CN113175322B - Formation loss pressure profile establishing method, computer device and storage medium - Google Patents
Formation loss pressure profile establishing method, computer device and storage medium Download PDFInfo
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- CN113175322B CN113175322B CN202110466414.3A CN202110466414A CN113175322B CN 113175322 B CN113175322 B CN 113175322B CN 202110466414 A CN202110466414 A CN 202110466414A CN 113175322 B CN113175322 B CN 113175322B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000015572 biosynthetic process Effects 0.000 title claims description 28
- 238000002474 experimental method Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000004590 computer program Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 6
- 239000013535 sea water Substances 0.000 claims description 6
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- 230000005484 gravity Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000005755 formation reaction Methods 0.000 description 19
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- 239000007788 liquid Substances 0.000 description 1
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- 239000003208 petroleum 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a method for establishing a stratum leakage pressure profile, a computer device and a storage medium, wherein the method comprises the following steps: s1, obtaining measured values of the leakage pressure and the fracture pressure of the drilled well according to an experiment on the drilled well in the area; s2, calculating a comprehensive leakage coefficient K according to the actual measurement values of the leakage pressure and the fracture pressure of the drilled well in the region; s3, obtaining geomechanical parameters by using the well-drilled density logging value and floor drain experimental data; s4, calculating a fracture pressure section of the target well by using the geomechanical parameters; s5, calculating to obtain the leakage pressure profile of the target well by using the fracture pressure profile of the target well and the calculated comprehensive leakage coefficient K. The invention can accurately predict the leakage pressure profile before the target well is drilled, optimize the well structure and avoid the occurrence of the conditions of lost circulation, lost circulation of drilling fluid and the like.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production, in particular to a method for establishing a stratum leakage pressure profile, a computer device and a storage medium.
Background
In the drilling engineering, inaccurate stratum leakage pressure prediction in the pre-drilling stage is likely to cause complex drilling problems such as lost circulation, lost circulation of drilling fluid and the like. At present, the formation leakage pressure profile is established mainly by a horizontal minimum ground stress method, namely, the drilling fluid leakage can be caused by considering that the pressure of a liquid column of a well bore exceeds the horizontal minimum ground stress. But the method is only applicable to incomplete strata such as fracture zones, fault development zones, karst cave development layers and the like. In practice, the majority of formations that a drill bit encounters are conventional, complete formations, and practice shows that the horizontal least ground stress method is too conservative and results are low.
Therefore, it is necessary to provide a method for establishing a formation loss pressure profile for a conventional integrity formation to make up for the shortages of the existing methods.
Disclosure of Invention
In view of the foregoing, the present invention is directed to a method, a computer device and a storage medium for establishing a formation loss pressure profile, so as to overcome the defect of deviation of the existing calculation result.
The invention firstly provides a method for establishing a stratum leakage pressure profile, which comprises the following steps:
s1, obtaining measured values of the leakage pressure and the fracture pressure of the drilled well according to an experiment on the drilled well in the area;
s2, calculating a comprehensive leakage coefficient K according to the actual measurement values of the leakage pressure and the fracture pressure of the drilled well in the region;
s3, obtaining geomechanical parameters by using the well-drilled density logging value and floor drain experimental data;
s4, calculating a fracture pressure section of the target well by using the geomechanical parameters;
s5, calculating to obtain the leakage pressure profile of the target well by using the fracture pressure profile of the target well and the calculated comprehensive leakage coefficient K.
According to an embodiment of the present invention, in step S2, the integrated leakage coefficient K is:
wherein Pf Drilled i Each measured value of the fracture pressure of the drilled well; pl (Pl) Drilled i Each measured value of the lost pressure of the drilled well; n is the number of the actual points of the lost pressure and the fracture pressure of the drilled well.
According to one embodiment of the present invention, in step S3, the geomechanical parameters include overburden pressure, horizontal maximum ground stress, horizontal minimum ground stress.
According to one embodiment of the invention, the overburden pressure includes: sea water layer range pressure and formation range pressure.
