CN110067546A - The method of discrimination of oil well channeling in steam-drive process - Google Patents
The method of discrimination of oil well channeling in steam-drive process Download PDFInfo
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- CN110067546A CN110067546A CN201910298502.XA CN201910298502A CN110067546A CN 110067546 A CN110067546 A CN 110067546A CN 201910298502 A CN201910298502 A CN 201910298502A CN 110067546 A CN110067546 A CN 110067546A
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- 239000003129 oil well Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000005465 channeling Effects 0.000 title claims abstract description 42
- 238000010795 Steam Flooding Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000011017 operating method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 21
- 238000011084 recovery Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
Classifications
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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
-
- 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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention provides a kind of method of discrimination of oil well channeling in steam-drive process, and the method for discrimination of oil well channeling includes: step 1 in the steam-drive process, collects oilwell parameter；Step 2, bottom pressure P is calculated using well depth, hydrodynamic face, aqueous, water density and oil densitywf；Step 3, bottom hole temperature (BHT) T is calculated using the total thermal coefficient for arriving cement sheath outer wall in oilwell produced fluid amount, moisture content, wellhead temperature, temperature gradient, the specific heat capacity of oil well liquid-producing, pit shaftb；Step 4, differentiate whether oil well shaft bottom occurs channeling using the bottom pressure and bottom hole temperature (BHT) of calculating according to the corresponding relationship of the saturation temperature of steam and saturation pressure.The method of discrimination of oil well channeling is intimately associated production reality, overcomes subjectivity in the steam-drive process, and science is remarkably reinforced, and operating procedure is clear, so that more scientific and reasonable instructs steam drive development and live dynamic regulation.
Description
Technical field
The present invention relates to oil field development technical field, a kind of differentiation of oil well channeling in steam-drive process is especially related to
Method.
Background technique
Steam drives the effective technology method that recovery ratio is improved as heavy crude reservoir, is that high temperature steaming is persistently injected into injection well
Vapour, steam heat underground crude oil, to reduce viscosity of crude and be driven onto neighbouring more mouthfuls of oil wells, continue to produce from oil well by crude oil
Oil production method.The main function mechanism that heating, viscosity reducing drives as steam determines that steam drive development technology will base oneself upon high temperature and adopt
Oil.
But there is steam to emerge often through well mouth of oil well at present, that is, be judged as that channeling occurs for oil well, to select closing well etc.
The measure of channeling is administered, to seriously affect the development effectiveness and final recovery ratio of steam drive.In fact, well mouth of oil well has
Steam is emerged, and most of situation is after hot water reaches well head, due to the flass that pressure declines and occurs, and non-real meaning
The steam of injection well in justice directly channels to oil well, therefore the illusion that cannot be had steam to emerge by well head confuses, and one sees steaming
Vapour flashes off from well head and just takes closing well measure, then how the real oil well channeling of correct decision.Thus we have invented
The method of discrimination of oil well channeling, solves the above technical problem in a kind of new steam-drive process.
Summary of the invention
Realize whether oil well shaft bottom in steam-drive process occurs the conjunction of real channeling the object of the present invention is to provide a kind of
Manage the method for discrimination of oil well channeling in the steam-drive process differentiated.
The purpose of the present invention can be achieved by the following technical measures: the method for discrimination of oil well channeling in steam-drive process,
The method of discrimination of oil well channeling includes: step 1 in the steam-drive process, collects oilwell parameter；Step 2, well depth, hydrodynamic are utilized
Face, aqueous, water density and oil density calculate bottom pressure Pwf；Step 3, using oilwell produced fluid amount, moisture content, wellhead temperature,
Temperature gradient, the specific heat capacity of oil well liquid-producing to total thermal coefficient of cement sheath outer wall calculate bottom hole temperature (BHT) T in pit shaftb；Step 4,
Oil well is differentiated using the bottom pressure and bottom hole temperature (BHT) of calculating according to the corresponding relationship of the saturation temperature of steam and saturation pressure
Whether shaft bottom occurs channeling.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, the oilwell parameter of collection includes: bottom depth l, dynamic oil level lf, moisture content fw, water density ρw、
Oil density ρo, oilwell produced fluid amount Ql, wellhead temperature Twh, temperature gradient m, oil well liquid-producing specific heat capacity Cl, pit shaft is interior to arrive cement sheath
Total thermal coefficient λ of outer wall.
