CN106640042A - Device and method for evaluating single well productivity of gas well - Google Patents
Device and method for evaluating single well productivity of gas well Download PDFInfo
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- CN106640042A CN106640042A CN201611205481.5A CN201611205481A CN106640042A CN 106640042 A CN106640042 A CN 106640042A CN 201611205481 A CN201611205481 A CN 201611205481A CN 106640042 A CN106640042 A CN 106640042A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000011435 rock Substances 0.000 claims abstract description 37
- 238000002474 experimental method Methods 0.000 claims abstract description 29
- 238000011156 evaluation Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 63
- 238000004088 simulation Methods 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 12
- 238000005065 mining Methods 0.000 claims description 5
- 238000003306 harvesting Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 239000003208 petroleum Substances 0.000 abstract 1
- 239000002356 single layer Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 123
- 239000010410 layer Substances 0.000 description 13
- 238000011084 recovery Methods 0.000 description 13
- 238000011161 development Methods 0.000 description 11
- 238000004458 analytical method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 2
- 230000021615 conjugation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a device for evaluating the single well productivity of a gas well. The device comprises a gas source and a constant-temperature box, a plurality of rock core holders are parallelly connected with the gas source, the inlet end of each rock core holder is connected with the gas source, standard gas cylinders are arranged between the rock core holders and the gas source, the outlet end of each rock core holder is connected with a back-pressure valve, rock cores are placed in the rock core holders, and the upper portions of the rock core holders are connected with ring pressure pumps; the back-pressure valves, the rock core holders and the standard gas cylinders are all located in the constant-temperature box. In the constant-temperature box, the formation temperature can be simulated for performing an experiment. The device and method can not only evaluate single-well single-layer productivity and single-well multilayer commingled productivity, but also can analyze the factors that affect the productivity of the single well. Compared with other methods, the device is easy to assemble, the method is easy to operate and the evaluation is more direct. In petroleum scientific research institutions and oil field laboratories, the device and method can be used as an experimental process for evaluating the single well productivity of the gas well and have a broad application prospect.
Description
Technical field
The present invention relates to assessment technique in oil and gas exploration and development process, is that a kind of simulation Single Gas Well exploitation is true
Determine a technology of the production capacity under different operating system, it is more particularly to a kind of to evaluate Single Gas Well energy generation device and method.
Background technology
Northern Shensi has many gas fields to belong to typical low porosity and low permeability gas reservoir, and these gas well individual layer production capacities are low, and individual layer is exploited past
Toward industrial production capacity is not reached, in order to obtain the production capacity of economy, and many gas wells are all produced by the way of commingling production, this
Planting development scheme can not only improve single well productivity, and can improve the development benefit in whole gas field.Commingling production is gone up at the scene
Using for many years, though in down-hole string, the aspects such as mode are adopted in conjunction has carried out compared with in-depth study, to commingling production seepage flow spy
Levy, the research of the aspect such as production forecast and rational proration it is relatively fewer, it is even more so especially in terms of low permeability gas reservoirs.Therefore it is right
For one specific gas reservoir, individual well commingling production development scheme there are still optimization space.
At present, when carrying out commingling production to individual well multilayer low permeability gas reservoirs, the research of its aerogenesis characteristic aspect mainly passes through
The methods such as numerical simulation, well test analysis, the pertinent literature for studying the problem using physical simulation experiment method is relatively little, Chengdu
Polytechnics Yang Peng had once carried out the research work of this aspect using long cores parallel connection oil reservoir Physical Experiment.
The exploitation in gas field be unable to do without the prediction to single well productivity, and the quality of single well productivity directly affects carrying for reservoir recovery ratio
It is high.The prediction for asking for Single Gas Well production capacity in the past is obtained by numerical simulation and well test analysis, by software computing, in advance
Survey single well capacity.Indoors the method by testing is asked for also without disclosed report, mainly lab simulation single well productivity
Technical comparing is complicated, the measuring apparatus for needing more precision very high, next to that personnel issue, understands experiment, is ignorant of situ extraction
Technology and to evaluating reservoir, and understand situ extraction and evaluating reservoir, experimental facilities is ignorant of, how the two organically to be combined,
It is the key of this inventive technique.
The present invention designs a set of single well productivity evaluation rubric by the combination of two technologies.