According to one embodiment of the invention, the overburden pressure, the horizontal maximum ground stress, the horizontal minimum ground stress are respectively:
wherein OBG is overburden pressure; sigma (sigma) H 、σ h Respectively horizontal maximum ground stress and horizontal minimum ground stress; ρ is the density of the sedimentary rock; g is gravity acceleration; 0-wd is the sea water depth integration interval; wd-H is the formation depth integration interval; h is the well depth of the target well; v is the poisson ratio of the stratum; omega 1 、ω 2 Should be of horizontal constructionA force coefficient; biot is the effective stress coefficient; p (P) p Is pore pressure.
According to one embodiment of the present invention, in step S4, the fracture pressure of the target well is calculated using the geomechanical parameters obtained, and the calculation formula is as follows:
wherein P is f1 ＝3σ H -(σ h cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
P f2 ＝3σ h -(σ H cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
In sigma H 、σ h Respectively horizontal maximum ground stress and horizontal minimum ground stress; OBG is overburden pressure; biot is the effective stress coefficient; θ is the azimuth angle; psi is the well inclination angle; p (P) p Is pore pressure; s is S t Is the tensile strength of the stratum.
According to one embodiment of the present invention, in step S5, the leak pressure of the target well is:
Pl target object ＝Pf Target object -K·(Pf Target object -1)
Wherein Pl is Target object A lost pressure for the target well; pf (Pf) Target object A fracture pressure for the target well; k is the integrated leakage coefficient.
In step S1, the drilled experiments include floor drain experiments, formation integrity experiments, according to an embodiment of the present invention.
The invention also provides a computer device, which comprises a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the steps of the method for creating a formation leak-off pressure profile when executing the computer program.
The invention also provides a computer storage medium, wherein the storage medium is stored with a computer program, and when the computer program is executed by a processor, the steps of the formation loss pressure profile establishing method are realized.
The invention can scientifically predict the leakage pressure profile before the target well is drilled, optimize the well structure and avoid the occurrence of the conditions of lost circulation, lost circulation of drilling fluid and the like.
Drawings
FIG. 1 is a flow chart of a method for creating a formation leak-off pressure profile according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
The invention aims to provide a method and a process for establishing a stratum leakage pressure profile, which are suitable for a stratum with conventional integrity.
In order to achieve the above purpose, the technical scheme adopted by the invention mainly comprises the following steps: 1) Obtaining measured values of the leakage pressure and the fracture pressure of the drilled well; 2) Calculating a comprehensive leakage coefficient K; 3) Obtaining geomechanical parameters; 4) Calculating a fracture pressure profile of the target well; 5) And calculating the leakage pressure profile of the target well.
The method has strong field practicability, easily acquired basic data, considers various factors of an integrity stratum, and overcomes the defect of low calculation result of a horizontal minimum ground stress method.
As shown in fig. 1, the flow of the method for establishing the stratum leakage pressure profile provided by the embodiment of the invention mainly comprises the following steps:
1) Acquiring actual measurement values of the leakage pressure and the fracture pressure of the drilled well according to floor drain experiment (L.O.T) and formation integrity experiment (F.I.T) data of the drilled well in the region;
2) Calculating a comprehensive leakage coefficient K by using the measured values of the leakage pressure and the burst pressure of the drilled well in the area obtained in the step 1):
wherein Pf Drilled i Each measured value of the fracture pressure of the drilled well; pl (Pl) Drilled i Each measured value of the lost pressure of the drilled well; n is the number of lost pressure and fracture pressure real points drilled.
In the step 2), the actual measurement values of the lost pressure and the fracture pressure of the drilled well in the area are utilized, and the obtained comprehensive lost coefficient K can represent the real relationship between the lost pressure and the fracture pressure of the area.
The integrated leak-off coefficient K will be applied to the leak-off pressure profile calculation process for the target well in the region.
3) Three geomechanical parameters, namely overburden pressure, horizontal maximum ground stress and horizontal minimum ground stress, are obtained by using the well-drilled density logging value and floor drain experimental data:
wherein OBG is overburden pressure; sigma (sigma) H 、σ h Respectively horizontal maximum ground stress and horizontal minimum ground stress; ρ is the density of the sedimentary rock; g is gravity acceleration; 0-wd is the sea water depth integration interval; wd-H is the formation depth integration interval; h is the well depth of the target well; v is the poisson ratio of the stratum; omega 1 、ω 2 The stress coefficient is constructed horizontally; biot is the effective stress coefficient; p (P) p Is pore pressure.
