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随着水平井技术开发超稠油油藏实施规模的不断扩大,水平井水平段动用不均的矛盾逐渐加剧。分析认为,水平井完井工艺和注汽管柱工艺不完善,是造成水平段注汽不均、从而导致动用不均的两个主要原因。根据水平井水平段储层沿程物性差异分布特点,在水平井完井时采用分段完井技术,在水平段中间物性差井段下入封隔器,将水平段筛管外与油层裸眼之间分隔成两段独立的井段腔室,并在紧挨封隔器位置下入扶正器,保证筛管在裸眼井段居中下入。注蒸汽时,依据井温监测资料判断水平段动用状况,实施双管注汽工艺技术,采用内、外管双注汽管柱注汽方式,分别对水平井水平段跟端和指端部位同时注汽,井口配套工具采用双四通、双悬挂器,同时应用等干度分配器,实现双管柱内的蒸汽流量灵活控制及等干度分配,实现水平段前后井段同时均匀注汽,调整水平段动用程度。
With the continuous expansion of the implementation of horizontal well technology in the development of ultra-heavy oil reservoirs, the contradictions in the uneven utilization of horizontal wells gradually increase. Analysis shows that the completion of horizontal wells and steam pipe string imperfections, is caused by uneven horizontal steam injection, resulting in uneven utilization of the two main reasons. According to the distribution characteristics of physical properties along the horizontal well horizontal section, the section well completions technology is used in completion of the horizontal well, the packer is inserted into the poor section in the middle section of the horizontal section, Separated into two separate sections of well chamber, and close into the packer position into the centralizer, to ensure that the sieve in the open hole in the middle of the hole. Steam injection, according to the temperature monitoring data to determine the status of the horizontal section of the implementation of double-pipe injection technology, the use of double-injection steam pipe inner and outer tube steam injection method, respectively, horizontal wells with the end of the horizontal section and the finger tip at the same time Steam injection and wellhead supporting tools adopt double four-way and double-hanger, meanwhile use dryness distributor to realize flexible control of steam flow rate and equal dryness distribution in double-column, Adjust the horizontal section of the degree of use.