CN112627775A - Cluster oil well multi-wellhead wheel-patrol drip-type injection system and method - Google Patents
Cluster oil well multi-wellhead wheel-patrol drip-type injection system and method Download PDFInfo
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- 239000007924 injection Substances 0.000 title claims abstract description 222
- 239000003129 oil well Substances 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 24
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
Abstract
The invention provides a cluster oil well multi-wellhead polling and dropping type injection system and a method, during operation, only parameters such as discharge capacity, injection interval period, daily injection amount of each oil well and the like of a metering plunger pump need to be set on a remote monitoring platform, the remote monitoring platform automatically calculates the start-stop duration of the metering plunger pump in the dosing interval period of an oil well according to the set parameters, and sends the start-stop duration to a well site PLC through an oil area local area network. And in the interval period of injection, the PLC controls the solenoid valve of the medicine tank, the metering plunger pump and the solenoid valve of the oil well to be opened in turn according to the calculated starting and stopping time length of the metering plunger pump so as to perform polling injection on each oil well in turn, thereby realizing the polling injection of the oil wells with small dose in cluster wells and overcoming the defect that the effect of the medicine in the shaft cannot be continuously exerted after the medicine is added once. The invention not only has simple operation, but also reduces the one-time investment cost in the early stage, meets the requirement of continuously exerting the effect of the chemical agent in the shaft of the oil well, and ensures the reliable operation of the oil well production of the oil field.
Description
Technical Field
The invention belongs to the technical field of oil extraction in oil fields, and particularly relates to a multi-wellhead wheel-patrol drip-type agent injection system and method for a cluster oil well.
Background
In the oil extraction production process of an oil field, various medicaments such as wax removing and preventing agents, corrosion and scale inhibiting agents, hydrogen sulfide inhibitors and the like are required to be added into the air of an oil well oil jacket ring in order to ensure the normal production of the oil well. At present, most oil well mouth injection still adopts traditional manual work to go up the well regularly, uses the airtight injection device of artifical simple and easy area with pressure to add quantitative medicament by oil jacket annular space once only, and this kind of manual injection has a great deal of drawback, if use personnel many, and workman intensity of labour is big, can't satisfy the interior medicine effect of pit shaft and play continuously.
With the gradual improvement of the automation level of the oil field, more and more oil wells adopt automatic agent injection devices for adding agents, but the agents are injected into single wells by a single machine, and with the gradual deepening of the oil field development, cluster well groups are mostly adopted in oil field well sites. The cluster well group is the product of the technical progress of oil field drilling engineering and development, and the appearance of the cluster well group can have positive influence and effect on the design and construction of oil field ground engineering. The cluster well group is that a plurality of wells are drilled at a well site, the well heads of the wells are spaced by less than several meters, and the well bottoms of the wells extend to different directions. The single-machine injection mode for a single well causes the problems of large one-time investment in the early stage and high operation and later maintenance costs of an oil field well site injection device. Therefore, a device and a method for injecting agent based on program control are needed to be explored, the defects of manual agent adding and the existing automatic agent injection device are overcome, and convenience, economy and reliability of agent injection of cluster well groups are ensured.
Disclosure of Invention
The invention provides a cluster oil well multi-wellhead wheel-inspection drip-type injection system and a cluster oil well multi-wellhead wheel-inspection drip-type injection method, which aim to overcome the defects of a plurality of traditional manual wellhead injection, such as large manual workload, high labor intensity, low automation degree and incapability of continuously exerting the effect of a medicament in a shaft by adding the medicament once; the second purpose is to overcome the problems that the existing automatic dosing device can only inject the agent into a single well by a single machine, the one-time investment in the early stage is large, and the operation and later maintenance costs are high.
