CN104632158B - Oil well response stage dividing and distinguishing method under carbon dioxide miscible displacement condition - Google Patents
Oil well response stage dividing and distinguishing method under carbon dioxide miscible displacement condition Download PDFInfo
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- CN104632158B CN104632158B CN201310571568.4A CN201310571568A CN104632158B CN 104632158 B CN104632158 B CN 104632158B CN 201310571568 A CN201310571568 A CN 201310571568A CN 104632158 B CN104632158 B CN 104632158B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
Abstract
The invention provides an oil well response stage dividing and distinguishing method under a carbon dioxide miscible displacement condition. The method comprises the steps that original carbon dioxide content Ci and original solution gas-oil ratio Rt of an oil reservoir and carbon dioxide solubility Ri under different pressure P conditions are obtained; the static pressure Px of the stratum where an oil well is located is obtained through a pressure recovery curve; the production gas oil ratio Rx and the well mouth carbon dioxide content Cx recently are monitored; the changing situation of daily output recently is analyzed; an oil well response stage dividing standard under the condition of the static pressure Px of the stratum where the oil well is located is established; the well mouth carbon dioxide content Cx, the production gas oil ratio Rx and the output changing situation are compared with the oil well response stage dividing standard to judge the current response stage of the oil well. The method is closely combined with production practice, emphasizes the objectivity and overcomes subjectivity, the scientificity is enhanced remarkably, operation procedures are clear and reasonable, and a firm theoretical basis is laid for reservoir engineering analysis and site dynamic regulation.
Description
Technical field
The present invention relates to reservoir performance analysis research field, especially relate to oil under the conditions of a kind of carbon dioxide mixed phase drives
Well is subject to effect divided stages and method of discrimination.
Background technology
Carbon dioxide mixed phase drives technology and is particularly difficult to note in low-permeability oil deposit as improving one of recovery efficiency technique at present
In the extra-low permeability oil reservoirs exploitation of water exploitation, there is obviously advantage, both at home and abroad technology is driven to carbon dioxide mixed phase and carry out
Substantial amounts of indoor theory research and the practice of Water Alternate Gas mining site, but being imitated for oil well under carbon dioxide mixed phase drive effect
How feature and effect stage are divided and were not also carried out systematic research, and the reservoir engineering method of routine and experience pair
Oil well production feature subjectivity under the conditions of gas drive is strong, lack the clear and definite, operating procedure of reliability, science, simultaneously daily
Do not have in production management process yet a set of effective method of discrimination come to see clearly oil well be subject to imitate feature and residing by the effect stage with
And Production trend, this result in carry out the carbon dioxide miscible displacement of reservoir hide blindness in engineering research and production management process and
Not scientific.We have invented oil well under the conditions of a kind of new carbon dioxide mixed phase drives for this and be subject to effect divided stages and differentiation side
Method, solves above technical problem.
Content of the invention
It is an object of the invention to provide oil well is subject to imitate the side of divided stages and differentiation under the conditions of a kind of carbon dioxide mixed phase drives
Method PCCGP, under the conditions of effectively any a bite carbon dioxide mixed phase of identification drives, oil well is imitated the residing stage and following Production development becomes
The new method of gesture.
The purpose of the present invention can be achieved by the following technical measures：Under the conditions of carbon dioxide mixed phase drives, oil well is subject to the effect stage
Divide and method of discrimination, under the conditions of this carbon dioxide mixed phase drives, oil well is included by effect divided stages and method of discrimination：Step 1, asks
Take oil reservoir original carbon dioxide content CiWith original dissolved gas oil ratio Rt, and the carbon dioxide under different pressures P-condition is molten
Solution degree Ri；Step 2, asks for oil well place stratum static pressure Px by pressure build-up curve；Step 3, monitoring nearly a period of time produces
Gas-oil ratio Rx and well head carbon dioxide content Cx；Step 4, analyzes the day degree change of production situation of nearly a period of time；Step 5, builds
Vertical oil well place stratum static pressure PxUnder the conditions of oil well be subject to effect divided stages standard；And step 6, by well head carbon dioxide content
Cx, production gas-oil ratio RxAnd change of production situation is subject to effect divided stages Comparison of standards with oil well, judges that oil well is residing at present and imitated
Stage.
