CN108627417A - The test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir - Google Patents
The test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir Download PDFInfo
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- CN108627417A CN108627417A CN201810503993.2A CN201810503993A CN108627417A CN 108627417 A CN108627417 A CN 108627417A CN 201810503993 A CN201810503993 A CN 201810503993A CN 108627417 A CN108627417 A CN 108627417A
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- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
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Abstract
The invention discloses the test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir, include the following steps：Live natural gas, stratum water sampling；Temperature and pressure are adjusted to specified temperature and pressure point, gas solubility data in water flooding are obtained；PVT constant temperature and pressure condition lower volume sizes before and after water sample are quantitatively injected in monitoring, and temperature, pressure are recorded after stablizing, after be adjusted to next temperature and pressure point, and measure the multigroup experimental data of acquisition；It builds and is saturated water vapour content computation model in natural gas, bring temperature, pressure, bulking value that experiment measures into saturated steam content calculation model, obtain the natural gas saturated steam content under different temperatures and pressure.High temperature and pressure natural gas saturated steam content accurately can be measured and be calculated with this method, while the demand to sample is few, metering is convenient and efficient, and metric results are reliable, which has stronger versatility.
Description
Technical field
The present invention relates to the streams that in a kind of oil-gas exploration and development technology, high temperature and pressure gas reservoir condensation water content is tested and calculated
The acquisition methods of water vapour content in body assessment technique, in particular to high temperature and pressure reservoir.
Background technology
High temperature and pressure gas reservoir is influenced by reservoir environment, and saturation has a certain amount of water flooding in natural gas, as failure is opened
The cooling release of natural gas during adopting can cause saturation steam content in natural gas to change, generate condensation water.In order to bright
True gas reservoir condensation water precipitation mechanism is provided fundamental basis, it is necessary to understand fully for the anticipation of condensation water hydrops risk and prevention and control countermeasure
The size variation rule of gas reservoir and pit shaft inside natural gas condensation water content under different Temperature-pressure Conditions in production process.Due to gas
Condensation water content often not necessarily can be especially high in phase, while further relating to high temperature and pressure, therefore the test of condensation water content is to instrument
Precision and instrument temperature and pressure performance requirement are very high.However conventional test methodologies have following intrinsic defect：(1) it is needed when measuring
A large amount of samplings, since condensation water content is smaller in gas phase, will reduce error, while reaching the test scope of balance, need from PVT
Cylinder lower end largely samples, and causes experiment material waste larger, and cost increases, and sample and sample transfer number increase；(2) liquid in pipeline
Water causes error big, due to being related to constant temperature and pressure sample transfer, necessarily refers to connecting pipeline during sample transfer, inevitable face in experimentation
Lin Ningxishui is precipitated to influence condensation water content final test precision in pipeline；(3) pipeline dead volume causes error big, surveys
Various pipelines will lead to a certain amount of dead volume in examination flow, and it is gentle that dead volume can cause to be difficult to accurately to detect condensation water quality
Body volume, so that natively relatively low condensation water content can be lower, error becomes larger.
Invention content
It is accurate evaluation high temperature and pressure gas reservoir condensation water content and variation for these intrinsic defects of conventional test methodologies
Rule, the technical solution adopted in the present invention are：The test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir,
Include the following steps：
S1, gas well at HTHP sampling fluids：Using sample apparatus high temperature and pressure gas is obtained from high temperature and pressure gas field well site
Well fluids sample；
S2 obtains gas solubility data in water flooding：Injecting water flooding and natural gas, stirred sample to PVT instrument makes
Inner barrel temperature and pressure are balanced to test point temperature and pressure state, are sampled from PVT instrument lower end, and sample is cooled down and is precipitated in sampler
Water Soluble Gas passes through testing flow meter water-soluble tolerance by electronic balance formation testing water.
