CN109614736A - A kind of determination method of the exploitation of offshore viscous oil field steam soak directional well and straight well production capacity multiple - Google Patents
A kind of determination method of the exploitation of offshore viscous oil field steam soak directional well and straight well production capacity multiple Download PDFInfo
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Abstract
The invention discloses a kind of determination methods of offshore viscous oil field steam soak exploitation directional well and straight well production capacity multiple, include the following steps: the geological reservoir parameter for measuring offshore viscous oil field, the directional well pseudoskin factor and steam soak established under the conditions of offshore viscous oil field steam soak exploitation straight well productivity prediction model, different hole angle according to geology oil deposit parameter develop directional well productivity prediction model under the conditions of different hole angles；According to obtained straight well productivity prediction model and directional well productivity prediction model, offshore viscous oil field steam soak exploitation directional well and straight well production capacity times exponential model are established.The present invention provides a kind of offshore viscous oil field steam soak exploitation directional wells and straight well production capacity multiple to determine method, and the orientation well capacity that different hole angles can be developed for Offshore Heavy Oil Field steam soak provides foundation.The present invention gives quantification, operable technical method and implementation steps, the method for the present invention is suitable for offshore viscous oil field steam soak and orients well development.
Description
Technical field
The present invention relates to a kind of offshore viscous oil field steam soak production capacities to determine method, and in particular to a kind of Offshore Heavy Oil Field oil
The determination method of field steam soak exploitation directional well and straight well production capacity multiple.
Background technique
Heavy oil reserves are huge, for viscosity be greater than 350mPas special viscous crude, it is cold adopt production capacity is low, recovery ratio is low,
Deficiency in economic performance.Oil recovery by heating is to improve the effective means of special heavy crude reservoir well yield and recovery ratio, in the Chinese Liaohe River, newly
The onshore oil fields Simulation on whole pay zones such as boundary, triumph, Henan achieves significant economic and social benefit.Effectively to employ this part spy
Different heavy oil reserves, offshore oilfield has carried out the thermal recovery pilot test that multielement hot fluid is handled up with steam soak in the Bohai Sea at present, compared with
Conventional water drive, development effectiveness are obvious.
Since offshore oilfield platform space is limited, for stratified reservoir, platform well drilling is in the majority with directional well, different location well
Oblique angle is different, as shown in Figure 1.Offshore Heavy Oil Field steam soak is developed, the orientation well capacity under the conditions of different hole angles is really
It surely is the important parameter of Accurate Prediction heavy crude heat extraction development index and the key of oilfield development program establishment.
Predict Production for Cyclic Steam Injection is studied at present, is concentrated mainly in straight well and horizontal well both well type, and it is right
It is less in the directional well Predict Production for Cyclic Steam Injection research of different hole angles, also not to the phase of directional well and straight well production capacity multiple
Close research.
Summary of the invention
It handles up the orientation under the conditions of developing different hole angles the object of the present invention is to provide a kind of Offshore Heavy Oil Field Reservoir With Steam
Well and straight well production capacity multiple determine method, and the method for the present invention is it can be considered that different hole angles, different well spacings and different heating radius
Influence to production capacity multiple；The method of the present invention strong operability, accuracy are high, can instruct marine multilayer factor of cyclic steam stimulation in heavy oil reservoir
The orientation well capacity for developing different hole angles determines.
The determination method of the exploitation of offshore viscous oil field steam soak directional well and straight well production capacity multiple provided by the present invention,
Include the following steps:
(1) the geological reservoir parameter for measuring offshore viscous oil field establishes Offshore Heavy Oil Field oil according to the geological reservoir parameter
Directional well pseudoskin factor and steam soak under the conditions of field steam soak exploitation straight well productivity prediction model, different hole angles are opened
Directional well productivity prediction model under the conditions of sending out hole angle different；
(2) the straight well productivity prediction model and the directional well productivity prediction model obtained according to step (1), is established
Offshore viscous oil field steam soak develops directional well and straight well production capacity times exponential model.
In the determination method, in step (1), the geological reservoir parameter includes formation absolute permeability, stratum original
Oily relative permeability, oil reservoir horizontal permeability, oil reservoir vertical permeability, core intersection, inclined shaft well bore length, hot-zone are averaged stratum
Viscosity of crude, hot-zone heating radius, wellbore radius, directional well damage district skin, cold-zone oil viscosity and drainage radius.
