Investigating of compositions for lost circulation control

Nutskova, M. V.; Rudiaeva, E.Y.; Kuchin, V.N.; Yakovlev, A.A.

doi:10.1201/9780429327070-55

Cited by 6 publications

(9 citation statements)

References 1 publication

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“…Research [24] confirms the compatibility of formates with a range of formation materials after a series of laboratory formation damage tests carried out under simulated formation conditions with real rock samples. Unlike polymer and KCl/glycol systems, potassium formate brine has a density of 1.57 g/cm 3 without the addition of weighting agents, such as barite or ilmenite, while KCl-based brine will not exceed 1.15 g/cm 3 , meaning that weighting material must be added to achieve the desired density. Once such a solution penetrates the productive horizon, solids in large quantities will damage the formation, whereas the potassium formate brine is a minimally damaging system, free of solids.…”

Section: Application Of Formate Drilling Mudsmentioning

confidence: 99%

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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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Section: Application Of Formate Drilling Mudsmentioning

confidence: 99%

“…Consequently, when selecting drilling fluids for drilling in caving zones, the density and water loss of the flushing fluid are not the determining factors. Under these conditions, the choice should be made in favor of the most inert drilling system in contact with unstable formations [3,4].…”

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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“…Because a riser string is used in deep water drilling, the hydrostatic pressure of the mud column can reach or exceed the fracture gradient, especially when circulation is resumed after a static period, tripping in the borehole or running the casing string. In this case, catastrophic losses of the solution can occur, which can lead to problems of pressure control in the well [6,27,28]. ECD control is critical for maintaining borehole stability.…”

Section: Calculation Of Equivalent Circulation Densitymentioning

confidence: 99%

Dependence of the Equivalent Circulation Density of Formate Drilling Fluids on the Molecular Mass of the Polymer Reagent

2021

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Construction of offshore gas wells is characterized by increased requirements for both the technological process in general and the technological parameters of drilling fluids in particular. Parameters and properties of the used drilling muds must meet a large number of requirements. The main one is the preservation of the permeability of the reservoirs, in addition to the environmental and technological concerns. At the same time, pressures in the productive formation at offshore fields are often high; the anomaly coefficient is 1.2 and higher. The use of barite in such conditions can lead to contamination of the formation and a decrease in future well flow rates. In this regard, the development and study of the compositions for weighted drilling muds is necessary and relevant. The paper presents investigations on the development of such a composition based on salts of formic acid (formates) and evaluates the effect of the molecular weight of the polymer reagent (partially hydrolyzed polyacrylamide) on the equivalent circulation density of the drilling fluid. The result of the work is a formate-based high-density drilling mud with no barite added. Application of such a mud will preserve the permeability of the productive formation.

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“…In addition, the constantly rising demand for more complete and efficient exploitation of productive rocks. In this regard, the drilling fluid must have a composition and properties which would provide an opportunity to deal with most of the possible complications and not have a negative impact on reservoir properties of productive horizons [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Research of the inhibitory capacity of the polymer salt drilling fluids based on xanthan gum

Verisokin

2019

Egypt. J. Chem.

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I N the drilling process, the balance of the rocks composing the walls of the wells is disturbed. The stability of the walls depends on the original strength characteristics of rocks and their changes under the influence of various factors. Therefore, drilling mud plays large role. It is known that the main role in the intensification of the process of softening clays is determined by original humidity, and the saturation of drilling mud filtrate under the action of the formation overburden. The absorption of the filtrate of drilling mud occurs not so much under the influence of pressure drop in the system well-reservoir, as a result of physical and chemical effects, growing in most clay rock. The most optimal from the point of view of stability of the borehole walls are cases where in the system the well-reservoir osmotic equilibrium is established, or osmosis is directed from the reservoir into the well.The greatest influence of the osmotic pressure exhibited when saline drilling fluids are used. This paper examines the effect of polymer salt of drilling fluids clay swelling, i.e. inhibiting the ability of drilling mud.

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Investigating of compositions for lost circulation control

Cited by 6 publications

References 1 publication

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

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

Dependence of the Equivalent Circulation Density of Formate Drilling Fluids on the Molecular Mass of the Polymer Reagent

Research of the inhibitory capacity of the polymer salt drilling fluids based on xanthan gum

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