S3 obtains multigroup PVT cylinders volume data：Appropriate natural gas is added to PVT instrument, monitors gas well at HTHP fluid-like
Volume of the product under target temperature, pressure, record temperature, pressure, volume after balance；Appropriate water flooding is added to PVT, changes
Temperature, record temperature, pressure, volume after balance；Obtain the multi-group data being made of volume, temperature parameter and pressure parameter；
S4 builds and is saturated water vapour content calculation formula in natural gas：It at high temperature under high pressure can be most using gas sample and water sample
Reach air water balance eventually, the state change before and after water sample is added according to gas sample under constant Temperature-pressure Conditions, is based on material balance principle
It builds and is saturated water vapour content calculation formula in natural gas；
S5 obtains condensation water content：According under the conditions of constant temperature and pressure monitor natural gas injection water flooding before and after volume,
In conjunction with gas solubility test result in water flooding, you can accurately calculate natural gas saturated steam content.
As the preferred technical solution of the present invention, the step S2, S3 are measured in experiment, and equipment used is more
Function high-temperature, high pressure fluid PVT analyzers.
As the preferred technical solution of the present invention, in the step S2, gas solubility measures in water flooding
When inject excessive natural gas to PVT instrument and measure natural gas filling using high-precision gas flowmeter and enter amount.
As the preferred technical solution of the present invention, in the step S3, multi-group data is according to the temperature and pressure model of reservoir
Setting is enclosed, upper limit temperature and pressure are reservoir temperature and pressure, and 10 DEG C of temperature interval, low temperature widens interval.
Water vapour content is saturated as the preferred technical solution of the present invention, in the step 4, in natural gas to calculate
Formula is as follows：Wherein Vw is to be saturated water vapour content, mol/ in natural gas
mol；P is pressure, MPa；Wg is saturated steam volume in natural gas；V1 is stable volume under the conditions of natural gas constant temperature and pressure,
ml；W injects constant pressure and injects stratum water volume；The molal weight of Mw water；R is mol gas constant；Vg is natural gas in water flooding
Content, ml；P is designated as standard state pressure, MPa.
Beneficial effects of the present invention：It is proved by actual production validity check, acquisition can be significantly improved using this method
The accuracy of high temperature and pressure gas reservoir condensation water content, and then the prediction of high temperature and pressure gas reservoir condensation water content is improved based on experimental result
Precision, have stronger versatility.The present invention provides more preferable more acurrate for the acquisition of high temperature and pressure gas field condensation water content
Method.
Description of the drawings
Invention is further described in detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the flow chart of the present invention.
Specific implementation mode
As shown in Figure 1, the test of condensation water content and calculating side under the conditions of a kind of high temperature and pressure gas reservoir described in the present embodiment
Method, it includes the following steps：
S1, gas well at HTHP sampling fluids：Using sample apparatus high temperature and pressure gas is obtained from high temperature and pressure gas field well site
Well fluids samples include stratum water sample and natural gas sample；
S2 obtains gas solubility data in water flooding：1. injecting excessive water flooding and natural gas to PVT instrument；2. will
PVT temperature are adjusted to test temperature point；3. PVT pressure are adjusted to test pressure point；4. PVT instrument constant pressures, stirred sample,
Inner barrel temperature and pressure are made to balance to test point temperature and pressure state；5. constant voltage mode is from PVT instrument lower end water sampling, test natural gas is on ground
Solubility in layer water；6. adjusting next group of temperature and pressure, 2. -5. experimentation is repeated；7. obtaining being joined by solubility, temperature
The multi-group data that number and pressure parameter are constituted.
