CN102865899B - High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method and device thereof - Google Patents
High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method and device thereof Download PDFInfo
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- CN102865899B CN102865899B CN201210331360.0A CN201210331360A CN102865899B CN 102865899 B CN102865899 B CN 102865899B CN 201210331360 A CN201210331360 A CN 201210331360A CN 102865899 B CN102865899 B CN 102865899B
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Abstract
The invention discloses a kind of method that can carry out fluid volume in site measurement in High Temperature High Pressure rock core displacement process, and the method can be used to carry out the device of fluid volume measurement.The method is divided into three steps, and the first step is the preparation before formal displacement, it is therefore an objective to make fluid and fluid in container in fluid in rock core, conduit be under corresponding high temperature and high pressure environment；Second step starts formal displacement, squeezes into displacement liquid by compression pump, and the fluid (especially gas and oil) that displacement goes out from rock core comes together in an airtight transparent vessel；3rd step is for measuring each fluid volume, after oil gas water is fully layered, owing to the color of three kinds of fluids is different, can be read the volume of three by the scale on container.Designed fluid volume measurement apparatus simple in construction, only need to increase by four valves, two conduits, two pressure-measuring devices, a collection container, a buffer container and a semi-permeable plate on the basis of conventional high temperature high pressure rock core displacement test device.
Description
Technical field
Present invention simultaneously relates to a kind of fluid volume measurement apparatus, particularly relate to a kind of High Temperature High Pressure rock core displacement process medium fluid volume measurement device.
Background technology
Under High Temperature High Pressure, the especially existence of high temperature so that displace fluid in rock core displacement process and there is gas-liquid two-phase.Displacing the uncovered little graduated cylinder of the many employings of fluid at present directly to measure, catching and measuring of such gas phase just cannot realize；Additionally at high temperature, liquid is volatile, and therefore the error in dipping of liquid is relatively big, and particularly in tight sand displacement test, owing to displacement velocity is slow, it is only small to displace amount of liquid, and the error that the volatilization of liquid causes can be bigger.For the shortcoming adopting uncovered little graduated cylinder metering method to exist, it is proposed that closed metering system, in thin glass tube, namely fill one section of thick liquid (such as aerial kerosene) block.Though this mode can be caught and meter gaseous, the volatilization of liquid can also be avoided, but still there is a lot of problem in this metering method, more topmost is that this metering method cannot realize fluid and is in environment under high pressure, the change of pressure is very big on gas volume impact, also affect gas dissolubility in a liquid simultaneously, and then change gas-liquid volume ratio, each phase fluid volume of measuring down by this way still inaccurate, it is impossible to truly reflect the fluid volume within rock core under High Temperature High Pressure.
Summary of the invention
It is an object of the invention to provide a kind of method that can carry out fluid volume in site measurement in High Temperature High Pressure rock core displacement process, and the method can be used to carry out the device of fluid volume measurement.
nullIt is an object of the invention to be achieved through the following technical solutions: before formal displacement, do following preparation，Set the temperature of calorstat as testing required high-temperature temperature，After temperature is increased to setting value and keeps certain time，Liquid is injected respectively from core holding unit two ends toward each conduit and container，Wherein can pass through to open the valve collecting container upper end and discharge the air besieged，And then ensure to collect in container without air，Then ring pressure and axial compression is applied to core holding unit，What regulate back-pressure valve opens the pressure pressure more than rear liquid to be pressurised，Then respectively from core holding unit two ends liquid synchronzed press to predetermined pressure，But the pressure of liquid is less than ring pressure and the axial compression of applying after pressurization，So that fluid in rock core、In conduit, fluid and fluid in container are under corresponding high temperature and high pressure environment，Come together in hermetic container to ensure that gas that displacement goes out is as far as possible many，Add semi-permeable plate in the catheter to stop gas to pass through；After above preparation completes, start formal displacement, first the pressure of opening turning down back-pressure valve is the pressure of fluid in rock core after pressurization, then passing through compression pump is displacement liquid pressing, can open towards core holding unit valve when the pressure that the pressure of displacement liquid is increased in rock core fluid, continuing through compression pump is displacement liquid pressing, displacement liquid is made to enter rock core, the fluid (especially gas and oil) that displacement goes out from rock core is before flowing out back-pressure valve, under gravity, come together in an airtight transparent vessel；Before measuring each fluid volume, it is preferably interrupted displacement static regular hour, it is ensured that oil gas water is fully layered in hermetic container, after oil and gas and water layer, in addition the color of three kinds of fluids is different, the volume of three can be read, due to the complexity of rock core pore structure, in whole displacement process by the scale on container, there is fluctuation in the pressure of fluid, for the fluctuation of slowing down fluid pressure, add a buffer container, filling air in container.
