CN114427387B - Calculation method of gas well plunger gas lift process parameters - Google Patents
Calculation method of gas well plunger gas lift process parameters Download PDFInfo
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- CN114427387B CN114427387B CN202011026932.5A CN202011026932A CN114427387B CN 114427387 B CN114427387 B CN 114427387B CN 202011026932 A CN202011026932 A CN 202011026932A CN 114427387 B CN114427387 B CN 114427387B
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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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
- E21B47/00—Survey of 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention relates to the technical field of oil and gas field gas production processes, in particular to a calculation method of gas well plunger gas lift process parameters, which mainly comprises the steps of calculating plunger gas lift single liquid carrying amount, calculating plunger gas lift minimum casing pressure, calculating gas minimum channeling flow in the plunger lifting process, calculating single plunger gas lift gas demand and calculating casing pressure required to be achieved during the well closing in a single plunger gas lift period, so as to determine the well closing duration in the single plunger gas lift period; the method introduces the channeling factor in the calculation process, has reliable principle and simple operation, can provide basis for optimizing the plunger gas lift liquid discharge process parameters of the gas well, greatly improves the calculation accuracy of the plunger gas lift process parameters, improves the production efficiency, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a calculation method of gas well plunger gas lift process parameters.
Background
During the production process, the gas production well produces more or less amounts of formation water along with the production of natural gas. When the production of a gas production well is low, the gas flow is insufficient to carry formation water to the surface, so that the formation water is accumulated at the bottom of the well, the gas production is reduced, and the gas production well cannot produce in severe cases. Therefore, during the production of the gas production well, the bottom-hole effusion needs to be removed in time so as to ensure the normal production of the gas production well.
The plunger gas lift process is a common gas well drainage means, and utilizes a plunger as a mechanical interface between gas and liquid, and lifts bottom hole liquid accumulation to a wellhead under the drive of the energy of the gas well itself. Each plunger gas lift period is divided into two stages of well closing energy storage and well opening liquid discharge production, and when a gas well is closed, the plunger falls onto a clamp below the liquid level of an oil pipe from a wellhead; after the well is opened, the high-pressure air in the oil sleeve annulus pushes the plunger and the liquid slug on the upper part of the plunger to move to the well head, so that the accumulated liquid at the well bottom is discharged. For a plunger gas lift well, effective liquid discharge of plunger gas lift can be realized by determining a reasonable plunger gas lift period and well closing pressure accumulation time, so that two parameters of the plunger gas lift period and the well closing time are determined through calculation of plunger gas lift process parameters.
A small gap exists between the plunger and the inner wall of the oil pipe, and a large number of experiments and numerical simulation researches show that in the process of lifting the plunger upwards, gas can continuously flow upwards through the gap between the plunger and the inner wall of the oil pipe, so that a part of energy of a gas well in the process of lifting the plunger cannot be effectively used for lifting the plunger and the liquid slug. The existing plunger gas lift process parameter calculation method does not consider the influence of gas channeling, so that the closing pressure accumulation time is short, the closing pressure recovery is low, the plunger cannot be lifted to a wellhead smoothly after the well is opened, and the gas well liquid discharge effect is poor. Therefore, it is needed to perfect the calculation method of the plunger gas lift process parameters to improve the plunger gas lift liquid discharging effect.
Disclosure of Invention
Aiming at the technical defects that the existing plunger gas lift process parameter calculation method does not consider the influence of gas channeling, so that the closing time is short, the closing pressure is low to recover, the plunger cannot be lifted to a wellhead smoothly after the well is opened, and the gas well liquid discharge effect is poor, is provided with the plunger gas lift process parameter calculation method for the gas well, and the plunger gas lift process parameter calculation method is introduced with channeling factors in the calculation process, so that the plunger gas lift process parameter calculation precision is greatly improved, the plunger gas lift process parameter calculation method is reliable in principle, simple in operation, and capable of providing basis for optimization of the plunger gas lift liquid discharge process parameter of the gas well, improving the production efficiency, and having wide market prospects.
