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ALUMINIUM DRILL PIPE RATIONAL USAGE SOME ASPECTS

Vyrsta Yaroslav

Poltava Petroleum and Gas College

Poltava National Technical Yuri Kondratyuk University

Nowadays the fuel and energy security of Ukraine is extremely important. Due to the limited resources of oil and gas deposits have to develop at great depths, and use horizontal directional drilling. Modern drilling technology designed to increase capacity of equipment or alternative materials. Resources increase capacity drives are limited and economically impractical. Economically rational use of alloy materials is extremely important. The difficulty in this case is a reasonable choice of material. The options are aluminum alloys known from the last century. In recent years, foreign experience of high-deformed aluminum alloy drill pipe for making them displayed significant advantages over steel, including the major proportion is smaller and higher specific strength. This factor is particularly important in the current situation when growing need to develop new deposits at great depths and in difficult geological conditions. Currently, the use of aluminum alloys is limited in the oil and gas industry in Ukraine. Despite the significant advantages: strengthening external surface drill pipes, high purity surface precision manufacturing for the geometrical parameters, including straightness, that provides high-speed, non-vibration drilling practices, the smooth movement of the inner channel of drill pipe, threaded pipe joints high strength and impermeability - drilling Company Ukraine mostly used steel pipes. The quantity of horizontal wells increases in domestic and foreign drilling practice every year. Since 2015 OJSC "NK" Rosneft "in the Consortium project" Sakhalin-1 "successfully completed drilling the world's longest horizontal well 0-14 [1], drilled towards the far southeastern part of the deposit" with drilling platform "Orlan". The well has a length of 13,500 meters on the trunk and the horizontal section of the barrel - 12033 m. Analysis of domestic and foreign technology, allows us to conclude that a rational layout of the drill string and drill pipes performance are critical factors that affect the efficiency of drilling wells. Alloy drill pipe is used in drilling oil and gas wells to a depth of 4000 to 7000 m, including horizontal wells long. Drilling was carried out with the use of 70-80% of the volume of sinking oil wells. Drill pipe in the process withstand heavy loads, but the main problem in the drilling process is the lack of reliability of the drill pipe and connecting nodes, which leads to increase in the duration of the production process and, consequently, entails considerable amount of time to replace the pipes that are out of order as a result of failures. In this regard, there is a need to increase the reliability of the column of pipes and improve productivity during drilling. Thus, the problem of improving the reliability of drill column is relevant in today's workplace. The usefulness of aluminum drill pipes in oil and gas industry, thereby increasing the reliability of the drill string and reduce failures during drilling, summarizing the advantages of the use of drill pipe from aluminum with external screw spiral ribs and aluminum drill pipe in combined columns in drilling horizontal hole large extent is studied in the paper. The main limitations while drilling the lower ranges of horizontal wells have a problem cleaning the barrel of sludge and the difficulties in communicating axial load and torque to the bit in the process of overcoming the resistance, which, in turn, oppose the movement and rotation of the drill string. The most dangerous consequence of compressive stress is a local loss longitudinal stability, which is first in the form of a plane sine wave that moves with increasing loading space to form a spiral. The main limitations while drilling the lower ranges of horizontal wells have a problem cleaning the barrel of sludge and the difficulties in communicating axial load and torque to the bit in the process of overcoming the resistance, which, in turn, oppose the movement and rotation of the drill string. When drilling with rotation is also evident in the forms of vibrational plane sinusoidal or space spiral snake that planetary axis hole by the action of the combination of loads: compressive longitudinal and transverse centrifugal.

Excess compressive efforts on critical loads accompanied by significant efforts in pressing contact is borehole wall that could lead to "hang" and jamming column. When drilling horizontal wells to combat compressed parts according to recommendations by the following methods:

- more rigid configurations, including the thick-walled pipe with a larger outer diameter spiral ribs outer surface and fitted protectors in the center of the pipe;

- weight loss to horizontal section;

- reduce resistance when moving through improved cleaning and layout inclusion of special devices such as "Hydrowedge";

- limitation regimes drilling without rotation.

All these recommendations are aimed, on the one hand, to increase the longitudinal stiffness, on the other - to reduce resistance when moving. However, recommendations are mutually contradictory requirements include: increasing the rigidity of steel drill pipe is always associated with an increase in their weight and as a result - with increasing resistance movement and rotation. In addition, the use of high speed causes increased wearing out locks and body tubes on the horizontal section of the trunk, and also reduces the durability of drill pipe.

Given the specific physical and mechanical properties of aluminum alloys, allows during drilling appropriate to replace steel alloy drill pipe in particular drill pipe from aluminum with external screw spiral fins. The details include: a small proportion in drilling fluids, specific strength, the flexibility that facilitates placement of the pipes in highly curved areas of the trunk.

Analysis of foreign technologies and technical means used for horizontal wells allows concluding that a rational layout of the drill string and the performance of the drill pipes are crucial factors affecting the efficiency of drilling of wells. The use combined with the inclusion of alloy drill pipe allows while drilling not only significantly reduce the load on the lift of the rig, but also increase the length of the horizontal stem of these well. During drilling is under compressive effort, while during the vertical and directional wells with small zenith angles bulk is stretched. The most dangerous consequence of compressive stress is a local loss of longitudinal stability.

REFERENCES

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2. Basovich V.S. Prospects of alloy drill pipe with an outer spiral fins for drilling horizontal wells and sidetracks / V.S. Basovich, I.N. Buyanovsky, V.V.Sapunzhi // "Drilling and oil» - 2014. - № 5-p. 42-46.

3. Wu J. and Juvkam-Wold H.C. Coiled Tubing Implication in Drilling and Completing Horizontal Wells // SPE Drilling & Completion. 1995, March. P. 16 - 21.

4. Fine G.M. Oil pipe made of light alloys / G.M.Fayn, V.F. Shtamburg, S.M. Danelyants. - Nedra, 1990. - 222 p.