Kick circulation analysis for extended reach and horizontal wells

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Title: Kick circulation analysis for extended reach and horizontal wells
Author: Long, Maximilian Mark
Abstract: Well control is of the utmost importance during drilling operations . Numerous well control incidents occur on land and offshore rigs . The consequences of a loss in well control can be devastating . Hydrocarbon reservoirs and facilities may be damaged , costing millions of dollars . Substantial damage to the environment may also result . The greatest risk , however , is the threat to human life . As technology advances , wells are drilled to greater distances with more complex geometries . This includes multilateral and extended -reach horizontal wells . In wells with inclinations greater than horizontal or horizontal wells with washouts , buoyancy forces may trap kick gas in the wellbore . The trapped gas creates a greater degree of uncertainty regarding well control procedures , which if not handled correctly can result in a greater kick influx or loss of well control . For this study , a three -phase multiphase flow simulator was used to evaluate the interaction between a gas kick and circulating fluid . An extensive simulation study covering a wide range of variables led to the development of a best -practice kick circulation procedure for multilateral and extended -reach horizontal wells . The simulation runs showed that for inclinations greater than horizontal , removing the gas influx from the wellbore became increasingly difficult and impractical for some geometries . The higher the inclination , the more pronounced this effect . The study also showed the effect of annular area on influx removal . As annular area increased , higher circulation rates are needed to obtain the needed annular velocity for efficient kick removal . For water as a circulating fluid , an annular velocity of 3 .4 ft /sec is recommended . Fluids with higher effective viscosities provided more efficient kick displacement . For a given geometry , a viscous fluid could remove a gas influx at a lower rate than water . Increased fluid density slightly increases kick removal , but higher effective viscosity was the overriding parameter . Bubble , slug , and stratified flow are all present in the kick -removal process . Bubble and slug flow proved to be the most efficient at displacing the kick .
URI: http : / /hdl .handle .net /1969 .1 /1542
Date: 2005-02-17

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Kick circulation analysis for extended reach and horizontal wells. Available electronically from http : / /hdl .handle .net /1969 .1 /1542 .

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