scholarly journals Pore Pressure Prediction using Well-Logging Data in the West Baram Delta, Offshore Sarawak Basin, Malaysia

2019 ◽  
Vol 8 (4) ◽  
pp. 9172-9178
Keyword(s):  
Pore Pressure ◽  
Transit Time ◽  
Oil Recovery ◽  
Oil And Gas ◽  
Gamma Ray ◽  
Reservoir Modeling ◽  
Gas Field ◽  
Overburden Pressure ◽  
Trend Line ◽  
Pore Pressure Prediction

Well-predicted pore pressure is vital throughout the lifetime of an oil and gas field starting from exploration to the production stage. Here, we studied a mature field where enhanced oil recovery is of high interest and pore pressure data is crucial. Moreover, the top of the overpressure zone in west Baram Delta starts at different depths. Hence, valid pore pressure prediction prior to drilling is a prerequisite for reducing drilling risks, increasing efficient reservoir modeling and optimizing costs. Petrophysical logs such as gamma-ray, density logs, and sonic transit time were used for pore pressure prediction in the studied field. Density logs were used to predict the overburden pressure, whereas sonic transit time, and gamma-ray logs were utilized to develop observed shale compaction trend line (OSCTL) and to establish a normal compaction trend line (NCTL). Pore pressure was predicted from a locally observed shale compaction trend line of 6 wells using Eaton’s and Miller's methods. The predicted pore pressure using Eaton’s DT method with Eaton’s exponent 3 showed a better matching with the measured pressure acquired from the repeat formation test (RFT). Hence, Eaton’s DT method with Eaton exponent 3 could be applied to predict pore pressure for drilling sites in the study area and vicinity fields with similar geological settings.

Dynamic effective pressure coefficient calibration

Geophysics ◽  
2015 ◽  
Vol 80 (1) ◽  
pp. D65-D73 ◽  
Author(s):  
Hua Yu
Keyword(s):  
Pore Pressure ◽  
Effective Stress ◽  
Oil And Gas ◽  
Pressure Coefficient ◽  
Oil And Gas Industry ◽  
Velocity Variation ◽  
Effective Pressure ◽  
Overburden Pressure ◽  
Gas Industry ◽  
Pore Pressure Prediction

Pore pressure prediction provides an important risk assessment in the oil and gas industry. Most predrill pore-pressure prediction methods from seismic and/or well-log sonic velocities are based on the effective stress principle, which relates velocity variation to the combined effect of overburden stress and pore pressure. In the current practice of pore pressure prediction, the effective stress coefficient [Formula: see text] is often assumed as unity, which is not always the case, especially when sediments are deeply buried and consolidated. To understand the variation of [Formula: see text] with depth, I analyzed density and velocity trends from more than 100 Gulf of Mexico wells near the Louisiana continental shelf edge. In the study area, overpressure zones are present in most wells and compaction disequilibrium is the dominant overpressure mechanism. Normal compaction trends for velocity and density were built. The overburden pressure model was refined by taking into account that the density gradient approaches zero at the onset depth of overpressure. Based on the effective pressure principle, values for [Formula: see text] in the overpressure intervals were estimated in the study area. The average [Formula: see text] values varied from 0.6 to 0.9 inclusive of errors associated with assuming the gradient of mud weight and pore pressure is the same.

scholarly journals Beyond Carbon Steel: Detecting Wellbore Shape and Cavities, and Cement Imperfections in Cased Wells

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4211
Author(s):  
Timofey Eltsov ◽  
Tadeusz W. Patzek
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Oil Recovery ◽  
Magnetic Permeability ◽  
Carbon Capture ◽  
Oil And Gas ◽  
Carbon Capture And Storage ◽  
Vertical Component ◽  
Co2 Injection ◽  
Gas Field

The non-corrosive, electrically resistive fiberglass casing materials may improve the economics of oil and gas field projects. At moderate temperatures (<120 °C), fiberglass casing is superior to carbon steel casing in applications that involve wet CO2 injection and/or production, such as carbon capture and storage, and CO2-based enhanced oil recovery (EOR) methods. Without a perfect protective cement shell, carbon steel casing in contact with a concentrated formation brine corrodes and the fiberglass casing is superior again. Fiberglass casing enables electromagnetic logging for exploration and reservoir monitoring, but it requires the development of new logging methods. Here we present a technique for the detection of integrity of magnetic cement behind resistive fiberglass casing. We demonstrate that an optimized induction logging tool can detect small changes in the magnetic permeability of cement through a non-conductive casing in a vertical (or horizontal) well. We determine both the integrity and solidification state of the cement-filled annulus behind the casing. Changes in magnetic permeability influence mostly the real part of the vertical component of the magnetic field. The signal amplitude is more sensitive to a change in the magnetic properties of the cement, rather than the signal phase. Our simulations showed that optimum separation between the transmitter and receiver coils ranged from 0.25 to 0.6 m, and the most suitable magnetic field frequencies varied from 0.1 to 10 kHz. A high-frequency induction probe operating at 200 MHz can measure the degree of solidification of cement. The proposed method can detect borehole cracks filled with cement, incomplete lift of cement, casing eccentricity, and other borehole inhomogeneities.

