CN106917613B - Oilfield liquid carbon dioxide injection device and injection method - Google Patents
Oilfield liquid carbon dioxide injection device and injection method Download PDFInfo
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- CN106917613B CN106917613B CN201710270223.3A CN201710270223A CN106917613B CN 106917613 B CN106917613 B CN 106917613B CN 201710270223 A CN201710270223 A CN 201710270223A CN 106917613 B CN106917613 B CN 106917613B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 344
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 171
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 165
- 239000007788 liquid Substances 0.000 title claims abstract description 164
- 238000002347 injection Methods 0.000 title claims abstract description 89
- 239000007924 injection Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 26
- 241000191291 Abies alba Species 0.000 claims abstract description 26
- 238000010992 reflux Methods 0.000 claims description 15
- 239000003129 oil well Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 8
- 238000013022 venting Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 15
- 239000002184 metal Substances 0.000 description 12
- 235000011089 carbon dioxide Nutrition 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 208000001034 Frostbite Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
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Abstract
The invention discloses an oilfield liquid carbon dioxide injection device and an oilfield liquid carbon dioxide injection method, belonging to oilfield exploitationTechnical field. The injection device includes: CO 2 Tank car, said CO 2 The tank truck is provided with a shielding pump; a liquid inlet pipeline is arranged on the bottom of the liquid inlet pipeline, the liquid inlet pipeline is connected with the shielding pump to form a liquid supply pipeline; the inlet of the carbon dioxide plunger pump is connected with the other end of the liquid inlet pipeline; the variable frequency motor is connected with the carbon dioxide plunger pump; the controller is connected with the variable frequency motor; one end of the liquid squeezing pipeline is connected with the outlet of the carbon dioxide plunger pump, and the other end of the liquid squeezing pipeline is connected with the Christmas tree; the liquid squeezing pipeline is provided with a safety valve, an electric contact pressure gauge, an outlet pressure transmitter, a vent valve and a pump outlet valve; the electric contact pressure gauge and the outlet pressure transmitter are respectively connected with the controller; the electric contact pressure gauge, the outlet pressure transmitter, the controller and the safety valve form multiple linkage protection together, and the safety performance is high.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to an oilfield liquid carbon dioxide injection device and an oilfield liquid carbon dioxide injection method.
Background
CO 2 The oil displacement is an important means in the tertiary oil recovery technology of the oil field gas injection, and the technology is suitable for conventional oil reservoirs, particularly low permeability and ultra-low permeability oil reservoirs, can obviously improve the recovery ratio of crude oil and meets the requirements of oil field development. In addition, the problem of sealing carbon dioxide can be solved, and the atmosphere environment is protected. Under the background of energy shortage, energy conservation and emission reduction, the technology has very wide popularization prospect. At present, china already hasIs beginning to aim at CO injection in oil fields 2 Development and application of tertiary oil recovery technology. To improve storage and transport efficiency, liquid CO is reduced 2 High cost of injection after gasification, low temperature liquid CO is often injected in site operation 2 。
Research on carbon dioxide oil displacement technology has been carried out for a long time in China, such as victory oil fields, daqing oil fields, jiangsu oil fields and the like, and the injection device and the process flow used are mostly simpler and have single functions. Mainly comprises a tank car, a corrugated hose, a generator and CO 2 The device comprises a plunger pump, a safety valve, a pressure gauge, a vent valve, a high-pressure pipeline and the like. Corrugated hose directly and CO 2 The plunger pump is connected with the low-pressure inlet end, and liquid carbon dioxide is conveyed to CO through a shielding pump of the tank car 2 The pump cavity of the plunger pump drives CO through the motor 2 And the plunger pump pressurizes and extrudes the liquid carbon dioxide into the oil well.
In the construction process, the highest injection pressure is controlled by a safety valve, and the safety valve is used for tripping and releasing pressure when the pressure is over-pressure so as to ensure the safety of personnel, equipment and oil wells. The prolonged injection may cause failure of the internal seal of the safety valve due to the cryogenic medium of carbon dioxide. If the injection pressure exceeds the highest design pressure, the injection pressure still does not jump, damage to the stratum can be caused, and the threat to constructors and gas injection equipment can be caused. In addition, the pressure of the equipment is required to be tested before the injection in each large oil field, the pressure value is often difficult to control, the operation is very easy to be overpressured, so that the pipelines are subjected to stabbing and frostbite, operators are stabbed, and the safety valve can be possibly tripped and disabled. Therefore, the existing injection device has the defects of single overpressure protection and low safety.
Disclosure of Invention
The invention aims to provide an oilfield liquid carbon dioxide injection device and an oilfield liquid carbon dioxide injection method, which realize multiple linkage protection of carbon dioxide injection, and have stable and reliable operation and high safety performance.
