CN103543091A - Device for testing permeability of rock core - Google Patents

Device for testing permeability of rock core Download PDF

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Publication number
CN103543091A
CN103543091A CN201310521785.2A CN201310521785A CN103543091A CN 103543091 A CN103543091 A CN 103543091A CN 201310521785 A CN201310521785 A CN 201310521785A CN 103543091 A CN103543091 A CN 103543091A
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China
Prior art keywords
outlet
switch
holding unit
differential pressure
core
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CN201310521785.2A
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Chinese (zh)
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CN103543091B (en
Inventor
熊钰
杨蕾
冯凯
刘斌
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西南石油大学
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Publication of CN103543091A publication Critical patent/CN103543091A/en
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Abstract

The invention discloses a device for testing the permeability of a rock core. The device for testing the permeability of the rock core comprises a rock core clamper, a differential pressure sensor, a first outlet, a second outlet, a first switch, a third switch, a second switch, a digital display meter, a rock core clamper outlet and a rock core clamper inlet. According to the differential pressure sensor provided by the invention, two ends of the differential pressure sensor can bear the end pressure of 20MPa, the reservoir depth of about 1,000-2,000m can be simulated, a pressure difference value between 0KPa and 100KPa is acquired, and the accuracy is 0.5 percent, namely the data drift amount can be controlled to be 100*0.5%=0.5KPa. The errors of the device for testing the permeability of the rock core are reduced, the accuracy of the device is improved, and the measurement range of the device is widened.

