Key Technology Research Of Deep Gas Drilling In Jilin Oil Field

The research of this paper aims at some difficult problems like horizontal section length of horizontal wells unable to fully meet the demand of geological development in the process of deep gas development drilling, slow drilling rate resulting from applying three-spud-in well profile in vertical wells drilling for deep dense gas reservoir, high drilling costs and unable to produce after the completion of the Well ChangShenPing-2and so on in JiLin Oilfield. The thesis research has formed supporting key technologies, which includes drilling and completion technology for the long section interval horizontal wells meeting deep gas development, technology of well profile optimization and simplification, cost reducing and drilling rates improving, and the drilling and completion technology of sidetrack drilling in slim-hole horizontal well and realized high efficiency development in deep gas reservoir.The paper obtained the following research fruits:First, aiming at formation characteristics of deep gas, the research comes up with technology of friction decreasing and torque reducing for horizontal well drilling under circumstance of well profile optimization and simplification, which leads to a historic breakthrough of the1200m length of the horizontal section drilling of deep horizontal wells, the drilling cost per meter is saved.Second, the forming of technologies of sidewall stability and optimization and drilling acceleration of PDC bits in deep gas well, enables simplification of well profile from three-spud-in to two spud-in for vertical wells, which results in significant shortening of construction period and lower of drilling cost.Finally, the developing of the dual casing window opening technology and technology of the slim horizontal wellbore sidetracking in hard and abrasive formation sets a record of the deepest sidetracking well onshore, China.The research of this paper has magnificant pertinence and practical utility to the deep gas well,which supplies important reference for deep gas well exploration,it also speed up the drilling speed in deep gas well drilling, decrease the comprehensive cost of deep gas well, it has realistic significance and pratical value for oilfield,which has the splendid and broad application prospects.