Method and system for pre-drill pore pressure prediction

A technology of pore pressure and prediction method, applied in measuring devices, geophysical measurements, instruments, etc., can solve the problems of reducing borehole size, increasing the number of casing strings, economic losses, etc.

Inactive Publication Date: 2008-10-01
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In addition, when drilling into overpressured formations, the number of casing strings (ie, the structural support inserted into the borehole) required may increase
In particular, without sufficiently accurate pre-drill pore pressure predictions, it is possible to premature

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  • Method and system for pre-drill pore pressure prediction
  • Method and system for pre-drill pore pressure prediction
  • Method and system for pre-drill pore pressure prediction

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For consistency in the various drawings, the same reference numerals are used to denote the same elements.

[0021] In the following detailed description of the embodiments of the present invention, a number of specific details are given in order to provide a fuller understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well known features have not been described in detail in order to avoid unnecessarily complicating the description.

[0022] In summary, embodiments of the present invention provide methods and systems for pre-drilling pore pressure prediction. Specifically, the pre-drill pore pressure is predicted using reference data, acoustic or seismic wave velocities relative to the pre-drill location, at l...

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Abstract

A method for pore pressure prediction includes obtaining a stress sensitivity coefficient, obtaining a compressional wave (P-wave) velocity and a shear wave (S-wave) velocity for a pre-drill location and obtaining a first predicted pore pressure. Further, the method includes iteratively performing calculating a total stress value associated with the pre-drill location using the first predicted pore pressure associated with the pre-drill location, and calculating a second predicted pore pressure associated with the pre-drill location using a stress-pressure relationship equation, a stress-velocity relationship equation, the stress sensitivity coefficient, a reference location, and at least one selected from a group consisting of the P-wave velocity and the S-wave velocity for the pre-drill location, and adjusting a drilling operation associated with the pre-drill location, based on the second predicted pore pressure.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 595,814, filed August 8, 2005, by Colin Michael Sayers and Richard Anthony Birchwood, entitled "Sub-Salt Pore Pressure Prediction," which application is hereby incorporated by reference in its entirety as references. Background technique [0003] Some substances (such as salt, etc.) have low permeability, that is, they are not easy to pass through fluids. In some cases, the low permeability material may be on top of the material targeted by the drilling operation. [0004] Figure 1 shows a schematic diagram of a drilling operation. Those skilled in the art will understand that the drilling operations shown in Figure 1 are for illustrative purposes only and should not be construed as limiting the scope of the present invention. For example the drilling operation shown in Figure 1 is a subsea drilling operation, but the drilling operation may...

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Application Information

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IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/284G01V1/30G01V1/306
Inventor 科林·M·塞耶斯理查德·A·伯奇伍德
Owner PRAD RES & DEV LTD
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