| | | Well Logging and Mud Logging | | CNPC has well-equipped and experienced well logging crews that are capable of providing services in logging, perforation, compound logging, date processing and interpretation as well as reservoir evaluation under various geological and engineering conditions. | | | Taking advantage of state-of-the-art image logging, digital logging, perforation, compound logging devices and a variety of software applications, we can carry out well logging operations even under difficult conditions. A number of proprietary or unique techniques regarding logging and perforation of extended reach wells, horizontal wells, slim hole sidetracked wells and underbalanced wells, as well as tool fishing from complex wells. | | | | Fast well-logging technologies, along with well and mud logging equipment with our independent intellectual property rights got widely applied, which shortened the well-completion period and improved operational efficiency. The independently developed LEAD2.0 processing and interpretation software that integrated multiple functions in one system can be used in association with EILog-05 logging unit to interpret logging data of low-porosity and low-permeability sandstone reservoirs, and to identify and evaluate water-flooded formations, low-resistance reservoirs, fractured reservoirs and gas reservoirs. An array induction imaging logger, as well as our Snow Wolf and Dema mud logging units, have been developed and used in production, helping to identify reservoirs and improve drilling performance. | | | CNPC has rendered quality services in well logging, mud logging and testing for Shell, PDVSA, NIOC and ADDAX, etc.
As of 2010, CNPC has 675 professional logging crews, including 121 imaging logging equipment and 311 high-precision logging equipment. Throughout the year these crews completed 80,319 instances of well logging and perforation and 10,133 instances of mud logging.
In 2010, our overseas projects saw smooth progress. In addition to entering the offshore logging market of Iran, our logging projects in Uzbekistan and Mongolia were endorsed by our partners.In 2010, we developed, domestically made and deployed 200 imaging logging units of five types (3 of the electric and 2 of the sonic category), and 26 logging-while-drilling (LWD) units for formation evaluation. In addition, we signed a sales and technical service contract of MCI5570 micro-resistivity scanning instrument with Russia’s TNG. This was the first export of Chinese-made equipment of this kind into the Russian well logging market.
We independently developed the well logging system LEAP800, which embodies world-leading technologies. LEAD3.0, our next-generation integrated platform for well logging, was put into service in 2010, and has efficiently and accurately processed the completion data of more than 440 wells in Changqing Oilfield. Field tests indicated that the average processing and interpretation time per well is shortened by 2-3 hours as compared to other existing products in China. Comprehensive mud logging unit Snow Wolf and Dema (which contain our independent intellectual property) have been used in 12 domestic oilfields and 7 foreign countries.
Wire-line completion logging in high-angle well
Well BEL-Z-1 is a high-angle well in Algeria. We successfully completed a 10-hour well logging operation to solve the problems of sticking risks with a depth of about 2,300m and a maximum slant of 53 degrees.
Electric imaging well logging in the ultra-long horizontal well section
Well L-620 is a horizontal well operated by Shell in Oman. Mud loss was observed in the drilling process and electric imaging well logging was susceptible to instrument sticking and cable failure due to the ultra-long horizontal well section.
We successfully completed a 40-hour well logging operation to solve the problems of data prolongation and compression with a horizontal measurement length of 1,200 meters.
Testing of well Ahwaz-307 in Iran
Well Ahwaz-307 is located in southern Iran with a completion depth of 5,158 meters. Massive mud loss, high flowing pressure and high temperature at wellhead and bottom hole and the presence of hydrogen sulfide were observed during the drilling.
CNPC was awarded the project in March 2006. A five-layer testing was successfully carried out in well Ahwaz-307 within 15 hours at a ground fluid temperature of 113℃ based on effective countermeasures such as string stress analysis and wellhead pressure control.
Perforation ignition monitoring at well Lundong-1
Well Lundong-1 is located in the Tarim Basin with a well depth of 7,620 meters. The test while perforating involved an intricate string structure, a perforation interval of 7,141-7,180 meters, the maximum bottom hole temperature of 160℃, and late ignition of pressurized nitrogen injected through the drill string, making it quite difficult to monitor the ignition of perforation.
A newly developed TCP perforation gun monitor was used to identify the firing time of the perforation gun accurately by analyzing the characteristics of the monitoring curve. The client was informed of the exact firing time which helped to record the firsthand formation testing data. | | | | | | |
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