In order to achieve the above object, the present invention provides an oilfield liquid carbon dioxide injection device connected to a christmas tree for injecting liquid carbon dioxide into an oil well to perform oil extraction, the injection device comprising:
CO for providing liquid carbon dioxide 2 Tank car, said CO 2 The tank truck is provided with a shielding pump;
the liquid supply device comprises a liquid inlet pipeline, wherein one end of the liquid inlet pipeline is provided with a joint assembly, and the joint assembly is connected with a liquid supply end of the shielding pump to form a liquid supply pipeline;
the inlet of the carbon dioxide plunger pump is connected with the other end of the liquid inlet pipeline;
the variable frequency motor is used for driving the carbon dioxide plunger pump to squeeze liquid, and is connected with the carbon dioxide plunger pump;
the controller is connected with the variable frequency motor and used for controlling the running state of the carbon dioxide plunger pump;
one end of the liquid squeezing pipeline is connected with the outlet of the carbon dioxide plunger pump, and the other end of the liquid squeezing pipeline is connected with the Christmas tree; the liquid squeezing pipeline is provided with a safety valve, an electric contact pressure gauge, an outlet pressure transmitter, a vent valve and a pump outlet valve; the outlet pressure transmitter is connected with the controller and is used for acquiring an outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to the controller; the electric contact pressure gauge is connected with the controller and used for setting a limit stop pressure value and sending a stop signal to the controller when the outlet pressure value reaches the limit stop pressure value;
the controller receives the stop signal and controls the carbon dioxide plunger pump to stop, and meanwhile, the controller receives the outlet pressure value, and when the outlet pressure value reaches the highest stop pressure value set in the controller, the controller controls the carbon dioxide plunger pump to stop, so that double stop protection is realized; and when the dual shutdown protection fails, the outlet pressure value continues to be increased to be equal to the setting pressure of the safety valve, and the safety valve is subjected to mechanical pressure relief to form multiple linkage protection.
Further, the joint assembly is provided with a plurality of; the first connector component is connected with the liquid supply end of the shielding pump to form the liquid supply pipeline, the second connector component is connected with the reflux end of the shielding pump to form the reflux pipeline, and the rest connector components are reserved for standby.
Further, each joint assembly comprises an interface, the interfaces are connected with the liquid inlet pipelines, liquid inlet ball valves are arranged between the interfaces and the liquid inlet pipelines, the interfaces are connected with vent pipelines, and the vent pipelines are provided with vent ball valves.
Further, a pump head of the carbon dioxide plunger pump is provided with an air release plug communicated with the pump cavity.
Further, the injection device further includes: a single flow valve; the check valve is arranged on the liquid squeezing pipeline, and the check valve is positioned at the position, close to the Christmas tree, of the other end of the liquid squeezing pipeline and used for preventing the wellhead of the Christmas tree from liquid return.
Further, the injection device further includes: venting the needle valve; the emptying needle valve is arranged on the liquid squeezing pipeline and is positioned between the uniflow valve and the christmas tree.
In another aspect, the invention further provides a method for injecting carbon dioxide by using the oilfield liquid carbon dioxide injection device, which comprises the following steps:
the first joint component is communicated with a liquid supply end of the shielding pump to form a liquid supply pipeline, the emptying valve and the emptying needle valve are closed, and the pump outlet valve is opened;
precooling the liquid supply pipeline;
pre-cooling a liquid inlet pipeline, starting a variable frequency motor after pre-cooling to drive a carbon dioxide plunger pump to increase liquid extrusion, and injecting liquid carbon dioxide into the christmas tree;
setting a limit stop pressure value on the electric contact pressure gauge, and setting a highest stop pressure value on the controller; collecting an outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to a controller; when the outlet pressure value reaches the limit stop pressure value, the electric contact pressure gauge sends a stop signal to the controller, the controller receives the stop signal and controls the carbon dioxide plunger pump to stop, and meanwhile, when the outlet pressure value reaches the highest stop pressure value, the controller controls the carbon dioxide plunger pump to stop, so that double stop protection is realized; and when the dual shutdown protection fails, the outlet pressure value is continuously increased to be equal to the setting pressure of the safety valve, and the safety valve is subjected to mechanical pressure relief to form multiple linkage protection.
Further, the method further comprises the following steps: when the outlet pressure value of the carbon dioxide plunger pump is smaller than the inlet pressure value, the second joint assembly is communicated with the reflux end of the shielding pump to form a reflux pipeline, and part of carbon dioxide medium is refluxed.
Further, the method further comprises the following steps: when the first CO 2 When the carbon dioxide in the tank truck is about to be injected, the second CO2 tank truck is connected with the third joint assembly for uninterrupted injection of the carbon dioxide.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
1. according to the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, the safety valve, the electric contact pressure gauge and the outlet pressure transmitter are arranged on the liquid extrusion pipeline of the carbon dioxide plunger pump, the outlet pressure transmitter is connected with the controller and used for collecting the outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to the controller, the electric contact pressure gauge is connected with the controller and used for setting a limit stop pressure value, and when the outlet pressure value reaches the limit stop pressure value, a stop signal is sent to the controller; the controller receives the shutdown signal and/or the outlet pressure value, controls the running state of the carbon dioxide plunger pump, and forms double shutdown protection with the electric contact pressure gauge and the controller; when the dual shutdown protection fails, the outlet pressure value continues to be increased to be equal to the setting pressure of the safety valve, and the safety valve performs mechanical pressure relief; therefore, multiple linkage protection is formed, over-design pressure construction is prevented, safety of personnel, stratum and oil well is guaranteed to the greatest extent, and the hydraulic oil well control system has the advantages of stable and reliable operation and high safety performance.
