CN105651665B - A kind of drilling and completing fluids influence evaluation method to rock core grease permeability - Google Patents
A kind of drilling and completing fluids influence evaluation method to rock core grease permeability Download PDFInfo
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- CN105651665B CN105651665B CN201410668895.6A CN201410668895A CN105651665B CN 105651665 B CN105651665 B CN 105651665B CN 201410668895 A CN201410668895 A CN 201410668895A CN 105651665 B CN105651665 B CN 105651665B
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- 239000004519 grease Substances 0.000 title claims abstract description 53
- 238000011156 evaluation Methods 0.000 title claims abstract description 34
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Abstract
The invention discloses a kind of drilling and completing fluids to influence evaluation method to rock core grease permeability.The method includes：(1) preparation of rock core and Experimental Flowing Object；(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state；(3) measurement of rock core original oil water penetration rate；(4) measurement of grease permeability after drilling and completing fluids pollute；The numerical value change that front and back oil-water relative permeability is polluted according to drilling and completing fluids, to judge influence of the drilling and completing fluids to rock core.The present invention can evaluate the reservoir protection effect quality of drilling and completing fluids system; this method can fully simulate fluid mobility status when water-oil phase coexists in reservoir; and obtain the changing rule of the respective percolation ability of two-phase fluid; compared to traditional single-phase rock core flowing experiment; its result is more accurate, and directive significance is had more to wellbore construction.This method is mainly used for evaluation of the gas phase permeability more than the rock core of 50 millidarcies.
Description
Technical field
The present invention relates to reservoir protection assessment technique field in oil drilling process, especially a kind of drilling and completing fluids are to rock core
Grease permeability influences evaluation method.
Background technology
Reservoir protection is a system engineering through oil/gas well exploration and development overall process.The internal cause of formation damage is
Reservoir nature, such as lithology, physical property and water flooding characteristic, and the external cause of formation damage is into the outside fluid of reservoir
It influences.Wherein, the intrusion damage of Drilling and completion fluids is the first ring of reservoir damage, is entirely being drilled well construction process always
It contacts and interacts with stratum.When positive differential pressure opens reservoir, solid phase and liquid phase in drilling and completing fluids inevitably enter
Reservoir, to block oil-gas Layer channel and induce the various sensibility of reservoir, such as speed is quick, water-sensitive, acid-sensitive, salt is quick, the quick damage of alkali
Evil, it is seen that influence and extent of damage evaluation of the drilling and completing fluids to reservoir are the important links of reservoir protection work.It is various at present to comment
Valence method is all based on the measurement to in-place permeability, and core test analysis in laboratory is then in various permeability determination methods
Most direct, most reliable method.By simulating the rock core flowing experiment of drilling process, drilling and completing fluids are investigated to experiment rock core infiltration
Rate influences, and evaluates the extent of damage of oil-gas Layer, to preferred drilling and completing fluids formula, formulates rational reservoir protection scheme, is mesh
The major way of preceding each prospect pit and the work of producing well reservoir protection, can be even more related to find oil-gas Layer, correctly evaluate its storage
Can collection performance and oil/gas well obtain the key of high yield.
Oil drilling industry evaluation drilling and completing fluids influence core permeability mainly to carry out oleic permeability recovery at present
The measurement of rate.It measures rock core original permeability first in rock core flowing experiment, is carried out using the drilling and completing fluids being centainly formulated dirty
After dye, core permeability after pollution is redeterminated, to obtain the case where oleic permeability restores.Although this method can be most
Intuitively reflection drilling and completing fluids but can not really reflect the flowing of formation fluid to the damage and reservoir protection effect of rock core
Situation has certain limitation.Because when no matter carrying out oil phase or water phase permeability measurement, only a kind of fluid exists in rock core
Flowing, the result measured can only reflect monophasic fluid by when permeability variation situation；However reservoir in actual production
Fluid is often that water-oil phase coexists, thus investigate two-phase fluid by when core permeability situation of change can be more accurate
Ground reflects underground truth.
