Successful Implementation of PMCD Technology in Kazakhstan (Russian)

Amanbayev, Yerlan; Karmanov, Kanat

doi:10.2118/191513-18rptc-ru

Cited by 7 publications

(1 citation statement)

References 0 publications

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“…Mitigation of these problems by adding Lost Circlation Material (LCM) may give only a short-term effect and cannot help when big karsts need to be plugged [12]. The use of Pressurized Mud Cap Drilling (PMCD), when a sacrificial fluid is pumped through the bit nozzles to fill karsts, is today the most common solution to dealing with total losses in carbonates [13][14][15]. However, rigs are not always equipped with a Rotational Control De-vice (RCD) [16] required for PMCD and a significant volume of sacrificial drilling fluid may not be readily available.…”

Section: Introductionmentioning

confidence: 99%

Automated Pattern Recognition in Real-Time Drilling Data for Early Karst Detection

Maksimov

Løken

Pavlov

et al. 2021

Volume 10: Petroleum Technology

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Drilling in carbonate formations often poses a real challenge to operators, contractors and service companies. Severe fluid losses, gas kicks and other unwanted situations increase drilling risks. These risks are closely related to drilling through karsts — vugs, cavities and fractures. Therefore it is important to detect karsts early enough to avoid drilling into them or, once drilling in a karstification region is detected, to prepare risk mitigating actions. Some geophysical methods can be used for karsts detection, however, they have limitations and cannot guarantee early detection of karsts. One of the recent studies has shown that certain patterns in real-time drilling data can serve as indicators of zones with a higher likelihood of encountering karsts. In this paper, we demonstrate how these patterns can be detected in an automated manner with an adaptive differential filter algorithm. The method has been validated on real drilling data.

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Section: Introductionmentioning

confidence: 99%

Automated Pattern Recognition in Real-Time Drilling Data for Early Karst Detection

Maksimov

Løken

Pavlov

et al. 2021

Volume 10: Petroleum Technology

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The First Implementation of MPD Technology in Conditions of Brine with AHRP at Kovykta Gas Condensate Field

Tomchenko¹,

Kulikov²,

Velyiev³

et al. 2020

Day 3 Wed, October 28, 2020

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This article describes general information about the geological structure, the identified complications during the construction of wells at the Kovykta gas condensate field associated with abnormally high reservoir pressure (AHRP). Based on the initial data and analysis of previously drilled wells, the requirements for equipment, the choice of drilling fluid density and the applied engineering solutions were formed. The goals and objectives of the project are outlined and the conditions in the process of drilling the section are presented, technological schemes and procedures are compiled during operation. Introductory training on managed pressure drilling technology was conducted with the personnel of the drilling and oilfield service companies. The revealed new mining and geological conditions and the complications that arose with them, and well-timed decisions allowed us to achieve the design depth of the section. The possibility of using brine for drilling the section using mudcap drilling technology was also confirmed. According to the final data, after drilling and fastening the section, new goals have been set for new wells at AHRP intervals. During the section drilling, various works were repeatedly performed in the presence of wellhead excess pressure, but the developed procedures, analysis, and risk assessment allowed to complete the project without incidents or accidents. Based on the gained experience, a number of decisions were made to optimize the well construction process at the field.

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Step Change in Controlling the Gas-Cap in Highly Depleted and Fractured Formation

Sheidi¹,

Balushi²,

Rawahi³

et al. 2022

Day 4 Thu, November 03, 2022

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This paper discusses the successful trials of a new approach to drill Formation-A Reservoir in Field-A. Field-A is one of the most challenging fields in the Sultanate of Oman due to the presence of a gas cap combined with total losses encountered when penetrating a highly fractured and depleted shallow reservoir. Several unsuccessful attempts had been made in the past to overcome the challenge of total losses using conventional methods (LCM, cement plug, etc). Since then, it was agreed to stop the attempts to cure these losses and control these wells instead with a unique well control situation through dynamic filling, which is a continuous pumping of water (70 - 120 m3/hr depending on the hole size) in the annulus. This method acts as primary barrier by having higher downward velocity of water than upward velocity of gas. However due to large amounts of water being pumped into the reservoir, it caused a commercial impact on oil production due to water flow back in production and large number of emissions (12 T/year/well) from this unproductive operation. The other downside of dynamic fill method is the risk of well process safety due to it relies heavily on human behavior and actions. There are many cases where the filling was interrupted by different factors. The team carried out a study on the existing process of drilling 8 ½" and 6 ⅛" holes with a view of eliminating the need for dynamic fill practice. This led to the selection of Nitrogen Cap Drilling (NCD), which is a variation of the Managed Pressure Drilling technique (MPD) technique. NCD is a closed-loop drilling system with no returns to surface based on the presence of a nitrogen cushion establishing the communication between surface and a reduced liquid column in the annulus. The well is continuously monitored, and the annulus pressure is controlled through the wellhead pressure and a balanced fluid level without the need for filling while drilling with total losses. In 2021, the team delivered 2 (two) trial wells with NCD technique successfully without interruption and saving approximately 8,300 m3 of water compared to conventional drilling. NCD allows the pneumatic pressure communication via a pressurized nitrogen column on top of the Heavy Annulus Mud (HAM) balancing the formation pressure. The positive wellhead pressure allows better control of the well behavior and monitor potential gas migration. A positive injectivity test confirmed the applicability of the NCD technique to contain the drilling fluid and drive the cuttings back into the formation. During the drilling process, well site water is injected down the drill string and HAM is injected intermittently in the annulus form the back side of the RCD based on the annulus surface pressure changes related to the gas migration. Tripping out of hole was done using NCD keeping the well balanced and monitored to avoid gas migration to surface. This technology is a step change in our journey to address drilling high-risk Formation-A gas-cap wells in Oman with the NCD concept. It addresses the Well Process Safety concerns, generates a huge value by accelerating oil production from the drilled wells without affecting the nearby ones and finally improves the environment sustainability goals in PDO’s drilling operations.

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Successful Implementation of PMCD Technology in Kazakhstan (Russian)

Cited by 7 publications

References 0 publications

Automated Pattern Recognition in Real-Time Drilling Data for Early Karst Detection

Automated Pattern Recognition in Real-Time Drilling Data for Early Karst Detection

The First Implementation of MPD Technology in Conditions of Brine with AHRP at Kovykta Gas Condensate Field

Step Change in Controlling the Gas-Cap in Highly Depleted and Fractured Formation

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