Because it is necessary to increase the area of lacustrine and increase the production capacity of oil wells, horizontal wells, horizontal branch wells, and large wells are widely promoted in oil fields. If only the cable measurement technique is used in the drilling process, the deviation of the drill bit from the design drilling trajectory can easily occur, resulting in accidents such as the drilling of the partial target and the failure of the drilling process to reach the geological target layer, and the coring error caused by the depth error during drilling.
Drill-through measurement is a comprehensive technical system for cable measurement, logging, and drilling. It can accurately and in real time provide site engineering technicians with physical parameters of rock and geology that meets the formation, which helps the staff to monitor the formation and understand the formation. The situation.
The advantages of on-site construction and data acquisition while measuring while drilling
Because the flow of mud in the well will erode the well wall, the diameter of the wellbore will be close to the diameter of the drill bit when the drill bit is drilled during drilling, and the wellbore will be quickly destroyed. The longer the formation is drilled, the more erosion of the wellbore occurs. Measurements performed while drilling in recent years have shown that in a typical drilling environment, the borehole diameter measurement is only really close to the borehole diameter within the first few minutes after drilling, meaning that the wellbore is within the first few minutes of drilling. It cannot be destroyed. The original traditional cable measurement was generally performed after the reservoir was drilled for ten hours. At this time, the wellbore erosion was severe, and the mud volume around the measuring instrument was too large. In order to reduce the results of the mud impact measurement, generally the thrust was applied. Or the centralizer measures, but it is easy to cause measurement errors caused by borehole wall erosion due to borehole erosion, and mud filtrate in the wellbore has infiltrated into the reservoir under the pressure difference. In the layer, the liquid in the pores of the original reservoir is replaced, resulting in pollution and damage to the reservoir to some extent, and the strata information measured by the cable measurement at this time cannot truly reflect the original stratum information. Measurement while drilling at the near-bit location can be seen as simultaneous measurement process and mud filtrate intrusion, so strata information not available in the measurement while drilling, can basically reflect the original formation information.