Underbalanced Drilling Techniques Research In Buried Hill Reservoir In Huabei Oilfield

Underbalanced drilling is in bottom hole pressure less than formation pressure during drilling, underground fluids in a controlled manner into the wellbore and circulating drilling technology on the ground. In 1990 s, underbalanced drilling is a new technology of mature in the world and the rapid development of drilling. In American, underbalanced drilling called the new technology upstream oil industry, has become the hotspot of the development of drilling technology, and more and more in horizontal wells, multilateral wells and slim hole drilling technology combination.This paper optimized the argument for underbalanced from multiple aspects of formation pressure coefficient and pressure control, reservoir protection, cost and so on, selected a suitable for different buried hill reservoir for underbalanced drilling. Study on the development of liquid phase under balanced drilling, according to the buried hill reservoir under balanced drilling on drilling fluid performance requirements, are buried hill reservoir underbalanced drilling medium optimization; to carry out the inflatable study in balance drilling, launches the research analysis, from the laws of parameters under the conditions of the corollary equipment of inflatable, trajectory control; study and formulate the process measures to protect the reservoir; and to carry out the site test and application, and achieved very good results.In this paper, to improve the water gas drilling ability, expand the gas drilling well section, at the same time to realize the effective combination and gas drilling and underbalanced horizontal well drilling technology, integrated balance of gas under, in order to improve the single well production, speed, efficiency and provide the technical support, to promote the drilling engineering technology of typical demonstration effect, to achieve large-scale popularization and application objective.