2. The oilfield liquid carbon dioxide injection device provided by the embodiment of the invention is formed by the following steps ofA plurality of joint components are arranged on a liquid inlet pipeline of the carbon dioxide plunger pump, so that part of carbon dioxide can be refluxed to CO 2 In the tank truck, the injection flow rate is controlled when the stratum is empty, and the problem that the injection flow rate cannot be controlled in the stratum empty state is solved; and, can connect a plurality of COs simultaneously 2 The tank car is used for continuously injecting carbon dioxide, so that the operation flow is simplified, and the working efficiency is improved.
3. According to the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, the problem that the carbon dioxide plunger pump cannot be started normally due to wellhead reverse liquid can be prevented by arranging the single-flow valve on the liquid squeezing pipeline close to the wellhead end of the christmas tree.
Drawings
FIG. 1 is a schematic diagram of a liquid carbon dioxide injection device in an oilfield provided by an embodiment of the invention;
FIG. 2 is a flow chart of a method for carbon dioxide injection using an oilfield liquid carbon dioxide injection device provided in an embodiment of the present invention;
fig. 3 is a flowchart of another method for injecting carbon dioxide using an oilfield liquid carbon dioxide injection device in accordance with an embodiment of the present invention.
In the figure, 1-CO 2 Tank car, 2-corrugated metal hose, 3-joint assembly, 301-first interface, 302-first feed ball valve, 303-first vent ball valve, 304-first vent line, 305-second interface, 306-second feed ball valve, 307-second vent ball valve, 308-second vent line, 309-third interface, 310-third feed ball valve, 311-third vent ball valve, 312-third vent line, 4-canned pump, 5-feed line, 6-squeeze line, 7-flowmeter, 8-inlet pressure transmitter, 9-variable frequency motor, 10-carbon dioxide plunger pump, 11-vent plug, 12-relief valve, 13-electrical contact pressure gauge, 14-outlet pressure transmitter, 15-vent valve, 16-single flow valve, 17-vent needle valve, 18-controller, 19-pump outlet valve, 20-alarm.
Detailed Description
The embodiment of the invention provides an oilfield liquid carbon dioxide injection device and an oilfield liquid carbon dioxide injection method, which realize multiple linkage protection of carbon dioxide injection, and have stable and reliable operation and high safety performance.
In order to achieve the above object, an embodiment of the present invention provides an injection device for injecting liquid carbon dioxide into an oil well for oil extraction, which is connected to a christmas tree, as shown in fig. 1, the injection device includes:
CO for providing liquid carbon dioxide 2 Tank car 1, said CO 2 Tank truck 1 has a canned motor pump 4;
a liquid inlet pipeline 5, wherein one end of the liquid inlet pipeline 5 is provided with a joint component, and the joint component 3 is connected with a liquid supply end of the shielding pump 4 to form a liquid supply pipeline;
the inlet of the carbon dioxide plunger pump 10 is connected with the other end of the liquid inlet pipeline 5;
a variable frequency motor 9 for driving the carbon dioxide plunger pump 10 to squeeze liquid, wherein the variable frequency motor 9 is connected with the carbon dioxide plunger pump 10;
the controller 18 is connected with the variable frequency motor 9 and is used for controlling the running state of the carbon dioxide plunger pump 10;
the liquid squeezing pipeline 6 is characterized in that one end of the liquid squeezing pipeline 6 is connected with the outlet of the carbon dioxide plunger pump 10, and the other end of the liquid squeezing pipeline 6 is connected with the christmas tree; the liquid squeezing pipeline 6 is provided with a safety valve 12, an electric contact pressure gauge 13, an outlet pressure transmitter 14, a blow-off valve 15 and a pump outlet valve 19; wherein, the outlet pressure transmitter 14 is connected with the controller 18, and is used for collecting the outlet pressure value of the carbon dioxide plunger pump 10 and sending the outlet pressure value to the controller; the electric contact pressure gauge 13 is connected with the controller 18, and is used for setting a stop-limiting pressure value and sending a stop signal to the controller 18 when the outlet pressure value reaches the stop-limiting pressure value;
wherein, the controller 18 receives the stop signal and controls the carbon dioxide plunger pump 10 to stop, and meanwhile, the controller 18 receives the outlet pressure value, and when the outlet pressure value reaches the highest stop pressure value set in the controller 18, the controller 18 controls the carbon dioxide plunger pump 10 to stop, so as to realize double stop protection; when the dual shutdown protection fails, the outlet pressure continues to increase to be equal to the set pressure of the relief valve 12, and the relief valve 12 mechanically relieves pressure, forming multiple interlock protection.