In order to solve the technical problems, the invention provides the following technical scheme:
a multi-wellhead polling drip-type agent injection method for a cluster oil well comprises the following steps:
step S1, firstly, setting the displacement of the metering plunger pump, the interval period of the injection agent and the daily injection amount of each oil well on a remote control platform;
step S2, calculating the injection dosage of each oil well and the total injection dosage of the well group in the injection interval period;
step S3, calculating the start-stop duration of the metering plunger pump in the interval period of oil well agent injection;
step S4, the remote monitoring platform sends the automatically calculated start-stop time length of the metering plunger pump in the oil well dosing interval period to a well site PLC through an oil area local area network;
step S5, the PLC program starts to execute the injection program at a whole point according to the set injection interval period, the PLC controls the opening of a medicine tank electromagnetic valve, a metering plunger pump and a wellhead electromagnetic valve of a specified oil well, then the medicine in the medicine tank is sucked by the metering plunger pump and is discharged into an oil jacket annulus of the specified oil well through an injection pipeline through the wellhead electromagnetic valve corresponding to the specified oil well through a manifold, and finally when the starting time of the metering plunger pump is equal to the starting and stopping time of the metering plunger pump in the injection interval period of the oil well, the PLC controls the closing of the medicine tank electromagnetic valve, the metering plunger pump and the wellhead electromagnetic valve of the specified oil well to finish the injection of the specified oil well;
step S6, the PLC completes the injection of the chemicals into the other oil wells one by one according to the start-stop duration of the metering plunger pump in each oil well dosing interval period, and then stops the machine;
and step S7, repeating the steps S5 and S6 in the next injection interval period.
Further, the unit of the injection interval period in step S1 is hour, and the maximum value thereof does not exceed 24.
Further, the step S2 is to evenly distribute the daily injection amount of each oil well in the injection interval period, where the specific calculation formula is as follows:
wherein D isTThe injection amount of a single oil well in an injection interval period;
t is the injection interval period;
h is a constant with a value of 24H;
d is the daily injection amount of a single oil well.
Further, the total injection dosage of the well group in the injection interval period of the step S2 should satisfy the following formula:
wherein n is the number of oil wells in the well group;
DTithe injection amount of the ith oil well in the injection interval period;
q is the pump displacement of the metering plunger pump.
Further, the calculation formula of the start-stop time length of the metering plunger pump in the step S3 dosage interval period is as follows:
t＝DT×Q
wherein t is the start-stop duration of the metering plunger pump in the oil well dosing interval period;
DTthe injection amount of a single oil well in an injection interval period;
q is the pump displacement of the metering plunger pump.
A multi-wellhead wheel-patrolling drip-type injection system for a cluster oil well comprises a remote monitoring platform and a PLC (programmable logic controller), wherein the remote monitoring platform transmits signals to the PLC, the PLC transmits the signals to an injection device through a power line network, the injection device comprises a medicine tank, a medicine tank electromagnetic valve, a metering plunger pump, a manifold and a wellhead electromagnetic valve, the medicine tank is connected with a suction inlet of the metering plunger pump through the medicine tank electromagnetic valve, and a discharge outlet of the metering plunger pump is connected to a target oil well through the manifold and the wellhead electromagnetic valve;
further, the medicine tank electromagnetic valve, the metering plunger pump and the wellhead electromagnetic valve are respectively electrically connected with the PLC.
Furthermore, the oil wells are provided with a plurality of oil wells, the wellhead of each oil well is correspondingly provided with a wellhead electromagnetic valve, and when the specified oil well is injected with the agent, the wellhead electromagnetic valves of the rest oil wells are kept closed.
Further, the remote monitoring platform is a remote control terminal.
The medicine tank electromagnetic valve and the wellhead electromagnetic valve are both normally closed high-pressure electromagnetic ball valves.
Furthermore, the medicine jar is one or more, and a plurality of medicine jars connect in parallel and set up, and every medicine jar is connected with the sunction inlet of measurement plunger pump through a medicine jar solenoid valve respectively.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the daily injection dosage of the oil well is distributed into the dosing interval period, and each oil well is sequentially injected in a round trip mode according to the small injection dosage obtained by calculation in the dosing interval period, so that the oil well wellhead round trip drip injection of the well group in a plurality of continuous injection interval periods every day is realized, and the defect that the effect of the medicine in the shaft cannot be continuously exerted by one-time dosing of the medicine is overcome.
