CN108518204B - Intermittent gas lift liquid drainage gas production control method and system - Google Patents
Intermittent gas lift liquid drainage gas production control method and system Download PDFInfo
- Publication number
- CN108518204B CN108518204B CN201810230249.XA CN201810230249A CN108518204B CN 108518204 B CN108518204 B CN 108518204B CN 201810230249 A CN201810230249 A CN 201810230249A CN 108518204 B CN108518204 B CN 108518204B
- Authority
- CN
- China
- Prior art keywords
- gas
- pressure
- gas lift
- production
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
- E21B43/123—Gas lift valves
-
- 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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses an intermittent gas lift liquid drainage and gas production control method and system, which comprises the following steps: based on the oil pressure and casing pressure change characteristics in the gas well shaft liquid accumulation process, the oil pressure and casing pressure data collected in real time are applied to automatically determine the intermittent gas lift liquid drainage gas production gas injection start time; based on the oil pressure and casing pressure change characteristics of gas well shaft accumulated liquid discharged to a well mouth by a gas lift, automatically determining the shutdown time of intermittent gas lift liquid discharge, gas production and gas injection by using the oil pressure and casing pressure data acquired in real time; the problem of current gas lift intermittent type time and gas injection time confirm by the gas production engineer according to the experience not enough that exists is solved, realize that intermittent type gas lift flowing back gas production is controlled automation, intellectuality, realize that the on-the-spot unmanned on duty of intermittent type gas lift flowing back gas production, effectively improve intermittent type gas lift flowing back gas production efficiency and benefit.
Description
Technical Field
The invention relates to the field of oil and gas field exploitation automation, in particular to an intermittent gas lift liquid drainage gas production control method and system.
Background
Intermittent gas lift is a main mode for liquid drainage and gas production of a low-yield natural gas well, high-pressure gas is intermittently injected from an annulus and enters an oil pipe through a gas lift valve or an oil pipe foot, so that liquid (generally condensate oil or formation water) accumulated in a shaft is taken out of the oil pipe, and the productivity of the gas well is recovered. The gas lift intermittent time and the gas injection time are generally determined by a gas production engineer according to experience, and the intermittent gas lift control is manually completed by a gas production operator.
Disclosure of Invention
The invention provides an intermittent gas lift liquid drainage gas production control method and system, which solve the defects caused by the fact that the existing gas lift intermittent time and gas injection time are determined by a gas production engineer according to experience, realize automation and intellectualization of intermittent gas lift liquid drainage gas production control, realize unattended operation of an intermittent gas lift liquid drainage gas production site, and effectively improve the efficiency and benefit of intermittent gas lift liquid drainage gas production.
The invention provides an intelligent optimization algorithm for intermittent gas lift liquid drainage and gas production based on characteristic rules of changes of tubing pressure and casing pressure in gas well wellbore liquid accumulation and gas lift liquid drainage processes, and further designs a set of intelligent control device system for intermittent gas lift liquid drainage and gas production. By applying the invention, the automation and the intellectualization of the control of the intermittent gas lift liquid drainage gas production can be realized, the unattended operation of the intermittent gas lift liquid drainage gas production site is realized, and the efficiency and the benefit of the intermittent gas lift liquid drainage gas production are effectively improved.
When the gas well gas production is lower than the critical liquid carrying yield, liquid slips from the gas flow and gathers and gradually gathers to the bottom of the well, the average density of the fluid in the oil pipe is gradually increased, and when accumulated liquid at the bottom of the well gathers to a certain degree, the accumulated liquid moves to the annular space to cause the liquid level of the annular space of the oil sleeve to rise. The liquid accumulation process is generally divided into three stages according to the influence degree of the liquid accumulation in the shaft on the yield of the gas well: light, moderate and severe effusion. The stage of slight liquid accumulation means that the liquid accumulation in the shaft is only generated in an oil pipe, a large amount of accumulation is not formed at the bottom of the well, and the liquid accumulation is not generated in the annular space of the oil sleeve, so that the yield of the gas well is hardly influenced, the production flow pressure at the bottom of the well is maintained stable, the sleeve pressure is maintained stable, the oil pressure is gradually reduced, and the differential pressure of the oil sleeve is gradually increased; in the medium liquid accumulation stage, the shaft accumulated liquid starts to be accumulated in a large amount at the bottom of the well, the oil sleeve annulus gradually starts to have the accumulated liquid but does not have a stable liquid level, at the moment, the yield of a gas well starts to fall, the production flow pressure at the bottom of the well starts to fall, the sleeve pressure and the oil pressure gradually fall, and the differential pressure of the oil sleeve basically stably fluctuates to a certain extent; in the heavy liquid accumulation stage, the liquid level of the oil sleeve annulus rises, the yield is accelerated to fall, the pressure of the oil pipe and the sleeve pressure are accelerated to fall, and finally the gas well stops production. Therefore, the optimal time for intermittent gas lift liquid drainage is better in the later stage of mild liquid accumulation and the early stage of moderate liquid accumulation, and on one hand, the liquid accumulation in a shaft can be prevented from influencing the yield of a gas well; on the other hand, the gas lift liquid drainage efficiency can be improved.
Gas lift liquid drainage means that high-pressure gas is injected into an annular space and enters an oil pipe through an oil pipe pin or a gas lift valve, liquid in a shaft is taken out to the ground by improving the airflow speed in the oil pipe, and meanwhile, the liquid holdup can be reduced for a well section with high local liquid holdup, so that the static pressure of a fluid column is reduced. In the gas lift liquid drainage process, as the accumulated liquid in the shaft is gradually drained to the ground, the average fluid density in the oil pipe is gradually reduced, and according to the principle of a U-shaped pipe, the pressure of the oil pipe is gradually increased under the condition that the gas injection pressure is kept unchanged; after the accumulated liquid in the shaft is completely discharged out of the shaft, the average fluid density in the oil pipe is basically kept unchanged because the shaft has no accumulated liquid, and the pressure of the oil pipe is kept stable under the condition that the gas injection pressure is kept stable according to the principle of the U-shaped pipe. Therefore, the gas lift liquid drainage stopping time can avoid invalid gas injection when the accumulated liquid in the shaft is completely drained out of the shaft.
