Key Technologies for Casing Running with Double Floating Collars in Middle and Deep Horizontal Wells
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摘要:
针对中深层水平井油层套管下入摩阻大、常遇阻，常规机械式漂浮接箍结构和操作复杂及多个漂浮接箍串联使用风险高的问题，从提高漂浮下套管工具的性能、可靠性和管串通过性等方面入手，研制了随通式漂浮接箍和偏心自旋转承压浮鞋，优选了整体无焊缝弹性扶正器和弹浮式浮箍等关键工具，建立了摩阻系数和漂浮接箍位置确定方法，并制定了漂浮下套管的技术措施，形成了适应于中深层水平井的双漂浮下套管关键技术。中江气田9口水平井应用了该技术，套管均安全下至设计井深，漂浮下套管工具承受液柱压力最高达62.5 MPa，漂浮长度最长1811 m。研究和现场应用结果表明，双漂浮下套管技术可以解决中深层水平井油层套管下入困难的问题，为中深层水平井油层套管下入提供了一种新的技术方法。
Abstract:There are problems of excessive drag and restriction while running production casing into medium and deep horizontal wells. In addition, the conventional floating collar has a complex structure and complicated running procedure, and multiple floating collars in series have high risk. In order to improve floating collars' performance, reliability, and the pipe string trafficability of casing running, the immediate rupturing disc floating collar and eccentric self-rotating pressure bearing float shoes were developed, and key tools such as integral non-weld centralizer and elastic floating collar were selected. The determination method for drag coefficient and position of drag floating collar was established, and the technical procedure of casing running with floating collar were created, forming the key technologies for casing running with double floating collars suitable for middle and deep horizontal wells. The technologies have been successfully applied in nine horizontal wells in Zhongjiang Gas Field, and the casing was safely run to the designed depth. The maximum liquid column pressure bearing of the floating collar is 62.5 MPa, and the maximum floating length is 1811 m. The results of research and field application show that the casing running technologies with double floating collars can solve the problem of difficult casing running in middle and deep horizontal wells and provides a new technical method for casing running in middle and deep horizontal wells.
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Keywords:
- floating collar /
- floating shoe /
- casing centralizer /
- drag coefficient /
- casing running /
- horizontal well
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图 2 偏心自旋转承压浮鞋的结构
Figure 2. Structure of eccentric self-rotating pressure bearing floating shoe
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图 6 江沙318-2HF井套管下入过程大钩载荷模拟结果
Figure 6. Hook load simulation results of casing running process in Well Jiangsha 318-2HF
表 1 双漂浮下套管技术在中江气田水平井的应用情况
Table 1 Application of double floating collars in horizontal wells of Zhongjiang Gas Field
井号 完钻井深/m 垂深/m 钻井液密度/（kg·L−1） 水平段长度/m 漂浮接箍I位置/m 漂浮接箍II位置/m 漂浮长度/m 江沙345HF 3 882 2 627 1.95 800 1 350 2 670 1210 江沙318-2H 4 551 2 771 1.95 1504 1 395 2 738 1811 江沙220-2H 3 762 2 732 2.04 818 1 452 2 765 995 回自201HF 3 754 2 770 2.00 859 1 445 2 847 905 江沙340HF 4 020 2 928 2.05 910 1 605 3 006 1012 江沙220-4HF 3 565 2 713 2.06 660 1 444 2 660 903 江沙343HF 3 281 2 428 2.03 626 1 300 2 489 790 新沙24-16HF 3 635 2 544 1.70 855 1 200 2 432 1 201 江沙321-9HF 4 186 3 006 2.09 988 1 750 3 186 998 
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表 2 江沙318-2HF井的实际大钩载荷与计算大钩载荷的对比
Table 2 Comparison of actual hook load and calculated hook load of Well Jiangsha 318-2HF
钻头位置/m 实际大钩载荷/kN 计算的大钩载荷/ kN 0.45① 0.50① 0.55① 3 600 810 871 812 754 3 800 866 931 870 811 4 000 907 968 905 845 注：①为摩阻系数。
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