CN109667564A - A kind of determination method of offshore viscous oil field steam soak exploitation orientation well capacity - Google Patents
A kind of determination method of offshore viscous oil field steam soak exploitation orientation well capacity Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 230000035699 permeability Effects 0.000 claims description 19
- 210000003491 skin Anatomy 0.000 claims description 7
- 210000002615 epidermis Anatomy 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 45
- 239000000295 fuel oil Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
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- YBJHBAHKTGYVGT-ZKWXMUAHSA-N (+)-Biotin Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)O)SC[C@@H]21 YBJHBAHKTGYVGT-ZKWXMUAHSA-N 0.000 description 1
- 238000010794 Cyclic Steam Stimulation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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Abstract
The invention discloses a kind of determination methods that offshore viscous oil field steam soak develops orientation well capacity, include the following steps: the geological reservoir parameter for measuring offshore viscous oil field, directional well pseudoskin factor under the conditions of offshore viscous oil field difference hole angle and steam soak exploitation directional well and straight well production capacity times exponential model are established according to geology oil deposit parameter；Changed according to the viscosity of crude of different radial distances, establishes the relational model in the hot-zone of different heating radius between average viscosity of crude and different heating radius；Steam soak exploitation directional well and straight well capacity multiple are obtained in conjunction with the relational model according to obtained directional well and straight well production capacity times exponential model；According to offshore oilfield test, determining steam soak exploitation straight well production capacity develops orientation well capacity to get to offshore viscous oil field steam soak.The method of 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 orientation well capacity.
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.
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 capacity determines method, the method for the present invention it can be considered that different hole angle, different well spacings and different heating radius to steam soak
Orient the influence of well capacity；The method of the present invention strong operability, accuracy are high, can instruct marine multilayer factor of cyclic steam stimulation in heavy oil reservoir
Develop the orientation well capacity design of different hole angles.
The determination method of offshore viscous oil field steam soak exploitation orientation well capacity provided by the present invention, including walk as follows
It is rapid:
1) the geological reservoir parameter for measuring offshore viscous oil field, establishes offshore viscous oil field according to the geological reservoir parameter
Directional well pseudoskin factor and offshore viscous oil field steam soak exploitation directional well and straight well production capacity under the conditions of different hole angles
Times exponential model；
(2) changed according to the viscosity of crude of different radial distances, it is viscous to establish average crude oil in the hot-zone of different heating radius
Relational model between degree and different heating radius；
(3) directional well and straight well production capacity times exponential model obtained according to step (1), the pass obtained in conjunction with step (2)
It is model, obtains steam soak exploitation directional well and straight well capacity multiple；According to the determining steam soak of offshore oilfield test
It develops straight well production capacity and orients well capacity to get to the exploitation of offshore viscous oil field steam soak.
In the determination method, in step (1), shown in the directional well pseudoskin factor such as formula (1):
In formula (1),
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 directional well and straight well production capacity times exponential model are such as
Shown in formula (2):
In formula (2), 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.
Specifically, shown steam soak exploitation directional well and straight well production capacity times exponential model can develop straight well by steam soak and produce
Energy prediction model and directional well productivity prediction model obtain.
Steam soak develops the foundation of straight well productivity prediction model, considers that steam soak heavy crude reservoir is hot-zone and cold adopts
Compound coupling oil reservoir, 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 above formula, JvhIndicate that steam soak develops straight well production capacity, m3/(d·MPa·m)；QvhIndicate that steam soak exploitation is straight
Well production, m3/d；Δ P indicates producing pressure differential；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, mPas；RehIndicate hot-zone heating radius, m；Rw
Indicate wellbore radius, m；S indicates directional well damage district skin；ucIndicate cold-zone oil viscosity, mPas；ReExpression is let out
Oily radius, m.
Consider the steam soak exploitation productivity prediction model of different hole deviation corner conditions 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, JdθIndicate steam soak exploitation orientation well capacity, m3/(d·MPa·m)；Δ P indicates producing pressure differential；K table
Show formation absolute permeability, mD；KroIndicate in-place oil relative permeability, mD；H indicates core intersection, m；ucWith indicating cold-zone
Layer viscosity of crude, mPas；ReIndicate drainage radius, m；RwIndicate wellbore radius, m；SθIndicate directional well pseudoskin factor, S table
Show directional well damage district skin.
