﻿ 钻头钻削桥塞过程受力分析与试验研究

1. 东北石油大学机械科学与工程学院, 黑龙江大庆 163318;
2. 中国石油大庆油田有限责任公司井下作业分公司, 黑龙江大庆 163453

Force Analysis and Test of Bridge Plug Drilling
LAN Chengyu1,2, DING Yuqi1, LIU Jubao1, DAI Ziwei1, ZHOU Huiyu1, LIU Yuxi2
1. College of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China;
2. Downhole Service Company, PetroChina Daqing Oilfield Co. Ltd., Daqing, Heilongjiang, 163453, China
Abstract: To quantitatively control weights on bit(WOBs) and torques of the coiled tubing bit in the drilling of a bridge plug, and to eliminate problems related to oversize cuttings during the process, mechanical analyses were performed for the cutting of the compound bridge plug.By constructing the mechanical model for the cutting of bridge plug by the coiled tubing bit, the relationships among WOBs, drilling depths, torques and cutting volumes were analyzed to derive the dynamic equation for WOBs, torques and cutting depths.To confirm the accuracy of relevant calculation results, field tests were conducted in two wells to drill 9 bridge plugs.Test results showed the maximum relative error between calculation result and field application result was 15%, which was sufficient to satisfy accuracy demands at the expected plug-drilling depths.Research results showed the newly derived mechanical analyzing model for coil tubing bit to cut bridge plug could accurately high light correlation among WOBs, torques and cutting depths.The model is great significance to control the WOBs and torques in bridge plug drilling.
Key words: coiled tubing     bit     bridge plug     weight on bit     torque     cutting depth

1 钻头整体钻削桥塞过程受力分析

 图 1 钻头整体钻削桥塞受力分析 Fig.1 Stress on the drill bit during the drilling of the bridge plug

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2 单个切削齿钻削桥塞过程受力分析 2.1 切削齿钻削桥塞的进给力计算

 图 2 切削齿压入桥塞时的受力 Fig.2 Stress on the cutting teeth during pressing into the bridge plug
2.1.1 桥塞在进给力作用下压入分力的求解

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2.1.2 桥塞在进给力作用下的切削深度计算

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2.2 切削齿钻削桥塞的切削力计算

 图 3 切削齿切削桥塞时的受力 Fig.3 Stress on cutting teeth during the cutting of the bridge plug

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3 钻削桥塞现场试验

3.1 钻削试验概况

 试验井 桥塞编号 坐封深度/m 1号井 1-1 2 078.60 1-2 2 319.70 1-3 2 555.70 1-4 2 796.10 1-5 3 038.80 2号井 2-1 2 054.90 2-2 2 300.60 2-3 2 779.00 2-4 2 779.00

 桥塞部件 抗压强度/MPa 弹性模量/GPa 泊松比 剪切强度/MPa 中心管 320.57 19.71 0.42 66.60 卡瓦与楔形体 258.30 17.07 0.26 55.47 保护罩 312.18 18.49 0.41 60.25 底座 341.79 7.40 0.21 38.99
3.2 钻削试验数据分析

 图 4 钻压-时间曲线 Fig.4 WOB-time curve
 图 5 钻削深度-时间曲线 Fig.5 Drilling depth-time curve

3.3 试验结果与理论计算结果对比

 图 6 实测与理论计算的钻压-钻削深度对比 Fig.6 Comparison of WOB-drilling depth (measured -theoretical)

4 结论

1) 分析了钻削桥塞过程中钻头与桥塞的受力状态，将钻头的钻压和扭矩分解成作用到桥塞表面的进给力和切削力，并建立了切削齿进给力与钻压、切削力与扭矩之间的力学关系式。

2) 分析了桥塞在切削齿作用下的受力，综合考虑复合桥塞的材料性能，建立了进给力与压入深度、切削力与切屑之间的力学方程，实现了钻压、扭矩与桥塞钻削深度之间的定量描述。

3) 对比分析了2口井共计9个桥塞的钻塞试验数据与理论计算结果，实测和理论计算的钻压与钻削深度最大相对误差为15%，说明建立的钻压和扭矩与钻削深度之间的力学关系可指导现场钻塞施工。