In this embodiment, the injection device further includes: an alarm 20; the alarm 20 is connected with the controller 18, the controller 18 is further configured to set an alarm pressure value, and when the outlet pressure value received by the controller 18 reaches the alarm pressure value, the controller 18 controls the alarm 20 to alarm; wherein the alarm pressure value is less than the shutdown limit pressure value. The alarm 20 is controlled to alarm before the outlet pressure reaches the limit stop pressure value, so that the alarm can be used for reminding on-site operators of the fact that the limit stop pressure value is about to be reached, safety is required to be paid attention, and emergency or stop preparation is made. The alarm 20, the controller 18, the electrical contact pressure gauge 13, the outlet pressure transmitter 14 and the safety valve 12 together provide multiple interlock protection.
In this embodiment, the joint assembly 3 is provided with a plurality of joint assemblies; the first joint component is connected with the liquid supply end of the shielding pump 4 through the corrugated metal hose 2 to form the liquid supply pipeline, the second joint component is connected with the reflux end of the shielding pump 4 through the corrugated metal hose 2 to form the reflux pipeline, and the rest joint components are reserved for standby, so that the displacement control range of the injection system can be effectively increased. The oil well for selecting and injecting carbon dioxide has serious stratum deficiency, the outlet pressure value of the carbon dioxide plunger pump 10 is smaller than the inlet pressure value after the equipment is normally operated, the liquid discharge valve of the carbon dioxide plunger pump 10 is in a normally open state due to the existence of pressure difference, the larger the pressure difference is, the larger the flow is, the more the flow is similar to the rated flow of the shielding pump 4, and at the moment, the flow cannot be controlled by a method of adjusting the frequency of the variable frequency motor 9 through the controller 18. If the flow exceeds the maximum design displacement, or at CO 2 When the tank truck 1 is filled quickly and the following tank truck cannot arrive on time, the construction effect is affected. By providing a plurality of joint assemblies 3 to form a return line, part of the carbon dioxide can be returned to the CO 2 In the tank truck 1, the injection speed is controlled when the stratum is deficient, and the stratum deficiency is solvedIn a state, the injection flow cannot be controlled; in addition, by providing a plurality of joint assemblies 3, a plurality of CO's can be connected simultaneously 2 Tank car, continuous and uninterrupted carbon dioxide injection, avoids CO when 2 CO in tank truck 1 2 After filling, the next CO is removed by stopping midway 2 The tank car can be connected again for injection, so that the production efficiency is improved.
Each joint assembly 3 comprises an interface, the interface is connected with the liquid inlet pipeline 5, a liquid inlet ball valve is arranged between the interface and the liquid inlet pipeline 5, an emptying pipeline is connected with the interface, and the emptying ball valve is arranged on the emptying pipeline. The venting line leads to the high pressure end of the carbon dioxide plunger pump 10, preventing the vented dry ice from injuring the operator.
The number of the joint assemblies 3 is three or more, preferably three, including a first joint assembly, a second joint assembly and a third joint assembly; the first joint assembly comprises a first interface 301 connected with the liquid inlet pipeline 5, a first liquid inlet ball valve 302 is arranged between the first interface 301 and the liquid inlet pipeline 5, the first interface 301 is connected with a first emptying pipeline 304, and a first emptying ball valve 303 is arranged on the first emptying pipeline 304; the second joint assembly comprises a second interface 305 connected with the liquid inlet pipeline 5, a second liquid inlet ball valve 306 is arranged between the second interface 305 and the liquid inlet pipeline 5, the second interface 305 is connected with a second vent pipeline 308, and the second vent pipeline 308 is provided with a second vent ball valve 307; the third joint assembly comprises a third interface 309 connected with the liquid inlet pipeline 5, a third liquid inlet ball valve 310 is arranged between the third interface 309 and the liquid inlet pipeline 5, the third interface 309 is connected with a third emptying pipeline 312, and a third emptying ball valve 311 is arranged on the third emptying pipeline 312. Specifically, the first port 301 is connected to the liquid supply end of the shielding pump 4 through the corrugated metal hose 2 to form the liquid supply pipeline, the second port 305 is connected to the return end of the shielding pump 4 through the corrugated metal hose 2 to form the return pipeline, and the third port 309 is used as a pipeline for the next CO 2 And a standby interface connected with the tank truck.
In this embodiment, a pump head of the carbon dioxide plunger pump 10 is provided with a gas release plug 11 which is communicated with the pump cavity. Preferably, a plurality of the air release plugs 11 are provided and are provided at the middle position of the pump cavity of the carbon dioxide plunger pump 10. By opening the air release plug 11, the air in the pump cavity of the carbon dioxide plunger pump 10 can be discharged rapidly and effectively, so that the carbon dioxide plunger pump 10 runs normally, the problem that the carbon dioxide plunger pump 10 has an airlock in the running process is solved, and the phenomenon that the outlet of the carbon dioxide plunger pump 10 is blocked due to the airlock is prevented.
In this embodiment, the injection device further includes: a flow meter 7 and an inlet pressure transmitter 8 arranged on the feed line 5; the flowmeter 7 and the inlet pressure transmitter 8 are connected with the controller 18 and are respectively used for measuring the flow rate of the liquid inlet pipeline 5 and the inlet pressure value of the carbon dioxide plunger pump 10.
