scholarly journals Mechanical and Structural Behavior of Swelling Elastomers under Compressive Loading

2021 ◽  
Author(s):  
Sayyad Zahid Qamar ◽  
Maaz Akhtar ◽  
Tasneem Pervez
Keyword(s):  
Oil And Gas ◽  
Material Selection ◽  
Average Molecular Weight ◽  
Compressive Loading ◽  
Petroleum Industry ◽  
Numerical Studies ◽  
Oil And Gas Wells ◽  
Before And After ◽  
And Performance ◽  
Bulk Behavior

Swelling elastomers are a new breed of advanced polymers, and found increasing use in drilling of difficult oil and gas wells. It is important to know how an elastomer will behave under a given set of well conditions, especially after the initial quick-swell period. Good design depends on appropriate material selection. Results are presented in this chapter from experimental and numerical studies conducted to analyze how compressive and bulk behavior of actual oilfield elastomers changes due to swelling. Six key attributes of swelling elastomers needed for design improvement and performance analysis of elastomer seals are discussed: four mechanical properties (elastic modulus E, bulk modulus K, shear modulus G, and Poisson’s ratio ν), and two polymer structure characteristics (cross-link chain density NC, and average molecular weight MC). These parameters were experimentally determined before and after various stages of swelling for two different swelling elastomers being currently used by the regional petroleum industry, in low and high salinity brines. To strengthen the experimental results, and to be able to forecast for other elastomer materials and well conditions, tests were also simulated using the commercial FEM package ABAQUS, using the best available hyperelastic material models.

Corrosion-Resistant Alloys for Tubings and Casings and Alloy Material Selection in Oil and Gas Wells

2013 ◽  
Vol 690-693 ◽  
pp. 276-279
Author(s):  
Ling Feng Li
Keyword(s):  
Oil And Gas ◽  
Material Selection ◽  
Influence Factors ◽  
Gas Wells ◽  
Corrosion Resistant ◽  
Resistant Alloy ◽  
Alloy Material ◽  
Oil And Gas Wells ◽  
Corrosion Resistant Alloy ◽  
Selection For

This paper presents the technology background, the types and basic compositions of corrosion-resistant alloys for tubings and casings in oil and gas wells, modes of corrosion and influence factors for corrosion-resistant alloy, corrosion-resistant alloys material selection for tubings and casings in oil and gas wells. And the technology above has a good practicality for application .

Pre-Delivery Testing of Centrifugal Compressors Within the Petroleum Industry: A User’s View

2004 ◽  
Author(s):  
Mahdi Taherimoghaddam ◽  
Halat Binaie
Keyword(s):  
Performance Test ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Large Percentage ◽  
Crucial Importance ◽  
Centrifugal Compressors ◽  
Unit Test ◽  
And Performance ◽  
Capital Value

In oil and gas applications where centrifugal compressors play a central role, their availability is essential for continued production; typically the loss of a day’s revenue can far exceed the capital value of the machine. Performing more rigorous inspection and testing prior to accepting delivery of centrifugal compressors can reveal a fairly large percentage of mechanical and performance failures. This paper is devoted to illustrate the crucial importance of centrifugal compressors testing within the petroleum industry with a special attention to the performance test and complete-unit test.

FE Simulation of Torque and Drag inside Borehole of Oil and Gas Wells (Part II)

2015 ◽  
Vol 723 ◽  
pp. 240-245
Author(s):  
Yousif E.A. Bagadi ◽  
De Li Gao ◽  
Abdelwahab M. Fadol
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth.The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. A FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results.The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

FE Simulating of Torque and Drag inside Borehole of Oil and Gas Wells

2014 ◽  
Vol 1030-1032 ◽  
pp. 781-785
Author(s):  
Yousif E.A. Bagadi ◽  
Abdelwahab M. Fadol ◽  
De Li Gao
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth. The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. a FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results. The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

