CN107038290A - Method for calculating borehole wall collapse pressure by considering supercharging effect stress - Google Patents
Method for calculating borehole wall collapse pressure by considering supercharging effect stress Download PDFInfo
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- 230000000694 effects Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 64
- 239000011435 rock Substances 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 230000035699 permeability Effects 0.000 claims abstract description 29
- 230000015572 biosynthetic process Effects 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000000205 computational method Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
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- G06F2119/06—Power analysis or power optimisation
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Abstract
The invention discloses a method for calculating borehole wall collapse pressure by considering supercharging effect stress, and belongs to the field of petroleum drilling. The method comprises the steps of obtaining stratum parameters and drilling fluid density from geological data, well logging data and drilling data of a selected area, obtaining mud cake permeability from drilling fluid permeability experiment data of the selected area, obtaining rock mechanics parameters from rock mechanics experiment data and the well logging data of the selected area, obtaining a supercharging effective stress coefficient according to the stratum parameters, the drilling fluid density and the mud cake permeability, substituting the rock mechanics parameters, the stratum parameters and the supercharging effective stress coefficient into a borehole wall collapse pressure model to obtain borehole wall collapse pressure, reflecting borehole wall stress characteristics under a drilling fluid environment more truly, and providing a basis for selecting reasonable drilling fluid density in a drilling process.
Description
Technical field
The present invention relates to field of oil drilling, more particularly to a kind of calculating for the cave-in pressure for considering pressurized effect power
Method.
Background technology
In Process of Oil Well Drilling, to prevent well from collapsing, it is necessary to calculate the drilling fluid of maintenance wellbore stability in pit shaft
Minimum density, i.e. caving pressure.In oil/gas drilling operation, cave-in pressure value is to realize the critical support letter of drilling safety
One of breath, therefore it is very important that cave-in pressure, which is predicted,.
The calculating of existing borehole wall caving pressure is mainly based upon mechanics parameter, pit shaft rock crustal stress and the original of rock in itself
Beginning pore pressure is calculated and gone out.
During the present invention is realized, the inventors discovered that at least there is problems with the prior art：
Existing cave-in calculation of pressure formula does not consider effect of the drilling fluid to rock wall in drilling process, that is, exists
In drilling process, due to drilling fluid filtrate invaded formation, and in borehole wall formation mud cake, the pore pressure liter of near wellbore zone will be made
Height, and then cause to produce additional stress field in borehole wall stratum, nearby stress changes the borehole wall so that existing caving pressure
Calculation formula is difficult to Accurate Prediction and goes out caving pressure.
The content of the invention
In consideration of it, the present invention provides a kind of computational methods for the cave-in pressure for considering pressurized effect power, for more
Calculate exactly and obtain cave-in pressure.
Specifically, including following technical scheme：
A kind of computational methods for the cave-in pressure for considering pressurized effect power, methods described includes：
Formation parameter and drilling fluid density are obtained from the geologic information, well-log information and drilling data of selection area；
Mud cake permeability is obtained from the drilling fluid permeability test data of the selection area；
Rock mechanics parameters are obtained from the Rock Mechanics Test data and the well-log information of the selection area；
According to the formation parameter, the drilling fluid density and the mud cake permeability, pressurized effect force coefficient is obtained；
The rock mechanics parameters, the formation parameter and the pressurized effect force coefficient are updated to cave-in pressure
In model, cave-in pressure is obtained.
Further, the rock mechanics parameters include：Poisson's ratio, rock cohesion, internal friction angle and porosity.
Further, the Rock Mechanics Test is tested for rock triaxial compressions.
Further, the formation parameter includes well depth, pore pressure, effective stress coefficient, minimum crustal stress, maximally
Stress and in-place permeability.
Further, the pressurized effect force coefficient is borehole wall pore pressure and the ratio of pit shaft drilling liquid pressure.
Further, the calculation formula of the pressurized effect force coefficient is：
In formula：η is effective pressurized effect force coefficient；pzFor pit shaft drilling liquid pressure, unit is MPa；pkFor pore pressure,
Unit is MPa；KcFor mud cake permeability, unit is mD；KrFor in-place permeability, unit is mD.