In this embodiment, the injection device further includes: a check valve 16; the check valve 16 is disposed on the squeeze pipe 6, and the check valve 16 is disposed at a position where the other end of the squeeze pipe 6 approaches the christmas tree, so as to prevent the christmas tree from reversing the wellhead. When the injection device is stopped due to failure and the wellhead valve of the christmas tree is opened after the maintenance is finished, and the carbon dioxide plunger pump 10 is restarted, the injected carbon dioxide can flow back to the liquid squeezing pipeline 6, and the check valve 16 plays a role in stopping liquid backflow, so that the problem that the carbon dioxide plunger pump 10 cannot normally operate due to liquid flowing is avoided.
In this embodiment, the injection device further includes: an air discharge needle valve 17; the venting needle valve 17 is arranged on the liquid squeezing pipeline 6, and the venting needle valve 17 is positioned between the uniflow valve 16 and the christmas tree. The venting needle valve 17 is used for venting pressure.
In this embodiment, the injection device further includes an intelligent terminal; the intelligent terminal is connected with the controller 18 and is used for acquiring data of the controller 18 to realize man-machine interaction; wherein, intelligent terminal includes: a smart phone or tablet or a smart terminal device with an independent operating system and an independent running space.
It should be noted that the positions of the flowmeter 7 and the inlet pressure transmitter 8 may be interchanged, and are not limited by the positions in fig. 1. In addition, the relative positions of the relief valve 12, the electrical contact pressure gauge 13, the outlet pressure transmitter 14, the vent valve 15, and the pump outlet valve 19 are not limited by the positions of fig. 1.
As can be seen from the above, in the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, the alarm 20, the electric contact pressure gauge 13, the outlet pressure transmitter 14 and the safety valve 12 are arranged on the liquid extrusion pipeline 6 at the high pressure end of the carbon dioxide plunger pump 10, and form multistage linkage protection together with the controller 18, so that over-design pressure construction is prevented, and personnel, stratum and oil well safety are guaranteed to the greatest extent; by arranging a plurality of joint assemblies 3 on the liquid inlet pipeline 5 at the low pressure end, part of carbon dioxide can be refluxed to CO 2 In the tank truck, the injection flow is controlled when stratum is empty, and a plurality of COs can be connected 2 The tank truck realizes continuous injection, so that the working efficiency is improved; by arranging the air release plug 11 on the pump cavity of the carbon dioxide plunger pump 10, the problem that the carbon dioxide plunger pump 10 has an airlock in the running process is avoided; by providing the single flow valve 16 on the squeeze tube 6 near the wellhead of the christmas tree, the problem that the carbon dioxide plunger pump 10 cannot be started due to wellhead reverse fluid when restarting the device after stopping is avoided.
On the other hand, based on the same inventive concept, the embodiment of the invention also provides a method for injecting carbon dioxide by using the oilfield liquid carbon dioxide injection device, as shown in fig. 2, which comprises the following steps:
step S110: the first joint component 3 is communicated with the liquid supply end of the shielding pump 4 to form a liquid supply pipeline, the vent valve 15 and the vent needle valve 17 are closed, and the pump outlet valve 19 is opened;
step S120: precooling the liquid supply pipeline;
step S130: pre-cooling the liquid inlet pipeline 5, starting the variable frequency motor 9 to drive the carbon dioxide plunger pump 10 to increase the liquid pressure after pre-cooling, and injecting liquid carbon dioxide into the christmas tree;
step S140: setting a limit stop pressure value on the electric contact pressure gauge 13 and setting a highest stop pressure value on the controller 18; collecting an outlet pressure value of the carbon dioxide plunger pump 10 and sending the outlet pressure value to the controller 18; when the outlet pressure value reaches the limit stop pressure value, the electric contact pressure gauge 13 sends a stop signal to the controller 18, the controller 18 receives the stop signal and controls the carbon dioxide plunger pump 10 to stop, and simultaneously, when the outlet pressure value reaches the maximum stop pressure value, the controller 18 controls the carbon dioxide plunger pump 10 to stop, so that double stop protection is realized; when the dual shutdown protection fails, the outlet pressure continues to increase to be equal to the set pressure of the relief valve 12, and the relief valve 12 mechanically relieves pressure, forming multiple interlock protection.
In the step S140, an alarm pressure value may be set in the controller 18 at the same time, and when the outlet pressure value of the carbon dioxide plunger pump 10 received by the controller 18 reaches the alarm pressure value, the controller 18 controls the alarm 20 to alarm; wherein the alarm pressure value is less than the shutdown limit pressure value.
The step S140 may be performed simultaneously with the step S110, the step S120, and the step S130, or may be performed before the step S110.
During injection, when the outlet pressure value acquired by the outlet pressure transmitter 14 is smaller than the inlet pressure value acquired by the inlet pressure transmitter 8, the second joint assembly is communicated with the reflux end of the shielding pump to form a reflux pipeline, and part of carbon dioxide medium is refluxed to CO 2 And the tank truck 1.
In order to achieve continuous injection of carbon dioxide, the injection method of the present embodiment further includes: when the first CO 2 When the carbon dioxide in the tank truck is about to be injected, the second CO2 tank truck is connected with the third joint assembly for uninterrupted injection of the carbon dioxide.