2. The invention overcomes the problems that manual injection uses more personnel, the labor intensity is high, the continuous exertion of the effect of the medicament in the shaft can not be satisfied by one-time adding of the medicament, the one-time investment in the early stage of single-well injection of the existing automatic injection device is large only by one machine, and the operation and later maintenance costs are high, the PLC is only required to simply control the electromagnetic valve and the metering plunger pump according to the program, the small-dose round-inspection drip injection of the cluster well group oil well can be realized without manual intervention, the operation is simple, the one-time investment cost in the early stage is reduced, the requirement of the continuous exertion of the effect of the medicament in the shaft of the oil well is satisfied, and the reliable operation of the production of the oil well in the.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other designs and drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a multi-well head polling drip-type agent injection device for a cluster oil well.
FIG. 2 is a flow chart of the multiple well head polling drip injection method for the periodic execution of the injection intervals.
Description of reference numerals:
1. a remote monitoring platform; 2. a PLC; 3. a medicine tank; 4. a medicine tank electromagnetic valve; 5. a metering plunger pump; 6. collecting pipes; 7. a wellhead solenoid valve; 8. an oil well; 9. and (4) an injection device.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions.
First embodiment
Referring to fig. 1, a first embodiment of the present invention relates to a method for performing a multi-well head polling and spot-dropping type injection of a cluster oil well, comprising the steps of:
step S1, firstly, the displacement of the metering plunger pump 5, the interval period of the injection agent and the 8 daily injection amount of each oil well are set on the remote control platform 1;
step S2, calculating 8 injection doses of each oil well and the total injection dose of each well group in the injection interval period;
step S3, calculating the start-stop duration of the metering plunger pump 5 in the interval period of oil well injection;
step S4, the remote monitoring platform 1 sends the automatically calculated start-stop time length of the metering plunger pump 5 in the oil well dosing interval period to a well site PLC2 through an oil area local area network;
step S5, the PLC program starts to execute the injection program at a whole point according to the set injection interval period, firstly the PLC controls the opening of the medicine tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of the designated oil well 8, then the medicine in the medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the designated oil well 8 through the injection pipeline through the manifold 6 and the wellhead electromagnetic valve 7 corresponding to the designated oil well, and finally when the starting time of the metering plunger pump 5 is equal to the starting and stopping time of the metering plunger pump 5 in the oil well injection interval period, the PLC controls the closing of the medicine tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of the designated oil well 8, and the injection of the designated oil well 8 is completed;
step S6, the PLC2 completes the injection of the medicaments into the other oil wells 8 one by one according to the start-stop time length of the metering plunger pump 5 in the medicament adding interval period of each oil well 8, and then stops the machine;
and step S7, repeating the steps S5 and S6 in the next injection interval period.
When the program control-based cluster oil well multi-wellhead polling and spot-dropping type injection method provided by the invention is operated, only parameters such as the discharge capacity of the metering plunger pump, the injection interval period, the daily injection dosage of each oil well and the like need to be set on the remote monitoring platform, the remote monitoring platform automatically calculates the start-stop duration of the metering plunger pump in the dosing interval period of the oil well according to the set parameters, and sends the start-stop duration to a PLC (programmable logic controller) in the injection device on a well site through an oil area local area network. In the interval period of the injection, the PLC controls the electromagnetic valve of the medicine tank, the metering plunger pump and the electromagnetic valve of the oil well to be opened in turn according to the start-stop time length of the metering plunger pump obtained by calculation to perform the rotation injection on each oil well, therefore, the small-dose polling drip injection of the cluster well group oil well is realized, the problems that manual injection uses more personnel, the labor intensity is high, the continuous exertion of the effect of the medicine in the shaft cannot be met by one-time adding of the medicine, the one-time investment of the prior automatic injection device in the early stage of single-well injection is large only, and the operation and later maintenance cost is high are solved, the PLC is only required to simply control the electromagnetic valve and the metering plunger pump according to a program, the small-dose polling drip injection of the cluster well group oil well can be realized without manual intervention, the operation is simple, the one-time investment cost in the early stage is reduced, the requirement of the continuous exertion of the effect of the medicine in the shaft of the oil well is met, and the reliable operation of the production of the oil well is ensured.
