CN203658217U - Seepage starting pressure gradient test device - Google Patents

Seepage starting pressure gradient test device Download PDF

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Publication number
CN203658217U
CN203658217U CN201420005418.7U CN201420005418U CN203658217U CN 203658217 U CN203658217 U CN 203658217U CN 201420005418 U CN201420005418 U CN 201420005418U CN 203658217 U CN203658217 U CN 203658217U
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CN
China
Prior art keywords
flow
pressure
pressure gradient
seepage
test
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CN201420005418.7U
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Chinese (zh)
Inventor
吕栋梁
李宏远
唐海
魏铭江
王新杰
韦颖
舒杰
周强
郭丰
唐佳
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西南石油大学
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Priority to CN201420005418.7U priority Critical patent/CN203658217U/en
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Publication of CN203658217U publication Critical patent/CN203658217U/en

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Abstract

The utility model relates to a seepage starting pressure gradient test device which comprises a core holding unit, a confining pressure device, a height-variable constant-liquid tank, a precision electronic balance, a capillary tube with scales, a six-way tube, a tapered beaker, a precision pressure gauge and a constant-flow pump. Through the theory of parallel connection, the seepage starting pressure gradient tests of a plurality of cores can be carried out at the same time. The data points at the low-dropout flow seepage stages are correctly collected by utilizing the height-variable constant-liquid tank; the data points at the relatively high-dropout flow seepage stages are correctly collected by utilizing the constant-flow pump; and the starting point of a dropout flow relation curve is correctly collected by utilizing the capillary tube with scales. By drawing two sleeves and point data in a same data table, an integral dropout and a flow relation curve are obtained so as to solve core seepage starting pressure gradients in different forms. The seepage starting pressure gradient test device can be used for testing the core seepage starting pressure gradients.

Description

A kind of pressure gradient experimental apparatus for testing

Technical field

The utility model relates to a kind of pressure gradient experimental apparatus for testing, specifically be a kind of experimental provision of testing low permeability reservoir rock core pressure gradient and differential pressure flow relation curve.

Background technology

Along with the development of China Petroleum, will there is more low permeability oil field to drop into exploitation.A large amount of simulating lab test and field tests show, the low speed seepage flow of fluid in low-permeability oil deposit no longer meets Darcy's law, but has the feature of pressure gradient.How accurately complete differential pressure flow relation curve and the pressure gradient of testing out of method is by experiment the key of research Non-Darcy Flow in Low Permeability Reservoir rule.

Measure at present starting pressure gradient and mainly adopt stable state " pressure reduction-discharge method ", " capillary equilibrium method " or assay method that both combine.Pressure reduction-discharge method, adopts conventional constant flow pump can only measure larger differential pressure flow relation data point, and what obtain is to intend pressure gradient; Capillary equilibrium method can only record the starting point of differential pressure flow relation curve, and what obtain is true pressure gradient.Therefore in the low voltage difference flow seepage flow stage, under prior art means condition, unless adopted superhigh precision constant flow pump, most of data point cannot accurately collect, but superhigh precision constant flow pump is expensive.In the situation that lacking data point, be difficult to the description fluid seepage flow characteristics with the method complete and accurate of mathematics.This experimental provision has overcome above-mentioned shortcoming, by the simple combination of cheap equipment, both can adopt cheap conventional constant flow pump to obtain larger differential pressure flow seepage flow number of stages strong point, also can adopt the permanent liquid case of variable height to record the low voltage difference flow data point in seepage flow stage, therefore can determine exactly whole flow event, obtain the relation curve equation of complete pressure reduction and flow, and then can be in the hope of the multi-form pressure gradient of rock core and seepage flow equation function expression.

Summary of the invention

The purpose of this utility model is as far as possible accurately intactly to determine the whole flow event of rock core, for Start-up Pressure Gradients in Low Permeability Reservoir test provides experiment basis.

