Shallow Horizontal Well Drilling And Completion Technology

Horizontal well drilling and completion technology of shallow oil and gas reservoir is actively recognized by most oil field at home and abroad. Its economic benefit such as the less input and higher output is obvious. But its application comes with many difficulties, such as: shallow buried, high build rate while drilling, uncontrollable deflecting law of drilling in large hole in unconsolidated formation and difficulties to guarantee the high build-up rate. It is difficult to running large size casings in to the hole because of short vertical section, light weight of the string, high curvature of the borehole, large rigidity of the casings, and the high friction produced by bending deformation casings. It requires high-accuracy well trajectory control due to small vertical depth and well section adjusting margin. Therefore, all above the difficulties need to solve, and it is necessary to carry out the project research on this subject.Focusing on the difficulties in horizontal well drilling and completion technology of shallow oil and gas reservoir, this essay describes the the following aspects of research: the optimum design of well trajectory; the research on torque and drag reduction technology through the analysis of forming mechanism of torque and drag; the development of supporting tools through the theoretical research of the deflecting mechanism and influence, and the research on deflecting in shallow formation technology; the analysis of borehole cleaning mechanism and the development of supporting tools, and the research on cuttings remove technology; through the mechanical analysis, developping supporting tools and completing research on running completion casings.Based on theoretical research, and combining with the needs of the construction site, the relevant supporting tools were developed. Verified by laboratory and field tests, some difficulties in shallow horizontal well drilling and completion were targeted to solve.