Second embodiment
The second embodiment of the invention relates to a multi-wellhead polling and dropping type injection method for a cluster oil well, which comprises the following steps:
step S1, firstly, the displacement of the metering plunger pump 5, the interval period of the injection agent and the 8 daily injection amount of each oil well are set on the remote control platform 1; wherein, the unit of the injection interval period is hour, and the maximum value is not more than 24;
step S2, calculating 8 injection dosages and total injection dosages of well groups of each oil well in the injection interval period, which is equivalent to evenly distributing the daily injection dosages of the single well in the injection interval period, wherein the specific calculation formula is as follows:
wherein D isTThe injection amount of a single oil well in an injection interval period;
t is the injection interval period;
h is a constant with a value of 24H;
d is the daily injection amount of a single oil well;
it should be noted that the total dose injection amount of the well group in the dose injection interval period needs to satisfy the following formula, otherwise the well group cannot complete the set dose addition in the dose injection interval period:
wherein n is the number of oil wells in the well group;
DTithe injection amount of the ith oil well in the injection interval period;
q is the pump displacement of the metering plunger pump;
step S3, calculating the start-stop duration of the metering plunger pump 5 in the interval period of oil well injection, wherein the specific calculation formula is as follows:
t＝DT×Q
wherein t is the start-stop duration of the metering plunger pump in the oil well dosing interval period;
DTthe injection amount of a single oil well in an injection interval period;
q is the pump displacement of the metering plunger pump;
step S4, the remote monitoring platform 1 sends the automatically calculated start-stop time length of the metering plunger pump 5 in the oil well dosing interval period to a well site PLC2 through an oil area local area network;
step S5, the PLC program starts to execute the injection program at a whole point according to the set injection interval period, firstly the PLC controls the opening of the medicine tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of the designated oil well 8, then the medicine in the medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the designated oil well 8 through the injection pipeline through the manifold 6 and the wellhead electromagnetic valve 7 corresponding to the designated oil well, and finally when the starting time of the metering plunger pump 5 is equal to the starting and stopping time of the metering plunger pump 5 in the oil well injection interval period, the PLC controls the closing of the medicine tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of the designated oil well 8, and the injection of the designated oil well 8 is completed;
step S6, the PLC2 completes the injection of the medicaments into the other oil wells 8 one by one according to the start-stop time length of the metering plunger pump 5 in the medicament adding interval period of each oil well 8, and then stops the machine;
and step S7, repeating the steps S5 and S6 in the next injection interval period.
The principle of the program control-based cluster oil well multi-well-head polling and dropping type injection method is that daily injection dosage of an oil well is distributed into a dosing interval period, and each oil well is polled and injected in turn according to small injection dosage obtained through calculation in the injection interval period, so that oil well head polling and dropping injection of a well group in a plurality of continuous injection interval periods every day is achieved, and the defect that the effect of a medicament in a shaft cannot be continuously exerted after the medicament is fed once is overcome.
Third embodiment
The third embodiment of the invention relates to a cluster oil well multi-wellhead wheel patrol drip type injection system, which comprises a remote monitoring platform 1 and a PLC2, wherein the remote monitoring platform 1 transmits signals to a PLC2, the PLC2 transmits the signals to an injection device 9 through a power line network, the injection device 9 comprises a medicine tank 3, a medicine tank electromagnetic valve 4, a metering plunger pump 5, a manifold 6 and a wellhead electromagnetic valve 7, the medicine tank 3 is connected with a suction inlet of the metering plunger pump 5 through the medicine tank electromagnetic valve 4, and a discharge outlet of the metering plunger pump 5 is connected to a target oil well 8 through the manifold 6 and the wellhead electromagnetic valve 7;
the medicine tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 are respectively electrically connected with the PLC.
