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常规自然伽玛测井是通过测量地层岩石中3种自然存在的放射性物质发出的γ射线来获取不同的地层信息的,具有能准确识别地层岩性的特点,但是在水平井的施工中,由于国内原有的伽玛无线测斜仪器均为周向测量,不能及时有效地确定层位,在水平段钻井施工过程中,常因为导向错误导致出层,耽误钻井施工周期和降低油气层钻采率。针对这个问题,国内几家有技术实力的仪器公司研制新一代的伽玛随钻测斜仪,其中北京恒泰公司率先推出方位伽玛LWD,该仪器通过与MWD的工具面高低边相结合,能够在复合和滑动钻进过程中,准确判别油气井目的层的边界位置,有助于地质导向工作,根据方位伽玛的数据,可以计算出该地区的地层倾角,有效地指导水平井的钻井施工。该仪器在苏里格油田苏75-71-11H的水平井的应用实践证明,方位伽玛可以作为水平井钻井地质导向的技术支撑,并向全国各油田的水平井施工服务作业中推广。
Conventional Gamma-ray logging can obtain different formation information by measuring the gamma ray emitted by three naturally occurring radioactive materials in the formation rock, and has the characteristic of accurately identifying formation lithology. However, in the construction of horizontal wells, The domestic original gamma wireless inclinometers are all circumferentially measured and can not determine the horizon in a timely and effective way. During the drilling of horizontal sections, often due to misdirection, the formation is delayed, which delays the drilling cycle and reduces the drilling of oil and gas reservoirs rate. In response to this problem, several domestic companies with the technical strength of the development of a new generation of gamma-inclinometer while drilling, of which Beijing Hengtai company first introduced the location of gamma LWD, the instrument by MWD tool surface with high-low side, It is possible to accurately determine the boundary position of the target layer of oil and gas wells during the process of compounding and sliding drilling, which is helpful for geosteering. According to the azimuth gamma data, the dip of strata in this area can be calculated and effectively guide the horizontal well drilling construction. The application of this instrument in horizontal wells of Su 75-71-11H in Sulige Oilfield proves that azimuth gamma can be used as technical support for horizontal well drilling geosteering and is promoted to horizontal well construction service operations of all oil fields in China.