Borehole stability evaluation method for highly-deviated well
A technology for highly deviated wells and boreholes, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc., and can solve problems such as well wall collapse
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[0078] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0079] The present invention is a mechanical method suitable for evaluating the wellbore stability of highly deviated wells in offshore oil land production. The evaluation method includes the following steps:
[0080] [101] Step 1, using the acoustic time difference and density logging data to obtain the formation pressure P p ;
[0081] [102] Step 2, measuring the magnitude and direction of the in-situ stress, and the rock strength parameters of the formation;
[0082] [103] Step 3, converting the obtained geostress to the borehole wall stress under the coordinates of the deviated well;
[0083] [104] Step 4, determine the criterion for judging the wall instability of highly deviated wells;
[0084] [105] Step 5: Establish the chan...
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