CN115879644A - Shale gas well production mode optimization method based on optimized tubular column - Google Patents
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Abstract
The invention provides a shale gas well production mode optimization method based on an optimized tubular column, and belongs to the technical field of gas well drainage and extraction processes. The method comprises the following steps: collecting shale gas well production dynamic parameters, and fitting a shale gas well productivity index and a decreasing coefficient; constructing a shale gas well shaft pressure drop model, calculating the change rule of pressure drop of inner diameters of different oil pipes along with the gas production rate, and determining the stable gas production rate of the minimum pressure drop point of the inner diameters of the different oil pipes; taking the low-yield stable-production stage of the shale gas well as a reference, and preferably selecting the inner diameter of an oil pipe at the minimum pressure drop point to ensure the stable production of the shale gas; the production mode of the shale gas well is optimally designed, the opening of an oil sleeve annulus valve is continuously adjusted, so that the oil pipe is in the state of minimum pressure drop and stable production is mainly performed by liquid drainage, the flow area of an oil sleeve annulus channel is large to assist gas production, and the shale gas well is ensured to be produced in the mode of minimum pressure drop loss; therefore, the design method is simple and applicable, and provides a theoretical basis for the optimal design of the shale gas well drainage and production process.
Description
Technical Field
The invention belongs to the field of gas reservoir drainage and gas production, and particularly relates to a shale gas well production mode optimization method based on an optimized tubular column.
Technical Field
The permeability of the shale gas reservoir is far smaller than that of a conventional gas reservoir, so that the yield decreasing rule of the shale gas well is different from that of the conventional gas well, and the shale gas well has the characteristics of high initial-stage liquid yield and fast gas yield decreasing. Along with the production, the bottom hole flowing pressure of the shale gas well is greatly reduced, the liquid carrying capacity is reduced, further, formation water is gathered at the bottom hole, the pressure drop loss of a shaft is increased, and the gas well is in a low-yield stage for a long time. And in the low-yield stage, the formation energy is insufficient, the liquid holding rate of a shaft is high, and the accumulated liquid cannot be carried out of a well mouth by depending on the self energy of a gas well in the production process of a conventional oil pipe channel. Therefore, the key point for improving the ultimate recovery rate of the shale gas well is to discharge gas well accumulated liquid in a low-yield stage in time.
The conventional gas well drainage and gas production process measures such as a speed pipe column, a foam row, plunger lifting, an electric submersible pump, gas lifting and the like are adopted. Different processes have different characteristics, for example, foam discharging utilizes gas-liquid stirring to generate water-containing foam with lower density, and formation water is continuously discharged in the form of foam; the electric submersible pump directly discharges the accumulated liquid out of the well mouth through the pressurization of the pump. However, the intervention time and the applicable limit of different process measures are fuzzy, and most of the intervention time and the applicable limit depend on the field working experience of the conventional gas well. And the application range of the same process measure is limited, so that a reasonable drainage and production process design scheme is made difficultly by combining the production dynamic parameters of the shale gas well at the low-yield stage, and continuous liquid carrying of the shale gas well at the low-yield stage is realized.
The essence of the process design is that the purpose of water drainage and gas recovery is achieved by pressurizing or reducing the flow rate of liquid carrying gas. For shale gas wells, the liquid production amount is large at the initial production stage, but the stratum energy is sufficient, and only a casing is adopted for production. When production drops to a certain range, shale gas wells enter a low production stage, typically by running tubing. The technological measures can reduce the gas flow area, improve the gas flow speed, enhance the liquid carrying capacity of the gas well and have the effect of stabilizing the yield. The timing of putting the oil pipe in and the inner diameter of the oil pipe are key parameters for implementing the process.
