CN104749321A - Shale gas desorption pressure tester - Google Patents

Shale gas desorption pressure tester Download PDF

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Publication number
CN104749321A
CN104749321A CN201510029870.6A CN201510029870A CN104749321A CN 104749321 A CN104749321 A CN 104749321A CN 201510029870 A CN201510029870 A CN 201510029870A CN 104749321 A CN104749321 A CN 104749321A
Authority
CN
China
Prior art keywords
pressure
shale gas
shale
cylinder
tester
Prior art date
Application number
CN201510029870.6A
Other languages
Chinese (zh)
Inventor
龚大建
张绍雄
张媛
岳鹏飞
朱冰川
李飞
尹富平
李鹏
Original Assignee
铜仁中能天然气有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 铜仁中能天然气有限公司 filed Critical 铜仁中能天然气有限公司
Priority to CN201510029870.6A priority Critical patent/CN104749321A/en
Publication of CN104749321A publication Critical patent/CN104749321A/en

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Abstract

The invention provides a shale gas desorption pressure tester. The tester mainly comprises a cylinder body, a base, an upper cover, a high-pressure micropump and a pressure sensor, wherein a glass observing window is arranged on the cylinder body; the pressure sensor is installed on the upper cover; a liquid inlet is formed in the central position of the upper cover; the upper cover is connected with the high-pressure micropump. Saturated brine with temperature consistent with the formation temperature is continuously added to the cylinder body in which shale cores are put and the value of pressure in the cylinder body immediately rises, linear bubbles generated in quantity because of desorption escape of adsorbed shale gases adsorbed on the surface of shale and in micropores can be observed from the observing window, when the linear bubbles begin reducing, the corresponding pressure value is the initial shale gas desorption pressure, and when the linear bubbles begin reducing in quantity, the corresponding pressure value is the main shale gas desorption pressure. The shale gas desorption pressure tester has the beneficial effects that adopting the direct measurement mode, compared with the prior art, the tester is more reliable and accurate in data, also has the effect of greatly shortening the experimental determination time and provides powerful guarantees for shortening the project period and ensuring the technology and economical efficiency of exploitation.

Description

Shale gas desorption pressures tester
Technical field
The present invention relates to a kind of shale gas desorption pressures tester.
Background technology
Shale gas refers to the rock gas in the organic mud shale of richness and interlayer, and the shale gas exploited from shale, based on free state and ADSORPTION STATE, approximately respectively accounts for 50%, only has minute quantity to be stored in kerogen, bituminous matter and oil with solubilised state.Different from conventional gas and oil, shale gas does not form trap, needs horizontal well and extensive waterfrac treatment just can carry out the economic exploitation, in recovery process, after shale is pressed off by waterfrac treatment, first free state shale gas can overflow, then, along with the reduction of frac pressure, the ADSORPTION STATE shale gas be adsorbed in shale surface and interlayer starts desorb, and enters gas production passage, therefore, desorption pressures calculates and tests in shale gas exploitation very important, directly affects technique and the economy of shale gas exploitation.
At present, both at home and abroad the mensuration of shale gas desorption pressures is generally carried out in the lab, by adsorption isotherm experiment curve determination shale gas critical desorption pressures, then calculate shale gas desorption pressures in conjunction with the air content of actual measurement, but there is following problem in this experimental determining method:
1) accuracy
Generally to enter at shale core laboratory just can obtain desorption pressures result of calculation after 2 months, extend construction period, affect project progress.
2) effective
Shale gas adsorption isotherm experiment is according under certain container pressure, in container, the nitrogen adsorption amount on slate flour surface calculates, experimentation is in fact adsorption process, but not desorption process, therefore, oppositely calculate that the experimental principle of critical desorption pressures value inherently lacks reliability, accuracy with adsorption isotherm experiment, and it is just more inaccurate to be combined by Critical desorption pressure the desorption pressure value calculated with air content data.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of shale gas desorption pressures tester, direct experiment mode is adopted to measure shale gas desorption pressures, instead of the indirect calculation mode that prior art generally adopts, easy and simple to handle, measure efficiency high, data measured is accurate, solve the cycle that shale gas adsorption isotherm experiment exists long, the technical matters such as efficiency is low, data are inaccurate, for engineering is implemented to provide powerful guarantee smoothly.
The present invention is with when shale core is immersed in saturated brine, the ADSORPTION STATE shale gas be adsorbed in shale surface and micropore can overflow this phenomenon for foundation with the form desorb of wire bubble, realize by the following technical solutions: a kind of shale gas desorption pressures tester, form primarily of cylinder body, base, upper cover, high pressure micro pump, pressure transducer, cylinder body is provided with glass window mouth, pressure transducer is arranged on and covers, upper cover center is provided with inlet, and is connected with high pressure micro pump.
Beneficial effect of the present invention is: 1) change former adsorption isotherm experiment from principle and oppositely calculate shale gas critical desorption pressures by adsorption isotherm experiment curve, combine the process of actual measurement air content indirect calculation shale gas desorption pressures again, directly to measure replacement indirect calculation, make data more reliable, accurate; 2) substantially reducing the measuring time of shale gas desorption pressures, in 1 ~ 2 hour, just can obtain the shale gas desorption pressures data of shale core, for shortening construction period, guaranteeing that the technique of exploitation and economy provide powerful guarantee.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows:
Fig. 1 is structural representation of the present invention.
1 inlet; 2 upper covers; 3 cylinder bodies; 4 watch windows; 5 bases; 6 high pressure micro pumps; 7 pressure transducers.
Embodiment
The saturated brine consistent with formation temperature is added in cylinder body 3, and shale core is inserted in cylinder body 3, after tightening upper cover 2, can be observed a large amount of wire bubbles produced because the ADSORPTION STATE shale gas desorb be adsorbed in shale surface and micropore is overflowed from glass window mouth 4, the reading of pressure transducer 7 is cylinder interior pressure; Now start high pressure micro pump 6, in cylinder body 3, identical saturated brine is injected with certain flow by inlet 1, force value in cylinder body 3 raises immediately, when rising to certain value, find that the wire bubble on shale core surface starts to reduce gradually by watch window 4, then now the registration of pressure transducer 7 is the initial desorption pressures of shale gas; Along with saturated brine continues to inject, in cylinder body 3, pressure continues to increase, and when being found that by glass window mouth 4 the wire bubble on shale core surface starts a large amount of minimizing, then now the reading of pressure transducer 7 is shale gas primary desorption pressure.