In order to achieve the above purpose, the present invention provides the following technical solutions:
step A: calculating single liquid carrying quantity Q of plunger gas lift L3 ：
Wherein: q (Q) L3 Plunger gas lift single liquid carrying amount, m 3 ；
Q L1 Daily liquid production during normal liquid drainage of gas well, m 3 /d；
Q L2 Daily liquid production during non-liquid drainage measures of gas well, m 3 /d；
n-plunger gas lift period, h.
And (B) step (B): utilizing the plunger gas lift in the step A to carry liquid quantity Q once L3 Calculating the minimum sheath pressure P of plunger gas lift cmin 。
Wherein: p (P) cmin -minimum sheath pressure of plunger gas lift, MPa;
P t -oil pressure during production of the gas well, MPa;
P lf -friction between the upper liquid slug of the plunger and the inner wall of the oil pipe, MPa;
ρ l density of liquid slugs in the upper part of the plunger, kg/m 3 ；
m z -plunger body mass, kg;
g-gravity acceleration, kg.m/s 2 ；
d, oil pipe inner diameter, mm;
l-height of liquid column, m;
v-average plunger lifting speed, m/s;
Re-Reynolds number, dimensionless;
μ l -liquid viscosity, mpa·s.
When the plunger and the liquid slug move to the wellhead position, only single-phase gas exists under the plunger, the pressure of a static gas column in the oil pipe is equal to that of a static gas column in an oil sleeve annulus, and the plunger gas lift process is mainly used for assisting a gas well with lower gas production capacity and incapable of carrying liquid by itself to drain liquid, so that the gas flow rate in the oil pipe is low, the friction of the gas flow at the lower part of the plunger can be ignored, and the pressure at the lower part of the plunger is equal to the casing pressure. If the plunger and the liquid slug are to be ensured not to fall back at the wellhead position, the pressure at the lower part of the plunger should not be lower than the resistance of the plunger operation, namely the minimum casing pressure of the plunger gas lift is:
P cmin ＝P t +P lf +P zf +P m
wherein: p (P) zf -friction resistance between plunger and inner wall of oil pipe, MPa;
P m the pressure required to overcome the weight of the plunger and liquid slug, MPa.
Experimental research shows that (Cao Yinping. Simulation and optimization of plunger gas lift drainage and gas production of highly deviated well [ D ]. Southwest Petroleum university, 2018), during the plunger lifting process, gas continuously flows in a large amount through a gap between the plunger and the oil pipe, and the plunger is not in direct contact with the inner wall of the oil pipe or has small contact area, so that the friction resistance between the plunger and the inner wall of the oil pipe can be ignored.
Pressure P required to overcome the weight of the plunger and liquid slug m Can be calculated by the following formula:
m＝ρ l Q L3 +m z
wherein: m-mass of plunger and liquid slug kg.
The friction between the upper liquid slug of the plunger and the inner wall of the oil pipe can be calculated by adopting a pipe flow friction formula of incompressible fluid:
step C: using the minimum sheath pressure P of the plunger gas lift in the step B cmin Calculating the minimum channeling q of gas in the lifting process of the plunger min 。
Wherein: ρ g Gas density at atmospheric pressure, kg/m 3 ；
Beta-fidaxy coefficient, pa.S 2 For annular gap flow between the inner wall of the oil pipe and the sealing surface of the plunger, beta may be 200 Pa.S 2 /kg；
A-cross-sectional area of annular gap between inner wall of oil pipe and sealing face of plunger, m 2 ；
T 1 -wellhead temperature, K;
q minj at atmospheric pressure, temperature T 1 Gas volume flow at time, m 3 /s；
μ g -gas viscosity, pa·s;
b-gap width of annular gap between inner wall of oil pipe and plunger, m;
p-atmospheric pressure, MPa;
l-length of plunger sealing face, m;
T 0 -standard temperature, K;
Z 0 pressure P and temperature T 1 The gas compression factor is dimensionless;
d 1 -maximum outer diameter of the plunger sealing face, m.
