CN109085109A - A method of evaluation slippery water infiltrating time is to shale permeability impact effect - Google Patents
A method of evaluation slippery water infiltrating time is to shale permeability impact effect Download PDFInfo
- Publication number
- CN109085109A CN109085109A CN201811076061.0A CN201811076061A CN109085109A CN 109085109 A CN109085109 A CN 109085109A CN 201811076061 A CN201811076061 A CN 201811076061A CN 109085109 A CN109085109 A CN 109085109A
- Authority
- CN
- China
- Prior art keywords
- slippery water
- permeability
- rock core
- shale
- impact effect
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
Abstract
The invention discloses a kind of evaluation slippery water infiltrating times to the method for shale permeability impact effect, belongs to shale gas development technique field, mainly comprises the steps that step 1: preparing rock core, is cooled to room temperature after drying；Step 2: rock core vacuumize 48 hours, is then saturated slippery water 1 day, then carry out nuclear magnetic resonance test, obtains the initial T of rock core2Graphs；Step 3: by rock core infiltration different time in slippery water, carry out nuclear magnetic resonance test respectively, obtain the T of different infiltrating times2Graphs；Step 4: nuclear-magnetism permeability is calculated, compares slippery water difference infiltrating time to the impact effect and rule of core permeability.The present invention uses the test method of nuclear magnetic resonance, it is ensured that slippery water fracturing fluid really can comprehensively reflect the influence that shale generates, and data processed result precision is higher.
Description
Technical field
The invention belongs to shale gas development technique fields, and in particular to a kind of evaluation slippery water infiltrating time permeates shale
The method of rate impact effect.
Background technique
Slippery water is a kind of fracturing fluid system that hydraulic fracturing is carried out to shale oil and gas reservoir, is the pass of shale gas exploitation
One of key liquid.Relative to traditional gel fracture liquid system, feature of the slippery water fracturing fluid system with it efficiently, inexpensive exists
It is widely applied in shale gas exploitation.Slippery water is largely trapped in reservoir as a kind of fracturing fluid, will necessarily produce to shale permeability
Raw great influence.
Conventional core injures test evaluation method mainly for conventional reservoir, and has original as the shale of unconventional reservoir
The feature that beginning water saturation is low, porosity is low and permeability is extremely low.If being had using conventional core injury test evaluation method
The shortcomings that following several respects:
(1) the phenomenon that rich gas shale gas reservoir is widely present Abnormal low water saturation, the constraint that laboratory experiment is simulated
Water saturation is much larger than the original water saturation of shale reservoir.That is slippery water fracturing fluid is evaluated using conventional method
The comparison basis of shale damage evaluation is not present, conventional method cannot be used for evaluation fracturing fluid to the extent of injury of reservoir.
(2) conceptual confusion leads to the inconsistent of understanding.The key foundation condition of conventional method is indoor obtained beam
The water saturation tied up under water saturation and stratum reset condition is substantially coincident.Shale is as a kind of unconventional reservoir, room
The irreducible water saturation of interior acquisition is much larger than the water saturation under the initial condition of stratum.In this way, having led to conventional method not
Suitable for evaluating evaluation of the slippery water fracturing fluid to shale permeability.Some scholars are driven with regard to directly mistake with slippery water fracturing fluid
Gas phase permeability after replacing is compared with the absolute permeability of dry rock core, is as a result clearly mistake.
(3) rock core physical property is poor, and the error generated in conventional method measurement is larger, or even measurement error occurs greater than true value
The case where, it is not able to satisfy the required precision to experimental evaluation completely.The shale porosity in the main shale gas producing region in the world mainly divides
For cloth 0.5%~5% between, permeability is both less than 0.1 × 10-3μm2, far below the parameter value of conventional reservoir.Permeability it is true
Real value is very small, has any variation all to may cause biggish test error in test condition, while flowing during displacement test
The precision of meter amount is far from satisfying requirement of experiment.
Therefore, establishing a set of effective evaluation slippery water fracturing fluid has the method for shale permeability impact effect
Highly important theory significance and practical value.
Summary of the invention
Object of the present invention is to: a kind of evaluation slippery water infiltrating time is intended to provide to the side of shale permeability impact effect
Method, to solve the problems, such as background technique.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A method of evaluation slippery water infiltrating time mainly comprises the steps that shale permeability impact effect
Step 1: it chooses representational rock core and prepares rock core, dry cool down again after treatment.
