Unconventional Engineering Toward Efficient Geosteering and Well Placement - Logging-While-Drilling in an Oil-Based Mud Environment

2021 ◽  
Author(s):  
Salaheldeen S Almasmoom ◽  
Gagok I Santoso ◽  
Naif M Rubaie ◽  
Javier O Lagraba ◽  
David B Stonestreet ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Horizontal Well ◽  
New Technology ◽  
Significant Risk ◽  
Directional Drilling ◽  
Cross Sectional ◽  
Well Placement ◽  
Formation Evaluation ◽  
Logging While Drilling ◽  
New Generation

Abstract This paper presents a success story of deploying new technology to improve geosteering operations in an unconventional horizontal well. A new-generation logging-while-drilling (LWD) imaging tool, that provides high resolution resistivity and ultrasonic images in an oil-based mud environment, was tested while drilling a long lateral section of an unconventional horizontal well. In addition to improving the geosteering operations, this tool has proven the ability to eliminate the wireline image log requirements (resistivity and ultrasonic), hence reducing rig time significantly. The LWD bottomhole-assembly (BHA) included the following components: gamma ray (GR), density, neutron, resistivity, sonic, density imager, and the newly deployed dual imager (resistivity and ultrasonic). The dual imager component adds an additional 15-ft sub to the drilling BHA, which includes four ultrasonic sensors orthogonal to each other, and two electromagnetic sensors diametrically opposite to each other (reference figure 1). This new technology was deployed in an unconventional horizontal well to help geosteer the well in the intended zone, which led to an improvement in well placement, enhanced the evaluation of the lateral facies distribution, and allowed better identification of natural fractures. The dual images provided the necessary information for interpreting geological features, drilling induced features, and other sedimentological features, thus enhancing the multistage hydraulic fracturing stimulation design. In addition, an ultrasonic caliper was acquired while drilling the curve and lateral section, providing a full-coverage image of the borehole walls and cross-sectional borehole size. The unique BHA was designed to fulfill all the directional drilling, formation evaluation and geosteering requirements. A dynamic simulation was done to confirm the required number of stabilizers, and their respective locations within the BHA, to reduce shock and vibration, borehole tortuosity and drilling related issues, thereby improving over-all performance. Real-time drilling monitoring included torque and drag trending, back-reaming practices and buckling avoidance calculations, which were implemented to support geosteering, and for providing a smooth wellbore for subsequent wireline and completion operations run in this well. A new generation dual-image oil-based mud environment LWD tool was successfully deployed to show the multifaceted benefits of enhanced geo-steering/well placement, formation evaluation, and hydraulic fracturing design in an unconventional horizontal well. Complexities in the multifunctioning nature of the BHA were strategically optimized to support all requirements without introducing any significant risk in operation.

Optimizing Horizontal Well Placement with Reservoir Characterized Modeling and Advanced Logging While Drilling Technologies

2014 ◽  
Author(s):  
Qiang Li ◽  
Quan Sheng Ge ◽  
Feng Guo Xia ◽  
Wang Xing Zhang ◽  
Peng Kang ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Well Placement ◽  
Logging While Drilling

Optimum Horizontal Well Placement in Very-Low-Resistivity Reservoir With a Directional and Deep Logging-While-Drilling Technology

2007 ◽  
Author(s):  
Augusto Cesar Carvalho da Silva ◽  
Jose Antonio Cavero ◽  
Waldyr Rodriguez ◽  
Johana Vargas ◽  
Marco Augusto ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Well Placement ◽  
Low Resistivity ◽  
Drilling Technology ◽  
Logging While Drilling

Sourceless Well Placement and Formation Evaluation with Logging While Drilling Technologies

2017 ◽  
Author(s):  
Shaikh Abdul Azim ◽  
Chao Chen ◽  
Anar Abdulkarim ◽  
Ahmet Aki ◽  
Mohamed Samie
Keyword(s):  
Well Placement ◽  
Formation Evaluation ◽  
Logging While Drilling

Novel Coiled Tubing Perforation Approach Enables Efficient Multistage Hydraulic Fracturing Operations in a Horizontal Well in Oman

2016 ◽  
Author(s):  
Ali Al-Ghaithi ◽  
Fahad Alawi ◽  
Ernest Sayapov ◽  
Ehab Ibrahim ◽  
Najet Aouchar ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Horizontal Well ◽  
Multistage Hydraulic Fracturing ◽  
Coiled Tubing