The prior empirical method considers that the oil pipe is put into the well in the early production period so as to be beneficial to the production of the gas well. Research results show that the flow stability is good when the inner diameter of the oil pipe is small, but the higher the gas production rate is, the larger the pressure drop of the friction resistance item of the shaft is. Indicating that early run-in tubing may limit gas well production due to excessive pressure drop in the friction term. The theoretical method can predict the time for putting the oil pipe into the well and preferably select the optimal inner diameter of the oil pipe according to the gas production rate in a certain range. But the formation energy is gradually reduced, the gas production rate is continuously reduced, and the long-term stable production of the gas well can not be maintained by the same oil pipe inner diameter. Therefore, two main factors of liquid carrying and pressure drop loss are considered, a reasonable production system is designed by combining the change rule between the two factors, namely the drainage and gas production functions of an oil pipe channel can be continuously utilized, and the accumulated liquid of a gas well is continuously discharged; and the formation energy can be utilized to ensure that the shale gas well can be stably produced in a mode of minimum pressure drop loss.
Therefore, aiming at the problem of long low-yield stage of the shale gas well, the invention analyzes and determines the time for putting the oil pipe in, combines with the dynamic production parameters of the shale gas well to determine the inner diameter of the oil pipe, and provides a production mode for simultaneously producing the oil pipe channel and the oil sleeve annulus channel, so that the oil pipe channel is in the state of minimum pressure drop loss, stable production is mainly performed by liquid drainage, and the gas production is assisted when the flow area of the oil sleeve annulus is large, thereby ensuring that the shale gas well is produced in the mode of minimum pressure drop loss.
Disclosure of Invention
The invention aims to solve the problems that a low-yield stage of a shale gas well is long, accumulated liquid cannot be timely discharged out of a shaft, and normal production of the gas well is affected, and provides a shale gas well production mode optimization method based on an optimized tubular column. Providing a theoretical basis for the optimal design of the discharging and mining process.
In order to achieve the purpose, the shale gas well production mode optimization method based on the optimized tubular column is provided. The method comprises the following steps:
step S1: determining a shale gas well productivity index and a decrement coefficient, collecting shale gas well target block well test actual measurement data and early-stage production data, selecting a shale gas well productivity empirical formula and a Duong model yield decrement relational expression, calculating the shale gas well productivity index and a Levenberg-Marquardt method fitting decrement coefficient by using a least square method, and drawing a gas well inflow dynamic curve and a yield decrement rule curve;
step S2: determining the time for lowering the oil pipe, collecting dynamic production data and well body structure data of the shale gas well, calculating a casing outflow curve by using a wellbore pressure drop model, and combining a node system analysis method, wherein when the shale gas well stratum inflow dynamic curve and the casing outflow dynamic curve are intersected at a unique intersection point, the corresponding gas production is the blowout stopping gas production, and the corresponding production time is the time for lowering the oil pipe;
and step S3: the inner diameter of an oil pipe is optimized, the lowest pressure drop points of outflow dynamic curves of different inner diameters of the oil pipe are taken as reference points, a regular curve of gas production quantity changing along with the inner diameter of the oil pipe is drawn, the trend of the shale gas well yield decreasing rule is analyzed, the gas production quantity in the low-yield stable-yield stage is determined, and the corresponding inner diameter of the oil pipe is read from the changing curve of the inner diameters of the different oil pipes along with the gas production quantity at the minimum pressure drop point, namely the inner diameter of the target oil pipe;
and step S4: the production mode is optimally designed, the shale gas well is ensured to be produced in a mode of minimum pressure drop loss, casing production is adopted in the initial stage, an oil pipe channel is adopted for production along with the completion of a stable casing production stage in the production process, the opening of an oil casing annular valve of the shale gas well is gradually adjusted, so that the yield of the oil pipe channel at the minimum pressure drop point is realized, stable production and continuous liquid carrying are realized, and the large flow area of the oil casing annular channel is utilized for assisting in gas production;
further, step S1 collects the average formation pressure, the actual measurement data of the gas well productivity test and the previous production data of the target block, and selects a common empirical formula of gas well productivity in engineering:
in the formula (I), the compound is shown in the specification,Q g for gas well production, m 3 /d；JIs the gassing index, m 3 /(d . MPa)；p r Is the average formation pressure, MPa;p wf is the bottom hole flowing pressure in MPa.
