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Near-bit Geosteering Drilling Technology
10/05/2017

Near-bit Geosteering DrillingTechnology
CNPC’s Near-bit Geosteering Drilling Technology provides safe and efficient drilling plan for you!
 
China National Petroleum Corporation (CNPC) is a state-authorized investment agency and a state holding company. As an integrated oil company of cross-regions, cross-industries and cross-countries, it adopts modern enterprise system to realize the integration of upstream and downstream operations, internal and external trade and production and marketing. CNPC has 17 upstream companies, 33 downstream companies and 36 large-scale marketing companies. It is China’s largest producer and supplier of oil and gas, and also one of the largest refined oil products and petrochemicals. In 2010 CNPC produced 105 million tons of crude oil and 72.5 billion cubic meters of natural gas, while crude processing volume reached 135 million tons. The total revenue of RMB1,720 billion with a profit of RMB172.7 billion had been achieved the same year. Its profit is among the highest of the domestic enterprises in China.
 
 
CNPC was ranked 10th in Fortune Global 500 in 2010 and 5th among global top 50 oil companies.
 
CNPC strictly follows by the combined strategies of increasing resource capacity, expanding market shares and consolidating the international role, and persists in regarding technical innovation as a key framework to advance technological progress. To develop its core businesses, focuses will be placed on the solutions of key bottleneck technologies and key proprietary technologies. Thanks to continuously improving of the technical innovation system, optimizing the configuration of technological resources and strengthening the construction of strong talent teams, CNPC’s technological creativity has been considerably upgraded. Consequently, a large number of technologies have been developed independently, with its own intellectual property.
 
The Near-bit Geosteering Drilling Technology is one of representatives for major innovations of CNPC.
 
 
The Near-bit Geosteering Drilling Technology is the new and advanced technology for well drilling in the 21st century commonly acknowledged by the international drilling industry. By integrating machine, electric power, fluidization system, measurement while drilling (MWD), transmission, decision and control of information, the Near-bit Geosteering Drilling System has the functions of “measure, transmission, guiding”, i.e. via measuring geologic parameter and engineering parameter of bit, bidirectional information transmission between downhole and ground, and ground control and
 
decision, which steers a bit to discover on time and exactly drill into hydrocarbon reservoir and keeps relatively high probability of penetration in hydrocarbon reservoir. Thereby the discovery rate and output of oil and gas well are increased and the goal of increasing reserves and output of oil and gas is reached. This kind of preponderance is even more obvious in horizontal well for thin beds, wherefore the technology is called “navigation missile” into the ground by industry participants.
 
China Geosteering Drilling System-1 (CGDS-1) is the drilling equipment whose independent
 
 
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INTRODUCTION

intellectual property is owned by CNPC. In the course of its development, 12 national patents for invention (6 authorizations have been obtained) and 23 proprietary technologies of CNPC are declared. This system could be used to measure 3 geologic parameters of near-bit, 2 engineering parameters of near-bit and 3 controlled variables for well path. Its angle build-up rate conforms to the requirement of long to middle radius, its signal transmission depth is 5,000m and transfer rate of data is 5bit/s.
 
On Dec. 28, 2006, CNPC held the promotio
 
 
conference for China Geosteering Drilling System-1 (CGDS-1). CGDS-1 has been industrialized. Till May 2010 the system has been applied to 28 wells in
 
Jidong, Liaohe, Sichuan, Jianghan oilfields, etc.
 
In May 2009, CNPC obtained the “Certificate of National Independent Innovation Product” for China Geosteering Drilling System-1 (CGDS-1), and obtained the second prize of 2009 National Technology Innovation Award for “Near- bit Geosteering Drilling System and Industrial Application”.
 
CNPC owns two sizes of Near-bit Geosteering Drilling System: CGDS172 and CGDS203.
 
China Geosteering Drilling System-1 (CGDS-1) is composed of CAIMS, WLRS, CGMWD and CFDS.
 
 
1. China Adjustable Instrumented Motor
 
System (CAIMS)
 
From top to bottom, CAIMS is composed of bypass valve, screw motor (i=5/6), cardan shaft assembly, near-bit adjustable instrumented pup joint, surface adjustable bent housing and transmission shaft assembly with near-bit stabilizer.
 
2. Wireless Receiving System (WLRS)
 
WLRS is mainly composed of upper data connection assembly, stabilizer, battery and control circuit coach body, short-range transmission receiver coil and lower adapter. Its top is connected with CGMWD while its bottom with motor.
 
3. China Geosteering MWD (CGMWD)
 
CGMWD is composed of the hardware system of downhole instrument and corresponding software. Downhole instrument system is composed of positive pulse generator (transfer rate reaches more than 5 bit/
 
s), driving controller pup joint, battery container pup joint, direction finder pup joint. The software for downhole instrument is composed of Main Control Module, Orientation Module, Driver Module and Battery Module.
 
4. China Formation/Drilling Software System (CFDS)
 
CFDS is mainly composed of hardware such as Ground Sensor, Front End Receiver and Ground Signal Processing, software such as Data Processing Analysis, Design of Well Drilling Orbit and Steering Decision and modules such as Valuation of Effect, Data Management and Chart Output.
 
 
 
 
Technical Advantages of China Geosteering Drilling System-1(CGDS-1)
 
 
CGDS-1 provides three main functions for measuring, transmission and steering:
 
(1)Measuring near-bit geologic parameters (bit resistivity, azimuthal resistivity, natural gamma) and near-bit engineering parameters (inclination, tool face orientation), near-bit measurement information is transmitted over steerable motor to WLRS with wireless short-range transmission technology.
 
(2)Near-bit measurement information is fit into CGMWD by data connection system assembly,
 
 
the measured downhole information is transmitted to CFDS passing CGMWD as information transfer channel, the measured information is the evidence for steering operation decision.
 
(3) The downhole steering motor (or combination of turntable drill tool) is taken as the implement tool for steering, the downhole measurement information is processed, interpreted, judged, decided by CFDS, and steering tool is directed exactly drilling into oil and gas target stratum or drilling ahead in oil zone.
 
 

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