Design optimization of a pneumatic-powered drilling tool thrust assembly

1998 ◽  
Vol 212 (2) ◽  
pp. 165-170
Author(s):  
G L Ferguson ◽  
R Samineni ◽  
P W Johnson
Keyword(s):  
Carrying Capacity ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Power Source ◽  
Gas Wells ◽  
Drilling Tool ◽  
Oil And Gas Wells ◽  
Flow Through ◽  
Stress Raisers ◽  
Drilling Bit

The petroleum industry is dependent on developing more efficient means of drilling oil and gas wells. A prototype of a new design has been recently demonstrated which places the drilling power source (a pneumatic turbine) down-hole with the drilling bit. However, the thrust assembly shaft used to connect the power source to the bit was not optimally designed. Because of constraints placed on the geometry of the thrust assembly, severe stress raisers exist and these cannot be predicted by traditional analytical means. The conflicting requirements for increasing air flow through the internal passages in the thrust shaft while maintaining the torque-carrying capacity were studied to develop the guidelines for optimizing the thrust assembly.

scholarly journals Acid Treatment as a Way to Reduce Shale Rock Mechanical Strength and to Create a Material Prone to the Formation of Permanent Well Barrier

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2342
Author(s):  
Kamila Gawel ◽  
Maksym Lozovyi ◽  
Mohammad Hossain Bhuiyan ◽  
Ruben Bjørge ◽  
Erling Fjær
Keyword(s):  
Mechanical Properties ◽  
Oil And Gas ◽  
Etching Rate ◽  
Gas Wells ◽  
Shale Formations ◽  
X Ray ◽  
Swelling Clays ◽  
Oil And Gas Wells ◽  
Shale Sample ◽  
Before And After

Utilization of natural shale formations for the creation of annular barriers in oil and gas wells is currently discussed as a mean of simplifying cumbersome plugging and abandonment procedures. Shales that are likely to form annular barriers are shales with high content of swelling clays and relatively low content of cementation material (e.g., quartz, carbonates). Shales with large content of quartz and low content of swelling clays will be rather brittle and not easily deformable. In this paper we ask the question whether and to what extent it is possible to modify the mechanical properties of relatively brittle shales by chemically removing some cementation material. To answer this question, we have leached out carbonates from Pierre I shale matrix using hydrochloric acid and we have compared mechanical properties of shale before and after leaching. We have also followed leaching dynamics using X-ray tomography. The results show that removal of around 4–5 wt% of cementation material results in 43% reduction in Pierre I shale shear strength compared to the non-etched shale exposed to sodium chloride solution for the same time. The etching rate was shown to be strongly affected by the volume of fluid staying in direct contact with the shale sample.

scholarly journals Corrosion Processes Relevant to the Integrity of Oil and Gas Facilities1

2017 ◽  
Vol 8 (1) ◽  
pp. 14-21
Author(s):  
Morten A. Langøy ◽  
Erik Hörnlund ◽  
Ole Jacob Næss ◽  
Rolf H. Hinderaker
Keyword(s):  
Emergency Preparedness ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Material Selection ◽  
Selection Process ◽  
Petroleum Industry ◽  
International Standards ◽  
Life Extension ◽  
Protection Measures ◽  
High Level

The Petroleum Safety Authority (PSA) Norway will set the terms for and follow up that players in the Norwegian petroleum industry maintain a high level of health, safety and the environment and emergency preparedness, and thereby contribute to creating the highest possible value for society. Ensuring good material selection process and structural integrity is an important effort where different corrosion forms are of concern and corrosion protection measures of interest, especially in respect to major accidents.PSA addresses corrosion in rules and regulations, requiring “robust material selection”, with reference to international standards and guidelines. The operators addressing and monitoring of the corrosion effects on the process and structural integrity by incident reporting, reviews and site audits are the key tools for PSA in assessing the corrosion challenges and control in the industry.It is of paramount importance to avoid major accidents. The subject of this paper is to address the challenges with material degradation in ageing structures, and the challenges associated with life extension considerations. Corrosion plays a major role in this respect; especially PSA is concerned with corrosion under insulation (CUI). This paper presents some of our work in these areas.

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