In step 2, the calculation formula of bottom pressure are as follows:
Pwf=(l-lf)×(ρw×fw+ρo×(1-fw))×g/1000
PwfFor bottom pressure, KPa；
L is bottom depth, m；
lfFor dynamic oil level, m；
ρwFor water density, kg/m3；
ρoFor oil density, kg/m3；
fwFor moisture content, decimal；
G is acceleration of gravity, 9.8m/s2。
In step 3, the calculation formula of bottom hole temperature (BHT) are as follows:
TbFor bottom hole temperature (BHT), DEG C；
TwhFor wellhead temperature, DEG C；
M is temperature gradient, DEG C/m；
L is bottom depth, m；
W is water equivalent, J/ (s DEG C)；
λ is total thermal coefficient that cement sheath outer wall is arrived in pit shaft, W/ (m DEG C)；
The calculation formula of water equivalent W are as follows:
W=QlCl
QlFor oilwell produced fluid amount, kg/s；
ClFor the specific heat capacity of oil well liquid-producing, J/ (kg DEG C)；
Total thermal coefficient in pit shaft to cement sheath outer wall be consideration pit shaft inner oil tube thermal resistance, oil pipe and casing between annular space
The outer cement sheath thermal resistance of thermal resistance, casing thermal resistance and casing.
In step 4, the corresponding relationship of the saturation temperature of steam and saturation pressure are as follows:
TsFor saturation temperature, DEG C；
PsFor saturation pressure, KPa.
In step 4, the bottom hole temperature (BHT) of calculating is lower than vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then channeling does not occur for oil well shaft bottom；
The bottom hole temperature (BHT) of calculating is more than or equal to vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then channeling occurs for oil well shaft bottom.
The method of discrimination of oil well channeling in steam-drive process in the present invention, by calculating bottom hole temperature (BHT) and bottom pressure,
According to the corresponding relationship of the saturation temperature of steam and saturation pressure, realize whether oil well shaft bottom in steam-drive process occurs really
The reasonable differentiation of channeling.With it is previous whether there is method of the steam to differentiate channeling with well mouth of oil well compared with, new method is close
In conjunction with production reality, overcome subjectivity, science is remarkably reinforced, and operating procedure is clear, thus more scientific and reasonable guidance
Steam drive development and live dynamic regulation.
Detailed description of the invention
Fig. 1 is the flow chart of a specific embodiment of the method for discrimination of oil well channeling in steam-drive process of the invention；
Fig. 2 is middle oil well 24P530 production curve figure in a specific embodiment of the invention.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the structure charts of the method for discrimination of oil well channeling in steam-drive process of the invention.
Step 101, bottom depth l, the dynamic oil level l of oil well are collectedf, moisture content fw, water density ρw, oil density ρo、
Oilwell produced fluid amount Ql, wellhead temperature Twh, temperature gradient m, oil well liquid-producing specific heat capacity Cl, interior always the leading to cement sheath outer wall of pit shaft
Hot coefficient lambda；
Step 102, bottom pressure P is calculated using well depth, hydrodynamic face, aqueous, water density and oil densitywf；Bottom pressure
Calculation formula are as follows:
Pwf=(l-lf)×(ρw×fw+ρo×(1-fw))×g/1000
PwfFor bottom pressure, KPa；
L is bottom depth, m；
lfFor dynamic oil level, m；
ρwFor water density, kg/m3；
ρoFor oil density, kg/m3；
fwFor moisture content, decimal；
G is acceleration of gravity, 9.8m/s2。
Step 103, oilwell produced fluid amount, moisture content, wellhead temperature, temperature gradient, the specific heat capacity of oil well liquid-producing, pit shaft are utilized
Interior total thermal coefficient to cement sheath outer wall calculates bottom hole temperature (BHT) Tb；The calculation formula of bottom hole temperature (BHT) are as follows:
TbFor bottom hole temperature (BHT), DEG C；
TwhFor wellhead temperature, DEG C；
M is temperature gradient, DEG C/m；
L is bottom depth, m；
W is water equivalent, J/ (s DEG C)；
λ is total thermal coefficient that cement sheath outer wall is arrived in pit shaft, W/ (m DEG C)；
The calculation formula of water equivalent W are as follows:
W=QlCl
QlFor oilwell produced fluid amount, kg/s；
ClFor the specific heat capacity of oil well liquid-producing, J/ (kg DEG C)；
Total thermal coefficient in pit shaft to cement sheath outer wall be consideration pit shaft inner oil tube thermal resistance, oil pipe and casing between annular space
The outer cement sheath thermal resistance of thermal resistance, casing thermal resistance and casing.