In view of the deficiencies of the prior art, the present invention is quasi- is coexisted using relative permeability test method investigation water-oil phase fluid
In the case of its respective permeability situation of change, to obtain the reservoir protection data for more really reflecting reservoir situation.It is opposite to ooze
Saturating rate test is widely used in oil recovery field, and it is pre- to be capable of providing multiphase porous flow dynamic and oilfield water flooding development index in porous media
The important foundation data of survey, permeability saturation curve are the sides such as the calculating of oil field development parameter, reservoir numerical simulation and dynamic analysis
The essential data in face.So-called relative permeability, for being corresponding absolute permeability.When only monophasic fluid is in blowhole
Middle flowing and not have obtained permeability when physics chemical action with rock be absolute permeability, and when heterogeneous fluid coexists
When with flowing in stratum, wherein the size of a certain phase fluid handling capacity in rock, is known as effectively oozing for the phase fluid
The ratio of saturating rate, effective permeability and absolute permeability is the relative permeability of the phase fluid.Denominator as ratio can be with
It is oily permeability under air absolute permeability, 100% water/oil permeability and constraint water state.It is not difficult to find out, it is common at present
The obtained data of rock core flowing experiment method be oil/water phase absolute permeability, that is, obtain water when measuring water phase permeability
Absolute permeability obtains permeability oily under constraint water state when measuring oleic permeability recovery rate.And use relative permeability
The rock core flowing experiment that test equipment and method carry out, can fully simulate mobility status when water-oil phase coexists in reservoir,
And the changing rule of the respective percolation ability of two-phase fluid is obtained, compared to traditional single-phase rock core flowing experiment, result is more
Accurately, directive significance is had more to wellbore construction.
According to displacement mode difference, the method for experimental determination rock core relative permeability includes mainly steady state method and unstable state
Method.By grease, in certain flow ratio, constant speed injects rock sample simultaneously in steady state method test, is by rock core thing in cold store enclosure test
First with a kind of saturated with fluid, displacement is carried out with one other fluid.The advantages of cold store enclosure is that the testing time is short, instrument and equipment ratio
It is relatively simple；But more serious for anisotropism, preferentially water-wet or rock core with mixed wettability or viscosity ratio of oil and water are very big
When and local emulsification situation under be difficult to obtain reliable permeability saturation curve with cold store enclosure；In addition the JBN of cold store enclosure
Computational methods are cumbersome, and error is very big under above-mentioned special status.Therefore integrated reservoir protection evaluation thinking and two side of reliability
Face factor, final choice use steady state method, grease to inject ratio and use 10：1 to 1：10, it substantially being capable of real simulation reservoir fluid
Practical seepage state.It is further noted that the main theoretical basis of the reform of Chinese economic structure that steady state method measures oil-water relative permeability is a Victor
Western seepage theory, and LOW PERMEABILITY RESERVOIR seepage flow does not meet Darcy's law, exists and starts pressure and non linear fluid flow through porous medium section, to seepage flow characteristics
There is large effect, there may be certain deviations for the data obtained, therefore this method is primarily adapted for use in commenting for medium to high permeable rate rock core
Valence.
Currently, other realize drilling and completing fluids to rock core grease permeability shadow using relative permeability test method not yet
Ring the relevant report of evaluation.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of more accurate drilling and completing fluids to rock core
Grease permeability influences evaluation method；This method can more really reflect reservoir fluid seepage flow situation；This method is mainly used for
Medium to high permeable rate rock core is evaluated.