Wherein overburden pressure is made up of two parts: (1) 0-wd is the seawater layer range and (2) wd-H is the formation range.
4) And calculating the fracture pressure of the target well by using the obtained geomechanical parameters, wherein the calculation formula is as follows:
wherein P is f1 ＝3σ H -(σ h cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
P f2 ＝3σ h -(σ H cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
In sigma H 、σ h Respectively horizontal maximum ground stress and horizontal minimum ground stress; OBG is overburden pressure; biot is the effective stress coefficient; θ is the azimuth angle; psi is the well inclination angle; p (P) p Is pore pressure; s is S t Is the tensile strength of the stratum.
5) And (3) calculating the leakage pressure of the target well by using the comprehensive leakage coefficient K obtained in the step (2) and the target well fracture pressure obtained in the step (4), wherein the expression is as follows:
Pl target object ＝Pf Target object -K·(Pf Target object -1)
Wherein Pl is Target object Leak-off pressure for the target well; pf (Pf) Target object Fracturing pressure for the target well; k is the integrated leakage coefficient.
The invention also provides a computer device, which comprises a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the steps of the method for creating a formation leak-off pressure profile when executing the computer program.
The invention also provides a computer storage medium, wherein the storage medium is stored with a computer program, and when the computer program is executed by a processor, the steps of the formation loss pressure profile establishing method are realized.
Compared with the prior art, the method comprises the following steps: the existing method simply equalizes the leakage pressure and the horizontal minimum ground stress, and the formula is as follows:
Pl target object ＝σ h
The existing method is only suitable for non-integral stratum, is not suitable for the most common integral stratum encountered by actual drilling, and has larger deviation, and the method is more scientific and reasonable and more practical.
The method for establishing the leakage pressure profile is characterized in that the leakage pressure profile is obtained by giving the influence of the comprehensive leakage coefficient K on the basis of the fracture pressure profile, and is different from the prior method which directly takes the minimum ground stress into account, the relationship between the fracture pressure and the leakage pressure is not considered, the prior method is only suitable for an incomplete stratum, and the calculated result is lower and is too conservative when the method is used in a conventional complete stratum.
The method for establishing the leakage pressure profile can scientifically predict the leakage pressure profile before the target well is drilled, optimize the well structure and avoid the occurrence of the conditions of lost circulation, drilling fluid return and the like.
Examples
By using the method and the process for establishing the stratum leakage pressure profile according to the embodiment of the invention, the comprehensive leakage coefficient K=0.043 is calculated according to the actually measured data sheet (table 1) of the drilled well. According to geomechanical parameters of the target well, further calculating to obtain the leakage pressure of 1.67g/cm at 3500m depth of the target well 3 Calculated 1.52g/cm above horizontal minimum ground stress method 3 And the actual leakage pressure value of the retest is 1.68g/cm 3 . From this, it can be seen that the results are more consistent with the true value of the formation leak-off pressure for integrity.
Table 1 table of measured data for drilled well
Table 2 geomechanical parameters table for target wells
| Geomechanical parameters | Numerical value |
| Calculating well depth/m | 3500 |
| Horizontal minimum ground stress g/cm 3 | 1.52 |
| Horizontal maximum ground stress g/cm 3 | 1.78 |
| Overburden pressure g/cm 3 | 2.15 |
| Effective stress coefficient | 0.85 |
| Azimuth angle/° | 0 |
| Well angle/° | 0 |
| Pore pressure coefficient g/cm 3 | 1.35 |
| Tensile strength of stratum/MPa | 2.5 |
| (calculation of the invention) target well loss pressure g/cm 3 | 1.67 |
The foregoing description of the exemplary embodiments of the invention is not intended to limit the scope of the invention, but rather to limit the scope of the invention. Moreover, it should be noted that the components of the present invention are not limited to the above-mentioned overall application, and each technical feature described in the specification of the present invention may be selected to be used alone or in combination according to actual needs, so that other combinations and specific applications related to the present invention are naturally covered by the present invention.