To better illustrate the method of carbon dioxide injection using the oilfield liquid carbon dioxide injection device of this embodiment, an embodiment of the present invention will be described with reference to fig. 3.
Step S210: first CO with corrugated metal hose 2 2 The first shielding pump of the tank truck is connected with a first interface 301, a first emptying ball valve 303 and a first liquid inlet ball valve 302 are opened, other liquid inlet ball valves and emptying ball valves are closed, a first liquid supply pipeline is formed between the first shielding pump and the first interface 301, a gas release plug 11 on the pump head of the carbon dioxide plunger pump 10 is opened, an emptying valve 15 and an emptying needle valve 17 are closed, and a pump outlet valve 19 is opened;
step S220: setting an alarm pressure value and a highest shutdown pressure value on the controller 18, and setting a limit shutdown pressure value on the electric contact pressure gauge 13; wherein the alarm pressure value is less than the limit shutdown pressure value, which is equal to the highest shutdown pressure value;
during the injection process, when the outlet pressure value acquired by the outlet pressure transmitter 14 reaches an alarm pressure value, the alarm 20 alarms to remind the site operator of reaching a limit stop pressure value, and the safety needs to be paid attention to, so that emergency or stop preparation is made; when the outlet pressure value continues to rise to the limit stop pressure value, the electric contact pressure gauge 13 sends a stop signal to the controller 18, the controller 18 receives the stop signal and controls the carbon dioxide plunger pump 10 to stop, and meanwhile, when the outlet pressure value received by the controller 18 reaches the set highest stop pressure value, the controller 18 stops the carbon dioxide plunger pump 10 by controlling the variable frequency motor 9, and the electric contact pressure gauge 13 and the controller 18 simultaneously play a role in stopping protection, so that overpressure construction when the electric contact pressure gauge 13 fails in protection is avoided; if the double protection fails, the outlet pressure value still rises to reach the setting pressure of the safety valve 12, and the safety valve 12 automatically jumps to perform mechanical pressure relief, so that the safety of personnel, gas injection equipment and an oil well is ensured. Wherein, alarm 20, controller 18, electric contact manometer 13, export pressure transmitter 14 and relief valve 12 play multiple interlocking protection jointly.
It should be noted that step S220 may be performed simultaneously with step S210 or may be interchanged.
Step S230: precooling the first liquid supply pipeline; the method comprises the following steps: starting a first canned motor pump, a first CO 2 The tank truck is used for delivering liquid,when the outlet of the first emptying pipeline 304 emits the dense white carbon dioxide, indicating that the first liquid supply pipeline is precooled, discharging the gas, and closing the first emptying ball valve 303;
step 240, precooling the liquid inlet pipeline 5, starting the variable frequency motor 9 to drive the carbon dioxide plunger pump 10 to increase the liquid pressure after precooling, and injecting liquid carbon dioxide into the christmas tree;
the step S240 specifically includes: when gas is pierced from the gas release plug 11, the controller 18 starts the variable frequency motor 9 at low frequency and drives the carbon dioxide plunger pump 10 to pressurize and squeeze liquid, when the carbon dioxide in the carbon dioxide plunger pump 10 is discharged in a pulse shape through the gas release plug 11, the liquid inlet pipeline 5 is proved to be completely precooled and filled with liquid carbon dioxide, and the gas release plugs 11 are closed one by one at the moment to inject the carbon dioxide.
Step S250: adjusting the vent plug 11 or the first vent ball valve 303 to stabilize the display values of the flowmeter 7 and the inlet pressure transmitter 8 and enable the carbon dioxide to be injected normally;
wherein the vent plug 11 plays a role of venting and preventing airlock, and the first vent ball valve 303 and the first vent pipeline 304 play a role of adjusting hydraulic pressure supplied by the first shielding pump.
Step S260: when the outlet pressure value acquired by the outlet pressure transmitter 14 is smaller than the inlet pressure value acquired by the inlet pressure transmitter 8, the second connector 305 is connected with the reflux end of the first shielding pump by the corrugated metal hose 2, the second emptying ball valve 307 is closed, the second liquid inlet ball valve 306 is opened to form a reflux pipeline, and part of carbon dioxide medium is refluxed to the first CO 2 The tank truck is internally provided with a tank truck;
if the outlet pressure value is larger than the inlet pressure value, a return pipeline can be omitted, and the controller 18 is used for adjusting the variable frequency motor 9 to adjust the injection flow of the carbon dioxide plunger pump 10. Wherein the second interface 305 functions to control the injection flow rate at reflux.
In the injection process, when equipment fails and needs to be shut down for maintenance, the first shielding pump, the carbon dioxide plunger pump 10 and the first CO are closed 2 Opening a first emptying ball valve 303, a gas release plug 11 and a discharging valve of a liquid supply valve and a christmas tree wellhead valve of the tank truckThe air valve 15 and the air discharge needle valve 17 are used for pressure relief; and after the maintenance is finished, the injection is carried out again, the wellhead valve of the christmas tree is opened, and the check valve 16 plays a role in preventing wellhead reverse fluid and preventing the starting of the carbon dioxide plunger pump 10 from being blocked.