q min Minimum channeling of gas (under standard conditions), m 3 /s。
The gap between the plunger and the inner wall of the oil pipe can be regarded as a concentric cylinder annular gap, and when the gas at the lower part of the plunger flows through the concentric cylinder annular gap, the gap is equivalent to the gap with the width pi d 1 Flow in parallel plate gap (Wang Xi. Optimization design of plunger gas lift seal Structure and analysis of gap flow characteristics [ D ]]University of western petroleum, 2019). Characterization of gas flow Ranjith P G, viete D R.applicability of the 'cubiclaw' for non-Darcian fracture flow [ J ] by Forchemer equation taking into account the non-Darcy effect of high velocity channeling of gas in the gap].Journal of Petroleum ence&Engineering,2011,78(2):321-327.)，
Wherein: k (K) g Gap gas permeability, m 2 ；
According to the cube law of parallel plate gap flow (Baoyu, zhan Meili, zhao Jian. Smooth crack water flow model experiment and mechanism initial detection [ J)]Hydraulic journal, 1994,000 (005): 19-24.), K g Can be calculated by the following formula:
deducing the relation between the flow speed and the pressure when the gas flows through the clearance between the plunger and the inner wall of the oil pipe:
from q=a g v g The relation between the minimum channeling amount of gas and the pressure in the lifting process of the plunger can be derived:
wherein: q-gasVolume flow, m 3 S, q=q when calculating the minimum gas channeling during ram lifting minj ；
A g Area of excess flow of gas, m 2 When calculating the minimum channeling amount of gas in the lifting process of the plunger, A g ＝A；
v g -the flow rate of the gas in the gap, m/s;
P rk pressure at gap inlet, MPa, P when calculating minimum gas channeling during ram lifting rk ＝P cmin ；
P ck Pressure at gap outlet, MPa, P when calculating minimum gas channeling during ram lifting rk ＝P t ；
L z -total length of gap, m, when calculating minimum gas channeling during plunger lifting, L z ＝L+l。
According to the gas state equation, the relation between the gas volume flow at the well bore temperature and the gas volume flow under the standard condition can be obtained:
step D: utilizing the minimum channeling rate q of the gas in the step C min Calculating the gas lift gas requirement Q of a single plunger g 。
Q g ＝Q gmin +Q gp
Wherein: q (Q) g Single plunger gas lift gas requirement, m 3 ；
Q gmin Total channeling flow in plunger gas lift process, m 3 ；
Q gp Oil pipe pressure increasing required gas amount m in plunger gas lift process 3 ；
H-the depth of the plunger clamping device, m;
P 1 -average pressure over the plunger catch at the start of plunger gas lift, MPa;
P 2 -the average pressure over the plunger catch when the plunger is lifted to the wellhead, MPa;
internal volume of upper oil pipe of V-plunger fastener, m 3 ；
-the average temperature, K, in the upper tubing of the plunger latch;
Z 2 pressure of P cmin At a temperature ofThe gas compression factor is dimensionless;
Z 1 pressure of P t At a temperature ofThe gas compression factor is dimensionless;
h-the plunger clamping device hangs down deeply, m;
G t -ground temperature gradient, K/100m;
gamma-natural gas relative density, dimensionless.
