CN103278430A - Low-permeability rock core start-up pressure gradient testing device - Google Patents
Low-permeability rock core start-up pressure gradient testing device Download PDFInfo
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- CN103278430A CN103278430A CN2013101952712A CN201310195271A CN103278430A CN 103278430 A CN103278430 A CN 103278430A CN 2013101952712 A CN2013101952712 A CN 2013101952712A CN 201310195271 A CN201310195271 A CN 201310195271A CN 103278430 A CN103278430 A CN 103278430A
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Abstract
The invention relates to a low-permeability rock core start-up pressure gradient testing device, belonging to the technical field of a hydrocarbon reservoir evaluation method in oil-gas exploration and development processes. The low-permeability rock core start-up pressure gradient testing device is characterized in that a movable steel rod (4) is sheathed at the upper end of a bracket (7); a horizontal steel rod (1) is arranged on the top of the movable steel rod (4); a rotary table (13) is arranged on the bracket (7); one end of a steel wire pull rope (8) is arranged on the rotary table (13), and the other end of the steel wire pull rope (8) is arranged on the horizontal steel rod (1) by three fixed pulleys (2) and a movable pulley (9); a liquid storage tank (10) is arranged in a liquid carrier table (11); the bottom end of the liquid storage tank (10) is connected with a rubber tube (12) which is communicated with the bottom end of an intermediate container (14); the top of the intermediate container (14) is provided with an opening and is connected with a pipeline (19); the other end of the pipeline (19) is connected with one end of a rock core clamp holder (16). The low-permeability rock core start-up pressure gradient testing device can provide continuous injection pressure by continuously increasing the height of the liquid level of the liquid storage tank, so that the low-permeability rock core start-up pressure gradient can be measured. The low-permeability rock core start-up pressure gradient testing device has the characteristics of being simple and reasonable in structure, convenient to use, high in measurement accuracy, economical and practical.
Description
Technical field:
The present invention relates to a kind of low permeability cores starting pressure gradient proving installation, belong to oil and gas zone evaluation method and technology field in the oil-gas exploration and development process.
Background technology:
In the development of low-permeability oil reservoir process, the starting pressure gradient can produce very big influence to the reservoir development effect.Therefore, the research to hypotonic rock starting pressure gradient has very important meaning.
The research of starting pressure gradient is a very fine and hard work, does not also have perfect research method at present.Improve in shortage under the situation of research method, identical hypotonic rock sample tends to obtain different starting pressure gradients, the reliability of experimental data can not get guaranteeing, and the knotty problem of a large amount of LOW PERMEABILITY RESERVOIR is still unresolved,, pressure decline low as per-well production is fast etc., and this is just unfavorable greatly to the exploitation generation of China's LOW PERMEABILITY RESERVOIR.At present, many scholars study the starting pressure gradient of hypotonic rock on the basis of experiment.Now use comparatively generally " pressure reduction-flow " method and capillary equilibrium method, its pumping source that uses is N
2Bottle, constant-flux pump or high precision pump.
But the test of starting pressure gradient needs minimum flow conditions, and the flow velocity of above-mentioned pumping source is all excessive, is not desirable pumping source, uses its measurement of carrying out the starting pressure gradient will inevitably reduce the accuracy of experiment.In addition, experiment pressure reduction is mainly measured by tensimeter, and present manometric minimum scale is 500Pa, and pressure reduction is big at interval, can't realize that pressure reduction is continuous, can not obtain abundant representative data, and pressure reduction requires stabilization time very long, expends time in very much and energy, and data precision can't be guaranteed, cause than mistake, can not satisfy actual requirement.
Summary of the invention:
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of low permeability cores starting pressure gradient proving installation, by improving constantly the liquid level of fluid reservoir, continuous injection pressure is provided, accurately measure the Starting pressure of low permeability cores gradient, have the characteristics simple and reasonable, easy to use, that measuring accuracy is high, economical and practical.
