CN103712899A - Method for determining matrix permeability of rock core - Google Patents
Method for determining matrix permeability of rock core Download PDFInfo
- Publication number
- CN103712899A CN103712899A CN201210408568.8A CN201210408568A CN103712899A CN 103712899 A CN103712899 A CN 103712899A CN 201210408568 A CN201210408568 A CN 201210408568A CN 103712899 A CN103712899 A CN 103712899A
- Authority
- CN
- China
- Prior art keywords
- rock core
- filtrate
- permeability
- core
- assay method
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for determining the matrix permeability of a rock core. The method comprises the following steps: 1, determining the permeability K1 of the rock core before damage; 2, filling a fracturing fluid filtrate into a high pressure container, pressurizing by using a pressure sauce to make the filtrate enter the rock core, from the forward end of a rock core holder; 3, recording the time and the accumulated filter loss of the filtrate when the flow of the filtrate starts; 4, closing valves at two ends of the holder after the extrusion to make the filtrate residual in the rock core; and 5, determining the permeability K2 of the rock core after the damage. The method allows the determination of the matrix permeability rate of the rock core to be well completed, and has the advantages of simple test process, short test time, test cost reduction and accurate test result.
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, is used 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 carry out and creep into by the stratigraphic horizon of geological design and the degree of depth, 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 studying, 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 oil, the water saturation having 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 the fluid saturation under condition of formation pressure again.But this method complex process, cost is high.
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, this assay method can well complete the mensuration to rock core matrix permeability, and test process is simple, test duration is short, has reduced testing cost, and test result is accurate.
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, the mensuration of core permeability K1 before infringement;
(b) 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;
(c) when filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate;
(d) after having squeezed, close clamper two ends valve, filtrate is stopped in rock core;
(e) mensuration of core permeability K2 after infringement.
In described step (c), the accumulative total filter loss of time, filtrate is accurate to 0.1mL.
In described step (d), the residence time is 2h, and experimental temperature is 60 ℃.
The detailed process of described step (a) 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 (e) is: by core permeability assay method before infringement, measure the permeability K2 that rock core is subject to the flow media after the infringement of fracturing liquid filtrate.
In sum, the invention has the beneficial effects as follows: can well complete the mensuration to rock core matrix permeability, and test process is simple, the test duration is short, has reduced testing cost, and test result is accurate.
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, comprises the following steps:
(a) first, the mensuration of core permeability K1 before infringement;
(b) 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;
(c) when filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate;
(d) after having squeezed, close clamper two ends valve, filtrate is stopped in rock core;
(e) mensuration of core permeability K2 after infringement.
In described step (c), the accumulative total filter loss of time, filtrate is accurate to 0.1mL.
In described step (d), the residence time is 2h, and experimental temperature is 60 ℃.
The detailed process of described step (a) 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 (e) is: by core permeability assay method before infringement, measure the permeability K2 that rock core is subject to the flow media after the infringement of fracturing liquid filtrate.
The result recording by said method is as shown in the table:
As seen from the above table, water drive or oil drives the requirement that core permeability loss ratio is all less than industry standard 30% no matter, 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, so 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. an assay method for rock core matrix permeability, is characterized in that, comprises the following steps:
(a) first, the mensuration of core permeability K1 before infringement;
(b) 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;
(c) when filtrate beginning is flowed out, the accumulative total filter loss of writing time, filtrate;
(d) after having squeezed, close clamper two ends valve, filtrate is stopped in rock core;
(e) mensuration of core permeability K2 after infringement.
2. the assay method of a kind of rock core matrix permeability according to claim 1, is characterized in that, in described step (c), the accumulative total filter loss of time, filtrate is accurate to 0.1mL.
3. the assay method of a kind of rock core matrix permeability according to claim 1, is characterized in that, in described step (d), the residence time is 2h, and experimental temperature is 60 ℃.
4. the assay method of a kind of rock core matrix permeability according to claim 1, it is characterized in that, the detailed process of described step (a) 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 a kind of rock core matrix permeability according to claim 1, it is characterized in that, the detailed process of described step (e) is: by core permeability assay method before infringement, measure the permeability K2 that rock core is subject to the flow media after the infringement of fracturing liquid filtrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210408568.8A CN103712899A (en) | 2012-10-09 | 2012-10-09 | Method for determining matrix permeability of rock core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210408568.8A CN103712899A (en) | 2012-10-09 | 2012-10-09 | Method for determining matrix permeability of rock core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103712899A true CN103712899A (en) | 2014-04-09 |
Family
ID=50406048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210408568.8A Pending CN103712899A (en) | 2012-10-09 | 2012-10-09 | Method for determining matrix permeability of rock core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103712899A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US11579065B2 (en) | 2019-06-06 | 2023-02-14 | Saudi Arabian Oil Company | Methods and systems for determining fracture and matrix permeability of a subsurface formation |
-
2012
- 2012-10-09 CN CN201210408568.8A patent/CN103712899A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11579065B2 (en) | 2019-06-06 | 2023-02-14 | Saudi Arabian Oil Company | Methods and systems for determining fracture and matrix permeability of a subsurface formation |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| He et al. | Waterflood direction and front characterization with four-step work flow: a case study in changqing oil field China | |
| US9091781B2 (en) | Method for estimating formation permeability using time lapse measurements | |
| AU2008327958B2 (en) | In-situ fluid compatibility testing using a wireline formation tester | |
| CN106285646B (en) | Drilling well loss horizon recognition methods based on multi-information fusion | |
| CN104379870A (en) | Method for determining a permeability or mobility of a radial flow response of a reservoir | |
| CN106522928B (en) | Well testing method for unstable pressure drop of well logging head by stopping pump after acidizing and fracturing | |
| CN103821505B (en) | Sandstone petroleum conduction layer geophysics-geology-geochemical detection method and device | |
| CN103713107A (en) | Method for determining matrix damage rate of rock core | |
| Kumar et al. | Diagnosing fracture-wellbore connectivity using chemical tracer flowback data | |
| CN105842751B (en) | Shale reservoir fracture evaluation method | |
| US11624277B2 (en) | Determining fracture driven interactions between wellbores | |
| CN103808640A (en) | Measuring method of core permeability after damaging | |
| CN103808641A (en) | Determination method for permeability of core matrix | |
| Ren et al. | Monitoring on CO2 EOR and storage in a CCS demonstration project of Jilin Oilfield China | |
| Kurtoglu et al. | Minidrillstem tests to characterize formation deliverability in the Bakken | |
| CN103712899A (en) | Method for determining matrix permeability of rock core | |
| Azari et al. | Well-testing challenges in unconventional and tight-gas-formation reservoirs | |
| Temizel et al. | A review of hydraulic fracturing and latest developments in unconventional reservoirs | |
| Mullins et al. | Diverse Fluid Gradients Associated with Biodegradation of Crude Oil | |
| CN103808546B (en) | Rock core find time pressurize saturation system | |
| US20230349286A1 (en) | Geologic formation characterization | |
| Novikov et al. | Tight gas Achimov formation evaluation and sampling with wireline logging tools: Advanced approaches and technologies | |
| Quint et al. | From liability to cost effective data gathering opportunity | |
| Stephens et al. | Reservoir characterisation of the Patchawarra Formation within a deep, basin-margin gas accumulation | |
| Rodrigo et al. | Geomechanical and Hydraulic Stimulation Integrated to Evaluate a Deviation in Productivity. A Case Study |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140409 |