Description

A kind of device of testing rock core permeability
Technical field
The invention belongs to core permeability technical field of measurement and test, relate in particular to a kind of high device that oozes loose rock sample testing rock core permeability.
Background technology
Oilfield enterprise or company, in order to understand subsurface reservoir character, usually can carry out coring operation, then by rock core at the indoor core experiment that carries out, obtain geologic parameter, core experiment core sample used also has big or small regulation, and diameter is 2.54 centimetres, and length generally can not be shorter than diameter;
Qualified rock core is put into core holding unit, and connect pressure transducer at rock core import and export two ends, because test medium has inlet pressure when entering rock core, in process by rock core, have pressure loss, so import and export pressure at two ends sensor, can collect different numerical value, bring these numerical value into correlation formula and can calculate the physical parameters such as core permeability.
Existing technology: in current reservoir physics experiment, substantially all adopts pressure sensor gathers rock core pressure at two ends, because rock core is cementing, the difference of compactness extent, can produce different displacement pressure reduction, i.e. pressure drop, from several kPas (KPa) to tens MPas (MPa) not etc., 1MPa=1000KPa wherein, general atmosphere is pressed and is got 0.1MPa;
Permeability K shows that rock is by the ability of fluid media (medium), and computing formula is as follows;
K = μLQ ΔpA × 10 - 1
Wherein: the viscosity of μ-medium, mPas
The length of L-rock core, cm
Q-under Δ P pressure reduction, through the flow of rock core, cm 3/ s
Δ P-rock core well head outlet pressure at two ends is poor, MPa
A-core section is long-pending, cm 2
Conventionally pore media being allowed to the fluid (water is at normal pressure, and the viscosity in the time of 20 ℃ is got 1.005mPas) of viscosity 1mPas, under the effect that is 0.1MPa, is 1cm by cross-sectional area at pressure difference value 2, flow is 1cm 3during/s, the permeability of gained is defined as 1 darcy; Except crack and understressed sand, actual hydrocarbon zone permeability higher than 1 darcy seldom, is measured permeability size, 1000 millidarcy=1 darcies therefore commonly use millidarcy.
Existing core permeability proving installation self error is larger, and inevitably data drift amount, calculates result and depart from actual value; The very high loose rock sample of permeability particularly, because resistance to flow is little, data drift can produce very large error; The permeability range of existing apparatus range test is simultaneously little, cannot meet actual requirement.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of device of testing rock core permeability, is intended to solve existing core permeability proving installation self error larger, and inevitably data drift amount, calculates result and depart from actual value; Range is little, cannot meet the problem of actual requirement.
The embodiment of the present invention is to realize like this, a device for testing rock core permeability, the device of this testing rock core permeability comprises: core holding unit, differential pressure pick-up, the first outlet, the second outlet, the first switch, the 3rd switch, second switch, digital display meter, core holding unit outlet, core holding unit import;
Differential pressure pick-up connects core holding unit, the first outlet is arranged on the left side of differential pressure pick-up bottom, the second outlet is arranged on the right side of differential pressure pick-up bottom, the first switch is arranged on the left side of the first outlet, second switch is arranged on the right side of the second outlet, and the 3rd switch is arranged between the first switch and second switch, and digital display meter is arranged on the upper right side of differential pressure pick-up, core holding unit outlet is arranged on the right side of core holding unit, and core holding unit import is arranged on the left side of core holding unit.
Further, differential pressure pick-up connects core holding unit by the first outlet, the second outlet core holding unit import and core holding unit export.
Further, the side pressure of 20MPa is born at the two ends of differential pressure pick-up, the depth of reservoirs of simulation 1000m~2000m.
Further, differential pressure pick-up can collect the pressure difference value between 0KPa~100KPa, and precision is 0.5%, and data drift value can be controlled at 100*0.5%=0.5KPa, differential pressure pick-up is replaceable is simultaneously different ranges, to meet the test needs of different rock samples.
The device of testing rock core permeability provided by the invention, by differential pressure pick-up is set, 20MPa side pressure can be born in the two ends of differential pressure pick-up, can simulate the depth of reservoirs of 1000m-2000m left and right, collect the pressure difference value between 0-100KPa, and precision is 0.5%, and data drift value can be controlled at 100*0.5%=0.5KPa.The present invention has reduced the error of core permeability proving installation, has improved the precision of core permeability proving installation, has expanded the measurement range of core permeability proving installation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of the testing rock core permeability that provides of the embodiment of the present invention;
In figure: 1, core holding unit; 2, differential pressure pick-up; 3, the first outlet; 4, the second outlet; 5, the first switch; 6, the 3rd switch; 7, second switch; 8, digital display meter; 9, core holding unit outlet; 10, core holding unit import.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the device of the testing rock core permeability of the embodiment of the present invention is mainly comprised of core holding unit 1, differential pressure pick-up 2, first outlet 3, second outlet the 4, first switch 5, the 3rd switch 6, second switch 7, digital display meter 8, core holding unit outlet 9, core holding unit import 10;
Differential pressure pick-up 2 is by the first outlet 3, the core holding unit outlet 9 of the second outlet 4 and core holding unit 1 is connected with core holding unit import 10, the first outlet 3 is arranged on the left side of differential pressure pick-up 2 bottoms, the second outlet 4 is arranged on the right side of differential pressure pick-up 2 bottoms, the first switch 5 is arranged on the left side of the first outlet 3, second switch 7 is arranged on the right side of the second outlet 4, the 3rd switch 6 is arranged between the first switch 5 and second switch 7, digital display meter 8 is arranged on the upper right side of differential pressure pick-up 2, core holding unit outlet 9 is arranged on the right side of core holding unit 1, core holding unit import 10 is arranged on the left side of core holding unit 1,
20MPa side pressure can be born in the two ends of differential pressure pick-up 2 of the present invention, can simulate the depth of reservoirs of 1000m~2000m left and right; Can collect the pressure difference value between 0KPa~100KPa again, and precision is 0.5%, data drift value can be controlled at 100*0.5%=0.5KPa.
Concrete operation method of the present invention:
The first step, before testing, first connects the first outlet 3, the second outlet 4, core holding unit outlet 9, core holding unit import 10, rock core is put into rock core and add and hold device 1 the inside, starts to carry out displacement with test medium (local water etc.);
Second step, is connected with core holding unit outlet 9 differential pressure pick-up 2 compression fittings respectively with core holding unit import 10, open the first switch 5 and second switch 7, closes the 3rd switch 6(and blocks the first switch 5 and second switch 7);
The 3rd step, utilizes the pressure differential (being rock core entrance end pressure differential) at digital display meter 8 record the first switches 5 and second switch 7 two ends, and by the data transmission obtaining to computing machine;
The 4th step, uses computer program to calculate in real time the permeability size of rock core, by observing the numerical value calculating in computing machine, is convenient to understand actual change situation.
In the 3rd step, the first outlet 3 of differential pressure pick-up 2 is connected with core holding unit outlet 9 with the core holding unit import 10 of core holding unit 1 respectively with the second outlet 4, open the first switch 5 and second switch 7, close the 3rd switch 6(and block the first switch 5 and second switch 7), the pressure of protecting the pressure at rock core two ends and the first switch 5 of differential pressure pick-up 2 and second switch 7 places is the same, closing the 3rd switch 6 is to be communicated with the first switch 5 and second switch 7 because open the 3rd switch 6, there will not be pressure differential.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (4)