The present invention realizes above-mentioned purpose by following technical solution.
In a kind of structure of low permeability cores starting pressure gradient proving installation, be provided with horizontal steel pole, fixed pulley, rule, movable steel pole, tighten up screw, tighten screw, support, steel wire tow line, travelling block, fluid reservoir, carrier fluid platform, rubber tube, rotating disk, intermediate receptacle, base, core holding unit, confined pressure pump, low permeability cores, pipeline, graduated cylinder; Support is installed on the base, is set with movable steel pole in the upper end of support; Movable steel pole can slide up and down in support, and is fixed by tightening up screw; On the top of movable steel pole horizontal steel pole is installed, at the other parallel rule that is equipped with of support; At support rotating disk is installed, rotating disk can rotate, and by the chucking screw it is tightened; One end of steel wire tow line is installed on the rotating disk, and the other end is installed on the horizontal steel pole through three fixed pulleys and a travelling block; The carrier fluid platform hangs the below that is installed in travelling block, and fluid reservoir places the carrier fluid platform, is connected with rubber tube in the bottom of fluid reservoir; The lower end of rubber tube is connected with the bottom of intermediate receptacle; The top of intermediate receptacle is provided with opening, is connected with pipeline, and the other end of pipeline is connected with an end of core holding unit; The outlet of the pipeline of the core holding unit other end is positioned at the top of graduated cylinder; Low permeability cores is equipped with in inside at core holding unit, and side joint has the confined pressure pump outside.
The present invention compared with prior art, by improving constantly the liquid level of fluid reservoir, continuous injection pressure is provided, just can measure the Starting pressure of low permeability cores gradient, liquid level can be accurate to 1mm, the measurement of starting pressure can be accurate to 10Pa, has improved 50 times than conventional method precision, has the characteristics simple and reasonable, easy to use, that measuring accuracy is high, economical and practical.
Description of drawings:
Fig. 1 is general structure synoptic diagram of the present invention.
In the drawings: 1. horizontal steel pole, 2. fixed pulley, 3. rule, 4. movable steel pole, 5. tighten up screw, 6. chucking screw, 7. support, 8. steel wire tow line, 9. travelling block, 10. fluid reservoir, 11. carrier fluid platforms, 12. rubber tubes, 13. rotating disks, 14. intermediate receptacles, 15. bases, 16. core holding units, 17. confined pressure pumps, 18. low permeability cores, 19. pipelines, 20. graduated cylinders.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples.
A kind of low permeability cores starting pressure of the present invention gradient proving installation by horizontal steel pole 1, fixed pulley 2, rule 3, movable steel pole 4, tighten up screw 5, chucking screw 6, support 7, steel wire tow line 8, travelling block 9, fluid reservoir 10, carrier fluid platform 11, rubber tube 12, rotating disk 13, intermediate receptacle 14, base 15, core holding unit 16, confined pressure pump 17, low permeability cores 18, pipeline 19, graduated cylinder 20 and form; Support 7 is installed on the base 15, is set with movable steel pole 4 in the upper end of support 7; Movable steel pole 4 can slide up and down in support 7, and is fixed by tightening up screw 5; Horizontal steel pole 1 is installed, at the support 7 other parallel rules 3 that are equipped with on the top of movable steel pole 4; At support 7 rotating disk 13 is installed, rotating disk 13 can rotate, and by tightening screw 6 with its chucking; One end of steel wire tow line 8 is installed on the rotating disk 13, and the other end is installed on the horizontal steel pole 1 through three fixed pulleys 2 and a travelling block 9; Carrier fluid platform 11 hangs the below that is installed in travelling block 9, and fluid reservoir 10 places carrier fluid platform 11, is connected with rubber tube 12 in the bottom of fluid reservoir 10; The lower end of rubber tube 12 is connected with the bottom of intermediate receptacle 14; The top of intermediate receptacle 14 is provided with opening, is connected with pipeline 19, and the other end of pipeline 19 is connected with an end of core holding unit 16; The outlet of the pipeline 19 of core holding unit 16 other ends is positioned at the top of graduated cylinder 20; In the inside of core holding unit 16 low permeability cores 18 is housed, side joint has confined pressure pump 17 outside.
