Wellbore Stability Estimation Model of Horizontal Well in Cleat-Featured Coal Seam

2014 ◽  
Author(s):  
C. Ai ◽  
C. Hu ◽  
Y. Li ◽  
L. Yu ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Coal Seam ◽  
Horizontal Well ◽  
Wellbore Stability ◽  
Estimation Model ◽  
Stability Estimation

Pushing the boundaries – deployment of innovative drilling, completion and production technology to advance a deep coal seam play

2019 ◽  
Vol 59 (2) ◽  
pp. 770
Author(s):  
Romi Branajaya ◽  
Peter Archer ◽  
Andrew Farley
Keyword(s):  
Coal Seam ◽  
Real Time ◽  
Horizontal Well ◽  
Fracture Network ◽  
Wellbore Stability ◽  
Diagnostic Tools ◽  
Well Performance ◽  
Vertical Well ◽  
Gas Desorption ◽  
Multi Stage

Following technical success of vertical and deviated wells, Strike Energy audaciously continued to push the envelope while proving the commerciality of the deep coal seam play in PEL96. It was clear that extending the reservoir contact area of the wellbore and using innovative dewatering to significantly increase drainage was prudent. A horizontal well intercepting a vertical well coupled with multi-stage fracture stimulation was selected to achieve that goal. Furthermore, a new application of wide operating range electric submersible pumps would enable dewatering to much lower water rates to avoid running the pumps dry or damaging the fracture network upon gas desorption and breakthrough. Although a wellbore stability issue was encountered during the well construction phase, requiring a modified well trajectory, the horizontal well successfully intercepted the vertical well, reaching planned total measured depth. It also altered fracture stimulation approach to an indirect vertical fracture completion application, whereby fractures are initiated from the interburden layer below the coal seam. A million pounds of proppant was successfully placed in seven fracture stages. During the proppant pumping, diagnostic tools (tiltmeter and microseismic) and chemical tracers were utilised. The real-time microseismic confirmed the propagation of fracture from interburden upwards into the target coal seam. This presents the integration of well performance, subsurface information, past drilling practices and stimulation treatment results to support the decision-making process of a horizontal well construction and stimulation design as well as integration of real-time information to overcome operation difficulties and optimise well delivery. Tracer samplings and ongoing production testing during dewatering are also presented.

Establishment of Thermal Stability Estimation Model of the Power Battery

2012 ◽  
Vol 512-515 ◽  
pp. 1089-1094
Author(s):  
Hong Wei Wang ◽  
Hai Qing Xiao ◽  
Shuang Deng ◽  
Chao Wang
Keyword(s):  
Thermal Stability ◽  
Cusp Catastrophe ◽  
Estimation Model ◽  
Stability Estimation ◽  
Power Battery ◽  
Safety And Reliability ◽  
On Line ◽  
And Control ◽  
Cusp Catastrophe Theory ◽  
Thermal Stability Of

It is very important to monitor and estimate thermal stability of the power battery because that the thermal runaway will happen at some high temperature. Therefore, this study was focused on thermal stability estimation of the power battery thermal stability. The thermal stability estimation model consists of collect module, judge module, cusp catastrophe estimation module and control module. The important module is cusp catastrophe estimation module which was established based on cusp catastrophe theory. The experimental results show that thermal stability estimation model of the power battery works well. Therefore, thermal stability estimation model of the power battery is helpful to monitor and estimate the safety and reliability of power battery on line.

Study on Drilling and Completion Techniques of Horizontal well for Coalbed Methane

2014 ◽  
Vol 513-517 ◽  
pp. 2586-2589 ◽  
Author(s):  
Xin Feng Du ◽  
Yong Zhe Zhao
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Mining Area ◽  
Variable Density ◽  
Technical Problems ◽  
Development Direction ◽  
Drilling Technology ◽  
The Many

Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.

Modeling transient flow behavior of a horizontal well in a coal seam

2012 ◽  
Vol 92 ◽  
pp. 54-68 ◽  
Author(s):  
Ren-Shi Nie ◽  
Ying-Feng Meng ◽  
Jian-Chun Guo ◽  
Yong-Lu Jia
Keyword(s):  
Coal Seam ◽  
Horizontal Well ◽  
Transient Flow ◽  
Flow Behavior

scholarly journals Hydraulic fracture initiation theory for a horizontal well in a coal seam

2013 ◽  
Vol 10 (2) ◽  
pp. 219-225 ◽  
Author(s):  
Bing Hou ◽  
Mian Chen ◽  
Zheng Wang ◽  
Jianbo Yuan ◽  
Ming Liu
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracture ◽  
Horizontal Well ◽  
Fracture Initiation

The Essence of Horizontal Drilling Challenges in Depleted Reservoirs

2021 ◽  
Author(s):  
Rida Mohamed Elgaddafi ◽  
Victor Soriano ◽  
Ramadan Ahmed ◽  
Samuel Osisanya
Keyword(s):  
Pore Pressure ◽  
Horizontal Well ◽  
New Technology ◽  
Horizontal Wells ◽  
Stability Loss ◽  
Wellbore Stability ◽  
Planning Stage ◽  
Horizontal Drilling ◽  
Infill Drilling ◽  
Drilling Operations

Abstract Horizontal well technology is one of the major improvements in reservoir stimulation. Planning and execution are the key elements to drill horizontal wells successfully, especially through depleted formations. As the reservoir has been producing for a long time, pore pressure declines, resulting in weakening hydrocarbon-bearing rocks. Drilling issues such as wellbore stability, loss circulation, differential sticking, formation damage remarkably influenced by the pore pressure decline, increasing the risk of losing part or even all the horizontal interval. This paper presents an extensive review of the potential issues and solutions associated with drilling horizontal wells in depleted reservoirs. After giving an overview of the depleted reservoir characteristics, the paper systematically addresses the major challenges that influence drilling operations in depleted reservoirs and suggests solutions to avoid uncontrolled risks. Then, the paper evaluates several real infill drilling operations through depleted reservoirs, which were drilled in different oilfields. The economic aspect associated with potential risks for drilling a horizontal well in depleted reservoirs is also discussed. The most updated research and development findings for infill drilling are summarized in the article. It is recommended to use wellbore strengthening techniques while drilling a horizontal well through highly depleted formations. This will allow using higher mud weight to control unstable shales while drilling through the production zone. Managed Pressure Drilling should be considered as the last option for highly depleted formations because it will require a greater level of investment which is not going to have a superior rate of return due to the lack of high deliverability of the reservoir. Using rotary steerable systems is favored to reduce risks related to drilling through depleted formations. Precise analysis of different drilling programs allows the drilling team to introduce new technology to reduce cost, improve drilling efficiency and maximize profit. It is the responsibility of the drilling engineer to evaluate different scenarios with all the precautions needed during the planning stage to avoid unexpected issues. The present market conditions and the advancement in technologies for drilling horizontal wells increase the feasibility of producing the depleted reservoirs economically. This paper highlights the challenges in drilling horizontal wells in highly depleted reservoirs and provides means for successfully drilling those wells to reduce risks while drilling

Increasing Coal Seam Gas Field Productivity with Horizontal Well Technology: A Case Study

2018 ◽  
Author(s):  
Xuejun Lin ◽  
Graham Sutherland ◽  
Duncan Cumming ◽  
Brian Thomas ◽  
Ali Sani
Keyword(s):  
Coal Seam ◽  
Horizontal Well ◽  
Coal Seam Gas ◽  
Gas Field
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