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《Natural Gas Industry》 2011-01
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Application of sea-water drilling fluid system at Block Lao 168 in the Bohai Bay Basin

Zhao Hui(No.1 Bohai Drilling Company,Sinopec Shengli Branch,Dongying,Shandong 257237,China)  
Clusters of wells at Block Lao 168 of the Laohekou oilfields in the Bohai Bay Basin are the key development zone for the Sinopec to get more offshore hydrocarbon reserves.Among those total 69 planned wells,most wells' horizontal displacements have exceeded 1500 m,the maximum of which is up to more than 2000 m.As for those most shallow and large-hole directional wells,the drilling fluid is prepared by direct use of sea water,which will result in stricter requirement for the drilling fluid system.In view of this,some technical measures are adopted as follows: a.selecting high-inhibition polymer to inhibit shale swelling;b.using 4-stage solid control equipment and high-molecular encapsulating agent to enhance flocculation of cuttings so as to remove the harmful solids from the drilling fluid;c.using high anti-salt gel-stabilizing agent to reduce the filtration of the drilling fluid;d.conducting short trips and well cleaning to reduce wellbore friction and avoid a cuttings bed;e.adding a certain amount of crude oil into the drilling fluid according to the actual friction and torque situation in order to increase the lubrication performance of the drilling fluid.As a result,this kind of lubricating anti-caving sea-water polymer drilling fluid system has been successfully used in this area and the field experiences in four extended reach and 3-spud wells(Lao 168-2,Lao 168-55,Lao 168-43,Lao 168-59) are also introduced herein.
【CateGory Index】: TE254.4
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