The technical scheme that the utility model adopts is:

This pressure gradient experimental apparatus for testing comprises the permanent liquid case, precise electronic balance of core holding unit, confined pressure device, variable height, kapillary with scale, six logical, tapered beaker, precision pressure gauge, constant flow pump.By principle in parallel, can carry out the pressure gradient test of multiple rock cores simultaneously.Utilize the permanent liquid case of variable height accurately to gather low voltage difference flow seepage flow number of stages strong point, utilize constant flow pump accurately to gather larger differential pressure flow seepage flow number of stages strong point, the kapillary of utilization with scale accurately gathers the starting point of differential pressure flow relation curve.Two covers and some data are plotted in same tables of data, obtain complete pressure reduction and discharge relation curve and then try to achieve multi-form rock core pressure gradient

Advantage of the present utility model: the equipment price of employing is cheap and easy and simple to handle; Many cover determinators can be installed and carry out multiple tests simultaneously; Can accurately intactly determine whole flow event; Can test out multi-form starting pressure gradient; The variation of the precise electronic balance metering quality using, its measuring accuracy reaches 0.0001g, and measuring accuracy is high.

Accompanying drawing explanation

Fig. 1 is the utility model agent structure schematic diagram.

In figure: 1. the permanent liquid case of variable height, 2. constant flow pump, 3. confined pressure device, 4. precision pressure gauge, the 5. kapillary with scale, 6. core holding unit, 7. conical beaker, 8. six is logical, 9. precise electronic balance.

Embodiment

How just introduce in detail by reference to the accompanying drawings experiment below implements:

As shown in Figure 1, Fig. 1 is the utility model agent structure schematic diagram, and this experimental provision is by the permanent liquid case 1 of variable height, constant flow pump 2, confined pressure device 3, precision pressure gauge 4, kapillary 5 with scale, core holding unit 6, conical beaker 7, six logical 8 and precise electronic balance 9 and forming.

It is characterized in that experiment rock core is arranged on core holding unit 6, is connected the while to multiple core holding units 6 end pressure that provides access by constant flow pump 2 and six logical 8, inlet end pressure pressure is measured by precision pressure gauge 4, and core holding unit 6 endpiece connect tapered beaker 7.Weigh the increase of fluid mass in the tapered beaker 7 of certain experimental period by precise electronic balance 9, by the anti-dilatation of releasing of density of fluid, calculate volumetric flow rate by experimental period, by changing constant flow pump 2 flows, can carry out the experiment under different test pressure differential in larger differential pressure flow flow event.Permanent liquid case 1 by variable height and six logical 8 is connected the while to multiple core holding units 6 end pressure that provides access, and inlet end pressure is by being with scale kapillary 5 liquid levels to measure, and core holding unit 6 endpiece connect tapered beaker 7.Weigh the increase of fluid mass in the tapered beaker 7 of certain experimental period by precise electronic balance 9, by the anti-dilatation of releasing of density of fluid, calculate volumetric flow rate by experimental period, by the weigh height of liquid case 1 of change, can carry out the experiment under different test pressure differential in low voltage difference flow flow event.Add the kapillary 5 with scale at any outlet port of rock core holder, carry out the starting point of capillary equilibrium method test determination differential pressure flow relation curve, and then can complete the experiment of complete flow event and the multi-form pressure gradient test of rock core.

This pressure gradient experimental apparatus for testing, in the time testing, mainly comprises the steps:

(1) preliminary work: rock core vacuumizing, then saturated local water or formation oil.

(2) rock core of saturated water or oil is arranged in core holding unit, adds confined pressure and press from both sides real rock core.

(3) open six logical middle constant flow pump pipelines and carry out the step-by-step test of higher differential pressure flow seepage flow.

(4) open constant flow pump, test with certain flow.

(5) after endpiece stability of flow, be designated as starting point, timing, endpiece accesses tapered beaker, is weighed the added value of a period of time inner fluid quality, by the anti-volumetric flow rate that pushes away of fluid density by precise electronic balance.