The inventive method specifically includes following steps:
Step 1: before formal displacement, in high temperature environments, liquid is filled in advance in each conduit and collection container, after core holding unit applies ring pressure and axial compression, again respectively from core holding unit two ends liquid synchronzed press so that in rock core, in fluid, conduit, fluid and fluid in container are under corresponding high temperature and high pressure environment；
Step 2: start formal displacement, the fluid (especially gas and oil) that displacement goes out from rock core, before flowing out back-pressure valve, is collected by a hermetic container；
Step 3: interrupting displacement, after static certain time, oil gas water density difference makes three be layered in hermetic container, by the volume of the cup scale metered three on container.
The present invention is before the liquid synchronzed press of core holding unit two ends, the pressure of opening of back-pressure valve is greater than the pressure of liquid after pressurization, after pressurization, the pressure of liquid is less than ring pressure and the axial compression of applying, and when starting formal displacement, the pressure of opening turning down back-pressure valve is the pressure of fluid in rock core after pressurization.
The present invention squeezes into the pressure of displacement liquid by compression pump can open valve equal in rock core during the pressure of fluid, when improving displacement fluid pressure further so that displacement liquid enters rock core.
The present invention uses semi-permeable plate to stop gas to pass through, thus ensureing that gas collection that displacement goes out is in hermetic container.
In order to slow down the fluctuation of fluid pressure in displacement process, add a buffer container, filling air in container.
The device that High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method of the present invention uses is to add four valves (2,8,10,14) on the basis of conventional high temperature high pressure rock core displacement test device, two conduits (7,13), two pressure-measuring devices (6,15), one collection container (9), a buffer container (12) and a semi-permeable plate (4).
The entrance that the present invention collects container (9) is broad, and main body is very thin, and top is provided with gas vent (11), makes material high temperature high voltage resistant, is unlikely to deform and transparent, and peripheral with strengthening steel slab, inwall scribbles hates oil reservoir.
Buffer container of the present invention (12) volume is big, makes material high temperature high voltage resistant and is unlikely to deform.
Compared with prior art, the invention has the beneficial effects as follows, the fluid that in High Temperature High Pressure and rock core displacement process, displacement can be gone out carries out in site measurement, fluid volume certainty of measurement is high, and the volume of the internal each phase fluid of rock core under High Temperature High Pressure can be reflected more truly, additionally designed apparatus structure is simple, only need to increase several accessory on the basis of conventional high temperature high pressure rock core displacement test device.
Accompanying drawing explanation
Fig. 1 is the structural representation of High Temperature High Pressure rock core displacement process medium fluid volume in-situ measurement device of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
Experimental provision in accompanying drawing, except compression pump 1, other device is all positioned in calorstat.nullBefore formal displacement，First the temperature of calorstat is set as testing required high-temperature temperature，Close valve 2，What regulate back-pressure valve 5 opens the pressure pressure more than rear liquid to be pressurised，After temperature is increased to setting value and keeps certain time，Open valve 8 and 14，Liquid is injected from core holding unit 3 two ends toward each conduit and container respectively through conduit 7 and 13，Period discharges, by opening the valve 10 collecting container 9 upper end, the air besieged wherein，Guarantee to collect in container 9 without air，Turn off valve 10 afterwards，Apply ring pressure and axial compression then to core holding unit 3，Then respectively through conduit 7 and 13 liquid synchronzed press，After fluid pressure is increased to predetermined pressure，Close valve 8 and 14，The pressure of liquid can pass through two pressure-measuring device 6 and 15 real-time monitored，Come together in hermetic container 9 to ensure that gas that displacement goes out is as far as possible many，Add semi-permeable plate 4 in the catheter to stop gas to pass through；During formal displacement, first the pressure of opening turning down back-pressure valve 5 is the pressure of fluid in rock core after pressurization, then pass through compression pump 1 for displacement liquid pressing, open towards core holding unit valve 2 when the pressure that the pressure of displacement liquid is increased in rock core fluid, continue through compression pump 1 for displacement liquid pressing, the fluid (especially gas and oil) that displacement goes out from rock core is before flowing out back-pressure valve 5, under gravity, comes together in collection container 9；Collect container 9 transparent and on have scale, static certain time to make oil and gas and water layer after, read the volume of three by collecting the scale on container 9.