A kind of drilling and completing fluids of the present invention influence evaluation method to rock core grease permeability：
(1) preparation of rock core and Experimental Flowing Object：
Rock core to be measured is dried, claims dry weight, and measure its length, diameter, gas phase permeability, porosity parameter, according to tool
Body evaluation experimental situation preparation experiment fluid-simulated formation water and simulation oil claim rock core vacuumizing saturation simulation water flooding wet
Weight, determines rock core active porosity volume；
(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state：
Rock core is fitted into the core holding unit of dynamic core flooding test device, first measures its water phase permeability, then
Irreducible water saturation is established with oily expelling water method：Oily expelling water first is carried out with low discharge, gradually increase displacement flow is up to not being discharged
Only, irreducible water saturation is obtained；The rock core for establishing irreducible water saturation is packed into the rock core clamping of relative permeability analyzer
After reaching 10-15 times of pore volume with simulation oil displacement in device, the oleic permeability under irreducible water saturation is measured；
(3) measurement of rock core original oil water penetration rate：
Under conditions of keeping total flow certain, the flow proportional that oil, water are pressed to three groups of settings successively injects rock core, waits flowing
When stablizing, core import and export pressure, oil, water flow are recorded, the oil of corresponding three groups of grease flow-rate ratios is calculated in balance quality
Phase, water phase are effectively and relative permeability and corresponding water saturation；
(4) measurement of grease permeability after drilling and completing fluids pollute：
Experiment drilling and completing fluids are chosen, rock core is removed and is fitted into the core holding unit of dynamic core flooding test device,
Cycle a period of time forms mud cake at a certain temperature, then rock core is taken out to the rock core for reloading relative permeability analyzer
In clamper, the oil phases of corresponding three groups of grease flow-rate ratios, water phase are measured effectively and relative permeability and corresponding according to method in (3)
Water saturation；
The numerical value change that front and back oil-water relative permeability is polluted according to drilling and completing fluids, to judge the brill/completion fluid to rock core
Influence, when rock core water phase relative permeability declines larger after pollution, it is believed that the mud cake that the brill/completion fluid is formed has stronger
Plugging function, when oil relative permeability declines smaller after pollution, it is believed that the brill/completion fluid has from de-plugging ability.
In the evaluation method, rock core prepares, and Experimental Flowing Object is prepared, and establishes irreducible water saturation, grease permeability determination, with
And the calculation formula of rock core active porosity volume, water saturation, grease permeability is according to SY/T 5345-2007 " rocks
Related content in middle two-phase fluid relative permeability assay method ".
The dynamic core flooding test device uses II high temperature and pressure rock core the dynamic damage evaluation systems of JHMD-, described
The key technical indexes of relative permeability analyzer：Maximum loop pressure：60MPa, displacement pressure：0-50MPa, maximum operation temperature：
150 DEG C, it is applicable in rock core size：φ 25.4mm × (25-80) mm, displacement flow：0-10mL/min.
The oleic permeability under irreducible water saturation is measured in the step (2), and drilling and completing fluids are measured in step (3), (4)
Circulating temperature is 25 DEG C -120 when drilling and completing fluids pollution rock core in test temperature and step (4) when pollution front and back grease permeability
℃。
Ring pressure is when establishing irreducible water saturation in the step (2) and measuring the oleic permeability under constraint water state
1.5MPa-12.5MPa；It is 5- that test wrapper pressure when drilling and completing fluids pollute front and back grease permeability is measured in step (3), (4)
15MPa；Ring pressure is 6-12MPa when drilling and completing fluids pollute rock core in step (4).
Oil expelling water displacement flow is 0.1-3.0mL/min, low speed displacement when establishing irreducible water saturation in the step (2)
Flow is 0.1-0.3mL/min, and displacement flow is 0.2-2.0mL/min when measuring the oleic permeability under constraint water state.
It is 0.5- that grease total flow when drilling and completing fluids pollute front and back grease permeability is measured in the step (3), (4)
5.0mL/min；Three groups of grease flow-rate ratios are 10:1-1:Between 10.
Grease total flow when drilling and completing fluids pollute front and back grease permeability is measured in the step (3), (4), and 1.0- may be selected
3.0mL/min；Three groups of grease flow-rate ratios may be selected 10:1,5:1,3:1,2:1,3:2,1:1,2:3,1:2,1:3,1:5,1:10 it
In arbitrary three groups of ratios.
