Academic literature on the topic 'Dynamogram'

Abstract Determining the length of the plunger’s pumping is an integral part of the calculation of the well pump. However, it should be borne in mind that the pumping course of the plunger is different for each well. Therefore, the article proposes to define it from the dynamogram, on the coordinate parameter “pumping course” which is length, starting from the point of the minimum load on the TPS before the start of the suction. The opening of the supercharged valve shows a minimum load level, which has reached the lowest value due to the maximum high pressure of liquid compression in the working cylinder, after opening load begins to increase. This is the main sign of the opening of the supercharged valve. Mathematical modeling of the interaction of the column of rods and liquid showed: the column of rods, having a higher mass than the mass of liquid, is not subjected to a large forced oscillation, which is reflected on the dynamogram. The opening moment of the discharge valve indicates the beginning of liquid injection or the effective stroke of the plunger, therefore, we need to find exactly this point on the dynamogram circuit.Towards the end of the turn down the column comes to its original state, freed from longitudinal bends and vibrations. Then it can be argued: on the distance of the plunger’s run his intermediate state cannot have an impact. However, this allegation requires proof.

TARGET. The purpose of this work is to develop a method for diagnostics of equipment of sucker rod pumping units (SRPU) during operation according to the parameters of the wattmetrogram. A wattmetering module is used as a measuring element, the developed software in the MatLab software package serves as a tool for processing vibration signals. The technical condition of the sucker rod pumping unit is analyzed by the parameters of the wattmetrogram and the amplitude spectra of the object under study, formed using the fast Fourier transform procedure in the MatLab software environment.METHODS. The wattmetering method allows you to control the sucker rod-pumping unit during its operation under voltage. This control method is highly accurate, sensitive to developing defects, and allows the use of computer technologies for signal processing and analysis.RESULTS. The wattmetering method is fully disclosed. The construction of the spectrum is considered. The relationship between the wattmetrogram and the dynamogram has been established. The removal and evaluation of experimental data from the operating sucker-rod pumping unit during its operation was carried out. A wattmetrogram and a dynamogram were built, a spectrum was also built, which showed the presence of defects in this installation.CONCLUSION. This method of wattmetering with the MatLab software allows you to monitor the technical condition of the sucker rod pumping unit according to the amplitude-frequency characteristics of the wattmetrogram parameters.

TARGET. The purpose of this work is to develop a method for diagnostics of equipment of sucker rod pumping units (SRPU) during operation according to the parameters of the wattmetrogram. A wattmetering module is used as a measuring element, the developed software in the MatLab software package serves as a tool for processing vibration signals. The technical condition of the sucker rod pumping unit is analyzed by the parameters of the wattmetrogram and the amplitude spectra of the object under study, formed using the fast Fourier transform procedure in the MatLab software environment.METHODS. The wattmetering method allows you to control the sucker rod-pumping unit during its operation under voltage. This control method is highly accurate, sensitive to developing defects, and allows the use of computer technologies for signal processing and analysis.RESULTS. The wattmetering method is fully disclosed. The construction of the spectrum is considered. The relationship between the wattmetrogram and the dynamogram has been established. The removal and evaluation of experimental data from the operating sucker-rod pumping unit during its operation was carried out. A wattmetrogram and a dynamogram were built, a spectrum was also built, which showed the presence of defects in this installation.CONCLUSION. This method of wattmetering with the MatLab software allows you to monitor the technical condition of the sucker rod pumping unit according to the amplitude-frequency characteristics of the wattmetrogram parameters.

Despite of the increased share of oil wells equipped with submersible electrical centrifugal pumps, a considerable part of them is equipped and operated with sucker-rod pumping units. When operating wells with sucker-rod pumping units, different plunger pumps are used. The rod string is operated in severe environment due to long contact with highly corrosive well products and time-variant loads. Taking into account all acting loads, the diagnostics of the condition of sucker-rod pumping units is a difficult task. At the majority of oil fields in Russia, the operation of wells equipped with sucker-rod pumping units is controlled by portable and stationary dynamographs of various models. Moreover, dynamographs are used, as a rule, only to obtain images of dependence of the force on the polished piston rod upon its stroke. Based on dynamograms it is possible to find the well flow rate, pump capacity, force on the polished piston rod, etc. But one of the main problems to be solved with the help of dynamometry is the forecasting of down-hole equipment condition in the process of further operation. In this paper we overview the methods to diagnose the condition of sucker-rod pumping units based on dynamograms. The aim of the work is to develop the mathematical model to forecast the failures of down-hole pumping equipment on the results of dynamometry to automatize the control process of the unit operation. The research tasks are to analyze the existing methods for diagnosing the condition of sucker-rod pumping units, and to develop the mathematical model for forecasting the failure of the valve unit leakage. As a result, the method for forecasting the increased failure on the example of the fluid leakage in the pump injection unit is proposed. The permissible boundaries of the change in the relative force on the polished piston rod are drawn up. As a result, the failure increase is forecasted based on the frequency of the relative force on the polished piston rod getting within the interval obtained.