According to the measured data of the gas well productivity well test, the productivity index is obtained by using least square fittingJAnd drawing a formation inflow dynamic curve.
The shale gas well yield decrement empirical relation adopts a Duong model, and the expression is as follows:
in the formula (I), the compound is shown in the specification,Q gi for gas well production at earlier stages, m 3 /d；tProduction time, d; m is a power function exponent and is dimensionless; and a is a decreasing coefficient, 1/d.
And fitting the power function index m and the decreasing coefficient a by using a Levenberg-Marquardt method according to the production data of the previous shale gas well.
Further, step S2, collecting shale gas well production dynamic data and well body structure data, and calculating a casing outflow dynamic curve, wherein the selected shaft pressure drop model expression is as follows:
in the formula (I), the compound is shown in the specification,pis the pressure, pa; z is depth, m;ρ m is a mixed density of kg/m 3 ；gIs the acceleration of gravity, m/s 2 ；θAngle of well, degree;fthe friction coefficient is dimensionless;v m is the apparent velocity of the gas-liquid mixture, m/s;Dis the pipe diameter, m.
The expression of the superficial velocity of the gas-liquid mixture is as follows:
in the formula (I), the compound is shown in the specification,v SG is the superficial gas flow rate, m/s;v SL the apparent liquid flow rate is m/s.
The density of mixing is a function of liquid holdup and is expressed as:
in the formula (I), the compound is shown in the specification,H L percent is liquid holdup;ρ L is liquid density, kg/m 3 ；ρ G Is gas density, kg/m 3 。
New liquid holdup model suitable for shale gas horizontal well and built based on experimental test and theoretical analysisH L The expression is as follows:
in the formula (I), the compound is shown in the specification,f 0 the water content is decimal fraction.
Coefficient of friction resistancefAdopting a calculation method in a Mukherjee-Brill model:
in the formula (I), the compound is shown in the specification,em is the absolute roughness;N Re the Reynolds number without slip is dimensionless, and the expression is:
in the formula (I), the compound is shown in the specification,ρ ns density of the mixture without slip, kg/m 3 ；μ ns Viscosity of the mixture without slippage, pas.
Combining the stratum inflow dynamic curve, determining the oil pipe descending time according to the analysis of a node system, predicting and analyzing the inflow dynamic curve under different stratum pressures in the future, when the shale gas well stratum inflow dynamic curve and the casing outflow dynamic curve are intersected at a unique intersection point, the corresponding yield is the blowout stop gas production rate, the corresponding production time is the oil pipe descending time, and the casing stable production stage is finished.
Further, in the step S3, the inner diameter of an oil pipe is optimized, the pressure of a wellhead is set as the pipeline pressure of the shale gas well, and a curve that the pressure drop of the oil pipes with different inner diameters changes along with the gas production rate is calculated by using a shaft pressure drop model; according to the calculation result, the pressure drop change rules of oil pipes with different inner diameters are consistent, the pressure drop of the shaft is firstly reduced and then increased along with the increase of the gas production rate, and the lowest point of the pressure drop exists and is defined as the minimum pressure drop point. According to the gas production rate corresponding to the minimum pressure drop point under different inner diameters of oil pipesDrawing a regular curve of the gas production amount of the minimum pressure drop point along with the change of the pipe diameter; meanwhile, the yield change trend of the gas well is predicted by adopting a shale gas well yield decline model Duong, and the shale gas well is known to have a low-yield stable-yield period, and the gas yield of the low-yield stable-yield period isQ L (ii) a By usingQ L The corresponding inner diameter of the oil pipe can be read from the curve of the inner diameters of different oil pipes at the minimum pressure drop point along with the change of the gas production rater L I.e. the target tubing internal diameter.