The working process or working principle of the program control-based cluster oil well multi-wellhead polling drip type injection device protected by the embodiment is as follows:
firstly, the remote monitoring platform 1 calculates the start-stop duration of the metering plunger pump 5 in the dosing interval period of the oil well according to the set parameters of the discharge capacity of the metering plunger pump 5, the dosing interval period, the daily injection amount of each oil well and the like, and sends the start-stop duration to a PLC2 in the dosing device on the well site through an oil area local area network. When the injection interval period starts, the PLC2 controls the chemical tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of a designated oil well (such as the No. 1 oil well) to be opened, then the chemical in the chemical tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the No. 1 oil well through the manifold 6 and the No. 1 wellhead electromagnetic valve 7, and finally the chemical is discharged into the oil jacket annulus of the No. 1 oil well through the injection pipeline, and finally when the starting time of the metering plunger pump 5 is equal to the starting and stopping time of the metering plunger pump 5 in the injection interval period of the No. 1 oil well, the PLC2 controls the chemical tank electromagnetic valve 4, the metering plunger pump 5 and the wellhead electromagnetic valve 7 of the No. 1 oil well to be. The PLC2 then repeats the execution procedure similar to that for well No. 1, completing injection of the agent into wells No. 2, No. 3, No. 4, etc., and then stops. And repeatedly finishing the polling injection of the No. 1 oil well to the No. 4 oil well after the next injection interval period begins.
In the above embodiment, during operation, only the parameters such as the discharge capacity of the metering plunger pump, the injection interval period, the daily injection amount of each oil well need to be set on the remote monitoring platform, and the remote monitoring platform automatically calculates the start-stop duration of the metering plunger pump in the oil well dosing interval period according to the set parameters, and sends the start-stop duration to the PLC in the injection device on the well site through the oil zone local area network. And in the interval period of the injection agent, the PLC controls the solenoid valve of the chemical tank, the metering plunger pump and the solenoid valve of the oil well to be opened in turn according to the calculated starting and stopping time length of the metering plunger pump so as to perform the polling injection of the oil wells in turn, thereby realizing the low-dose polling drip injection of the cluster well group oil wells. The invention overcomes the problems that manual injection uses more personnel, the labor intensity is high, the continuous exertion of the effect of the medicament in the shaft can not be satisfied by one-time adding of the medicament, the one-time investment in the early stage of single-well injection of the existing automatic injection device is large only by one machine, and the operation and later maintenance costs are high, the PLC is only required to simply control the electromagnetic valve and the metering plunger pump according to the program, the small-dose round-inspection drip injection of the cluster well group oil well can be realized without manual intervention, the operation is simple, the one-time investment cost in the early stage is reduced, the requirement of the continuous exertion of the effect of the medicament in the shaft of the oil well is satisfied, and the reliable operation of the production of the oil well in the.
Fourth embodiment
On the basis of the third embodiment, the remote monitoring platform 1 is a remote control terminal, the remote control terminal is programmed by using STEP7 hardware configuration software of siemens, and operates in a Windows system, the specific communication mechanism is by using Scoket TCP/IP, and the functions of the remote control terminal are mainly operation state monitoring and automatic dosing parameter setting.
The PLC2 is a Programmable Logic Controller (Programmable Logic Controller), which is a digital operation Controller with a microprocessor for automatic control, and can load control instructions into a memory at any time for storage and execution. The PLC2 adopted by the invention is Siemens S7-200PLC, has the characteristics of high speed, communication function and higher productivity in a real-time mode, and is widely applied to the field of various industrial controls at present.
It should be noted that, the STEP7 hardware configuration software of siemens and the S7-200PLC are both existing commercially available products, and belong to the technologies commonly used in the field of oil fields, and the specific structure and principle thereof do not belong to the protection scope of the present invention, and will not be described in detail herein.
Specifically, the oil well 8 is provided with a plurality of, and a well head solenoid valve 7 is correspondingly installed to the well head of each oil well 8, for example, No. 1 well head solenoid valve, No. 2 well head solenoid valve, No. 3 well head solenoid valve and so on, and so on.