Abstract The problem of measuring the flow rate of wells with low production rates is relevant for many oil fields. Conventional flow meters are not suitable for such cases, and installing an additional flow meter for each well is impractical. At the same time, wells with sucker-rod pumping units (the majority of wells) are outfitted with dynamographs for continuous diagnostics of the pumping equipment state. Dynamograms allow determining the theoretical flow rate of the well easily, however, a mathematical model is required to estimate the actual flow rate. For the correction of flow rate obtained from dynamograms, the authors of this study propose using models based on regression equations that link the calculated valueswith the measurements made by a reference instrument. The results of the experiments have confirmed the eligibility of this approach.

The studies are dedicated to some changes into the mathematical model and improvement of the algorithm of converting watmetrograms into dynamograms in the horsehead. The paper researches the kinematics of the horsehead. The mathematical model is developed considering the mass of the sucker rod pump.

In the paper we considered a hybrid method of dynamograms wavelet analysis, applied for oil-production equipment work mode identification. Neural network architecture for sucker-rod deep-well pump units malfunctions detection is proposed. The architecture of intellectual data recognition system applied for pump installation control is presented.

Integrate criterion for the evaluation of pathological gait based on the distinction of the pattern dynamograms of vertical components of weight bearing reaction at walking in norm and in injured lower extremities is suggested. In patients with different pathology of lower extremities the application of this criterion in clinical practice allows to perform the integral evaluation of gait using the minimum of informative biomechanical parameters. Suggested criterion could serve as an universal index for the evaluations of treatment and rehabilitaion results and may be used in research and clinical practice.

The development of fields that are at a late or final stage of operation is carried out mainly with the use of downhole sucker rod pumps. The most characteristic failures for these installations are rods parting-twist off and malfunctions of pump valves. The methods of eliminating these accidents vary significantly the parting or twist off of the rods involves lifting of the downhole equipment, and the "sticking" of the shut-off valve assembly of the pump is eliminated by "resuscitation" of the downhole equipment (flushing with water, hot oil or solvent). An error in fault identification leads to incorrect planning of work to restore the operability of the downhole equipment and, as a result, to economic losses.
 The cause of malfunctions of the downhole equipment of downhole rod pumping units, as a rule, is determined by analyzing dynamograms. However, in many cases dynamograms do not allow to distinguish the lower twist off of the rods from the malfunction of the valves of the rod pump. In the presented work, a method for the operational determination of the parting or twist off of rods in the well is considered, which consists in creating an electrical circuit "rod string tubing string" and monitoring its integrity. To determine the type of malfunction, the synchronization unit measures the resistance of the system on the dielectric insert via the electromagnetic channel. In case of parting or twist off of the rods, the electrical resistance of the "tubing-pump-rod string" circuit will be much higher (more than 2 ohms) than in the absence of this failure (0...2 ohms).