1. The required real-time data acquisition of intermittent type gas lift flowing back gas production intelligent control mainly includes: the method comprises the steps of detecting the opening state of a pneumatic film control valve (controlling an injection high-pressure gas switch), detecting the pressure of a wellhead oil pipe (oil pressure for short), the temperature of the oil pipe, the pressure of a sleeve pipe (sleeve pressure for short), the temperature of the sleeve pipe, the pressure of gas produced by the oil pipe entering a station (return pressure for short), the pressure of gas injected into the sleeve pipe (gas injection pipeline pressure for short), and detecting the opening state of the pneumatic. The opening states of the oil pressure, the sleeve pressure and the pneumatic film control valve are used for real-time intelligent automatic control, and other data are used for production monitoring of the gas recovery well. The response time required by the detection of the opening state of the pneumatic film control valve is not less than 1 millisecond, and the detection time interval of other parameters is not less than 5 seconds.
2. An intelligent optimization algorithm for the intermittent gas lift liquid drainage gas production and gas injection opening time is shown in figure 1. During the closing period of gas injection, the gas well self-injection carries liquid production, and as the gas well gas production is lower than the critical liquid carrying yield of a shaft, the shaft liquid loading process is as follows: (1) and in the oil pipe liquid accumulation stage, the shaft liquid accumulation is continuously accumulated in the oil pipe, the production flow pressure and the casing pressure are basically stable, the yield of the gas well is kept stable, the oil pressure gradually decreases along with the increasing of the liquid accumulation in the oil pipe, and the pressure difference between the casing pressure and the oil pressure is gradually increased. (2) And in the bottom hole accumulated liquid stage, stable accumulated liquid is gradually formed at the bottom of the shaft along with the continuous deepening of the accumulated liquid in the shaft, at the moment, the production flowing pressure is gradually increased, the casing pressure is gradually reduced, the yield of the gas well is reduced, the oil pressure is continuously reduced, and the pressure difference between the casing pressure and the oil pressure is basically kept stable. (3) And in the annular accumulated liquid stage, along with further deepening of accumulated liquid in a shaft, the liquid level of the accumulated liquid in the bottom of the well continuously rises, the accumulated liquid gradually enters the annular space of the oil sleeve on the upper part of the pin, and the yield of the gas well in the stage is rapidly reduced and even stops spraying. The sleeve pressure and the oil pressure gradually decrease, and the pressure difference between the sleeve pressure and the oil pressure is basically kept stable. The optimal time period for starting the intermittent gas lift liquid drainage, gas production and gas injection is from the end period of liquid accumulation in the oil pipe to the initial period of stable liquid accumulation at the bottom of the well. Based on the characteristics of the oil pressure and the sleeve pressure change rule in the gas well shaft liquid accumulation process, the oil pressure and the sleeve pressure data collected in real time are applied, and the intermittent gas lift liquid drainage, gas production and gas injection opening time is automatically determined through an intelligent optimization algorithm of an intelligent controller. The specific algorithm is as follows:
1) calibrating given production rate Q in a gas wellgUnder the condition, the sleeve pressure reasonable pressure value P when no liquid is accumulated at the bottom of the wellc. The calibration method comprises two methods, (1) one is that the average casing pressure value of the self-spraying starting time period after the gas lift liquid drainage is obtained, and the starting time period is generally 0.5-1 hour. (2) Secondly, the flow is obtained through the analog calculation of the shaft flow, and the reasonable production allocation QgTime-corresponding production flow pressure PwfMinus the casing air column pressure Pcgs。
2) Calibrating the maximum casing pressure drop value delta P allowed by a certain accumulated liquid at the bottom of the wellzcmaxThe calibration method comprises the following steps: (1) first, the minimum allowable gas production Q is calibratedgminGenerally, the gas production Q of the gas productiong70-90% of (A). (2) Then, calculating to obtain the corresponding lowest allowable gas production Q through an inflow dynamic IPR modelgminCorresponding production flow Pwfmax. (3) Finally, the maximum casing pressure drop value Δ PzcmaxEqual to the liquid column pressure P of the liquid accumulation section of the casingclsMinus (P)wfmax-Pwf)。
3) Calibrating the maximum value delta P allowed by the differential pressure of the oil sleeve during the production of the self-spraying effusionzctmaxThe severity of accumulated liquid allowed by intermittent gas lift liquid drainage and gas production is reflected, and the larger the pressure difference of the oil sleeve is, the more serious the accumulated liquid in the oil pipe is.