Claims (3)

1. a shale gas desorption pressures tester, it is characterized in that: form primarily of cylinder body (3), base (5), upper cover (2), high pressure micro pump (6) and pressure transducer (7), cylinder body (3) is provided with watch window (4), pressure transducer (7) is arranged on upper cover (2), upper cover (2) center is provided with inlet (1), is connected with high pressure micro pump (6).
2. shale gas desorption pressures tester as claimed in claim 1, is characterized in that: described observation window (4) is inlaid with glass.
3. shale gas desorption pressures tester as claimed in claim 1, is characterized in that: described upper cover (2) is tightened by screw thread and O-ring seal and cylinder body (3), sealed.
CN201510029870.6A 2015-01-21 2015-01-21 Shale gas desorption pressure tester CN104749321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510029870.6A CN104749321A (en) 2015-01-21 2015-01-21 Shale gas desorption pressure tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510029870.6A CN104749321A (en) 2015-01-21 2015-01-21 Shale gas desorption pressure tester

Publications (1)

Publication Number Publication Date
CN104749321A true CN104749321A (en) 2015-07-01

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CN201510029870.6A CN104749321A (en) 2015-01-21 2015-01-21 Shale gas desorption pressure tester

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108663498A (en) * 2017-03-27 2018-10-16 中国石油化工股份有限公司 The shale gas site desorption experimental provision and method of high temperature decompression and pressure break

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Publication number Priority date Publication date Assignee Title
WO2009018999A2 (en) * 2007-08-08 2009-02-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Material transport and event monitoring in systems featuring piezoelectrically activated emission of droplets, and possible combinations of a matrix and material to be metered
CN101387594A (en) * 2008-09-12 2009-03-18 煤炭科学研究总院西安研究院 Coalbed gas high pressure desorption instrument
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WO2011007280A2 (en) * 2009-07-13 2011-01-20 Koninklijke Philips Electronics N.V. Measuring molecular contamination in vacuum environments
CN102162785A (en) * 2011-01-11 2011-08-24 中国石油天然气股份有限公司 High-temperature high-pressure adsorption tester
CN204101357U (en) * 2014-08-12 2015-01-14 中国石油化工股份有限公司 Heating desorption tank

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101743377A (en) * 2007-07-19 2010-06-16 普拉德研究及开发股份有限公司 In situ determination of critical desorption pressures
WO2009018999A2 (en) * 2007-08-08 2009-02-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Material transport and event monitoring in systems featuring piezoelectrically activated emission of droplets, and possible combinations of a matrix and material to be metered
CN101387594A (en) * 2008-09-12 2009-03-18 煤炭科学研究总院西安研究院 Coalbed gas high pressure desorption instrument
WO2011007280A2 (en) * 2009-07-13 2011-01-20 Koninklijke Philips Electronics N.V. Measuring molecular contamination in vacuum environments
CN102162785A (en) * 2011-01-11 2011-08-24 中国石油天然气股份有限公司 High-temperature high-pressure adsorption tester
CN204101357U (en) * 2014-08-12 2015-01-14 中国石油化工股份有限公司 Heating desorption tank

Non-Patent Citations (3)

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中华人民共和国煤炭工业部: "《中华人民共和国煤炭行业标准MT/T77-94》", 1 July 1994 *
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薛晓辉 等: "常规取心过程中页岩含气量解吸测定分析及建议", 《2013年煤层气学术研讨会论文集》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108663498A (en) * 2017-03-27 2018-10-16 中国石油化工股份有限公司 The shale gas site desorption experimental provision and method of high temperature decompression and pressure break

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Application publication date: 20150701

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