Water Control Success in Onshore and Offshore Horizontal Wells Completed With Slotted Liners by Annular Isolation - Case Studies From China

2014 ◽  
Author(s):  
Falin Wei ◽  
Yuzhang Liu ◽  
Chunming Xiong ◽  
He Liu ◽  
Yikun Li ◽  
...  
Keyword(s):  
Case Studies ◽  
Horizontal Wells ◽  
Water Control

A Novel Double-Group Crosslinked Hydrogel with High Thixotropy for Water Control in Horizontal Wells

SPE Journal ◽  
2020 ◽  
pp. 1-15
Author(s):  
Gang Li ◽  
Lifeng Chen ◽  
Meilong Fu ◽  
Lei Wang ◽  
Yadong Chen ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Gelation Time ◽  
Horizontal Wells ◽  
Uniform Grid ◽  
Drilling Fluids ◽  
Water Production ◽  
Water Control ◽  
Recovery Coefficient ◽  
Metastable Structure ◽  
Control Water

Summary Horizontal wells that are completed with slotted liners often suffer from a severe water-production problem, which is detrimental to oil recovery. It is because the annulus between the slotted liners and wellbore cannot be fully filled with common hydrogels with poor thixotropy, which determines the ultimate hydrogel filling shape in the annulus. This paper presents a novel hydrogel with high thixotropy to effectively control water production in horizontal wells. This study is aimed at evaluating the thixotropic performance, gelation time, plugging performance, and degradation performance. The thixotropic performance of the new hydrogel was also investigated by measuring its rheological properties and examining its microstructures. It was found that the new hydrogel thickened rapidly after shearing. Its thixotropic recovery coefficient was 1.747, which was much higher than those of traditional hydrogels. The gelation time can be controlled in the range of 2 to 8 hours by properly adjusting the concentrations of the framework material, crosslinker, and initiator. The hydrogel could be customized for mature oil reservoirs, at which it was stable for more than 90 days. A series of laboratory physical modeling tests showed that the breakthrough pressure gradient and the plugging ratio of the hydrogel in sandpacks were higher than 9.5 MPa/m and 99%, respectively. At the same time, it was found that the hydrogel has good degradation properties; the viscosity of the hydrogel breaking solution was 4.22 mPa·s. Freeze-etching scanning-electron-microscopy examinations indicated that the hydrogel had a uniform grid structure, which can be broken easily by shear and restored quickly. This led to the remarkable thixotropic performance. The formation of a metastable structure caused by the electrostatic interaction and coordination effect was considered to be the primary reason for the high thixotropy. The successful development of the new thixotropic hydrogel not only helps to control water production from the horizontal wells, but also furthers the thixotropic theory of hydrogel. This study also provides technical guidelines for further increasing the thixotropies of drilling fluids, fracturing fluids, and other enhanced-oil-recovery polymers that are commonly used in the petroleum industry.

Innovative Water Control Technique for Horizontal Wells in Isotropic Reservoirs - Successful Case History From Belayim Field

2015 ◽  
Author(s):  
Ahmed. F. El Gogary ◽  
Hossam. H. El-Masry ◽  
Mostafa. M. Kortam ◽  
Hany. R. El-Rayek
Keyword(s):  
Case History ◽  
Horizontal Wells ◽  
Control Technique ◽  
Water Control ◽  
Successful Case

scholarly journals Research of water control technology for horizontal wells in water-driven reservoirs

2018 ◽  
Vol 2 (2) ◽  
pp. 210-217
Author(s):  
Baobing Shang ◽  
Xiaodong Han ◽  
Shuai Li ◽  
Kouqi Liu
Keyword(s):  
Horizontal Wells ◽  
Control Technology ◽  
Water Control

INTERPRETATION OF LWD ACOUSTIC BOREHOLE IMAGE LOGS: CASE STUDIES FROM NORTH AMERICAN SHALE PLAYS

2021 ◽  
Author(s):  
Bo Gong ◽  
◽  
Ela Manuel ◽  
Youfang Liu ◽  
David Forand ◽  
...  
Keyword(s):  
Case Studies ◽  
Reservoir Characterization ◽  
Low Cost ◽  
Horizontal Wells ◽  
Drilling Fluids ◽  
Imaging Tool ◽  
Bedding Planes ◽  
Drilling Parameters ◽  
Acoustic Images ◽  
Formation Property

Logging-while-drilling (LWD) acoustic imaging technology emerged in the past few years as a low-cost solution to detect and characterize fractures in high-angle and horizontal wells. This type of imaging tool works in either water-based or oil-based drilling fluids, making it a competitive choice for logging unconventional shale wells, which are often drilled with oil-based mud. With high-resolution acoustic amplitude and travel-time images, fractures, bedding planes and other drilling-related features can be identified, providing new insights for reservoir characterization and wellbore geomechanics. The quality of LWD acoustic images however is directly affected by drilling parameters and borehole conditions, as the received signal is sensitive to formation property and wellbore changes at the same time. As a result, interpretation can be quite challenging, and caution needs to be taken to differentiate actual formation property changes from drilling-related features or image artifacts. This paper demonstrates the complexity of interpreting LWD acoustic images through multiple case studies. The examples were collected from vertical and horizontal wells in multiple shale plays in North America, with the images logged and processed by different service companies. Depending on the geology and borehole conditions, various features and artifacts were observed from the images, which can be used as a reference for geologists and petrophysicists. Images acquired with different drilling parameters were compared to show the effect of drilling conditions on image quality. Recommendations and best practices of using this new type of image log are also shared.

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