摘要
大牛地气田低渗致密气藏,纵向上发育多套气层,且层间跨距较大,储层致密,单层产能不能满足配产要求,为此需要多套气层一起动用,实现合采投产。阐述了大牛地气田地质特征及压裂改造难点,提出K344-113型封隔器分层压裂工艺,并对该工艺的原理、特点及其配套工具进行了详细的说明,其中成功打开滑套是该工艺的技术难点。目前已经运用该工艺在现场试验了31井次,平均单层加砂量47.8 m3,平均单井加砂量119.6 m3,压后平均单井无阻流量7.4×104m3/d,其中单井最大无阻流量20.04×104m3/d,平均单井施工周期12天(两层);与逐层上返工艺相比,不仅缩短了作业周期,同时也大大降低了作业费用,适合在大牛地气田继续推广应用。
Daniudi gasfield is comprised of low-permeability tight gas reservoirs and multiple gas layers with large interlayer space that developed vertically within the tight reservoirs. As the pruductivity of one single layer can hardly meet the requirements of pro- duction allocation, multiple gas layers are utilized together for commingled production. Based on the description of the geological characteristics of Daniudi gasfield and solutions of fracturing problems, this paper proposed layered fracturing technology by using K344-113 packer and made detailed description of the principles, features and supporting tools of the technology, pointing out that opening sliding sleeve is the technical difficulty in operation. So far, the technology has been applied in field trials of 31 wells with 47.8 m3 sand added to single layer on average, 119.6 m3 sand added to single well on average, with the open-flow capacity of single well reaching 7.4 ×10^4m3/d after fracturing on average（of which the largest open-flow capacity of single well reaching 20.04×10^4m3/d） and with the operation period of single well reaching 12 days （two layers） on average. Compared with layered upward technolo- gy, the new technology not only shortened the operation period but also greatly reduced the operation costs. As a result, the continuous popularization and application of the technology in Daniudi gasfield is recommended.
出处
《油气藏评价与开发》
2011年第4期56-60,共5页
Petroleum Reservoir Evaluation and Development
