Wyniki wyszukiwania - BazTech

1

Treatment of methanol-containing wastewater at gas condensate production

Ivanov Andrey, Strizhenok Alexey, Borowski Gabriel

Journal of Water and Land Development

|

2022

|

no. 54

84--93

EN

The purpose of the study was to assess the impact of industrial wastewater on the concentration of methanol in the considered section of the Ob River basin, present proposals for the implementation of a new treatment system and analyse the implementation results. On the basis of the results of the analysis of the known methods for reducing the concentration of methanol in water, a new technological scheme for post-treatment of effluents using biological treatment with methylotrophic Methylomonas methanica Dg bacteria was proposed. The calculation of the dilution of treated wastewater using the “NDS Ecolog” program was carried out on the basis of the detailed calculation method of Karaushev, the results of which showed a decrease in the concentration of methanol in the control section to 0.0954 mg∙dm-3 (permissible concentration is 0.1 mg∙dm-3). During the period of the flood of the Glukhaya channel, it ceases to be a separate water body and, in fact, becomes part of the flood channel of the Ob River. Certain parts of the flooded areas, due to elevation changes, communicate with the channel only during a short period of time when the water level rises, i.e. 3-5 weeks during the flood period, and in fact remain isolated reservoirs for the rest of the time, potentially acting as zones of accumulation and concentration of pollutants.

2

Separation of natural gas liquids and water from gas condensate

Takerhi Matthew Efe

Journal of Geotechnology and Energy

|

2021

|

Vol. 38, no. 1

11--25

EN

Unlike dry gas reservoirs, condensate gas reservoirs contain a considerable amount of natural gas liquids which should be extracted to maximize energy usage. This paper uses Bryan ProMax to set up the processing units for the recovery of natural gas liquids and removal of water. The parameters for the simulation were a gas composition which assumes a sweet gas content. The outcome of the simulation includes reduction of water content below 7 lbm/MMscf, recovery of methane and recovery of propane and isobutane only. The glycol dehydration unit minimized water impurity, while cooling with Joule-Thomson valve and heat exchangers help in methane recovery and separation from natural gas liquids. The results show that natural gas liquid recovery which depends on gas composition can be recovered by controlling the conditions of several units, namely heat exchangers, flash vessels, cold separators, fractionators, stabilizers with their reboilers and condensers.

3

Gas-condensate banking and well deliverability : a comparative study using analytical- and numerical models

Ursin J. R.

AGH Drilling, Oil, Gas

|

2016

|

Vol. 33, no. 2

259--289

EN

Reservoir condensate blockage in the reservoir and in particular in the close vicinity of the wellbore may result in significant loss of well deliverability for medium to tight gas reservoirs. The dynamics of fluid flow in these types of reservoirs are investigated by way of analytical description and by numerical simulation of radial two phase flow behavior. The analytical model is based on a single phase semi steady-state solution, being revised for two phase flow of gas and condensate oil. As the liquid is dropping out of the gas, a saturation distribution of immovable oil is seen to develop radially in the reservoir with time. Condensed oil not being part of this saturation distribution is produced to the surface. The numerical model is a cylindrical, single well, fine gridded, simulation model run on the Eclipse E300 compositional simulator. The base case study comprises a rich gas condensate fluid (GOR ~ 1000 Sm3/Sm3), an initial gas-in-place volume of 750 MSm3, and reservoir permeability of 10 mD. A gas flow rate of 0.5 MSm3/day is leading to a production period of about 4 years. A comparative study is performed by varying parameters such as pressure development, development of bank of immovable oil both radially and as function of time, condensate blockage effects, and gas and condensate oil production and onset of reduced well deliverability. Sensitivity analysis are performed by studying variation in the productivity index, non-Darcy and mechanical skin, and sensitivities related to permeability. It has been confirmed in this study that condensate blockage has a direct and negative impact on well deliverability, where both the plateau period and the bottom hole pressure are reduced. We also show that the analytical model compares well with the numerical models and that many features describing gas-condensate banking and well deliverability are adequately described in the model. The analytical model also offers insight into the process of reservoir liquid storage in gas condensate reservoirs.

4

Confined phase envelope of gas-condensate systems in shale rocks

Nagy S., Siemek J.

Archives of Mining Sciences

|

2014

|

Vol. 59, no. 4

1005--1022

EN

Natural gas from shales (NGS) and from tight rocks are one of the most important fossil energy resource in this and next decade. Significant increase in gas consumption, in all world regions, will be marked in the energy sector. The exploration of unconventional natural gas & oil reservoirs has been discussed recently in many conferences. This paper describes the complex phenomena related to the impact of adsorption and capillary condensation of gas-condensate systems in nanopores. New two phase saturation model and new algorithm for search capillary condensation area is discussed. The algorithm is based on the Modified Tangent Plane Criterion for Capillary Condensation (MTPCCC) is presented. The examples of shift of phase envelopes are presented for selected composition of gas-condensate systems.