Step S270: when the first CO 2 When the carbon dioxide in the tank truck is about to be injected, the second CO 2 The tank truck is connected with the third joint assembly to perform uninterrupted injection of carbon dioxide;
the step S270 specifically includes: when the first CO 2 When the carbon dioxide in the tank truck is about to be injected, the second CO 2 The tank truck is connected with a third interface 309 through a corrugated metal hose 2, closes a third liquid inlet ball valve 310 and opens a third emptying ball valve 311; when the first CO 2 After the carbon dioxide in the tank truck is injected, starting a second CO 2 The second canned motor pump of the tank car supplies liquid, when third emptying pipeline 312 has thorn to leak thick white gas, opens third feed liquor ball valve 310, forms the second liquid supply pipeline, closes third emptying ball valve 311. Wherein the third interface 309 is connected with the second CO in advance 2 And the tank truck ensures the continuous injection effect.
In the second CO 2 After tank truck is supplied with liquid, the first CO 2 The tank truck is stopped, the first liquid inlet ball valve 302 is closed, the first emptying ball valve 303 is opened to release pressure, and then the first CO is removed 2 And (5) a tank car. In the pressure release process, due to the pressure difference, dry ice is easy to be formed in the corrugated metal hose 2 close to one end of the first emptying ball valve 303, so that the dry ice is easy to form with the first CO 2 One end of the tank car connected cannot be decompressed, so the first CO is recycled 2 And opening a self-contained emptying valve of the tank truck to release pressure, and observing whether the pressure gauge of the first shielding pump outlet returns to zero. In order to ensure that the corrugated metal hose 2 is unblocked, and avoid that dry ice exists in the middle of the corrugated metal hose, an impact force generated by rapid gasification damages an operator, and the first CO can be closed again 2 The tank car is provided with a vent valve, and a small amount of gaseous carbon dioxide is simultaneously sent, so that whether gas is leaked from the tail end of the first vent pipeline 304 is observed. The first emptying pipeline 304 plays roles of emptying, pressure relief and inspection protection, and effectively prevents the dry ice generated by the corrugated metal hose 2 from injuring operators.
It is necessary to say thatIt is to be noted that, in the present embodiment, the joint assembly 3 may be provided with four, five, six, etc. as needed, and may be connected with a plurality of CO at the same time 2 And (5) a tank car.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
1. according to the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, the safety valve, the electric contact pressure gauge and the outlet pressure transmitter are arranged on the liquid extrusion pipeline of the carbon dioxide plunger pump, the outlet pressure transmitter is connected with the controller and used for collecting the outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to the controller, the electric contact pressure gauge is connected with the controller and used for setting a limit stop pressure value, and when the outlet pressure value reaches the limit stop pressure value, a stop signal is sent to the controller; the controller receives the shutdown signal and/or the outlet pressure value, controls the running state of the carbon dioxide plunger pump, and forms double shutdown protection with the electric contact pressure gauge and the controller; when the dual shutdown protection fails, the outlet pressure value continues to be increased to be equal to the setting pressure of the safety valve, and the safety valve performs mechanical pressure relief; therefore, multiple linkage protection is formed, over-design pressure construction is prevented, safety of personnel, stratum and oil well is guaranteed to the greatest extent, and the hydraulic oil well control system has the advantages of stable and reliable operation and high safety performance.
2. According to the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, a plurality of joint assemblies are arranged on the liquid inlet pipeline of the carbon dioxide plunger pump, so that part of carbon dioxide can be refluxed to CO 2 In the tank truck, the injection flow rate is controlled when the stratum is empty, and the problem that the injection flow rate cannot be controlled in the stratum empty state is solved; and, can connect a plurality of COs simultaneously 2 The tank car is used for continuously injecting carbon dioxide, so that the operation flow is simplified, and the working efficiency is improved.