Step 104, according to the corresponding relationship of the saturation temperature of steam and saturation pressure, the bottom pressure and well of calculating are utilized
Bottom temperature, differentiates whether oil well shaft bottom occurs channeling.
The saturation temperature of steam and the corresponding relationship of saturation pressure are as follows:
Ts=35.6784Ps 0.235
TsFor saturation temperature, DEG C；
PsFor saturation pressure, KPa；
The bottom hole temperature (BHT) of calculating is lower than vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then channeling does not occur for oil well shaft bottom.
The bottom hole temperature (BHT) of calculating is more than or equal to vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then channeling occurs for oil well shaft bottom.
In an application specific embodiment of the invention, choose in Gudao area of Shengli Oilfield oil recovery factory in two northern steam flooding well groups
Oil well 24P530, using the method for discrimination of oil well channeling in the invention steam-drive process, to the oil well in December, 2012 whether
Channeling is differentiated.As shown in Fig. 2, the well in December, 2012 wellhead temperature reaches 106 DEG C, there is steam phenomenon in well head.
Step 1:
Collect bottom depth 1320m, dynamic oil level 854m, the moisture content 0.905, water density of oil well 24P530
1000kg/m3, oil density 965kg/m3, oilwell produced fluid amount 0.9155kg/s, 106 DEG C of wellhead temperature, 0.035 DEG C of temperature gradient/
M, 3990 J/ of specific heat capacity (kg DEG C) of oil well liquid-producing, the interior total thermal coefficient 1.25W/ (m for arriving cement sheath outer wall of pit shaft
℃)；
Step 2:
Bottom pressure P is calculated using well depth, hydrodynamic face, aqueous, water density and oil densitywf:
Pwf=(l-lf)×(ρw×fw+ρo×(1-fw)) × g/1000=4551.615 Pa
Step 3:
Using in oilwell produced fluid amount, moisture content, wellhead temperature, temperature gradient, the specific heat capacity of oil well liquid-producing, pit shaft arrive cement
Total thermal coefficient of ring outer wall calculates bottom hole temperature (BHT) Tb；
Step 4: bottom pressure and shaft bottom according to the corresponding relationship of the saturation temperature of steam and saturation pressure, using calculating
Temperature, differentiates whether oil well shaft bottom occurs channeling.
The saturation temperature of steam and the corresponding relationship of saturation pressure are as follows:
TsFor saturation temperature, DEG C；
PsFor saturation pressure, KPa；
Calculate vapo(u)rous temperature T corresponding under the bottom pressures=35.6784 × 4551.6150.235=258.27
DEG C,
By Tb=210.6 < Ts=258.27, then determine that in December, 2012 channeling does not occur for oil well 24P530.
The method of discrimination of oil well channeling in the steam-drive process, by calculating bottom hole temperature (BHT) and bottom pressure, according to steam
Saturation temperature and saturation pressure corresponding relationship, realize whether oil well shaft bottom in steam-drive process occurs the conjunction of real channeling
Reason differentiates that this method is intimately associated production reality, overcomes subjectivity, and science is remarkably reinforced, and operating procedure clear and rational, has
Effect instructs steam drive development and live dynamic regulation.
Claims (6)
1. the method for discrimination of oil well channeling in steam-drive process, which is characterized in that the differentiation of oil well channeling in the steam-drive process
Method includes:
Step 1, oilwell parameter is collected；
Step 2, bottom pressure P is calculated using well depth, hydrodynamic face, aqueous, water density and oil densitywf；
Step 3, using in oilwell produced fluid amount, moisture content, wellhead temperature, temperature gradient, the specific heat capacity of oil well liquid-producing, pit shaft arrive water
Total thermal coefficient of mud ring outer wall calculates bottom hole temperature (BHT) Tb；
Step 4, according to the corresponding relationship of the saturation temperature of steam and saturation pressure, the bottom pressure and shaft bottom temperature of calculating are utilized
Degree, differentiates whether oil well shaft bottom occurs channeling.