In the determination method, in step (1), steam soak develops the foundation of straight well productivity prediction model, considers to steam
Vapour handle up heavy crude reservoir be hot-zone and the cold compound coupling oil reservoir adopted, and consider it is assumed hereinafter that:
(1) hot-zone and cold-zone are Isothermal Model, and hot-zone is isothermal region, and cold-zone is original reservoir temperature；
(2) single-phase, steady flow；
(3) inclined shaft Reservoir Section is all penetrated out；
(4) longitudinal temperature distribution is equal；
It is conventional to develop straight well Productivity Formulae according to Darcy formula:
According to equivalent flow resistance method, the steam soak straight well productivity model of hot-zone and cold-zone Composite Reservoir is determined:
In formula (1), JvhIndicate that steam soak develops straight well production capacity, m3/(d·MPa)；QvhIndicate that steam soak develops straight well
Yield, m3/d；Δ P indicates producing pressure differential, MPa；K indicates formation absolute permeability, mD；KroIt indicates that in-place oil is opposite to permeate
Rate, mD；H indicates core intersection, m；uhIndicate that hot-zone is averaged oil viscosity, mPas；RehIndicate hot-zone heating radius, m；
RwIndicate wellbore radius, m；S indicates directional well damage district skin；ucIndicate cold-zone oil viscosity, mPas；ReIt indicates
Drainage radius, m.
In the determination method, in step (1), shown in the directional well pseudoskin factor such as formula (2):
In formula (2),
θ indicates hole angle, °；H indicates core intersection, m；L indicates inclined shaft well bore length, m；KhIndicate oil reservoir horizontal permeation
Rate, mD；KvIndicate oil reservoir vertical permeability, mD；RwIndicate wellbore radius, m.
In the determination method, in step (1), the steam soak exploitation orientation well capacity of different hole deviation corner conditions is considered
Prediction model are as follows:
According to equivalent flow resistance method, the Composite Reservoir directional well steam soak productivity model of hot-zone and cold-zone is established are as follows:
In formula, JdθhIndicate steam soak exploitation orientation well capacity, m3/(d·MPa)；QdθhIndicate steam soak directional well
Yield, m3/ d, Δ P indicate producing pressure differential, MPa；K indicates formation absolute permeability, mD；KroIt indicates that in-place oil is opposite to permeate
Rate, mD；H indicates core intersection, m；ucIndicate cold-zone oil viscosity, mPas；ReIndicate drainage radius, m；RwIndicate well
Cylinder radius, m；SθIndicate that directional well pseudoskin factor, S indicate directional well damage district skin.
In the determination method, in step (2), shown steam soak exploitation directional well and straight well production capacity times exponential model can
Straight well productivity prediction model is developed by steam soak and directional well productivity prediction model obtains.It is assumed that damage district skin S is 0,
Oil reservoir absolute permeability K and oil relative permeability KroIt is constant, then straight well and orientation are developed according to steam soak obtained above
(formula (1) and formula (3), foundation obtains steam soak exploitation directional well and straight well production capacity times exponential model to well capacity prediction model, such as formula
(4) shown in:
In formula (4), uhIndicate that hot-zone is averaged oil viscosity, mPas；ucIndicate cold-zone oil viscosity, mPa
s；RehIndicate hot-zone heating radius, m；RwIndicate wellbore radius, m；ReIndicate drainage radius, m；SθIndicate directional well intend epidermis because
Son.
The offshore viscous oil field steam soak exploitation directional well and straight well production capacity times exponential model provided according to the present invention, in conjunction with
Following step can determine that offshore viscous oil field steam soak exploitation orientation well capacity:
1) changed according to the viscosity of crude of different radial distances, establish average viscosity of crude in the hot-zone of different heating radius
With the relational model between different heating radius；
2) directional well and straight well production capacity times exponential model obtained according to the method for the present invention, adds in conjunction with the difference that step 1) obtains
Average viscosity of crude, wellbore radius, drainage radius, cold-zone oil viscosity and the directional well are quasi- in hot-zone under thermal radius
Skin factor obtains steam soak exploitation directional well and straight well capacity multiple；According to offshore oilfield test, determining steam is gulped down
It spits exploitation straight well production capacity and orients well capacity to get to the exploitation of offshore viscous oil field steam soak.
In step 1), shown in the relational model such as formula (5):
In formula (5), uhIndicate that hot-zone is averaged oil viscosity, mPas；RehIndicate hot-zone heating radius, m；RwIt indicates
Wellbore radius, m；X is indicated apart from pit shaft any distance, m.
The present invention provides a kind of offshore viscous oil field steam soak exploitation directional wells and straight well production capacity multiple to determine method,
The orientation well capacity that different hole angles can be developed for Offshore Heavy Oil Field steam soak provides foundation.The present invention gives quantification,
Operable technical method and implementation steps, the method for the present invention are suitable for offshore viscous oil field steam soak and orient well development.
Detailed description of the invention
Fig. 1 is marine orientation well development schematic diagram.
Fig. 2 adopts Composite Reservoir model with cold for steam soak hot-zone.
