Well Deviation Problem: A Case Study in an Iranian Gas Well Drilling

The purpose of this study is to improve the cementing quality of shale gas well by mud cake solidification, as well as to provide the better annular isolation for its hydraulic fracturing development. Based on the self-established experimental method and API RP 10, the effects of mud cake solidifiers on the shear strength at cement-interlayer interface (SSCFI) were evaluated. After curing for 3, 7, 15 and 30 days, SSCFI was remarkably improved by 629.03%, 222.37%, 241.43% and 273.33%, respectively, compared with the original technology. Moreover, the compatibility among the mud cake solidifier, cement slurry, drilling fluid and prepad fluid meets the safety requirements for cementing operation. An application example in a shale gas well (Yuanye HF-1) was also presented. The high quality ratio of cementing quality is 93.49% of the whole well section, while the unqualified ratio of adjacent well (Yuanba 9) is 84.46%. Moreover, the cementing quality of six gas-bearing reservoirs is high. This paper also discussed the mechanism of mud cake solidification. The reactions among H3AlO42- and H3SiO4- from alkali-dissolved reaction, Na+ and H3SiO4- in the mud cake solidifiers, and Ca2+ and OH- from cement slurry form the natrolite and calcium silicate hydrate (C-S-H) with different silicate-calcium ratio. Based on these, SSCFI and cementing quality were improved.

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

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1064/1/012059 ◽

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

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Development of an Intelligent System for the Analysis of both Static and Real-time Oil and Gas Well Drilling Data

Modern Applied Science ◽

10.5539/mas.v4n12p3 ◽

2010 ◽

Vol 4 (12) ◽

Cited By ~ 4

Author(s):

Mazeda Tahmeen ◽

Geir Hareland ◽

Behrad Rashidi ◽

Nasikul Islam

Keyword(s):

Real Time ◽

Oil And Gas ◽

Intelligent System ◽

Gas Well ◽

Well Drilling ◽

Drilling Data

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A Case Study of Hydraulic Fracturing Monitoring in Shale Gas Well Based on DAS

10.3997/2214-4609.2021613017 ◽

2021 ◽

Author(s):

S. An ◽

X. Liang ◽

G. Yu ◽

D. Li ◽

J. Wu ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Shale Gas ◽

Gas Well

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Infill Depleted Gas Well Cementing Challenges for Offshore Myanmar Drilling Operations

10.2118/201010-ms ◽

2021 ◽

Author(s):

Ajita Ang C K Ang ◽

Avinash A Kumar Kumar ◽

Syazwan B A Ghani Ghani ◽

Nann N N Maung Nann ◽

M Hanif Yusof Yusoff ◽

...

Keyword(s):

Water Production ◽

Cement Slurry ◽

Water Contact ◽

Gas Well ◽

Well Drilling ◽

Depletion Rate ◽

Open Hole ◽

Drilling Operations ◽

Sensitivity Studies ◽

Remedial Work

Abstract Infill well drilling was planned and executed to increase production in a significantly depleted field. A total of 3 infill wells were drilled in 2 different layers of reservoir for an offshore operator in Myanmar. In the offset wells, water production had become significantly higher throughout. Previously all offset wells in this field were completed with open hole sand screens was chosen to isolate the water bearing sand in the sand reservoir below. Pore pressure prognosis were calculated from offset well depletion rate. Reservoir formation properties is assumed to be same throughout the field. The first well was drilled and was found that there were two gas water contacts through the 3 targeted sand layers. The gas water contact and WUT (Water Up To) in this well were unexpected and it was prognosed that these gas water contact are there due to compartmentalization. The 7" liner were set and cemented throughout these reservoirs. The cement job went as per the plan and there were no losses recorded during cementing. However, initial cement log did not show isolation. 2 more runs of cement log were performed 6 days and 10 days later while conducting intervention activities on other wells. All three cement log came to the same conclusion, showing no isolation throughout the annulus of the 7" production liner. Significant amount of gas had percolated into the annulus over time. Despite no evidence of poor cement slurry design observed during running various sensitivity studies and post-job lab tests final cement log, which was conducted under pressure and confirmed no hydraulic isolation. A cement remedial job was planned and an investigation was conducted to identify the plausible root causes. This paper explains on the root causes of poor cement presence in the annulus, and the remedial work that took place to rectify the issue.

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