The purpose of the present invention also can be achieved by the following technical measures：
In step 1, original dissolved gas oil ratio RtComputing formula be：
Rt=Vgρo/Wo
Wherein, VgFor deviating from the volume of gas, ρ under the status of criterion from crude oiloFor oil density after degassing, WoAfter degassing
Crude quality.
In step 1, oil reservoir original carbon dioxide content CiComputing formula be：
Ci=Vc1/Vg
Wherein, Vc1It is in VgIn the CO that detects2Volume content.
In step 1, by CO2Ask for CO under the conditions of different pressures with the experiment of crude oil system saturation pressure2In crude oil
Maxima solubility Ri.
In step 2, straightway pressure build-up curve being also referred to as He Nuo extends toIntersecting, the corresponding pressure of intersection point
Power is oil well place stratum static pressure Px, wherein, tpFor the oil well constant rate of production production time, Δ t is the closed-in time.
In step 3, when monitoring production gas-oil ratio Rx, after crude oil is flowed out by well head, crude oil separates with solution gas, leads to
Excessively stream gauge measures the solution gas gas volume of daily abjection and the crude oil volume produced in oil tank, and ratio between two is daily
Production gas-oil ratio Rx.
In step 3, when monitoring well head carbon dioxide content Cx, take the solution gas sample volume of abjection by sampler
Vx, is detected to sample using gas chromatograph in laboratory, the CO detecting2Volume content Vcx, well head carbon dioxide contains
Amount Cx=Vcx/Vx.
In step 4, oil well being subject to effect divided stages is not to be subject to the effect stage, is driven section, mixed phase section stage, nearly gas by effect elasticity
Alter stage and has channeling stage.
It is not subject to the effect stage not to be subject to CO for oil well2Drive impact and be still within pure elasticity drive state, Cx≈Ci, Rx≈Rt, produce gas
Oil is all stable than Rx and well head carbon dioxide content Cx two parametric characteristics, and yield shows as elasticity and successively decreases.
Being driven section by effect elasticity is that oil well has been subject to CO2Drive impact, show as energy and recover, gas displacement front not yet reaches shaft bottom；Cx
≈Ci, Rx≈Rt, production gas-oil ratio Rx and well head carbon dioxide content Cx two parametric characteristics are all stable, and yield shows as successively decreasing
Slow down or start occur surely increasing section；
The mixed phase section stage starts to reach shaft bottom for miscible bank leading edge；Ci《Cx《Ri/(Rt+Ri)/2, Rt《Ri《(Rt+Ri)/2, raw
Producing gas-oil ratio Rx and well head carbon dioxide content Cx two parametric characteristics is all very fast increase, and yield shows as significantly surely increasing section.
The nearly has channeling stage is miscible bank trailing edge close to shaft bottom；Ri/Ri/(Rt+Ri)/2《Ci《Rx/(Rt+Ri), (Rt+Ri)/2《Rt
《Ri《(Rt+Ri)/2, production gas-oil ratio Rx and well head carbon dioxide content Cx two parametric characteristics are all quick increase, and yield shows
For significantly successively decreasing or fluctuating.
The has channeling stage is supercritical CO2Band reaches shaft bottom, Ri/(Rt+Ri)<Ci,(Rt+Ri)<Rt, production gas-oil ratio Rx and well
Mouth carbon dioxide content Cx two parametric characteristics show as maintaining high level（Level）Fluctuation；Yield characteristics show as higher than not
Successively decreased by the effect stage or fluctuated.
