Novel Approach for Selecting Well Candidates and Appropriate Design of Hydraulic Fracturing in Challenging Reservoirs

2021 ◽  
Author(s):  
Muhammad Mirza ◽  
Hassan Al Saadi ◽  
Ricardo Sebastian Trejo ◽  
Rifat Kayumov ◽  
Ahmed Hilal
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Selection Process ◽  
Lessons Learned ◽  
Candidate Selection ◽  
Significant Heterogeneity ◽  
Water Contact ◽  
Well Completion ◽  
Medium Permeability ◽  
Selection Of

Abstract Karim and Haradh reservoirs within the Karim Small Fields (KSF) cluster in the South of the Sultanate of Oman are characterized by low to medium permeability and significant heterogeneity and contain medium to heavy crude oil. Reservoir depths are in the range of 1500 to 2000 m and productive areas are relatively small (around 2 km2 per field). Over the past 10 years, fields development did not result in sustained oil production despite the close well spacing. Geological and reservoir studies indicated that this is mainly due to the heterogeneity, lack of reservoir continuity and presence of significant wellbore damage in most wells. Accordingly, the KSF operator initiated an appraisal campaign focusing on hydraulic fracturing to stimulate the producing wells and improve the extension of their drainage areas. This campaign resulted in significant improvement in well productivity and the analysis of results indicates good potential for improving the ultimate oil recovery from these reservoirs. Although the results from hydraulic fracturing campaign are encouraging, they also indicate that appropriate selection of well candidates, key parameters in the fracturing procedure, effects of well completion and impact of well age are very important for successful oil gain. As a result, a comprehensive procedure for selecting and ranking candidate wells for hydraulic fracturing in Karim and Haradh formations has been developed. The procedure includes assessing the impacts of key properties such as fracture height, depth of oil-water contact, thickness of oil column, and distance to faults. In addition, the lessons learned from the previous appraisal campaign will contribute to achieving optimum fracture geometry in future campaigns. The candidate selection workflow involves understanding the geology, geomechanics, and petrophysics of the wells in which a fracturing operation was performed previously in different formations in KSF. More than 20 existing wells were screened through the candidate selection process using a clear workflow to incorporate all the relevant aspects of the selection criteria. The outcome of the candidate selection phase led to selection of the best wells for fracturing operations in the Karim and Haradh formations. The improvements on the fracturing design have been followed to obtain the optimum fracturing design for the selected wells.

The Use of Tracer Technologies for Well Monitoring with Multi-Stage Hydraulic Fracturing on Bolshetirskoye Oil Field

2021 ◽  
Author(s):  
Ivan Krasnov ◽  
Oleg Butorin ◽  
Igor Sabanchin ◽  
Vasiliy Kim ◽  
Sergey Zimin ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Hydraulic Fracture ◽  
Horizontal Wells ◽  
Pilot Project ◽  
Oil Field ◽  
Well Completion ◽  
Construction Design ◽  
Multi Stage ◽  
Urgent Task

Abstract With the development of drilling and well completion technologies, multi-staged hydraulic fracturing (MSF) in horizontal wells has established itself as one of the most effective methods for stimulating production in fields with low permeability properties. In Eastern Siberia, this technology is at the pilot project stage. For example, at the Bolshetirskoye field, these works are being carried out to enhance the productivity of horizontal wells by increasing the connectivity of productive layers in a low- and medium- permeable porous-cavernous reservoir. However, different challenges like high permeability heterogeneity and the presence of H2S corrosive gases setting a bar higher for the requirement of the well construction design and well monitoring to achieve the maximum oil recovery factor. At the same time, well and reservoir surveillance of different parameters, which may impact on the efficiency of multi-stage hydraulic fracturing and oil contribution from each hydraulic fracture, remains a challenging and urgent task today. This article discusses the experience of using tracer technology for well monitoring with multi-stage hydraulic fracturing to obtain information on the productivity of each hydraulic fracture separately.

scholarly journals Reservoir Model and Production Strategy of Mishrif Reservoir-Nasryia Oil Field Southern Iraq

2020 ◽  
Vol 10 (3) ◽  
pp. 54-85
Author(s):  
Hamzah Amer Abdulameer ◽  
Dr. Sameera Hamd-Allah
Keyword(s):  
Oil Recovery ◽  
Carbonate Rock ◽  
History Matching ◽  
Water Saturation ◽  
Oil Field ◽  
Neutron Density ◽  
Reservoir Model ◽  
Water Contact ◽  
Medium Permeability ◽  
Production Strategy

