Experience of Gas Wells Development in Complex Carbonate Reservoirs in Different Stages of Development

Volkov, Vladimir; Turapin, Alexey; Ermilov, Andrey; Vasyutkin, Stanislav; Fomin, Denis; Sorokina, Anastasia

doi:10.2118/196915-ms

Cited by 3 publications

(2 citation statements)

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“…In such complicated conditions, the main task is to control the fluid loss during well killing operations. In world practice, two basic physical principles are used to reduce fluid loss during well service: increasing the blocking fluids viscosity and Blocking of pores (fractures) and channels of filtration by solid particles (Dandekar, 2013;Rogachev and Kondrashev, 2016;Petrov et al, 2008;Ryabokon, 2009;Galimkhanov, 2019;Volkov, 2019). These principles are implemented in blocking compositions, which are aqueous solutions, emulsions, crosslinked polymer gels, and dispersed systems with solid or gas phases (Figure 1) (Islamov et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Specifics of Well Killing Technology During Well Service Operation in Complicated Conditions

Mardashov¹,

Islamov²,

Nefedov³

2020

PTQ

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The process of the well killing operations in the oil and gas condensate field in Volga-Ural province is complicated due to several conditions like fractured carbonate reservoir, abnormally low reservoir pressure, high gas-oil ratio, high hydrogen sulfide content, acid fracturing, and hydrochloric acid treatments requirement. During the well killing process, significant gas breakthroughs and fluid loss are observed in this field, which requires significant usage of blocking compositions (up to 50-100 m3 per single well) and increases the well service costs. The aim of this work was to increase the well killing efficiency during well service by studying the mechanisms that take place near the wellbore zone during this process. The application of statistical and multifactor analysis of well-killing processes were conducted from 2018 to 2019, which allowed highlighting the main reasons for the low success of these works. The calculation results showed that the stress state near the well significantly differs from the regional stress field and varies depending on the generated pressure in the well, which in turn affects the activity of fractures near the wellbore. The revealed mechanisms that take place near the wellbore zone coupled with the laboratory and pilot tests of the blocking compositions can be used to improve the well service operations at the oil and gas condensate field in the Volga-Ural province. In this work, it was concluded that it is important to use the geomechanical approach to increase the well killing efficiency in combination with a complex of laboratory rheological and filtration tests of blocking compositions.

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Section: Introductionmentioning

confidence: 99%

Specifics of Well Killing Technology During Well Service Operation in Complicated Conditions

Mardashov¹,

Islamov²,

Nefedov³

2020

PTQ

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“…• alignment of the injectivity profile of formations containing highly drained zones (interlayers) [12,13].…”

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confidence: 99%

Development of technological solutions for reliable killing of wells by temporarily blocking a productive formation under ALRP conditions (on the example of the Cenomanian gas deposits)

Gasumov¹,

Minchenko²,

Гасумов

2022

PMI

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Modern field operation conditions are characterized by a decline in gas production due to the depletion of its reserves, a decrease in reservoir pressure, an increase in water cut, as well as due to the depreciation of the operating well stock. These problems are especially specific at the late stage of development of the Cenomanian deposits of Western Siberia fields, where the anomaly factor below 0.2 prevails, while gas-bearing formations are represented mainly by complex reservoirs with high-permeability areas. When killing such wells, the classical reduction of overbalance by reducing the density of the process fluid does not provide the necessary efficiency, which requires the search for new technical and technological solutions. In order to prevent the destruction of the reservoir and preserve its reservoir properties during repair work in wells with abnormally low reservoir pressure, AO “SevKavNIPIgaz” developed compositions of special process fluids. A quantitative description of the process of blocking the bottomhole formation zone is proposed by means of mathematical modeling of injection of a gel-forming solution into a productive horizon. The well killing technology includes three main stages of work: leveling the injectivity profile of the productive strata using three-phase foam, pumping the blocking composition and its displacement with the creation of a calculated repression. Solutions obtained on the basis of a mathematical model allow optimizing technological parameters to minimize negative consequences in the well killing process.

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Well Killing Technology before Workover Operation in Complicated Conditions

et al. 2021

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Well killing is an important technological stage before conducting workover operation, one of the tasks of which is to preserve and restore the natural filtration characteristics of the bottomhole formation zone (BFZ). Special attention should be paid to the choice of well killing technologies and development of wells in complicated conditions, which include abnormally low reservoir pressure, high oil-gas ratio and carbonate reservoir type. To preserve the filtration characteristics of the productive formation and prevent fluid losses in producing wells during well killing operation, blocking compositions are used. At the same time, an informed choice of the most effective well killing technologies is required. Consequently, there is a need to conduct laboratory physicochemical and coreflood experiments simulating geological, physical, and technological conditions of field development, as similar as possible to actual reservoir conditions. The article presents the results of experimental studies on the development well killing technologies of producing wells during workover operation in various geological, physical, and technological conditions of oil field development. Physicochemical and coreflood laboratory experiments were carried out with the simulation of the processes of well killing and development of wells in reservoir conditions with the use of modern high-technology equipment in the Enhanced Oil Recovery Laboratory of the Department of Development and Operation of Oil and Gas Fields at St. Petersburg Mining University. As a result of the experimental studies, new compositions of well killing and stimulation fluids were developed, which ensure to prevent fluid loss, gas breakthrough, as well as the preservation, restoration and improvement of the filtration characteristics of the BFZ in the conditions of terrigenous and carbonate reservoirs at different stages of oil field development. It is determined that the developed process fluids, which include surfactants (YALAN-E2 and NG-1), have a hydrophobic effect on the porous medium of reservoir rocks, which ultimately contributes to the preservation, restoration and improvement of the filtration characteristics of the BFZ. The value of the presented research results is relevant for practice and confirmed by the fact that, as a result of field tests of the technology for blocking the BFZ with the composition of inverse water–oil emulsion during well killing before workover operation, an improvement in the efficiency of wells operation was obtained in the form of an increase in their oil production rate by an average of 5–10 m3/day, reducing the time required for the well to start operating up to 1–3 days and reducing the water cut of formation fluid by 20–30%.

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Experience of Gas Wells Development in Complex Carbonate Reservoirs in Different Stages of Development

Abstract: Summary This paper describes practical experience of perforating of producing horizons under conditions that are incompatible for perforating for geological reasons, as well as methods of killing and developing wells with ALRP.

Cited by 3 publications

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Specifics of Well Killing Technology During Well Service Operation in Complicated Conditions

Specifics of Well Killing Technology During Well Service Operation in Complicated Conditions

Development of technological solutions for reliable killing of wells by temporarily blocking a productive formation under ALRP conditions (on the example of the Cenomanian gas deposits)

Well Killing Technology before Workover Operation in Complicated Conditions

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