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, foundation obtains steam soak exploitation directional well and straight well produces
It can times exponential model.
In the determination method, in step (2), shown in the relational model such as formula (3):
In formula (3), 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；
In step (3), it is viscous that average in-place oil in the hot-zone under different heating radius can be obtained according to the relational model
Degree is developed in directional well and straight well production capacity times exponential model and obtained hot-zone fifty-fifty according to offshore viscous oil field steam soak
Layer viscosity of crude, wellbore radius, drainage radius, cold-zone oil viscosity and directional well pseudoskin factor gulp down to get to steam
Spit exploitation directional well and straight well capacity multiple.
Orientation well capacity is developed the present invention provides a kind of offshore viscous oil field steam soak and determines method, is given quantitative
Change, 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·m)；QvIndicate conventional straight well yield, m3/d；Δ P indicates production pressure
Difference；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 above formula, JvhIndicate that steam soak develops straight well production capacity, m3/(d·MPa·m)；QvhIndicate that steam soak exploitation is straight
Well production, m3/d；Δ P indicates producing pressure differential；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, mPas；RehIndicate hot-zone heating radius, m；Rw
Indicate wellbore radius, m；S indicates directional well damage district skin；ucIndicate cold-zone oil viscosity, mPas；ReExpression is let out
Oily 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 (1),
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·m)；QdθIndicate that steam soak directional well produces
Amount, 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 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 (5)
1. a kind of determination method of offshore viscous oil field steam soak exploitation orientation well capacity, includes the following steps:
(1) the geological reservoir parameter for measuring offshore viscous oil field, establishes offshore viscous oil field not according to the geological reservoir parameter
With the directional well pseudoskin factor and offshore viscous oil field steam soak exploitation directional well and straight well production capacity times under the conditions of hole angle
Exponential model；
(2) changed according to the viscosity of crude of different radial distances, establish in the hot-zone of different heating radius average viscosity of crude with
Relational model between different heating radius；
(3) directional well and straight well production capacity times exponential model obtained according to step (1), the relationship mould obtained in conjunction with step (2)
Type obtains steam soak exploitation directional well and straight well capacity multiple；According to the determining steam soak exploitation of offshore oilfield test
Straight well production capacity orients well capacity to get to the exploitation of offshore viscous oil field steam soak.
2. determining method according to claim 1, it is characterised in that: in step (1), the geological reservoir parameter includes oil
Be averaged oil viscosity, hot-zone of layer horizontal permeability, oil reservoir vertical permeability, core intersection, inclined shaft well bore length, hot-zone adds
Thermal radius, wellbore radius, directional well damage district skin, cold-zone oil viscosity and drainage radius.
3. determining method according to claim 1 or 2, it is characterised in that: in step (1), the directional well intend epidermis because
Shown in son such as formula (1):
In formula (1),
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.
4. determining method according to claim 2 or 3, it is characterised in that: in step (1), the steam soak exploitation is fixed
Shown in Xiang Jingyu straight well production capacity times exponential model such as formula (2):
In formula (2), 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.
5. the determination method according to any one of claim 2-4, it is characterised in that: in step (2), the relational model
As shown in formula (3):
In formula (3), uhIndicate that hot-zone is averaged oil viscosity, mPas；RehIndicate hot-zone heating radius, m；RwIndicate pit shaft
Radius, m；X is indicated apart from pit shaft any distance, m.
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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 |
| CN112508727A (en) * | 2019-08-26 | 2021-03-16 | 中国石油天然气股份有限公司 | Method and system for determining recovery ratio of steam huff-puff heavy oil reservoir |
| CN113669037A (en) * | 2020-05-13 | 2021-11-19 | 中国石油化工股份有限公司 | Step design method for multi-element directional viscosity reduction after multiple times of huffing and puff of thick oil |
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| CN113669037A (en) * | 2020-05-13 | 2021-11-19 | 中国石油化工股份有限公司 | Step design method for multi-element directional viscosity reduction after multiple times of huffing and puff of thick oil |
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