The content of the invention
The prediction for asking for Single Gas Well production capacity in the past is obtained by numerical simulation and well test analysis, is transported by software
Calculate, the single well capacity of prediction.Indoors the method by testing is asked for also without disclosed report, mainly lab simulation individual well
Energy output technology is more complicated, the measuring apparatus for needing more precision very high, next to that personnel issue, understands experiment, is ignorant of scene
Production technique and to evaluating reservoir, and understand situ extraction and evaluating reservoir, it is ignorant of experimental facilities.
In order to overcome the problems referred to above, the present invention to provide a kind of evaluation Single Gas Well energy generation device and method, set by experiment
Standby simulation and forecast goes out single well productivity, tries to achieve individual layer list and adopts and commingling production development model, evaluates the shadow of various production model production capacities
The recovery percent of reserves of reservoir units when the factor of sound and different abandonment pressures.By the present invention, the main of commingling production well production is studied
Influence factor, carries out reasonable working system optimization, under different reservoir feature conjugation condition, optimization reasonable production pressure, conjunction
Reason production capacity, reaches the final purpose for improving gas reservoir development benefit.By this invention, the factor of reserves exploitation that affects, system are found out
Determine reasonable production, optimized well pattern well spacing improves ultimate recovery；And by the research to pressure influence, further instruct multilayer
Whether increased drawdown is produced commingled producing well, improves the harmony of ductwork pressure.
The technical solution used in the present invention is：
One kind evaluates Single Gas Well energy generation device, including source of the gas and insulating box, is connected with multiple rock core folders on the source of the gas side by side
Holder, each described core holding unit entrance point is connected with source of the gas, and Standard Gases are additionally provided between core holding unit and source of the gas
Bottle, the port of export of each core holding unit is respectively connected with back-pressure valve, rock core, the rock is placed with the core holding unit
Heart clamp holder top is connected with ring press pump；The back-pressure valve, core holding unit, calibrating gas bottle are respectively positioned in insulating box.
The core holding unit two ends are equipped with pressure gauge, and the pressure gauge is located in insulating box.
The port of export of the back-pressure valve is provided with gas gauge, and the gas gauge is located at outside insulating box.
One kind evaluates Single Gas Well production capacity method, concretely comprises the following steps：
Step one is fitted into the core sample chosen in core holding unit；
Step 2 adds confined pressure using ring press pump to the rock core of experiment, simulates overlying rock pressure；
Step 3 opens source outlet pressure regulating valve, simulates gas reservoir barometric gradient, while opening calibrating gas bottle inlet valve and going out
Mouth valve, rock core add holder inlet valve, close rock core and add holder outlet valve, are rock core saturation testing gas, treat inlet end Standard Gases
After bottle is consistent with gas production end pressure, source of the gas valve 1.5-2. is closed 5 hours；
Step 4 simulates well head gas producing device with back-pressure valve, opens back-pressure valve, the size of outlet pressure is adjusted, during record experiment
Between, pressure, extraction gas flow, after gas production end pressure reaches gas reservoir abandonment pressure, back-pressure valve is fully opened, by residual gas
Body is all released, and draws the oil in place of whole simulated experiment gas reservoir, calculates the recovery ratio of different mining phases, and simulation exploitation is real
Test end.
In the step 2, the core holding unit after pressurization is heated by insulating box, and temperature setting is actual formation
Temperature.
In the step 3, gas reservoir barometric gradient is simulated, after inlet end volumetric standard is consistent with gas production end pressure, closed
Source of the gas valve stablizes 2 hours.
In the step 4, by pressure gauge test pressure.
The gas flow of extraction is measured in the step 4 by gas gauge.
Beneficial effects of the present invention are：
By this invention, individual layer list can be simulated and adopted and commingling production pattern, analyze impact of the different affecting factors to production capacity,
It is a kind of multi-functional flow process.It is applied in gas field commingling production gas well occurrence characteristics research within 2011, the flow process is from simulation
The angle of actual reservoir and gas reservoir evaluation understands the principal element and secondary cause played a decisive role to payzone contribution, optimizes gas
Well rational proration, can provide strong technical support and guarantee for the target of gas field development middle and later periods steady production.Simultaneously.Look for
Go out to affect the factor of reserves exploitation, formulate reasonable production, optimized well pattern well spacing improves ultimate recovery；And by pressure shadow
Loud research, whether increased drawdown is produced further to instruct multicompletion well, improves the harmony of ductwork pressure.