scholarly journals Identification of Geo – Hazard Using Pore Pressure Analysis in ‘MAC’ Field, Niger Delta

2021 ◽  
Keyword(s):  
Pore Pressure ◽  
Gamma Ray ◽  
Pressure Data ◽  
Abnormal Pressure ◽  
Pore Pressure Prediction ◽  
Wireline Logs ◽  
Formation Pore Pressure ◽  
Resistivity Log ◽  
Gamma Ray Log ◽  
Pressure Analysis

Identification of geo-hazard zones using pore pressure analysis in ‘MAC’ field was carried out in this research. Suite of wireline logs from four wells and RFT pressure data from two wells were utilized. Lithologic identification was done using gamma ray log. Resistivity log was used to delineate hydrocarbon and non-hydrocarbon formations. Well log correlation helps to see the lateral continuity of the sands. Pore pressure prediction was done using integrated approaches. The general lithology identified is alternation of sand and shale units. The stratigraphy is typical of Agbada Formation. Three reservoirs delineated were laterally correlated. Crossplot of Vp against density (Rho) colour coded with depth revealed that disequilibrium compaction is the main overpressure generating mechanism in the field. Prediction of overpressure by normal compaction trend was generated and plot of interval transit time against depth show that there is normal compaction from 250m to about 1700 m on MAC-01, but at a depth of about 1800m, there was abnormal pressure build up that shows the onset of overpressure. A relatively normal compaction was observed on MAC-02 until a depth of about 2100m where overpressure was suspected. The prediction of formation pore pressure using Eaton’s and Bower’s method to determine the better of the two methods to adopt for pore pressure prediction shows that the pore pressure prediction using Eaton’s method gave a better result similar to the acquired pressure in the field. Hence Eaton’s method appears to be better suited for formation pore pressure estimation in ‘MAC’ field. The validation of the pore pressure analysis results with available acquired pressure data affirmed the confidence in the interpreted results for this study.

scholarly journals Improvement of oil and gas field development technology

2021 ◽  
Vol 1 (79) ◽  
pp. 76-80
Author(s):  
B. M. Nuranbayeva ◽  
◽  
E. S. Oryngozhin ◽  
D. R. Alaguzov ◽  
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Gas Field ◽  
Field Development ◽  
Oil Reserves ◽  
Original Volume ◽  
Stage Of Development ◽  
Development Technology ◽  
Oil And Gas Field ◽  
Last Stage

During the period of depletion of the main oil reserves in fields entering the last stage of development due to the priority development of highly productive highly permeable reservoirs, an increasing proportion of residual reserves become difficult to recover.Therefore, it becomes relevant to use effective methods of increasing oil recovery in existing fields, most of the original volume of geological reserves remains in the deposits. One of these methods is unsteady waterflooding, which has proven its effectiveness in a number of fields.

Geological and Field Feasibility Study of Field Development Management Using Marker-Based Production Profiling Surveillance in Horizontal Wells: The Case Study of the Yuzhno-Vyintoiskoye Field

2021 ◽  
Author(s):  
Marat Rafailevich Dulkarnaev ◽  
Yuri Alexeyevich Kotenev ◽  
Shamil Khanifovich Sultanov ◽  
Alexander Viacheslavovich Chibisov ◽  
Daria Yurievna Chudinova ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Water Saturation ◽  
Clay Content ◽  
Horizontal Wells ◽  
Integrated Approach ◽  
Geological Structure ◽  
Gas Field ◽  
Field Development ◽  
Reservoir Rocks

In pursuit of efficient oil and gas field development, including hard-to-recover reserves, the key objective is to develop and provide the rationale for oil recovery improvement recommendations. This paper presents the results of the use of the workflow process for optimized field development at two field clusters of the Yuzhno-Vyintoiskoye field using geological and reservoir modelling and dynamic marker-based flow production surveillance in producing horizontal wells. The target reservoir of the Yuzhno-Vyntoiskoye deposit is represented by a series of wedge-shaped Neocomian sandstones. Sand bodies typically have a complex geological structure, lateral continuity and a complex distribution of reservoir rocks. Reservoir beds are characterised by low thickness and permeability. The pay zone of the section is a highly heterogeneous formation, which is manifested through vertical variability of the lithological type of reservoir rocks, lithological substitutions, and the high clay content of reservoirs. The target reservoir of the Yuzhno-Vyintoiskoye field is marked by an extensive water-oil zone with highly variable water saturation. According to paleogeographic data, the reservoir was formed in shallow marine settings. Sand deposits are represented by regressive cyclites that are typical for the progressing coastal shallow water (Dulkarnaev et al., 2020). Currently, the reservoir is in production increase cycle. That is why an integrated approach is used in this work to provide a further rationale and creation of the starting points of the reservoir pressure maintenance system impact at new drilling fields to improve oil recovery and secure sustainable oil production and the reserve development rate under high uncertainty.