Claims (5)
1. A method of establishing a formation leak-off pressure profile, the method comprising the steps of:
s1, obtaining measured values of the leakage pressure and the fracture pressure of the drilled well according to an experiment on the drilled well in the area;
s2, calculating a comprehensive leakage coefficient K according to the actual measurement values of the leakage pressure and the fracture pressure of the drilled well in the region;
s3, obtaining geomechanical parameters by using the well-drilled density logging value and floor drain experimental data;
s4, calculating a fracture pressure section of the target well by using the geomechanical parameters;
s5, calculating to obtain a leakage pressure profile of the target well by using the fracture pressure profile of the target well and the calculated comprehensive leakage coefficient K;
in step S2, the integrated leakage coefficient K is:
wherein Pf Drilled i Each measured value of the fracture pressure of the drilled well; pl (Pl) Drilled i Each measured value of the lost pressure of the drilled well; n is the number of the actual measurement points of the lost pressure and the fracture pressure of the drilled well;
in step S3, the geomechanical parameters include overburden pressure, horizontal maximum ground stress, horizontal minimum ground stress;
the overburden pressure, the horizontal maximum ground stress, and the horizontal minimum ground stress are respectively:
wherein OBG is overburden pressure; sigma (sigma) H 、σ h Respectively horizontal maximum ground stress and horizontal minimum ground stress; ρ is the density of the sedimentary rock; g is gravity acceleration; 0-wd is the sea water depth integration interval; wd-H is the formation depth integration interval; h is the well depth of the target well; v is the poisson ratio of the stratum; omega 1 、ω 2 The stress coefficient is constructed horizontally; biot is the effective stress coefficient; p (P) p Is pore pressure;
in step S4, the fracture pressure of the target well is calculated by using the obtained geomechanical parameters, and the calculation formula is as follows:
wherein P is f1 ＝3σ H -(σ h cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
P f2 ＝3σ h -(σ H cos 2 ψ+OBG·sin 2 ψ)-Biot·P p +S t
In sigma H 、σ h Respectively the horizontal maximum ground stress and the horizontalMinimum ground stress; OBG is overburden pressure; biot is the effective stress coefficient; θ is the azimuth angle; psi is the well inclination angle; p (P) p Is pore pressure; s is S t Is the tensile strength of the stratum;
in step S5, the leak pressure of the target well is:
Pl target object ＝Pf Target object -K·(Pf Target object -1)
Wherein Pl is Target object A lost pressure for the target well; pf (Pf) Target object A fracture pressure for the target well; k is the integrated leakage coefficient.
2. The method of establishing a formation leak-off pressure profile of claim 1, wherein the overburden pressure comprises: sea water layer range pressure and formation range pressure.
3. The method of creating a formation leak-off pressure profile according to claim 1 or 2, wherein in step S1, the drilled experiments comprise floor drain experiments, formation integrity experiments.
4. A computer apparatus comprising a memory and a processor; the memory is used for storing a computer program; the processor for implementing the steps of the method of establishing a formation leak-off pressure profile as defined in any one of claims 1 to 3 when the computer program is executed.
5. A computer storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method for establishing a formation leak-off pressure profile according to any one of claims 1 to 3.
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| CN111980698A (en) * | 2020-09-30 | 2020-11-24 | 西南石油大学 | Deep high-temperature shale formation fracture pressure calculation method considering thermal damage |
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| CN106285646B (en) * | 2016-09-09 | 2019-10-15 | 中国石油大学(华东) | Drilling well loss horizon recognition methods based on multi-information fusion |
| CN108825156B (en) * | 2017-05-05 | 2020-08-25 | 中国石油化工股份有限公司 | Gas invasion control method for pressure control drilling |
| CN107169248B (en) * | 2017-07-05 | 2020-06-30 | 中海石油(中国)有限公司 | Special stratum safe mud density window determination method |
| US11236597B2 (en) * | 2018-11-07 | 2022-02-01 | Halliburton Energy Services, Inc. | Downhole customization of fracturing fluids for micro-fracturing operations |
| CN112560246B (en) * | 2020-12-07 | 2024-04-26 | 中海石油(中国)有限公司 | Prediction method for stratum pressure coefficient of scattered points of target well |
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| CN103015996A (en) * | 2012-12-31 | 2013-04-03 | 中国石油大学(华东) | Method for predicting high steep structure stratum leakage velocity before drilling |
| CN111980698A (en) * | 2020-09-30 | 2020-11-24 | 西南石油大学 | Deep high-temperature shale formation fracture pressure calculation method considering thermal damage |
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