3. According to the oilfield liquid carbon dioxide injection device provided by the embodiment of the invention, the problem that the carbon dioxide plunger pump cannot be started normally due to wellhead reverse liquid can be prevented by arranging the single-flow valve on the liquid squeezing pipeline close to the wellhead end of the christmas tree.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (7)
1. An oilfield liquid carbon dioxide injection device connected with a christmas tree for injecting liquid carbon dioxide into an oil well for oil extraction, the injection device comprising:
a CO2 tank car for providing liquid carbon dioxide, the CO2 tank car having a barrier pump;
the liquid supply device comprises a liquid inlet pipeline, wherein one end of the liquid inlet pipeline is provided with a joint assembly, and the joint assembly is connected with a liquid supply end of the shielding pump to form a liquid supply pipeline; the joint assembly is provided with a plurality of joints; the first connector component is connected with the liquid supply end of the shielding pump to form a liquid supply pipeline, the second connector component is connected with the reflux end of the shielding pump to form a reflux pipeline, and the rest connector components are reserved for standby; each joint assembly comprises an interface, the interface is connected with the liquid inlet pipeline, a liquid inlet ball valve is arranged between the interface and the liquid inlet pipeline, the interface is connected with a vent pipeline, and the vent pipeline is provided with a vent ball valve;
the inlet of the carbon dioxide plunger pump is connected with the other end of the liquid inlet pipeline; the emptying pipeline is communicated with the high-pressure end of the carbon dioxide plunger pump;
the variable frequency motor is used for driving the carbon dioxide plunger pump to squeeze liquid, and is connected with the carbon dioxide plunger pump;
the controller is connected with the variable frequency motor and used for controlling the running state of the carbon dioxide plunger pump;
one end of the liquid squeezing pipeline is connected with the outlet of the carbon dioxide plunger pump, and the other end of the liquid squeezing pipeline is connected with the Christmas tree; the liquid squeezing pipeline is provided with a safety valve, an electric contact pressure gauge, an outlet pressure transmitter, a vent valve and a pump outlet valve; the outlet pressure transmitter is connected with the controller and is used for acquiring an outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to the controller; the electric contact pressure gauge is connected with the controller and used for setting a limit stop pressure value and sending a stop signal to the controller when the outlet pressure value reaches the limit stop pressure value;
the controller receives the stop signal and controls the carbon dioxide plunger pump to stop, and meanwhile, the controller receives the outlet pressure value, and when the outlet pressure value reaches the highest stop pressure value set in the controller, the controller controls the carbon dioxide plunger pump to stop, so that double stop protection is realized; when the dual shutdown protection fails, the outlet pressure value continues to be increased to be equal to the setting pressure of the safety valve, and the safety valve mechanically decompresses to form multiple linkage protection;
the alarm is connected with the controller, the controller is also used for setting an alarm pressure value, and when the outlet pressure value received by the controller reaches the alarm pressure value, the controller controls the alarm to alarm; wherein the alarm pressure value is less than the shutdown limit pressure value.
2. The oilfield liquid carbon dioxide injection device according to claim 1, wherein a pump head of the carbon dioxide plunger pump is provided with a vent plug communicated with the pump cavity.
3. The oilfield liquid carbon dioxide injection device of claim 1, wherein the injection device further comprises: a single flow valve; the check valve is arranged on the liquid squeezing pipeline, and the check valve is positioned at the position, close to the Christmas tree, of the other end of the liquid squeezing pipeline and used for preventing the wellhead of the Christmas tree from liquid return.
4. The oilfield liquid carbon dioxide injection device of claim 3, wherein the injection device further comprises: venting the needle valve; the emptying needle valve is arranged on the liquid squeezing pipeline and is positioned between the uniflow valve and the christmas tree.
5. A method of carbon dioxide injection using the oilfield liquid carbon dioxide injection device of claim 1, comprising:
the first joint component is communicated with a liquid supply end of the shielding pump to form a liquid supply pipeline, the emptying valve and the emptying needle valve are closed, and the pump outlet valve is opened;
precooling the liquid supply pipeline;
pre-cooling a liquid inlet pipeline, starting a variable frequency motor after pre-cooling to drive a carbon dioxide plunger pump to increase liquid extrusion, and injecting liquid carbon dioxide into the christmas tree;
setting a limit stop pressure value on the electric contact pressure gauge, and setting a highest stop pressure value on the controller; collecting an outlet pressure value of the carbon dioxide plunger pump and sending the outlet pressure value to a controller; when the outlet pressure value reaches the limit stop pressure value, the electric contact pressure gauge sends a stop signal to the controller, the controller receives the stop signal and controls the carbon dioxide plunger pump to stop, and meanwhile, when the outlet pressure value reaches the highest stop pressure value, the controller controls the carbon dioxide plunger pump to stop, so that double stop protection is realized; and when the dual shutdown protection fails, the outlet pressure value is continuously increased to be equal to the setting pressure of the safety valve, and the safety valve is subjected to mechanical pressure relief to form multiple linkage protection.
6. The method of carbon dioxide injection of claim 5, further comprising: when the outlet pressure value of the carbon dioxide plunger pump is smaller than the inlet pressure value, the second joint assembly is communicated with the reflux end of the shielding pump to form a reflux pipeline, and part of carbon dioxide medium is refluxed.
7. The method of carbon dioxide injection of claim 5, further comprising: when the carbon dioxide in the first CO2 tank truck is about to be injected, the second CO2 tank truck is connected with the third joint assembly for uninterrupted injection of the carbon dioxide.
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| CN109973060B (en) * | 2019-04-23 | 2024-03-15 | 西安长庆科技工程有限责任公司 | Device and method for improving oil field recovery ratio |
| US11994009B2 (en) | 2020-03-31 | 2024-05-28 | Saudi Arabian Oil Company | Non-explosive CO2-based perforation tool for oil and gas downhole operations |
| CN112196753B (en) * | 2020-10-09 | 2022-07-05 | 西安航天动力研究所 | CO (carbon monoxide)2Infusion pump system |
| CN113374453A (en) * | 2021-07-13 | 2021-09-10 | 秦昊良 | Carbon dioxide gas injection device for carbon dioxide flooding |
| CN114542986B (en) * | 2022-04-24 | 2022-07-05 | 中国石油化工股份有限公司胜利油田分公司 | Liquid carbon dioxide low-temperature closed injection device |
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