Well Profile Optimization and Drilling Matching Technology of for Horizontal Wells in Sulige Gas Field

Abstract

The tight gas reservoir in Sulige Gas Field is deeply buried, the problem of formation and leakage during drilling is prominent, and the penetration rate is low. The early horizontal wells adopt the conduit+third wellbore structure, which makes it difficult to achieve the purpose of continuously increasing drilling speed and reducing drilling cost. Analyze that problems exist in the well structure of conduit+third spudding, On the basis of stratum 3 pressure profile, leakage and wellbore stability, and improvement of penetration rate, the optimization idea and feasibility analysis of wellbore structure were carried out, the sealing section was optimized, the wellbore size was optimized, and the second spudding wellbore structure of slim hole was formed. Based on this wellbore structure, the key drilling matching technologies, such as well trajectory control, optimization of personalized drill bits and matching speed-up tools, and optimization of segmentation measures of drilling fluid with strong inhibition and high efficiency lubrication, were studied. The field application proves that the research results are effective, which solves the problem of collapse and leakage coexist, while leakage occurs at the top and occurs at the bottom in long open hole sections, improves the penetration rate of each well section, and greatly shortens the drilling cycle. The field application results show that the structural design of the second spudding of slim hole is reasonable, and the matching drilling technology has been remarkable speeded-up, which can be popularized and applied in horizontal well drilling in Sulige gas field.