Furthermore, the production mode is optimally designed in the step S4, the formation energy is sufficient in the initial stage, the liquid production amount and the gas production amount are high, and the stable production of the shale gas well can be realized through casing production; along with the reduction of the flowing pressure at the bottom of the well, based on a node system analysis method, when only a unique intersection point exists between a stratum inflow dynamic curve and a casing outflow dynamic curve, the casing production stage is finished, and the production is carried out by adopting an oil pipe channel. In the initial production stage of the oil pipe channel, for timely discharging accumulated liquid at the bottom of the well, the oil sleeve annular space is closed, based on the principle of a U-shaped pipe, the oil sleeve annular space channel is communicated with the oil pipe channel, and the accumulated liquid in the oil sleeve annular space channel gradually flows into the oil pipe channel and is discharged out of a shaft. And (3) carrying out statistics on shale gas well production dynamic parameters, analyzing the dispersion degree of oil pressure and gas production data, and when the standard deviation of oil pressure and gas production data points is close to 0, indicating that the oil pressure and the gas production are gradually stable and bottom hole effusion is discharged. The opening of an oil sleeve annular valve of the shale gas well is gradually adjusted, an oil sleeve annular passage is produced in a pure gas mode, the gas circulation area of the oil sleeve annular passage is large, the gas flow rate is low, liquid carrying cannot occur, liquid accumulation cannot occur in the oil sleeve annular passage, and the oil sleeve annular passage is connected with an oil pipe passage to cause formation water to be discharged through the oil pipe passage. Meanwhile, the yield of the oil pipe channel at the minimum pressure drop point is ensured to realize stable production and continuous liquid carrying, namely the stable production of the oil pipe at the minimum pressure drop point is maintained, liquid drainage is mainly used, and the flow area of the oil sleeve annular channel is large to assist in gas production.
Compared with the prior art, the invention has the advantages that:
according to the shale gas well production mode optimization method based on the optimized tubular column, the low-yield stage length of the shale gas well is considered, the gas well accumulated liquid is discharged in time, the gas well productivity can be improved, the influence of yield and liquid carrying on wellbore flow is considered, the production mode that oil pipe carries liquid mainly and annular space assists gas production is adopted, and the shale gas well is guaranteed to be produced in the mode of minimum pressure drop. Therefore, the method is simple and applicable, and provides a theoretical basis for the optimal design of the shale gas well drainage and production process.
Drawings
FIG. 1 is a schematic diagram of a nodal system analysis;
FIG. 2 is a pressure drop curve of a wellbore with oil pipes of different inner diameters;
FIG. 3 is a graphical illustration of a decreasing shale gas well production rate law;
FIG. 4 is a curve of steady gas production variation corresponding to the lowest point of pressure drop of oil pipes with different inner diameters;
figure 5 is a schematic illustration of a shale gas well production run,
1-oil pipe valve, 2-oil sleeve annulus valve, 3-oil pipe channel and 4-oil sleeve annulus channel.
Detailed Description
In order to make the objects, calculation processes and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The shale gas well has sufficient initial stratum energy, high liquid production and gas production, and stable production of the shale gas well can be realized by casing production; as production proceeds, the bottom hole flow pressure and gas production are greatly reduced. For this reason, designing a reasonable production system and optimizing the inner diameter of the oil pipe are crucial to stable production of shale gas wells.
Further, step S1 collects the average formation pressure of the target block and the measured data of the gas well productivity test, and selects a common gas well productivity empirical formula in engineering:
in the formula (I), the compound is shown in the specification,Q g for gas well production, m 3 /d；JIs the gas production index, m 3 /(d . MPa)；p r Is the average formation pressure, MPa;p wf is a wellBottom flow pressure, MPa.
According to the measured data of the gas well productivity well test, the productivity index is obtained by using least square fittingJAnd the formation inflow dynamics are plotted as shown in fig. 1.
The shale gas well yield decrement empirical relation adopts a Duong model, and the expression is as follows:
in the formula (I), the compound is shown in the specification,Q gi for gas well earlier stage gas production, m 3 /d；tProduction time, d; m is a power function exponent and is dimensionless; a is a decreasing coefficient, 1/d.