Single plunger gas lift air requirement Q g Comprising total channeling flow rate Q of gas gmin From P with the pressure of gas in the oil pipe 1 Boost to P 2 Required gas quantity Q gp . The total channeling rate of the gas can be calculated by the minimum channeling rate q of the gas min And calculating lifting time, namely:
calculating wellhead pressure as P by a single-phase gas static column pressure formula t 、P cmin Pressure at plunger detent:
and further calculating the average pressure in the oil pipe:
finally, the gas state equation is utilized to calculate the gas quantity Q needed by boosting gp ：
Wherein: p (P) tb -wellhead pressure P t When the pressure of the plunger clamping device is lower than the pressure of MPa;
P cminb -wellhead pressure P cmin When the pressure of the plunger clamping device is lower than the pressure of MPa;
step E: utilizing the single plunger gas lift gas requirement Q in the step D g Calculating the casing pressure P required to be reached in the well closing process of a single plunger gas lift period c 。
Wherein: p (P) c Casing pressure required to be achieved by closing the well in a single plunger gas lift period is MPa;
P 3 the jacket pressure is P c Average pressure of oil jacket annulus is equal to MPa;
V c volume of the oil jacket annulus above the plunger-latch, m 3 。
The high-pressure gas in the oil sleeve annulus is used as a gas source of the plunger gas lift when the average pressure of the plunger gas lift is equal to P 3 Down to P 2 The gas quantity released during the process is equal to the gas lift gas quantity Q of the single plunger g The gas state equation is utilized to calculate the casing pressure P required to be reached in the well closing process of a single plunger gas lift period c ：
Step F: using the casing pressure P required to be reached in the closing of the well in the single plunger gas lift period in the step E c A shut-in duration t is determined within a single plunger gas lift cycle.
After the gas well is shut in, the casing pressure is controlled by P cmin Rising to P c The required time is the shut-in duration t in a single plunger gas lift cycle. If the highest pressure of the shut-in gas well is less than P c Or t is greater than or equal to n, let n=n-1 and repeat steps a to F;if t < n, the plunger gas lift parameters can be determined as follows: the plunger gas lift period is n, and the casing pressure required to be reached in the well closing process in a single plunger gas lift period is P c The closing time is t.
According to the invention, the channeling factor is introduced in the calculation process, so that the calculation precision of the plunger gas lift process parameter is greatly improved, the existing well closing pressure accumulation time and well closing pressure are corrected, the plunger can be smoothly lifted to a wellhead after well opening, and the gas well drainage effect is better; the invention has reliable principle and simple operation, can provide basis for optimizing the gas well plunger gas lift liquid discharge process parameters, improves the production efficiency and has wide market prospect.
As a preferred embodiment of the present invention, n=24 h is taken for the first calculation in step a, i.e. the plunger gas lift operating frequency is 1/d.
In the step A, 24 hours are one day, so that the initial value of n is taken for 24 hours in the first calculation, and the actual production condition in the field is more met.
As a preferred embodiment of the present invention, v=5m/s is taken in step B for gas wells where the plunger operating speed is not monitored.
In the step B, the velocity of the plunger in the actual measurement of the long-distance gas field is 5.08m/s, and the velocity of the plunger in the actual measurement of the long-distance gas field is about 5.01m/s, so that for a gas well with the running velocity of the plunger not monitored, the plunger ascending velocity can be determined to be 5m/s by referring to the long-distance gas field and the long-distance gas field.
As a preferable mode of the invention, in the step C, beta is 200 Pa.S for the annular clearance flow between the inner wall of the oil pipe and the sealing surface of the plunger 2 /kg。
In the step C, the clearance between the sealing surface of the conventional plunger tool and the inner wall of the oil pipe is 0.3-1.0mm, namely the clearance width of the annular clearance is 0.3-1.0mm, and experimental results show that (Chen Chi. Shale gas reservoir clean water fracturing self-supporting crack conductivity research [ D)]University of southwest petroleum, 2014) when the gas flow has a fedami coefficient β of about 200pa·s 2 /kg。
The beneficial effects of the invention are as follows: according to the invention, the channeling factor is introduced in the calculation process, so that the calculation accuracy of the plunger gas lift process parameter is greatly improved, the principle is reliable, the operation is simple, the basis can be provided for optimizing the plunger gas lift liquid discharge process parameter of the gas well, the production efficiency is improved, and the method has a wide market prospect.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a flowchart of the calculation steps of the present invention.
