High Frequency Pressure Monitoring of the Re-Fracturing or Continuous Pumping Operations: Case Studies

2022 ◽  
Author(s):  
Juan David Estrada ◽  
Roman Korkin ◽  
Sergey Parkhonyuk
Keyword(s):  
Hydraulic Fracturing ◽  
Oil And Gas ◽  
Successful Outcome ◽  
Minimal Risk ◽  
Key Factors ◽  
Efficient Technology ◽  
Horizontal Section ◽  
Factors Affecting ◽  
Production Increase ◽  
Significant Production

Abstract The opportunity to refracture low-producing horizontal wells, which have been fractured few months before is getting more and more popular in the last few years. It provides the opportunity of restoring production without drilling new wells, which might be economically feasible especially in the oil and gas low price environment. However, the success rate of refracturing operations is usually low, mainly driven by the inability to properly stimulate the entire horizontal section. Consequently, many operators do not widely deploy this efficient technology. In contrast, completing a newly drilled well with plug and perf technology allows to individually treat from forty to sixty or even more individual compartments in the lateral section while refracturing attempts to retreat the entire lateral in the absence of any isolating device while trying to cover the entire lateral. There are at least two key factors affecting this operation. First is diversion technology: without efficient chemical diverters, which allow to temporarily block recently treated intervals and divert the stimulation fluid to different open sections of the well is extremely challenging. These diverters should normally be able to hold pressure differentials up to thousand psi or more. Attempting a treatment without this technology, aka a "blind frac" is not an option in many cases. The second factor is monitoring technology: The ability to recognize whether a zone has been successfully stimulated, to decide on the deployment of diverting technology or the further addition of stimulation fluid, to sponsor lateral coverage with minimal risk of premature screen out becomes of utmost importance for the successful outcome of hydraulic refracturing operations. In the absence of either of the aforementioned factors hydraulic refracturing may become inefficient and yield uneconomic success. This paper presents how the application of novel diverters, combined with proper hydraulic fracturing fluid selection, sound engineering design and more importantly hydraulic fracturing monitoring provide a new opportunity for the deployment of hydraulic refracturing to provide significant production increase and enhance recovery factor.

Investigation of Horizontal Wells with Multi-Stage Hydraulic Fracturing Technological Efficiency in the Development of Low-Permeability Oil Reservoirs

2021 ◽  
Author(s):  
Aleksander Valerievich Miroshnichenko ◽  
Valery Alekseevich Korotovskikh ◽  
Timur Ravilevich Musabirov ◽  
Aleksei Eduardovich Fedorov ◽  
Khakim Khalilovich Suleimanov
Keyword(s):  
Hydraulic Fracturing ◽  
Performance Indicators ◽  
Oil And Gas ◽  
Horizontal Wells ◽  
Productivity Index ◽  
Specific Mass ◽  
Horizontal Section ◽  
Technological Complexity ◽  
Multi Stage ◽  
Effective Development