4) Calibrating the difference value delta P between the sleeve pressure and the oil pressure in the production stage of the self-spraying effusionzct(t) trend of change. In the oil pipe liquid accumulation stage, the difference value between the casing pressure and the oil pressure is gradually increased to the bottom of the wellAfter stable liquid accumulation is formed, the difference value between the sleeve pressure and the oil pressure tends to be stable. Since the real-time monitoring data of the sleeve pressure and the oil pressure will fluctuate due to various causes, the differential pressure will also fluctuate. In order to eliminate the trend judgment error caused by the numerical value fluctuation of real-time monitoring, the difference value delta P between the sleeve pressure and the oil pressure obtained by real-time detection is usedzct(t) performing time-series moving average processing. The sampling period of the real-time monitoring data is set as T, n times of T is set as a unit to carry out moving average calculation, and n can be respectively 5, 10 or 20. Performing trend judgment through linear fitting, if the slope KznIncreasing indicates a faster change; the slope tends to 0, indicating a tendency to stabilize. 5) Calibrating continuous minimum T of self-spraying effusion production stagezminMaximum time Tzmax. Determining T according to comprehensive analysis of various detection indexes of gas wellzmin、Tzmax。
6) The open time judgment and accurate measurement from self-blowing to gas injection of intermittent gas lift liquid drainage gas production: respectively calculating the casing pressure drop value delta P at the current moment based on the oil pressure and the casing pressure values acquired in real time by taking the last gas lift end as a starting pointzc(t); differential pressure value delta P of oil jacketzct(t); time series oil jacket differential pressure moving average change slope kzn(t); duration of self-spray Tz(t); when any one of the following three criteria is met, the gas lift drainage is automatically started:
(1) if Tz(t)>TzmaxIf the production time of the self-spraying effusion is longer than the longest time allowed by calibration, the gas lift is required to be started for discharging the liquid;
(2) if Δ Pzc(t)>ΔPzcmaxAnd T isz(t)>TzminIf the pressure difference of the oil jacket is larger than the maximum value allowed by calibration due to the self-spraying of the accumulated liquid, starting gas lift for liquid discharge;
(3) if k iszn(t)>kzmaxAnd T isz(t)>TzminIf the change rate of the differential pressure of the oil jacket is obviously greater than the maximum value allowed by calibration, starting gas lift liquid drainage;
3. an intelligent optimization algorithm for the shutdown time of intermittent gas lift liquid drainage, gas production and gas injection is shown in figure 2. In the gas lift liquid drainage process, firstly, high-pressure gas is injected to replace accumulated liquid in the annular space of the oil sleeve into an oil pipe through a pin (or a gas lift valve), and the differential pressure of the oil sleeve is gradually increased; then, injecting high-pressure gas to replace the accumulated liquid in the oil pipe to a wellhead for discharging, wherein the differential pressure of the oil sleeve is kept stable; then, as the liquid in the oil pipe is gradually discharged out of the shaft, the liquid in the oil pipe is less and less, and the differential pressure of the oil sleeve is gradually reduced; and finally, the pressure difference of the oil jacket is kept stable along with the discharge of all accumulated liquid from the shaft. Based on the oil pressure and casing pressure change rule characteristics of gas well shaft accumulated liquid discharged to a well mouth by a gas lift, the oil pressure and casing pressure data collected in real time are applied, and the intermittent gas lift liquid discharge gas production gas injection shut-down time is automatically determined through an intelligent optimization algorithm of an intelligent controller. The specific algorithm is as follows:
1) calibrating the minimum oil jacket differential pressure value delta P of gas lift liquid completely lifting wellbore liquidglctmin. The value can be obtained through gas lift shaft flow simulation calculation, and according to the principle of a U-shaped pipe, under the condition that a shaft has no accumulated liquid, the oil sleeve differential pressure value delta PctminEqual to the pressure P of the gas column in the annuluscgs+ annular gas injection friction resistance Pcfg+ pin gas lift valve (if any) throttling pressure difference Pctp+ oil pipe gas friction resistance Ptgs-pressure P of gas column in oil pipetfg。
2) Calibrating a difference value delta P between sleeve pressure and oil pressure during gas lift liquid drainageglct(t) trend of change. In order to eliminate the trend judgment error caused by the numerical value fluctuation of real-time monitoring, the difference value delta P between the sleeve pressure and the oil pressure obtained by real-time detection is usedglct(t) performing time-series moving average processing. Setting the sampling period of the real-time monitoring data as T, and performing moving average calculation by taking n times of T as a unit, wherein n is3Values of 5, 10 or 20 are generally desirable. Trend determination by linear fitting, kglnIf the slope is negative, the judgment result is that the slope is reduced; if k isglnIf the value is approximately 0, the value is determined to be stable.
3) And calibrating the minimum gas injection duration and the maximum gas injection duration of gas lift liquid discharge and gas production. Determining the minimum and maximum allowable gas injection duration T of gas lift liquid drainage and gas production according to the comprehensive analysis of various detection indexes of the gas wellglmin、Tglmax。
4) And (3) determining and accurately measuring the intermittent gas lift liquid drainage gas production gas injection duration: starting from the gas lift starting point at this time based onRespectively calculating the differential pressure value delta P of the oil jacket at the current moment according to the oil pressure and the jacket pressure values acquired in real timeglct(t); time series oil jacket differential pressure moving average change slope kgln(t); duration of gas lift Tgl(t); if any one of the following three criteria is established, the gas lift drainage needs to be automatically closed, and the gas well is switched to the self-blowout production stage:
(1) if Tgl(t)>TglmaxWhen the gas lift liquid drainage time is longer than the maximum time allowed by calibration, the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the automatic switching is performed to the self-spraying production stage;
(2) if Pglct(t)<ΔPglctminAnd T isgl(t)>TglminAnd when the differential pressure of the oil jacket is reduced to a calibrated allowable value, the gas lift liquid drainage is finished, the gas lift liquid drainage needs to be closed at the moment, and the self-spraying production stage is automatically switched.
