Abstract: Well GP09-14 was the first Oil horizontal well dilled by Directional Well Technology Service Company in Chan-gqing Oilfield Company.The drilling target is lower Ordovi cian,Ma jiagouzu,Mawu12 and Mawu13 formation.During drilling,accord to poor wellbore wall stability of large hole,Shuangshi bed was easy to collapse,barefoot laterally drill ing,different of production formations depth resulted to of-ten adjust trajectory,wellbore cleaning and drag and torque prediction a set of technology measurements was proposed,appropriate drilling fluid was adopted,in order to drill this well successfully.The total length of horizontal borehole of the well was 1011 m.The proportion of Gas formations was 90%.GP09-14 has not only important effect on improving deliverability,but also important data to effective infrastruc ture in the block.