Nasryia oil field is located about 38 Km to the north-west of Nasryia city. The field was discovered in 1975 after doing seismic by Iraqi national oil company. Mishrif formation is a carbonate rock (Limestone and Dolomite) and its thickness reach to 170m. The main reservoir is the lower Mishrif (MB) layer which has medium permeability (3.5-100) md and good porosity (10-25) %. Form well logging interpretation, it has been confirmed the rock type of Mishrif formation as carbonate rock. A ten meter shale layer is separating the MA from MB layer. Environmental corrections had been applied on well logs to use the corrected one in the analysis. The combination of Neutron-Density porosity has been chosen for interpretation as it is close to core porosity. Archie equation had been used to calculate water saturation using corrected porosity from shale effect and Archie parameters which are determined using Picket plot. Using core analysis with log data lead to establish equations to estimate permeability and porosity for non-cored wells. Water saturation form Archie was used to determine the oil-water contact which is very important in oil in place calculation. PVT software was used to choose the best fit PVT correlation that describes reservoir PVT properties which will be used in reservoir and well modeling. Numerical software was used to generate reservoir model using all geological and petrophysical properties. Using production data to do history matching and determine the aquifer affect as weak water drive. Reservoir model calculate 6.9 MMMSTB of oil as initial oil in place, this value is very close to that measured by Chevron study on same reservoir which was 7.1 MMMSTB. [1] Field production strategy had been applied to predict the reservoir behavior and production rate for 34 years. The development strategy used water injection to support reservoir pressure and to improve oil recovery. The result shows that the reservoir has the ability to produce oil at apparently stable rate equal to 85 Kbbl/d, also the recovery factor is about 14%.

scholarly journals Combining Clientelism and Incumbency Advantage: Political Strategy in Candidate Selection for the 2017 Local Head Election in Bekasi Regency

2019 ◽  
Vol 4 (1) ◽  
pp. 21-42
Author(s):  
Caroline Paskarina ◽  
Rina Hermawati ◽  
Desi Yunita
Keyword(s):  
Political Parties ◽  
Selection Process ◽  
Political Support ◽  
Candidate Selection ◽  
Political Strategy ◽  
Incumbency Advantage ◽  
Party Elites ◽  
Selection For ◽  
Depth Interviews ◽  
Selection Of

This article discusses the post-clientelist initiatives used by political parties in the selection of candidates within the party to determine the regent and vice regents nominated for the local election. Candidate selection is the political domain of political parties, but in the context of figure-based politics, parties tend to play more as political vehicle in the candidacy of local head. Through this role, resource exchanges take place between parties and candidates within the internal party candidacy arena. Using qualitative methods through in-depth interviews and observations of candidate selection in the Bekasi Regent 2017 election, this article seeks to reveal how post-clientelist initiatives are used by party elites to optimize the incumbency advantage as main political resource in the candidate selection to determine who will pair the incumbent. The results show that the dominance of party elites in candidate selection process determines how financial resources and political support are optimized to win the incumbent. Decision to choose the vice-regent from the same party while still forming coalitions with other parties indicates that post-clientelistic strategy is operated both internally and externally. This practice confirms the tendency of the candidate selection model to be more inclusive because it involves other parties, but remains pragmatic.

Experience of Using Continuous Production Surveillance Techniques in Multilateral Wells on Yuzhno-Priobskoye Field

2021 ◽  
Author(s):  
Nadir Husein ◽  
Vishwajit Upadhye ◽  
Igor Leonidovich Novikov ◽  
Albina Viktorovna Drobot ◽  
Viacheslav Valeryevich Bolshakov ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Recovery Rate ◽  
Capital Expenditure ◽  
Continuous Production ◽  
Improved Oil Recovery ◽  
Well Completion ◽  
Multi Stage ◽  
Side Track ◽  
Horizontal Side

Abstract This paper deals with the case of using the production surveillance inflow tracer based method in one of multi-lateral wells located in the Yuzhno-Priobskoye field. Tracer systems were placed in the well during the well construction by horizontal side tracking, and multi-stage hydraulic fracturing (MSHF) was performed, with the parent borehole remaining in operation. This technology allows developing the reservoir drainage area with a lateral hole and bringing the oil reserves remaining in the parent borehole into production, which results in an increased well productivity and improved oil recovery rate. Tracer systems are placed into the parent borehole within a downhole sub installed into the well completion. Polymer-coated proppant packs were injected during multi-stage hydraulic fracturing to deliver the tracers to the side track lateral. Dynamic production profiling was done to aid into more efficient development of complex and heterogeneous reservoirs and improve of the productive reservoir sweep ratio during the construction of multilateral wells, which enabled us to address several key problems: Providing tools for waterflood diagnostics in multilateral wells and finding an easy water shutoff method for a certain interval Assessing the efficiency of multi-stage hydraulic fracturing and elaborating the optimal treatment design Selecting the optimal mode of the multilateral well operation to prevent premature flooding in one or more laterals Evaluating whether well construction was performed efficiently, and a higher production was achieved by side tracking. Currently, the proposed first-of-its-kind solution enables the operator to obtain a set of data that can help not only significantly improve the wells’ productivity and increase the oil recovery rate, but also lead to a considerable economic savings in capital expenditure.