It should be noted that the chemical tank electromagnetic valve 4 and the wellhead electromagnetic valve 7 are both normally closed high-pressure electromagnetic ball valves, and when the chemical injection is performed on the designated oil well 8, the wellhead electromagnetic valves 7 of the other oil wells 8 are kept closed.
The medicinal cupping 3 is one or more, and a plurality of medicinal cupping 3 connect in parallel, and every medicinal cupping 3 is connected with the sunction inlet of measurement plunger pump 5 through a medicinal cupping solenoid valve 4 respectively.
Fifth embodiment
The embodiment provides a program control-based cluster oil well multi-wellhead polling and drip-type injection method, as shown in fig. 2, an XX well group is subjected to dosing and freeze prevention, and specific parameters are as follows:
(1) 4 oil wells (No. 1 oil well, No. 2 oil well, No. 3 oil well and No. 4 oil well) under the well site;
(2) pump displacement: 4L/h;
(3) the type of the added medicine is as follows: a corrosion and scale inhibitor;
(4) adding a reagent at the well head: an oil well oil jacket annulus;
(5) the interval period of injection is as follows: 0.5 hour;
(6) daily injection amount of the oil well: the daily dosage of the agents from the No. 1 oil well to the No. 4 oil well is 4L, 4L and 2L respectively;
(7) the daily starting time of the injection is 00: 00.
The method comprises the following steps: and the displacement of the metering plunger pump, the injection interval period and the daily injection amount of each oil well are arranged on the remote control platform, wherein the unit of the injection interval period is hour, and the maximum value is not more than 24.
Step two: calculating the injection amount of each oil well in the injection interval period, namely evenly distributing the daily injection amount of the single well into the injection interval period, wherein the specific calculation formula is as follows:
wherein DT is the injection amount of the oil well in the interval period of injection agent;
t is the injection interval period;
h is a constant, with a value of 24 hours.
D is the daily injection amount of the oil well.
The injection dosage of the oil from the No. 1 well to the No. 4 well in the example is 0.0833L, 0.0833L and 0.0417L in the injection interval period through calculation.
It should be noted that the total dose of the well group during the dose interval period should satisfy the following formula, otherwise the well group cannot complete the set dose during the dose interval period.
Wherein n is the number of oil wells in the well group;
DTi is the injection amount of the ith oil well in the injection interval period;
q is the pump displacement of the metering plunger pump.
Through calculation, the total injection amount in the injection interval period of the 4 oil wells in the embodiment is 0.2916L and is less than 2L, and all oil wells can complete the set injection amount.
Step three: and calculating the start-stop time length of the metering plunger pump in the interval period of oil well agent injection.
And t is the start-stop time length of the metering plunger pump in the oil well dosing interval period.
In this example, the start-stop time of the metering plunger pump in the interval period of the injection agent is 75 seconds, 75 seconds and 37 seconds from the oil in the No. 1 well to the No. 4 well, and the total time is about 5 minutes.
Step four: the remote monitoring platform calculates the start-stop time length of the metering plunger pump in the dosing interval period of the oil well according to the set parameters of the discharge capacity of the metering plunger pump, the dosing interval period, the daily dose of each oil well and the like, and sends the start-stop time length to a PLC (programmable logic controller) in the dosing device on the well site through the oil area local area network.
Step five: when the day 00:00 starts to execute an injection program, the PLC program controls the opening of a medicine tank electromagnetic valve, a metering plunger pump and an oil well electromagnetic valve of the No. 1 oil well according to a set injection interval period, then the medicine in the medicine tank is sucked by the metering plunger pump, passes through a manifold and the No. 1 oil well electromagnetic valve and is discharged into an oil sleeve annulus of the No. 1 oil well through an injection pipeline, and finally when the starting time of the plunger pump reaches 75 seconds, the PLC controls the closing of the medicine tank electromagnetic valve, the metering plunger pump and the oil well electromagnetic valve of the No. 1 oil well to finish the injection of the No. 1 oil well.
