查看更多>>摘要：Owing to the soaring urge to meet the demand for oil and gas on different frontiers,its exploration all over the world is of paramount importance.Exploration and production of oil calls for handling a huge volume of associated water,produced along with it,referred to as Oilfield Produced Water(OFPW).OFPW is considered a potential threat to the environment due to the presence of toxic constituents such as dissolved and dispersed oil compounds,dissolved formation minerals,production chemical com-pounds,production solids(formation,corrosion,scale,bacteria,waxes,and asphaltenes),dissolved gases.This review is intended to provide information on OFPW,its constituents,impact,and treatment tech-nologies of OFPW from various oilfields across the world.It presents a meticulous analysis of the scope of reusing OFPW instead of freshwater for various processes such as well drilling and completion,re-injection to the reservoir for pressure maintenance,and water flooding process for secondary recovery of crude oil.The reuse of OFPW can reduce the demand for fresh water and turn the wastewater into useable water resources after proper treatment.The paper provides rigorous information on the importance of developing an eco-friendly treatment process for the proper reuse and management of OFPW.
查看更多>>摘要：The article is dedicated to the analysis and modeling of the operation modes of low-flow wells with extended horizontal wellbore(HW)and multi-stage hydraulic fracturing(MHF)during artificial lift with an electric submersible pump(ESP).A comprehensive analysis of the operation modes of Bazhenov formation wells with HW and MHF,working with ESP,has been conducted.Complications in the operation of ESP in such wells,related to proppant carryover,constant productivity decline,and gas factor growth,are shown,and operational data of various types of ESP in wells with complex con-struction are provided.One of the main parts of the manuscript is the new methodology for creating a model of multiphase transient flow in a well with ESP operating in periodic short-term activation(PSA)mode using specialized software.Various approaches for numerical modeling of transient multiphase flows in a well with ESP and a bottomhole separator were used to accurately describe the physical processes.Difficulties that may arise during well operation were demonstrated through the analysis of field data and numerical modeling results.The work includes modeling of complications in HW due to proppant carryover from MHF fractures,resulting in flow blockage in the well.The article demonstrates the process of tuning transient operation modes of a well with ESP in PSA mode using specialized software based on real field data(multiphase flowmeter,pressure gauges,etc.),taking into account the well construction,ESP characteristics,additional equipment(valves,separator,etc.),and reservoir pa-rameters.The model was tuned to actual data,and possible ways of optimizing the operation mode were shown.In addition,the work provides an analysis of the sensitivity of fluid properties and well pa-rameters to non-stationary flow in the well.
查看更多>>摘要：The application of laser in the drilling and perforation of oil wells can achieve great benefits such as reduced drilling costs and time with a higher rate of penetration(ROP)and elimination of casing ne-cessity in oil and gas well drilling.This paper presents an original experimental investigation of Laser cutting through Hashma sandstone(a common quarry rock in Egypt)to develop a good understanding of the laser cutting process in sandstone.Five blocks of Hashma sandstone with dimensions of 35 cm x 35 cm x 10 cm were utilized to study the effects of the various parameters involved in the lasing(cutting)process in order to evaluate the cutting process through sandstone,investigate the effect of laser parameters on the process and the cutting mechanisms.The experimental results showed that the laser drilling can provide lower specific energy(SE)compared to conventional drilling methods,revealed the effect of various laser and rock parameters(such as beam power,intensity,duration,sample size,and orientation)on the cutting process,and demonstrated the laser cutting mechanisms through sandstone such as thermal spallation and melting mechanisms.Several parameters must be optimized for an op-timum laser cutting process with the lowest SE,such as using the optimum beam power,beam duration(or Lasig time),and beam mode(continuous or pulsed).The optimum parameters may change from one case to another and depend on the overall interactions among the various variables such as thermal dissipation rate and purging system efficiency.
查看更多>>摘要：A new approach to dynamic modeling based on a discrete-imitation concept has been developed.The fundamentals,including terms and principles of the concept,have been explained.The presented concept has been applied to the integrated modeling of the development of a volatile oil reservoir operated by a sucker-rod pumping well within a pump-well-reservoir system.The discrete-imitation model of the"pump-well-reservoir"system,developed based on the principles of the new concept,takes into account fluid flow between the annulus and the lifting bore.It was employed to investigate the operation of the sucker-rod pumping well.The correlation between pumping rate,pump fillage,and stroke speed has been investigated.It was observed that,as the stroke speed increases,both pump performance and pump fillage increase up to a certain point.Beyond this threshold,the pumping rate stabilizes,and the pump fillage experiences a sharp decline.Notably,the maximum pump fillage does not always align with the peak pumping rate.In such instances,achieving an optimal regime is possible only through intermittent pumping.An expression has been derived to determine the optimal pump idle time in intermittent mode.
NETL
NSTL
万方数据