Design philosophy and technological capabilities of bottom hole assembly

The methods and means of energy usage reduction and structurally intact coring in long hole drilling are in the spotlight of this study. The best methods to this end are water-jet destruction of rocks and drilling without turning the drill string. These ground rules make a design framework for a bottom hole assembly with a twin-chamber deep hydraulic drilling unit and thin-wall diamond drill bits. The major difference of the twin-chamber deep hydraulic drilling unit from all other known bottom hole hydraulic motors consists in rotation of stator round immobile rotor. The water-jet rock destruction process uses diamond drill bits with split water courses, meant for ring drilling with coring. The bottom hole assembly also includes: a core barrel, a floating core receiver with sliding support and a rotary bushing being in slide contact with a ring core cutter and preserving core from wash and destruction. The bottom hole assembly designed for maximum usage of potential flush fluid energy fed to the rock cutting tool for rotation moment generation and rock destruction is technologically capable to form and remove intact large-diameter cores using a single core barrel. The bottom hole assembly is applicable to drilling holes with diameter from 59 mm to 215.9 mm and more. The lab-scale and field trials of the bottom hole assembly with a twin-chamber deep hydraulic drilling unit allow concluding on the potential efficiency of the equipment in long hole drilling.

Mendebaev T. N., Ismailov H. Kh., Izakov B. K., Smashov N. Zh. Design philosophy and technological capabilities of bottom hole assembly. MIAB. Mining Inf. Anal. Bull. 2020;(12):114-124. [In Russ]. DOI: 10.25018/0236-1493-2020-12-0-114-124.

T.N. Mendebaev¹, Dr. Sci. (Eng.), Аcademician of Kazakhstan Academy of Natural Sciences, Аcademician of Russian Academy of Natural Sciences, Chief Researcher, e-mail:nvcalmas@mail.ru,
H.Kh. Ismailov², President,
B.K. Izakov², Chief Engineer,
N.Zh. Smashov¹, Cand. Sci. (Eng.), Director,
¹ LLP Scientific Innovation Center Almas, 050009, Almaty, Kazakhstan,
² LLP Tsentrgeolsemka, 100019, Karaganda, Kazakhstan.

T.N. Mendebaev, e-mail: nvc_almas@mail.ru.

1. Epshteyn E. F., Matseychik V. I. Raschet buril'nykh trub v geologorazvedochnom burenii [Design of exploratory drilling stems], Moscow, Nedra, 1979, рр. 99—116.

2. Simonyants S. L., Mnatsikinov I. V. Efficient modification trend in turbo-drilling. Nefteservis. 2013, no 2, pp. 48—50. [In Russ].

3. Dvoynikov M. V., Muraev Yu. D. Engineering solutions and process designs to ensure stable operation of screw downhole motor. Journal of Mining Institute. 2016. vol. 218, pp. 198—201. [In Russ].

4. Iudin M. M. Effect of geological conditions on core recovery ratio of drilling. International Research Journal. 2017, no 5-2 (59), pp. 176—178. [In Russ]. DOI: 10.23670/IRJ.2017.59.092.

5. Lu Yiyu, Tang Jiren, Ge Z., Xia Binwei, Liu Y. Hard rock drilling technique with abrasive water jet assistance. International Journal of Rock Mechanics and Mining Sciences. 2013. Vol. 60. Pp. 47—56. DOI: 10.1016/J.IJRMMS.2012.12.021.

6. Zhabin A. B., Pushkarev A. E., Malikov A. A., Polyakov A. V. Destruction of rocks by super-high pressure water jets. Izvestiya Tul’skogo gosudarstvennogo universiteta, Nauki o zemle. 2014, no 2, pp. 74—78. [In Russ].

7. Gorelikov V. G., Lykov Yu. V., Vlasov L. A. Selecting drilling method for troublesome sedimentary rocks. Ecology and development of society. 2019, no 1 (28), рр. 28—30. [In Russ].

8. Gorelikov V. G. Design features of diamond drill bits for jointed rock drilling. Journal of Mining Institute. 2012. Vol. 197, pp. 29—33. [In Russ].

9. Pushmin P., Romanov G. Efficiency increase of hard rock destruction with the use of eccentric pulses. IOP Conference Series Earth and Environmental Science. 2015. Vol. 27. No 1. Article 012052. DOI: 10.1088/1755-1315/27/1/012052.

10. Rodriguez R., Laguna A., Gaselles M. G., Trapuzzano R., Gomez J. M., Oyatomari C. G., Ulloa P., Chamorro D. Durable yet aggressive conical diamond element bit increases ROP by 34% drilling difficult lower chert/conglomerate aection, Ecuador. SPE Latin American and Caribbean Petroleum Engineering Conference, Quito, Ecuador. 2015. November 18—20.

11. Hempton R., Copeland C., Cox G., Faught J., Blackman W., Prewitt E., McDonough C., White A. Innovative conical diamond element bits drill back-to-back tight curves in one run, improving economics while reducing risk in Avalon shale play, New Mexic. SPE Liguids-Rich Basins Conference-North America, Midland, Texas. 2015. September 2—3.

12. Radhakrishan V., Chuttani A., Anggrani F., Nan H., Poy S. O., Conical diamond element technology delivers step change in directional drilling performanse. IADS/SPE Asia Pacific Drilling Technology Conference, Singapore. 2016. August 22—24.

13. Mendebaev T., Smashov N., Ismailov H., Izakov B., Development of a resours — saving, small — sized downhole hydraulic macnine for well drilling. Eastern-European Journal of Enterprise Technologies. 2019. Vol. 6. No 1(102). Pр. 70—76. DOI: 10.15587/17294061.2019.184939.

14. Mendebaev T. N., Smashov N. Zh. Twin-chamber downhole hydraulic drilling unit. MIAB. Mining Inf. Anal. Bull. 2016, no 6, рр. 66—74. [In Russ].

15. Mendebaev T. N., Smashov N. Zh., Kuatova M. Zh. Water jet destruction of rocks in wee drilling by diamond tools with in dependent flushing ports. Eurasian Mining, 2019. No 2. Pр. 41—43. DOI: 10.17580/em.2019.02.09.

16. Orlov P. I. Osnovy konstruirovaniya. Spravochno-metodicheskoe posobie. T. 2 [Design principles. Reference manual. Vol. 2], Moscow, Mashinostroenie, 1988, pp. 355—361.