Sandstone Stress Sensitivity Experiment and Stress Sensitivity Evaluation

2014 ◽  
Vol 962-965 ◽  
pp. 526-530
Author(s):  
Tao Gao ◽  
Xiao Guo ◽  
Hong Mei Yang ◽  
Hai Tao Li ◽  
Zheng Zhu
Keyword(s):  
Pore Pressure ◽  
Effective Stress ◽  
Oil And Gas ◽  
Confining Pressure ◽  
Stress Sensitivity ◽  
Differential Method ◽  
Gas Field ◽  
Sensitivity Experiment ◽  
Stress Coefficient ◽  
Pressure Experiment

Change confining pressure experiment or pore pressure experiment is one of the commonly used method to evaluate the reservoir core stress sensitivity. However, a large number of studies have shown that core net stress is not equal to the effective stress,the drawdown pore pressure experiment are consistent with the characteristics of oil and gas field real development process. The pressure stability of drawdown pore pressure experiment is bad, so, a reliable modified method of change confining pressure stress sensitivity experiment is eagerly expected. On the basis of the differential method principle, effective stress coefficient can be determined through core experiments,and with the use of effective stress coefficient , change confining pressure experiment is modified. Main conclusions are as follows:For sandstone core,at reservoir original stress condition with the pore pressure from 15MPa to 11MPa effective stress coefficient from 0.436 to 0.415;Based on Terzaghi effective stress exaggerate stress sensitivity, ontology effective stress can weaken the stress sensitive; Based on effective stress coefficient in this paper correction stress sensitivity is medium weak,impacts on production results almost coincident with the drawdown pore pressure test results.

scholarly journals A Study on the Morphology of a Dispersed Particle Gel Used as a Profile Control Agent for Improved Oil Recovery

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Qing You ◽  
Yongchun Tang ◽  
Caili Dai ◽  
Mingwei Zhao ◽  
Fulin Zhao
Keyword(s):  
Oil Recovery ◽  
Mass Concentration ◽  
Oil And Gas ◽  
Dlvo Theory ◽  
Control Agent ◽  
Gas Field ◽  
Improved Oil Recovery ◽  
Shearing Rate ◽  
Initial Polymer ◽  
Profile Control

To achieve in-depth profile control of injection water and improve oil recovery, a new profile control agent, termed as dispersed particle gel (DPG), has been developed and reported. In this paper, the morphology of DPG and the factors that influence its morphology are systematically investigated using atomic force microscopy (AFM). The AFM studies show that DPG is composed of small pseudospherical particles and that their sizes can be controlled by adjusting the shearing rate, the initial polymer mass concentration, and the salinity. Dynamic light scattering (DLS) is used to study the effects of the initial polymer mass concentration, the shearing rate, the salinity, and the high-temperature aging on the particle size of DPG. The aggregation ability of DPG is explained using the DLVO theory and space stability theory. This work provides a scientific basis and technical support for the formula design of DPG and its application in the oil and gas field.

Nanotechnology for the oil and gas industry – an overview of recent progress

2018 ◽  
Vol 7 (4) ◽  
pp. 341-353 ◽  
Author(s):  
Zhang Zhe ◽  
An Yuxiu
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Imaging Techniques ◽  
Scientific Progress ◽  
Oil And Gas Industry ◽  
Superior Performance ◽  
Comprehensive Overview ◽  
Gas Field ◽  
Gas Industry ◽  
Technical Requirements

Abstract Nanotechnology has brought about revolutionary innovations in many aspects of the oil and gas industry. Nanotechnology generates nanomaterials, which are natural or synthetic materials with at least one dimension at the nanoscale (1–100 nm). Among them, nanoparticles (NPs), in particular, have large surface areas and high volume concentrations. Given these dimensional effects, nanomaterials acquire unique mechanical, chemical, thermal, and magnetic properties and, therefore, have a superior performance than conventional micro and macro materials in a range of oil and gas field applications. Nanomaterials can also be custom functionalized by chemical modifications to meet specific technical requirements. In this review, the developments in the recent years concerning the research on nanotechnology in drilling, completion, reservoir protection, enhance-oil-recovery (EOR), sensing and imaging techniques, stimulation techniques in oil and gas migration and accumulation have been summarized. The aim of this paper was to provide a comprehensive overview of the scientific progress of nanotechnology in the oil and gas research areas, identifying the existing barriers and challenges, and evaluating the technical and economic prospects in this field.

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