CN101012747A - Gas-liquid ratio control method of rock core displacement test - Google Patents
Gas-liquid ratio control method of rock core displacement test Download PDFInfo
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- CN101012747A CN101012747A CN 200710013469 CN200710013469A CN101012747A CN 101012747 A CN101012747 A CN 101012747A CN 200710013469 CN200710013469 CN 200710013469 CN 200710013469 A CN200710013469 A CN 200710013469A CN 101012747 A CN101012747 A CN 101012747A
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Abstract
The invention provides a gas-liquid ratio control method in oil core flooding experiment. A back pressure valve is added at the position of core outlet to control the outlet pressure. At the position of core inlet displacement fluid is injected to control the injecting speed by a metering pump through a middle container. Based on the foundation, pressure sensors are set on the liquid container and gas container respectively to monitor the change of liquid pressure and gas pressure in time. At the same time air booster pump and compensation air source are connected on the air container. When the difference of liquid pressure and air pressure is more than the setting value, the air booster pump is started automatically to supercharge air so that the air pressure is equal to the liquid pressure and it is guaranteed that air can be injected so that the actual displacement of air is equal to the setting displacement and the gas-liquid injecting proportion can be controlled accurately.
Description
Technical field:
The present invention relates to a kind of method of controlling IGLR example in the experimentation, control especially for the gas liquid ratio in the oil rock core displacement test.
Background technology:
In the oil development process, often need carry out the laboratory core displacement test, estimate oil displacement efficiency and fluid properties.In needing the rock core displacement test of gas injection, as foam flooding experiment or aerated water displacement of reservoir oil experiment, the general gas injection rate that needs under the metering certain pressure, or control gas liquid ratio are to control experiment parameter comparatively accurately, to reduce the error of testing.The common experimental method is to install back-pressure valve additional in the rock core exit, the control outlet pressure, and the core entry place adopts mass-flow gas meter or goes into displacement fluid control injection rate by intermediate receptacle with the metering infusion.But pressure is constantly to change in the displacement process, and the flow of mass-flow gas meter is difficult to control under experiment condition; Adopt intermediate receptacle to go into the actual injection rate that method that displacement fluid controls injection rate then can not better controlled gas with the metering infusion, reason is that gas has compressibility, and liquid is incompressible basically, gas pressure change is slower, often be in state, cause gas not inject less than displacement pressure.Under the situation that measuring pump constant current amount is injected, the actual displacement of gas is unequal with the setting discharge capacity like this, and the displacement fluid that measuring pump injects has quite a few to be used for the Compressed Gas volume.Therefore above-mentioned two kinds of methods exist aspect gas dosing than mistake, can not the better controlled gas liquid ratio.
Summary of the invention:
The objective of the invention is and under experiment condition, can control gas injection rate and gas liquid ratio comparatively accurately, to reduce experimental error.
The object of the present invention is achieved like this: install back-pressure valve additional in the rock core exit, the control outlet pressure, the core entry place goes into displacement fluid control injection rate by intermediate receptacle with the metering infusion, on this basis, a pressure sensing respectively is installed on liquid storage container and air container respectively, real-time monitoring liquid pressure and variation of gas pressure, on air container, connect gas boosting pump and additional source of the gas simultaneously, when the difference of fluid pressure and gas pressure during greater than setting value, then start the gas boosting pump automatically and give gas boosting, gas pressure and fluid pressure are consistent, guarantee that gas can inject, thereby make the actual displacement of gas consistent, accurately control gas-liquid and inject ratio with the setting discharge capacity.
Because liquid is incompressible basically, its pressure has just directly reflected displacement pressure, and gas has very big compressibilty, usually is lower than displacement pressure under the concurrently injected situation of gas-liquid, causes gas not inject.Thereby make the actual displacement of gas inconsistent with the setting discharge capacity, because the present invention respectively installs a pressure sensing on liquid storage container and air container, real-time monitoring liquid pressure and variation of gas pressure, be connected gas boosting pump and additional source of the gas on the air container simultaneously, can give the air container supercharging automatically, gas pressure and fluid pressure can be consistent constantly, just can realize that the actual displacement of gas is consistent with the setting discharge capacity, meet the requirements of gas liquid ratio, with better control experiment parameter.
Description of drawings:
Fig. 1 is according to the designed experiment flow figure of gas-liquid ratio control method in the rock core displacement test provided by the present invention.
Among the figure, 1-gas cylinder, 2-gas boosting pump, 3-electromagnetic valve, 4-ball-and-seat, 5-measuring pump, the 6-measuring pump, 7-air container, 8-liquid storage container, 9-pressure sensor, 10-pressure sensor, the 11-displacement fluid, 12-displacement fluid, 13-air and liquid mixer, 14-rock core model, 15-back-pressure valve.