S3 obtains multigroup PVT cylinders volume data：Appropriate natural gas first is added toward PVT instrument, monitors gas well at HTHP fluid
Volume of the sample under target temperature, pressure, record temperature, pressure, volume after balance；Then appropriate stratum is added to PVT
Water measures PVT cylinders product under set temperature and pressure, obtains being made of volume, temperature parameter and pressure parameter more respectively
Group data；
S4 builds and is saturated water vapour content calculation formula in natural gas：It at high temperature under high pressure can be most using gas sample and water sample
Reach air water balance eventually, the state change before and after water sample is added according to gas sample under constant Temperature-pressure Conditions, is based on material balance principle
It builds and is saturated water vapour content calculation formula in natural gas.
Its specific implementation step is as follows：Since gas sample and water sample can be finally reached air water balance at high temperature under high pressure, in gas
Main during water balance that two variations occur, part water sample evaporates into gas sample and gas sample dissolving in part enters water sample.Therefore,
Volume of the gas sample under target temperature, pressure can be monitored, quantitative water sample is then added, volume change is monitored after balance.Respectively
Part variation can be calculated in accordance with the following methods.Assuming that under the conditions of constant temperature and pressure：
It is Vw, mol/mol that water vapour content is saturated in natural gas；
Natural Gas content is Vg, ml in water flooding；
Stable volume is V1, ml under the conditions of natural gas constant temperature and pressure；
Constant pressure is injected stratum water volume and is injected for W, ml；
Volume is V2, ml after stablizing under same temperature and pressure after injection water flooding；
Inject liquid storage amount after water flooding constant temperature and pressure balances：L, ml；
The natural gas volume being dissolved into water flooding：Gw, ml；
Saturated steam volume in natural gas：Wg, ml；
The compressed coefficient of water is：Cw ,/MPa；
The molal weight of water：Mw, g/mol.
Therefore, PVT volume changes are after water sample is added in constant temperature and pressure：
Δ V=V2-V1=steam vapour amount-water-soluble tolerance+liquid storage amount=Wg-Gw+L(1)
Saturated steam volume is in natural gas：
Wg=(dry gas volume-water-soluble air volume) × Vw=(V1-Gw)×Vw(2)
The natural gas volume being dissolved into water flooding is：
After air water balance, PVT internal liquid volumes (liquid storage amount) are：
Due to injecting volume of water sample very little itself, the corresponding very little of dissolving gas sample volume, volume smaller after water-soluble liquid state, body
Product can be ignored, therefore simultaneous equations (1) to (4) can obtain saturated steam volume in natural gas and be：
Water vapour content is saturated in natural gas is：
Natural gas can be calculated in spy by PVT constant temperature and pressure condition lower volume sizes before and after monitoring quantitatively injection water sample
Determine the condensation water content under Temperature-pressure Conditions.
S5 obtains condensation water content：According under the conditions of constant temperature and pressure monitor natural gas injection water flooding before and after volume,
In conjunction with gas solubility test result in water flooding, you can accurately calculate natural gas saturated steam content.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to the technical essence of the invention
To any simple modification, equivalent change and modification made by above example, in the range of still falling within technical solution of the present invention.
Claims (5)
1. the test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir, which is characterized in that include the following steps：
S1, gas well at HTHP sampling fluids：Using sample apparatus gas well at HTHP stream is obtained from high temperature and pressure gas field well site
Body sample；
S2 obtains gas solubility data in water flooding：Water flooding and natural gas are injected to PVT instrument, makes inner barrel temperature and pressure
Balance is sampled from PVT instrument lower end to test point temperature and pressure state, and sample is cooled down in sampler and be precipitated Water Soluble Gas, is passed through
Electronic balance formation testing water, passes through testing flow meter water-soluble tolerance；
S3 obtains multigroup PVT cylinders volume data：Appropriate natural gas is added to PVT instrument, monitoring gas well at HTHP fluid sample exists
Volume under target temperature, pressure, record temperature, pressure, volume after balance；Appropriate water flooding is added to PVT, changes temperature
It spends, record temperature, pressure, volume after balance；Obtain the multi-group data being made of volume, temperature parameter and pressure parameter；
S4 builds and is saturated water vapour content calculation formula in natural gas：It can finally be reached at high temperature under high pressure using gas sample and water sample
It is balanced to air water, the state change before and after water sample is added according to gas sample under constant Temperature-pressure Conditions, is built based on material balance principle
Water vapour content calculation formula is saturated in natural gas；
S5 obtains condensation water content：According under the conditions of constant temperature and pressure monitor natural gas injection water flooding before and after volume, in conjunction with
Gas solubility test result in water flooding, you can accurately calculate natural gas saturated steam content.