(3) If k isgln(t)<kglminAnd T isgl(t)>TglminThe change rate of the differential pressure of the oil sleeve tends to be stable, which indicates that the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the automatic switching is carried out to the self-spraying production stage;
4. intermittent type gas lift flowing back intelligence control system constitutes, as fig. 3, (1) real-time detection perception unit: the device consists of an oil pipe pressure sensor and a sleeve pressure sensor; (2) an automatic execution unit: the controllable pneumatic film control valve is composed of a controllable film control valve and accessories thereof, a pneumatic film control valve is generally selected, a control gas source of the pneumatic film control valve directly takes gas from the annular space of a wellhead oil sleeve through a collecting connector, and the pneumatic film control valve is provided with opening and closing power gas after passing through a pressure reducing valve, a filter and an electromagnetic valve. The intelligent controller outputs control signals to the electromagnetic valve. (3) The intelligent controller is a core unit for intermittent gas lift liquid drainage and gas production, and is internally provided with a real-time acquisition data interface, an automatic actuator interface, a field control panel interface, a data remote transmission interface, an intelligent optimization calculator and other accessories. (4) The field control panel is used for providing system display and control data input; (5) and the power supply system is used for supplying power to the intelligent controller, the perception sensor, the automatic actuator and the field control panel.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the automatic control system realizes automation and intellectualization of intermittent gas lift liquid drainage gas production control, realizes unattended operation of an intermittent gas lift liquid drainage gas production site, and effectively improves efficiency and benefit of intermittent gas lift liquid drainage gas production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic diagram of the working principle of intelligent control in the spontaneous effusion production phase of an intermittent gas lift drainage gas production well in the application;
FIG. 2 is a schematic diagram of the working principle of intelligent control in the gas lift drainage production phase of an intermittent gas lift drainage gas recovery well in the application;
FIG. 3 is a schematic structural diagram of an intelligent control system of an intermittent gas lift liquid drainage gas production well in the application.
Detailed Description
Intermittent gas lift is a main mode for liquid drainage and gas production of a low-yield natural gas well, high-pressure gas is intermittently injected from an annulus and enters an oil pipe through a gas lift valve or an oil pipe foot, so that liquid (generally condensate oil or formation water) accumulated in a shaft is taken out of the oil pipe, and the productivity of the gas well is recovered. The current gas lift intermittent time and gas injection time are generally determined by gas production engineers according to experience, and the intermittent gas lift control is manually completed by gas production operators. The invention provides an intelligent optimization method for intermittent gas lift liquid drainage and gas production based on characteristic rules of changes of tubing pressure and casing pressure in gas well wellbore liquid accumulation and gas lift liquid drainage processes, and further designs a set of intelligent control device system for intermittent gas lift liquid drainage and gas production. By applying the invention, the automation and the intellectualization of the control of the intermittent gas lift liquid drainage gas production can be realized, the unattended operation of the intermittent gas lift liquid drainage gas production site is realized, and the efficiency and the benefit of the intermittent gas lift liquid drainage gas production are effectively improved.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
The invention provides a set of intelligent algorithm for judging the liquid accumulation degree during the flowing process of the intermittent gas lift liquid drainage gas production well based on the real-time acquisition of oil pressure and casing pressure data, and the algorithm is embedded into an intelligent controller, so that the intelligent and automatic starting of the gas lift liquid drainage control of the intermittent gas lift liquid drainage gas production can be realized. By applying the algorithm, the accumulated liquid production can be carried out by applying the self energy of the gas well to the maximum extent, the production allocation requirement can be met, and the injected gas quantity can be reduced, so that the intermittent gas lift liquid drainage and gas production efficiency and benefit are improved.
According to the first accumulated liquid degree judging method provided by the invention, the time sequence change characteristics of the difference between the oil pressure and the casing pressure of the accumulated liquid in the shaft at different stages are utilized, the intelligent judgment is carried out by utilizing a time scale moving average slope calculating method, and the uncertain influence of real-time monitoring fluctuation on the trend judgment can be eliminated. The difference value delta P between the sleeve pressure and the oil pressure obtained by real-time detectionzct(t) performing time-series moving average processing. The sampling period of the real-time monitoring data is set to be T, the moving average calculation is carried out by taking n times of T as a unit, and n can be 5, 10 or 20, and the specific situation is determined according to experience. Performing trend judgment through linear fitting, and if the slope K of the fitting isznIf the value is larger, the change is judged to be obvious; if the value is close to 0, the value is determined to be stable.
The second method for judging the liquid accumulation degree provided by the invention utilizes the maximum difference value between the oil pressure and the sleeve pressure to judge delta Pzctmax. The maximum differential pressure allowed by the oil jacket is obtained by tracking and comprehensively analyzing the production process of the gas well accumulated liquid by a gas production engineer. If Pzct(t)>ΔPzctmaxIf so, the accumulated liquid is serious and needs to be discharged by gas lift.
The third method for judging the effusion degree provided by the invention utilizes the casing pressure drop value in the effusion stage of the shaftAnd (6) line judgment. Obtaining the maximum casing pressure drop value delta P allowed in the production process of the gas well self-spraying effusion by flow simulation calculation in the production process of the background gas well effusion and combined with empirical estimationzcmax. Firstly, calculating, and reasonably allocating production Q under the condition of no effusiongCorresponding sleeve pressure value Pc1. Then calculating the lowest gas production rate Q of the allowed effusion productiongminHour (generally, the gas production quantity Q of the gas productiong70-90%, the specific value, determined empirically) corresponds to Pc2. Maximum casing pressure drop value delta Pzcmax＝Pc1-Pc2. If Δ Pzc(t)>ΔPcmaxIf so, the accumulated liquid is serious and needs to be discharged by gas lift.
The accumulated liquid degree judging method is obtained by tracking and analyzing the history of the gas well by a gas production engineer, and the minimum and maximum production time T allowed by accumulated liquid productionzmin、Tzmax. If Tz(t)<TzminIndicating that gas well liquid accumulation is not severe; t isz(t)>TzmaxIndicating that gas wells are heavily flooded.