Evaluation of Hydraulic Fracturing Models and Their Limitations to Predict No-Drill Zones for Horizontal Directional Drilling

2018 ◽  
Author(s):  
Saeed Delara ◽  
Kendra MacKay
Keyword(s):  
Hydraulic Fracturing ◽  
Safety Factor ◽  
Standard Procedure ◽  
Accurate Determination ◽  
Strength Properties ◽  
Analytical Models ◽  
Alternative Methods ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
The Impact

Horizontal directional drilling (HDD) has become the preferred method for trenchless pipeline installations. Drilling pressures must be limited and a “no-drill zone” determined to avoid exceeding the strength of surrounding soil and rock. The currently accepted industry method of calculating hydraulic fracturing limiting pressure with application of an arbitrary safety factor contains several assumptions that are often not applicable to specific ground conditions. There is also no standard procedure for safety factor determination, resulting in detrimental impacts on drilling operations. This paper provides an analysis of the standard methods and proposes two alternative analytical models to more accurately determine the hydraulic fracture point and acceptable drilling pressure. These alternative methods provide greater understanding of the interaction between the drilling pressures and the surrounding ground strength properties. This allows for more accurate determination of horizontal directional drilling limitations. A comparison is presented to determine the differences in characteristics and assumptions for each model. The impact of specific soil properties and factors is investigated by means of a sensitivity analysis to determine the most critical soil information for each model.

scholarly journals Monitoring migrant groups as a post-validation surveillance approach to contain the potential reemergence of lymphatic filariasis in Togo

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Monique Ameyo Dorkenoo ◽  
Martin Kouame Tchankoni ◽  
Degninou Yehadji ◽  
Kossi Yakpa ◽  
Mawèké Tchalim ◽  
...  
Keyword(s):  
Lymphatic Filariasis ◽  
Significant Risk ◽  
Public Health Problem ◽  
Test Strip ◽  
Cross Sectional Study ◽  
Sub Saharan Africa ◽  
Positive Case ◽  
Cross Sectional ◽  
Case Investigation ◽  
Migrant Groups

Abstract Background In March 2017, Togo was declared the first country in sub-Saharan Africa to eliminate lymphatic filariasis as a public health problem, but post-validation surveillance has been lacking. In some areas of the country, migrant groups from neighboring countries that are still endemic for LF pose a risk of reintroduction of LF to Togo. The objective of this study was to identify the risk posed by migrant groups by measuring their prevalence of LF infection and investigating any positive case using Togo’s case investigation algorithm to prevent resurgence of LF and sustain Togo’s elimination success. Method A cross-sectional study was conducted in 2018 in the northernmost region of the country. Three migrant populations were identified: (i) nomadic Peuhls, (ii) Togolese members of local communities who migrate annually to neighboring countries for seasonal labor, and (iii) refugees from Ghana who came to Togo because of a communal conflict in Ghana. A questionnaire was designed to collect data on demographics and history of LF and MDA; all participants were tested for circulating filariasis antigen (CFA) using the filariasis test strip (FTS). Any CFA-positive case was confirmed with nocturnal microfilaremia. Results Refugees, seasonal economic migrants and nomadic Peuhls represented 42.1%, 31.4% and 26.5% of the study participants, respectively. The overall prevalence of CFA was 4.2% (58/1391) with the highest prevalence in the nomadic Peuhl group (11.9%), but only one of them (0.07%) was confirmed positive with nocturnal microfilaremia. Using the case investigation algorithm, no other positive case was identified in the positive case’s surroundings. Conclusion This study demonstrates that nomadic Peuhls, with a CFA prevalence of 11.9%, pose a potential risk for reintroduction of LF into Togo while Ghanaian refugees and seasonal economic migrants do not appear to pose a significant risk. Periodic monitoring of migrants, especially the nomadic Peuhl population, is a potential post-validation surveillance approach that could be used to promptly detect any LF cluster that may arise.

