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Nuraini Nuraini
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
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DETERMINATION OF PG12S SURFACTANT PHASE BEHAVIOUR IN THE MIXTURE OF OIL - SURFACTANT - COSURFACTANT - WATER Tjuwati Makmur; Nuraini Nuraini
Scientific Contributions Oil and Gas Vol 31 No 3 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.3.1013

Abstract

Surfactant is surface active agent chemical, while isopropyl alcohol (IPA) and also isobutyl alcohol (IBA) are known as cosurfactant and include types of alcohols used in enhanced oil recovery (surfactant flooding) method. Factors of surfactant, cosurfactant, and NaCl concentrations play important role in determination of phase behavior. Based on the results of phase behavior tests that the mixture of oil – PG12 surfactant – cosurfactant (IPA & IBA) – WIP water showed macroemulsion phase for all analyzed samples at different experimental conditions. PG12 surfactant is unable to be used for enhanced oil recovery by chemical injection, because it is very difficult to flow in porous media and to displace oil, because the occurrence of plugging which is caused by opaque and milky macroemulsion.
MEASUREMENT OF PHYSICAL ROCK PROPERTIES AND SELECTION OF IDENTIFIED CORE PLUGS FOR INJECTIVITY AND BLOCKING TESS Nuraini Nuraini
Scientific Contributions Oil and Gas Vol 28 No 1 (2005)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.28.1.1034

Abstract

An oil field on the island of Sumatra in Indonesia has excess water production problem. Its watercuts are greater than 90 %. Excess water production is not only linked to poor sweep efficiency, but also causes many problems in oil industry, such as scaling, corrosion, cost of oil water treatment and cost of water disposal, and in effective hydrocarbon mobility. Optimizing oil production often requires considerable time, effort and challenge. Chemical injection (e.g. BW Polymer) is a method proposed to solve the current problem in the oil field. Hopefully, the excess water production will be blocked effectively by using chemical injection method in order to obtain maximum productivity and recovery. This paper is especially focused on measurement of physical rock properties, identification and selection of core plugs for injectivity and blocking test study
THE INFLUENCE OF ISOPROPYL ALCOHOL CONCENTRATION ON THE CHANGE OF PHASE BEHAVIOR IN THE MIXTURE OF OIL - SURFACTANT - ISO PROPYL ALCOHOLFORMATION WATER Nuraini Nuraini
Scientific Contributions Oil and Gas Vol 28 No 3 (2005)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.28.3.1042

Abstract

Surfactant is surface active agent chemical that has two types of properties; lyophobic (like water) and hydrophobic (like oil). One of enhanced oil recovery methods that is used to improve oil recovery factor, is surfactant flooding. Oil and water are two separated phases and have high interfacial tension value (around 30-40 dyne/cm). Addition of surfactant solution at certain concentration into the mixture of oil-surfactant-formation water will change the phase behavior. In this case, four types possibilities of emulsion formed, these are: • Upper phase; Middle phase (microemulsion); Lower phase; Macroemulsion. According to Prince, L.M (Theory and Practice of Microemulsions), change of phase behavior in the oil-surfactant-formation water mixture is influenced by several factors, one of them is concentration of alcohol. The main focus of this research is to study influence of isopropyl alcohol (IPA) concentration on phase behavior in the oil-surfactant-IPA-formation water mixture.Concentration Behavior Oil - Surfactant - Iso
DATA PREPARATION FOR WATER INJECTION LABORATORY TEST Tjuwati Makmur; Nuraini Nuraini
Scientific Contributions Oil and Gas Vol 27 No 1 (2004)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.27.1.1046

Abstract

Oil production limit that is usually followed by decrease of oil productivity in old fields is a major problem and can't be avoided. This case happened when cumulative oil production has approached primary recovery method. Decrease of the action of native reservoir energy is followed by drastically increase of production of water (saturation almost 100 %). In relation to this, a method is needed to obtain the additional oil recovery. Water injection method is one of the solutions to solve oil production problem that happened in old fields. It is expected that by using water injection method, productivity and oil recovery in old fields can be improved. Water that is used as the fluid injected into reservoir to improve oil recovery is sea water. How far oil recovery can be improved by using water injection method, is determined by a laboratory research. Before carrying out water injection laboratory test; one has to know what are the main points that play important role in determining the optimal oil recovery by water injection method. These are: firstly, basic parameters, secondly, laboratory test for water flooding, thirdly, the displacement of water injection process, then, standard operational procedure, next, water injection to obtain the additional oil recovey, lastly, the results are plotted a figure and or tabulated as the result of water injection laboratory test is obtained. In relation to the mentioned above, it will be better to write a scientific paper of water injection laboratory test. This paper is written based on our experience in enhanced oil recovery research (EOR), supported by textbook, such ás American Petroleum Institute, Petroleum Production Handbook and Standard Corrosion and water Technology For Petroleum Producers. Therefore, the main focus of this paper is "Data Preparation for Water Injection Laboratory Test". Hopefully, the contents of this paper give precious and useful informations, that is extremely valuable not only for LEMIGAS as Research and Development Centre for Oil and Gas technology, but also for the oil industry of the Departement of Petroleum Engineering of the universities in Indonesia
THE INFLUENCE OF ALCOHOL TYPE AND CONCENTRATION ON THE PHASE BEHAVIOR AND INTERFACIAL TENSION IN OIL-SURFACTANTCOSURFACTANT-BRINE MIXTURE SYSTEM Hadi Purnomo; Nuraini Nuraini; Tjuwati Makmur
Scientific Contributions Oil and Gas Vol 27 No 2 (2004)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.27.2.1059

Abstract

The number of mechanism is limited for reducing the entrapment of oil in the pore space of reservoir rock and for mobilizing that residual which remains entrapped, thereby improving the microscopic displacement efficiency of a petroleum recovery process. After primary recovery by flow powered by the energy stored in the compressed fluids of reservoir, and secondary recovery by injection-pump driven water flooding, residual oil is trapped by the capillary pressure developed by interfacial tension in curved menisci between oil and water in the pore space. Figure 1.1 illustrates the interplay of capillary and viscous forces in the water flooding process. Shown in the figure is water displacing oil. The important point is that residual oil is trapped in the pore space by interfacial tension. To improve micros- copic displacement efficiency is to reduce interfacial tension between oil and water. Surfactant is surface active agent chemical that has two types of properties; lypofob (like water) and hydrofob (like oil). The value of interfacial tension between oil and water is high, when surfactant is dissolved into water and contacts with oil, so that surfactant is not only soluble in the water, but also it is soluble in the oil. By addition of surfactant into the water and contact with oil can result in interfacial tension between oil and water from high (more less 20 - 30 dyne/cm) to lower interfacial tension (10-2 dyne/cm). To change the lower interfacial tension to the lowest interfacial tension conditions (10-4dyne/cm), cosurfactant in oil-surfactant-brine mixture is used. Alcohols are widely used in micellar surfactant systems for enhanced petroleum recovery and are variously called cosurfactant or cosolvent. In general, alcohols modify the physico- chemical properties in ways that are important to the design of surfactant-based process for improving petroleum recovery. This research is focused on alcohol effects on oil-surfactant-brine phase behavior and interfacial tension of oil-surfactant-brine system.
Co-Authors Hadi Purnomo Tjuwati Makmur