Method of acquiring while-drilling stratum pressure by fitting logging parameters based on while-drilling rock and mineral data

A data fitting and formation pressure technology, applied in special data processing applications, surveying, earthwork drilling, etc., can solve the problem of inability to obtain formation pressure while drilling

Pending Publication Date: 2020-11-13
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0008] The present invention provides a method for obtaining formation pressure while drilling by fitting logging pa...

Method used

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  • Method of acquiring while-drilling stratum pressure by fitting logging parameters based on while-drilling rock and mineral data
  • Method of acquiring while-drilling stratum pressure by fitting logging parameters based on while-drilling rock and mineral data
  • Method of acquiring while-drilling stratum pressure by fitting logging parameters based on while-drilling rock and mineral data

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Embodiment 1

[0050] Embodiment 1: as attached figure 1 As shown, the method for obtaining formation pressure while drilling by fitting logging parameters based on rock ore data while drilling includes:

[0051] Using the formula (1) to calculate the acoustic time difference,

[0052]

[0053] In formula (1):

[0054] f AC is the acoustic time difference, μs / ft,

[0055] R IS is the relative content of the muddy layer while drilling,

[0056] b 0 , b 1 , b 2 , b 3 is the coefficient related to the i / fog layer;

[0057] Using formula (2) to calculate the speed of sound wave,

[0058] v p =1 / F AC (2)

[0059] In formula (2):

[0060] v p is the speed of sound wave, km / s;

[0061] Formula (3) is used to calculate the rock density, formula (4) is used to calculate the shale content, and formula (5) is used to calculate the vertical effective stress,

[0062]

[0063] V sh =R IS +R M +R K +R I (4)

[0064]

[0065] In formulas (3) to (5):

[0066] ρ is rock densi...

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Abstract

The invention relates to the technical field of while-drilling stratum pressure calculation methods, in particular to a method of acquiring the while-drilling stratum pressure by fitting logging parameters based on while-drilling rock and mineral data. The method comprises the steps of calculating the rock density, the shale content, the vertical effective stress, the acoustic wave velocity and the porosity of a while-drilling stratum according to the while-drilling rock and mineral data; and calculating the while-drilling stratum pressure through calculated parameters. According to the methodof acquiring the while-drilling stratum pressure, through combination of the while-drilling rock and mineral analysis data acquired continuously in time and an interpretation method that logging is not limited by undercompaction causes, a stratum pressure calculation method under multiple pressure formation mechanisms is established. Moreover, the correlation of the while-drilling stratum pressure calculated through the method of acquiring the while-drilling stratum pressure and the logging interpretation stratum pressure is very high, evaluation of a site for the stratum pressure is met, thedrilling fluid density can be guided, and the risk early warning of the stratum pressure can be given.

Description

technical field [0001] The invention relates to the technical field of calculation methods for formation pressure while drilling, and relates to a method for obtaining formation pressure while drilling by fitting logging parameters based on rock and mine data while drilling. Background technique [0002] Domestic interpretation methods of formation pressure while drilling are mainly based on well logging data or comprehensive mud logging data, especially in areas with complex causes of formation pressure, and there is no method or result for calculating formation pressure while drilling using rock and mine data. [0003] The geological conditions in the southern margin of the Junggar Basin are complex and have experienced multiple periods of tectonic movements. Drilling is difficult, and logging-while-drilling costs are high. Wells deployed in recent years have not carried out logging-while-drilling. At present, the evaluation of formation pressure using well logging data u...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/00E21B47/06G06F30/20
CPCE21B49/00E21B47/00E21B47/06G06F30/20
Inventor 薛晓军解俊昱王晨李秀彬于景峰金庭科
Owner BC P INC CHINA NAT PETROLEUM CORP
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