Circulation time is 2-5h when drilling and completing fluids pollute rock core in the step (4).
In the step (2), (3), (4) rock core be packed into relative permeability analyzer core holding unit when can no more than
Respectively add one block of hypertonic rock core at rock core both ends when length range, to reduce the influence of end effect.
The present invention has following advantage compared with prior art：Evaluation method of the present invention is based on opposite to rock core grease
The measurement of permeability, experiment are carried out in relative permeability analyzer, can fully be simulated when water-oil phase coexists in reservoir
Fluid mobility status, and the changing rule of the respective percolation ability of two-phase fluid is obtained, it is flowed compared to traditional single-phase rock core real
It tests, result is more accurate, and directive significance is had more to wellbore construction.This method is mainly used for gas phase permeability and is more than 50 millidarcies
Rock core evaluation.
Specific implementation mode
Example 1：
Evaluation experimental slurry (formula：6% sodium bentonite starches+0.2% polyacrylamide PAM+1.0% of+0.2% sodium hydroxide
+ 2% oil-soluble tree of+1.5% high temperature resistance fluid loss agent HX-KYG+2% nanoemulsions of LV-CMC+3%SMP-2+3% polymeric alcohols
Fat) reservoir protection effect, experiment rock core select gas phase permeability be 1385.20 millidarcies artificial sand rock rock core, porosity
It is 27.32%, size is：Length 6.21cm, diameter 2.53cm.
(1) preparation of rock core and Experimental Flowing Object：
Rock core to be measured to be dried, dry weight, experimental temperature is claimed to select 25 DEG C, simulated formation water total salinity is 1000mg/L,
Viscosity is at 25 DEG CSimulation oil is formulated using crude oil and kerosene, density 0.84g/cm3, 25 DEG C
When viscosity beViscosity ratio of oil and water is 3.5:1；By rock core vacuumizing saturation simulation water flooding, claim weight in wet base,
Determine rock core active porosity volume.
(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state：
Rock core is fitted into the core holding unit of dynamic core flooding test device, the infiltration of its water phase is first measured at 25 DEG C
Rate Kw, then irreducible water saturation is established with oil expelling water method：Add ring to press 1.5MPa, is driven with the speed of 0.2mL/min with simulation oil
It replaces, wait adding up after water speed slows down to gradually increase flow up to 2.0mL/min, constantly record is displaced water, calculated in rock core
Irreducible water saturation Sws, until not being discharged.The rock core for establishing irreducible water saturation is packed into relative permeability to measure
In the core holding unit of instrument, ring is added to press 5.5MPa, insulating box, 25 DEG C of holding constant temperature 2 hours or more is opened, with 1.0mL/min's
Flow, up to after 10 times of pore volumes, measures the oleic permeability K under irreducible water saturation with simulation oil displacemento(Sws)。
(3) measurement of rock core original oil water penetration rate：
Set ring pressure be 5MPa, holdings total flow be 2.0mL/min, at 25 DEG C by oil phase/water phase flow-rate ratio be 10:1
Fluid-mixing inject rock core, after pressure, stability of flow, record core import and export pressure, oil, water flow, balance quality unloads
Ring pressure, removal of core are weighed, and water saturation S is calculatedwAnd oil phase effective permeability Koe, water phase effective permeability Kwe, oil phase
Relative permeability KroWith water phase relative permeability Krw；It is 3 to change oil phase/water phase flow-rate ratio:2 and 1:10, it repeats the above steps,
Obtain the oil phases of corresponding two groups of grease flow-rate ratios, water phase effectively and relative permeability and water saturation.