It is further detailed below with reference to accompanying drawing.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
In figure, reference is：1st, gas gauge；2nd, back-pressure valve；3rd, pressure gauge；4th, rock core；5th, core holding unit；6th, ring pressure
Pump；7th, calibrating gas bottle；8th, source of the gas；9th, insulating box；A, inlet valve；B, outlet valve.
Specific embodiment
Embodiment 1：
The prediction for asking for Single Gas Well production capacity in the past is obtained by numerical simulation and well test analysis, by software computing,
The single well capacity of prediction.Indoors the method by testing is asked for also without disclosed report, and mainly lab simulation individual well is produced
Energy Technical comparing is complicated, the measuring apparatus for needing more precision very high, next to that personnel issue, understands experiment, the scene of being ignorant of is opened
Adopt technology and to evaluating reservoir, and understand situ extraction and evaluating reservoir, be ignorant of experimental facilities.
In order to overcome the problems referred to above, the present invention to provide one kind as shown in Figure 1 and evaluate Single Gas Well energy generation device and method,
Single well productivity is gone out by experimental facilities simulation and forecast, individual layer list is tried to achieve and is adopted and commingling production development model, evaluate various exploitation moulds
The recovery percent of reserves of reservoir units when the influence factor of type production capacity and different abandonment pressures.By the present invention, multicompletion well is studied
The major influence factors of yield, carry out reasonable working system optimization, and under different reservoir feature conjugation condition, optimization is rationally given birth to
Pressure reduction, rational productivity are produced, the final purpose for improving gas reservoir development benefit is reached.By this invention, impact reserves exploitation is found out
Factor, formulate reasonable production, optimized well pattern well spacing, improve ultimate recovery；And by the research to pressure influence, further
Whether increased drawdown is produced to instruct multicompletion well, improves the harmony of ductwork pressure.
One kind evaluates Single Gas Well energy generation device, including source of the gas 8 and insulating box 9, is connected with side by side on the source of the gas 8 multiple
Core holding unit 5, each described entrance point of core holding unit 5 is connected with source of the gas 8, also sets between core holding unit 5 and source of the gas 8
Calibrating gas bottle 7 is equipped with, the port of export of each core holding unit 5 is respectively connected with back-pressure valve 2, the core holding unit 5 to be put
Rock core 4 is equipped with, the top of the core holding unit 5 is connected with ring press pump 6；The back-pressure valve 2, core holding unit 5, calibrating gas bottle 7
In being respectively positioned on insulating box 9.
In the present invention, source of the gas 8 provides air inlet, and ring press pump 6 is pressurizeed to rock core 4, simulates the pressure required for its experiment,
Back-pressure valve 2 simulates well head recovery pressure by deflating.The effect of calibrating gas bottle 7 is, using ripple horse law, to calculate and opened in reservoir
Adopt before and after gas gross.Insulating box 9 can simulate it is various in the case of temperature, can in time simulate real-time formation temperature.The present invention can
Adopted and commingling production pattern with simulating individual layer list, analyze impact of the different affecting factors to production capacity, be a kind of multi-functional flow process.
It is applied in the research of gas field commingling production gas well occurrence characteristics within 2011, the flow process is from simulation actual reservoir and gas reservoir evaluation
Angle understands the principal element and secondary cause played a decisive role to payzone contribution, optimizes gas well rational proration, can be gas
The target of field mid-later development phase steady production provides strong technical support and guarantee.Simultaneously.Find out affect reserves exploitation because
Element, formulates reasonable production, and optimized well pattern well spacing improves ultimate recovery；And by the research to pressure influence, further instruct
Whether increased drawdown is produced multicompletion well, improves the harmony of ductwork pressure.
Embodiment 2：
On the basis of above-described embodiment, in the present embodiment, the two ends of the core holding unit 5 are equipped with pressure gauge 3, the pressure
Power table 3 is located in insulating box 9.
The port of export of the back-pressure valve 2 is provided with gas gauge 1, and the gas gauge 1 is located at outside insulating box 9.