Further, the calculation formula of the pit shaft drilling liquid pressure is：
pz=ρ gh
In formula：ρ is drilling fluid density, and unit is g/cm3；G is gravity coefficient 9.8；H is well depth, and unit is m.
Further, the expression formula of the cave-in pressure model is：
In formula：pzFor cave-in pressure, unit is Mpa；C is rock cohesion, and unit is MPa；φ is internal friction angle,
Unit is degree；σhFor minimum crustal stress, unit is MPa；σHFor maximum crustal stress, unit is MPa；ν is Poisson's ratio；α is to have effect
Force coefficient；For porosity.
The beneficial effect of technical scheme provided in an embodiment of the present invention：
By the geologic information, well-log information, drilling data, drilling fluid permeability test data and the rock that obtain selection area
Experiments of Machanics data, obtains formation parameter, drilling fluid density, mud cake permeability and rock mechanics parameters, according to formation parameter, bores
Well liquid density and mud cake permeability, calculating obtain pressurized effect force coefficient, by rock mechanics parameters, formation parameter and pressurized effect
Force coefficient is updated in cave-in pressure model, obtains cave-in pressure, more realistically can be reflected under drilling fluid environment
Borehole wall stress characteristics, select reasonable drilling fluid density to provide foundation for drilling process.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of method stream of the computational methods of the cave-in pressure of consideration pressurized effect power of the embodiment of the present invention
Cheng Tu.
Embodiment
To make technical scheme and advantage clearer, below in conjunction with accompanying drawing embodiment of the present invention is made into
One step it is described in detail.
A kind of computational methods for the cave-in pressure for considering pressurized effect power are present embodiments provided, as shown in figure 1, should
Method includes：
Step 101：Formation parameter and drilling fluid are obtained from the geologic information, well-log information and drilling data of selection area
Density；
Specifically, formation parameter and brill can be obtained from the geologic information, well-log information and drilling data of selection area
Well liquid density, acquisition pattern can directly be visited for querying regional record or using measurement while drilling instrument in drilling process
Survey, wherein, formation parameter includes but is not limited to：Well depth, pore pressure, effective stress coefficient, minimum crustal stress, maximum crustal stress
And in-place permeability.
In the present embodiment, analyzed exemplified by a bite risk prospect pit X1 wells for choosing Sichuan province, height where the well
Scope is 3800~3850m, and formation parameter is as shown in table 1,
The formation parameter table of table 1
Step 102：Mud cake permeability is obtained from the drilling fluid permeability test data of selection area；
In the present embodiment, the mud cake permeability obtained from the drilling fluid permeability test data of selection area is 0.01mD.
Step 103：Rock mechanics parameters are obtained from the Rock Mechanics Test data and well-log information of selection area；
Specifically, rock mechanics parameters are obtained from the Rock Mechanics Test data and drilling data of selection area, wherein,
Rock mechanics parameters include：Poisson's ratio, rock cohesion, internal friction angle and porosity.
In the present embodiment, rock sample need to be processed into cylindrical type rock core, such as 25 × 50mm of Φ, and to rock by Rock Mechanics Test
The heart carries out record of weighing, and obtains rock mechanics parameters by rock triaxial compressions measuring and calculation, the value of rock mechanics parameters is such as
Shown in table 2,
The rock mechanics parameters table of table 2
| Numbering | Parameter | Parameter value |
| 1 | Poisson's ratio | 0.25 |
| 2 | Porosity | 5.00% |
| 3 | Internal friction angle of rock/(°) | 10.5 |
| 4 | Rock cohesion/MPa | 31 |
Step 104：According to formation parameter, drilling fluid density and mud cake permeability, pressurized effect force coefficient is obtained；
Specifically, pressurized effect force coefficient is borehole wall pore pressure and the ratio of pit shaft drilling liquid pressure, pressurized effect power
The calculation formula of coefficient is：
In formula：η is effective pressurized effect force coefficient；pzFor pit shaft drilling liquid pressure, unit is MPa；pkFor pore pressure,
Unit is MPa；KcFor mud cake permeability, unit is mD；KrFor in-place permeability, unit is mD.
Wherein, the calculation formula of pit shaft drilling liquid pressure is：
pz=ρ gh
In formula：ρ is drilling fluid density, and unit is g/cm3；G is gravity coefficient 9.8；H is well depth, and unit is m.