Detailed Description
Table 1 shows actual parameters of a well (X-well), and thus, the steps of the present invention will be described in detail, and the flow of the calculation steps is shown in fig. 1.
Table 1: x-well structural parameter and production data table
The calculation method of the gas well plunger gas lift technological parameters sequentially comprises the following steps:
step A: calculating single liquid carrying quantity Q of plunger gas lift L3 ：
N=24 h is calculated for the first time, and the single liquid carrying quantity Q of the plunger gas lift is calculated L3 0.35m3.
And (B) step (B): utilizing the plunger gas lift in the step A to carry liquid quantity Q once L3 Calculating the minimum sheath pressure P of plunger gas lift cmin 。
Calculating to obtain the minimum plunger gas lift casing pressure P cmin 3.86MPa.
Step C: using the minimum sheath pressure P of the plunger gas lift in the step B cmin Calculating the minimum channeling q of gas in the lifting process of the plunger min 。
Calculating the minimum channeling q of gas in the lifting process of the plunger min 0.0352m3/s.
Step D: utilizing the minimum channeling rate q of the gas in the step C min Calculating the gas lift gas requirement Q of a single plunger g 。
Q g ＝Q gmin +Q gp
Calculating to obtain the gas lift requirement Q of the single plunger g 276.85m3.
Step E: utilizing the single plunger gas lift gas requirement Q in the step D g Calculating the casing pressure P required to be reached in the well closing process of a single plunger gas lift period c 。
Calculating the casing pressure P required to be reached in the well closing process of a single plunger gas lift period c 4.33MPa.
Step F: using the casing pressure P required to be reached in the closing of the well in the single plunger gas lift period in the step E c A shut-in duration t is determined within a single plunger gas lift cycle.
Table 2 shows the casing pressure values of the X well at different well closing times, and it is known through calculation that when n=24 hours, the plunger operation requirement cannot be satisfied; therefore, n=n-1 is taken and steps a to F are repeated, and the calculation results are shown in table 3.
Table 2: casing pressure value of X well under different well closing time
| Closing time, h | Jacket pressure value, MPa | Closing time, h | Jacket pressure value, MPa | Closing time, h | Jacket pressure value, MPa |
| 1 | 3.11 | 9 | 3.84 | 17 | 3.85 |
| 2 | 3.44 | 10 | 3.84 | 18 | 3.85 |
| 3 | 3.67 | 11 | 3.84 | 19 | 3.85 |
| 4 | 3.82 | 12 | 3.85 | 20 | 3.85 |
| 5 | 3.83 | 13 | 3.85 | 21 | 3.85 |
| 6 | 3.83 | 14 | 3.85 | 22 | 3.85 |
| 7 | 3.83 | 15 | 3.85 | 23 | 3.85 |
| 8 | 3.84 | 16 | 3.85 | 24 | 3.85 |
Table 3: plunger gas lift period and well closing time under different plunger gas lift periods
According to the calculation result, the gas lift process parameters of the X-well plunger are obtained as follows: the plunger gas lift period n is 16h, and the well closing time t is 4h
According to the invention, the channeling factor is introduced in the calculation process, so that the calculation precision of the plunger gas lift process parameter is greatly improved, the existing well closing pressure accumulation time and well closing pressure are corrected, the plunger can be smoothly lifted to a wellhead after well opening, and the gas well drainage effect is better; the invention has reliable principle and simple operation, can provide basis for optimizing the gas well plunger gas lift liquid discharge process parameters, improves the production efficiency and has wide market prospect.
