DOI: 10.24411/2076-6785-2019-10053
Showing the relationship between the constructive and technological process of hardening threaded conical surface drill pipe (geometry of a strengthening of the movie, the size of the load, radius of hollow), magnitude and distribution of residual stresses in a threaded surface based on complex mathematical models developed and a series of pilot studies stress-strain state threads and fatigue tests.
Showing the relationship between the constructive and technological process of hardening threaded conical surface drill pipe (geometry of a strengthening of the movie, the size of the load, radius of hollow), magnitude and distribution of residual stresses in a threaded surface based on complex mathematical models developed and a series of pilot studies stress-strain state threads and fatigue tests.
The paper presents the results of studies of the mechanical properties of the material of pipes made of 17G1S steel by various manufacturers of tubular products, and an assessment of the influence of these properties on the strength reliability of main pipelines. Results processing of studies for mechanical characteristics of pipe steels and the calculation of the probability of failure-free operation of main pipeline linear sections according to the strength criterion are based on the mathematical apparatus of non-parametric statistics, taking into account the actual distribution laws of the random variables under study.
The article presents the results of full scale tests, in which studied the influence of metal pipe bundles on the pipelines functionality. It is shown, that in case the influence of non-design loads on oil and gas pipelines, as well as when the genesis of metal bundles is caused by the degradation of metal properties, such defects can have a negative impact on the resistance of the pipeline to destruction.
The article is devoted to the definition of control method of Barkhausen hardened drill pipe thread. In this case, the method for hardening of constructional alloy steel is high quality surface plastic deformation deep rolling. It is particularly important that the study done non-destructive method to get data about a toughened surface layer.
Set the relationship between the constructive and technological process parameters folding threaded conical surface drill pipe (geometry of a strengthening of the movie, the size of the load, radius of hollow), magnitude and distribution of residual stresses in a threaded surface based on complex mathematical models developed and a series of pilot studies stress-strain state threads and fatigue tests.
The correlations between constructive and technological process parameters of drill-pipe tapered surface thread burnishing (configuration of hardenable rolling element, load rate, root radius), magnitude of residual stress and stress distribution on the thread surface were interrelated. They are based upon the set of discovered mathematical models and experimental research of stressed-deformed state and fatigue tests.
Determination of flow resistance at unsteady flow condition is still a problem for engineering hydraulic calculations even in a circular pipe. The issue becomes important when considering special practical problems, in particular, hydraulic impact. Such problems include hydraulic fracturing aimed at stimulating oil well productivity. To create calculation programs implementing the mathematical models of this processit is necessary to set the initial conditions not only reflecting the relationship of flow parameters, but also having a convenient representation for further calculations. The article describes a method of the velocity profile construction over the cross section of a circular pipe at steady flow conditions in a form convenient to use in the hydrodynamic calculations. Transformation of the profile differential equation into a discrete analogue for calculations using the non-uniform discretization grid was applied.
In the article were identified the main causes of failure of oilfield and drilling equipment in complicated conditions and executed their analysis. An efficient method of deep roll thread to increase durability of the products was proposed.
Centrifugal-casted pipes of high-temperature steels and alloys are widely used in many branches of engineering. For example, radiant pipes are used in thermal furnaces with protective atmosphere, hearth rolls are used in continuous thermal and heating furnaces of ironworks, rollers are used in continuous annealing units etc. Opportunity of increasing of natural gas high-temperature conversion working parameters on the methanol and ammonia units is very important question, because temperature and pressure increasing not only raise up productivity of units, but also decreasesproduct cost price and allows to get hydrogen with higher purity.
In the article were suggested variants of constructions of coiled tubing pipes based on polymer materials.The basic technical parameters of pipes were calculated.Exploitation’s area for metal-polymercoiled tubes was defined.
With development of industrial branches ofthe Russian Federation requirements to qualityof products raise, therefore, requirementsto quality of the carried-out technologicaloperations connected with creation of thisproduction raise. In this article design featuresof the new camera of the furnace for heatingof the steel pipes, allowing to increase quality(uniformity) of heating of steel pipes, efficiencyof use of a thermal stream (efficiency) andto reduce time of heating of steel pipes areconsidered.
Carried out the numerical simulation of the surface plastic deformationof bottom of thread by deep roll with the use of a packet ABAQUS. Determined the values of residual stresses with the different valuesof roller depression.
The constant development of new and old fields in contexts different from previous ones, requires continuous development of production techno the corrosion resistance. Today on the agenda is developing the production casing with a clean technology, make-up.
The main purpose of this paper isto provide a reliable and durable in operation of the pipeline, which has an inner and an outer polymer coatinginsulation and preservation of pipeline capacity and ease of installation. With the construction of long, fishing and pipelines, where the main type of connection is welding, pipewith an inner polymer coating and outer insulation so far used is limited. This is due to the fact that the mountingpipe during welding in a large coverage area of the weld burns. This is especially true of pipelines, inside of which can not get people (diameter 600 mm).Naked weld metal with prolonged contact with corrosive media is subjected to corrosion, which may be the cause of the accident.
Experience of the Russian enterprises in maintenance and improvement of quality of a superficial layer pumps of API Specification 11 ÀÕ and subs, accuracy of performance of the sizes, and increases in durability hight-load surfaces is shown. Economic benefit and urgency of application of technology of hardening of carving connection are revealed.
There are developed processes of controlling stressed-deformed state of long length barrels in their processing, including heat treatment, transverse bending straightening, hole boring and honing, allowing to achieve the straightness level within 0.1 mm (0,0039 inch) on 1.0 m (3 7/25 ft) length after the completive operation of ionic-vacuum nitriding in pulse plasma without further processing. There are elaborated technological processes of hardening by ionic-vacuum nitriding in pulse plasma for high-loaded threaded surfaces of drill pipe and tubing subs,
increasing their operational life (also due to creating new high-torque threaded connections) by 3 … 5 times.
The effective strength of threaded-tight fiber-glass plastic sleeves used for local surface defects repair is evaluated. The results of experimental tests carried out on a pipe test sample having the artificial defect are shown. Pressure limit for a pipe with longitudinal crack-like defect is calculated.
In article questions protection against vibration pipeline systems on the basis of vibroisolators with elastic elements hyper high dissipation energy from a material «metallrubber», widely applied in mechanical engineering and the space techniques are considered.
In NGDU «Lyantorneft» held industrial cleaning of pump-compressor pipes producing wells with the use of thermochemical reagents. Cleaned pipes in the process of overhaul life and "deaf" idle wells. Quantity of reagent on one treatment from 3 up to 35 kg.