滤饼固化剂在元页HF←1井的应用

Application of Mud Cake Curing Agent in Well Yuanye HF←1

为了提高页岩气井的固井质量,在元页HF1井244.5mm套管固井时试验应用了滤饼固化剂。采用元页HF-1井实际使用的钻井液和水泥浆,根据自主建立的固井第二界面胶结强度评价方法,评价了GJ-Ⅰ型滤饼固化剂和GJ-Ⅱ型滤饼固化剂对固井第二界面胶结强度的作用效果。评价结果表明,在分别养护3,7,15和30d的条件下,采用滤饼固化剂的固井第二界面胶结强度比常规固井第二界面胶结强度分别提高了629.03%,222.37%,241.43%和273.33%。现场固井试验后的声幅-变密度测井结果表明,封固段相对声幅值≤15%的井段占全井段的93.49%,固井质量为优质。研究表明,滤饼固化剂可大幅度提高页岩气井固井第二界面胶结强度,可提高页岩气井的固井质量。

To improve the cementing quality of shale gas wells,mud cake curing agent was applied in the well cementing of 4244. 5 mm casing in Well Yuanye HF-1. Based on the drilling fluid and cement slurry used in Well Yuanye HF-1 and API specification 10, the effects of mud cake curing agents（GJ- Ⅰ and GJ-Ⅱ ） on bond strength at cement-formation interface was evaluated by the self-established evaluation method. The evaluation results showed that when the curing time was 3,7,15 and 30 days, compared with cementing without curing agent,the bond strength of cement-formation interface with mud cake curing agent remarkably increased by 629. 03%,222. 37%, 241.43 % and 273. 33 %, respectively. 72 hours after cementing, acoustic amplitude variable density logging （CBL/VDL）was carried out. The logging results showed that the proportion of cementing section with relative acoustic amplitude of less than 15% is 93.49 %, indicating good cementing quality. The study showed that mud cake curing agent could greatly improve the bond strength at cement-formation interface and thus the cementing quality of shale gas wells.