Abstract The deterioration of the reservoir properties of potential oil and gas bearing areas on mature and green fields, as well as the increase in the volume of hard-to-recover reserves on low-permeable reservoirs set us new challenges in searching and using effective development technologies to maintain and even increase the oil production levels. Based on successful international experience, Russian oil and gas companies use horizontal wells (HW) with multi-stage hydraulic fracturing (MSHF) for the cost-effective development of low-permeable reservoirs. Thus, since the first pilot works of drilling technologies and completion of HW with MSHF in 2011, at the beginning of 2020, over 1,200 HW with MSHF were drilled and came on stream at the fields of LLC RN-Yuganskneftegaz, about half of which are at the exploitation play AS10-12 of the northern license territory (NLT) of the Priobskoye field. In searching the best technologies and engineering solutions, the company tested different lengths of horizontal section of HW, the number of hydraulic fracturing (HF) stages and distances between hydraulic fracturing ports, as well as different specific mass of the proppant per frac port. Recently, there has been a tendency in design solutions to increase the length of the HWs and the number of hydraulic fractures with a decreasing distance between the frac ports and a decreasing specific mass of the proppant per frac port. This work studies the actual and theoretical efficiency of HW with MSHF of various designs (different lengths of horizontal section of HW and the number of HF stages) and to assess the viability of increasing the technological complexity, as well as to analyze the actual impact of loading the proppant mass per port on performing HW with MSHF. The study is based on the results of the analysis of the factual experience accumulated over the entire history of the development of the exploitation play AS10-12 of the NLT of the Priobskoye field of the Rosneft Company. In studying the viability of increasing the technological complexity, especially, increasing the length of horizontal section of HW, increasing the number of HF stages, and reducing the distance between the frac ports: we discovered the typical methodological errors made in analyzing the efficiency of wells of various designs; we developed the methodology for analysis of the actual multiplicity of indicators of wells of various designs, in particular, HW with MSHF relative to deviated wells (DW) with HF; we carried out the statistical analysis of the actual values of the multiplicity of performance indicators and completion parameters of HW with MSHF of various designs relative to the surrounding DW with HF of the exploitation play AS10-12 of the NLT of the Priobskoye field; we performed the theoretical calculation of the multiplicity of the productivity coefficient for the HW with MSHF of various designs relative to DW with HF for the standard development system of the exploitation play AS10-12 of the NLT of the Priobskoye field; we compared the actual and theoretical results. The paper also presents the results of studying the actual effect of changes of proppant's mass per port on performance indicators of HW with MSHF of the same design and with an increase in the number of fractures of the hydraulic fracturing without changing the length of horizontal section of HW. As for performance indicators, being the basis for estimating the efficiency of HW with MSHF of various designs, we used the productivity index per meter of the effective reservoir thickness and the cumulative fluid production per meter of the effective reservoir thickness per a certain period of operation. And as the completion parameters, we used the length of the horizontal section of HW, the number of HF stages, the distance between the frac ports, and the specific mass of the proppant per meter of the effective reservoir thickness per frac port. The results of this work are the determining vector of development for future design decisions in improving the efficiency of HW with MSHF.

scholarly journals ІС-ӘРЕКЕТТІ ЗЕРТТЕУ: МЕКТЕП БІТІРУШІЛЕРДІ ҚОРЫТЫНДЫ АТТЕСТАТТАУҒА ДАЙЫНДАУ ҮРДІСІНДЕ ЕМТИХАН НӘТИЖЕЛЕРІНІҢ ТАБЫСТЫ БОЛУЫНА ӘСЕР ЕТУШІ НЕГІЗГІ ФАКТОРЛАРДЫ АЙҚЫНДАУ

World Science ◽  
2019 ◽  
Vol 2 (6(46)) ◽  
pp. 22-29
Author(s):  
Кариева Г. Ж.
Keyword(s):  
Successful Outcome ◽  
Work Skills ◽  
Key Factors ◽  
Factors Affecting ◽  
Academic Knowledge ◽  
Research Outcome ◽  
The Individual ◽  
Independent Work ◽  
Mathematical Data Processing

When preparing graduates for final certification, special attention should be paid to determining the key factors affecting the exam results in external summative assessment. The purpose of the study is to highlight the main factors, such as the individual quality of students and the level of independent work skills that affect the successful outcome of the exams. Methodology: а questionnaire survey was carried out and a correlation analysis of the results was presented. The mathematical statistics methods in Excel application were used for processing the survey data. Research methods: data collection, statistical mathematical data processing, analysis of the results, and interviewsThe results of the study: In the process of preparing the final certification of graduates, the success of the exam results is closely related to the level of students' independent work skills. and self-education. In turn, the readiness for self-education cannot be carried out without independent work, the attitude to which was determined as a result of the conducted research. Outcome of the study: Successful completion of school exams is closely related to the ability to work independently. Therefore, to increase the academic knowledge of students, it is necessary to focus on the ability of students to work independently in the learning process and to develop effective teaching methods for self-improvement.

High-Pressure Flexible Pipe for Fracturing Fluid Delivery

2021 ◽  
Author(s):  
Enrique Villarroel ◽  
Gocha Chochua ◽  
Alex Garro ◽  
Abinesh Gnanavelu
Keyword(s):  
Hydraulic Fracturing ◽  
Oil And Gas ◽  
Surface Friction ◽  
Oil And Gas Industry ◽  
Fracturing Fluid ◽  
Flexible Pipe ◽  
Horizontal Section ◽  
Gas Industry ◽  
Fluid Delivery ◽  
Equipment Reliability