Fig. 3 is steam soak directional well model schematic.
Fig. 4 be thermal recovery handle up well boil in a covered pot over a slow fire well last moment oil viscosity distribution map.
Fig. 5 is directional well and straight well production capacity multiple with hole angle change curve.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
Offshore viscous oil field steam soak develops the foundation of straight well productivity prediction model, considers that steam soak heavy crude reservoir is
Hot-zone and the cold compound coupling oil reservoir adopted, and consider it is assumed hereinafter that:
(1) hot-zone and cold-zone are Isothermal Model, and hot-zone is isothermal region, and cold-zone is original reservoir temperature；
(2) single-phase, steady flow；
(3) inclined shaft Reservoir Section is all penetrated out；
(4) longitudinal temperature distribution is equal.
Steam soak develop straight well model as shown in Fig. 2,
It is conventional to develop straight well Productivity Formulae according to Darcy formula:
Wherein, K indicates formation absolute permeability, mD；KroIndicate in-place oil relative permeability, mD；H indicates that oil reservoir is thick
Degree, m；JvIndicate conventional straight well production capacity, m3/(d·MPa)；QvIndicate conventional straight well yield, m3/d；Δ P indicates producing pressure differential,
MPa；ucIndicate cold-zone oil viscosity, mPas；S indicates directional well damage district skin.
According to equivalent flow resistance method, the steam soak straight well productivity model of hot-zone and cold-zone Composite Reservoir is determined:
In formula (1), JvhIndicate that steam soak develops straight well production capacity, m3/(d·MPa)；QvhIndicate that steam soak develops straight well
Yield, m3/d；Δ P indicates producing pressure differential, MPa；K indicates formation absolute permeability, mD；KroIt indicates that in-place oil is opposite to permeate
Rate, mD；H indicates core intersection, m；uhIndicate that hot-zone is averaged oil viscosity, mPas；RehIndicate hot-zone heating radius, m；
RwIndicate wellbore radius, m；S indicates directional well damage district skin；ucIndicate cold-zone oil viscosity, mPas；ReIt indicates
Drainage radius, m.
Steam soak directional well schematic diagram as shown in figure 3, wherein θ indicate hole angle, °；H indicates core intersection, m；L is indicated
Inclined shaft well bore length, m.
Directional well pseudoskin factor S under the conditions of different hole anglesθIt may be expressed as:
In formula (2),
θ indicates hole angle, °；H indicates core intersection, m；L indicates inclined shaft well bore length, m；KhIndicate oil reservoir horizontal permeation
Rate, mD；KvIndicate oil reservoir vertical permeability, mD；RwIndicate wellbore radius, m.
The steam soak of different hole deviation corner conditions develops productivity prediction model are as follows:
Wherein, JdθIndicate that steam soak orients well capacity, m3/(d·MPa)；QdθIndicate that steam soak orients well production,
m3/d。
According to equivalent flow resistance method, the Composite Reservoir directional well steam soak productivity model of hot-zone and cold-zone is established are as follows:
It is assumed that damage district skin S is 0, oil reservoir absolute permeability K and oil relative permeability KroIt is constant, then according to above-mentioned
Obtained steam soak exploitation straight well and directional well productivity prediction model, establishes steam soak exploitation directional well and straight well production capacity times
Exponential model:
According to reservoir numerical simulation, the function u that hot-zone viscosity of crude changes with radial distance is determinedh(x) it establishes different
Average viscosity of crude u in the hot-zone of heating radiushWith different heating radius RehRelational model:
uhIndicate that hot-zone is averaged oil viscosity, mPas；RehIndicate hot-zone heating radius, m；RwIndicate pit shaft half
Diameter, m.
By taking the heavy crude reservoir of the Bohai Sea as an example, oil reservoir average pore is 28.5%, mean permeability 668mD, Zong Xiangduo
Oil-water system is covered, is bedded structure side water heavy crude oil reservoir, crude oil density in stock tank 0.972t/m3, oil viscosity calculating
For 472mPas, the function u that hot-zone viscosity of crude changes with radial distance is determined by reservoir numerical simulationh(x), such as Fig. 4
It is shown.
By to uh(x) it in difference away from integral weighting within the scope of well, solves hot-zone and be averaged viscosity of crude, add in the present embodiment
Thermal radius 20m, hot-zone are averaged oil reservoir viscosity as 17.2mPas.
By different heating radius R obtained aboveehUnder hot-zone in average viscosity of crude uh, and by wellbore radius Rw、
Drainage radius Re, cold-zone oil viscosity uc, inclined shaft pseudoskin factor SθBring steam soak exploitation directional well and straight well production capacity into
Times exponential model (formula (4)) solves steam soak exploitation directional well and straight well production capacity multiple
By taking the heating radius 20m of hot-zone as an example, when well spacing is 200m, it may be determined that directional well under the conditions of different hole angles with
Straight well steam soak production capacity times number curve, as shown in Figure 5.