The step 1 is specifically divided into:
1) it according to research needs, chooses representational rock core and prepares rock core；
2) by rock core, drying to constant weight under the conditions of 60 DEG C again, is put into vacuum desiccator and is cooled to room temperature.
Step 2: rock core vacuumize 48 hours, is then saturated slippery water 1 day, then carry out nuclear magnetic resonance test, obtains
To the initial T of rock core2Graphs.
Step 3: by rock core infiltration different time in slippery water, carry out nuclear magnetic resonance test respectively, obtain different infiltrations
The T of time2Graphs.
Step 4: calculating nuclear-magnetism permeability, compare slippery water difference infiltrating time to the impact effect of core permeability and
Rule.
The step 4 is specifically, according to shale penetration rate model: kNMR=8 × 10-8exp(8.1734T2g), k in formulaNMR
For nuclear-magnetism permeability, T2gFor relaxation time T2Geometrical mean, use T2Value calculates the rock core under the conditions of different infiltrating times
Nuclear-magnetism permeability compares slippery water infiltrating time to the impact effect and rule of core permeability.
Compared with prior art, the present invention mainly having the advantage that
1, the method for nuclear magnetic resonance is to obtain the permeability of rock core indirectly according to the fluid preservation situation monitored, is eliminated
The difficulty for manufacturing the ultralow original water saturation of rock core, also avoids being compared using phase permeability and absolute permeability general
Thought is obscured.
2, using the test method of nuclear magnetic resonance, the complicated possible other influences of laboratory operating procedures are eliminated, really
Protecting slippery water fracturing fluid really can comprehensively reflect the influence that shale generates, and data processed result precision is high.
3, this method can test the shale permeability under the conditions of different slippery water infiltrating times, to study slippery water pressure break
Liquid difference infiltrating time provides a kind of new experimental method to the impact effect and rule of shale percolation ability.
Detailed description of the invention
The present invention can be further illustrated by the nonlimiting examples that attached drawing provides；
Fig. 1 is in the present invention by the T of rock core infiltration different time in slippery water2The graphs in relaxation time；
Fig. 2 is T2 relaxation time corresponding graphs between 0.2ms~2ms in Fig. 1；
Fig. 3 is T2 relaxation time corresponding graphs between 4ms~4000ms in Fig. 1；
Fig. 4 is in the present invention by the histogram of rock core infiltration permeability of different time in slippery water.
Specific embodiment
In order to make those skilled in the art that the present invention may be better understood, with reference to the accompanying drawings and examples to this hair
Bright technical solution further illustrates.
A kind of evaluation slippery water infiltrating time of the invention mainly includes following to the method for shale permeability impact effect
Step:
Step 1 chooses Chongqing northeast a bite shale gas well Longma small stream group shale core and prepares rock core, so according to research needs
By rock core, drying to constant weight under the conditions of 60 DEG C afterwards, is put into vacuum desiccator and is cooled to room temperature.
Step 2,
1) rock core is put into vacuum evacuation device first, vacuumizes 48 hours, is then saturated slippery water 1 day.
2) nuclear magnetic resonance test is carried out, test parameter is set: when echo sounding time 0.1ms, echo number 1024, waiting
Between 2000ms, scanning times 64, obtain the initial T of rock core2Relaxation time and its corresponding amplitude, as initial value.
Step 3: by rock core infiltration 5 days, 10 days, 15 days, 20 days, 25 days, 30 days, 35 days, 45 days and 60 in slippery water
Its totally 9 different time carries out nuclear magnetic resonance test respectively, test parameter: echo sounding time 0.1ms, echo number is arranged
1024, waiting time 2000ms, scanning times 64, obtain the T of different infiltrating times2Relaxation time and its corresponding amplitude.
The equipment that above-mentioned carry out nuclear magnetic resonance test uses is market products.
The T that step 2 and step 3 are obtained2Relaxation time and its corresponding amplitude summarize, such as table 1:
Table 1
According to table 1 and formula
T can be obtained2iValue, such as table 2:
Table 2
Wherein, i represents T2Each point on graphs, T2iAnd niRespectively represent the T at each point2Relaxation time and its phase
Amplitude is answered, m is the T of test2Points, T2gFor relaxation time T2Geometrical mean.Different infiltrating times can be obtained according to table 2
The T2 relaxation time graphs, as shown in Fig. 1 to Fig. 3.
