CN103808640A - Measuring method of core permeability after damaging - Google Patents
Measuring method of core permeability after damaging Download PDFInfo
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- CN103808640A CN103808640A CN201210483227.7A CN201210483227A CN103808640A CN 103808640 A CN103808640 A CN 103808640A CN 201210483227 A CN201210483227 A CN 201210483227A CN 103808640 A CN103808640 A CN 103808640A
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Abstract
The invention discloses a measuring method of core permeability after damaging. The measuring method of the core permeability after damaging comprises the steps of (a) firstly preparing a flowing medium for later use; (b) then preparing a core to be tested for later use; (c) measuring a core permeability K1 before damaging; (d) damaging the core; (e) measuring a permeability K2 of a flowing medium after the core is damaged by fracturing fluid filter liquor according to the measuring method of the core permeability before damaging. The measuring method of the core permeability after damaging is capable of quickly testing the permeability of the core after the core is damaged, and is accurate in testing result, simple in testing steps, convenient to operate and capable of greatly reducing the testing cost.
Description
Technical field
The present invention relates to the assay method of permeability after a kind of rock core damage.
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, the assay method of permeability after a kind of rock core damage is provided, the method can test out the permeability after rock core damage fast, and test result is accurate, testing procedure is simple, and convenient operation greatly reduces testing cost.
Object of the present invention is achieved through the following technical solutions: the assay method of permeability after a kind of rock core damage, comprises the following steps:
(a) first, prepare flow media for subsequent use;
(b) then, prepare rock core to be tested for subsequent use;
(c) mensuration of core permeability K1 before infringement;
(d) rock core is carried out to course of damage;
(e) measure rock core and be subject to the permeability K2 of the flow media after fracturing liquid filtrate infringement by core permeability assay method before infringement.
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 detailed process of described step (c) is: make flow media 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; Until flow and pressure reduction are stable, be no less than 60min stabilization time.The flow media of water injection well should enter rock core from core holding unit forward end entrance.
The detailed process of described step (d) is: by fracturing liquid filtrate dress people high pressure vessel, with pressure source pressurization, make filtrate enter rock core from core holding unit forward end entrance.In the time that filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate is accurate to 0.1mL; In mensuration process, minute is 36min, and temperature allows fluctuation for ± 5 ℃.After having squeezed, close clamper two ends valve, make filtrate in rock core, stop 2h, experimental temperature is 60 ℃.
In sum, the invention has the beneficial effects as follows: can test out fast the permeability after rock core damage, and test result is accurate, testing procedure is simple, and convenient operation greatly reduces testing cost.
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 permeability after a kind of rock core damage 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) mensuration of core permeability K1 before infringement;
(d) rock core is carried out to course of damage;
(e) measure rock core and be subject to the permeability K2 of the flow media after fracturing liquid filtrate infringement by core permeability assay method before infringement.
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 detailed process of described step (c) is: make flow media 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; Until flow and pressure reduction are stable, be no less than 60min stabilization time.The flow media of water injection well should enter rock core from core holding unit forward end entrance.
The detailed process of described step (d) is: by fracturing liquid filtrate dress people high pressure vessel, with pressure source pressurization, make filtrate enter rock core from core holding unit forward end entrance.In the time that filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate is accurate to 0.1mL; In mensuration process, minute is 36min, and temperature allows fluctuation for ± 5 ℃.After having squeezed, close clamper two ends valve, make filtrate in rock core, stop 2h, experimental temperature is 60 ℃.
The result being recorded by said method is as shown in the table:
As seen from the above table, no matter water drive or oil drives the requirement that core permeability loss ratio is all less than industry standard 30%, but the permeability damage rate of water drive rock core is slightly less than oil and drives, mainly because fracturing liquid filtrate is water external emulsion, water has diluting effect to emulsion fluid foreign minister, thereby accelerated the phase separation of emulsion fluid, therefore the permeability damage rate of rock core is less.
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 (5)
1. the assay method of permeability after rock core damage, 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) mensuration of core permeability K1 before infringement;
(d) rock core is carried out to course of damage;
(e) measure rock core and be subject to the permeability K2 of the flow media after fracturing liquid filtrate infringement by core permeability assay method before infringement.
2. the assay method of permeability after rock core damage 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 permeability after rock core damage 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 permeability after rock core damage according to claim 1, it is characterized in that, the detailed process of described step (c) is: make flow media 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; Until flow and pressure reduction are stable, be no less than 60min stabilization time.The flow media of water injection well should enter rock core from core holding unit forward end entrance.
5. the assay method of permeability after rock core damage according to claim 1, it is characterized in that, the detailed process of described step (d) is: by fracturing liquid filtrate dress people high pressure vessel, with pressure source pressurization, make filtrate enter rock core from core holding unit forward end entrance.In the time that filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate is accurate to 0.1mL; In mensuration process, minute is 36min, and temperature allows fluctuation for ± 5 ℃.After having squeezed, close clamper two ends valve, make filtrate in rock core, stop 2h, experimental temperature is 60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210483227.7A CN103808640A (en) | 2012-11-13 | 2012-11-13 | Measuring method of core permeability after damaging |
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| CN201210483227.7A CN103808640A (en) | 2012-11-13 | 2012-11-13 | Measuring method of core permeability after damaging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792683A (en) * | 2015-04-20 | 2015-07-22 | 中国海洋石油总公司 | Device and method for evaluating damage degree of working solution to tight reservoir |
| CN105973786A (en) * | 2016-07-14 | 2016-09-28 | 西南石油大学 | Shale base block dynamic damage evaluation device and method based on liquid pressure pulse |
| CN106525881A (en) * | 2016-09-14 | 2017-03-22 | 中国石油天然气股份有限公司 | Reservoir damage degree determination method and device |
| CN110132678A (en) * | 2019-06-03 | 2019-08-16 | 西南石油大学 | Oxygen-sensitive oil and gas reservoir rock core flowing experiment sample pretreating method |
-
2012
- 2012-11-13 CN CN201210483227.7A patent/CN103808640A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792683A (en) * | 2015-04-20 | 2015-07-22 | 中国海洋石油总公司 | Device and method for evaluating damage degree of working solution to tight reservoir |
| CN105973786A (en) * | 2016-07-14 | 2016-09-28 | 西南石油大学 | Shale base block dynamic damage evaluation device and method based on liquid pressure pulse |
| CN106525881A (en) * | 2016-09-14 | 2017-03-22 | 中国石油天然气股份有限公司 | Reservoir damage degree determination method and device |
| CN106525881B (en) * | 2016-09-14 | 2022-02-01 | 中国石油天然气股份有限公司 | Method and equipment for measuring damage degree of reservoir |
| CN110132678A (en) * | 2019-06-03 | 2019-08-16 | 西南石油大学 | Oxygen-sensitive oil and gas reservoir rock core flowing experiment sample pretreating method |
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Application publication date: 20140521 |