The invention provides a method for determining and accurately measuring the starting time from self-blowing to gas injection of intermittent gas lift liquid drainage gas production: respectively calculating the casing pressure drop value delta P at the current moment based on the oil pressure and the casing pressure values acquired in real time by taking the last gas lift end as a starting pointzc(t); differential pressure value delta P of oil jacketzct(t); time series oil jacket differential pressure moving average change slope kzn(t); duration of self-spray Tz(t); when any one of the following three criteria is met, the gas lift drainage is automatically started:
(1) if Tz(t)>TzmaxIf the production time of the self-spraying effusion is longer than the longest time allowed by calibration, the gas lift is required to be started for discharging the liquid;
(2) if Δ Pzc(t)>ΔPzcmaxAnd T isz(t)>TzminIf the pressure difference of the oil jacket is larger than the maximum value allowed by calibration due to the self-spraying of the accumulated liquid, starting gas lift for liquid discharge;
(3) if k iszn(t)>kzmaxAnd T isz(t)>TzminRate of change of differential pressure of oil jacketIf the maximum value is obviously larger than the maximum value allowed by calibration, gas lift liquid drainage needs to be started;
the invention provides a set of intelligent judgment intermittent gas lift liquid drainage completion method for a gas lift liquid drainage gas recovery well based on real-time acquisition of oil pressure and casing pressure data, and the method is embedded into an intelligent controller, so that the intelligent intermittent gas lift liquid drainage gas recovery and automatic gas lift gas injection closing control can be realized. By applying the algorithm, the gas injection time can be accurately controlled, the waste of the gas injection amount is avoided, and the efficiency and the benefit of intermittent gas lift liquid drainage and gas production are improved.
According to the first judgment method for completing the gas lift liquid drainage, provided by the invention, the time sequence change characteristics of the difference value between the oil pressure and the casing pressure of the shaft liquid drainage at different stages are utilized, the intelligent judgment is carried out by utilizing a moving average slope calculation method with different time scales, and the uncertainty influence of real-time monitoring fluctuation on the trend judgment can be eliminated. The difference value delta P between the sleeve pressure and the oil pressure obtained by real-time detectionglct(t) performing time-series moving average processing. The sampling period of the real-time monitoring data is set to be T, the moving average calculation is carried out by taking n times of T as a unit, and n can be 5, 10 or 20, and the specific situation is determined according to experience. Performing trend judgment through linear fitting, and if the slope k is fittedglnIf the change is larger, the change is judged to be obvious; if k isglnWhen the value approaches 0, the value is judged to be stable.
The second method for judging the completion of gas lift liquid drainage provided by the invention is to judge delta P by using the minimum difference between the oil pressure and the sleeve pressureglctmin. The minimum pressure difference allowed by the oil jacket is obtained by tracking and comprehensively analyzing the production process of the gas well drainage by a gas production engineer. If Pglct(t)<ΔPglctminIf the accumulated liquid is completely discharged, the production of the self-spraying accumulated liquid can be switched.
The gas lift liquid drainage completion judgment method III provided by the invention is obtained by a gas production engineer according to historical tracking analysis of gas lift liquid drainage of a gas well, and the gas lift liquid drainage gas production is minimum, and the maximum allowable gas injection duration T isglmin、Tglmax. If Tgl(t)<TglminIndicating that the gas lift liquid drainage is not finished; t isgl(t)>TglmaxIndicating that gas well gas lift drainage has been completed.
The invention provides a determination and standard measurement for intermittent gas lift liquid drainage gas production gas injection duration: respectively calculating the oil jacket differential pressure value delta P at the current moment based on the oil pressure and the jacket pressure value acquired in real time by taking the gas lift starting point as a starting pointglct(t); time series oil jacket differential pressure moving average change slope kgln(t); duration of gas lift Tgl(t); if any one of the following three criteria is established, the gas lift drainage needs to be automatically closed, and the gas well is switched to the self-blowout production stage:
(1) if Tgl(t)>TglmaxWhen the gas lift liquid drainage time is longer than the maximum time allowed by calibration, the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the automatic switching is performed to the self-spraying production stage;
(2) if Pglct(t)<ΔPglctminAnd T isgl(t)>TglminAnd when the differential pressure of the oil jacket is reduced to a calibrated allowable value, the gas lift liquid drainage is finished, the gas lift liquid drainage needs to be closed at the moment, and the self-spraying production stage is automatically switched.
(3) If k isgln(t)<kglminAnd T isgl(t)>TglminThe change rate of the differential pressure of the oil sleeve tends to be stable, which indicates that the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the automatic switching is carried out to the self-spraying production stage;
based on the intelligent judgment algorithm for liquid accumulation and liquid drainage in the automatic liquid accumulation spraying production and gas lifting liquid drainage production stages in the intermittent gas lift liquid drainage gas production process, the invention provides a set of practical intelligent control system device for intermittent gas lift liquid drainage gas production, which comprises 7 parts:
1, detecting a sensing unit in real time: in addition to the online detection of oil pipe pressure and casing pressure required by intelligent control, the online real-time detection of parameters such as gas injection system pressure and temperature, ground production pipeline back pressure and temperature, gas injection quantity metering, gas production quantity metering, liquid (oil and water) metering and the like is required to be added for realizing the comprehensive monitoring of the gas well production condition.
2, an automatic execution unit: the pneumatic membrane control valve is generally selected, a control gas source of the pneumatic membrane control valve directly takes gas from the annular space of a wellhead oil sleeve through a collecting connector, and a power gas source is provided for the pneumatic membrane control valve after passing through a pressure reducing valve, a filter and an electromagnetic valve. The intelligent controller outputs control signals to the electromagnetic valve.
The intelligent controller is a core unit for intermittent gas lift liquid drainage and gas production, and is internally provided with a real-time acquisition data interface, an automatic actuator interface, a field control panel interface, a data remote transmission interface, an intelligent optimization calculator and other accessories.
4 field control panel for providing system display and control data input;
and 5, the data remote transmission communication module realizes on-line monitoring and control information uploading and remote model parameter and control parameter returning, and the communication mode can be wireless GPRS and WIFI or wired optical cables, communication lines and the like.
6, a remote monitoring system for monitoring the production condition of intermittent gas lift liquid drainage and gas production, inputting parameters of an intelligent control model and inputting remote control data;
and 7, the power supply system provides power for field devices such as an intelligent controller, a sensing sensor, an automatic actuator, a data remote transmission communication module, a field control panel and the like, and the power supply source can be a ground power line, a storage battery, solar energy and the like.
