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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- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011435 rock Substances 0.000 title claims description 12
- 238000012360 testing method Methods 0.000 title description 7
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 238000002474 experimental method Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 abstract description 17
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract 1
- 239000006260 foam Substances 0.000 description 5
- 238000001802 infusion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明提供了一种用于石油岩心驱替实验中气液比控制的方法。具体是在岩心出口处加装回压阀，控制出口压力，岩心入口处通过中间容器用计量泵注入顶替液控制注入速度，在此基础上，分别在储液容器和储气容器上各安装一个压力传感，实时监测液体压力和气体压力的变化，同时在储气容器上连接气体增压泵和补充气源，当液体压力与气体压力之差大于设定值时，则自动启动气体增压泵给气体增压，使气体压力与液体压力保持一致，保证气体能够注入，从而使气体的实际排量与设定排量一致，精确控制气液注入比例。
The invention provides a method for controlling the gas-liquid ratio in the petroleum core displacement experiment. Specifically, a back pressure valve is installed at the outlet of the core to control the outlet pressure, and the displacement fluid is injected into the inlet of the core through an intermediate container with a metering pump to control the injection speed. On this basis, one is installed on the liquid storage container and the gas storage container respectively Pressure sensing, real-time monitoring of changes in liquid pressure and gas pressure, while connecting a gas booster pump and a supplementary gas source to the gas storage container, when the difference between the liquid pressure and gas pressure is greater than the set value, the gas booster is automatically activated The pump pressurizes the gas to keep the gas pressure consistent with the liquid pressure to ensure that the gas can be injected, so that the actual displacement of the gas is consistent with the set displacement, and the gas-liquid injection ratio is precisely controlled.
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.
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| Application Number | Priority Date | Filing Date | Title |
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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 |
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2007
- 2007-02-02 CN CN 200710013469 patent/CN101012747A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 | Method and device for in-situ measurement of fluid volume during high temperature and high pressure core displacement |
| 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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