temperature data to a control center;
an operator observes temperature data provided by a temperature sensor at a control center to know the state of the oil layer B;
The temperature data may provide information about fluid dynamics of the reservoir, changes in conditions, and possible problems.
If the temperature rises, it means that the fluid in the oil layer B is actively being moved during the deblocking operation, and at this time, the negative pressure value and the liquid column height are adjusted according to the magnitude of the temperature rise to ensure the stability of the deblocking operation.
If the temperature drops, indicating that the obstruction is impeding the movement of the fluid, the operator increases the negative pressure to enhance the suction force according to the trend of temperature drop.
By monitoring the temperature change of the oil layer B and adjusting the operation parameters according to the temperature data, the condition of the oil layer can be better known, the blocking removal process is optimized, and the real-time temperature monitoring and adjusting process is beneficial to improving the intelligence and success rate of the blocking removal operation.
Further, the screen pipe H and the plug I are detachably designed to be selected according to the particle size and the characteristics of the oil layer B, and the screen pipe H can be effectively prevented from being blocked by particles through different screen pore structures, so that the service life of equipment is prolonged, and the maintenance cost is reduced;
And the plug I is convenient to replace when needed, the plug removal effect is prevented from being influenced by abrasion or damage of the plug, and the design is also beneficial to reducing the maintenance time and the cost.
Further, in the process of the deblocking operation, the negative pressure value in the oil pipe C is adjusted in real time by monitoring the pressure change of the negative pressure valve G, so that the feedback mechanism can ensure that the optimal negative pressure condition is always maintained in the deblocking process, thereby achieving a higher deblocking effect.
Example 3
The method for negative pressure blocking removal of the oil-water well provided in embodiment 1 or 2 is further optimized, specifically, pretreatment is performed before blocking removal operation, and the steps include:
Before the unblocking operation begins, a cleaning liquid is injected into the interior of the well, which will help flush and clear portions of the plugs, reducing obstructions during subsequent unblocking.
Stopping injection and waiting for a period of time after the cleaning liquid is injected for a period of time, so that the cleaning liquid plays a role in the oil well;
Finally, the cleaning liquid and loose plugs injected before are discharged out of the oil well by pumping clear water, so that smoothness of fluid in the plug removal operation is ensured.
Through carrying out the washing step of preliminary treatment, the unblock operation can be carried out under relatively clean environment, reduces the interference of jam, improves the accuracy and the effect of unblock operation, and this preliminary treatment step helps optimizing whole unblock process, ensures that negative pressure and fluid can act on the jam position more effectively.
Further, the real-time vibration monitoring is performed in the blocking removal process, and the steps include:
Before the blocking removal operation starts, a vibration sensor is installed in the oil well casing A; a vibration sensor is a device for measuring, detecting and monitoring vibrations, shocks and movements of an object or system. The vibration sensor can be used for monitoring the vibration condition near the negative pressure valve G so as to reflect the state and the negative pressure change of the negative pressure valve G and help to adjust the negative pressure value in real time so as to achieve the optimal blocking removal effect;
After the blocking removal operation is started, the vibration sensor continuously collects vibration signals in the oil well casing A and transmits data to the control center for real-time analysis;
an analyst judges the effect of the blockage removing operation according to the change of the vibration signal, and when the vibration amplitude is gradually reduced, the blockage is broken or the fluid starts to pass through;
According to the trend and change of the vibration data, an operator adjusts the negative pressure value and the liquid column height.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It is apparent that the above-described embodiments are only some embodiments of the present invention, but not all embodiments, and the preferred embodiments of the present invention are shown in the drawings, which do not limit the scope of the patent claims. This invention may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the invention are directly or indirectly applied to other related technical fields, and are also within the scope of the invention.
Claims (10)
1. The negative pressure blocking removing method for the oil-water well is characterized by comprising the following steps of:
setting a packer F in the oil well casing A, wherein the packer F is used for dividing well control fluid in the oil well casing A into an upper part and a lower part;
an oil pipe C with a jet-production combined pump D, a well flushing valve E, a negative pressure valve G, a screen pipe H and a plug I is arranged at the bottom in the oil sleeve A in sequence;
The rod is thrown to open the negative pressure valve G, the oil pipe C is communicated with the annulus below the packer F, the oil layer B is released and sprayed out, and a higher negative pressure value is achieved, so that the pollution and blockage of the oil layer B in the near-wellbore zone are relieved.
2. The negative pressure unblocking method for an oil-water well according to claim 1, wherein the negative pressure valve G is used for isolating well control fluid in the oil pipe C, so that no fluid is present in the oil pipe C above the negative pressure valve G or the height of the fluid is controlled according to the need, and the negative pressure valve G is used for releasing the pressure of the oil layer B.
