瑞典是一个石油与天然气资源比较贫乏的国家。近年来探明的石油、天然气大多是浅层的,而且储量不大。过去,瑞典的一些石油勘探开发公司曾用美国进口的陆地石油钻机打勘探井或生产井。但不久即发现:与瑞典的石油天然气蕴藏量的实际情况相比(即大多数为浅层、储量不大),使用通用的大口径石油钻机钻进费用太高,经济效果欠佳。为了降低钻进费用,瑞典TGB公司 Sweden is a country with poorer oil and natural gas resources. In recent years, proven oil and gas are mostly shallow, and reserves are not. In the past, some oil exploration and development companies in Sweden used to drill or production wells onshore oil rigs imported from the United States. Shortly afterwards, it was found that the drilling cost is too high and the economic performance is not good, compared with the actual situation of Sweden’s oil and gas reserves (mostly shallow and small reserves). In order to reduce drilling costs, Sweden TGB company