2. the method for discrimination of oil well channeling in steam-drive process according to claim 1, which is characterized in that in step 1,
The oilwell parameter of collection includes: bottom depth l, dynamic oil level lf, moisture content fw, water density ρw, oil density ρo, oil well produce
Liquid measure Ql, wellhead temperature Twh, temperature gradient m, oil well liquid-producing specific heat capacity Cl, the interior total thermal coefficient for arriving cement sheath outer wall of pit shaft
λ。
3. the method for discrimination of oil well channeling in steam-drive process according to claim 1, which is characterized in that in step 2,
The calculation formula of bottom pressure are as follows:
Pwf=(l-lf)×(ρw×fw+ρo×(1-fw))×g/1000
PwfFor bottom pressure, KPa；
L is bottom depth, m；
lfFor dynamic oil level, m；
ρ w is water density, kg/m3；
ρoFor oil density, kg/m3；
fwFor moisture content, decimal；
G is acceleration of gravity, 9.8m/s2。
4. the method for discrimination of oil well channeling in steam-drive process according to claim 1, which is characterized in that in step 3,
The calculation formula of bottom hole temperature (BHT) are as follows:
TbFor bottom hole temperature (BHT), DEG C；
TwhFor wellhead temperature, DEG C；
M is temperature gradient, DEG C/m；
L is bottom depth, m；
W is water equivalent, J/ (s DEG C)；
λ is total thermal coefficient that cement sheath outer wall is arrived in pit shaft, W/ (m DEG C)；
The calculation formula of water equivalent W are as follows:
W=QlCl
QlFor oilwell produced fluid amount, kg/s；
ClFor the specific heat capacity of oil well liquid-producing, J/ (kg DEG C)；
Total thermal coefficient in pit shaft to cement sheath outer wall is that annular space is warm between the thermal resistance for considering pit shaft inner oil tube, oil pipe and casing
The outer cement sheath thermal resistance of resistance, casing thermal resistance and casing.
5. the method for discrimination of oil well channeling in steam-drive process according to claim 1, which is characterized in that in step 4,
The saturation temperature of steam and the corresponding relationship of saturation pressure are as follows:
TsFor saturation temperature, DEG C；
PsFor saturation pressure, KPa.
6. the method for discrimination of oil well channeling in steam-drive process according to claim 5, which is characterized in that in step 4,
The bottom hole temperature (BHT) of calculating is lower than vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then oil well
Channeling does not occur for shaft bottom；
The bottom hole temperature (BHT) of calculating is more than or equal to vapo(u)rous temperature corresponding under the bottom pressure, i.e.,Then channeling occurs for oil well shaft bottom.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720116A (en) * | 2020-05-14 | 2020-09-29 | 中国石油化工股份有限公司 | Fracture-cavity type oil reservoir unit nitrogen gas flooding gas channeling judgment method and injection-production channeling prevention method |
| CN114198073A (en) * | 2020-08-31 | 2022-03-18 | 中国石油化工股份有限公司 | Method for improving recovery efficiency of steam huff and puff steam channeling horizontal well |
| CN114893172A (en) * | 2022-05-26 | 2022-08-12 | 常州大学 | Method and system for simulating thickened oil thermal fluid displacement |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720116A (en) * | 2020-05-14 | 2020-09-29 | 中国石油化工股份有限公司 | Fracture-cavity type oil reservoir unit nitrogen gas flooding gas channeling judgment method and injection-production channeling prevention method |
| CN111720116B (en) * | 2020-05-14 | 2021-09-14 | 中国石油化工股份有限公司 | Fracture-cavity type oil reservoir unit nitrogen gas flooding gas channeling judgment method and injection-production channeling prevention method |
| CN114198073A (en) * | 2020-08-31 | 2022-03-18 | 中国石油化工股份有限公司 | Method for improving recovery efficiency of steam huff and puff steam channeling horizontal well |
| CN114893172A (en) * | 2022-05-26 | 2022-08-12 | 常州大学 | Method and system for simulating thickened oil thermal fluid displacement |
| CN114893172B (en) * | 2022-05-26 | 2023-08-08 | 常州大学 | Method and system for simulating heavy oil thermal fluid displacement |
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