CN103808641A - Determination method for permeability of core matrix - Google Patents
Determination method for permeability of core matrix Download PDFInfo
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- CN103808641A CN103808641A CN201210483454.XA CN201210483454A CN103808641A CN 103808641 A CN103808641 A CN 103808641A CN 201210483454 A CN201210483454 A CN 201210483454A CN 103808641 A CN103808641 A CN 103808641A
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- rock core
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- core matrix
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Abstract
The invention discloses a determination method for the permeability of a core matrix. The determination method comprises the following steps: (a) firstly, preparing a flowing medium for later use; (b) preparing a core to be tested for later use; (c) extruding a certain quantity of the flowing medium into the core from a reversed end of a core clamping device and carrying out displacement, wherein the flowing speed of the flowing medium is lower than a critical flowing speed; (d) carrying out the displacement until the flow and the pressure difference are stable, wherein the stable time is not less than 50-70 minutes; (e) enabling the flowing medium of a water injection well to enter the core from an entrance of the positive end of the core clamping device; and (f) collecting the volume of the flowing medium passing through the core, and comparing the initial use quantity of the flowing medium with the volume of the flowing medium passing through the core so as to obtain the permeability of the core matrix. The determination method can be used for rapidly determining the permeability of the core matrix; the testing result is accurate and the testing steps are simple; the determination method is convenient to operate and the testing cost of the permeability of the core matrix is greatly reduced.
Description
Technical field
The present invention relates to a kind of assay method of rock core matrix permeability.
Background technology
Rock core, according to the needs of geology preliminry basic research or engineering, uses ring-type hollow bit and other coring tools, from the cylindric rock sample taking out in hole.The ore rock or the ore that from the ore body of Solid Mineral or ore bed, take out, claim the ore deposit heart.Rock core is research and the geologic information important in kind of understanding subsurface geology and mineral products situation.
In ore prospecting and performance history, need to, by the stratigraphic horizon of geological design and the degree of depth, carry out and creep into, in well, be lowered to coring tool, the rock sample drilling through out.Rock core is to understand subsurface formations and contain directly perceived, the most most realistic data of ore deposit feature.There are two kinds of modes of sidewall sampling and drilling and coring delivery, conventionally take the latter as main.
Within the scope of oil field, must select appropriate well, to relevant oil, gas-bearing formation position, drill through the rock core of some, by observing, analyze and research, can understand: the 1. epoch on stratum, lithology, deposition characteristics; 2. the physics of reservoir, chemical property and oil-containing, gas, aqueous condition; 3. petroleum source bed feature and source rock index; 4. underground structure situation (as tomography, joint, inclination angle etc.); 5. the basic data of qualitative, the quantitative interpretation of various logging methods; 6. oil, gas, water sport and distribution situation in recovery process, and the variation of stratal configuration; Rock core also can supply the laboratory experiment analysis of water filling or various raising recovery ratio method and volume increase, well stimulation, is the requisite basic data of estimation petroleum reserves, establishment reasonable development scheme, raising reservoir waterflooding effect and recovery ratio.
For obtaining irreducible water saturation, thereby ask accurate initial oil saturation, use oil-base mud coring (seeing drilling fluid) more.For checking the oil, the water saturation that have changed after exploitation.The sealing core drill technique of China's widespread use sealing fluid protection rock core.USA in recent years has developed maintenance pressure coring, makes the rock core taking out neither be subject to mud influence, can keep again the fluid saturation under condition of formation pressure.But this method complex process, cost is high.Rock core is a very important geological archive data, should have specialized facilities to preserve for a long time, for frequent research.
In complete rock stratum, creep into, because the rock core taking out is more complete, core recovery percentage and percentage of head rice do not have any difference, give attention therefore general few.But in the troublesome zone drilling of weak broken, difference taking rate and percentage of head rice are just very important.