Adopt the present invention to measure the Starting pressure of low permeability cores gradient, can carry out as follows:
(1), low permeability cores 18 cleaned after, be put in oven dry (12h) in the constant temperature oven (60 ° of C), weigh then, and measure its length L and perm-plug method.
(2), low permeability cores 18 samples after will handling place in the high pressure vessel, start vacuum pump and vacuumize (12h), make its saturation experiments salt solution.
(3), low permeability cores 18 samples of saturation experiments salt solution are packed in the core holding unit 16, apply confined pressure with confined pressure pump 17 simulating oil deposit conditions; Injection experiments salt solution in fluid reservoir 10, rubber tube 12 and intermediate receptacle 14.
(4), before measurement, regulate the height of fluid reservoir 10, make the liquid level of fluid reservoir 10 consistent with the height of core holding unit 16 ends, the pressure reduction that makes low permeability cores 18 two ends is 0, and writes down the liquid level value h of fluid reservoir 10 at this moment
1
(5), when measuring, promote the height of fluid reservoir 10 by rotating disk 13 gradually with the interval of 1mm, a period of time is stablized at the interval of every rising 1mm, and the liquid level of fluid reservoir 10 is risen gradually.When promoting fluid reservoir 10, observe the liquid level situation in the core holding unit 16 endpiece pipelines 19; Before fluid column pressure reached starting pressure, the liquid level in the core holding unit 16 endpiece pipelines 19 can not flow; After reaching starting pressure, the liquid level in the core holding unit 16 endpiece pipelines 19 begins to flow; Liquid level in core holding unit 16 endpiece pipelines 19 has just begun moment of flowing, and writes down the liquid level value h of fluid reservoir 10 this moment
2
(6), after measurement is finished, experimental record data calculate the starting pressure gradient of low permeability cores 18, computing formula (1) is:
Wherein: GradP: be starting pressure gradient, MPa/m;
ρ: be experiment brine density, g/cm
3
G: be acceleration of gravity, m/s
2
h
1:: be the liquid level value of initial fluid reservoir, mm;
h
2: be the flow liquid level value of fluid reservoir of moment of liquid level, mm;
L: be rock core length, cm.
Claims (3)
1. low permeability cores starting pressure gradient proving installation is by horizontal steel pole (1), fixed pulley (2), rule (3), movable steel pole (4), tighten up screw (5), chucking screw (6), support (7), steel wire tow line (8), travelling block (9), base (15), pipeline (19), graduated cylinder (20) and form; It is characterized in that in its structure, being provided with fluid reservoir (10), carrier fluid platform (11), rubber tube (12), rotating disk (13), intermediate receptacle (14), core holding unit (16), confined pressure pump (17), low permeability cores (18); Support (7) is installed on the base (15), is set with movable steel pole (4) in the upper end of support (7); On the top of movable steel pole (4) horizontal steel pole (1) is installed, at the other parallel rule (3) that is equipped with of support (7); At support (7) rotating disk (13) is installed, rotating disk (13) can rotate, and by tightening screw (6) with its chucking; One end of steel wire tow line (8) is installed on the rotating disk (13), and the other end is installed on the horizontal steel pole (1) through three fixed pulleys (2) and a travelling block (9); Carrier fluid platform (11) hangs the below that is installed in travelling block (9), and fluid reservoir (10) places carrier fluid platform (11), is connected with rubber tube (12) in the bottom of fluid reservoir (10); The lower end of rubber tube (12) is connected with the bottom of intermediate receptacle (14); The top of intermediate receptacle (14) is provided with opening, is connected with pipeline (19), and the other end of pipeline (19) is connected with an end of core holding unit (16); The outlet of the pipeline (19) of core holding unit (16) other end is positioned at the top of graduated cylinder (20); In the inside of core holding unit (16) low permeability cores (18) is housed.