На основі інформації по відмовам КНШ в „Надвірнанафтогаз” здійснено статистичний аналіз аварійності елементів КНШ і визначено вплив експлуатаційних факторів на їх довговічність. Підкреслено значний вплив викривленості свердловин на частоту та розподіл відмов. Розроблено методику аналітичного розрахунку напружень і зусилля притискання КНШ до стінок насосно-компресорних труб (НКТ) на скривлених ділянках. За даною методикою проаналізовано закономірності впливу профілю свердловини та параметрів КНШ на зусилля притискання та напруження згину в НШ. Розроблено методику та необхідні засоби для дослідження впливу тертя НШ по НКТ на її корозійно-втомну довговічність. Результати досліджень дозволили зробити висновок про позитивний вплив фрикційної складової на корозійно-втомну довговічність НШ для мало скривлених свердловин (зусилля притискання до 100 Н). Значну увагу приділено розробці удосконаленого засобу вимірювання навантажень, діючих в верхній частині штангової колони, який дозволяє виділяти високочастотні цикли навантажень КНШ і проводити безпосередній запис результатів вимірювань для їх обробки на ПЕОМ. З допомогою розробленого удосконаленого динамографа з індукційним давачем переміщень проведено експериментальні дослідження з оцінки навантаженості КНШ в експлуатаційних умовах та розроблено розрахунково-експериментальний метод раціонального вибору кінематичних характеристик приводу. Удосконалено розрахункові методики оцінки впливу експлуатаційного процесу навантажування на довговічність насосних штанг, а саме, впливу багаточастотності та напружень, нижчих за границю витривалості матеріалу НШ. Розроблено розрахунково-експериментальний метод з оцінки залишкового ресурсу КНШ в конкретних умовах експлуатації.<br>Диссертация посвящена усовершенствованию методов оценки долговечности насосных штанг с учетом существенных эксплуатационных факторов. В первом разделе рассмотрено состояние исследований по тематике диссертационной работы. На основе информации по отказам колонн насосных штанг (КНШ) в „Надворнаянефтегаз” осуществлен статистический анализ аварийности элементов КНШ и определено влияние эксплуатационных факторов на их долговечность. Подчеркнуто значительное влияние искривленности буровых скважин на частоту и распределение отказов. Рассмотрены работы отечественных и зарубежных ученых, касающиеся прогнозирования долговечности колонны в эксплуатационных условиях. На завершение раздела обоснована актуальность темы диссертационной работы, сформулировано задачи исследований. Во втором разделе разработана методика и необходимые средства для исследования влияния трения НШ по НКТ на ее коррозионно-усталостную долговечность. Значительное внимание уделено разработке усовершенствованного средства измерения нагрузок, действующих в верхней части штанговой колонны, которое позволяет выделять высокочастотные циклы нагрузок КНШ и проводить непосредственную запись результатов измерений для их обработки на ЭВМ. В третьем разделе разработана методика аналитического расчета напряжений и усилие прижимания КНШ к стенкам насосно-компрессорных труб (НКТ) на искривленных участках. По данной методике проанализировано закономерности влияния профиля буровой скважины и параметров КНШ на усилие прижимания и напряжение изгиба в НШ. Разработан расчетно-экспериментальный метод оценки остаточного ресурса КНШ в конкретных условиях эксплуатации. Четвертый раздел посвящен экспериментальным исследованиям нагружения, долговечности и остаточного ресурса колонны насосных штанг. Проведена оценка эксплуатационной нагрузки колонны насосных штанг и его влияния на ее долговечность. Проанализированы результаты эксплуатационной нагрузки насосных штанг на работающих буровых скважинах, которые получены с помощью разработанной конструкции динамографа с датчиком малых перемещений. Разработан расчетно-экспериментальный метод определения длины хода и числа качаний насоса для заданного диаметра плунжера. С помощью данного метода возможно стабилизировать динамический уровень жидкости, т.е. согласовать приток жидкости из буровой скважины и подачу глубинного насоса. Также проведено исследования долговечности колонны насосных штанг с учетом эксплуатационного нагружения. Анализ проведенных экспериментальных исследований с помощью усовершенствованной методики прогнозирования остаточного ресурса деталей и оборудования в типичных условиях эксплуатации позволил определить параметры кинетической диаграммы коррозийной усталости насосных штанг. На основе данных параметров рассчитан остаточный ресурс штанг после определенного срока эксплуатации.<br>The statistical analysis of rods string (RS) elements accident rate based on breakdowns data of "Nadvirnanaftogas" is carried out and operational factors effect on rods durability is worked out. Significant influence of wells deviation on breakdowns frequency and distribution is emphasized. The method of analytical calculation of stress and RS press strain to the tubing walls on deviated parts is developed. Principles of well profile and RS parameters influence on press strain and bend strain in rods are analyzed. The method and wherewithal for research of influence of rod and tubing friction on its corrosion-fatigue durability are developed. Research results gave the possibility to conclude about positive influence of frictional constituent on rods corrosion-fatigue durability for weakly deviated wells (press strain less than 100 N). Significant attention is focused on development of improved device of loads measurement that act on the top of rod string. Improved dynamograph with induction displacement transducer allows to single out high-frequency cycles of RS loads and to conduct immediate recording of measurement results for its processing.

Abstract This paper presents a holistic approach to modern oilfield and well surveillance through the inclusion of state-of-the-art edge computing applications in combination with a novel type of data transmission technology and algorithms developed in-house for automatic condition monitoring of SRP systems. The objective is to enable the responsible specialist staff to focus on the most important decisions regarding oilfield management, rather than wasting time with data collection and preparation. An own operated data communication system, based on LPWAN-technology transfers the dyno-cards, generated by an electric load cell, into the in-house developed production assistance software platform. Suitable programmed AI-algorithms enable automatic condition detection of the incoming dyno cards, including conversion and analysis of the corresponding subsurface dynamograms. A smart alarming system informs about occurring failure conditions and specifies whether an incident of rod rupture, pump-off condition, gas lock or paraffin precipitation occurred in the well. A surface mounted measuring device delivers liquid level and bottomhole pressure information automatically into the software. Based on these diverse data, the operations team plans the subsequent activities. The holistic application approach is illustrated using the case study of an SPR-operated well in an Austrian brownfield.