Core recovery percentage, refers to the quantity of taking of rock core, its objective is the quality in order to explanation probing work quality.Taking rate is high, and the sample taking out in boring is many, represents that to a certain extent method of operating is good, and technical merit is high; Taking rate is low, stratum drilled pass by, but take out sample little, the of poor quality of probing work is described to a certain extent, method of operating is not right, technical merit is low.
Percentage of head rice, refers to the integrated degree of rock core, its objective is to show the engineering geological condition quality on stratum.Percentage of head rice is higher, and the stratum of boring is more complete, and rock strength is high; Otherwise, the stratum weak broken that expression was bored, rock strength is low, the features as poor geologic condition of namely conventionally saying, geological condition is very complicated.
Taking rate is the number percent of institute's coring total length and this footage per round trip.Total length can be close together after referring to that rock core takes out, and the amount of being combined length, can not be combined, and pack in the short basket of same specification and measure length, finally two kinds of length will be added together.
Percentage of head rice, is in the rock core taking out, and only selects its one-tenth cylindricality, that can synthesize cylindricality and circular sheet, measures total length and must compare with this footage per round trip, represents with percentage.Broken rock core, filling material and the folder mud etc. that can not be close together, do not count, and therefore, at the bad ground of weak broken, percentage of head rice is all lower than taking rate; In extremely serious broken tomography folder mud, creep into, even may taking rate reach 100%, and percentage of head rice is 0.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of assay method of rock core matrix permeability is provided, the method can test out the permeability of rock core matrix fast, and test result is accurate, testing procedure is simple, convenient operation, greatly reduces the testing cost of rock core matrix permeability.
Object of the present invention is achieved through the following technical solutions: a kind of assay method of rock core matrix permeability, comprises the following steps:
(a) first, prepare flow media for subsequent use;
(b) then, prepare rock core to be tested for subsequent use;
(c) get a certain amount of flow media and clamp-on rock core from core holding unit backward end and carry out displacement, the flow velocity of flow media is lower than critical flow velocity;
(d) until flow and pressure reduction are stable, be no less than 50～70min stabilization time;
(e) flow media of water injection well should enter rock core from core holding unit forward end entrance;
(f) collect by the flow media volume of rock core, by the initial content of flow media relatively with by the volume of rock core, thereby draw the permeability of rock core matrix.
In described step (a), flow media selection standard salt solution or kerosene.
The detailed process of described step (b) is: rock core is toasted after 1～2h under the high temperature of 300～400 ℃ to vacuum outgas 1～3h; Then use normal saline solution or kerosene saturated core after degassed, rear for subsequent use.
The baking temperature of described rock core is 350 ℃.
The baking time of described rock core is 1.5h.
Vacuum outgas 2h.
In described step (d), be no less than 60min stabilization time.
In sum, the invention has the beneficial effects as follows: can test out fast the permeability of rock core matrix, and test result is accurate, testing procedure is simple that convenient operation greatly reduces the testing cost of rock core matrix permeability.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The assay method of a kind of rock core matrix permeability the present invention relates to, its concrete steps are as follows:
(a) first, prepare flow media for subsequent use;
(b) then, prepare rock core to be tested for subsequent use;
(c) get a certain amount of flow media and clamp-on rock core from core holding unit backward end and carry out displacement, the flow velocity of flow media is lower than critical flow velocity;
(d) until flow and pressure reduction are stable, be no less than 50～70min stabilization time;
(e) flow media of water injection well should enter rock core from core holding unit forward end entrance;
(f) collect by the flow media volume of rock core, by the initial content of flow media relatively with by the volume of rock core, thereby draw the permeability of rock core matrix.
In described step (a), flow media selection standard salt solution or kerosene.
The detailed process of described step (b) is: rock core is toasted after 1～2h under the high temperature of 300～400 ℃ to vacuum outgas 1～3h; Then use normal saline solution or kerosene saturated core after degassed, rear for subsequent use.
