Geosteering Used In Ghuanghua Block In Jianghan Oil Field

With the development of the international petroleum engineering, the technology of high angle deviated well,branch hole and horizontal wellis becoming more and more in use of develop oil reservoir which have the distinguishing feature:lesser, scale, bad physical property, bigger coefficient of anisotropy. Because of its own features, the technology of geosteering is becoming more and more accepted by foreign and domestic companies.As a technology of new pattern technology for drilling, the technology of geosteering is in wide application.When drill horizontal well, how to ensure the right location of the targrt stratum and control the well course thread in targrt stratum is a bottleneck problem in develop the complex reservoir and oil sheet. which is also a technique trouble of our country’s geosteering nowadays.In this article, we set Guanghuablocks of jianghan oilfield as the background and geology, seismic, well-logging, logging and drilling material as the fundament, focus on the problems in study, collect many data, from logging interpretation of comprehensive, rock mechanics and broken rock drill mechanism as the theoretical basis, natural gamma ray logging lithology of the classification of the value of a basis in full consideration and stratigraphic lithology closely related to the effects of parameters can be used to measure the factors, select the drilling pressure, rotational speed, the pump pressure, drilling, drilling way when the important parameters as lithology discrimination, combined with the breath of comprehensive logging the logging data, consider zero long influence and mud scattered the influence of the relative gas logging, using BP neural network to establish the corresponding lithology strata discriminant model and pore fluid properties discriminant models with drilling stratigraphic lithology discrimination and oiliness discrimination, according to block the remaining oil distribution, Guanghua wide range of Eq13and Eq43in geological orientation method research group.Through the study of technology of geosteering, receive some achievement which is as followed:1、Based on exploration geology, well-logging, drilling material we set up a suitable geosteering method for Guanghua blocks of jianghan oi lfield, and choose the appropriate marker bed.2、To use well-logging as the basis, and GR as the important for lithologic discrimination supplement, Comprehensive consideration of the rock argillaceous content and porosity of rock mechanics parameters, and the influence of probability and statistics, based on BP neural network as the mathematical method, and logging data in combination with drilling parameters of drilling strata in real-time evaluation.3、On the base of analyzing drilling material, we conclude model which is suitable for the.drill horizontal well in Guanghuablocks of jianghan oil field.In the project of G2P7in Guanghua blocks of jianghan oil field.,we offerz the technical support in usage of the achievement above.In this well, design the horizontal hole section is145.62m, Through the research results to optimize technology, the actual horizontal hole section is3.4m,for well-logging,the effective of horizontal hole section in reservoir is160m, and perforation, output per day5TWhat’s mentioned in this article has a great effect in Guanghua blocks,compared with the lashorizontal well, the use of formation evaluation course for lithologic discrimination is faster and more accurate,used of model for contol well course horizontal well drilling process, the hole trajectory more accurate in destination landing, and adjust the hole trajectory parameters in the goal through layer, reservoir overall ascension through rate above30%.Especially Guanghua blocks of jianghan oil field. which does have a good result.