Step 4: finally according to shale penetration rate model:
kNMR=8 × 10-8exp(8.1734T2g) (1-2)
K in above formulaNMRFor nuclear-magnetism permeability, T2gFor relaxation time T2Geometrical mean, formula (1-2) is by paper " river
The research of Nan Longmaxi group shale nuclear-magnetism permeability new model " it is open, details are not described herein again for derivation process, is calculated using T2 value
To the nuclear-magnetism permeability of rock core, T is arrived according to what formula (1-1) was calculated2gSuch as table 3:
Table 3
The histogram of the permeability of the rock core of different infiltrating times can be obtained according to table 3, as shown in Figure 4.
It is impact effect and rule of the comparable slippery water infiltrating time to core permeability according to Fig. 4.
Above to a kind of evaluation slippery water infiltrating time provided by the invention to the method for shale permeability impact effect into
It has gone and has been discussed in detail.The explanation of specific embodiment is merely used to help understand method and its core concept of the invention.It should refer to
It out, for those skilled in the art, without departing from the principle of the present invention, can also be to the present invention
Some improvement and modification can also be carried out, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (3)
1. a kind of evaluation slippery water infiltrating time is to the method for shale permeability impact effect, it is characterised in that: mainly include with
Lower step,
Step 1: preparing rock core, is cooled to room temperature after drying；
Step 2: rock core vacuumize 48 hours, is then saturated slippery water 1 day, then carry out nuclear magnetic resonance test, obtains rock
The initial T of the heart2Graphs；
Step 3: by rock core infiltration different time in slippery water, carry out nuclear magnetic resonance test respectively, obtain different infiltrating times
T2Graphs；
Step 4: nuclear-magnetism permeability is calculated, compares slippery water difference infiltrating time to the impact effect and rule of core permeability.
2. a kind of evaluation slippery water infiltrating time according to claim 1 is to the method for shale permeability impact effect,
Be characterized in that: the step 1 is specifically divided into
1) according to research needs, representational rock core is chosen, rock core is prepared；
2) by rock core, drying to constant weight under the conditions of 60 DEG C again, is put into vacuum desiccator and is cooled to room temperature.
3. a kind of evaluation slippery water infiltrating time according to claim 1 is to the method for shale permeability impact effect,
Be characterized in that: the step 4 is specifically, according to shale penetration rate model: kNMR=8 × 10-8exp(8.1734T2g), in formula
kNMRFor nuclear-magnetism permeability, T2gFor relaxation time T2Geometrical mean, use T2Value calculates the rock under the conditions of different infiltrating times
Heart nuclear-magnetism permeability compares slippery water infiltrating time to the impact effect and rule of core permeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811076061.0A CN109085109A (en) | 2018-09-14 | 2018-09-14 | A method of evaluation slippery water infiltrating time is to shale permeability impact effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811076061.0A CN109085109A (en) | 2018-09-14 | 2018-09-14 | A method of evaluation slippery water infiltrating time is to shale permeability impact effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109085109A true CN109085109A (en) | 2018-12-25 |
Family
ID=64841528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811076061.0A Pending CN109085109A (en) | 2018-09-14 | 2018-09-14 | A method of evaluation slippery water infiltrating time is to shale permeability impact effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109085109A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562199A (en) * | 2019-02-13 | 2020-08-21 | 中国石油天然气股份有限公司 | Method and system for determining energy storage and replacement performance of compact oil |
| CN114076729A (en) * | 2020-08-12 | 2022-02-22 | 中国石油天然气股份有限公司 | Quantitative research method for salt dissolution of salt-containing shale oil reservoir |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990851A (en) * | 2015-06-23 | 2015-10-21 | 西南石油大学 | Novel experimental research method for shale sensitivity |
| CN107329182A (en) * | 2017-07-26 | 2017-11-07 | 中国石油天然气股份有限公司 | A kind of method and device for determining reservoir permeability |
