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China National Petroleum Corporation, Cnpc Drilling Research Institute and Beijing Petroleum Machinery Factory | Date: 2013-06-18

An information transmission apparatus for logging while drilling comprises a hollow drilling rod and at least one cable. The drilling rod comprises at least one first drilling rod member and at least one second drilling rod member spliced to each other alternately. The first drilling rod member comprises a through hole, and the second drilling rod member comprises a stepped hole. The cable comprises a fixed end, a connected end, and a folded portion connect the fixed end to the connected end. Each of the cables is fixed in the stepped hole through a fixed end or is connected to a connected end of an adjacent cable. The connected end may be stretched along the stepped hole, and stretched through the through hole to be electrically connected to a logging instrument or a fixed end of the adjacent cable. The apparatus provides protection for a cable through a hollow drilling rod, thereby improving the transmission reliability.


Gao W.,CNPC Drilling Research Institute | Zhang C.,CNPC Drilling Research Institute | Gao X.,China National Petroleum Corporation | Lin Y.,China National Petroleum Corporation | And 4 more authors.
Society of Petroleum Engineers - SPE Offshore Europe Conference and Exhibition, OE 2015 | Year: 2015

Directional wells and cluster wells have become a conventional drilling technique now, which is widely used in various types of oil and gas reservoirs. Each year, more than half of the total drilling are directional wells in China. The main work is not to aim the target area, but to track the reservoirs now. Geosteering drilling is an important technical approach to improve single-well production and recovery ratio, to achieve the "less wells more production" idea. China Geosteering Drilling System (CGDS), integrated the technology of drilling with logging and reservoir engineering, applies the near-bit geological and engineering parameters as well as controlling method to ensure that the wellhole trajectory can pass through reservoir and get best location while drilling. The wellhole trajectory can be adjusted and controlled timely according to the formation features measured by CGDS. The drilling bit is equipped with "eyes", which can identify oil/gas layer during drilling. Since 2011, we have provided CGDS geosteering services in 29 horizontal wells in Songliao Basin. The total footage reached 18255m, and the longest footage in horizontal section was 1325m in single well, while the average sand penetration rate is above 85%. Comparing with the horizontal wells operated by conventional LWD tools in the same block, the results of the field application shows that the CGDS geosteering system can significantly improve sand penetration rate and substantially reduce the drilling duration. On the basis of introduction to the system, this paper focuses on comparative analysis of significant application effect of CGDS geosteering system for the heterogeneous reservoir in Putaohua Area of Songliao Basin, as well as the lessons learned. Helpful case histories will also be presented. © Copyright 2015, Society of Petroleum Engineers.


Li L.,CNPC Drilling Research Institute | Xu X.,CNPC Drilling Research Institute | Sun J.,CNPC Drilling Research Institute | Yuan X.,CNPC Drilling Research Institute | Li Y.,CNPC Drilling Research Institute
Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2012, ADIPEC 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation | Year: 2012

Nanotechnology has already contributed significantly to technological advances in the energy industries. Nanotechnology has the potential to introduce revolutionary change in drilling industry. Nanotechnology produces nanomaterials with many attractive properties, which can play an important role in intensifying mud cake quality, reducing friction, eliminating differential pipe sticking, maintaining borehole stability, protecting reservoir, and enhancing oil and gas recovery. Recent research has indicated that nanomaterials have special characteristics for a broad range of applications in the fields of drilling fluids and reservoir protection, where fluid loss control, borehole stability, hole cleaning, torque and drag reduction, lost circulation control, and reservoir protection are of interest. This paper presents an extensive literature review of assessing the applications of nanomaterials in drilling fluids and reservoir protection, and evaluates the potential technical benefits that these nanomaterials might provide to petroleum development and production. Copyright 2012, Society of Petroleum Engineers.

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