Research Paper
Petroleum Engineering – Drilling
Abdeslem Leksir
Abstract
Column final test facing new challenge, in addition to casing burst/collapse limitations; buckling occurrence creates serious problems. Practically, in case of slight gap between mud and slurry densities, buckling initiation is inevitable. Casing elongation, bending and buckling detailed, to define column ...
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Column final test facing new challenge, in addition to casing burst/collapse limitations; buckling occurrence creates serious problems. Practically, in case of slight gap between mud and slurry densities, buckling initiation is inevitable. Casing elongation, bending and buckling detailed, to define column behavior while testing. Buckling influences on slurry pointed out too, and compared to column without test. New cement quality indicator is proposed, tested and validated via logging of wells drilled in different regions. Results generalized to cover other situations rather than heavy sections. Gas migration region, depleted reservoir, weak zones are all examined. Registrations confirm the appearance of buckling either while pumping slurry or pressure testing. New modified casing selection method conjointly with updated numerical technique proposed to prevent buckling. Experimental and simulation findings confirm the reliability of the proposed technique.
Research Paper
Petroleum Engineering – Reservoir
Seyed Reza Shadizadeh; Amin Derakhshan
Abstract
Oil recovery from oil wet carbonate rock is a big challenge in oil industry. In the present study, the influence of natural surfactant Hawthorn leaves extract (HLE) on oil recovery from carbonate rock is investigated. Two chemical surfactants include Sodium dodecyl sulfate (SDS) and Dodecyl tri methyl ...
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Oil recovery from oil wet carbonate rock is a big challenge in oil industry. In the present study, the influence of natural surfactant Hawthorn leaves extract (HLE) on oil recovery from carbonate rock is investigated. Two chemical surfactants include Sodium dodecyl sulfate (SDS) and Dodecyl tri methyl ammonium bromide (DTAB) were used for validation and comparison oil recovery with new natural surfactant HLE. Wettability alteration test using contact angle method, interfacial test (IFT) using pendant drop and core flooding were employed to investigate the behavior of the surfactants on oil recovery. Experimental results show the Critical Micellar Consentration (CMC) point of different concentrations of HLE, SDS and DTAB solution occurred at 3.25, 3 and 4.06 wt. %, respectively. The natural surfactant HLE was more effective than other chemical surfactant (SDS and DTAB) at CMC point in wettability alteration. As observed the contact angle of carbonate pellet and the HLE at CMC point was 86 degrees and this angle for SDS and DTAB were 112 and 92 degrees, respectively. Core flooding results show that oil recovery factor was improved from 37% with water flooding to 47.6 with SDS; 56.2% with DTAB and 54.7% with HLE. The results prove that; this new natural surfactant (HLE) can be used as a novel surfactant for chemical enhanced oil recovery process in carbonate oil reservoirs. HLE has beneficial effects in oil recovery because of its environment friendly compare to SDS and DTAB.
Research Paper
Petroleum Engineering – Exploration
Bahram Alizadeh; Zollfaghar Eivazi Nezhad; Majid Alipour
Abstract
In this study, the hydrocarbon potential and depositional environments of the Coniacian Laffan Formation were investigated in the Binak Oilfield, SW Iran. With an average thickness of 80 meters, the Laffan Formation consists mainly of gray shales and thin argillaceous limestones in the study area. In ...