Abstract Hydraulic fracturing is a well stimulation treatment that has been around since the 1940s, becoming more popular in recent years because of the unconventional hydraulic fracturing boom in North America. Between the 1990s and 2000s, the oil and gas industry found an effective way to extract hydrocarbons from formations that were previously uneconomical to produce. Consolidated unconventional formations such as shale and other tight rocks can now be artificially fractured to induce connectivity among the pores containing hydrocarbons, enabling them to easily flow into the wellbore for recovery at the surface. The method of fracturing unconventional reservoirs requires a large amount of surface equipment, continuously working to stimulate the multiple stages perforated along the horizontal section of the shale formation. The operations normally happen on a single or multi-wells pad with several sets of perforations fractured by using the zipper-fracturing methodology (Sierra & Mayerhofer, 2014). Compared with conventional hydraulic fracturing, the surface equipment must perform for extended pump time periods with only short stops for maintenance and replacement of damaged components. This paper addresses improvements made to the fracturing fluid delivery systems as an alternative to the fracturing iron traditionally used in fracture stimulation services. The improvement aims to enhance equipment reliability and simplify surface setup while reducing surface friction pressure during the hydraulic fracturing treatment.

scholarly journals Surgical uprighting of impacted mandibular second molar: a narrative review

2021 ◽  
Vol 27 (2) ◽  
pp. 28
Author(s):  
Tarnjit Kaur Sangha ◽  
Sukhneet Kaur Sangha ◽  
Brandon Hanna ◽  
Tabassum Tayab ◽  
Soumya Padala
Keyword(s):  
Early Diagnosis ◽  
Treatment Outcomes ◽  
Surgical Management ◽  
Multidisciplinary Approach ◽  
Successful Outcome ◽  
Minimal Risk ◽  
Review Of Literature ◽  
Factors Affecting ◽  
Second Molar ◽  
Mandibular Second Molar

Early diagnosis of impacted mandibular second molar (MM2) is critical since treatment at a later stage can be complicated. It often requires a multidisciplinary approach. Surgical uprighting of impacted MM2 appears to be a safe, effective, and a reliable alternative to conventional orthodontic mechanics with minimal risk of morbidity or pulpo-periodontal problems. Timely diagnosis is critical and factors affecting treatment outcomes must be assessed for a successful outcome. Although surgical uprighting or repositioning is the most commonly prescribed option for MM2 management, there isn't a review of literature that discusses the etiology, assessment, and surgical management of impacted MM2 with an emphasis on surgical uprighting technique and comparing various factors that affect the outcome.

Key Factors Affecting the Investment Attractiveness of an Oil Producing Country

2019 ◽  
pp. 29-58
Author(s):  
Nurlan Nurseiit ◽  
Darmen Sadvakassov
Keyword(s):  
Direct Investment ◽  
Oil And Gas ◽  
Global Market ◽  
Financial Capital ◽  
Key Factors ◽  
Factors Affecting ◽  
Goods And Services ◽  
Business Conditions ◽  
Development Analysis ◽  
Oil And Gas Sector

Foreign direct investment (FDI) is the engine of growth of all countries, contributing to the inflow of financial capital, technology, skills, employment, to the establishment of production of modern goods and services, which enables a national economy to become more competitive in the global market. However, the developing or transition countries often lack the capital to finance their own development. Analysis of 21 developed and developing oil-producing countries from 2008 to 2014 show that the most important factors for attracting investment in the oil and gas sector are the discovery of attractive fields, the creation of a developed and modern infrastructure, increases proven reserves of hydrocarbons, and of corruption. Less important but still factors are a stable currency, an open trade regime, favorable business conditions, as well as lower taxes on oil-producing business.

scholarly journals Causes of delay in construction projects: The case of oil and gas projects

2018 ◽  
Vol 4 (1) ◽  
pp. 11 ◽  
Author(s):  
Aliyeh Kazemi ◽  
Ali Katebi ◽  
Mohammad-Hossein Kazemi
Keyword(s):  
Economic Development ◽  
Construction Projects ◽  
Major Part ◽  
Oil And Gas ◽  
The Other ◽  
Successful Implementation ◽  
Key Factors ◽  
Change Orders ◽  
Factors Affecting ◽  
Causes Of Delays

Successful implementation of construction projects is one of the key factors for economic development of every country. Every year, a major part of the countries’ capital is allocated to civil and infrastructure projects, most of which are implemented with delay. Construction projects are often criticized for overrunning time and budgets. Analyzing the factors causing delay is essential with the aim of omitting them and timely implementation of these projects. Research to identify the reasons and causes of delays have been conducted in different countries and by various researches. In this paper, various research has studied different factors affecting construction projects delays have been studied. These factors have been identified in four groups consisted of owner, consultant, conductor, and other factors. Moreover, on account of the importance of oil and gas projects, the mentioned factors for these kinds of projects are taken into consideration. The results showed that change orders and changes in scope of work by owner, delay in reviewing of documents by consultant, inadequate experience and knowledge and errors during construction by contractor, and low productivity of laborer have been indicated as key factors comparing with the other as crucial factors causing delay in the oil and gas construction projects.

