Several foreign firms, including French tire company Michelin and oil servicing firm Wilbros, have left the region because of security problems. 包括法国轮胎公司米其林和石油服务公司威尔布罗斯在内的几家外国公司已经因为安全问题而离开尼日尔三角洲。
To carry out oil production without pollution, a hydraulic control downhole switch for well servicing is developed. 为实现采油井的无污染作业,研制了液控式修井井下开关。
To keep high permeability formations during development of viscous oil and servicing of well, a fine filtering process for completion fluids, slushing fluids and workover fluids must be made. 在稠油开发和油田管理中,为了保持地层的高渗透率,必须对完井液、洗井液和修井液进行细级过滤。