Step 105：Rock mechanics parameters, formation parameter and pressurized effect force coefficient are updated to cave-in pressure model
In, obtain cave-in pressure.
Specifically, the expression formula of cave-in pressure model is：
In formula：pzFor cave-in pressure, unit is Mpa；C is rock cohesion, and unit is MPa；φ is internal friction angle,
Unit is degree；σhFor minimum crustal stress, unit is MPa；σHFor maximum crustal stress, unit is MPa；ν is Poisson's ratio；α is to have effect
Force coefficient；For porosity.
In actual drilling process, density is used for 1.15g/cm3Drilling fluid, well should be unable to occur in theory and collapse
Collapse, but actually well enlarging rate is but very high, well amplification degree is universal 15%~35%.Utilize the calculating cave-in pressure
The method of power, caving pressure when obtaining adapting to the under balance pressure drilling of this interval is 45.21MPa, and drilling fluid density is 1.24g/
cm3, the drilling fluid density before explanation employed in actual well drilled process is relatively low, it is impossible to maintain the stabilization of the well section borehole wall,
The fact that collapsed with this actual interval is mutually combined.In the later stage with the further drilling process of interval, density 1.25g/cm is used3Brill
Well liquid, i.e., the density 1.24g/cm calculated with reference to the caving pressure computation model of invention3, stratum collapse rate recognizes within 5%
No longer to collapse.Therefore, it was demonstrated that the result obtained using the method for calculating cave-in pressure provided by the present invention is than conventional
It is more accurate that model calculates obtained result.
The present embodiment is provided by obtaining geologic information, well-log information, drilling data, the drilling fluid permeability test of selection area
Material and Rock Mechanics Test data, obtain formation parameter, drilling fluid density, mud cake permeability and rock mechanics parameters, base area
Layer parameter, drilling fluid density and mud cake permeability, calculating obtain pressurized effect force coefficient, by rock mechanics parameters, formation parameter
It is updated to pressurized effect force coefficient in cave-in pressure model, obtains cave-in pressure, can more realistically reflects brill
Well fluid environment is gone into the well wall stress feature, selects reasonable drilling fluid density to provide foundation for drilling process.
It is described above to be for only for ease of it will be understood by those skilled in the art that technical scheme, not to limit
The present invention.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of computational methods for the cave-in pressure for considering pressurized effect power, it is characterised in that methods described includes：
Formation parameter and drilling fluid density are obtained from the geologic information, well-log information and drilling data of selection area；
Mud cake permeability is obtained from the drilling fluid permeability test data of the selection area；
Rock mechanics parameters are obtained from the Rock Mechanics Test data and the well-log information of the selection area；
According to the formation parameter, the drilling fluid density and the mud cake permeability, pressurized effect force coefficient is obtained；
The rock mechanics parameters, the formation parameter and the pressurized effect force coefficient are updated to cave-in pressure model
In, obtain cave-in pressure.
2. according to the method described in claim 1, it is characterised in that the rock mechanics parameters include：Poisson's ratio, rock are glutinous poly-
Power, internal friction angle and porosity.
3. according to the method described in claim 1, it is characterised in that the Rock Mechanics Test is tested for rock triaxial compressions.
4. according to the method described in claim 1, it is characterised in that the formation parameter includes well depth, pore pressure, has effect
Force coefficient, minimum crustal stress, maximum crustal stress and in-place permeability.
5. according to the method described in claim 1, it is characterised in that the pressurized effect force coefficient is borehole wall pore pressure and well
The ratio of cylinder drilling liquid pressure.
6. method according to claim 5, it is characterised in that the calculation formula of the pressurized effect force coefficient is：
In formula：η is effective pressurized effect force coefficient；pzFor pit shaft drilling liquid pressure, unit is MPa；pkFor pore pressure, unit
For MPa；KcFor mud cake permeability, unit is mD；KrFor in-place permeability, unit is mD.
7. method according to claim 6, it is characterised in that the calculation formula of the pit shaft drilling liquid pressure is：
pz=ρ gh
In formula：ρ is drilling fluid density, and unit is g/cm3；G is gravity coefficient 9.8；H is well depth, and unit is m.
