CN204575498U - A kind of perm-plug method device measuring flow in low permeability core - Google Patents
A kind of perm-plug method device measuring flow in low permeability core Download PDFInfo
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- CN204575498U CN204575498U CN201520193018.8U CN201520193018U CN204575498U CN 204575498 U CN204575498 U CN 204575498U CN 201520193018 U CN201520193018 U CN 201520193018U CN 204575498 U CN204575498 U CN 204575498U
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Abstract
The utility model provides a kind of perm-plug method device measuring flow in low permeability core.This device comprises core holding unit, and described core holding unit side is connected with T-valve, the first supercharge pump and nitrogen cylinder in turn, and opposite side is disposed with the second supercharge pump, four-way valve and soap film flowmeter; Described T-valve and described four-way valve are connected to a pressure transducer, and described core holding unit is also connected with a high pressure hand-operated volume pump, and described volume pump is provided with tapping valve, is provided with ring pressure valve between described volume pump and described core holding unit.This device is easy to operate, and measurement data is reproducible, and experimental error is little, cost is low, can slippage effect be eliminated in error allowed band, thus the absolute permeability of rock core can be obtained fast and accurately, reduce the relative error of core permeability to greatest extent.
Description
Technical field
The utility model relates to oil-field development rock core perm-plug method field, particularly relates to a kind of perm-plug method measurement mechanism measuring flow in low permeability core.
Background technology
Permeability is exploitation and parameter important in evaluating, and along with deepening continuously of Reservoir Development, the research of flow in low permeability core physical property more and more becomes the object that people pay close attention to.In formulation oilfield development program process, first need the experiment carrying out measuring perm-plug method, evaluate the absolute permeability of rock core to be measured.Overall goal utilizes two key parameters in experimental provision mensuration Darcy formula: the volumetric flow rate of pressure reduction, the under atmospheric pressure gas at rock core two ends to be measured.Conventional experimental technique is: utilize experimental provision to record the intake pressure (top hole pressure is atmospheric pressure) at five to ten group rock core two ends, the volumetric flow rate data of gas in rock core.Then utilize Darcy formula to calculate permeability corresponding to each point respectively, recycling least square method obtains regression straight line, and the intercept of this straight line is just clancy behavior scale.But in experimentation, under higher inlet pressure conditions, easily there is turbulent flow in detected fluid in the synthetic core that permeability is low, and one of applicable prerequisite of Darcy formula be detected fluid in tested rock core for linear flow.Existing solution is that the initial set value of intake pressure is tried one's best from low pressure values, to ensure that detected fluid flows at tested rock core neutral line.But problem still exists: in the intake pressure of the flow in low permeability core 1. obtained by experiment, rock core, the data point of the volumetric flow rate of gas is few in number, if there is error in reading or misoperation in experimentation, all extreme influence can be produced to experimental result.2. the gas logging permeability experiment of low permeability cores is consuming time longer, can not do hundreds and thousands of experiments, also just cannot reduce relative error to greatest extent to same rock core.3. clancy behavior scale is the build-in attribute of rock core corresponding in extreme pressure situation, if can when ensureing linear flow, intake pressure can be made again infinitely great, then the permeability obtained be more close to clancy behavior scale.But this cannot be realized by existing experiment condition certainly.
Utility model content
The utility model provides a kind of perm-plug method device measuring flow in low permeability core, and this device is fast easy to use, and error is less.Under ensureing that in core holding unit, fluid is linear flow situation, energy can be provided to core holding unit gateway.
The perm-plug method device of measurement flow in low permeability core of the present utility model, described device comprises core holding unit, described core holding unit side is connected with T-valve, the first supercharge pump and nitrogen cylinder in turn, and opposite side is disposed with the second supercharge pump, four-way valve and soap film flowmeter.The reason that entrance adds supercharge pump is: nitrogen cylinder can provide at most the pressure of 7-8 MPa, if when top hole pressure requires enough high, we just take the supercharge pump opening porch, and the compressed gas source of supercharge pump chooses nitrogen.Supercharge pump maximum boost is set and can reaches 20MPa, to ensure that experiment can be carried out under high-pressure situations, rock core blessing device inlet pressure difference can be controlled constant simultaneously, ensure that in rock core, fluid is linear flow.When rock sample outlet pressures is atmospheric pressure, slippage effect is remarkable, and permeability reduces with the rising of mean pressure; When outlet pressures increases to a particular value, Ka and 1/p
mvariation relation be a horizontal line (p
mmean pressure for rock core is imported and exported), the pressure of now rock core endpiece is defined as threshold pressure, and now under different pressure reduction, recording gas permeability value is stationary value, and amplitude of variation is little, can be equivalent to liquid and survey permeability.The utility model utilizes supercharge pump to increase entrance and top hole pressure simultaneously, and while increase rock core gateway end pressure, also constant pressure reduction, reaches the object eliminating slippage effect completely.