The specific embodiment:
Describe the present invention in detail below in conjunction with drawings and Examples.
Shown in Figure 1, gas and liquid inject displacement fluid control injection rate by measuring pump 5 and measuring pump 6 respectively, and gas-liquid is mixed the back by air and liquid mixer 13 and injected rock core model 14, and 14 outlets of rock core model prevent the gas channelling by back-pressure valve 15 control back pressure.A pressure sensor 8,9 respectively is housed on air container 7 and the liquid storage container 8 monitors its pressure variation, air container 7 outlets are connected to ball-and-seat 4, prevent that liquid from entering air container 7, air container 7 also links to each other with gas boosting pump 2 in addition, when gas pressure during less than the fluid pressure certain value, then to open by computer control electromagnetic valve 3, gas boosting pump 2 starts automatically, give gas boosting, make gas-liquid pressure reach balance again.
Embodiment: in the foam flooding experiment, need the control gas-liquid to inject ratio, to guarantee the foam property parameter.There is not gas pressure to detect and automatic function of increasing pressure in the control method commonly used.Like this, along with the injection of foam, displacement pressure raises, because liquid is incompressible substantially, supercharging is very fast, and fluid pressure has promptly reflected displacement pressure, and gas has very big compressibilty, and pressure rises slower.Like this, gas pressure will cause having only liquid to inject less than fluid pressure, and the situation that gas can not inject, thereby changed IGLR example and foam parameter.Adopt method of the present invention, during less than the fluid pressure certain value, then open by the computer control electromagnetic valve at gas pressure, the gas boosting pump starts automatically, give gas boosting, gas pressure and fluid pressure are consistent, guarantee that the actual injection rate of gas is consistent with the setting discharge capacity.Thereby control experiment parameter preferably, reduce experimental error.
Claims (1)
1. one kind is used for the method that oil rock core displacement test gas liquid ratio is controlled, by installing back-pressure valve additional in the rock core exit, the control outlet pressure, the core entry place goes into displacement fluid control injection rate by intermediate receptacle with the metering infusion, it is characterized in that on air container and liquid storage container, respectively being equipped with a pressure sensor and monitor its pressure variation, air container connects gas boosting pump and additional source of the gas, when gas pressure is lower than the fluid pressure certain value, then open electromagnetic valve by computer, automatically start the gas boosting pump and give gas boosting, gas pressure and fluid pressure are consistent, guarantee that the actual injection rate of gas is consistent with the setting discharge capacity.
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| CN 200710013469 CN101012747A (en) | 2007-02-02 | 2007-02-02 | Gas-liquid ratio control method of rock core displacement test |
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| CN 200710013469 CN101012747A (en) | 2007-02-02 | 2007-02-02 | Gas-liquid ratio control method of rock core displacement test |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644459A (en) * | 2012-04-05 | 2012-08-22 | 西南石油大学 | Device and method for determining molecular diffusion coefficient of multi-component gas-liquid system in rock core |
| CN102809975A (en) * | 2012-07-06 | 2012-12-05 | 中国石油天然气股份有限公司 | Automatic tracking control device and method for gas-liquid ratio of high-pressure foam profile control object model experiment |
| CN102865899A (en) * | 2012-09-07 | 2013-01-09 | 中国石油天然气集团公司 | In-situ fluid volume measuring method for use in high-temperature and high-pressure rock core displacement process and device thereof |
| CN103015993A (en) * | 2012-11-30 | 2013-04-03 | 中国石油天然气股份有限公司 | Water-gas dispersion injection device for core gas injection displacement experiment |
| CN103899303A (en) * | 2012-12-25 | 2014-07-02 | 中国石油天然气股份有限公司 | Medium mixed injection device and medium mixed injection process |
| CN104405377A (en) * | 2014-12-02 | 2015-03-11 | 东北石油大学 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
| CN104912525A (en) * | 2015-05-11 | 2015-09-16 | 中国石油大学(北京) | Oil-displacement experimental device used for low-permeability sandstone oil reservoir and oil-displacement experimental method used for low-permeability sandstone oil reservoir |
| CN104948134A (en) * | 2015-06-30 | 2015-09-30 | 安东柏林石油科技（北京）有限公司 | Storage-type precise quantitative oil-gas well down-hole work agent injection system and injection method |