(4) measurement of grease permeability after drilling and completing fluids pollute：
Experiment drilling fluid is chosen, rock core is removed and is fitted into the core holding unit of dynamic core flooding test device, if
It is 6MPa to determine ring pressure, and 2h is recycled at 25 DEG C and forms mud cake；Then rock core taking-up is reloaded into relative permeability analyzer
In core holding unit, according to method in (3) measure the oil phases of corresponding three groups of grease flow-rate ratios, water phase effectively and relative permeability and
Corresponding water saturation.
Example 2：
Evaluation experimental slurry (formula：+ 0.5% amine of 5% sodium bentonite slurry+0.3%IND30+3%SMP-2+3% nanoemulsions
+ 2% Hydrophobic Modified Starch HNC-1+1.5% nano-calcium carbonates of+0.4% aluminium base polymer of base polyalcohols) reservoir protection effect, it is real
It tests rock core and selects the green eastern 8 well dune shape rock cores of triumph, be derived from 1212.10~1214.15 meters of depth, porosity 26.15%, gas
Phase permeability is 399.78 millidarcies, and size is：Length 6.23cm, diameter 2.53cm.
(1) preparation of rock core and Experimental Flowing Object：
Rock core to be measured is dried, dry weight is claimed, according to green eastern 8 well reservoir geology situation choice experiment temperature and preparation experiment stream
Body-simulated formation water and simulation oil；Wherein, experimental temperature select 46 DEG C, simulated formation water total salinity be 4755mg/L, chlorine from
Sub- content is 1991mg/L, and potassium sodium content is 1223.72mg/L, and heavy carbonic radical content is 258mg/L, 8.1,46 DEG C of pH value
When viscosity beSimulation oil is formulated using the block degassed crude with kerosene, density 0.92g/
cm3, viscosity is at 46 DEG CViscosity ratio of oil and water is 48:1；By rock core vacuumizing saturation simulation water flooding,
Claim weight in wet base, determines rock core active porosity volume.
(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state：
Rock core is fitted into the core holding unit of dynamic core flooding test device, the infiltration of its water phase is first measured at 46 DEG C
Rate Kw, then irreducible water saturation is established with oil expelling water method：Add ring to press 5.0MPa, is driven with the speed of 0.3mL/min with simulation oil
It replaces, wait adding up after water speed slows down to gradually increase flow up to 3.0mL/min, constantly record is displaced water, calculated in rock core
Irreducible water saturation Sws, until not being discharged.The rock core for establishing irreducible water saturation is packed into relative permeability to measure
In the core holding unit of instrument, ring is added to press 8MPa, insulating box, 46 DEG C of holding constant temperature 2 hours or more is opened, with the stream of 2.0mL/min
Amount, up to after 15 times of pore volumes, measures the oleic permeability K under irreducible water saturation with simulation oil displacemento(Sws)。
(3) measurement of rock core original oil water penetration rate：
Set ring pressure be 10MPa, holdings total flow be 3.0mL/min, at 46 DEG C by oil phase/water phase flow-rate ratio be 5:1
Fluid-mixing inject rock core, after pressure, stability of flow, record core import and export pressure, oil, water flow, balance quality unloads
Ring pressure, removal of core are weighed, and water saturation S is calculatedwAnd oil phase effective permeability Koe, water phase effective permeability Kwe, oil phase
Relative permeability KroWith water phase relative permeability Krw；It is 2 to change oil phase/water phase flow-rate ratio:3 and 1:5, it repeats the above steps, obtains
Effectively and relative permeability and water saturation to the oil phases of corresponding two groups of grease flow-rate ratios, water phase.
(4) measurement of grease permeability after drilling and completing fluids pollute：
Experiment drilling fluid is chosen, rock core is removed and is fitted into the core holding unit of dynamic core flooding test device, if
It is 8MPa to determine ring pressure, and 3h is recycled at 46 DEG C and forms mud cake；Then rock core taking-up is reloaded into relative permeability analyzer
In core holding unit, according to method in (3) measure the oil phases of corresponding three groups of grease flow-rate ratios, water phase effectively and relative permeability and
Corresponding water saturation.
