Volume 32 Issue 6
Nov.  2015
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LI Song, KANG Yili, LI Daqi, ZHANG Dujie, ZHOU Changlin. Diagnosis System for Characterizing Lost Circulation in Troublesome Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 89-95. doi: 10.3969/j.issn.1001-5620.2015.06.023
Citation: LI Song, KANG Yili, LI Daqi, ZHANG Dujie, ZHOU Changlin. Diagnosis System for Characterizing Lost Circulation in Troublesome Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 89-95. doi: 10.3969/j.issn.1001-5620.2015.06.023

Diagnosis System for Characterizing Lost Circulation in Troublesome Formations

doi: 10.3969/j.issn.1001-5620.2015.06.023
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  • Corresponding author: 康毅力,电话(028)83032118
  • Received Date: 2015-05-13
  • Publish Date: 2015-11-30
  • Lost circulation imposes the most serious damage to reservoir and is an arduous technological problem remained unsolved.To diagnose and control lost circulation, three elements to lost circulation, i.e., location in which mud is lost, type of lost circulation, and rate of mud loss, should be fundamentally understood.The mechanism and type of lost circulation are the prerequisite for selecting/making the reasonable lost circulation control technology.In lost circulation prediction, drilling data and geological data are the most important.Series of laboratory studies have been conducted to find a method for lost circulation diagnosis.Studies were conducted on the stress sensitivity of fractures and vugs, and the propagation mechanism of fractures.The deformation of channels into which mud is lost and the rate of mud loss can be predicted for the choice of best lost circulation materials.When lost circulation occurs, drilling parameters such as penetration rate and drill cuttings change correspondingly, and real-time mud logging data can be used to predict the status of lost circulation.In the diagnostic model developed, the type of lost circulation is diagnosed using circulating pressure when lost circulation occurs.Based on the understanding of the changing course of lost circulation, a preliminary diagnostic system for lost circulation is developed, providing theoretical support for lost circulation control.


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