PL

Gaz ziemny z łupków (NGS) oraz z ze złóż niskoprzepuszczalnych (typu ‘tight’) staje się jednym z najważniejszych zasobów paliw kopalnych, w tym i następnym dziesięcioleciu. Znaczący wzrost zużycia gazu we wszystkich regionach świata zaznacza się głównie w sektorze energetycznym. Rozpoznawanie niekonwencjonalnych złóż gazu ziemnego i ropy naftowej w ostatnim czasie jest omawiane w wielu konferencjach. Niniejszy artykuł opisuje złożone zjawiska związane z wpływem adsorpcji i kapilarnej kondensacji w nanoporach w złożach gazowo-kondensatowych. Pokazano nowy dwufazowy model równowagowy dwufazowy i nowy algorytm wyznaczania krzywej nasycenia w obszarze kondensacji kapilarnej. Algorytm bazuje na kryterium zmodyfikowanym płaszczyzny stycznej dla kapilarnej kondensacji (MTPCCC). Przykłady zmiany krzywych nasycenia są przedstawiane w wybranym składzie systemów gazowo- kondensatowych.

5

Sensitivity analysis of thermodynamic parameters in gas-condensate systems for reserve estimation by means of probabilistic modeling

Nagy S., Siemek J.

Archives of Mining Sciences

|

2009

|

Vol. 54, no 4

709-723

EN

An improper sampling (non-representative) of reservoir fluid may introduce significant errors in reserve estimation. The process of verification and correction of PVT properties has been described, as well as, estimation of uncertainty of evaluation reserves based upon real geologic information. An analysis of vertical change of gas-condensate system composition in the thick geologic structures has been done. Compositional gradients influence saturation pressure (dew or bubble) and other fluid properties. This paper describes the complex phenomena related to mixing and segregation processes occurring during secondary migration and post-filling time of oil and gas-condensate system. The paper discusses the classical and non-equilibrium phenomena in the porous medium in presence of thermal gradient. The verification of PVT properties is based upon the reverse simulation processes using Tsai-Chen version of Peng-Robinson Equation of State. The regression procedure for correction of uncertain parameters in which density of stabilized condensate is the most important convergence criterion - has been applied. The sensitivity of other parameters (e.g. pay thickness, area, porosity, initial saturation of fluids) is included in the general procedure of global uncertainty reserves estimation. The analysis of typical parameter distribution has been made, based on a literature review. The Latin Hypercube Sampling has been used to final probabilistic simulation. Several examples of reserve estimations and their uncertainty have been done. The large impact of improper PVT on the condensate phase reserve estimation has been observed.

PL

Niewłaściwa procedura poboru próbki płynu złożowego dla układu gazo-kondensatowego i układu lekkiej ropy naftowej może powodować duże błędy w ocenie zasobów złoża. Pokazano proces weryfikacji obliczeń zasobów i sposoby korekty własności PVT, jak również niepewność szacowania zasobów złoża na podstawie niepełnych rzeczywistych danych. Wykonana została analiza wpływu zmian własności PVT w pionie na wielkość zasobów. Pokazano wpływ gradientów kompozycyjnych na położenie kontaktu gaz-kondensat (ciśnienie nasycenia). Artykuł opisuje również problemy związane z mieszaniem się i segregacją węglowodorów podczas wtórnej migracji i napełnianiu pułapki złożowej. Opisane są klasyczne i nie-równowagowe zjawiska w ośrodku porowatym w obecności gradientu geotermicznego. Weryfikacja własności PVT jest wykonywana na podstawie odwrotnej symulacji procesu równowagi wg równania Penga-Robinsona (wersja Tsai-Chen). Procedura regresji celem korekcji niedokładnych parametrów z wykorzystaniem gęstości stabilizowanego kondensatu została wykorzystana w obliczeniach. Wrażliwości równania opisującego zasoby w odniesieniu do innych parametrów (np. miąższości efektywnej, powierzchni złoża, porowatości, początkowego nasycenia fazą węglowodorową). Została wykonana analiza rozkładu badanego parametru I oszacowany został jego wpływ na wielkość szacowanych zasobów. Metoda próbkowania Latin Hypercube została wykorzystana do modelowania probabilistycznego. Pokazano przykłady szacowani a zasobów oraz niepewności takich oszacowań. Zaobserwowano znaczny wpływ niereprezentatywnej próbki płynu złożowego na wyniki obliczeń zasobów kondensatu w złożu.

6

Osobennosti proektirovania razrabotki gazokondensatnyh mestorozdenij na zaversauscej stadii promyslennoj ekspluatacii

Pavlov S. D., Galko T. N.

Prace Instytutu Nafty i Gazu

|

2008

|

nr 150 wydanie konferencyjne

981--988

EN

The stocks of gas in new deposits of hydrocarbons (which putted into exploration during of last years) are mostly small. Therefore the basic extraction of gas is linked to the baseline fields, such as Shebelinske, West Hrestishchenske, Efremivske, Mashivske, Rospashnivske, and fields with 10-50 billion m3 of initial balance stocks. The most common features of a reservoir engineering at a completing stage of extraction are reduction of operating pressures, a low production rate of wells and unsatisfactory availability index of wells. The basic technological decisions that allow to stabilize gas-producing rates and to enhance gas and condensate efficiency of production facilities, are: reduction of operating pressures on a number of fields for the purpose of accretion of gas recovery rates, changing of depleted production facilities to the upper or bottom ones, boring of new exploitation wells and restoration of liquidated ones, engineering of the side-tracking trunks in a low-rating holes and in the holes of the idle fund.