Step six: and repeating the step five, wherein the PLC2 finishes the injection of the chemicals into the oil wells of No. 2, No. 3, No. 4 and the like according to the start-stop time length of the metering plunger pump in each oil well dosing interval period, and then stops the machine.
Step seven: 00:30 the next infusion interval cycle is started and steps five and six are repeated.
In the above embodiment, during operation, only the parameters such as the discharge capacity of the metering plunger pump, the injection interval period, the daily injection amount of each oil well need to be set on the remote monitoring platform, and the remote monitoring platform automatically calculates the start-stop duration of the metering plunger pump in the oil well dosing interval period according to the set parameters, and sends the start-stop duration to the PLC in the injection device on the well site through the oil zone local area network. And in the interval period of the injection agent, the PLC controls the solenoid valve of the chemical tank, the metering plunger pump and the solenoid valve of the oil well to be opened in turn according to the calculated starting and stopping time length of the metering plunger pump so as to perform the polling injection of the oil wells in turn, thereby realizing the low-dose polling drip injection of the cluster well group oil wells. The invention overcomes the problems that manual injection uses more personnel, the labor intensity is high, the continuous exertion of the effect of the medicament in the shaft can not be satisfied by one-time adding of the medicament, the one-time investment in the early stage of single-well injection of the existing automatic injection device is large only by one machine, and the operation and later maintenance costs are high, the PLC is only required to simply control the electromagnetic valve and the metering plunger pump according to the program, the small-dose round-inspection drip injection of the cluster well group oil well can be realized without manual intervention, the operation is simple, the one-time investment cost in the early stage is reduced, the requirement of the continuous exertion of the effect of the medicament in the shaft of the oil well is satisfied, and the reliable operation of the production of the oil well in the.
In the above, referring to fig. 1, the right side is the well head, and the wells 1, 2 and 3 … … 6 are in sequence from top to bottom.
In summary, the present invention provides a system and a method for multiple wellhead polling drip-type injection for cluster oil wells. The method comprises the steps that parameters such as the discharge capacity of a metering plunger pump, an injection interval period, daily injection amount of each oil well and the like are set on a remote monitoring platform, the remote monitoring platform automatically calculates the start-stop duration of the metering plunger pump in the oil well dosing interval period according to the set parameters, and sends the start-stop duration to a PLC (programmable logic controller) in an injection device on a well site through an oil area local area network. And in the interval period of the injection agent, the PLC controls the solenoid valve of the chemical tank, the metering plunger pump and the solenoid valve of the oil well to be opened in turn according to the calculated starting and stopping time length of the metering plunger pump so as to perform the polling injection of the oil wells in turn, thereby realizing the low-dose polling drip injection of the cluster well group oil wells. The invention overcomes the problems that manual injection uses more personnel, the labor intensity is high, the continuous exertion of the effect of the medicament in the shaft can not be satisfied by one-time adding of the medicament, the one-time investment in the early stage of single-well injection of the existing automatic injection device is large only by one machine, and the operation and later maintenance costs are high, the PLC is only required to simply control the electromagnetic valve and the metering plunger pump according to the program, the small-dose round-inspection drip injection of the cluster well group oil well can be realized without manual intervention, the operation is simple, the one-time investment cost in the early stage is reduced, the requirement of the continuous exertion of the effect of the medicament in the shaft of the oil well is satisfied, and the reliable operation of the production of the oil well in the.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A multi-wellhead polling drip-type agent injection method for a cluster oil well is characterized by comprising the following steps:
step S1, firstly, setting the displacement of the metering plunger pump, the interval period of the injection agent and the daily injection amount of each oil well on a remote control platform;
step S2, calculating the injection dosage of each oil well and the total injection dosage of the well group in the injection interval period;
step S3, calculating the start-stop duration of the metering plunger pump in the interval period of oil well agent injection;
step S4, the remote monitoring platform sends the automatically calculated start-stop time length of the metering plunger pump in the oil well dosing interval period to a well site PLC through an oil area local area network;
step S5, the PLC program starts to execute the injection program at a whole point according to the set injection interval period, the PLC controls the opening of a medicine tank electromagnetic valve, a metering plunger pump and a wellhead electromagnetic valve of a specified oil well, then the medicine in the medicine tank is sucked by the metering plunger pump and is discharged into an oil jacket annulus of the specified oil well through an injection pipeline through the wellhead electromagnetic valve corresponding to the specified oil well through a manifold, and finally when the starting time of the metering plunger pump is equal to the starting and stopping time of the metering plunger pump in the injection interval period of the oil well, the PLC controls the closing of the medicine tank electromagnetic valve, the metering plunger pump and the wellhead electromagnetic valve of the specified oil well to finish the injection of the specified oil well;
step S6, the PLC completes the injection of the chemicals into the other oil wells one by one according to the start-stop duration of the metering plunger pump in each oil well dosing interval period, and then stops the machine;
and step S7, repeating the steps S5 and S6 in the next injection interval period.