The baking temperature of described rock core is 350 ℃.
The baking time of described rock core is 1.5h.
Vacuum outgas 2h.
In described step (d), be no less than 60min stabilization time.
The result being recorded by said method is as shown in the table:
As seen from the above table, the core permeability that experiment is selected is faint, is less than the requirement of industry standard 30%, meets the requirement of low permeability formation pressure break.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.
Claims (7)
1. the assay method of rock core matrix permeability, is characterized in that, comprises the following steps:
(a) first, prepare flow media for subsequent use;
(b) then, prepare rock core to be tested for subsequent use;
(c) get a certain amount of flow media and clamp-on rock core from core holding unit backward end and carry out displacement, the flow velocity of flow media is lower than critical flow velocity;
(d) until flow and pressure reduction are stable, be no less than 50～70min stabilization time;
(e) flow media of water injection well should enter rock core from core holding unit forward end entrance;
(f) collect by the flow media volume of rock core, by the initial content of flow media relatively with by the volume of rock core, thereby draw the permeability of rock core matrix.
2. the assay method of rock core matrix permeability according to claim 1, is characterized in that, in described step (a), and flow media selection standard salt solution or kerosene.
3. the assay method of rock core matrix permeability according to claim 1, is characterized in that, the detailed process of described step (b) is: rock core is toasted after 1～2h under the high temperature of 300～400 ℃ to vacuum outgas 1～3h; Then use normal saline solution or kerosene saturated core after degassed, rear for subsequent use.
4. the assay method of rock core matrix permeability according to claim 3, is characterized in that, the baking temperature of described rock core is 350 ℃.
5. the assay method of rock core matrix permeability according to claim 3, is characterized in that, the baking time of described rock core is 1.5h.
6. the assay method of rock core matrix permeability according to claim 3, is characterized in that, vacuum outgas 2h.
7. the assay method of rock core matrix permeability according to claim 1, is characterized in that, in described step (d), is no less than 60min stabilization time.
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| CN201210483454.XA CN103808641A (en) | 2012-11-13 | 2012-11-13 | Determination method for permeability of core matrix |
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| CN201210483454.XA CN103808641A (en) | 2012-11-13 | 2012-11-13 | Determination method for permeability of core matrix |
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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 |
| CN112834405A (en) * | 2021-01-07 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Method and device for testing permeability of rock core overburden pressure matrix |
| CN114577833A (en) * | 2022-05-05 | 2022-06-03 | 克拉玛依禾鑫石油科技有限公司 | Method for rapidly and quantitatively analyzing clay minerals in glutenite detritus matrix and application |
| CN115452682A (en) * | 2022-11-12 | 2022-12-09 | 北京科技大学 | Method and device for measuring absolute permeability of unconventional reservoir ultra-low permeability core liquid |
-
2012
- 2012-11-13 CN CN201210483454.XA patent/CN103808641A/en active Pending
Cited By (6)
| 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 |
| CN112834405A (en) * | 2021-01-07 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Method and device for testing permeability of rock core overburden pressure matrix |
| CN114577833A (en) * | 2022-05-05 | 2022-06-03 | 克拉玛依禾鑫石油科技有限公司 | Method for rapidly and quantitatively analyzing clay minerals in glutenite detritus matrix and application |
| CN114577833B (en) * | 2022-05-05 | 2022-07-29 | 克拉玛依禾鑫石油科技有限公司 | Method for rapidly and quantitatively analyzing clay minerals in glutenite detritus matrix and application |
| CN115452682A (en) * | 2022-11-12 | 2022-12-09 | 北京科技大学 | Method and device for measuring absolute permeability of unconventional reservoir ultra-low permeability core liquid |
| CN115452682B (en) * | 2022-11-12 | 2023-02-03 | 北京科技大学 | Method for measuring absolute permeability of liquid in ultra-low permeability core of unconventional reservoir |
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Application publication date: 20140521 |