As a result, [X] may incur cost overruns or may be required to curtail, delay or cancel drilling operations because of many factors, including unexpected drilling conditions, pressure or irregularities in geological formations, equipment failures or accidents, adverse weather conditions, compliance with environmental regulations, governmental requirements and shortages or delays in the availability of drilling rigs and the delivery of equipment. [X] often attempts to mitigate this risk by entering into carry arrangements with its joint venture counterparties, pursuant to which one or more such counterparties finance a specified portion of Rosneft’s share of exploration costs in exchange for a priority claim to crude oil and gas produced during a specified period once production commences. Despite such carry arrangements, however, X's overall drilling activity or drilling activity within a particular project area may not discover commercially productive reservoirs.

и что такое "pressure or irregularities in geological formations"?

Спасибо!