Development of viscoelastic systems and technologies for isolating  water-bearing horizons with abnormal formation pressures during  oil and gas wells drilling

Dvoynikov, Mikhail; Kuchin, Vyacheslav; Mintzaev, Magomed Sh.

doi:10.31897/pmi.2021.1.7

Cited by 17 publications

(17 citation statements)

References 20 publications

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“…However, it should be considered that till the present day, there is no rheological model that would give the required accuracy of approximation over the whole interval of shear rate changes corresponding to drilling fluid circulation in the well [36][37][38].…”

Section: Rheological Models Of Modern Drilling Fluidsmentioning

confidence: 99%

Investigation of Non-Linear Rheological Characteristics of Barite-Free Drilling Fluids

Leusheva

Brovkina

Morenov

2021

Fluids

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Drilling fluids play an important role in the construction of oil and gas wells. Furthermore, drilling of oil and gas wells at offshore fields is an even more complex task that requires application of specialized drilling muds, which are non-Newtonian and complex fluids. With regard to fluid properties, it is necessary to manage the equivalent circulation density because its high values can lead to fracture in the formation, loss of circulation and wellbore instability. Thus, rheology of the used drilling mud has a significant impact on the equivalent circulation density. The aim of the present research is to develop compositions of drilling muds with a low solids load based on salts of formate acid and improve their rheological parameters for wells with a narrow drilling fluid density range. Partially hydrolyzed polyacrylamide of different molecular weights was proposed as a replacement for hydrolized polyacrylamide. The experiment was conducted on a Fann rotary viscometer. The article presents experimentally obtained data of indicators such as plastic viscosity, yield point, nonlinearity index and consistency coefficient. Experimental data were analyzed by the method of approximation. Analysis is performed in order to determine the most suitable rheological model, which describes the investigated fluids’ flow with the least error.

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Section: Rheological Models Of Modern Drilling Fluidsmentioning

confidence: 99%

Investigation of Non-Linear Rheological Characteristics of Barite-Free Drilling Fluids

Leusheva

Brovkina

Morenov

2021

Fluids

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“…Currently, more than half of the stock of production wells in Russia needs the use of water shut-off technology (WSOT) [2,4,10,11,17,21,23]. The main prerequisites for conducting WSOT are the transfer of fields to the final stage of development, and, accordingly, an increase in the water cut of the produced products [18].…”

Section: Introductionmentioning

confidence: 99%

Improvement of operational efficiency of high water-cut oil wells

Raupov

Milic

2022

IOP Conf. Ser.: Earth Environ. Sci.

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This paper describes a new algorithm for selecting candidate wells for water shut-off works. A new comprehensive methodology for the selection of candidate wells for water shut-off technology is proposed, consisting of 4 stages, where wells with excessive water cut are identified. The reasons for the water cut are determined, and the effectiveness of water shut-off technology on a potential candidate well is substantiated and predicted. The proposed method has been tested by the example of two wells in terrigenous reservoirs of a gas-oil field.

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“…A drilling-fluid system is a component of the well construction process that remains in contact with the wellbore throughout the drilling operation. The design of the drilling-fluid system involves the development of its formulation and is carried out so as to perform effectively under the expected conditions in the wellbore [20]. The main functions of drilling fluids and their corresponding properties are shown in Table 1.…”

Section: Introduction 1relevance Of the Workmentioning

confidence: 99%

Development of a Weighted Barite-Free Formate Drilling Mud for Well Construction under Complicated Conditions

2021

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Construction of oil and gas wells at offshore fields often involves high formation pressure and the presence of swellable clay rocks in the section. In addition, productivity preservation is also an important aspect. For this purpose, it is necessary to reduce the solids content of the drilling mud. The purpose of this work is to develop, improve, and study compositions of weighted drilling muds with low content of solids, on the basis of organic salts of alkali metals and polymers for the construction of wells prone to rock swelling and/or cavings, as well as drilling fluids for drilling-in the formation. In order to achieve the set goal the following is required: Analysis of existing drilling muds of higher density for drilling wells in unstable rock intervals and for drilling in the productive formation; analysis of experience in using drilling systems on the formic acid salts base and substantiation of requirements for flushing fluids during well construction; development and investigation of drilling mud compositions on the formate base; and the evaluation of inhibiting effect of systems containing organic salts, polymer reagents, and calcium carbonate on clay samples. The developed drilling mud is characterized by a high inhibiting ability that allows minimized mud-weighting by the natural solid phase. This reduces the volume of prepared mud and facilitates the regulation of its properties by reducing the dispersion of drilled cuttings; it eliminates problems related to hydration and the swelling of active clay rocks; and stabilizes unstable argillites prone to caving. The low solids content, low filtration rates, and inhibitory nature of the mud allows high stability of the rheological properties of the mud, and preserves oil and gas reservoir productivity under conditions of elevated formation pressure.

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Development of viscoelastic systems and technologies for isolating water-bearing horizons with abnormal formation pressures during oil and gas wells drilling

Cited by 17 publications

References 20 publications

Investigation of Non-Linear Rheological Characteristics of Barite-Free Drilling Fluids

Investigation of Non-Linear Rheological Characteristics of Barite-Free Drilling Fluids

Improvement of operational efficiency of high water-cut oil wells

Development of a Weighted Barite-Free Formate Drilling Mud for Well Construction under Complicated Conditions

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