A kind of evaluation Single Gas Well production capacity method is provided in the present embodiment, is concretely comprised the following steps：
Step one is fitted into the sample of rock core 4 chosen in core holding unit 5；
Step 2, to the rock core 4 plus confined pressure of experiment, simulates overlying rock pressure using ring press pump 6；
Step 3 opens the outlet valve b of source of the gas 8 and adjusts pressure, simulates gas reservoir barometric gradient, while opening the inlet valve a of calibrating gas bottle 7
Add the inlet valve a of holder 5 with outlet valve b, rock core, close rock core and add the outlet valve b of holder 5, be the saturation testing gas of rock core 4, treat into
After gas end calibrating gas bottle 7 is consistent with gas production end pressure, source of the gas valve 1.5-2. is closed 5 hours；
Step 4 simulates well head gas producing device with back-pressure valve 2, opens back-pressure valve 2, adjusts the size of outlet pressure, record experiment
Time, pressure, the gas flow of extraction, after gas production end pressure reaches gas reservoir abandonment pressure, fully open back-pressure valve 2, will be residual
Residual air body is all released, and draws the oil in place of whole simulated experiment gas reservoir, calculates the recovery ratio of different mining phases, and simulation is opened
Adopt experiment to terminate.
In the step 2, the core holding unit 5 after pressurization is heated by insulating box 9, and temperature setting is for practically
Layer temperature.
In the step 3, gas reservoir barometric gradient is simulated, after inlet end volumetric standard is consistent with gas production end pressure, closed
Source of the gas valve stablizes 2 hours.
In the step 4, by the test pressure of pressure gauge 3.
The gas flow of extraction is measured in the step 4 by gas gauge 1.
The present invention is, by gas reservoir micro, to design different stratigraphic model flow processs, and the interior for carrying out individual layer and commingling production is real
Test, by the multilayer under the conditions of different producing pressure differentials, different permeability extreme differences, different gas saturation, different reservoir combination etc.
The laboratory experiment that conjunction is adopted, analysis commingling production interlayer yield effect and interlayer interference, and ultimate recovery is evaluated, from reality
The angle tested summarizes the major control factors and secondary governing factor affected on commingling production gas well interlayer occurrence characteristics.
This experiment flow is adopted and commingling production experiment by carrying out individual layer list, before experiment, need to be according to actual formation parameter
Select suitable experimental simulation parameter value so that each parameter is close to research area stratum truth, to guarantee the standard of experimental result
True property and applicability.
Individual layer list adopts experimental procedure：
1. first by choose sample is fitted in core holding unit 5, using ring press pump 6 to experiment rock core 4 add confined pressure, overlying strata in simulation
Stone pressure, is heated by insulating box 9 to core holding unit 5, and temperature setting is actual formation temperature.
2. source of the gas valve 8 is opened, is the saturation testing gas of rock core 4, simulate gas reservoir barometric gradient, treat inlet end calibrating gas bottle 7
After consistent with gas production end pressure, the stable 1.5-2.5 hours of source of the gas valve are closed.This step is to utilize Bo Madingli, in calculating reservoir
Gas gross before and after exploitation.
3. well head gas producing device is simulated with back-pressure valve 2, open back-pressure valve 2, the size of outlet pressure is adjusted, during record experiment
Between, pressure, extraction gas flow, after gas production end pressure reaches gas reservoir abandonment pressure, back-pressure valve 2 is fully opened, by remnants
Gas is released, and draws the oil in place of whole simulated experiment gas reservoir, calculates the recovery ratio of different mining phases, simulates extracting experiment
Terminate.Flow process can analyze the influence factor of single well productivity, such as strata pressure, exploitation by changing different experimental conditions
Flow velocity, gas reservoir water saturation, burden pressure, the anisotropism of reservoir.
Commingling production experimental procedure：
1. first the rock core 4 for having marked is respectively charged in the core holding unit 5 of parallel connection, by insulating box to core holding unit 5 plus
Heat, temperature setting is actual formation temperature.Source of the gas valve 8 is opened, is the saturation testing gas of rock core 4, simulate gas reservoir barometric gradient, treated
After inlet end volumetric standard 7 is consistent with gas production end pressure, the stable 1.5-2.5 hours of source of the gas valve are closed.
2. well head gas producing device is simulated with back-pressure valve 2, required according to experimental design, control different unlatching opportunitys, simulation
The conjunction of gas reservoir initial stage is adopted and different opportunity payzones are closed and adopt the mode of production taken over, and records experimental pressure, time, the gas flow of extraction
Data, evaluate different conjunction and adopt impact of the mode to gas reservoir development effect.