According to the production data of the previous shale gas well, a Levenberg-Marquardt method is used for fitting a power function index m and a decreasing coefficient a, and a gas well yield decreasing rule curve is drawn and is shown in figure 3.
Further, step S2, collecting shale gas well production dynamic data and well body structure data, calculating a casing outflow dynamic curve, and selecting a wellbore pressure drop model expression as follows:
in the formula (I), the compound is shown in the specification,pis the pressure, pa; z is depth, m;ρ m as a mixed density, kg/m 3 ；gIs the acceleration of gravity, m/s 2 ；θAngle of well, degree;fthe friction coefficient is dimensionless;v m is the apparent velocity of the gas-liquid mixture, m/s;Dis the pipe diameter, m.
The expression of the superficial velocity of the gas-liquid mixture is as follows:
in the formula (I), the compound is shown in the specification,v SG is the superficial gas flow rate, m/s;v SL the apparent liquid flow rate is m/s.
The mixing density is a function of liquid holdup and is expressed as:
in the formula (I), the compound is shown in the specification,H L percent is liquid holdup;ρ L is liquid density, kg/m 3 ；ρ G Gas density, kg/m 3 。
New liquid holdup model suitable for shale gas horizontal well and established based on experimental test and theoretical analysisH L The expression is as follows:
in the formula (I), the compound is shown in the specification,f 0 the water content is decimal.
Coefficient of friction resistancefAdopting a calculation method in a Mukherjee-Brill model:
in the formula (I), the compound is shown in the specification,em is the absolute roughness;N Re the Reynolds number without slip is dimensionless, and the expression is:
in the formula (I), the compound is shown in the specification,ρ ns density of the mixture without slip, kg/m 3 ；μ ns Viscosity of the mixture without slippage, pas.
And (4) determining the running-in time of the oil pipe according to the analysis of a node system by combining the stratum inflow dynamic curve. As shown in FIG. 1, initiallyt=t 1 During production, the bottom hole flowing pressure isP 1 The stratum inflow dynamic curve and the casing outflow dynamic curve have two intersection pointsX 10 AndX 11 as production proceeds, int=t 2 When the bottom hole flowing pressure is reduced toP 2 At the moment, the formation inflow dynamic curve and the casing outflow dynamic curveThere are also two intersectionsX 20 AndX 21 when the bottom hole flowing pressure is reduced toP M In the process, the shale gas well stratum inflow dynamic curve and the casing outflow dynamic curve are intersected at the unique intersection pointX M0 Corresponding production timet=t M Namely the time for running the oil pipe.
Further, in the step S3, the inner diameter of the oil pipe is preferably selected, the wellhead pressure is set as the pipeline pressure of the shale gas well, and a curve of the pressure drop of the oil pipe with different inner diameters along with the change of the gas production rate is calculated by using a wellbore pressure drop model, as shown in fig. 2. According to the calculation result, when the inner diameter of the oil pipe isr=r 1 When the gas production rate is increased, the pressure drop of the shaft is firstly reduced and then increased, and the lowest point of the pressure drop existsH 1 Defined as the minimum pressure drop point, different bore diameter tubingr 1 <r 2 <……<r N The pressure drop change rule of the shaft is consistent; according to the minimum pressure drop point under different inner diameters of oil pipesH 1 、H 2 ……H N And (3) correspondingly, a curve of the gas production at the minimum pressure drop point along with the change of the inner diameter of the oil pipe can be drawn, as shown in fig. 4. Meanwhile, the yield change trend of the gas well is predicted by adopting a shale gas well yield decline model Duong, and the shale gas well is known to have a low-yield stable-yield period, and the gas yield of the low-yield stable-yield period isQ L As shown in fig. 3. By usingQ L The corresponding inner diameter of the oil pipe can be read from the curve of the inner diameters of different oil pipes at the minimum pressure drop point along with the change of the gas production rater L I.e. the target oil pipe inner diameterr=r L 。