 [1] 来国荣, 安崇清, 范琳沛. 水平井连续油管钻磨桥塞技术分析及应用[J]. 石油工业技术监督, 2016, 32(1): 54–57. LAI Guorong, AN Chongqing, FAN Linpei. Analysis and application of coiled tubing bridge plug drilling and grinding technology for horizontal well[J]. Technology Supervision in Petroleum Industry, 2016, 32(1): 54–57. [2] 张文志. 大庆油田水平井复合桥塞钻磨工艺技术研究与应用[J]. 内蒙古石油化工, 2014, 40(12): 109–110. ZHANG Wenzhi. Research and application of compound bridge plug drilling and grinding technology for horizontal well in Daqing Oilfield[J]. Inner Mongolia Petrochemical Industry, 2014, 40(12): 109–110. DOI:10.3969/j.issn.1006-7981.2014.12.047 [3] VIRUES C, WANG A, PYECROFT J, et al. Performance of plugless toe stages and non-isolated wellbore in multi-stage hydraulic fractured 10 well half pad in the Canadian Shale Gas Horn River Basin[R]. SPE 179128, 2016. [4] 刘威, 何青, 张永春, 等. 可钻桥塞水平井分段压裂工艺在致密低渗气田的应用[J]. 断块油气田, 2014, 21(3): 394–397. LIU Wei, HE Qing, ZHANG Yongchun. Application of drillable bridging plug staged fracturing technology for horizontal well in low permeability and tight gas field[J]. Fault-Block Oil & Gas Field, 2014, 21(3): 394–397. [5] Asaad Mohamed Negm, Ahmed Bahgat Al Kholy, Ahmed Abdulla Al Mutawa, et al. Pioneer step in securing gas well with through tubing retrievable bridge plug under highly complex circumstance (1st time in the Middle East)[R]. SPE 166780, 2013. [6] 尹丛彬, 叶登胜, 段国彬, 等. 四川盆地页岩气水平井分段压裂技术系列国产化研究及应用[J]. 天然气工业, 2014, 34(4): 67–71. YIN Congbin, YE Dengsheng, DUAN Guobin, et al. Research about and application of autonomous staged fracturing technique series for horizontal well stimulation of shale gas reservoirs in the Sichuan Basin[J]. Natural Gas Industry, 2014, 34(4): 67–71. [7] 尚琼, 王伟佳, 王汤, 等. 连续油管钻复合桥塞工艺研究[J]. 钻采工艺, 2016, 39(1): 68–71. SHANG Qiong, WANG Weijia, WANG Tang, et al. Research on milling technology of one CP through CT[J]. Drilling & Production Technology, 2016, 39(1): 68–71. [8] MITTIGA V, MARTOCCHIA F, CARPINETA G, et al. Multi frac in horizontal HT wells: plug and perf technique application on sandstone gas reservoir, onshore Pakistan[R]. IPTC 17995, 2014. [9] 逄仁德, 崔莎莎, 韩继勇, 等. 水平井连续油管钻磨桥塞工艺研究与应用[J]. 石油钻探技术, 2016, 44(1): 57–62. PANG Rende, CUI Shasha, HAN Jiyong, et al. Research and application of drilling, milling-grinding techniques for drilling out composite bridge plugs in coiled tubing in horizontal wells[J]. Petroleum Drilling Techniques, 2016, 44(1): 57–62. [10] 席仲琛, 徐迎新, 曹欣. 水平井油管钻磨复合桥塞技术及应用[J]. 石油钻采工艺, 2016, 38(1): 123–127. XI Zhongchen, XU Yingxin, CAO Xin. Composite bridge plug drilling and milling technology by tubing in horizontal well and its application[J]. Oil Drilling & Production Technology, 2016, 38(1): 123–127. [11] 李官华, 伍贤柱, 李朝阳, 等. 四川非常规气田开发主要钻井技术及其应用效果[J]. 天然气工业, 2015, 35(9): 83–88. LI Guanhua, WU Xianzhu, LI Chaoyang, et al. The key drilling technologies in unconventional gas field development in Sichuan and their application effects[J]. Natural Gas Industry, 2015, 35(9): 83–88. [12] 王先兵, 易炳刚, 欧阳伟, 等. 低渗透储层多级架桥暂堵储层保护技术[J]. 天然气工业, 2013, 33(7): 85–89. WANG Xianbing, YI Binggang, OUYANG Wei, et al. Multi-level bridge plugging for the protection of low-permeability reservoirs[J]. Natural Gas Industry, 2013, 33(7): 85–89. DOI:10.3787/j.issn.1000-0976.2013.07.015 [13] 李田军. PDC钻头破碎岩石的力学分析与机理研究[D]. 北京: 中国地质大学(北京), 2012. LI Tianjun. Mechanical analysis and fragmentation mechanism of PDC bits drilling rock[D]. Beijing: China University of Geosciences(Beijing), 2012. http://cdmd.cnki.com.cn/Article/CDMD-10491-1013109997.htm

文章信息

LAN Chengyu, DING Yuqi, LIU Jubao, DAI Ziwei, ZHOU Huiyu, LIU Yuxi

Force Analysis and Test of Bridge Plug Drilling

Petroleum Drilling Techniques, 2018, 46(1): 68-74.
http://dx.doi.org/10.11911/syztjs.2018032