1. the device of a testing rock core permeability, it is characterized in that, the device of this testing rock core permeability comprises: core holding unit, differential pressure pick-up, the first outlet, the second outlet, the first switch, the 3rd switch, second switch, digital display meter, core holding unit outlet, core holding unit import;
Differential pressure pick-up connects core holding unit, the first outlet is arranged on the left side of differential pressure pick-up bottom, the second outlet is arranged on the right side of differential pressure pick-up bottom, the first switch is arranged on the left side of the first outlet, second switch is arranged on the right side of the second outlet, and the 3rd switch is arranged between the first switch and second switch, and digital display meter is arranged on the upper right side of differential pressure pick-up, core holding unit outlet is arranged on the right side of core holding unit, and core holding unit import is arranged on the left side of core holding unit.
2. the device of testing rock core permeability as claimed in claim 1, is characterized in that, core holding unit import and core holding unit that differential pressure pick-up connects core holding unit by the first outlet, the second outlet export.
3. the device of testing rock core permeability as claimed in claim 1, is characterized in that, the side pressure of 20MPa is born at the two ends of differential pressure pick-up, the depth of reservoirs of simulation 1000m~2000m.
4. the device of testing rock core permeability as claimed in claim 1, it is characterized in that, differential pressure pick-up can collect the pressure difference value between 0KPa~100KPa, and precision is 0.5%, be that data drift value can be controlled at 100*0.5%=0.5Kpa, differential pressure pick-up is replaceable is simultaneously different ranges, to meet the test needs of different rock samples.
CN201310521785.2A 2013-10-29 2013-10-29 A kind of device of testing rock core permeability CN103543091B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102455277A (en) * 2010-10-22 2012-05-16 中国石油化工股份有限公司 Device and method for measuring gasometry permeability of rock under high pressure
CN103257089A (en) * 2013-04-08 2013-08-21 中国石油天然气股份有限公司 Pressure pulse measurement device and method for measurement of matrix and fracture permeability by the same
CN203249841U (en) * 2013-05-29 2013-10-23 武汉大学 Hypotonic rock transient air pressure pulse permeability measuring device
CN203643301U (en) * 2013-10-29 2014-06-11 西南石油大学 Device for measuring rock core permeability

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102455277A (en) * 2010-10-22 2012-05-16 中国石油化工股份有限公司 Device and method for measuring gasometry permeability of rock under high pressure
CN103257089A (en) * 2013-04-08 2013-08-21 中国石油天然气股份有限公司 Pressure pulse measurement device and method for measurement of matrix and fracture permeability by the same
CN203249841U (en) * 2013-05-29 2013-10-23 武汉大学 Hypotonic rock transient air pressure pulse permeability measuring device
CN203643301U (en) * 2013-10-29 2014-06-11 西南石油大学 Device for measuring rock core permeability

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
董成林: "多功能岩心驱替仪的研制", 《万方学位论文》, 26 April 2013 (2013-04-26), pages 23 *
董成林等: "多功能岩心驱替仪控制系统设计", 《机械工程与自动化》, no. 3, 30 June 2012 (2012-06-30), pages 109 - 111 *

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Inventor after: Sun Fujie

Inventor after: Xiong Yu

Inventor after: Zhou Wensheng

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Inventor after: Feng Kai

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