(6) core entry end pressure is recorded by precision pressure gauge, and endpiece pressure is atmospheric pressure, and then calculates test pressure differential, note pressure reduction.

(7) change constant flow pump flow, repeat 3~6 steps, record higher differential pressure flow seepage flow number of stages strong point.

(8) closing constant flow pump pipeline opens the permanent liquid case pipeline of variable height and carries out the step-by-step test of low voltage difference flow seepage flow.

(9) open permanent liquid case, after level balance, open inlet end valve.

(10) after endpiece stability of flow, be designated as starting point, timing, endpiece accesses tapered beaker, is weighed the added value of a period of time inner fluid quality, by the anti-volumetric flow rate that pushes away of fluid density by precise electronic balance.

(11) core entry end pressure is obtained by kapillary liquid level high computational, and endpiece pressure is atmospheric pressure, and then calculates test pressure differential, note pressure reduction.

(12) change permanent liquid case height, repeat 9~11 steps, record low voltage difference flow seepage flow number of stages strong point.

(13) install the kapillary with scale additional at outlet port of rock core holder, carry out the starting point of capillary equilibrium method test determination differential pressure flow relation curve.

By by test pressure differential and corresponding flow calibration in plate, can accurately complete flow event must be described out, obtain multi-form pressure gradient and seepage flow equation function expression.

Claims (4)

1. a pressure gradient experimental apparatus for testing, comprises the permanent liquid case (1), precise electronic balance (9) of core holding unit (6), confined pressure device, variable height, the kapillary (5) with scale, six logical (8), tapered beakers (7), precision pressure gauge (4), constant flow pump (2); By principle in parallel, can carry out the pressure gradient test of multiple rock cores simultaneously; Utilize the permanent liquid case of variable height accurately to gather low voltage difference flow seepage flow number of stages strong point, utilize constant flow pump accurately to gather larger differential pressure flow seepage flow number of stages strong point, the kapillary of utilization with scale accurately gathers the starting point of differential pressure flow relation curve; Two covers and some data are plotted in same tables of data, obtain complete pressure reduction and discharge relation curve and then try to achieve multi-form rock core pressure gradient.
2. a kind of pressure gradient experimental apparatus for testing according to claim 1, the rock core of saturated oil (water) is arranged on core holding unit (6), is connected the while to multiple core holding units (6) end pressure that provides access by constant flow pump (2) and six logical (8), inlet end pressure pressure is measured by precision pressure gauge (4), core holding unit (6) endpiece connects tapered beaker (7), weigh the increase of fluid mass in the tapered beaker of certain experimental period (7) by precise electronic balance (9), by the anti-dilatation of releasing of density of fluid, calculate volumetric flow rate by experimental period, by changing constant flow pump (2) flow, can carry out the experiment under different test pressure differential in larger differential pressure flow flow event, permanent liquid case (1) by variable height and six logical (8) are connected the while to multiple core holding units (6) end pressure that provides access, inlet end pressure is by being with scale kapillary (5) liquid level to measure, core holding unit (6) endpiece connects tapered beaker (7), weigh the increase of fluid mass in the tapered beaker of certain experimental period (7) by precise electronic balance (9), by the anti-dilatation of releasing of density of fluid, calculate volumetric flow rate by experimental period, by the weigh height of liquid case (1) of change, can carry out the experiment under different test pressure differential in low voltage difference flow flow event, add the kapillary (5) with scale at any outlet port of rock core holder, carry out the starting point of capillary equilibrium method test determination differential pressure flow relation curve, and then can complete the experiment of complete flow event and the multi-form pressure gradient test of rock core.
3. a kind of pressure gradient experimental apparatus for testing according to claim 1, can measure rock core starting pressure gradient.
4. a kind of pressure gradient experimental apparatus for testing according to claim 1, is characterized in that: the equipment price of employing is cheap and easy and simple to handle; Many cover determinators can be installed and carry out multiple tests simultaneously; Can accurately intactly determine whole flow event; Can test out multi-form starting pressure gradient; The variation of the precise electronic balance metering quality using, its measuring accuracy reaches 0.0001g, and measuring accuracy is high.
CN201420005418.7U 2014-01-06 2014-01-06 Seepage starting pressure gradient test device CN203658217U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104215506A (en) * 2014-09-15 2014-12-17 中国矿业大学 Gradient confining pressure loading method
CN104297126A (en) * 2014-10-17 2015-01-21 中国石油天然气股份有限公司 Device and method applied to measurement of low-permeability reservoir gas seepage start-up pressure gradient
CN104359819A (en) * 2014-11-10 2015-02-18 中国石油天然气股份有限公司 Device and method for determining gas-water relative permeability of low-infiltration dense rock core
CN105319153A (en) * 2015-02-11 2016-02-10 中国石油化工股份有限公司 Measuring method of liquid full pressure gradient-flow relation in low-permeability reservoir
CN105758582A (en) * 2016-03-02 2016-07-13 中国石油大学(北京) Device and method for measuring flowing start pressure of fluid in porous medium
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
CN106802271A (en) * 2017-02-08 2017-06-06 中海石油(中国)有限公司 A kind of measurement apparatus and method of poly- oil reservoirs fluid neuron network free-boundary problem
CN109557010A (en) * 2018-11-07 2019-04-02 北京科技大学 A kind of experimental method measuring pressure gradient
CN109580448A (en) * 2017-09-29 2019-04-05 中国石油化工股份有限公司 Starting Pressure Gradient in Low Permeability Reservoir test device and method
CN110044790A (en) * 2019-04-10 2019-07-23 中国科学院地质与地球物理研究所 A kind of measuring device and method of critical filling pressure

