CN109470617A - A kind of quick experimental evaluation method of Fractured compact sandstone gas layer fluid speed - Google Patents
A kind of quick experimental evaluation method of Fractured compact sandstone gas layer fluid speed Download PDFInfo
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- CN109470617A CN109470617A CN201811325215.5A CN201811325215A CN109470617A CN 109470617 A CN109470617 A CN 109470617A CN 201811325215 A CN201811325215 A CN 201811325215A CN 109470617 A CN109470617 A CN 109470617A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 21
- 239000012530 fluid Substances 0.000 title claims description 16
- 239000011435 rock Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 230000035699 permeability Effects 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000002734 clay mineral Substances 0.000 claims abstract description 3
- 238000005213 imbibition Methods 0.000 claims description 5
- 230000002269 spontaneous effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 19
- 238000011161 development Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 230000001550 time effect Effects 0.000 abstract description 3
- 230000007812 deficiency Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 9
- 206010017076 Fracture Diseases 0.000 description 9
- 239000004576 sand Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 239000008398 formation water Substances 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention relates to oil and gas reservoir core analysis fields, this method is using gas as tested media, it cannot reflect the deficiency of the true quick state of speed of gas reservoir when considering in traditional evaluation method using liquid displacement, influence of the presence in crack to permeability test bring time effect is eliminated simultaneously, the reliability that ensure that experimental result is a kind of experimental method belonged in oil and gas exploration and development process in terms of core analysis.The experiment avoids water flooding and clay mineral extra in rock core and water-sensitive occurs or Water trapping is caused to damage.Outlet end applies back pressure, not only simulates shaft bottom production stream pressure condition, slippage effect when also simulating reservoir pore pressure condition, while reducing gas displacement crack rock core, and realization accurately objectively evaluates.
Description
Technical field
The present invention relates to oil and gas reservoir core analysis field, this method, as tested media, is examined using gas
It cannot reflect the deficiency of the true quick state of speed of gas reservoir when having considered in traditional evaluation method using liquid displacement, while eliminate crack
Presence to permeability test bring time effect influence, ensure that the reliability of experimental result, be that one kind belongs to petroleum
Experimental method during natural gas exploration and development in terms of core analysis.
Background technique
Fractured compact sandstone gas plant distribution on global range is wide, reserves are huge, shows good potentiality to be exploited.With it is normal
Rule reservoir is compared, and pore throat is tiny, low porosity and low permeability, reservoir intrinsic fracture development etc. is that Fractured DAMAGE OF TIGHT SAND GAS RESERVOIRS is the most significant
Physical property characteristic.Gas output needs to undergo from fine and close matrix to intrinsic fracture, then more rulers of pit shaft are finally flow to from intrinsic fracture
Spend journey.In this process, considerable role is played the part of in crack wherein.On the one hand the presence in crack to develop fine and close sand
Rock gas reservoir is possibly realized；On the other hand, reservoir stress sensitive and fast quick equal potential damages are also brought in crack.
Currently, still carry out the quick experiment of reservoir speed to DAMAGE OF TIGHT SAND GAS RESERVOIRS using traditional fast sensitivity experimental method in industry to comment
Valence.However, the quick evaluation of traditional speed uses liquid as tested media, this is not inconsistent with DAMAGE OF TIGHT SAND GAS RESERVOIRS actual production operating condition.
Gas differs huge with fluid density, flow behavior of the two in reservoir and exists very on the action characteristic of reservoir particle
Big difference.Liquid can weaken rock strength with rock contact for a long time, cause the particle of crack wall surface to be easy to happen and fall off, and
The damage for bringing water-sensitive etc. new.DAMAGE OF TIGHT SAND GAS RESERVOIRS generation speed is quick generally under some water saturation, and conventional method then uses
Saturated core carries out displacement.In addition, conventional method when carrying out the rock core quick experiment of speed, does not fully consider crack (containing crack) rock
The time effect that the heart occurs during the test, leading to permeability (or flow), also not up to stabilization begins to measure.Therefore, it uses
The real conditions of liquid makees test medium when cannot reflect gas reservoir development reservoir, constrain the accuracy of experimental result, to production
The designs such as pressure difference bring adverse effect.
As it can be seen that being no longer able to meet the quick degree of fracture DAMAGE OF TIGHT SAND GAS RESERVOIRS reservoir speed using the quick method of tradition speed
Evaluation, form a kind of experimental method fracture for capableing of the quick degree of accurate evaluation Fractured DAMAGE OF TIGHT SAND GAS RESERVOIRS reservoir speed and cause
Close sandstone reservoirs reservoir protection and Efficient Development are significant.