Under the conditions of carbon dioxide mixed phase in the present invention drives, oil well is subject to effect divided stages and method of discrimination, to oil field titanium dioxide
Under the conditions of carbon mixed phase drives, oil well is subject to effect status analysis, there is provided a kind of oil well is subject to effect divided stages and to sentence method for distinguishing PCCGP comprehensive
Close diagnostic method（Pressure-CO2content-GOR-Production）, effectively any a bite carbon dioxide mixed phase of identification drive bar
Under part, oil well is imitated residing stage and following Production development trend.Compared with conventional empirical method, new method is intimately associated production
Actual, emphasize objectivity, overcome subjectivity, science is remarkably reinforced, and operating procedure clear and rational.One tool of the application present invention
The oil well that body is implemented is subject to obtain remarkable result, according to the above criteria for classifying, 8 mouthfuls of wells in 19 mouthfuls of producing wells in effect analysis（Containing periphery 5
Mouth well）Imitated, 9 mouthfuls of wells are in and drive stage or nearly has channeling stage by the effect elastic drive stage, by effect mixed phase, and 2 mouthfuls of wells are gassed-out well,
But lesser extent.Thus having established solid theoretical basiss for the dynamic adaptation of reservoir engineering analysis and scene.
Brief description
Fig. 1 is subject to a concrete reality of effect divided stages and method of discrimination for oil well under the conditions of the carbon dioxide mixed phase drive of the present invention
The flow chart applying example；
Fig. 2 is pure 17-1 block Solubilities of Carbon Dioxide in a specific embodiment of the present invention and pressure dependence figure；
Fig. 3 is subject to effect oil well day degree production curve for pure 17-1 block representative center in a specific embodiment of the present invention.
Specific embodiment
Above and other objects, features and advantages for enabling the present invention become apparent, and cited below particularly go out preferably to implement
Example, and coordinate institute's accompanying drawings, it is described in detail below.
Laboratory test shows, carbon dioxide dissolubility in crude oil raises with pressure rise, in a certain pressure PxBar
Dissolubility in crude oil for the part carbon dioxide is Rx.Under theoretical condition, when reservoir pressure is maintained at certain level（Higher than oil reservoir
Saturation pressure）, the production gas-oil ratio of oil well and carbon dioxide content are certain：Carbon dioxide miscible bank leading edge breakthrough well bottom
Before, well head carbon dioxide content is equal to carbon dioxide content C in prime stratumi, production gas-oil ratio is equal to primary Korean pine forest
Rt, after gas displacement front is broken through, entrance mixed phase drives the stage, and shaft bottom carbon dioxide content is stepped up, and gas-oil ratio is also stepped up,
Progressively terminate with miscible bank, oil well reaches the nearly has channeling stage, when being further continued for dissolving more carbon dioxide in crude oil,
Carbon dioxide is existed with free state form, it will the quick shaft bottom that reaches forms has channeling.Production practices show, yield when oil well is imitated
Variation characteristic is mainly shown as following several：Ascending-type, stable type, repeatedly lifting type（Due to by has channeling, multidirectional note adopt corresponding,
The impact of the factors such as reservoir heterogeneity, well spacing diversity, assumes the feature that multisection type by a small margin lifts repeatedly yield more）.Logical
Cross oil well under the conditions of the drive of the carbon dioxide mixed phase in a certain pressure as shown in table 1 is formulated in above analysis and be subject to effect divided stages mark
Accurate.
Under the conditions of table 1 carbon dioxide mixed phase drives, oil well is imitated and is seen gas divided stages standard（PxUnder the conditions of）
This divided stages standard is that the oil well of our inventions is subject to effect stage discretion method PCCGP comprehensive distinguishing method
" pressure carbon dioxide content production gas-oil ratio yield " method, oil under the conditions of any a bite carbon dioxide mixed phase being driven
Well arbitrary effect stage is differentiated.
As shown in figure 1, oil well is subject to effect divided stages and method of discrimination under the conditions of the carbon dioxide mixed phase that Fig. 1 is the present invention drives
A specific embodiment flow chart.