Example 3：
Evaluation scene slurry (formula：5~8% sodium bentonites starch+0.2%~0.3% sodium hydroxide+0.3%~0.5% day
The right macromolecule coating inhibitor high temperature resistance fluid loss agent HX-KYG+2%~3% of IND30+1.0%~1.5% polymeric alcohols+1%~
+ 2%~3% Waterproof lock agent YFS-3 of the 2% natural polymer fluid loss additive ideal fillings of NAT20+3%~5% agent) reservoir protect
Effect is protected, experiment rock core selects the northern 326 well Dongying Formation rock cores of the triumph field of razor clam, is derived from 3489.00~3502.00 meters of depth, porosity
It is 17.87%, gas phase permeability is 93.90 millidarcies, and size is：Length 6.26cm, diameter 2.53cm.
(1) preparation of rock core and Experimental Flowing Object：
Rock core to be measured is dried, dry weight is claimed, according to the northern 326 well reservoir geology situation choice experiment temperature of the field of razor clam and preparation experiment
Fluid-simulated formation water and simulation oil；Wherein, experimental temperature selects 120 DEG C, and simulated formation water total salinity is 10616mg/L,
Chloride ion content is 6215mg/L, and viscosity is when 8,120 DEG C of pH valueSimulation oil is de- using the block
Gas crude oil is formulated with kerosene, density 0.86g/cm3, viscosity is at 120 DEG CViscosity ratio of oil and water
It is 1.2:1；By rock core vacuumizing saturation simulation water flooding, claims weight in wet base, determine rock core active porosity volume.
(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state：
Rock core is fitted into the core holding unit of dynamic core flooding test device, its water phase is first measured at 120 DEG C oozes
Saturating rate Kw, then irreducible water saturation is established with oil expelling water method：Ring is added to press 10.0MPa, with simulation oil with the speed of 0.1mL/min
Displacement, wait adding up after water speed slows down to gradually increase flow up to 1.0mL/min, constantly record displaces water, calculates rock core
In irreducible water saturation Sws, until not being discharged.The rock core for establishing irreducible water saturation is packed into relative permeability to survey
In the core holding unit for determining instrument, ring is added to press 12.5MPa, insulating box, 120 DEG C of holding constant temperature 2 hours or more is opened, with 0.2mL/
The flow of min, up to after 15 times of pore volumes, measures the oleic permeability K under irreducible water saturation with simulation oil displacemento(Sws)。
(3) measurement of rock core original oil water penetration rate：
Set ring pressure be 15MPa, holdings total flow be 1.0mL/min, at 120 DEG C by oil phase/water phase flow-rate ratio be 3:1
Fluid-mixing inject rock core, after pressure, stability of flow, record core import and export pressure, oil, water flow, balance quality unloads
Ring pressure, removal of core are weighed, and water saturation S is calculatedwAnd oil phase effective permeability Koe, water phase effective permeability Kwe, oil phase
Relative permeability KroWith water phase relative permeability Krw；It is 1 to change oil phase/water phase flow-rate ratio:1 and 1:3, it repeats the above steps, obtains
Effectively and relative permeability and water saturation to the oil phases of corresponding two groups of grease flow-rate ratios, water phase.
(4) measurement of grease permeability after drilling and completing fluids pollute：
Experiment drilling fluid is chosen, rock core is removed and is fitted into the core holding unit of dynamic core flooding test device, if
It is 12MPa to determine ring pressure, and 5h is recycled at 120 DEG C and forms mud cake；Then rock core taking-up is reloaded into relative permeability analyzer
Core holding unit in, measure the oil phases of corresponding three groups of grease flow-rate ratios, water phase effectively and relative permeability according to method in (3)
And corresponding water saturation.
