Successful Implementation of PMCD Technology in Kazakhstan

Amanbayev, Yerlan; Karmanov, Kanat

doi:10.2118/191513-18rptc-ms

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…In PMCD, a sacrificial fluid is pumped through the bit nozzles to fill any fractures and caves, while a heavier fluid is pumped into the annulus to maintain the mud cap and prevent gas migration up to the surface. Today this is the most common practice for drilling in carbonates used by drilling companies [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Detection of Karstification Hazards While Drilling in Carbonates

2022

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The nature of carbonate deposition can cause the development of unique geological features such as cavities and vugs called karsts. Encountering karsts while drilling can lead to serious consequences. To improve drilling safety in intervals of karstification, it is important to detect karsts as early as possible. The use of state-of-the-art geophysical methods cannot guarantee early or even real-time detection of karsts or karstification zones. In this paper we demonstrate, based on an analysis of 20 wells drilled in karstified carbonates in the Barents Sea, that a karst that is dangerous for drilling is often surrounded by one or more other karstification objects, thus forming a karstification zone. These zones can be detected in real time through certain patterns in drillstring mechanics and mud flow measurements. They can serve as indicators of intervals with a high likelihood of encountering karsts. The identified patterns corresponding to various karstification objects are summarized in a table and can be used by drilling engineers. Apart from that, these patterns can also be utilized for training machine learning algorithms for the automatic detection of karstification zones.

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Section: Introductionmentioning

confidence: 99%

Real-Time Detection of Karstification Hazards While Drilling in Carbonates

2022

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“…In this case, the well is converted for pressurized mud cap drilling (PMCD) and drilling can be continued with the controllable pumping of sacrificial fluid and drilling cuttings into caves, fractures and other highly permeable zones. The efficiency of this approach was demonstrated by a number of wells drilled in carbonates [15][16][17][18]. However, MPDbased solutions for drilling risk minimization have limitations.…”

Section: Introductionmentioning

confidence: 99%

Prediction and Early Detection of Karsts—An Overview of Methods and Technologies for Safer Drilling in Carbonates

2021

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The nature of carbonate deposition as well as diagenetic processes can cause the development of unique geological features such as cavities, vugs and fractures. These are called karsts. Encountering karsts while drilling can lead to serious consequences such as severe mud losses, drops of bottom hole assembly and gas kicks. To improve drilling safety in intervals of karstification, it is important to detect karsts as early as possible, preferably in advance. In this paper, we review methods and technologies that can be used for the prediction and early detection of karsts. In particular, we consider acoustic, resistivity, seismic and drilling-data methods. In addition to the inventions and technologies developed and published over the past 40 years, this paper identifies the advantages, limitations and gaps of these existing technologies and discusses the most promising methods for karst detection and prediction.

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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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Successful Implementation of PMCD Technology in Kazakhstan

Cited by 7 publications

References 5 publications

Real-Time Detection of Karstification Hazards While Drilling in Carbonates

Real-Time Detection of Karstification Hazards While Drilling in Carbonates

Prediction and Early Detection of Karsts—An Overview of Methods and Technologies for Safer Drilling in Carbonates

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

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