Studying On Inversion Method And Application Of Logging While Drilling Response

At present, LWD(logging while drilling) have already been the important means of evaluating oil reservoir in the high angle hole, the horizontal well and the multibranch well of slim hole sidetrack. It is also the key technology, which completes the high angle hole and the horizontal well drilling design, the real-time data acquisition and interpretation in well site, and the insitu decision as well as the direction and completes geosteering drilling. LWD can real-time detect to the formation variation in order to promptly make the essential to adjust drilling design, cause drill bit to maximally drill in the hydrocarbon reservoir of the most valuable region. It is vital significance regarding the highly effective development complex hydrocarbon reservoir. However, the original records, which LWD are provided, only reflect some curves of the formation geophysics characteristics, such as formation natural gamma, density, neutron and apparent resistivity parameter of the different detection depth. If the primary data of different detection depth and resolution does not carry on the essential correction of environmental effects, the reliability of the results which provides customer will be bad possibly loses the geosteering action and the formation evaluation significance using LWD.In view of the facts that the measurement results, which LWD gamma, neutron, density and resistivity logging instrumental use presently in oil field, are affected by the instrument eccentricity, the borehole enlargement and inclination of formation (or hole deviation) and so on. The inversion correction models are established. The log response value, which is corrected, is able to really reflect the formation characteristic nearby the drill bit in order to better apply in LWD interpretation analysis.This dissertation take LWD response as the research object, comprehensively utilize LWD data which measured by overseas three big oil companies Bohai sea, South sea in China, Combine with LWD data and the wireline log data, combine with the chart correction and the numerical iteration inversion, and using the many kinds of new method and technology, 5 aspects matched methods and technology have emphatically researched. Including: â‘ Contrast analysis of LWD and the wire line log data; â‘¡Establishment of the numerical simulation method of LWD electricity log response under free hole deviation condition; â‘¢Studying on inversion correction method of LWD gamma, neutron, density and resistivity logging response environmental effect; â‘£Applied project research of formation...