Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Graf, Thomas

doi:10.2118/171169-ms

Cited by 13 publications

(1 citation statement)

References 13 publications

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“…Ачимовские отложения находятся в зоне аномально высоких пластовых давлений, которые превышают нормальный гидростатический градиент на ~200 бар при глубине залегания пород 3500 -3800 м (Graf 2014). Система пластовых флюидов представлена в основном газом с высоким содержанием конденсата от 280 до 380 г/м 3 .…”

Section: Introductionunclassified

Tight Gas Achimov Formation Evaluation and Sampling with Wireline Logging Tools: Advanced Approaches and Technologies (Russian)

Novikov¹,

Weinheber²,

Charupa³

et al. 2015

SPE Russian Petroleum Technology Conference

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Section: Introductionunclassified

Tight Gas Achimov Formation Evaluation and Sampling with Wireline Logging Tools: Advanced Approaches and Technologies (Russian)

Novikov¹,

Weinheber²,

Charupa³

et al. 2015

SPE Russian Petroleum Technology Conference

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Best Practice of Horizontal Well Construction Operations for the Challenging, High-Pressure Achimov Formation – Urengoyskoe Field

et al. 2014

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Achimov deposits extend over 12,000 square kilometers around the city of Novy Urengoy. These deposits are characterized by high reservoir pressures, and a narrow range of drilling fluid densities that creates complicated conditions for drilling and completion of wells. Due to the high accident rate of drilling horizontal wells only S-shape wells were drilled for this formation. The first successful horizontal production well was drilled in 2013 in cooperation Arcticgaz, ERIELL, Schlumberger. The first well to drill a horizontal wellbore on Achimov formation, has been planned to open Ach3,4 and Ach5 layers of Achimov formation. In close cooperation with project operator - Arcticgaz company, engineering group of Schlumberger drilling contractor and drilling contractor developed and successfully implemented comprehensive solutions for drilling and completion of horizontal wells Achim. One of the key factors of success was the use of drilling muds Megadril-D with constant control of equivalent circulating density. Application of rotary steareable system with optimally balanced PDC bits, allowed to drill horizontal wells through Achimov deposits in record time. An additional factor for drilling risks reduction was implementation of geomechanic model, as in the preparation of the preliminary model and real-time control for wellbore stability with the latest technology logging measurements (LWD) – acoustic and density neutron formation properties. In the period for 2013 to the 2nd quarter of 2014 have been successfully constructed more than 10 similar wells. Esteblished new records: maximum closure – 2403 meters, the length of the longest subhorizontal section reached 1233 meters. Set a record duration of well construction time of 62 days vs 100 planned, which could not been reached before by anyone in the region (formerly similar wells with shorter intervals of subhorizontal sectionhave been constructed in evarage about 150 days). Recently were successfully run two completion liners for 3-stage hydraulic fracturing (MSF) and one of MSF was successfully done. For completion purposes was used OBM with the weighting agent of mikro size, provided an unprecedented stability to settlement for a long time. This article devoted to the description of technologies and solutions that have been used for the construction of sub-horizontal wells. Preliminary production index of subhorizontal wells shows that current PI higher than S-shape wells (even with frac). Positive experience in the construction of subhorizontal wells change plans to develop Achimov deposits and opens new perspectives of hydrocarbon production in the region.

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Best Practices for Horizontal Wells Completion Technology and Multistage Fracturing for High Pressure Achimov Formation at Urengoyskoe Field

et al. 2014

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Reserves of Achimov formation of Urengoyskoe gas field is approximately 3 trillion cubic meters of gas and condensate. (Total reserves of Urengoy gas field 10 trillion cubic meters). About 83 % of Achimov reserves stored in two main reservoirs Ach3-4 and Ach5. Operator Company of the gas field has hard objectives to drill sub horizontal well that will cross both mentioned formations at angle of 80-90 degrees.

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Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Cited by 13 publications

References 13 publications

Tight Gas Achimov Formation Evaluation and Sampling with Wireline Logging Tools: Advanced Approaches and Technologies (Russian)

Tight Gas Achimov Formation Evaluation and Sampling with Wireline Logging Tools: Advanced Approaches and Technologies (Russian)

Best Practice of Horizontal Well Construction Operations for the Challenging, High-Pressure Achimov Formation – Urengoyskoe Field

Best Practices for Horizontal Wells Completion Technology and Multistage Fracturing for High Pressure Achimov Formation at Urengoyskoe Field

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