Shale, Quakes, and High Stakes: Regulating Fracking-Induced Seismicity in Oklahoma, USA and Lancashire, UK

2019 ◽  
Vol 3 (1) ◽  
pp. 1-14
Author(s):  
Miriam R. Aczel ◽  
Karen E. Makuch
Keyword(s):  
United States ◽  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Seismic Activity ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
High Volume ◽  
The United States ◽  
Horizontal Drilling ◽  
Induced Seismic Activity

High-volume hydraulic fracturing combined with horizontal drilling has “revolutionized” the United States’ oil and gas industry by allowing extraction of previously inaccessible oil and gas trapped in shale rock [1]. Although the United States has extracted shale gas in different states for several decades, the United Kingdom is in the early stages of developing its domestic shale gas resources, in the hopes of replicating the United States’ commercial success with the technologies [2, 3]. However, the extraction of shale gas using hydraulic fracturing and horizontal drilling poses potential risks to the environment and natural resources, human health, and communities and local livelihoods. Risks include contamination of water resources, air pollution, and induced seismic activity near shale gas operation sites. This paper examines the regulation of potential induced seismic activity in Oklahoma, USA, and Lancashire, UK, and concludes with recommendations for strengthening these protections.

EVALUATION OF FINANCIAL SECURITY OF THE REPUBLIC OF CRIMEA

2020 ◽  
pp. 56-67
Author(s):  
Elena Evgenevna Mashyanova ◽  
Elena Aleksandrovna Smirnova
Keyword(s):  
Financial Markets ◽  
Negative Impact ◽  
Gradual Increase ◽  
Financial System ◽  
Financial Security ◽  
Key Factors ◽  
Factors Affecting ◽  
External Threats ◽  
The Republic ◽  
Global Financial System

In modern conditions of development, financial security is an integral part of the overall security of the region and is formed on the basis of the functioning of the financial system. The complication of relationships between key segments of international financial markets, as well as the limited ability to accurately predict future trends in the development of the global financial system, lead to a gradual increase in the risks that accompany the activities of economic entities, and an increase in the number and scale of internal and external threats that have a negative impact on the financial security of the state. This formulation of the issue requires generalization of approaches to determining the financial security of the region in order to further formalize this issue and determine the key factors affecting it. The article considers the types of financial security, as well as certain areas of ensuring the financial security of the region and their priority. In work the assessment of the level of socio-economic development of the region with a view to ensuring financial security on the basis of which offers the main activities and priority areas of implementation of the investment policy that will ensure financial security of the Republic of Crimea.

Ranking and Sensitivity Analysis of Key Factors for Successful Project Management Performance: An Application of AHP for Oil and Gas Sector

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Farhaj Ishtiaq ◽  
Mirza Jahanzaib
Keyword(s):  
Sensitivity Analysis ◽  
Project Management ◽  
Analytical Hierarchy Process ◽  
Oil And Gas ◽  
Planning Process ◽  
Project Planning ◽  
Key Factors ◽  
Management Performance ◽  
Hierarchy Process ◽  
Oil And Gas Sector

<p>Complexities faced by oil and gas projects due to uncertainty and risk, demand the implementation of project management techniques for their successful completion. Therefore, this is made by using analytical hierarchy process, to identify and prioritize the key factors for successful project management performance of oil and gas projects. These factors are categorized into three groups which include attributes of project staff, project planning process and assessment of project quality. Using expert choice, a hierarchy is developed followed by pairwise comparison based upon data collection from industrial experts of oil and gas sector. Results of analytical hierarchy process (AHP) concluded that, project completion within estimated time and budget, clarity of objectives and involvement of top management are most crucial elements for improvement in project management performance of oil and gas projects. Whereas sensitivity analysis being carried out according to three different scenarios highlighted factors according to their relative importance.</p>

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