Summary of the invention
In order to solve the limitation that the conventional quick damage appraisement method fracture tight gas reservoir of speed is evaluated, in conjunction with cause
Seepage environment under close gas reservoir water saturation state and practical production status, objectively evaluates the invention proposes a kind of interior and splits
The quick damage experimental method of speed of seam property Methed of Tight Sandstone Gas Layers.
Experiment purpose of the invention is achieved through the following technical solutions:
The present invention mainly realizes the quick evaluation of fracture tight sand tight gas reservoir speed by following key technology, and first is
Pretreatment to experiment rock core establishes corresponding water saturation by Spontaneous capillary imbibition method according to reservoir formation water data.Second is
Gas permeability evaluation is carried out to the crack rock core for establishing water saturation, and according to the quick damage of permeability damage rate expansion speed
Degree evaluation.
The quick damage experimental evaluation method of Fractured tight gas reservoir speed, this method are complete using laboratory core displacement test device
Include core holding unit, confining pressure pump, gas source, soap bubble flowmeter, back-pressure valve composition at, the rock core displacement device, this method according to
It is secondary the following steps are included:
Step 1, according to SYT5358-2010 rock core preparation method, cutting diameter 2.5cm or so, the rock core of length 4-7cm,
60 DEG C drying to constant weight, measures length, the diameter, porosity and permeability of rock core；Check device air-tightness, monitoring time are many
In 48h.
Step 2 prepares simulated formation aqueous solution, uses Spontaneous capillary imbibition method to establish according to well-log information corresponding containing water saturation
Degree is tested after establishing the rock core standing 48h of water saturation.
Step 3 carries out artificial seam to the rock core for establishing water saturation.
The rock core pre-processed is put into core holding unit by step 4, increases confining pressure, stands 4h, and it is quick to eliminate stress
Sense.
Step 5, confining pressure keep stablizing, and with different gas velocity displacement rock cores, record corresponding permeability (ki).
The rock core for establishing water saturation is put into clamper 4 by step 6, is enclosed by the certain experiment of 5 load of confining pressure pump
Pressure opens gas source 1, after certain experiment back pressure is established by back-pressure valve 6, using nitrogen forward direction displacement.Monitor soap bubble flowmeter 7
Flow, and its permeability is calculated by Darcy formula.
And according to the quick fast damage appraisement of speed that permeability damage rate carries out different water cut saturation degree tight gas reservoir, calculation formula
It is as follows:
The present invention has the advantage that compared with conventional method
First is that the quick damage appraisement experiment of the speed that different water cut saturation degree Fractured tight gas reservoir can be carried out.Conventional method is surveyed
When trying the compact rock core quick damage of speed, by displacement water flooding, keep rock core fully saturated by fluid, it cannot be to different water cut saturation degree
Rock core carry out the quick damage appraisement of speed, and the experiment avoid water flooding and clay mineral extra in rock core occur water-sensitive or
Water trapping is caused to damage.Outlet end applies back pressure, not only simulates shaft bottom production stream pressure condition, also simulates reservoir pore space pressure
Power condition, while slippage effect when reducing gas displacement crack rock core.
Second is that the quick difference quick with Common fluids speed of the tight gas reservoir speed of different water cut saturation degree is to select displacement fluid
On difference.The displacement fluid of the conventional quick selection of fluid speed is mainly water flooding or simulated formation water (normal saline solution), difference
The fluid of water saturation tight gas reservoir is mainly nitrogen, while eliminating the indoor security risk of experiment.
Detailed description of the invention:
Fig. 1 is the quick damage experiment driving device figure of speed of Lab-evaluation tight gas reservoir different water cut saturation degree.
In figure: 1. nitrogen cylinders, 2. pipelines, 3. pressure gauges, 4. core holding units, 5. confining pressures pump, 6. back-pressure valves, 7. soap bubble streams
Meter.
Specific embodiment
The present invention is further illustrated to attached drawing and specific experiment evaluation example below.
It chooses library vehicle the north enlightening North block typical case to appear rock core, carries out the quick damage of speed of fracture tight gas reservoir using the present invention
Evil experimental evaluation.
Step 1, according to SYT5358-2010 rock core preparation method, measure diameter, length.60 DEG C drying to constant weight, passes through
Measuring system is seeped in the full-automatic rock core hole of SCMS-C3 type, measures permeability and porosity, detection device air-tightness 48h, device are airtight
Property reaches requirement.
Step 2 prepares simulated formation aqueous solution, uses Spontaneous capillary imbibition method according to well-log information, establishes corresponding aqueous full
The rock core for establishing water saturation with degree stands 48h and is tested.
Step 3 carries out artificial seam to the rock core for establishing water saturation.
The rock core pre-processed is put into core holding unit by step 4, increases confining pressure, stands 4h, and it is quick to eliminate stress
Sense, and test original permeability (ko).
Step 5, to the rock core for establishing water saturation, carry out the nitrogen displacement test under gas with various rate.Selection
Confining pressure 3MPa, back pressure 1MPa.