Described T-valve and described four-way valve are connected to a pressure transducer, and the accuracy of sensor is 0.1 grade, after stability of flow survey steady pressure error and be no more than 0.1%.Described core holding unit is also connected with a volume pump, and described volume pump is provided with tapping valve, is provided with ring pressure valve between described volume pump and described core holding unit.Volume pump provides confined pressure (ring pressure) for core holding unit, requires that the compressibility of fluid implementing confined pressure is little, must ensure that rock core confined pressure fluid is monophasic fluid.
Wherein, as preferably, described core holding unit comprises cylindrical shell, be arranged on the rock core sleeve in described cylindrical shell, and be arranged on the sheath of described cylindrical shell both sides, described cylindrical shell is provided with the through hole for connecting described volume pump, described sheath is arranged on after on described cylindrical shell, coordinates form sealed cavity with described rock core sleeve.Preferred, described rock core sleeve is rubber sleeve.
Wherein, as preferably, this device also comprises copper sheathing and O-ring seal, and described O-ring seal and described copper sheathing are arranged in the breach of described sheath from inside to outside successively, and described O-ring seal and described cylindrical shell and described sheath close contact.
Preferably, described volume pump is high pressure hand-operated volume pump.
Open nitrogen, by clean for air purge in pipeline; Gather rock core cross-sectional area to be measured and length, and rock core to be measured is clamped on core holding unit; Control intake pressure and the top hole pressure of core holding unit by adjusting the first supercharge pump and the second supercharge pump, and gather the data of gage pressure value and flowmeter;
The device of perm-plug method of the present utility model, the absolute permeability of flow in low permeability core can be obtained fast and accurately, thus decrease the repeatability of experimental study, reduce the research cost to core permeability research, but also reduce the relative error of core permeability to greatest extent, to a certain degree can reflect the build-in attribute that permeability is rock core; Contribute to improving people to the understanding of hydrocarbon-bearing pool, the development effectiveness contributing to improving maturing field finds and exploitation with quickening new district simultaneously.
Accompanying drawing explanation
Fig. 1 is the experiment flow figure of the mensuration perm-plug method that the utility model uses;
In figure, 1-nitrogen cylinder, 2-decompression venting valve, 3,7-pressure transducer, 4-T-valve, 5-rock core, 6-core holding unit, 8-four-way valve, 9-soap film flowmeter, 10-high pressure hand-operated volume pump, 11-tapping valve, 12-ring pressure valve, 13,14-pressure charging valve.
Fig. 2 is the sectional view of core holding unit;
In figure, 15-copper sheathing, 16-sheath, 17-rock core rubber sleeve, 18-O-ring seal, 19-through hole, 20-cylindrical shell.
Embodiment
Below in conjunction with the embodiment in the utility model and accompanying drawing, clear, complete description is carried out to the technical scheme in the utility model embodiment.
Embodiment 1
A kind of perm-plug method device measuring flow in low permeability core, as shown in Figure 1, this device comprises core holding unit 6, and core holding unit side is connected with T-valve 4, first supercharge pump 13 and nitrogen cylinder 1 in turn, and opposite side is disposed with the second supercharge pump 14, four-way valve 8 and soap film flowmeter 9; T-valve 4 is connected with pressure transducer 3, four-way valve 8 is connected with pressure transducer 7, core holding unit 6 is also connected with high pressure hand-operated volume pump 10, and this high pressure hand-operated volume pump 10 is provided with tapping valve 11, is provided with ring pressure valve 12 between high pressure hand-operated volume pump 10 and core holding unit 6.
As shown in Figure 2, core holding unit 8 comprises cylindrical shell 20, be arranged on the rock core rubber sleeve 17 in cylindrical shell 20, and be arranged on the sheath 16 of cylindrical shell 20 both sides, cylindrical shell 20 is provided with the through hole 19 for connecting volume pump 11, sheath 16 is arranged on after on cylindrical shell 20, coordinates form sealed cavity with rock core rubber sleeve 17.
This flow in low permeability core perm-plug method device also comprises copper sheathing 15 and O-ring seal 18, and O-ring seal 18 and copper sheathing 15 are arranged in the breach of sheath 16 from inside to outside successively, and O-ring seal 18 and cylindrical shell 20 and sheath 16 close contact.This flow in low permeability core perm-plug method device is pressurizeed by high pressure hand-operated volume pump 10, makes rock core 5 and rock core rubber sleeve 17 close contact, ensures that fluid is not from the channelling of rock core wall.