The following is a partially consistent description in this application:
Qgcalibration of given production allocation in a gas well, m3/d；PcThe casing pressure reasonable pressure value is MPa when no liquid exists at the bottom of the well; delta PzcmaxCalibrating the maximum casing pressure drop value, MPa, allowed by certain accumulated liquid at the bottom of the well; delta PzctmaxCalibrating the maximum value, MPa, allowed by the differential pressure of the oil jacket during the production of the self-spraying drainage liquid; delta Pzc(t), monitoring the differential pressure monitoring value of the oil jacket in the production period of the self-spraying drainage liquid, namely MPa; k is a radical ofzn(t), obtaining the oil jacket pressure difference delta P in the production period of the self-spraying drainage liquid by fitting calculationzc(t) moving average change trend slope, MPa/d; k is a radical ofzmaxCalibrating the limit value of the moving average change slope of the differential pressure of the oil sleeve during the self-injection period, namely MPa/d; t iszmin、TzmaxCalibrating the shortest and longest duration of the self-spraying, d; delta Pglct(t), monitoring the differential pressure monitoring value of the oil jacket in the gas lift liquid drainage period, namely MPa; delta PglctminCalibrating the minimum oil jacket differential pressure value (MPa) after the gas lift drainage completely lifts the accumulated liquid in the shaft; k is a radical ofgln(t), the gradient of the moving average change trend of the differential pressure of the oil jacket during the gas lift liquid drainage period, namely MPa/d; k is a radical ofglminCalibrating a minimum defining value of the slope of the moving average change trend of the differential pressure of the oil sleeve during the liquid drainage period of the gas lift, namely MPa/d; t isglmin、TglmaxCalibrating the minimum allowable gas injection duration minimum and maximum values d of gas lift liquid drainage and gas production; pwfRational production allocation QgCorresponding to the production flow pressure, MPa; pcgsRational production allocation QgThe pressure of the air column of the corresponding sleeve is MPa; qgminCalibration of minimum allowable gas production, m3/d；PwfmaxAllowing the production flow pressure corresponding to the lowest gas production; pclsAllowing the liquid column pressure of the accumulated liquid in the casing to be MPa; pcfgWhen in gas lift, the gas is injected into the annulus to cause friction resistance of MPa; pctpThe throttling pressure difference of a pin gas lift valve is MPa during gas lift; ptgsGas friction resistance in the oil pipe during gas lifting, MPa; ptfgAnd the pressure of the gas column in the oil pipe during gas lifting.
The structure and the principle of the intermittent gas lift liquid drainage and gas production intelligent control system provided by the invention are shown in the figure 1, the figure 2 and the figure 3
In the stage of producing the self-spraying effusion, the oil pressure and the sleeve pressure are continuously monitored, the judgment parameter of the self-spraying effusion is automatically calculated based on the model parameter provided by the background, the intermittent gas lift liquid drainage gas production gas injection opening time comprehensive judgment accurate measurement provided by the invention is applied, whether the stage needs to be switched to the gas lift liquid drainage production stage is intelligently determined, if yes, a gas lift liquid drainage opening instruction is output, and the pneumatic film control valve is opened through the electromagnetic valve so as to realize the gas lift liquid drainage production, otherwise, the self-spraying effusion production is continuously maintained.
In the gas lift liquid drainage production stage, oil pressure and casing pressure are continuously monitored, gas lift liquid drainage completion judgment parameters are automatically calculated based on model parameters provided by a background, the intermittent gas lift liquid drainage gas production gas injection duration judgment accurate measurement provided by the invention is applied, whether the production stage needs to be switched to the self-spraying liquid drainage production stage is intelligently determined, if yes, a gas lift liquid drainage closing instruction is output, a pneumatic film control valve is closed through an electromagnetic valve, so that the gas lift is closed, and otherwise, the gas lift liquid drainage production is continuously maintained.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. An intermittent gas lift liquid drainage and gas production control method is characterized by comprising the following steps:
based on the oil pressure and casing pressure change characteristics in the gas well shaft liquid accumulation process, the opening time of intermittent gas lift liquid drainage, gas production and gas injection is automatically determined by using the oil pressure and casing pressure data acquired in real time;
based on the oil pressure and casing pressure change characteristics of gas well shaft accumulated liquid discharged to a well mouth by a gas lift, the production time of stopping intermittent gas lift liquid discharge, gas production and gas injection and converting into self-blowing is automatically determined by using the oil pressure and casing pressure data collected in real time;
the automatic opening time who confirms intermittent type gas lift flowing back gas production gas injection specifically includes:
calibrating given production rate Q in a gas wellgUnder the condition, the sleeve pressure reasonable pressure value P when no liquid is accumulated at the bottom of the wellc(ii) a Calibrating the maximum casing pressure drop value delta P allowed by a certain accumulated liquid at the bottom of the wellzcmax(ii) a Calibrating the maximum value delta P allowed by the differential pressure of the oil jacketzctmax(ii) a The differential pressure delta P of the oil sleeve is calculated by adopting a moving average methodzc(t) slope k of the variation tendencyzn(t) calibrating the slope limit value k of the change allowed by the accumulated liquidzmax(ii) a Calibrating the minimum duration T of gas lift liquid drainage and gas production self-blowingzminMaximum time Tzmax；
The open time judgment and accurate measurement from self-blowing to gas injection of intermittent gas lift liquid drainage gas production:respectively calculating the casing pressure drop value delta P at the current moment based on the oil pressure and the casing pressure values acquired in real time by taking the last gas lift end as a starting pointzc(t); differential pressure value delta P of oil jacketzct(t); time series oil jacket differential pressure moving average change slope kzn(t); duration of self-spray Tz(t); when any one of the following three criteria is met, the gas lift drainage is automatically started:
