During drilling through asphalt layer in the Yada Oilfield ,asphalt invasion posed a lot of down-hole issues such as mud contamination ,well kick and mud loss coexistence ,bringing tremendous challenges in operation .In order to solve those problems ,studies w ere conducted on safe drilling technolo-gies for the asphalt layer in the YD Oilfield .Depending on asphalt invasion characteristics ,induced dow n-hole issues and major techniques and measures taken ,the wells were divided into 4 classes .The techniques and measures applied in drilling through asphalt layer in the YD Oilfield were summarized .For each of the 4 classes of w ells ,it is proposed to employ specific drilling techniques and measures depending on the char-acteristics and extent of asphalt invasion .The drilling practices in the YD Oilfield demonstrated that speci-fied drilling techniques and measures should be implemented depending on types of asphalt invasion in or-der to effectively ensure the safe drilling through asphalt layer in the YD Oilfield .%在YD油田钻穿沥青层的过程中，易出现沥青侵入导致的溢流、井涌等井下故障，极太影响了钻井安全，为此，开展了YD油田沥青层安全钻井技术研究。根据已钻井的沥青侵入特点、沥青所造成的井下故障及采取的主要技术措施，将钻遇沥青层的井分为4类。对YD油田钻遇沥青层时所采用技术及采取的技术措施进行了总结，并结合钻遇沥青层井的分类，提出应根据沥青侵入的特征及程度，采用相应的安全钻井技术并采取相应的技术措施。YD油田的钻井实践表明，针对不同类型的沥青侵入情况采用相应的钻井技术和技术措施，可以解决YD油田沥青层安全钻井的技术难点。
展开▼