2. a kind of low permeability cores starting pressure gradient proving installation according to claim 1 is characterized in that movable steel pole (4) can slide up and down, and is fixed by tightening up screw (5) in support (7).
3. a kind of low permeability cores starting pressure gradient proving installation according to claim 2 is characterized in that being connected to confined pressure pump (17) in the outside of core holding unit (16).
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| CN2013101952712A CN103278430A (en) | 2013-05-23 | 2013-05-23 | Low-permeability rock core start-up pressure gradient testing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297126A (en) * | 2014-10-17 | 2015-01-21 | 中国石油天然气股份有限公司 | Gas seepage starting pressure gradient measuring device and method for low-permeability reservoir |
| CN106124381A (en) * | 2016-06-21 | 2016-11-16 | 河南理工大学 | Hypotonic coal seam reservoirs gas free-boundary problem and the on-the-spot test method of permeability |
| CN106324212A (en) * | 2015-06-19 | 2017-01-11 | 中国石油化工股份有限公司 | Quick testing device and method of rock core gas start pressure |
| CN106918541A (en) * | 2017-03-20 | 2017-07-04 | 中海石油(中国)有限公司 | Fluid starts in a kind of observation seepage environment measurement apparatus and method |
| US10801943B2 (en) | 2017-06-26 | 2020-10-13 | China University Of Petroleum-Beijing | Apparatus and method for measuring apparent permeability of tight rock core |
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| JPH041555A (en) * | 1990-04-17 | 1992-01-07 | Hosokawa Micron Corp | Measuring instrument for liquid penetration speed to power and granular material |
| CN101852714A (en) * | 2010-04-30 | 2010-10-06 | 中国石油大学(北京) | Measuring system and method of low-speed non-linear seepage parameters |
| CN101968423A (en) * | 2009-07-27 | 2011-02-09 | 中国石油天然气股份有限公司 | Low-permeability reservoir starting pressure testing method |
-
2013
- 2013-05-23 CN CN2013101952712A patent/CN103278430A/en active Pending
Patent Citations (3)
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| JPH041555A (en) * | 1990-04-17 | 1992-01-07 | Hosokawa Micron Corp | Measuring instrument for liquid penetration speed to power and granular material |
| CN101968423A (en) * | 2009-07-27 | 2011-02-09 | 中国石油天然气股份有限公司 | Low-permeability reservoir starting pressure testing method |
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Non-Patent Citations (2)
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| 陈志明 等: "低渗透岩石渗流规律的实验研究方法综述", 《新疆石油科技》, vol. 22, no. 2, 31 December 2012 (2012-12-31), pages 29 - 31 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297126A (en) * | 2014-10-17 | 2015-01-21 | 中国石油天然气股份有限公司 | Gas seepage starting pressure gradient measuring device and method for low-permeability reservoir |
| CN104297126B (en) * | 2014-10-17 | 2016-08-31 | 中国石油天然气股份有限公司 | Gas seepage starting pressure gradient measuring device and method for low-permeability reservoir |
| CN106324212A (en) * | 2015-06-19 | 2017-01-11 | 中国石油化工股份有限公司 | Quick testing device and method of rock core gas start pressure |
| CN106124381A (en) * | 2016-06-21 | 2016-11-16 | 河南理工大学 | Hypotonic coal seam reservoirs gas free-boundary problem and the on-the-spot test method of permeability |
| CN106918541A (en) * | 2017-03-20 | 2017-07-04 | 中海石油(中国)有限公司 | Fluid starts in a kind of observation seepage environment measurement apparatus and method |
| US10801943B2 (en) | 2017-06-26 | 2020-10-13 | China University Of Petroleum-Beijing | Apparatus and method for measuring apparent permeability of tight rock core |
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