3. The negative pressure unblocking method for the oil-water well according to claim 2, wherein clear water is filled into the oil pipe C, and the height of a liquid column in the oil pipe C above the negative pressure valve G is adjusted to adjust the unblocking negative pressure value;
Before the unblocking operation starts, a water pump is connected to the oil pipe C, and enough clean water is poured to form a liquid column, so that the height of the liquid column is ensured to be enough to cover the position of the negative pressure valve G; the liquid column height is adjusted by controlling the opening of the negative pressure valve G so as to adjust the negative pressure value in the oil pipe C.
4. The negative pressure unblocking method for an oil-water well according to claim 1, wherein the bottom of the oil pipe C is further provided with a pressure sensor for monitoring the pressure condition of the oil layer B to adjust the negative pressure value and the liquid column height;
the operation method comprises the following steps: the bottom of the oil pipe C is provided with a pressure sensor which is directly contacted with the oil layer B to measure the pressure of the oil layer B;
After the blocking removal operation is started, the pressure sensor continuously transmits the pressure data of the oil layer B to the control center, wherein the pressure data of the oil layer B is collected by the pressure sensor;
An operator observes the data provided by the pressure sensor at the control center to know the state of the oil layer B;
the pressure of the oil layer B drops, indicating that a blockage still exists, and increasing the negative pressure value at the moment to increase the suction force;
the pressure of the oil layer B continuously fluctuates, and the height of the liquid column in the oil pipe C is adjusted to maintain the unblocking condition.
5. The negative pressure unblocking method for an oil-water well according to claim 1, wherein a safety valve is further arranged at the upper part of the oil well casing A for releasing pressure;
the safety valve is arranged at the upper part of the oil well casing A and is connected with the pressure sensor and the control center to monitor the pressure condition of the oil well;
The relief pressure threshold of the relief valve is set by an adjusting device on the valve, and the relief valve automatically opens the relief pressure when the pressure value exceeds the relief pressure threshold.
6. The negative pressure blocking removing method for the oil-water well according to claim 1, wherein a temperature sensor is arranged in the oil pipe C and used for monitoring the temperature change of the oil layer B;
After the blocking removal operation is started, monitoring temperature data of the oil layer B collected by a temperature sensor in real time, and transmitting the temperature data to a control center;
an operator observes temperature data provided by a temperature sensor at a control center to know the state of the oil layer B;
A temperature rise, which indicates that the fluid in the reservoir B is being actively moved during the deblocking operation, at which time the negative pressure value and the liquid column height are adjusted according to the magnitude of the temperature rise;
The temperature drop indicates that the obstruction is impeding the movement of the fluid, and the operator increases the negative pressure to enhance suction according to the trend of the temperature drop.
7. The method for negative pressure unblocking of an oil-water well according to claim 1, wherein the screen pipe H and the plug I are detachably designed to be selected according to the particle size and characteristics of the oil layer B.
8. The negative pressure unblocking method for the oil-water well according to claim 1, wherein the negative pressure value in the oil pipe C is adjusted in real time by monitoring the pressure change of the negative pressure valve G during the unblocking operation.
9. The negative pressure unblocking method for an oil-water well according to claim 1, wherein the step of pretreating before the unblocking operation comprises the steps of:
before the blocking removal operation starts, injecting the cleaning liquid into the oil well, stopping injection after the cleaning liquid is injected for a period of time, and waiting for a period of time to enable the cleaning liquid to play a role in the oil well;
finally, the previously injected cleaning fluid and loose plugs are discharged from the well by pumping clean water.
10. The negative pressure unblocking method for an oil-water well according to claim 1, wherein the real-time vibration monitoring is performed during the unblocking process, the steps comprising:
Before the blocking removal operation starts, a vibration sensor is installed in the oil well casing A;
After the blocking removal operation is started, the vibration sensor continuously collects vibration signals in the oil well casing A and transmits data to the control center for real-time analysis;
an analyst judges the effect of the blockage removing operation according to the change of the vibration signal, and when the vibration amplitude is gradually reduced, the blockage is broken or the fluid starts to pass through;
According to the trend and change of the vibration data, an operator adjusts the negative pressure value and the liquid column height.
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CN202410487831.XA CN118208175A (en) | 2024-04-23 | 2024-04-23 | Negative pressure blocking removing method for oil-water well |
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CN202410487831.XA CN118208175A (en) | 2024-04-23 | 2024-04-23 | Negative pressure blocking removing method for oil-water well |
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