苏里格区块上部井段PDC钻头研究与应用

Study and application of PDC bit on upper wellbore drilling in sulige block

魏秀艳

WEI Xiuyan

长城钻探钻井技术服务公司，辽宁盘锦　124010

Great Wall Drilling Branch of PetroChina, Panjin 124010, China

大量的钻井实践证明，PDC钻头的剖面形状、切削齿尺寸、后倾角的大小、布齿密度的高低和流道喷嘴设计，对PDC钻头破岩效率和使用寿命有着十分重要的影响。针对苏里格区块2800 m以上井段地层特点，采用现场实践和数值模拟相结合的方法，确定出合理的剖面形状、切削齿尺寸及后倾角、布齿密度和水力结构，研制出?215.9 mmG1943型PDC钻头，该型号钻头在苏里格地区上部井段应用了10井次，平均单只进尺2154.31 m，平均机械钻速26.21 m/h，与临井对比机械钻速提高了29.62%。该型号钻头使用寿命长、机械钻速高，具有很高的推广应用价值。

PDC bit is one of the main rock breaking tools in drilling process. The quality of PDC bit and its compatibility to lithology and other technical drilling conditions directly impact drilling rate, quality and cost. Numbers of drilling practices show that, the rock breaking efficiency and service life of PDC bits are influenced significantly by the profile figure, cogging size, back rake angle, cogging density, and flowpath nozzle design. According to the formation features in the depth above 2800 m in Sulige block, field test and numerical simulation are combined to determine the profile figure, cogging size, back rake angle, cogging density, and hydraulic structure. The ?215.9 mm G1943 PDC bit is developed, which is applied on 10 wells in Sulige block, with the average footage of 2154.31 m, and penetration rate of 26.21 m/h, which is 29.62% higher than the adjacent wells. The bit has the advantages of long service life and high rate of penetration, so it has the value of being popularized.