Accurate Selection of Police Officials within Small Municipalities: “Et Tu Assessment Center?”

1987 ◽  
Vol 16 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Kirk O'Hara ◽  
Kevin G. Love
Keyword(s):  
Selection Process ◽  
Assessment Center ◽  
Candidate Selection ◽  
Community Residents ◽  
One Year ◽  
Community Input ◽  
Selection Of ◽  
Municipal Official

Two unique issues raised in using an assessment center to select a municipal official were successfully addressed. Community input, involvement and acceptance of an innovative selection process (i.e., the assessment center method) was gained through the use of interviews, a mail-out survey and by training selected community residents to serve as assessors. Expenditure for the selection process was minimized by using unpaid professionals as assessors and by utilizing city offices as the setting for the assessment center. A mail-out survey approximately one year later indicated the community residents perceived the project and candidate selection as successful.

Hydraulic Fracturing Design Optimization Guidelines for Heterogeneous Reservoir

2022 ◽  
Author(s):  
Hussein Al Samli ◽  
Ahmed Al Shueili ◽  
Ricardo Sebastian Trejo ◽  
Rifat Kayumov ◽  
Musallam Jaboob
Keyword(s):  
Hydraulic Fracturing ◽  
Fracture Propagation ◽  
Lessons Learned ◽  
Single Stage ◽  
Single Treatment ◽  
Propagation Process ◽  
Wide Range ◽  
Future Fracture ◽  
Productive Zone ◽  
Selection Of

Abstract This paper describes the journey of hydraulic fracturing design solutions and implementation in Khazzan field. More than 100 wells have been stimulated with hydraulic fracturing in the field in the last decade. Most of these wells were treated with a single-stage massive propped hydraulic fracturing treatment aimed at stimulating the entire vertical productive zone in a single treatment. More recently, hydraulic fracturing has begun on the southern acreage from Khazzan, referred to as Ghazeer. Producing layers in this area are thicker and higher permeability and, as a result, more prolific. Based on the available data and experiences, the establishment of clear guidelines has become a requirement to help the understanding and adjust the hydraulic fracturing design for each well to be become a well-specific optimum design. During the stimulation journey, surveillance techniques have been utilized and implemented in the Khazzan and Ghazeer fields to provide and develop better understanding of the fracture propagation process. These data have proven essential to support stimulation design evolvement and determine if multiple fracturing stages are justified or whether a single stage would be sufficient. Based on a wide range of hydraulic fracture stimulation operations performed across the Khazzan and Ghazeer fields, a flowchart was developed to integrate all the lessons learned from the previous experience and help optimize future fracture design. Clear guidelines include the rationale between the selection of single or multiple fracturing stages, the selection of optimal pad fractions, and other associated details of the fracture design. This flowchart has been extensively validated with surveillance and has proven its inherent value in many stimulated wells, with either single or multiple proppant fracturing stages.

scholarly journals STUDY OF FILTRATION OF FORMATION FLUIDSAFTER HYDRAULIC FRACTURING

2017 ◽  
pp. 50-54
Author(s):  
S. Y. Abass
Keyword(s):  
Hydraulic Fracturing ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Injection Wells ◽  
Selection Of

The technology of conducting hydraulic fracturing in extracting and injection wells and the techniques of selection of wells for hydraulic fracturing in operational fund of wells of Priobskoye field had been reviewed. Based on the conducted analysis of technologies of enhanced oil recovery the necessity of conducting hydraulic fracturing in low-productivity reservoirs was proved.

Labour and Racism: Trade Unions and the Selection of Parliamentary Candidates

1994 ◽  
Vol 42 (2) ◽  
pp. 165-201 ◽  
Author(s):  
Les Back ◽  
John Solomos
Keyword(s):  
Political Parties ◽  
Political Institutions ◽  
Trade Unions ◽  
Selection Process ◽  
Candidate Selection ◽  
British Society ◽  
Black Candidates ◽  
Recent Developments ◽  
Selection Of

The issue of the representation of minorities in political institutions has become central in recent debates about the political sociology of race in British society. This paper uses a case study of a selection process for a prospective parliamentary candidate for the Labour Party to explore the dynamics of recent developments. It explores the following questions: What impact have minority activists had on processes of candidate selection? How have political parties responded to demands for the selection of more black candidates?

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