In view of offshore platform well number is more, and when hole angle is smaller, directional well and straight well steam soak production capacity multiple
Variation is relatively slow, therefore determines there is operability to make to orient well capacity, according to hole angle size, classifies and determines that steam soak is opened
It sends out directional well and straight well production capacity multiple and orients well capacity, specific classification is as shown in table 1.
By taking the heavy crude reservoir of the Bohai Sea as an example, being tested by sea and determining that steam soak orients well capacity is 40m3/d。
The different hole angle steam soak thermal recovery production capacity multiples of table 1
Claims (6)
1. a kind of determination method of the exploitation of offshore viscous oil field steam soak directional well and straight well production capacity multiple, including walk as follows
It is rapid:
(1) the geological reservoir parameter for measuring offshore viscous oil field is established offshore viscous oil field according to the geological reservoir parameter and is steamed
Vapour handles up the directional well pseudoskin factor under the conditions of developing straight well productivity prediction model, different hole angle and steam soak exploitation not
With directional well productivity prediction model under the conditions of hole angle；
(2) the straight well productivity prediction model and the directional well productivity prediction model obtained according to step (1) is established marine
Viscous crude field steam soak develops directional well and straight well production capacity times exponential model.
2. determining method according to claim 1, it is characterised in that: in step (1), the geological reservoir parameter includes ground
Layer absolute permeability, in-place oil relative permeability, oil reservoir horizontal permeability, oil reservoir vertical permeability, core intersection, inclined shaft well
Body length, hot-zone are averaged oil viscosity, hot-zone heating radius, wellbore radius, directional well damage district skin, cold-zone stratum
Viscosity of crude and drainage radius.
3. determining method according to claim 2, it is characterised in that: shown in the straight well productivity prediction model such as formula (1):
In formula (1), JvhIndicate that steam soak develops straight well production capacity, m3/(d·MPa)；K indicates formation absolute permeability, mD；Kro
Indicate in-place oil relative permeability, mD；H indicates core intersection, m；uhIndicate that hot-zone is averaged oil viscosity, mPas；
RehIndicate hot-zone heating radius, m；RwIndicate wellbore radius, m；S indicates directional well damage district skin；ucIndicate cold-zone stratum
Viscosity of crude, mPas；ReIndicate drainage radius, m.
4. determining method according to claim 2 or 3, it is characterised in that: in step (1), the directional well intend epidermis because
Shown in son such as formula (2):
In formula (2),
θ indicates hole angle, °；H indicates core intersection, m；L indicates inclined shaft well bore length, m；KhIndicate oil reservoir horizontal permeability, mD；
KvIndicate oil reservoir vertical permeability, mD；RwIndicate wellbore radius, m.
5. the determination method according to any one of claim 2-4, it is characterised in that: in step (1), the directional well is produced
Shown in energy prediction model such as formula (3):
In formula (3), JdθhIndicate steam soak exploitation orientation well capacity, m3/(d·MPa)；K indicates formation absolute permeability, mD；
KroIndicate in-place oil relative permeability, mD；H indicates core intersection, m；uhIndicate that hot-zone is averaged oil viscosity, mPa
s；RehIndicate hot-zone heating radius, m；RwIndicate wellbore radius, m；SθIndicate directional well pseudoskin factor；S indicates that directional well is dirty
Contaminate skin factor；ucIndicate cold-zone oil viscosity, mPas；ReIndicate drainage radius, m.
6. the determination method according to any one of claim 2-5, it is characterised in that: in step (2), the steam soak
It develops shown in directional well and straight well production capacity times exponential model such as formula (4):
In formula (4), uhIndicate that hot-zone is averaged oil viscosity, mPas；ucIndicate cold-zone oil viscosity, mPas；Reh
Indicate hot-zone heating radius, m；RwIndicate wellbore radius, m；ReIndicate drainage radius, m；SθIndicate directional well pseudoskin factor.
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| CN111485863A (en) * | 2020-04-16 | 2020-08-04 | 北京默凯斯能源技术有限公司 | Method for calculating capacity multiple of steam huff-puff well of heavy oil field |
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| CN115405273A (en) * | 2021-05-27 | 2022-11-29 | 中国石油天然气股份有限公司 | Integrated learning-based thickened oil multi-medium huff-and-puff intelligent mining method and device |
| CN115405273B (en) * | 2021-05-27 | 2023-07-25 | 中国石油天然气股份有限公司 | Thickened oil multi-medium throughput intelligent mining method and device based on ensemble learning |
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