2. the test of condensation water content and computational methods, special under the conditions of a kind of high temperature and pressure gas reservoir according to claim 1
Sign is：The step S2, S3 are measured in experiment, and equipment used is multifunctional high-temperature high-pressure fluid PVT analyzers.
3. the test of condensation water content and computational methods, special under the conditions of a kind of high temperature and pressure gas reservoir according to claim 1
Sign is：In the S2, natural gas is injected to PVT instrument when gas solubility measures in water flooding and use high-precision gas
Flowmeter measures natural gas filling and enters amount.
4. the test of condensation water content and computational methods, special under the conditions of a kind of high temperature and pressure gas reservoir according to claim 1
Sign is：In the step 3, multi-group data is set according to the temperature and pressure range of reservoir, and upper limit temperature and pressure are reservoir temperature and pressure, temperature interval
10 DEG C, low temperature widens interval, pressure intervals 10MPa.
5. the test of condensation water content and computational methods under the conditions of a kind of high temperature and pressure gas reservoir according to claim 1,
It is characterized in that, it is as follows to be saturated water vapour content calculating formula in step s 4, in natural gas：
Wherein Vw is to be saturated water vapour content, mol/mol in natural gas；P is pressure, MPa；Wg is saturated steam in natural gas
Volume；V1 is stable volume under the conditions of natural gas constant temperature and pressure, ml；W injects constant pressure and injects stratum water volume；Mole matter of Mw water
Amount；R is mol gas constant；Vg is natural Gas content in water flooding, ml；P is designated as standard state pressure, MPa.
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Cited By (4)
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| CN110378075A (en) * | 2019-08-19 | 2019-10-25 | 西南石油大学 | A kind of acid and nonacid natural gas water content amount prediction technique |
| CN111257533A (en) * | 2020-02-13 | 2020-06-09 | 西南石油大学 | Method for measuring content of water vapor in natural gas |
| CN115788385A (en) * | 2022-12-29 | 2023-03-14 | 西南石油大学 | Method for determining condensate water-gas ratio of high-temperature condensate gas reservoir |
| CN117009718A (en) * | 2023-10-07 | 2023-11-07 | 西南石油大学 | Water supplementing quantity calculation model and method for preventing salt formation of gas storage |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110378075A (en) * | 2019-08-19 | 2019-10-25 | 西南石油大学 | A kind of acid and nonacid natural gas water content amount prediction technique |
| CN110378075B (en) * | 2019-08-19 | 2022-02-25 | 西南石油大学 | Method for predicting water content of acidic and non-acidic natural gas |
| CN111257533A (en) * | 2020-02-13 | 2020-06-09 | 西南石油大学 | Method for measuring content of water vapor in natural gas |
| CN115788385A (en) * | 2022-12-29 | 2023-03-14 | 西南石油大学 | Method for determining condensate water-gas ratio of high-temperature condensate gas reservoir |
| CN115788385B (en) * | 2022-12-29 | 2024-05-24 | 西南石油大学 | Determination method for condensate water-gas ratio of high Wen Ningxi gas reservoir |
| CN117009718A (en) * | 2023-10-07 | 2023-11-07 | 西南石油大学 | Water supplementing quantity calculation model and method for preventing salt formation of gas storage |
| CN117009718B (en) * | 2023-10-07 | 2023-12-12 | 西南石油大学 | Water supplementing quantity calculation model and method for preventing salt formation of gas storage |
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