The evaluation result of embodiment
1 embodiment evaluation result of table
Oil phase and water phase permeability of the rock core after drilling fluid contamination have one in embodiment it can be seen from 1 result of table
Determine the reduction of degree.Water phase relative permeability all shows significantly to reduce in three embodiments, illustrates three kinds of drilling fluids
The water blockoff ability of system is all relatively outstanding, especially the drilling fluid system in embodiment 2, is more up to water phase sealing ratiod
96.8% or so, illustrate that it can effectively prevent filtrate from invading reservoir in wellbore construction；It is oily after drilling fluid contamination in embodiment 1
Phase relative permeability obtains certain recovery, but recovery extent is not high；Oil relative permeability still can after being polluted in embodiment 2
Higher numerical value is enough kept, it is certain from de-plugging ability to illustrate that the drilling fluid has, oleic permeability is constructed with completion to be made
Industry time lengthening gradually rises, can return automatically mediate it is stifled, thus it is speculated that the reason is that Hydrophobic Modified Starch in the drilling fluid system
With nano-calcium carbonate both inorganic agents can in drilling process improvement of mud cake, form hydrophobic channel in mud cake, be
Effective oil flow channel is established in in-place oil outflow；Oil relative permeability declines by a big margin after being polluted in embodiment 3, or even super
Having crossed water phase permeability reduces amplitude, it is seen that and the formed mud cake of the drilling fluid system is all very strong to the shut-off capacity of grease, and
It needs to be acidified after completion, the means de-plugging such as pressure break.In conclusion drilling fluid reservoir protection effect is best in embodiment 2,
It is well suited for the wellbore construction for green Dong8Jing.
It can be used in commenting it can be seen that drilling and completing fluids provided by the present invention influence evaluation method to rock core grease permeability
The reservoir protection effect quality of valence drilling and completing fluids system, the numerical value that front and back oil-water relative permeability is polluted according to drilling and completing fluids become
Change, to judge influence of the drilling and completing fluids to rock core, to further instruct live drilling fluid construction.This method can be simulated fully
Fluid mobility status when water-oil phase coexists in reservoir, and the changing rule of the respective percolation ability of two-phase fluid is obtained, compared with
In traditional single-phase rock core flowing experiment, result is more accurate, has in terms of drilling and completing fluids reservoir protection evaluation of effect real
Border is worth.
Claims (9)
1. a kind of drilling and completing fluids influence evaluation method to rock core grease permeability, it is characterized in that including：(1) rock core and Experimental Flowing Object
Preparation：Rock core to be measured is dried, claims dry weight, and measure its length, diameter, gas phase permeability, porosity parameter, according to specific
Evaluation experimental situation preparation experiment fluid --- simulated formation water and simulation oil claims rock core vacuumizing saturation simulation water flooding
Weight in wet base determines rock core active porosity volume；(2) it establishes irreducible water saturation and measures the oleic permeability under constraint water state：
Rock core is fitted into the core holding unit of dynamic core flooding test device, first measures its water phase permeability, then uses oily expelling water
Method establishes irreducible water saturation：Oily expelling water first is carried out with low discharge, displacement flow is gradually increased until not being discharged, obtains beam
Tie up water saturation；The rock core for establishing irreducible water saturation is fitted into the core holding unit of relative permeability analyzer with simulation
After oily displacement reaches 10-15 times of pore volume, the oleic permeability under irreducible water saturation is measured；(3) rock core original oil water penetration
The measurement of rate：Under conditions of keeping total flow certain, the flow proportional that oil, water are pressed to three groups of settings successively injects rock core, waits flowing
When dynamic stability, core import and export pressure, oil, water flow are recorded, the oil of corresponding three groups of grease flow-rate ratios is calculated in balance quality
Phase, water phase are effectively and relative permeability and corresponding water saturation；(4) measurement of grease permeability after drilling and completing fluids pollute：
Experiment drilling and completing fluids are chosen, rock core is removed and is fitted into the core holding unit of dynamic core flooding test device, in a constant temperature
Degree lower cycle a period of time forms mud cake, then rock core is taken out to the core holding unit for reloading relative permeability analyzer
In, measure the oil phases of corresponding three groups of grease flow-rate ratios, water phase effectively and relative permeability and corresponding aqueous according to method in (3)
Saturation degree；The numerical value change that front and back oil-water relative permeability is polluted according to drilling and completing fluids, to judge the drilling and completing fluids to rock core
It influences, when rock core water phase relative permeability declines larger after pollution, it is believed that the mud cake that the drilling and completing fluids are formed has stronger stifled
Water acts on, when oil relative permeability declines smaller after pollution, it is believed that the drilling and completing fluids have from de-plugging ability.