Furthermore, the production mode is optimally designed in the step S4, the formation energy is sufficient in the initial stage, the liquid production amount and the gas production amount are high, and the stable production of the shale gas well can be realized through casing production; with the gradual reduction of the bottom hole flowing pressure, only a unique intersection point exists between the inflow dynamic curve of the ground layer and the outflow dynamic curve of the casing based on the analysis method of the node systemX M0 At the end of the production phase of the casing, the run-in internal diameter isr=r L The production mode of the oil pipe is adjusted to be oil pipe production, as shown in figure 5, the oil pipe valve 1 is fully opened, and the oil sleeve annular valve 2 is closedFormation fluid is produced from the tubing passages 3. In the initial production stage of the oil pipe, in order to discharge accumulated liquid at the bottom of the well in time, the oil sleeve annular valve 2 is closed, based on the principle of a U-shaped pipe, the oil sleeve annular passage 4 is communicated with the oil pipe passage 3, and the accumulated liquid in the oil sleeve annular passage 4 gradually flows into the oil pipe passage 3 and is discharged out of a shaft. And (3) carrying out statistics on shale gas well production dynamic parameters, analyzing the dispersion degree of oil pressure and gas production data, and when the standard deviation of oil pressure and gas production data points is close to 0, indicating that the oil pressure and the gas production are gradually stable and bottom hole effusion is discharged. The opening of an oil sleeve annular valve 2 of the shale gas well is gradually adjusted, an oil sleeve annular passage 4 is produced in a pure gas mode, the circulation area of an oil sleeve ring is large, the air flow rate is low, liquid carrying cannot be carried, liquid accumulation cannot occur in the oil sleeve annular passage 4, and formation water is discharged through the oil pipe passage 3 as the oil sleeve annular passage 4 is connected with the oil pipe passage 3; meanwhile, the yield of the oil pipe channel 3 at the minimum pressure drop point is ensured to realize stable production and continuous liquid carrying, namely the stable production of the oil pipe at the minimum pressure drop point is maintained, liquid drainage is mainly used, and the flow area of the oil sleeve annular channel 4 is large to assist in gas production.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (3)
1. A shale gas well production mode optimization method based on an optimized tubular column is characterized by mainly comprising the following steps:
step S1: determining a shale gas well productivity index and a decrement coefficient, collecting shale gas well target block well test actual measurement data and early-stage production data, selecting a shale gas well productivity empirical formula and a Duong model yield decrement relational expression, calculating the shale gas well productivity index and a Levenberg-Marquardt method fitting decrement coefficient by using a least square method, and drawing a gas well inflow dynamic curve and a yield decrement rule curve;
step S2: determining the time for lowering an oil pipe, collecting production dynamic data and well body structure data of the shale gas well, calculating a casing outflow curve by using a shaft pressure drop model, and combining a node system analysis method, wherein when the inflow dynamic curve of the shale gas well stratum and the casing outflow dynamic curve are intersected at a unique intersection point, the corresponding gas production is the gas production for stopping the injection, and the corresponding production time is the time for lowering the oil pipe;
and step S3: the inner diameter of an oil pipe is optimized, the lowest pressure drop points of outflow dynamic curves of different inner diameters of the oil pipe are taken as reference points, a regular curve of gas production along with the change of the inner diameter of the oil pipe is drawn, the trend of the shale gas well yield decreasing rule is analyzed, the gas production at the low-yield stable-yield stage is determined, and the corresponding inner diameter of the oil pipe is read from the change curve of the inner diameters of different oil pipes along with the gas production at the minimum pressure drop point, namely the inner diameter of a target oil pipe;
and step S4: the production mode is optimized, the shale gas well is ensured to be produced in a mode of minimum pressure drop loss, casing production is adopted in the initial stage, an oil pipe channel is adopted to produce when the casing stable production stage is finished along with production, the opening of an oil casing annular valve of the shale gas well is gradually adjusted, so that the yield of the oil pipe channel at the minimum pressure drop point is enabled to realize stable production and continuous liquid carrying, and the large flow area of the oil casing annular channel is utilized to assist gas production.