| CN107843937A (en) * | 2016-09-20 | 2018-03-27 | 中国石油化工股份有限公司 | The nuclear magnetic resonance characterizing method of the effective percolation ability of low permeability sandstone reservoirs |
-
2018
- 2018-09-14 CN CN201811076061.0A patent/CN109085109A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990851A (en) * | 2015-06-23 | 2015-10-21 | 西南石油大学 | Novel experimental research method for shale sensitivity |
| CN107843937A (en) * | 2016-09-20 | 2018-03-27 | 中国石油化工股份有限公司 | The nuclear magnetic resonance characterizing method of the effective percolation ability of low permeability sandstone reservoirs |
| CN107329182A (en) * | 2017-07-26 | 2017-11-07 | 中国石油天然气股份有限公司 | A kind of method and device for determining reservoir permeability |
Non-Patent Citations (2)
| Title |
|---|
| BIN YUAN ET AL.: "Effect of slick water on permeability of shale gas reservoirs", 《JOURNAL OF ENERGY RESOURCES TECHNOLOGY》 * |
| 周尚文 等: "川南龙马溪组页岩核磁渗透率新模型研究", 《中国石油大学学报（自然科学版）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562199A (en) * | 2019-02-13 | 2020-08-21 | 中国石油天然气股份有限公司 | Method and system for determining energy storage and replacement performance of compact oil |
| CN111562199B (en) * | 2019-02-13 | 2022-12-02 | 中国石油天然气股份有限公司 | Method and system for determining energy storage and replacement performance of compact oil |
| CN114076729A (en) * | 2020-08-12 | 2022-02-22 | 中国石油天然气股份有限公司 | Quantitative research method for salt dissolution of salt-containing shale oil reservoir |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Elwegaa et al. | Improving oil recovery from shale oil reservoirs using cyclic cold carbon dioxide injection–An experimental study | |
| Cao et al. | Characteristics and origin of abnormally high porosity zones in buried Paleogene clastic reservoirs in the Shengtuo area, Dongying Sag, East China | |
| CN106153518A (en) | Compact sandstone gas reservoir fracturing liquid damage experimental evaluation method | |
| CN109085109A (en) | A method of evaluation slippery water infiltrating time is to shale permeability impact effect | |
| CN105464654A (en) | Method and device for determining saturation exponent of tight sandstone | |
| CN109522634A (en) | A kind of tight gas multistage volume fracturing horizontal well numerical analysis method | |
| WO2015017190A2 (en) | Dynamic in-situ measurement of reservoir wettability | |
| CN103245595B (en) | Method for evaluating moving prevention ability of cement paste | |
| CN105067794A (en) | Method for testing water sensitivity, salt sensitivity and alkali sensitivity of shale reservoir stratum | |
| Kelley et al. | Reservoir characterization from pressure monitoring during CO2 injection into a depleted pinnacle reef–MRCSP commercial-scale CCS demonstration project | |
| CN109085108A (en) | A method of evaluation slippery water intrusion volume is to shale permeability impact effect | |
| CN113484216B (en) | Method for evaluating water phase flowback rate and reasonable flowback pressure difference of tight sandstone gas reservoir | |
| Ma et al. | Simulation and interpretation of the pressure response for formation testing while drilling | |
| CN109060634A (en) | Based on gas permeability evaluation slippery water to the method for shale permeability impact effect | |
| CN103995297A (en) | Method for correcting resistivity of crack carbonatite stratum | |
| CN108827840A (en) | The field test device and method of rapid accumulation bottom sediment consolidation settlement | |
| Golovin et al. | Injection rate effects on waterflooding mechanisms and injectivity in cohesionless sand | |
| CA1293923C (en) | Matrix treatment process for oil extraction applications | |
| CN109594960A (en) | The visual experimental apparatus and its visualization sandpack column of analog composite foam profile control | |
| CN105067793A (en) | Method for testing acid sensitivity of shale reservoir stratum | |
| CN106958437B (en) | A kind of wellfracturing raising recovery ratio new method | |
| CN116380752B (en) | Evaluation method for shielding effect of degradable sinking agent artificial interlayer | |
| Mangane et al. | Relative permeability experiments monitored by NMR | |
| Chen et al. | In-situ production profiling for recovery optimization via fiber-optic monitoring | |
| CN117147609A (en) | Nuclear magnetic porosity calculation method for oil-based mud invading oil layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181225 |
|
| WD01 | Invention patent application deemed withdrawn after publication |