ZH68-10L Well Optimized Drilling Design And Application

The large displacement well drilling technology, in the development of marginal oil field, especially in the development of offshore oil, coastal beach in China, has a very broad application prospects. Production equipment, the existing land use effective device, make full use of large displacement well drilling technology, which can effectively implement the development of the peripheral oil fields, can save the expensive cost of offshore oilfield development, also has opened up a new way to effectively develop some small fault block oilfields, marginal oilfield, it has very good broad application.ZH68-10L well is the company of Dagang Oilfield offshore development company organization of Chenghai oilfield large displacement well, which draw on the successful experience of large displacement well Xijiang oilfield, comZH-Xed with the characteristics of Chenghai oil itself, the formation and development of large displacement horizontal well drilling technology suitable for the Chenghai oil, but also for the whole Chenghai oil follow-up the development of large displacement wells has accumulated valuable experience.Based on large displacement well drilled in the Chenghai oil field on the experience and lessons, analysis, research and summary of key technologies associated with drilling extended-reach drilling. To appear the ZH68-10L well drilling problems, specifically for the following research:(1) Trajectory optimization compared to choose reasonable, in accordance with the overall arrangements and requirements of exploration and development of oil, according to the structural characteristics and oil reservoir and gas occurrence, enhance oil production and recovery of well trajectory design goals. In determining the design parameters and its variation range basis, according to the target and build curve of different types, design parameters to be determined are slightly different, the design of a series of horizontal well trajectory; calculation of each track borehole length and different conditions of friction torque; selected the optimal orbit.(2) Based on the formation characteristics of known knowledge, comZH-Xed with the actual situation has been around the drilling of suction pressure coefficient, pressure coefficient, excited burst pressure safety factor, well kick Yun and differential pressure sticking to allow to calculate values of these basic coefficient. To determine the economic, reasonable casing program and casing setting depth. (3) the analysis of different strata of rock broken rock bit relative impedance or resistance of rock drilling and drilling and rock breaking capacity. Combined with the drilling and logging data has been around the optimum bit.(4) based on the deep structure of different section of BHA selected by comparison, select advanced technology should be responsible for the wells, improve production efficiency.(5) the design and arrangement of drilling pump adopt the drilling each section work parameters, drill bit and the hydraulic parameter of hydraulic parameters. For the reasonable matching, making the bottom of hydraulic energy optimal allocation on the bottom, so as to achieve optimal purifying effect, improve the mechanical drilling speed.Horizontal displacement well drilling technology research, and summarizes the paper, through the ZH68-10L well site construction site optimization of various parameters, finally draws the suitable for the optimization of drilling parameters in the region. To provide the experience and reference for large extendedreach follow-up, to provide the necessary basis and reference for China offshore and onshore oilfield successful application of extended reach drilling technology.