2. The shale gas well production mode optimization method based on the optimized tubular column as claimed in claim 1, wherein the step S3 of optimizing the inner diameter of the oil pipe comprises the following specific steps:
setting the wellhead pressure as shale gas well pipeline pressure transmission, and calculating curves of oil pipe pressure drop with different inner diameters along with gas production by using a shaft pressure drop model; according to the calculation result, the pressure drop change rules of oil pipes with different inner diameters are consistent, the pressure drop of the shaft is firstly reduced and then increased along with the increase of the gas production rate, and the lowest point of the pressure drop exists and is defined as the minimum pressure drop point; according to the gas production rate corresponding to the minimum pressure drop points under different inner diameters of the oil pipes, a regular curve of the gas production rate of the minimum pressure drop points along with the change of the pipe diameters can be drawn; meanwhile, the shale gas well yield decrement model Duong is adopted to predict the yield change trend of the gas well, so that the shale gas well yield decrement model Duong can be used for obtaining the shale gas well yield change trendThe gas well has a low-yield and stable-yield stage, and the gas yield of the low-yield and stable-yield stage isQ L (ii) a By usingQ L The corresponding inner diameter of the oil pipe can be read from the curve of the inner diameters of different oil pipes at the minimum pressure drop point along with the change of the gas production rater L I.e. the target tubing internal diameter.
3. The optimization method for the production mode of shale gas wells based on the optimized tubular column as claimed in claim 1, wherein the optimization design for the production mode in step S4 comprises the following specific processes:
the formation energy is sufficient in the initial stage, the liquid yield and the gas yield are high, and the stable production of the shale gas well can be realized by casing production; along with the reduction of the flowing pressure at the bottom of the well, based on a node system analysis method, when only a unique intersection point exists between a stratum inflow dynamic curve and a casing outflow dynamic curve, the casing production stage is finished, and oil pipe channel production is adopted; in the initial production stage of the oil pipe channel, in order to discharge accumulated liquid at the bottom of the well in time, the oil sleeve annulus is closed, based on the principle of a U-shaped pipe, the oil sleeve annulus channel is communicated with the oil pipe channel, and the accumulated liquid in the oil sleeve annulus channel gradually flows into the oil pipe channel and is discharged out of a shaft; carrying out statistics on shale gas well production dynamic parameters, analyzing the dispersion degree of oil pressure and gas production data, and when the standard deviation of oil pressure and gas production data points tends to 0, indicating that the oil pressure and the gas production are gradually stable and downhole effusion is discharged; gradually adjusting the opening of an oil sleeve annulus valve of the shale gas well, producing an oil sleeve annulus channel in a pure gas mode, enabling the oil sleeve annulus channel to be large in gas flow area and low in gas flow rate and incapable of carrying liquid, but not enabling liquid to be accumulated in the oil sleeve annulus channel, and enabling formation water to be discharged through the oil pipe channel due to the fact that the oil sleeve annulus channel is connected with the oil pipe channel; meanwhile, the yield of the oil pipe channel at the minimum pressure drop point is ensured to realize stable production and continuous liquid carrying, namely the stable production of the oil pipe at the minimum pressure drop point is maintained, liquid drainage is mainly used, and the flow area of the oil sleeve annular channel is large to assist in gas production.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117057283A (en) * | 2023-10-12 | 2023-11-14 | 西南石油大学 | Method for judging time spent in shale gas horizontal well oil pipe descending |
| CN117332723A (en) * | 2023-11-30 | 2024-01-02 | 西南石油大学 | Shale gas horizontal well shaft pressure drop calculation method |
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| CN117057283B (en) * | 2023-10-12 | 2024-01-26 | 西南石油大学 | Method for judging time spent in shale gas horizontal well oil pipe descending |
| CN117332723A (en) * | 2023-11-30 | 2024-01-02 | 西南石油大学 | Shale gas horizontal well shaft pressure drop calculation method |
| CN117332723B (en) * | 2023-11-30 | 2024-02-06 | 西南石油大学 | Shale gas horizontal well shaft pressure drop calculation method |
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