Casing Wear Prediction Model Based on Casing Ellipticity in Oil & Gas Well-Drilling With Complex Structures

2018 ◽  
Vol 85 (10) ◽  
Author(s):  
Leichuan Tan ◽  
Deli Gao
Keyword(s):  
Prediction Model ◽  
Oil And Gas ◽  
Drill Pipe ◽  
Inversion Method ◽  
Complex Structures ◽  
Oil And Gas Development ◽  
Gas Well ◽  
Wear Prediction ◽  
Well Drilling ◽  
Casing Wear

Any casing with perfect integrity within a complex oil and gas development scenario is subject to formation extrusion resulting in ellipticity. This paper proposes a novel casing wear prediction model, which encompasses ellipticity, geometric structural relationships, and the energy dissipation law at work in the casing. Composite structural wear models are also utilized to determine the influence of different drill pipe combinations on casing wear predictions. The casing wear position is predicted based on casing ellipticity. The proposed model yields more accurate casing wear predictions than previous models which do not properly account for casing ellipticity; to this effect, it may more effectively minimize the cost of drilling engineering and safeguard against accidents. The proposed method also outperformed other methods in a case study on a shale gas development project in Fuling, China. The inversion method is applicable to wells with similar structure to the drilled well, where casing wear position can be evaluated very accurately according to caliper logging system measurements. The proposed method facilitates sound decision-making while guaranteeing secure and reliable oil and gas well-drilling with complex structures.

Experimental Study and Prediction Model of Casing Wear in Oil and Gas Wells

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Zhanghua Lian ◽  
Qiang Zhang ◽  
Tiejun Lin ◽  
Kuncheng Li ◽  
Yonghui Liu
Keyword(s):  
Prediction Model ◽  
Contact Force ◽  
Oil And Gas ◽  
Economic Losses ◽  
Wear Depth ◽  
Gas Wells ◽  
Wear Prediction ◽  
Oil And Gas Wells ◽  
Casing Wear ◽  
Force Calculation

With the development of drilling technology and reinforced exploration and exploitation of unconventional reservoirs, there has been a great increase of complex wells. Meanwhile, however, consequent casing wear is and will continue to be a serious problem that causes enormous economic losses and many safety issues. The purpose of this paper is to find out the mechanism of casing wear and establish casing wear prediction model. Casing wear experiment was carried out to study the effect of contact force, rotation speed, and casing grade on wear depth. Meanwhile, wear coefficients under different working conditions were obtained through the normalizing of data. With the extensive research of downhole drag and torque calculation method, a contact force calculation model was established. Through the combination of crescent-shaped model and wear-efficiency model, the past complicated casing wear prediction models and confusing empirical formulae were greatly simplified. Therefore, the wear volume and depth of the casing string can be accurately predicted. Finally, a prediction software was developed to predict downhole casing wear of oil and gas wells. Comparison with the field data confirmed that the established model and software had enough accuracy to help predict and analyze casing wear at field.

scholarly journals Oil and gas well drilling technology based on the system approaches and the results of application

2021 ◽  
Vol 1064 (1) ◽  
pp. 012059
Author(s):  
R R Gazizov ◽  
A P Chizhov ◽  
V E Andreev ◽  
A V Chibisov ◽  
V V Mukhametshin ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Gas Well ◽  
Well Drilling ◽  
Drilling Technology ◽  
System Approaches

scholarly journals Gel Pills for Downhole Pressure Control during Oil and Gas Well Drilling

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6318
Author(s):  
Mahmoud Khalifeh ◽  
Larisa Penkala ◽  
Arild Saasen ◽  
Bodil Aase ◽  
Tor Henry Omland ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Solid Material ◽  
Static Condition ◽  
Pressure Control ◽  
Gas Well ◽  
Well Drilling ◽  
Geothermal Wells ◽  
Mitigation Action

During drilling of petroleum or geothermal wells, unforeseen circumstances occasionally happen that require suspension of the operation. When the drilling fluid is left in a static condition, solid material like barite may settle out of the fluid. Consequently, the induced hydrostatic pressure that the fluid exerts onto the formation will be reduced, possibly leading to collapse of the borehole or influx of liquid or gas. A possible mitigation action is placement of a gel pill. This gel pill should preferably be able to let settled barite rest on top of it and still transmit the hydrostatic pressure to the well bottom. A bentonite-based gel pill is developed, preventing flow of higher density drilling fluid placed above it to bypass the gel pill. Its rheological behavior was characterized prior to functional testing. The designed gel pill develops sufficient gel structure to accommodate the settled barite. The performance of the gel was tested at vertical and 40° inclination from vertical. Both conventional settling and the Boycott effect were observed. The gel pill provided its intended functionality while barite was settling out of the drilling fluid on top of this gel pill. The barite was then resting on top of the gel pill. It is demonstrated that a purely viscous pill should not be used for separating a high density fluid from a lighter fluid underneath. However, a bentonite or laponite gel pill can be placed into a well for temporary prevention of such intermixing.

Analysis of the Pressure Response of Kick Control in MPD

2014 ◽  
Vol 997 ◽  
pp. 713-716
Author(s):  
Pu Liu ◽  
Hu Yin ◽  
Tian Xiang Wang ◽  
Meng Han Si
Keyword(s):  
Oil And Gas ◽  
Fluid Pressure ◽  
Pressure Response ◽  
Control Technology ◽  
Gas Well ◽  
Well Drilling ◽  
Well Control ◽  
Overflow Control ◽  
And Control ◽  
Conventional Drilling

With narrow Density Windows wells and high pressure oil and gas well drilling growing in number, the kick risks becoming increasingly prominent and higher requirements for well control technology being needed, the manage pressure drilling (MPD) technology is used more and more widely. The problems like how to effectively find gas overflowand how to effectively control the overflow in the MPD must be solved.Well must be shuted timely in conventional drilling when overflow happens.The special characteristics of overflow control equipment determines the diversity and effectiveness of its overflow monitoring means in MPD, and the overflow is found more effectively and timely than conventional drilling. Well control risk will increase sharply if kick cannot be timely and effectively identified and controled when overflow occurs. MPD can quickly adjust the wellhead back pressure and inhibit the formation fluid further invasion. Therefore, combining with MPD process and the fluid pressure parameters, the article establishs process of kick recognition and kick control, analyses of the process and analyzes and evaluates the pressure response in process of kick control.MPD can better control the bottom hole pressure in well control situation, ensuring drilling safety. The process of kick recognition and control is of great significance to promote the development and application of kick control technology in MPD.

Influence of different laser operation regimes on the specific energy required for rock removal in oil and gas well drilling applications

2009 ◽  
Author(s):  
Florian Albert ◽  
Alexander Grimm ◽  
Michael Schmidt ◽  
Alain Cournoyer ◽  
Martin Briand ◽  
...  
Keyword(s):  
Specific Energy ◽  
Oil And Gas ◽  
Laser Operation ◽  
Gas Well ◽  
Well Drilling
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