1) if Tz(t)>TzmaxIf the production time of the self-spraying effusion is longer than the longest time allowed by calibration, the gas lift is required to be started for discharging the liquid;
2) if Δ Pzc(t)>ΔPzcmaxAnd T isz(t)>TzminIf the pressure difference of the oil jacket is larger than the maximum value allowed by calibration due to the self-spraying of the accumulated liquid, starting gas lift for liquid discharge;
3) if k iszn(t)>kzmaxAnd T isz(t)>TzminIf the change rate of the differential pressure of the oil sleeve is greater than the maximum value allowed by calibration, starting gas lift liquid drainage;
the method for automatically determining the production time of stopping intermittent gas lift liquid drainage, gas production and gas injection and converting the gas production and gas injection into self-blowing specifically comprises the following steps:
calibrating the minimum oil jacket differential pressure value delta P after the gas lift liquid completely lifts the accumulated liquid in the shaftglctmin(ii) a Calculating the difference value delta P between the casing pressure and the oil pressure by adopting a moving average methodglct(t) tendency of variation kgln(t), calibrating the minimum change slope k of the differential pressure of the oil jacket after the gas lift liquid completely lifts the liquid accumulation in the shaftglmin(ii) a Calibrating minimum allowable gas injection duration T for gas lift liquid drainage and gas productionglminMaximum time Tglmax；
And (3) determining and accurately measuring the intermittent gas lift liquid drainage gas production gas injection duration: respectively calculating the oil jacket differential pressure value delta P at the current moment based on the oil pressure and the jacket pressure value acquired in real time by taking the gas lift starting point as a starting pointglct(t); time series oil jacket differential pressure moving average change slope kgln(t); duration of gas lift Tgl(t); if any one of the following three criteria is established, the gas lift drainage needs to be automatically closed, and the gas well is switched to the self-blowout production stage:
1) if Tgl(t)>TglmaxWhen the gas lift liquid drainage time is longer than the maximum time allowed by calibration, the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the automatic switching is performed to the self-spraying production stage;
2) if Pglct(t)<ΔPglctminAnd T isgl(t)>TglminWhen the differential pressure of the oil jacket is reduced to a value allowed by calibration, the gas lift liquid drainage is finished, and at the moment, the gas lift liquid drainage needs to be closed, and the self-spraying production stage is automatically switched;
3) if k isgln(t)<kglminAnd T isgl(t)>TglminAnd when the gas lift liquid drainage is finished, the gas lift liquid drainage needs to be closed, and the self-spraying production stage is automatically switched.
2. The intermittent gas lift liquid drainage gas production control method of claim 1, characterized in that a given production allocation yield Q in a gas well is calibratedgUnder the condition, the sleeve pressure reasonable pressure value P when no liquid is accumulated at the bottom of the wellcThere are two calibration methods, the first one is: average sleeve pressure value of the period of starting self-spraying after gas lift liquid drainage; and the second method comprises the following steps: obtained by wellbore flow simulation calculation and reasonably allocated with production QgTime-corresponding production flow pressure PwfMinus the casing air column pressure Pcgs。
3. An intermittent gas lift liquid drainage gas production control method as claimed in claim 1, wherein the maximum casing pressure drop value Δ P allowed by a certain accumulated liquid at the bottom of the well is calibratedzcmaxThe calibration method comprises the following steps: first, the minimum allowable gas production Q is calibratedgmin(ii) a Then, calculating to obtain the corresponding lowest allowable gas production Q through an inflow dynamic IPR modelgminCorresponding production flow pressure Pwfmax(ii) a Finally, the maximum casing pressure drop value Δ PzcmaxEqual to the liquid column pressure P of the liquid accumulation section of the casingclsMinus (P)wfmax-Pwf)。
4. An intermittent gas lift liquid drainage gas production control method as claimed in claim 1, characterized in that the difference value Δ P between the nominal jacket pressure and the oil pressure is calibratedzct(t) trend of change, will examine in real timeThe difference value delta P between the sleeve pressure and the oil pressure is obtained through measurementzct(T) carrying out time series moving average processing, setting the sampling period of the real-time monitoring data as T, carrying out moving average calculation by taking n times of T as a unit, and carrying out trend judgment by linear fitting, wherein the value of n is 5 or 10.
5. An intermittent gas lift liquid recovery control method as claimed in claim 1 wherein the minimum oil jacket differential pressure value Δ Ρ is calibrated for gas lift liquid fully extracted from wellbore liquidglctminThe oil jacket differential pressure value delta P is obtained by gas lift shaft flow simulation calculation under the condition that no liquid exists in the shaftctminEqual to the pressure P of the gas column in the annuluscgs+ annular gas injection friction resistance Pcfg+ pin gas lift valve throttle pressure difference Pctp+ oil pipe gas friction resistance Ptgs-pressure P of gas column in oil pipetfg。
6. An intermittent gas lift liquid drainage gas production control method as claimed in claim 1, characterized in that the difference value Δ P between the nominal jacket pressure and the oil pressure is calibratedglct(t) trend of change, difference value delta P between sleeve pressure and oil pressure obtained by real-time detectionglct(T) carrying out time series moving average processing, setting the sampling period of the real-time monitoring data as T, carrying out moving average calculation by taking n times of T as a unit, and carrying out trend judgment by linear fitting, wherein the value of n is 5 or 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810230249.XA CN108518204B (en) | 2018-03-20 | 2018-03-20 | Intermittent gas lift liquid drainage gas production control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810230249.XA CN108518204B (en) | 2018-03-20 | 2018-03-20 | Intermittent gas lift liquid drainage gas production control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108518204A CN108518204A (en) | 2018-09-11 |
