Wellbore characteristic of gas drilling in thicker conglomerate

doi:10.7623/syxb201503013

Acta Petrolei Sinica ›› 2015, Vol. 36 ›› Issue (3): 372-377.DOI: 10.7623/syxb201503013

• Petroleum Engineering • Previous Articles Next Articles

Wellbore characteristic of gas drilling in thicker conglomerate

Di Qinfeng¹, Wang Chunsheng², Li Ning², Wang Wenchang¹, Feng Shaobo², Wang Yanming², Liang Hongjun²

1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;
2. PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China

Received:2014-04-22 Revised:2014-12-02 Online:2015-03-25 Published:2015-03-11

巨厚砾岩层气体钻井井眼特征

狄勤丰¹, 王春生², 李宁², 王文昌¹, 冯少波², 王延民², 梁红军²

1. 上海大学上海市应用数学和力学研究所上海 200072;
2. 中国石油塔里木油田公司新疆库尔勒 841000

通讯作者: 王文昌,男,1982年5月生,2003年获兰州大学理论力学专业学士学位,2011年获上海大学工程力学专业博士学位,现为上海大学讲师,主要从事石油工程中的管柱力学问题研究。Email:wangwenchang1982@163.com
作者简介:狄勤丰,男,1963年8月生,1984年获华东石油学院钻井工程专业学士学位,1997年获西南石油学院油气井工程专业博士学位,现为上海大学教授、博士生导师,主要从事石油工程技术和力学问题研究。Email:qinfengd@sina.com
基金资助:
国家自然科学基金项目(No.51174130,No.50674065)、上海市重点学科建设项目(S30106)、上海领军人才基金项目和上海市优秀学术带头人项目(12XD1402500)和国家重大科技专项(2011ZX05046)资助

Abstract

Abstract:

As compared with conventional drilling techniques, gas drilling presents many advantages and has been attracting more and more attention in China. It is an emerging and drilling acceleration technology, for which there still exist some special problems when applied in the mining industry, i.e., difficulties in well deviation control and resistance in running casing during the drilling of thick conglomerate layers. When the air hammer and pendulum drill-string technique are applied to develop thick conglomerate layers in the piedmont belt of Tarim Oilfield, well deviation can be hardly controlled, and a large resistance is also encountered in running casing. Based on the measured borehole diameter data, the shape feature of borehole cross section was reconstructed using the cubic spline curve. Meanwhile, this study explored the formation mechanism of the elliptic borehole drilled by air hammer. The results show that air hammer can destroy rocks through high-frequency drilling, and highly elliptical boreholes are formed under the effect of reservoir heterogeneity and anisotropy. The average diameter of 431.8 mm borehole is 495.3 mm, and the long and minor axis is 551.2 mm and 427.7 mm respectively. The short minor axis and irregular shape of boreholes lead to the resistance in running casing. Aiming to promote the application of gas drilling technology in developing the thick conglomerate layers of Tarim Oilfield, it is required to not only effectively control the well deviation, but also increase the length of minor axis. The drilling practice of Bozi A well indicates that pre-bending pendulum assembly can be used to better control the well deviation, adjust the cross-sectional shape of borehole, and smooth the borehole wall.

Key words: thick conglomerate layer, gas drilling, borehole reconstruction, cubic spline curve, six-arm logging

摘要：

由于具有常规钻井所不具备的多方面优势,气体钻井技术在中国正受到越来越多的关注。作为一项打开油气层新技术和提速技术,气体钻井技术在矿场应用中存在一些特殊问题,包括巨厚砾岩层提速钻井中井斜控制难和套管下入遇阻现象。现有的空气锤和钟摆钻具组合控制井斜方法在塔里木油田山前巨厚砾岩层中都很难起到很好的井斜控制效果,而且套管遇阻情况严重。基于实测井径数据,利用3次样条曲线重构井眼截面形状特征,并探讨巨厚砾岩层空气锤钻井椭圆井眼形成机理。结果表明,空气锤以高频冲击破坏岩石,受地层的非均质性和各向异性的影响,所形成的井眼体现为高度椭圆性。431.8 mm井眼的平均井径达495.3 mm,长轴达551.2 mm,而短轴仅为427.7 mm。正是这种井径短轴偏小和井壁不规则造成了套管下入遇阻问题。为了在塔里木盆地山前巨厚砾岩层推广气体钻井技术,不但要有效控制井斜,而且要尽可能增大井眼短轴长度。博孜101井的钻井实践表明,采用预弯钟摆BHA(底部钻具组合)不但可以较好地控制井斜,而且可以有效地改善井径截面形状,提高井壁的光滑度。

关键词: 巨厚砾岩层, 气体钻井, 井眼重构, 3次样条曲线, 六臂测井

CLC Number:

TE21

Di Qinfeng, Wang Chunsheng, Li Ning, Wang Wenchang, Feng Shaobo, Wang Yanming, Liang Hongjun. Wellbore characteristic of gas drilling in thicker conglomerate[J]. Acta Petrolei Sinica, 2015, 36(3): 372-377.

狄勤丰, 王春生, 李宁, 王文昌, 冯少波, 王延民, 梁红军. 巨厚砾岩层气体钻井井眼特征[J]. 石油学报, 2015, 36(3): 372-377.

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Wellbore characteristic of gas drilling in thicker conglomerate

巨厚砾岩层气体钻井井眼特征

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