8. method according to claim 7, it is characterised in that the expression formula of the cave-in pressure model is：
In formula：pzFor cave-in pressure, unit is Mpa；C is rock cohesion, and unit is MPa；φ is internal friction angle, unit
For degree；σhFor minimum crustal stress, unit is MPa；σHFor maximum crustal stress, unit is MPa；ν is Poisson's ratio；α is effective stress system
Number；For porosity.
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Cited By (9)
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| CN109187228A (en) * | 2018-09-30 | 2019-01-11 | 西南石油大学 | A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability |
| CN109555515A (en) * | 2018-10-08 | 2019-04-02 | 中国石油大学(北京) | Formation collapsed pressure determines method and apparatus |
| CN109858147A (en) * | 2019-01-30 | 2019-06-07 | 西南石油大学 | A kind of borehole well instability quantifying risk evaluation method based on Reliability Theory |
| CN110847884A (en) * | 2018-08-01 | 2020-02-28 | 中国石油天然气股份有限公司 | Method and device for diagnosing collapse time of oil well |
| CN111797490A (en) * | 2019-04-04 | 2020-10-20 | 中国石油天然气股份有限公司 | Method and equipment for designing safe density of drilling fluid |
| CN112818517A (en) * | 2021-01-07 | 2021-05-18 | 大庆石油管理局有限公司 | Low-permeability oilfield drilling fluid density design method |
| CN113221347A (en) * | 2021-05-07 | 2021-08-06 | 中国石油大学(北京) | Well wall stability drilling optimization method, device and equipment |
| CN113449353A (en) * | 2021-05-18 | 2021-09-28 | 西南石油大学 | Horizontal well wall stability analysis method considering stratum fluid seepage effect |
| CN115408956A (en) * | 2022-08-30 | 2022-11-29 | 中国石油大学(华东) | A method for real-time acquisition of physical and mechanical parameters around wells in hydrate reservoir drilling |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847884A (en) * | 2018-08-01 | 2020-02-28 | 中国石油天然气股份有限公司 | Method and device for diagnosing collapse time of oil well |
| CN110847884B (en) * | 2018-08-01 | 2023-02-28 | 中国石油天然气股份有限公司 | Method and device for diagnosing collapse time of oil well |
| CN109187228A (en) * | 2018-09-30 | 2019-01-11 | 西南石油大学 | A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability |
| CN109555515A (en) * | 2018-10-08 | 2019-04-02 | 中国石油大学(北京) | Formation collapsed pressure determines method and apparatus |
| CN109858147A (en) * | 2019-01-30 | 2019-06-07 | 西南石油大学 | A kind of borehole well instability quantifying risk evaluation method based on Reliability Theory |
| CN111797490B (en) * | 2019-04-04 | 2022-11-04 | 中国石油天然气股份有限公司 | Method and equipment for designing safe density of drilling fluid |
| CN111797490A (en) * | 2019-04-04 | 2020-10-20 | 中国石油天然气股份有限公司 | Method and equipment for designing safe density of drilling fluid |
| CN112818517A (en) * | 2021-01-07 | 2021-05-18 | 大庆石油管理局有限公司 | Low-permeability oilfield drilling fluid density design method |
| CN112818517B (en) * | 2021-01-07 | 2022-11-18 | 大庆石油管理局有限公司 | A Design Method of Drilling Fluid Density in Low Permeability Oilfield |
| CN113221347A (en) * | 2021-05-07 | 2021-08-06 | 中国石油大学(北京) | Well wall stability drilling optimization method, device and equipment |
| CN113221347B (en) * | 2021-05-07 | 2022-10-21 | 中国石油大学(北京) | Well wall stability drilling optimization method, device and equipment |
| CN113449353A (en) * | 2021-05-18 | 2021-09-28 | 西南石油大学 | Horizontal well wall stability analysis method considering stratum fluid seepage effect |
| CN115408956A (en) * | 2022-08-30 | 2022-11-29 | 中国石油大学(华东) | A method for real-time acquisition of physical and mechanical parameters around wells in hydrate reservoir drilling |
| CN115408956B (en) * | 2022-08-30 | 2024-02-02 | 中国石油大学(华东) | Hydrate reservoir drilling Zhou Wuxing and mechanical parameter real-time acquisition method |
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