The rock core forward direction for establishing water saturation is fitted into clamper 3 by step 6, sets confining pressure as 3MPa, referring to rule
Fixed 0.01MPa/cm, 0.035MPa/cm, 0.06MPa/cm, 0.1MPa/cm, 0.15MPa/cm, 0.2MPa/cm, 0.3MPa/
Cm, 0.35MPa/cm, 0.4MPa/cm, 0.458MPa/cm, 0.5MPa/cm, 0.6MPa/cm, the setting of flow should also be as view rock
Depending on heart concrete condition.
The determination of step 7, critical flow velocity point, if flow velocity vi-1Corresponding permeability ki-1With flow velocity viCorresponding permeability ki
Meet formula 1 explanation have occurred speed it is quick, sensitivity is shown in Table.
The conventional quick evaluation method of fluid speed can not fracture tight gas reservoir make objective and accurate evaluation, the above invention has
The experiment parameters such as the pressure in body implementation can flexibly be changed according to experiment rock core object and actual conditions, but there are two key technologies
Retained: first is that establishing water saturation to rock core using Spontaneous capillary imbibition method according to well-log information；Second is that being replaced often with nitrogen
The quick selection water flooding of fluid speed or simulated formation water of rule.
Claims (2)
1. a kind of the step of Fractured compact sandstone gas layer fluid speed quick experimental evaluation method, is as follows:
(1) matrix rock core is put into after being dried for 24 hours in 60 DEG C of constant temperature of baking oven, takes out rock core and stands 4h, it is cooling to rock core；
(2) benchmark permeability (ko) test is carried out to the rock core after drying；
(3) simulated formation aqueous solution is prepared, corresponding water saturation is established using Spontaneous capillary imbibition method according to well-log information, is established
The rock core of good water saturation is tested after standing 48h；
(4) artificial seam is carried out to the rock core for establishing water saturation；
(6) rock core pre-processed is put into core holding unit, increases confining pressure, stand 4h, eliminate stress sensitive；
(7) confining pressure keeps stablizing, and with different flow displacement rock cores, records corresponding permeability (ki)；
(8) referring to regulation 0.01MPa/cm, 0.035MPa/cm, 0.06MPa/cm, 0.1MPa/cm, 0.15MPa/cm, 0.2MPa/
cm,0.3MPa/cm,0.35MPa/cm,0.4MPa/cm,0.458MPa/cm,0.5MPa/cm,0.6MPa/cm；
(9) determination of critical flow velocity point, if flow velocity vi-1Corresponding permeability ki-1With flow velocity viCorresponding permeability kiMeet formula 1
Illustrate to have occurred that speed is quick, and sensitivity is shown in Table.
2. according to a kind of quick experimental evaluation method principle of the Fractured compact sandstone gas layer fluid speed of claims 1:
The quick evaluation of conventional speed is that rock core is replaced with stratum water drive, and the hole in rock core is saturated by fluid, is assigned with true gas
Dis environment has differences, and after rock core saturation fluid, easily with the clay mineral in rock core water sensitive damage and water phase circle occur for fluid
The damage such as close；Corresponding water saturation is established to rock core according to well-log information, then carries out displacement with gas with various rate, it can
The real conditions for more accurately simulating reservoir keep the evaluation result of formation damage more accurate objective, evaluation result more representative of
Fractured tight gas reservoir downhole production situation.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946436A (en) * | 2019-04-15 | 2019-06-28 | 西南石油大学 | A kind of Fractured tight gas reservoir working solution damage appraisement method for taking into account matrix and crack |
| CN109946437A (en) * | 2019-04-15 | 2019-06-28 | 西南石油大学 | A kind of Fractured compact reservoir working solution damage appraisement method for taking into account matrix and Fracture System |
| CN110361523A (en) * | 2019-08-16 | 2019-10-22 | 西南石油大学 | Oil-gas Layer oxygen-sensitive experimental evaluation method |
| CN110456023A (en) * | 2019-08-13 | 2019-11-15 | 安徽理工大学 | A kind of dynamic monitoring coal seam reservoirs sensibility and mining control simulation experiment method |
| CN110686952A (en) * | 2019-11-05 | 2020-01-14 | 西南石油大学 | Method for quickly establishing pressure storage layer of full-diameter rock core of tight gas reservoir |
| CN110793901A (en) * | 2019-12-13 | 2020-02-14 | 西南石油大学 | High-temperature high-pressure gas reservoir permeability flow rate sensitivity test method considering bound water |