2. The method for cyclically inspecting the spot-dropping type injection agent for the multiple wellheads of the cluster oil well according to the claim 1, is characterized in that: the unit of the injection interval period in said step S1 is hours, the maximum value of which does not exceed 24.
3. The method for cyclically inspecting the spot-dropping type injection agent for the multiple wellheads of the cluster oil well according to the claim 1, is characterized in that: the step S2 is to evenly distribute the daily injection dosage of the single well into the injection interval period, and the specific calculation formula is as follows:
wherein D isTThe injection amount of a single oil well in an injection interval period;
t is the injection interval period;
h is a constant with a value of 24H;
d is the daily injection amount of a single oil well.
4. The method for cyclically inspecting the spot-dropping type injection agent for the multiple wellheads of the cluster oil well according to the claim 1, is characterized in that: the total injection dosage of the well group in the injection interval period of the step S2 should satisfy the following formula:
wherein n is the number of oil wells in the well group;
DTithe injection amount of the ith oil well in the injection interval period;
q is the pump displacement of the metering plunger pump.
5. The method for cyclically inspecting the spot-dropping type injection agent for the multiple wellheads of the cluster oil well according to the claim 1, is characterized in that: the calculation formula of the start-stop duration of the metering plunger pump in the step S3 dosage injection interval period is as follows:
t＝DT×Q
wherein t is the start-stop duration of the metering plunger pump in the oil well dosing interval period;
DTthe injection amount of a single oil well in an injection interval period;
q is the pump displacement of the metering plunger pump.
6. The method for cyclically inspecting the dotting agent of any one of claims 1-5 in a cluster oil well by using a system for cyclically inspecting the dotting agent of a cluster oil well, the system comprising a remote monitoring platform and a PLC, wherein the remote monitoring platform transmits a signal to the PLC, and the PLC transmits the signal to an agent injection device through a power line network, wherein: the injection device comprises a medicine tank, a medicine tank electromagnetic valve, a metering plunger pump, a manifold and a wellhead electromagnetic valve, wherein the medicine tank is connected with a suction inlet of the metering plunger pump through the medicine tank electromagnetic valve, and a discharge outlet of the metering plunger pump is connected to a target oil well through the manifold and the wellhead electromagnetic valve;
the medicine tank electromagnetic valve, the metering plunger pump and the wellhead electromagnetic valve are respectively and electrically connected with the PLC.
7. The system of claim 6, wherein the system comprises: the oil well is provided with a plurality of oil wells, the wellhead of each oil well is correspondingly provided with a wellhead electromagnetic valve, and when the specified oil well is injected with the agent, the wellhead electromagnetic valves of the rest oil wells are kept closed.
8. The system of claim 6, wherein the system comprises: the remote monitoring platform is a remote control terminal.
9. The system of claim 6, wherein the system comprises: the medicine tank electromagnetic valve and the wellhead electromagnetic valve are both normally closed high-pressure electromagnetic ball valves.
10. The system of claim 6, wherein the system comprises: the medicinal tank is one or more, and a plurality of medicinal tanks set up in parallel, and every medicinal tank is connected with the sunction inlet of measurement plunger pump through a medicinal tank solenoid valve respectively.
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Application publication date: 20210409 |