Claims (4)
1. The calculation method of the gas well plunger gas lift process parameters is characterized by comprising the following steps of:
A. calculating single liquid carrying quantity Q of plunger gas lift L3 ：
Wherein: q (Q) L3 Plunger gas lift single liquid carrying amount, m 3 ；
Q L1 Daily liquid production during normal liquid drainage of gas well, m 3 /d；
Q L2 Daily liquid production during non-liquid drainage measures of gas well, m 3 /d；
n-plunger gas lift cycle in hours (h);
B. using Q from step A L3 Calculating the minimum sheath pressure P of plunger gas lift cmin；
Wherein: p (P) cmin -minimum sheath pressure of plunger gas lift, MPa;
P t -oil pressure during production of the gas well, MPa;
P lf -friction between the upper liquid slug of the plunger and the inner wall of the oil pipe, MPa;
ρ l density of liquid slugs in the upper part of the plunger, kg/m 3 ；
m z -plunger body mass, kg;
g-gravity acceleration, kg.m/s 2 ；
d, oil pipe inner diameter, mm;
l-height of liquid column, m;
v-average plunger lifting speed, m/s;
Re-Reynolds number, dimensionless;
μ l -liquid viscosity, mpa·s;
C. by using P obtained in step B cmin Calculating the minimum channeling q of gas in the lifting process of the plunger min；
Wherein: ρ g Gas density at atmospheric pressure, kg/m 3 ；
Beta-fidaxy coefficient, pa.S 2 /kg；
A-cross-sectional area of annular gap between inner wall of oil pipe and sealing face of plunger, m 2 ；
T 1 -wellhead temperature, K;
q minj at atmospheric pressure, temperature T 1 Gas volume flow at time, m 3 /s；
μ g -gas viscosity, pa·s;
b-gap width of annular gap between inner wall of oil pipe and plunger, m;
p-atmospheric pressure, MPa;
l-length of plunger sealing face, m;
T 0 -standard temperature, K;
Z 0 pressure P and temperature T 1 The gas compression factor is dimensionless;
d 1 -maximum outer diameter of the plunger sealing face, m;
q min minimum channeling of gas (under standard conditions), m 3 /s；
D. Q obtained by step C min Calculating the gas lift gas requirement Q of a single plunger g；
Q g ＝Q gmin +Q gp
Wherein: q (Q) g Single plunger gas lift gas requirement, m 3 ；
Q gmin Total channeling flow in plunger gas lift process, m 3 ；
Q gp Oil pipe pressure increasing required gas amount m in plunger gas lift process 3 ；
H-the depth of the plunger clamping device, m;
P 1 -average pressure over the plunger catch at the start of plunger gas lift, MPa;
P 2 -the average pressure over the plunger catch when the plunger is lifted to the wellhead, MPa;
internal volume of upper oil pipe of V-plunger fastener, m 3 ；
-the average temperature, K, in the upper tubing of the plunger latch;
Z 2 pressure of P cmin At a temperature ofThe gas compression factor is dimensionless;
Z 1 pressure of P t At a temperature ofThe gas compression factor is dimensionless;
h-the plunger clamping device hangs down deeply, m;
G t -ground temperature gradient, K/100m;
gamma-natural gas relative density, dimensionless;
E. using Q from step D g Calculating the casing pressure P required to be reached in the well closing process of a single plunger gas lift period c；
Wherein: p (P) c Casing pressure required to be achieved by closing the well in a single plunger gas lift period is MPa;
P 3 the jacket pressure is P c Average pressure of oil jacket annulus is equal to MPa;
V c volume of the oil jacket annulus above the plunger-latch, m 3 ；
F. Using P from step E c A shut-in duration t is determined within a single plunger gas lift cycle.
2. The method for calculating gas well plunger gas lift process parameters according to claim 1, wherein n=24 h is taken for the first calculation in the step a, namely the plunger gas lift operation frequency is 1 time/d.
3. The method of claim 1, wherein v=5m/s is taken for a gas well in which the plunger operating speed is not monitored in step B.
4. The method for calculating gas well plunger gas lift process parameters according to claim 1, wherein in step C, for oil pipeAnnular gap between inner wall and sealing surface of plunger piston flows, beta takes 200 Pa.S 2 /kg。
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