UDC 622.24.253
ALUMINIUM
DRILL PIPE RATIONAL USAGE ANALYSIS
Vyrsta
Yaroslav
Poltava Petroleum and Gas College
Poltava National Technical Yuri Kondratyuk University
Justification
and development of practical recommendations to improve the operational
reliability of aluminum alloys in the oil and gas industry based on the study
of the influence conditions of drill pipes on the structure and properties of
aluminum alloys is described in the paper. Methodical base of research is
complex analysis and synthesis of the literature and positive experience of
operating drill pipe during drilling using expert analysis and evaluation of
the obtained data. The result of research is the rationale usage of aluminum
drill pipes in oil and gas industry that improves reliability and reduce drill
string of failures during drilling. The character of corrosion damage during
operation aluminum drill pipe in the borehole corrosive environment. It is
proved that aluminum alloys are not prone to stress corrosion cracking, but
subjected to contact corrosion in contact with steel lock. The possibility to use aluminum alloys for the
production of drill pipes for drilling oil and gas fields is studied. Practical
recommendations for increasing the resource drill pipes during the operation
are given. Nowadays the fuel and energy security is crucial. Due to the limited
resources of oil and gas deposits have to develop at great depths, use directional
drilling angle. Modern drilling technology is designed to increase capacity of
equipment or alternative materials. Resources increase capacity drives are
limited and economically impractical. The use of alternative materials is the
most cost-effective through a large variety of materials. The difficulty in
this case is a reasonable choice of material. The options are aluminum alloys
known from the last century. During recent years, the experience of
high-strength aluminum alloys for the production of deformed drill pipe showed
their significant benefits over by steel. Among the main should be noted the
low proportion and higher specific strength. This factor is particularly
important in the current situation where a growing need to develop new fields in
deep and complex geological conditions. Currently, the use of aluminum alloys
is limited due to the remnants of conservatism in the oil and gas industry and
the lack of practical recommendations for technology and manufacturing
conditions of drill pipes of aluminum alloys. Analysis of studies and
publications devoted to the subject of work. Alloy drill pipe should be used in
the construction of oil and gas wells to a depth of 4000 to 7000 m. It is also
used in drilling ultra-deep wells Kola SG-3 plant Uralmash-15000. By 1990,
various sizes were used in 26 countries. This is due to the advantages of it:
- High precision manufacturing pipes;
- Increased depth of the well;
- Reduced the number of failures in drilling column;
- No destruction pipes from corrosion fatigue;
- Simplified wiring wells;
- Reduced energy consumption process drilling;
- Reduced transportation costs during transportation;
- Reduced the cost of drilling.
Despite the apparent significant advantages, Ukrainian
Enterprises mostly use steel pipes. Drill pipe in the process withstand heavy
loads. The main problem in drilling workability is insufficient drill pipe and
connecting nodes, which leads to a prolongation of the production process and
causes a significant amount of time to replace the pipes that have failed as a
result failures. In this regard, employers need to increase the capacity of the
column of pipes and increase productivity during drilling. Thus, the problem of
improving the reliability of boring columns is topical in today's workplace.
Consider the drill string that is intermediate between the surface drilling
equipment and chisel, located at the mouth. Conventional
drill pipes are made of steel or aluminum alloy circular cross-section,
connected by boring locks. The ends of the drill pipe thickens increase their
strength. Weighted drill pipes make up the bottom of the column and have a
greater wall thickness. Adapters are the kind of connections the drill string.
Adapters rods used for driving connection with swivel drill pipe and drill
pipe. Intermediate Adapters are used to connect other elements of the drill
string. By design, materials and dimensions Adapters have much in common with
boring locks and locking thread they are the same. Improving the quality of
Dodger drill pipe in the castle of providing a large economic impact. Pipes,
mostly in the castle of results in potential loss of drill pipe and equipment
deep, cause losses of millions of hryvnia. In rotary drilling widely used
high-strength drill pipe. Analyze operational character damaged drill pipe and
requirements for materials used to make them. The main factor in operating
inclined and horizontal drilling is the effect of friction on the resistance
movement. Directions address emerging difficulties at the method of drilling:
decrease point increase in load or weight loss installing pipes, the use of
high strength materials, creating a thin tube or the use of materials with high
specific strength, such as aluminum drill pipe. It is in these areas are of
Statoil, BP, Total, Shell, Maersk, Chevron. To increase the drilling parameters
such as capacity, power pumps and top drive is BP Liberty in Alaska. The
company BP is working on the introduction of aluminum tubes for extra-long
drill holes.
When considering the technology of horizontal drilling
one of the most important things is the time and the resistance causes normal
forces. Normal force formed by: the weight of the pipe, which lies on the
bottom wall of the hole; pressing force changes in areas of curvature
associated with tension columns; clamp (pressure) pipes to the wall of the hole
caused by stiffness and clearance. To reduce the magnitude of the moment and
the friction forces to save electricity it is advisable to use materials with
low weight, therefore lower density. Reducing the density of the material
contributes to drill pipes in drilling fluids, reducing requirements for rig
capacity, reduces equipment wearing out and transport costs. Construction of
wells with extra-long departure is almost mastered a highly efficient mining
technology. Construction technology require complex problem solving and
construction of drilling horizontal shaft open large extent: - the torque and
power of resistance while drilling - cleaning the barrel - the elimination of
freeze - down the shank and configurations for the end of the barrel. The use
alloy drill pipes of high reliability in the drill column and alloy casing and alloy tubing is a promising solution to
the problems of building and reduce
costs as operating and capital. Thus, prospective drilling methods are based on
completely different technologies drilling. New solutions can increase the
return on wells while reducing the size and moment of friction during drilling.
These innovations require finding and using alternative materials with high
specific strength or increase power equipment. Undoubtedly, the most promising
and feasible is the selection, testing and use of alternative materials for the
manufacture of drill pipe.
References
1. Fine G.M. and others. The oil pipe of light alloys.
Nedra, 1990.
2. Basovich V.S. Gelfgat M.J., Fine G.M.Status and
prospects of manufacturing of aluminum alloys in the oil and gas industry //
Drilling and Oil. 2003. ¹4.
3. Saroyan A.D. Design of the drill string. Moscow,
"Nedra», 1971. 181c.
4.
http://www.metallcomplex.ru/catalog.aluminevye_burilnie_trubi.html