Practice in improving ROP of extended-reach horizontal wells in Aktobe area, Kazakhstan

doi:10.3969/j.issn.1672-7703.2019.03.012

Abstract

Abstract: North Tluwa and Zanazor oilfields under the Aktobe project are located at the eastern margin of the Pre-Caspian Basin. The low-porosity and low-permeability reservoirs in the oilfields are exploited by horizontal wells. To increase the single-well production, the horizontal section is extended from about 400 m to more than 1000 m. However, complicated geological structures and large variations of the boundary and thickness of target layers result in low ROP and footage, only 2.36 m/h and 335 m on average, when a rotary steering tool with an edge detector is used during drilling. In order to improve the drilling efficiency, the BHA (bottom hole assembly) and the rotary speed were optimized depending on the damages of drill bits and the downhole vibration behaviors, and a ROP enhancement technology was developed with a BHA consisting of high-performance PDC bit, rotary steering screw, and near-bit single centralizer or double-centralizer. This technology has been applied in five wells. For four wells, the rotary speed was 60 r/min, the downhole stick-slip index was less 80%, and the drill bits were worn or partially broken. For the rest one well, the rotary speed was 70-80 r/min, the downhole stick-slip index was above 80%, and teeth breaking was mostly observed in bit core. Compared with Well H814, the drilling cycle in the horizontal sections was reduced by 57.7% from 22.5 days to 9.6 days, the average ROP was enhanced by 266.1%, and the average footage was increased by 195.5%.

Key words: Aktobe, abrasive formation, BHA optimization, rotary speed optimization, stick-slip index, ROP

CLC Number:

Zhang Xiaoning, Shi Libao, Bao Chenghu, Sun Dongzhu, Gao Junfei, Li Yanqi. Practice in improving ROP of extended-reach horizontal wells in Aktobe area, Kazakhstan[J]. China Petroleum Exploration, 2019, 24(3): 391-396.

References

[1] Donald H H. A new approach to drilling hard chert contaminated carbonate formation in Kazakhstan[C]. IADC/SPE 139412, 2010.
[2] Wu Xianping, Karuppiah K, Nagaraj M, Partin Uyen, Machado M, Duvvru M F, et al. Identifying the root cause of drilling vibration and stick-slip enables fit for-purpose solution[C]. IADC/SPE 151347, 2012.
[3] Jain J R,Ledgerwood L W,Hoffmann O J,Schewen T,Fuselier D M. Mitigation of torsion stick-slip vibrations in oil well drilling through PDC bit design:putting theories to the test[C]. IADC/SPE 146561,2011.
[4] 徐泓,王涛,黄新成,张庆荣.哈萨克斯坦滨里海油田钻井提速技术[J].石油钻探技术,2013,41(3):89-103. Xu Hong,Wang Tao,Huang Xincheng,Zhang Qingrong.Fast ROP technology in Pre-Caspian oilfield, Kazakhstan[J].Petroleum Drilling Techniques,2013,41(3):89-103.
[5] 章增光,陆成和,李忠明.北特鲁瓦油田复杂地层PDC钻头优选及应用[J].油气开采,2016,42(10):16-19. Zhang Zengguang,Lu Chenghe,Li Zhongming. Optimization and application of PDC bit in complicated stratum of North Troy oilfield[J]. Oil and Gas Production,2016,42(10):6-19.
[6] 李万军,周海秋,王俊峰,陈忠祥,刘江波,顾亦新.北特鲁瓦油田第一口长水平段水平井优快钻井技术[J].中国石油勘探,2017,22(3):113-118. Li Wanjun,Zhou Haiqiu,Wang Junfeng,Chen Zhongxiang,Liu Jiangbo,Gu Yixin.Application of optimized and fast drilling technology to the first long horizontal-section well in North Tluwa oilfield[J]. China Petroleum Exploration,2017,22(3):113-118.
[7] 汤历平.深度硬地层钻头粘滑振动特性及减震方法研究[D].成都:西南石油大学,2012:1-10. Tang Liping. The study on stick-slip vibration of bit in deep and hard formation and method of reduce vibration[D]. Chengdu:Southeast Petroleum University,2012:1-10.
[8] Mohamed N B,Tan J H P,Hasmatali D,Ming L K,Heisig G.Promising results from first deployments of rotary steerable technology in Vietnam basement granite[C]. IADC/SPE122690,2009.
[9] Clausen J R,Schen A E,Forster I,Prill J,Gee R. Drilling with induce vibrations improves ROP and mitigates stick/slip in vertical and directional wells[C]. SPE168034,2013.
[10] Mark H,Dan B,Fred T,Allen K.Self-adapting bottom-hole assembly vibration suppression[C]. SPE166071,2013.
[11] Mario B,Julio M,Martin G,Oscar R,Gerardo L,Joal P T.Mitigating vibration with roller reamer technology improves drilling efficiency in hard/abrasive formation,Sao Francisco Basin, Brazil[C]. SPE169249,2014.
[12] Wassel Mark, Stroehlein B. Method of establishing vibration limits and determining accumulative vibration damage in drilling tools[C]. SPE135410,2010.
[13] Dykstra M W,Schneider B V,Mota Jose.A systematic approach to performance drilling in hard rock environments[C]. SPE139841,2011.
[14] Bowler A,Lpgesparan L,Sugiura J,Jeffryes B,Harmar R,Ignova M.Continuous high-frequency measurements of the drilling process provide new insights into drilling system response and transitions between vibration modes[C]. IADC/SPE 170713,2014.
[15] Chatar C,Blyth M B.Effective BHA design and vibration modeling for improving the quality of sonic measurements[C].SPE140326,2011.
[16] Branscombe E A. Investigation of vibration related signals for monitoring of large open-pit rotary Electric blast hole drills[D]. Kingston:Queen's University, 2010.
[17] 查青春.钻柱系统粘滑振动及涡动分析[D].成都:西南石油大学,2013:1-2. Zha Qingchun.Analysis of torsion and stick-slip of drilling string system[D]. Chengdu:Southeast Petroleum University,2013:1-2.
[18] Bashmal S M.Finite element analysis of stick-slip vibrations in drilling strings[D]. Dhahram:King Fahd University of Petroleum & Minereals,2005.
[19] Bayliss M T,Panchal N,Whidborne J F. Rotary Steerable directional drilling stick-slip mitigation control[C]. Proceedings of the 2012 IFAC Workshop on Automatic Control in Offshore Oil and Gas Production,Trondhelm,Norway,2012.
[20] Tang Liping,Zhu Xiaohua,Shi Chengshuai,Tang Jian,Xu Daping. Study of the influences of rotary table speed on stick-slip vibration of drilling system[J]. Petroleum,2015,1(4):382-387.