Method for prediction of collapse pressure and fracture pressure of stratum under drill bit while drilling

A technology of rupture pressure and collapse pressure, which is used in the field of predicting the collapse pressure and rupture pressure of the stratum under the drill bit by using seismic records while drilling, and can solve the problems of wall collapse, rupture, and complicated downhole operations.

Inactive Publication Date: 2007-05-23
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0002] In the process of oil drilling, due to the formation of the wellbore, stress concentration occurs, and the density of the drilling fluid in the well is too low or too high, which will cause the well w

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  • Method for prediction of collapse pressure and fracture pressure of stratum under drill bit while drilling
  • Method for prediction of collapse pressure and fracture pressure of stratum under drill bit while drilling
  • Method for prediction of collapse pressure and fracture pressure of stratum under drill bit while drilling

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Embodiment Construction

[0108] Below with reference to accompanying drawing 23, the method for using seismic records to predict the collapse pressure and fracture pressure of the section to be drilled in the present invention is described in detail, and the method mainly includes the following steps:

[0109] Step 1, for the drilled well and the well to be drilled, respectively extract several seismic records beside the respective wells, and perform weighting processing to obtain the seismic records of the drilled well and the well to be drilled, as shown in Figure 1 and Figure 12;

[0110] Step 2, performing acoustic time difference and density logging on the drilled well, obtaining the acoustic time difference logging data and formation density logging data of the different layers of the drilled well; thereby obtaining the acoustic time difference logging curve and the formation density logging curve, As shown in Figure 2 and Figure 3;

[0111] Step 3, using the logging data and seismic records of ...

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Abstract

It relates to a method of predicting the collapse and crack pressure underground with the drilling head. Recording the earthquake status of a well to be drilled and several other adjacent drills that have already been drilled, getting the earthquake record of the well to be drill and already drilled through weighting, through sound wave echoing difference and density measuring for the already drilled wells to get the log data of different strata, a hierarchical model can be established to predict the sound wave speed and wave resistance of each strata based on the earthquake record. Through the log curve predicted of the strata of the well to be drilled, the collapse and crack pressure of the strata can be predicted combined with the interpretative model of the well wall stability mechanics logging. It can effectively prevent the collapse of the well wall and accidents occurrence underground.

Description

technical field [0001] The invention relates to a method for predicting collapse pressure and rupture pressure while drilling, more specifically, a method for predicting the collapse pressure and rupture pressure of the formation under the drill bit while drilling by using seismic records. Background technique [0002] In the process of oil drilling, due to the formation of the wellbore, stress concentration occurs, and the density of the drilling fluid in the well is too low or too high, which will cause the well wall to collapse (diameter shrinkage) or rupture, resulting in complex downhole operations and prone to accidents. The manpower and material resources of drilling operations bring different degrees of losses. [0003] For this reason, how to predict the collapse pressure and fracture pressure before drilling is very necessary, because if the collapse pressure or fracture pressure can be predicted before drilling, it can provide a scientific basis for the drilling d...

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Application Information

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IPC IPC(8): E21B47/06
Inventor 金衍陈勉吴超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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