| CN105841775A (en) * | 2016-05-16 | 2016-08-10 | 中国石油天然气股份有限公司 | Water-producing gas well accumulated liquid pre-judgment experimental device and method |
| CN109142128A (en) * | 2018-07-26 | 2019-01-04 | 中国石油天然气股份有限公司 | Dynamic scaling simulation experiment method and device for underground production equipment of ASP flooding oil well |
| CN109632557A (en) * | 2019-01-22 | 2019-04-16 | 中国矿业大学 | A kind of gas-liquid two-phase saturation coal petrography sample experimental provision and saturation degree test method |
| CN112082900A (en) * | 2020-09-16 | 2020-12-15 | 西南石油大学 | Testing device and method for improving gas injection quantity precision of long core of low-permeability oil and gas reservoir |
| CN113945498A (en) * | 2020-07-15 | 2022-01-18 | 中国石油化工股份有限公司 | Gas injection huff and puff physical simulation device and method based on huff and puff compensation system |
-
2007
- 2007-02-02 CN CN 200710013469 patent/CN101012747A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644459B (en) * | 2012-04-05 | 2014-07-16 | 西南石油大学 | Device and method for determining molecular diffusion coefficient of multi-component gas-liquid system in rock core |
| CN102644459A (en) * | 2012-04-05 | 2012-08-22 | 西南石油大学 | Device and method for determining molecular diffusion coefficient of multi-component gas-liquid system in rock core |
| CN102809975A (en) * | 2012-07-06 | 2012-12-05 | 中国石油天然气股份有限公司 | Automatic tracking control device and method for gas-liquid ratio of high-pressure foam profile control object model experiment |
| CN102865899B (en) * | 2012-09-07 | 2016-07-13 | 中国石油天然气集团公司 | High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method and device thereof |
| CN102865899A (en) * | 2012-09-07 | 2013-01-09 | 中国石油天然气集团公司 | In-situ fluid volume measuring method for use in high-temperature and high-pressure rock core displacement process and device thereof |
| CN103015993A (en) * | 2012-11-30 | 2013-04-03 | 中国石油天然气股份有限公司 | Water-gas dispersion injection device for core gas injection displacement experiment |
| CN103015993B (en) * | 2012-11-30 | 2015-07-08 | 中国石油天然气股份有限公司 | Water-gas dispersion injection device for core gas injection displacement experiment |
| CN103899303A (en) * | 2012-12-25 | 2014-07-02 | 中国石油天然气股份有限公司 | Medium mixed injection device and medium mixed injection process |
| CN104405377A (en) * | 2014-12-02 | 2015-03-11 | 东北石油大学 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
| CN104405377B (en) * | 2014-12-02 | 2017-05-10 | 东北石油大学 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
| CN104912525A (en) * | 2015-05-11 | 2015-09-16 | 中国石油大学(北京) | Oil-displacement experimental device used for low-permeability sandstone oil reservoir and oil-displacement experimental method used for low-permeability sandstone oil reservoir |
| CN104912525B (en) * | 2015-05-11 | 2017-11-14 | 中国石油大学(北京) | Oil displacement experiment device and method for low permeability sandstone reservoir |
| CN104948134A (en) * | 2015-06-30 | 2015-09-30 | 安东柏林石油科技（北京）有限公司 | Storage-type precise quantitative oil-gas well down-hole work agent injection system and injection method |
| CN105841775A (en) * | 2016-05-16 | 2016-08-10 | 中国石油天然气股份有限公司 | Water-producing gas well accumulated liquid pre-judgment experimental device and method |
| CN105841775B (en) * | 2016-05-16 | 2019-09-03 | 中国石油天然气股份有限公司 | Water-producing gas well accumulated liquid pre-judgment experimental device and method |
| CN109142128A (en) * | 2018-07-26 | 2019-01-04 | 中国石油天然气股份有限公司 | Dynamic scaling simulation experiment method and device for underground production equipment of ASP flooding oil well |
| CN109142128B (en) * | 2018-07-26 | 2021-04-27 | 中国石油天然气股份有限公司 | Dynamic scaling simulation experiment method and device for underground production equipment of ASP flooding oil well |
| CN109632557A (en) * | 2019-01-22 | 2019-04-16 | 中国矿业大学 | A kind of gas-liquid two-phase saturation coal petrography sample experimental provision and saturation degree test method |
| CN109632557B (en) * | 2019-01-22 | 2021-11-16 | 中国矿业大学 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method |
| CN113945498A (en) * | 2020-07-15 | 2022-01-18 | 中国石油化工股份有限公司 | Gas injection huff and puff physical simulation device and method based on huff and puff compensation system |
| CN112082900A (en) * | 2020-09-16 | 2020-12-15 | 西南石油大学 | Testing device and method for improving gas injection quantity precision of long core of low-permeability oil and gas reservoir |
| CN112082900B (en) * | 2020-09-16 | 2023-05-05 | 西南石油大学 | Testing device and method for improving gas injection accuracy of long core of low-permeability reservoir |
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