In step 101, ask for oil reservoir original carbon dioxide content CiWith original dissolved gas oil ratio Rt, and by experiment
Determine the Solubilities of Carbon Dioxide R under different pressures P-conditioni.
Reservoir fluid high pressure property studies bottom-hole sampling method：Choose normal production well of just going into operation（In well well killing fluid and
Miscella is drained）, crude oil water containing is less than 2%.Survey flowing pressure gradient before sampling, every 200 more than oil reservoir, stop a bit, at least survey 3-5
Point, converts stream pressure at sample point it is necessary to keep sampling point pressure above bubble point pressure according to barometric gradient, is 1000- with volume
1200ml sampler, sample number is no less than 4, and sampler is put to sample point（In the middle part of oil reservoir）Fill crude oil to sampler, close
Send into laboratory in time after closing sampler, the in-place oil in sampler is proceeded in laboratory PVT cylinder, is again pressurized to oil reservoir
Pressure, constantly shakes PVT cylinder in pressure process or moves up and down by magnetic stirrer in cylinder, make gas all uniformly be dissolved in oil
In, stablize and treat that pressure and temperature reaches poised state for a period of time, keep reservoir temperature, pressure condition, slightly open PVT cylinder valve
Door, slowly enters pump, releases a small amount of oil sample and enter separator separation, the reading of oil sample volume in forward and backward PVT cylinder of draining the oil in PVT cylinder
Number difference is the subsurface volume Δ V releasing oilf.The separated device of oil reservoir released separates, gas volume Vg(status of criterion lower volume,
m3) measured by gasometer；After degassing, the volume of crude oil is by crude quality W after deaeratingoDivided by degassed crude density po(20 DEG C of conditions
Under, t/m3) obtain.Primary Korean pine forest Rt：
Rt=Vgρo/Wo
It is V using gas chromatograph to volume in laboratorygSolution gas detected, the CO that can detect2Volume contains
Amount Vc1Content in solution gas, oil reservoir original carbon dioxide content Ci=Vc1/Vg
By CO2CO under the conditions of different pressures can be asked for the experiment of crude oil system saturation pressure2Maximum molten in crude oil
Solution degree Ri：By the in-place oil preparing sample（Quality is Wo）Keep single-phase and go in high pressure PVT analyser, in formation temperature
Under, inject CO2Gas, is forced into P1, pressure process is constantly shaken PVT cylinder or moves up and down by magnetic stirrer in cylinder, make
Gas is all uniformly dissolved in oil, until can not continue to dissolve CO2Till, injection rate is V1, and stable a period of time reaches phase
Stable no free CO2Exist, CO under this pressure2In crude oil, maxima solubility is R1=V1/Wo, same method is forced into P2、
P3……P8, measure maximum CO under each pressure2Injection rate V2、V3……V8, calculate CO under each pressure2Maximum dissolving in crude oil
Spend for R2、R3……R8, RiIt is plotted on rectangular axes with corresponding pressure P and obtain CO2Dissolubility and the graph of a relation of pressure.Stream
Journey enters into step 102.
In step 102, oil well place stratum static pressure Px is asked for by pressure build-up curve.
Pressure build-up curve method of testing：It is assumed that a bite well A is with constant rate of production q（m3/d）Produce tp(h) time, then
Closing well carries out pressure buildup test（Enter piezometer under shaft bottom）, bottom pressure P after monitoring closing wellws(Δ t) is from closing well Δ t（h）
Arrive（tp+Δt）The bottom pressure changing value in moment, this value is the scatterplot value of a nearly straight line.According to theoretical He Nuo（Horner）Public
Formula：
P can be drawn on semilog coordinate axlews(Δ t) andRelation curve be obtained by pressure recover bent
Line is also referred to as He Nuo（Horner）Curve, this curve is a straight line.He Nuo（Horner）The straightway of curve extends toIntersecting, intersection point corresponding pressure is referred to as " extrapolated pressure " Px, original formation pressure Pi is equal to for undeveloped reserves, right
Represent current stratum static pressure in developing oil reservoir, as striked stratum static pressure Px.Flow process enters into step 103.