3. gas production end pressure is reached after gas reservoir abandonment pressure, fully opens back-pressure valve 2, and residual gas is released, and is united respectively
The oil in place of each layer simulated experiment gas reservoir is counted, the recovery ratio of each mining phase is calculated, simulation extracting experiment terminates.Flow process can be with
Exploitation pattern in simulation interlayer and layer.
The present invention is a kind of flow process of brand-new evaluation Single Gas Well production capacity.It can not only evaluate individual well individual layer list and adopt and many
The laminated production capacity adopted, and can also analyzing influence single well productivity influence factor.Compared with additive method, it is easily assembled, it is easy to operate,
Evaluate more direct.In oil scientific research institutions and oil field laboratory, can be right as the experiment flow for evaluating Single Gas Well production capacity
It is also a kind of support study dies means that other research institutions evaluate the production capacity of reservoir.Have a extensive future.
Claims (8)
- It is 1. a kind of to evaluate Single Gas Well energy generation device, it is characterised in that：Including source of the gas（8）And insulating box（9）, the source of the gas（8） On be connected with multiple core holding units side by side（5）, described each core holding unit（5）Entrance point and source of the gas（8）Connection, rock core Clamper（5）With source of the gas（8）Between be additionally provided with calibrating gas bottle（7）, described each core holding unit（5）The port of export be all connected with There is back-pressure valve（2）, the core holding unit（5）Inside it is placed with rock core（4）, the core holding unit（5）Top is connected with ring pressure Pump（6）；The back-pressure valve（2）, core holding unit（5）, calibrating gas bottle（7）It is respectively positioned on insulating box（9）In.
- 2. one kind according to claim 1 evaluates Single Gas Well energy generation device, it is characterised in that：The core holding unit （5）Two ends are equipped with pressure gauge（3）, the pressure gauge（3）Positioned at insulating box（9）In.
- 3. one kind according to claim 1 evaluates Single Gas Well energy generation device, it is characterised in that：The back-pressure valve（2）'s The port of export is provided with gas gauge（1）, the gas gauge（1）Positioned at insulating box（9）Outward.
- 4. any one according to claim 1-3 evaluates Single Gas Well energy generation device and provides a kind of evaluation Single Gas Well product Energy method, it is characterised in that：Concretely comprise the following steps：The rock core that step one will be chosen（4）Sample loads core holding unit（5）In；Step 2 uses ring press pump（6）To the rock core of experiment（4）Plus confined pressure, simulate overlying rock pressure；Step 3 opens source of the gas（8）Outlet valve（b）Pressure is adjusted, gas reservoir barometric gradient is simulated, while opening calibrating gas bottle （7）Inlet valve（a）And outlet valve（b）, rock core add holder（5）Inlet valve（a）, close rock core and add holder（5）Outlet valve（b）, it is Rock core（4）Saturation testing gas, treats inlet end calibrating gas bottle（7）After consistent with gas production end pressure, source of the gas valve 1.5-2. 5 is closed Hour；Step 4 back-pressure valve（2）Simulation well head gas producing device, opens back-pressure valve（2）, adjust the size of outlet pressure, record Experimental period, pressure, the gas flow of extraction, after gas production end pressure reaches gas reservoir abandonment pressure, fully open back-pressure valve （2）, residual gas is all released, the oil in place of whole simulated experiment gas reservoir is drawn, calculate the harvesting of different mining phases Rate, simulation extracting experiment terminates.
- 5. one kind according to claim 4 evaluates Single Gas Well production capacity method, it is characterised in that：In the step 2, plus Core holding unit after pressure（5）By insulating box（9）Heated, temperature setting is actual formation temperature.
- 6. one kind according to claim 4 evaluates Single Gas Well production capacity method, it is characterised in that：In the step 3, mould Intend gas reservoir barometric gradient, after inlet end volumetric standard is consistent with gas production end pressure, closes source of the gas valve and stablize 2 hours.
- 7. one kind according to claim 4 evaluates Single Gas Well production capacity method, it is characterised in that：In the step 4, lead to Excess pressure table（3）Test pressure.
- 8. one kind according to claim 4 evaluates Single Gas Well production capacity method, it is characterised in that：Pass through in the step 4 Gas gauge（1）The gas flow of metering extraction.
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| CN201611205481.5A CN106640042A (en) | 2016-12-23 | 2016-12-23 | Device and method for evaluating single well productivity of gas well |
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