| CN111006989A (en) * | 2019-12-31 | 2020-04-14 | 西南石油大学 | Experimental parameter obtaining method for shale water phase trapping damage evaluation |
| CN111044712A (en) * | 2019-12-31 | 2020-04-21 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN112036097A (en) * | 2020-09-11 | 2020-12-04 | 重庆科技学院 | Capacity calculation method for water-lock gas well |
| CN112362298A (en) * | 2020-10-30 | 2021-02-12 | 上海应用技术大学 | Gas phase flow field simulation device with variable boundary conditions |
| CN113326995A (en) * | 2020-02-28 | 2021-08-31 | 中国石油化工股份有限公司 | Experimental evaluation method for reservoir matrix damage |
| CN113655082A (en) * | 2021-10-15 | 2021-11-16 | 西南石油大学 | Optimization method for evaluating well-entering fluid of tight shale reservoir |
| CN114002123A (en) * | 2021-10-29 | 2022-02-01 | 中国海洋石油集团有限公司 | Loose low-permeability sandstone particle migration experiment method |
| US11598711B2 (en) | 2021-01-07 | 2023-03-07 | Saudi Arabian Oil Company | Method and apparatus for measuring stress dependency of shale permeability with steady-state flow |
| CN116050623A (en) * | 2023-02-01 | 2023-05-02 | 西南石油大学 | Method for calculating and evaluating gas supply capacity of tight gas reservoir |
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| CN109946437A (en) * | 2019-04-15 | 2019-06-28 | 西南石油大学 | A kind of Fractured compact reservoir working solution damage appraisement method for taking into account matrix and Fracture System |
| CN109946436A (en) * | 2019-04-15 | 2019-06-28 | 西南石油大学 | A kind of Fractured tight gas reservoir working solution damage appraisement method for taking into account matrix and crack |
| CN109946437B (en) * | 2019-04-15 | 2021-07-23 | 西南石油大学 | Fractured compact reservoir working fluid damage evaluation method considering both base block and fracture system |
| CN110456023A (en) * | 2019-08-13 | 2019-11-15 | 安徽理工大学 | A kind of dynamic monitoring coal seam reservoirs sensibility and mining control simulation experiment method |
| CN110361523A (en) * | 2019-08-16 | 2019-10-22 | 西南石油大学 | Oil-gas Layer oxygen-sensitive experimental evaluation method |
| CN110686952A (en) * | 2019-11-05 | 2020-01-14 | 西南石油大学 | Method for quickly establishing pressure storage layer of full-diameter rock core of tight gas reservoir |
| CN110793901A (en) * | 2019-12-13 | 2020-02-14 | 西南石油大学 | High-temperature high-pressure gas reservoir permeability flow rate sensitivity test method considering bound water |
| CN110793901B (en) * | 2019-12-13 | 2022-02-11 | 西南石油大学 | High-temperature high-pressure gas reservoir permeability flow rate sensitivity test method considering bound water |
| CN111006989A (en) * | 2019-12-31 | 2020-04-14 | 西南石油大学 | Experimental parameter obtaining method for shale water phase trapping damage evaluation |
| CN111044712A (en) * | 2019-12-31 | 2020-04-21 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN111006989B (en) * | 2019-12-31 | 2022-02-01 | 西南石油大学 | Experimental parameter obtaining method for shale water phase trapping damage evaluation |
| CN111044712B (en) * | 2019-12-31 | 2022-02-08 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN113326995A (en) * | 2020-02-28 | 2021-08-31 | 中国石油化工股份有限公司 | Experimental evaluation method for reservoir matrix damage |
| CN112036097A (en) * | 2020-09-11 | 2020-12-04 | 重庆科技学院 | Capacity calculation method for water-lock gas well |
| CN112036097B (en) * | 2020-09-11 | 2022-05-31 | 重庆科技学院 | Capacity calculation method for water-lock gas well |
| CN112362298A (en) * | 2020-10-30 | 2021-02-12 | 上海应用技术大学 | Gas phase flow field simulation device with variable boundary conditions |
| US11598711B2 (en) | 2021-01-07 | 2023-03-07 | Saudi Arabian Oil Company | Method and apparatus for measuring stress dependency of shale permeability with steady-state flow |
| CN113655082A (en) * | 2021-10-15 | 2021-11-16 | 西南石油大学 | Optimization method for evaluating well-entering fluid of tight shale reservoir |
| CN114002123A (en) * | 2021-10-29 | 2022-02-01 | 中国海洋石油集团有限公司 | Loose low-permeability sandstone particle migration experiment method |
| CN114002123B (en) * | 2021-10-29 | 2024-05-10 | 中国海洋石油集团有限公司 | Loose hypotonic sandstone particle migration experimental method |
| CN116050623A (en) * | 2023-02-01 | 2023-05-02 | 西南石油大学 | Method for calculating and evaluating gas supply capacity of tight gas reservoir |
| CN116050623B (en) * | 2023-02-01 | 2023-05-30 | 西南石油大学 | Method for calculating and evaluating gas supply capacity of tight gas reservoir |
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