In step 103, record nearly a period of time（Three months about）Production gas-oil ratio Rx and well head carbon dioxide content prison
Survey Cx.
Monitoring production gas-oil ratio Rx:After crude oil is flowed out by well head, due to the abjection of reduced pressure solution gas, divided by gravity
Different, crude oil separates with solution gas, is measured in oil tank by effusion meter（Under the status of criterion）The solution gas gas volume of daily abjection
And the crude oil volume produced, the as daily production gas-oil ratio Rx of ratio between two；
Monitoring well head carbon dioxide content Cx：Take the solution gas sample volume Vx of abjection by sampler, in laboratory profit
With gas chromatograph, sample is detected, the CO that can detect2Volume content Vcx, well head carbon dioxide content Cx=Vcx/
Vx.Flow process enters into step 104.
In step 104, analysis is near for a period of time（Three months about）Day degree change of production situation.Flow process enters into step
Rapid 105.
In step 105, P is set up according to table 1xUnder the conditions of oil well be subject to effect divided stages standard.
It is not subject to the effect stage：This stage oil well is not subject to CO2Drive and affect the pure elasticity drive state that still comes in and goes out, Cx≈Ci, Rx≈Rt, two
Parametric characteristics are all stable, and yield shows as elasticity and successively decreases；
Driven section by effect elasticity：This stage oil well has been subject to CO2Drive impact, be mainly shown as that energy recovers, gas displacement front is not yet
Reach shaft bottom；Cx≈Ci, Rx≈Rt, two parametric characteristics are all stable, and yield shows as successively decreasing and slows down or start occur surely increasing section；
The mixed phase section stage：This stage miscible bank leading edge starts to reach shaft bottom；Ci《Cx《Ri/(Rt+Ri)/2, Rt《Ri《(Rt+
Ri)/2, two parametric characteristics are all very fast increase, and yield shows as significantly surely increasing section；
The nearly has channeling stage：This stage miscible bank trailing edge is close to shaft bottom；Ri/Ri/(Rt+Ri)/2《Ci《Rx/(Rt+Ri), (Rt+
Ri)/2《Rt《Ri《(Rt+Ri)/2, two parametric characteristics are all quick increase, and yield shows as significantly successively decreasing or fluctuating；
The has channeling stage:This stage supercritical CO2Band reaches shaft bottom, Ri/(Rt+Ri)<Ci,(Rt+Ri)<Rt, two parametric characteristics tables
It is now to maintain high level（Level）Fluctuation；Yield characteristics show as being higher than to be successively decreased by the effect stage or fluctuate.Flow process is entered
Enter to step 106.
In step 106, Cx、RxAnd change of production situation and Comparison of standards can determine whether oil well residing at present by effect rank
Section.Flow process terminates.
It should be clear that, Ci、Rt, P～RiRelation curve is all parameter known to oil reservoir Working Out The Scheme, Cx、RxIt is
General monitoring project in daily production process, the acquisition of therefore above parameter is easier, and PxMonitoring be to obtain in the present invention
Obtain the larger parameter of difficulty if it is possible to ensure a season to monitor Px, then being imitated of oil well is judged by the present invention
The credibility in stage is high.
Fig. 2 is Solubilities of Carbon Dioxide in a specific embodiment of the present invention and pressure dependence figure.Can be seen that in Fig. 2
Carbon dioxide dissolubility in crude oil increases with pressure rise, under the conditions of 30MPa, Solubilities of Carbon Dioxide 200m3/t.
Under the conditions of table 2 drives for carbon dioxide mixed phase in a specific embodiment of the present invention, oil well is subject to effect divided stages standard,
Under the conditions of 30MPa, original carbon dioxide content 5%, primary Korean pine forest 50m3/t.