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104215506A (en) * 2014-09-15 2014-12-17 中国矿业大学 Gradient confining pressure loading method
CN104215506B (en) * 2014-09-15 2016-06-22 中国矿业大学 A kind of gradient confined pressure loading method
CN104297126B (en) * 2014-10-17 2016-08-31 中国石油天然气股份有限公司 low permeability reservoir gas seepage starting pressure gradient measuring device and measuring method
CN104297126A (en) * 2014-10-17 2015-01-21 中国石油天然气股份有限公司 Device and method applied to measurement of low-permeability reservoir gas seepage start-up pressure gradient
CN104359819A (en) * 2014-11-10 2015-02-18 中国石油天然气股份有限公司 Device and method for determining gas-water relative permeability of low-infiltration dense rock core
CN105319153A (en) * 2015-02-11 2016-02-10 中国石油化工股份有限公司 Measuring method of liquid full pressure gradient-flow relation in low-permeability reservoir
CN105758582A (en) * 2016-03-02 2016-07-13 中国石油大学(北京) Device and method for measuring flowing start pressure of fluid in porous medium
CN105758582B (en) * 2016-03-02 2019-02-22 中国石油大学(北京) The measuring device and method of fluid flowing starting pressure in porous media
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
CN106802271A (en) * 2017-02-08 2017-06-06 中海石油(中国)有限公司 A kind of measurement apparatus and method of poly- oil reservoirs fluid neuron network free-boundary problem
CN109580448A (en) * 2017-09-29 2019-04-05 中国石油化工股份有限公司 Starting Pressure Gradient in Low Permeability Reservoir test device and method
CN109557010A (en) * 2018-11-07 2019-04-02 北京科技大学 A kind of experimental method measuring pressure gradient
CN110044790A (en) * 2019-04-10 2019-07-23 中国科学院地质与地球物理研究所 A kind of measuring device and method of critical filling pressure
CN110044790B (en) * 2019-04-10 2020-06-19 中国科学院地质与地球物理研究所 Device and method for measuring critical filling pressure

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Granted publication date: 20140618

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