To Study the Clinical Profile and Management of Cellulitis of Lower Limb in Northern India

2021 ◽  
pp. 153473462098667
Author(s):  
Tripta S. Bhagat ◽  
Luv Kumar ◽  
Prakhar Garg ◽  
Apoorv Goel ◽  
Amit Aggarwal ◽  
...  
Keyword(s):  
Bacterial Infection ◽  
Lower Limb ◽  
Surgical Intervention ◽  
Significant Risk ◽  
Cross Sectional Study ◽  
Common Complication ◽  
Cross Sectional ◽  
Medical College ◽  
Northern India ◽  
Working Age

Cellulitis is a bacterial infection of the dermis and subcutaneous tissues occupying a large proportion of hospital beds. This study was conducted for analysis of patients with cellulitis according to their demographics and clinical presentation and to examine their comorbidities, complications, and its management. This observational cross-sectional study was conducted in the Department of Surgery at Santosh Medical College and Hospitals involving a total of 60 cases having cellulitis and other soft tissue infections of lower limb. Analysis of their demographic profile, management, and complications was done. Cellulitis is seen commonly in males, 46 (76.6%). The mean age of patients affected by cellulitis in the study was 36.4 ± 1.23 years. The most common site affected is leg involving more people in field jobs. The most common risk factor was trauma in 46.6%, and other factors were diabetes mellitus and smoking, while abscess formation was the most common complication observed in 36.6% of cases. A total of 56.6% cases were managed conservatively, while 43.3% cases required surgical intervention. Mean hospital stay in this study was 5.02 ± 0.23 days. It was concluded that cellulitis is subcutaneous, spreading bacterial infection is more common in males, and its incidence is highest in working age group population. Lower limb is commonly involved. Trauma, smoking, and diabetes are significant risk factors for development of cellulitis. Abscess is the most common complication. About 50% patients with cellulitis can be managed conservatively and the rest require surgical intervention.

scholarly journals Prevalence and factors associated with intestinal schistosomiasis and human fascioliasis among school children in Amhara Regional State, Ethiopia

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
Teshome Bekana ◽  
Nega Berhe ◽  
Tadesse Eguale ◽  
Mulugeta Aemero ◽  
Girmay Medhin ◽  
...  
Keyword(s):  
Risk Factors ◽  
School Children ◽  
Neglected Tropical Diseases ◽  
Significant Risk ◽  
Parasitic Infections ◽  
Cross Sectional ◽  
Targeted Interventions ◽  
Intestinal Schistosomiasis ◽  
Regional State ◽  
Human Fascioliasis

Abstract Background Schistosomiasis and fascioliasis are digenean parasitic infections and are among the neglected tropical diseases that have both medical and veterinary importance. They are found mainly in areas having limited access to safe water supply and improved sanitation. Methods A cross-sectional study was conducted to determine the prevalence of Schistosoma mansoni and Fasciola species infections and to identify associated risk factors among school children in Amhara Regional State, Ethiopia. Stool specimens were collected from 798 children (419 males, 379 females) and processed using Kato-Katz and formol-ether concentration techniques. A semi-structured questionnaire was used to collect socio-demographic and other exposure information to explore potential risk factors for the infections. Results The overall prevalence of S. mansoni and Fasciola species infections was 25.6% (95% confidence interval (CI): 22.5-28.6) and 5.5% (95% CI: 3.9-7.1), respectively. S. mansoni was present in all surveyed schools with the prevalence ranging from 12.8% (16/125; 95% CI = 5.6-20.0) to 39.7% (64/161; 95% CI = 32.2-47.2) while Fasciola species was identified in five schools with the prevalence ranging from 2.5% (4/160; 95% CI = 0.001–4.9) to 9.8% (13/133; 95% CI = 4.7–14.8). The prevalence of S. mansoni infection was significantly associated with swimming in rivers (Adjusted odds ratio (AOR): 1.79, 95% CI, 1.22–2.62; P=0.003), bathing in open freshwater bodies (AOR, 2.02; 95% CI, 1.39–2.94; P<0.001) and engaging in irrigation activities (AOR, 1.69; 95% CI, 1.19-2.39; P=0.004), and was higher in children attending Addis Mender (AOR, 2.56; 95% CI, 1.20–5.46; P=0.015 ) and Harbu schools (AOR, 3.53; 95% CI, 1.64–7.59; P=0.001). Fasciola species infection was significantly associated with consumption of raw vegetables (AOR, 2.47; 95% CI, 1.23-4.97; P=0.011) and drinking water from unimproved sources (AOR, 2.28; 95% CI, 1.11–4.70; P=0.026). Conclusion Both intestinal schistosomiasis and human fascioliasis are prevalent in the study area, affecting school children. Behaviors and access to unimproved water and sanitation are among significant risk factors. The findings are instrumental for targeted interventions.

Sign in / Sign up

Export Citation Format

Share Document