energy conservation concept, mechanism, technology and management.
In 2007, in order to build an energy-efficient enterprise, CNPC attached great importance to optimizing its energy system, improving the energy efficiency of equipment and making an all-out effort to conserve energy and control pollution. Ten Major Energy-saving Projects and Ten Major Pollutant-reduction Projects were fully implemented. CNPC significantly improved its management and integrated use of energy. Throughout 2007, CNPC saved 1.4 million metric tons of standard coal equivalents and 55 million cubic meters of water.
CNPC also attaches great importance to the role of technological upgrading in energy conservation and pollution control. In 2007, CNPC popularized the drilling of horizontal and cluster wells and completed 806 horizontal wells throughout the year, whose output per well is 3-4 times that of vertical wells. As a result, hydrocarbon recovery and land use are more efficient.
CNPC launched associated gas recovery projects in the Tarim and Changqing oilfields in western China. Various recovery measures such as booster and reinjection into reservoirs, casing gas recovery, and gas-fired power generation were taken to improve the integrated use of associated gas resources.
In the same year, CNPC devoted more resources to the R&D of energy-efficient equipment and monitored 8,356 sets of energy-intensive equipment such as boilers, furnaces, pump units, compressor units and transformers, and 37,850 meters of steam pipelines.