Under the conditions of table 2 carbon dioxide mixed phase drives, oil well is subject to effect divided stages standard
Fig. 3 is subject to effect oil well day degree production curve for oil clot representative center in a specific embodiment of the present invention, in figure 3
, by carrying out on effect oil well day degree production curve being divided by the effect stage, the oil well output being in nearly has channeling will for oil clot representative center
It is in and successively decreases and fluctuation tendency, obtain higher credibility, demonstrate reasonability and the correctness in division stage.
Claims (10)
1. under the conditions of carbon dioxide mixed phase drives, oil well is subject to effect divided stages and method of discrimination it is characterised in that this carbon dioxide mixes
Under the conditions of mutually driving, oil well is included by effect divided stages and method of discrimination：
Step 1, asks for oil reservoir original carbon dioxide content CiWith original dissolved gas oil ratio Rt, and under different pressures P-condition
Solubilities of Carbon Dioxide Ri；
Step 2, asks for oil well place stratum static pressure Px by pressure build-up curve；
Step 3, monitors production gas-oil ratio Rx and well head carbon dioxide content Cx；
Step 4, analyzes day degree change of production situation；
Step 5, sets up oil well place stratum static pressure PxUnder the conditions of oil well be subject to effect divided stages standard；And
Step 6, by well head carbon dioxide content Cx, production gas-oil ratio RxAnd change of production situation is subject to effect divided stages with oil well
Comparison of standards, judge oil well residing at present by effect the stage.
2. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 1, original dissolved gas oil ratio RtComputing formula be：
Rt=Vgρo/Wo
Wherein, VgFor deviating from the volume of gas, ρ under the status of criterion from crude oiloFor oil density after degassing, WoFor crude oil after degassing
Quality.
3. under the conditions of carbon dioxide mixed phase according to claim 2 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 1, oil reservoir original carbon dioxide content CiComputing formula be：
Ci=Vc1/Vg
Wherein, Vc1It is in VgIn the CO that detects2Volume content.
4. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 1, by CO2Ask for CO under the conditions of different pressures with the experiment of crude oil system saturation pressure2In crude oil
Dissolubility Ri.
5. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 2, the straightway that pressure build-up curve is also referred to as He Nuo extends toIntersecting, the corresponding pressure of intersection point
Power is oil well place stratum static pressure Px, wherein, tpFor the oil well constant rate of production production time, △ t is the closed-in time.
6. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 3, when monitoring production gas-oil ratio Rx, after crude oil is flowed out by well head, crude oil separates with solution gas, leads to
Excessively stream gauge measures the solution gas gas volume of daily abjection and the crude oil volume produced in oil tank, and ratio between two is daily
Production gas-oil ratio Rx.
7. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 3, when monitoring well head carbon dioxide content Cx, take the solution gas sample volume of abjection by sampler
Vx, is detected to sample using gas chromatograph in laboratory, the CO detecting2Volume content Vcx, well head carbon dioxide contains
Amount Cx=Vcx/Vx.
8. under the conditions of carbon dioxide mixed phase according to claim 1 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, in step 4, it is not to be subject to the effect stage that oil well is subject to effect divided stages, is driven section, mixed phase section stage, nearly gas by effect elasticity
Alter stage and has channeling stage.
9. under the conditions of carbon dioxide mixed phase according to claim 8 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, be not subject to the effect stage not to be subject to CO for oil well2Drive impact and be still within pure elasticity drive state, Cx≈Ci, Rx≈Rt, produce gas and oil
It is all stable than Rx and well head carbon dioxide content Cx two parametric characteristics, yield shows as elasticity and successively decreases.
10. under the conditions of carbon dioxide mixed phase according to claim 8 drives, oil well is subject to effect divided stages and method of discrimination, and it is special
Levy and be, being driven section by effect elasticity is that oil well has been subject to CO2Drive impact, show as energy and recover, gas displacement front not yet reaches shaft bottom；Cx
≈Ci, Rx≈Rt, production gas-oil ratio Rx and well head carbon dioxide content Cx two parametric characteristics are all stable, and yield shows as successively decreasing
Slow down or start occur surely increasing section.
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