2. drilling and completing fluids as described in claim 1 influence evaluation method to rock core grease permeability, it is characterized in that：Step (1)-
(4) rock core described in measures, Experimental Flowing Object is prepared, it is effective to establish irreducible water saturation, grease permeability determination and rock core
Pore volume, water saturation, the calculation formula of grease permeability are according to SY/T5345-2007 " two-phase fluids in rock
Related content in relative permeability assay method ".
3. drilling and completing fluids as claimed in claim 1 or 2 influence evaluation method to rock core grease permeability, it is characterized in that：It is described
Dynamic core flooding test device uses II high temperature and pressure rock core the dynamic damage evaluation systems of JHMD-.
4. drilling and completing fluids as claimed in claim 3 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(2) oleic permeability under irreducible water saturation, step (3) and (4) middle front and back grease of drilling and completing fluids pollution that measures is measured in ooze
Circulating temperature in test temperature and step (4) when saturating rate when drilling and completing fluids pollution rock core is 25 DEG C -120 DEG C.
5. drilling and completing fluids as claimed in claim 4 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(2) ring pressure when establishing irreducible water saturation in and measuring the oleic permeability under constraint water state is 1.5MPa-12.5MPa；
The test wrapper pressure measured in step (3), (4) when drilling and completing fluids pollute front and back grease permeability is 5-15MPa；It is bored in step (4)
Ring pressure when completion fluid pollutes rock core is 6-12MPa.
6. drilling and completing fluids as claimed in claim 5 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(2) oily expelling water displacement flow when establishing irreducible water saturation in is 0.1-3.0mL/min, and low speed displacement flow is 0.1-
0.3mL/min, displacement flow when measuring the oleic permeability under constraint water state are 0.2-2.0mL/min.
7. drilling and completing fluids as claimed in claim 6 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(3), the grease total flow measured in (4) when drilling and completing fluids pollute front and back grease permeability is 0.5-5.0mL/min；Three groups of greases
Flow-rate ratio is 10:1-1:Between 10.
8. drilling and completing fluids as claimed in claim 7 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(4) circulation time when drilling and completing fluids pollute rock core in is 2-5h.
9. drilling and completing fluids as claimed in claim 8 influence evaluation method to rock core grease permeability, it is characterized in that：The step
(2), in rock core two when no more than length range when rock core is packed into the core holding unit of relative permeability analyzer in (3), (4)
End respectively adds one block of hypertonic rock core.
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| CN109488290A (en) * | 2017-09-12 | 2019-03-19 | 中国石油天然气股份有限公司 | Evaluation method and device of the drilling fluid to reservoir damage degree |
| CN108489878B (en) * | 2018-02-06 | 2020-05-15 | 中国石油大学(华东) | Facies percolation curve correction method for iteratively eliminating end effect based on numerical simulation |
| CN109932296B (en) * | 2019-02-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Method for quantitatively representing dynamic change of Jamin effect |
| CN110160932B (en) * | 2019-06-03 | 2023-12-15 | 西南石油大学 | Oil-water relative permeability curve testing device and testing method |
| CN112147042A (en) * | 2020-09-23 | 2020-12-29 | 西南石油大学 | Device and method for measuring steady-state oil-water phase seepage based on oil-water circulation principle |
| CN113655082B (en) * | 2021-10-15 | 2021-12-21 | 西南石油大学 | Optimization method for evaluating well-entering fluid of tight shale reservoir |
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