丘东27井长封固段固井实践  

LONG ISOLATION INTERVAL CEMENTING PRACTICE IN WELL QIUDONG-27

作　　者：钟福海[1] 王维清[1] 杨声贵[1] 张伟[1] 梁鹏飞[1] 刘联军[2] 

机构地区：[1]华北石油管理局固井工程处,河北任丘062552 [2]长庆石油勘探局工程技术研究院,陕西西安710021

出　　处：《石油钻采工艺》2003年第6期20-22,共3页Oil Drilling & Production Technology

摘　　要：现场固井施工中 ,一般水泥封固段长 80 0～ 12 0 0m ,而丘东 2 7井由于构造断层多 ,地下情况复杂 ,要求一次水泥封固段长达 3 12 5m ,这在以往的固井施工中极为罕见。由于长封固段固井时 ,井底流动温度与水泥浆返回处的静止温度差异较大 ,会造成水泥面处的水泥浆凝固不好 ,甚至长期不凝固 ,严重影响固井质量 ;长封固段固井将会大幅度地增加井底液柱压力 ,固井时极有可能发生漏失。通过大量室内试验 ,采用 2种水泥浆体系进行固井 ,上部井段采用适用温度范围宽的低密度矿渣浆体系 ,下部井段采用常规密度水泥浆体系 ,并辅以适当的固井施工措施 ,克服气候极冷等诸多困难 ,固井一次成功 ,固井质量优质 。Cementing isolation interval usually ranges between 800～1200 m, while in Well Qiudong-27, 3125m long of isolation interval is required due to faulted structure and complex downhole conditions, which makes the operation extremely d ifficult. For long isolation cementing, due to the large temperature difference between the downhole flowing temperature and the static temperature at the cemen t top, poor cementation will be caused, and this severely affected the cementing quality; at the same time, long isolation cementing will also increase the bott omhole hydraulic pressure remarkably, thus cause lost circulation during cementi ng. Large scale of laboratory tests were conducted, and 2 types of cement slurry systems were selected for cementing; specifically, light weight slag slurry of wide temperature range was selected for the upper interval, while conventional c ement slurry was used for the lower interval, and proper cementing measures were adopted. The cementing job for this well was successful, and excellent cementin g quality was achieved.

关 键 词：丘东27井 长封固段 固井实践 水泥浆体系 性能参数 固井技术 

分 类 号：TE256[石油与天然气工程—油气井工程]