Polyamine composite-salt drilling fluid with lubrication and anti-collapse performance and its application to extended-reach Fanxie-166 well
Located at Fanxie-166 block on the downthrown side of Gaoqing Fault,Boxing subsag,Dongying sag,Jiyang depression,Fanxie-166 well is an important extended-reach appraisal well attached to Oil and Gas Exploration Management Center in Sinopec Shengli Petroleum Engineering Corporation.It is characterized by the designed depth of 5,664.07 m,the bottomhole inclination of nearly 60°,the horizontal displacement of 3,000 m,and the bottomhole temperature up to 190℃,respectively,bringing about chal-lenges in achieving wellbore stability,borehole cleaning,as well as lubrication and anti-collapse roles.So,one strategy of drilling fluid was made,that the polyamine composite-salt(PCS)with lubrication and anti-collapse property was developed after selecting optimal treatment agent,and then experimental evaluation and field application were implemented to gain better results.This evalua-tion demonstrates that the PCS drilling fluid boasts better inhibition and strong plugging,better lubrication and temperature resistance,and good rheology even at 190℃.The field application shows that(ⅰ)with the support of drilling-fluid maintenance and treatment,the PCS may facilitate an optimal and fast drilling,with the actual period of only 54.5 d,39.4％shorter than the designed one,which in-dicates high time-efficiency in drilling,and the average ROP of 12.89 m/h which records a new high ROP in similar wells in the same block;and(ⅱ)the PCS can effectively prevent wellbore instability and realize lubrication and anti collapse during drilling of extend-ed-reach wells.In drilling practice,the wellbore is stable,and the average enlargement rate of the wellbore diameter is only 3.16％in the third spud,and the borehole is adequately cleaned.This drilling fluid has strong suspension and carrying capacity at high tempera-ture.Both lubrication and anti-caving performance are satisfactory,resulting in low frictional resistance and torque during directional drilling,smooth round trip,and successful completion.The proposed PCS drilling fluid may provide technical support for subsequent drilling in Fanxie-166 block,and is also referential for preparing drilling fluid for similar extended-reach wells in other blocks.
Polyamine composite saltFanxie-166 wellExtended reachWellbore stabilityBorehole cleaningLubrication and an-ti-collapse
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