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In this study, the hydrocarbon potential and depositional environments of the Coniacian Laffan Formation were investigated in the Binak Oilfield, SW Iran. With an average thickness of 80 meters, the Laffan Formation consists mainly of gray shales and thin argillaceous limestones in the study area. In order to investigate the hydrocarbon potential, 22 cutting samples from 5 wells of the Binak Oilfield were analyzed by both Rock-Eval 6 pyrolysis and organic petrographic techniques. The HI versus Tmax diagrams indicated a mixed type II/III kerogen with maturity corresponding to early stages of the oil window (Tmax ≈ 435 ˚C). In addition, plots of S1+ S2 versus TOC were consistent with a weak to excellent hydrocarbon potential for the Laffan Formation. Organic petrographic techniques, on the other hand, indicated that the main organic constituents of the Laffan Formation are inertinite and bituminite with subordinate amounts of amorphous organic matter (AOM). In other words, the contained organic matter was mainly composed of inertinite and lacked significant hydrocarbon potential. Abundance of inertinite along with conspicuous absence of vitrinite macerals in the studied samples suggested that the Laffan Formation was deposited under sub-oxic marine conditions. Furthermore, the presence of bituminite in the studied samples greatly influenced the Rock-Eval pyrolysis readings. Thus, geochemical evaluation of the Laffan Formation using only Rock-Eval pyrolysis data may lead to erroneous interpretations. Therefore, combination of Rock-Eval and organic petrographic methods is deemed necessary for reliable geochemical evaluation of the Laffan Formation. The results of this study can be useful for better understanding of the Cretaceous hydrocarbon system in the study area.
Research Paper
Petroleum Engineering – Drilling
Mohamad Esmaiel Naderi; Maryam Khavarpour; Reza Fazaeli; Arezoo Ghadi
Abstract
A successful drilling operation requires an effective drilling fluid system. The aim of this work is to provide an effective solution for improving the rheological and filtration properties of water-based drilling fluid by using CuO nanofluid additive. CuO nanoparticles were synthesized by hydrothermal ...
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A successful drilling operation requires an effective drilling fluid system. The aim of this work is to provide an effective solution for improving the rheological and filtration properties of water-based drilling fluid by using CuO nanofluid additive. CuO nanoparticles were synthesized by hydrothermal method using autoclave, which can control the temperature as well as pressure. Then CuO nanofluid (eco-friendly ethylene glycol based) were produced to use as a drilling fluid additive. X-ray diffraction, Fourier-transformed infrared, scanning electron microscope were used to characterize nanoparticles. The results confirmed clearly the formation of high purity CuO nanoparticles forming a wire shape structure. The operating parameters were optimized by experimental design method and based on the optimal results, two long time stabilized nanofluids were prepared to improve the rheological properties and the fluid loss of a polymeric water-based drilling fluid. Xanthan, polyanionic cellulose and starch are commonly used in drilling fluids to improve rheological and fluid loss properties. Also, the effect of pH level of nanofluids on the improvement of water-based drilling fluid properties was investigated. The results showed that the nanofluid with pH=8 can be used as the best additive to improve the drilling fluid properties. The improvement of the yield point, apparent viscosity, 10-second and 10-minute gel strengths of the drilling fluid as well as the fluid loss were 45, 33, 200, 100 and 44 %, respectively.
Research Paper
Petroleum Engineering
Bardiya Yazdani; Amir Hossein Saeedi Dehaghani
Abstract
This research purpose is to investigate the effect of microwaves on the physical and chemical properties of heavy crude oil, in the presence of different minerals. In this regard, the physical and chemical changes of the oil and rock powder (sand and carbonate) mixture have been investigated by microwave ...
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This research purpose is to investigate the effect of microwaves on the physical and chemical properties of heavy crude oil, in the presence of different minerals. In this regard, the physical and chemical changes of the oil and rock powder (sand and carbonate) mixture have been investigated by microwave radiation. Viscosity and temperature changes of two samples have been measured. IP143 and elemental analysis (Carbon, Hydrogen, Nitrogen, and Sulfur) were used to extract and identify the composition changes of asphaltene, respectively. Based on the viscosity and temperature changes, it was found that for both samples at the beginning of microwave radiation there was a decrease in viscosity as a result of heavy hydrocarbon particles cracking, such as asphaltene, and converting them into lighter ones. By continuing the radiation and temperature increase, light compounds started to evaporate; finally, the increase in viscosity was observed. The evaporation process in the sample containing carbonate powder started earlier than the sand powder. From elemental analysis, it was concluded that the sulfur and nitrogen in asphaltene have decreased almost the same for both samples, and this decrease is more evident for sulfur, so the rock powder combined with oil did not have a significant effect on the reduction of these elements. The increase in IFT was also observed due to the evaporation of light oil compounds, and due to the higher temperature of the sample containing carbonate rock powder, more IFT increases have been observed.
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