Abstract: Our oil and gas industry is faced with many new challenges in 21st century. Comprehensive evaluation of oil and gas drilling technology is very important to scientific and reasonably lay out our science and technology development strategy in oil and gas industry. Considering the characteristics of oil and gas technology, a technical evaluation index system was established. The weight of each index was obtained by the weight factor decision method. Its calculation is simple and practicable. A new method of multi-index omprehensive evaluation(i.e. the principal component projection method) was applied to evaluate fourteen oil and gas drilling technologies. The application results indicated that it is feasible.

Key words: oil and gas drilling, technology evaluation, the principal component projection method, weight, weight factor decision method