Open nitrogen, by clean for air purge in pipeline.Survey rock core 5 cross section to be measured length and width with vernier caliper, calculate cross-sectional area A.Measure rock core 5 length L.Then rock core 5 is put into the rock core rubber sleeve 17 of core holding unit 6, with sheath 16, rock core 5 is sealed in rock core rubber sleeve 17.Open high pressure hand-operated volume pump 10, ring pressure valve 12 again, discharge the gas in core holding unit annular space, close tapping valve 11, turn clockwise high pressure hand-operated volume pump 10 foreign steamer, is forced into 5MPa, closes closed loop pressure valve 12.Open decompression venting valve 2, first supercharge pump 13 of nitrogen cylinder 1, T-valve 4, second supercharge pump 14, four-way valve 8, obtain rock core intake pressure P by pressure transducer 3
1, pressure transducer 7 reads out mouth pressure P
2, read atmospheric pressure value at that time with barometer.Choose the inlet pressure meeting Darcy's law condition, record ten groups of experimental datas, then do one group of parallel laboratory test, under reducing this situation, obtain the systematic error of experimental data.Air volume Q is recorded again by soap film flowmeter 9
0.Finally calculate perm-plug method by Darcy formula:
In formula, K
g--gas permeability, D;
Q
0--the gas flow of rock core endpiece, mL/s;
P
0--atmospheric pressure (definitely), MPa;
Gas viscosity under μ--experimental temperature and atmospheric pressure, mPas;
L--rock core length, cm;
The cross-sectional area of A--rock core, cm;
P
1--the absolute pressure of core entry end, MPa;-
P
2--the absolute pressure of rock core endpiece, MPa.―
Above-mentioned embodiment is intended to illustrate that the utility model can be professional and technical personnel in the field and realizes or use; modifying to above-mentioned embodiment will be apparent for those skilled in the art; therefore the utility model includes but not limited to above-mentioned embodiment; any these claims or instructions of meeting describes; meet and principle disclosed herein and novelty, the method for inventive features, technique, product, all fall within protection domain of the present utility model.
Claims (5)
1. measure the perm-plug method device of flow in low permeability core for one kind, it is characterized in that, described device comprises core holding unit, and described core holding unit side is connected with T-valve, the first supercharge pump and nitrogen cylinder in turn, and opposite side is disposed with the second supercharge pump, four-way valve and soap film flowmeter; Described T-valve and described four-way valve are connected to a pressure transducer, and described core holding unit is also connected with a high pressure hand-operated volume pump, and described volume pump is provided with tapping valve, is provided with ring pressure valve between described volume pump and described core holding unit.
2. the perm-plug method device of measurement flow in low permeability core according to claim 1, is characterized in that, the accuracy of described pressure transducer is 0.1 grade, after stability of flow survey steady pressure error and be no more than 0.1%.
3. the perm-plug method device of measurement flow in low permeability core according to claim 1, it is characterized in that, described core holding unit comprises cylindrical shell, be arranged on the rock core sleeve in described cylindrical shell, and be arranged on the sheath of described cylindrical shell both sides, described cylindrical shell is provided with the through hole for connecting described volume pump, described sheath is arranged on after on described cylindrical shell, coordinates form sealed cavity with described rock core sleeve.
4. the perm-plug method device of measurement flow in low permeability core according to claim 3, it is characterized in that, also comprise copper sheathing and O-ring seal, described O-ring seal and described copper sheathing are arranged in the breach of described sheath from inside to outside successively, and described O-ring seal and described cylindrical shell and described sheath close contact.
5. the perm-plug method device of measurement flow in low permeability core according to claim 3, is characterized in that, described rock core sleeve is rubber sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520193018.8U CN204575498U (en) | 2015-04-01 | 2015-04-01 | A kind of perm-plug method device measuring flow in low permeability core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193018.8U CN204575498U (en) | 2015-04-01 | 2015-04-01 | A kind of perm-plug method device measuring flow in low permeability core |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158142A (en) * | 2015-09-16 | 2015-12-16 | 中国烟草总公司郑州烟草研究院 | Detection method for permeability of cigarette burning cone |
| CN107703039A (en) * | 2017-09-22 | 2018-02-16 | 中国石油大学(北京) | Rock permeability measurement apparatus |
| CN108195737A (en) * | 2017-12-21 | 2018-06-22 | 中国林业科学研究院木材工业研究所 | A kind of gas permeability of wood analysis test apparatus |
| CN110455694A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | A kind of rock sample permeability determination method |
-
2015
- 2015-04-01 CN CN201520193018.8U patent/CN204575498U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158142A (en) * | 2015-09-16 | 2015-12-16 | 中国烟草总公司郑州烟草研究院 | Detection method for permeability of cigarette burning cone |
| CN107703039A (en) * | 2017-09-22 | 2018-02-16 | 中国石油大学(北京) | Rock permeability measurement apparatus |
| CN108195737A (en) * | 2017-12-21 | 2018-06-22 | 中国林业科学研究院木材工业研究所 | A kind of gas permeability of wood analysis test apparatus |
| CN110455694A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | A kind of rock sample permeability determination method |
| CN110455694B (en) * | 2018-05-08 | 2022-03-29 | 中国石油天然气股份有限公司 | Rock sample permeability determination method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160401 |