Claims (2)
1. High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method, it is characterised in that comprise the steps:
nullStep 1: before formal displacement，First the temperature of calorstat is set as testing required high-temperature temperature，After temperature is increased to setting value and keeps certain time，Then pass through conduit (7)、(13) toward each conduit and collection container (9), displacing fluid is filled from core holding unit (3) two ends，Apply ring pressure and axial compression then to core holding unit (3)，What regulate back-pressure valve (5) opens the pressure pressure more than rear liquid to be pressurised，Then respectively through conduit (7)、(13) from core holding unit (3) two ends liquid synchronzed press to predetermined pressure，The pressure of liquid can pass through two pressure-measuring devices (6) and (15) real-time monitored，But the pressure of liquid is less than ring pressure and the axial compression of applying after pressurization，So that fluid in rock core、Fluid in conduit and collect fluid in container (9) and be under corresponding high temperature and high pressure environment，Come together in airtight collection container (9) to ensure that gas that displacement goes out is as far as possible many，Add semi-permeable plate (4) in the catheter to stop gas to pass through；
Step 2: during formal displacement, first the pressure of opening turning down back-pressure valve (5) is the pressure of fluid in rock core after pressurization, then pass through compression pump (1) to pressurize for displacing fluid, when the pressure that the pressure of displacing fluid is increased in rock core fluid, open the valve (2) towards core holding unit (3), continue through compression pump (1) to pressurize for displacing fluid, displacing fluid is made to enter rock core, the fluid that displacement goes out from rock core is before flowing out back-pressure valve (5), under gravity, come together in collection container (9)；
Step 3: interrupt displacement, and after static certain time, oil gas water density difference makes three fully be layered in airtight collection container (9), after oil and gas and water layer, can by collecting the volume of the cup scale metered three on container (9).
2. the High Temperature High Pressure rock core displacement process medium fluid volume in-situ measuring method according to claim l, it is characterized in that, collect the entrance width of container (9), main body is thin, top is provided with gas vent (11), makes material high temperature high voltage resistant, is unlikely to deform and transparent, peripheral with strengthening steel slab, inwall scribbles hates oil reservoir.
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| CN103383378B (en) * | 2013-07-19 | 2014-11-05 | 东北石油大学 | Oil gas adsorption-desorption displacement experiment device |
| CN106323402A (en) * | 2015-06-29 | 2017-01-11 | 中国石油天然气股份有限公司 | Flow measurement method and flow measurement device of rock core displacement experiment |
| CN105673003B (en) * | 2015-12-29 | 2019-05-07 | 中国石油天然气股份有限公司 | A kind of fine and close oil exploitation physical simulation experiment method |
| CN106989792B (en) * | 2017-05-18 | 2019-11-08 | 太仓阳鸿石化有限公司 | The measurement method of liquid chemical product and gas volume in ship-to-shore feed-line |
| CN111663938B (en) * | 2019-03-05 | 2023-07-04 | 中国石油化工股份有限公司 | High-temperature drilling temperature measurement method |
| CN114509374A (en) * | 2020-11-17 | 2022-05-17 | 中国石油天然气股份有限公司 | Gas-liquid metering device and method |
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