| CN108518204B true CN108518204B (en) | 2020-01-21 |
Family
ID=63432900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810230249.XA Active CN108518204B (en) | 2018-03-20 | 2018-03-20 | Intermittent gas lift liquid drainage gas production control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108518204B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209305B (en) * | 2018-11-13 | 2023-10-13 | 中国石油化工股份有限公司 | Intelligent plunger drainage and production device for gas well and construction method |
| CN110318715B (en) * | 2019-07-03 | 2021-07-13 | 四川轻化工大学 | Plunger-assisted intermittent gas lift liquid drainage and gas production control system and control method |
| CN110593820A (en) * | 2019-08-07 | 2019-12-20 | 中国石油天然气股份有限公司 | Liquid drainage and gas production device and gas well liquid drainage method |
| CN111472733B (en) * | 2020-06-03 | 2022-07-05 | 中测测控(西安)研究院有限公司 | Intelligent intermittent drainage gas production system and control method thereof |
| CN111832232A (en) * | 2020-07-20 | 2020-10-27 | 森诺科技有限公司 | Technical method for diagnosing and identifying accumulated liquid in pipeline |
| CN113027382B (en) * | 2020-08-18 | 2023-02-10 | 陕西中良智能科技有限公司 | Machine learning device, intermittent gas well switching intelligent control system and control method |
| CN114412427B (en) * | 2020-10-12 | 2023-11-14 | 北京星油科技有限公司 | Gas lift and production integrated oil gas exploitation system |
| CN112459748A (en) * | 2020-11-05 | 2021-03-09 | 中国石油天然气股份有限公司 | Single-point high-pressure gas lift drainage and gas increase process system and method |
| CN114673473A (en) * | 2022-04-22 | 2022-06-28 | 托普威尔石油技术股份公司 | Plunger gas lift control system and control method thereof |
| CN115492573B (en) * | 2022-11-21 | 2023-03-17 | 西南石油大学 | Dynamic determination method for stratum inflow of plunger gas lift well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5871048A (en) * | 1997-03-26 | 1999-02-16 | Chevron U.S.A. Inc. | Determining an optimum gas injection rate for a gas-lift well |
| CN104806229A (en) * | 2015-04-01 | 2015-07-29 | 西南石油大学 | Plunger gas-lift drainage/gas production logging system and control method thereof |
| CN105089537A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | Simple plunger piston device of gas well mouth and gas well gas production method |
| CN105888608A (en) * | 2014-12-05 | 2016-08-24 | 西安金立石油科技有限公司 | Intelligent control plunger gas lift water drainage and gas recovery system and realizing method thereof |
| CN206928940U (en) * | 2017-07-14 | 2018-01-26 | 中国石油化工股份有限公司 | A kind of downhole intelligent controls plunger airlift unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050149264A1 (en) * | 2003-12-30 | 2005-07-07 | Schlumberger Technology Corporation | System and Method to Interpret Distributed Temperature Sensor Data and to Determine a Flow Rate in a Well |
-
2018
- 2018-03-20 CN CN201810230249.XA patent/CN108518204B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5871048A (en) * | 1997-03-26 | 1999-02-16 | Chevron U.S.A. Inc. | Determining an optimum gas injection rate for a gas-lift well |
| CN105089537A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | Simple plunger piston device of gas well mouth and gas well gas production method |
| CN105888608A (en) * | 2014-12-05 | 2016-08-24 | 西安金立石油科技有限公司 | Intelligent control plunger gas lift water drainage and gas recovery system and realizing method thereof |
| CN104806229A (en) * | 2015-04-01 | 2015-07-29 | 西南石油大学 | Plunger gas-lift drainage/gas production logging system and control method thereof |
| CN206928940U (en) * | 2017-07-14 | 2018-01-26 | 中国石油化工股份有限公司 | A kind of downhole intelligent controls plunger airlift unit |
Non-Patent Citations (1)
| Title |
|---|
| 柱塞气举排水采气工艺关键技术研究;田宝;《全国优秀硕士学位论文全文数据库工程科技Ⅰ辑》;20150815;第32-48、64-86页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108518204A (en) | 2018-09-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108518204B (en) | Intermittent gas lift liquid drainage gas production control method and system | |
| CN110318715B (en) | Plunger-assisted intermittent gas lift liquid drainage and gas production control system and control method | |
| CN112943181B (en) | Intelligent gas well valve adjusting system | |
| CN106285572B (en) | Control device and its control method are taken out between a kind of pumping unit intelligence | |
| CN104196506B (en) | Injection and production parameter joint debugging method, device and system for SAGD single well set | |
| US10876383B2 (en) | Method and system for maximizing production of a well with a gas assisted plunger lift | |
| CN104100241B (en) | A kind of definite hyposmosis oil well is taken out the method for system rationally | |
| KR101902472B1 (en) | Big data-based artificial intelligent valve automatic control method and program stored in a recording medium for executing it | |
| CN203990332U (en) | The on-line automatic control device of a kind of concentration of emulsion used | |
| CN103488132A (en) | Automatic optimized parameter-tuning method based on indicator diagram | |
| CN106869863A (en) | A kind of gas well Life cycle engineer testing system | |
| CN114992106A (en) | Pump station unit running state analysis system based on digital twins | |
| CN206495665U (en) | A kind of natural gas well engineer testing system | |
| US20180179869A1 (en) | Apparatus and methods for operating gas lift wells | |
| CN207406582U (en) | A kind of hydraulic device of intelligence electric-liquid type pressure test machine | |
| CN110513063B (en) | Pressure-controlled drilling system and control method thereof | |
| CN111852896A (en) | Water quantity-water level servo control pressure reduction well based on information feedback and dynamic backflow | |
| CN205172564U (en) | Drilling fluid leakage position survey of fire hole device | |
| CN107882101B (en) | Excavator main pump overflow recognition methods | |
| CN106439199A (en) | Monitoring method for control valve failure based on DCS data | |
| CN102393631B (en) | Lubricating oil temperature control system based on fuzzy control | |
| CN112943179B (en) | Plunger gas lift production system optimization control method | |
| CN108549311A (en) | Workover treatment automatic data collection analysis system and control method | |
| CN209494552U (en) | A kind of well plunger control system | |
| CN203201534U (en) | Oil field heating power well flushing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |