Development of a polymer-based drilling mud to preserve reservoir properties in the bottom hole formation zone

2021 ◽

pp. 24-30

Author(s):

Mikhail Dorfman ◽

Keyword(s):

Low Permeability ◽

Drilling Mud ◽

High Permeability ◽

Hole Formation ◽

Reservoir Properties ◽

Bottom Hole ◽

Formation Zone ◽

Porosity And Permeability ◽

Equivalent Area ◽

Low Permeability Reservoirs

Introduction. The efficiency of matrix acidizing of the bottom-hole formation zone depends on many factors, the chief being the reservoir properties. The research aim is to assess the effect produced by the formation reservoir properties on the result of hydrochloric acid treatment. Experiments simulating carbonate formation acid treatment were carried out. Methods. The experiments were carried out using the UIK-1 core analysis apparatus. Carbonate cores with different porosity and permeability were selected. Some of the experiments modeled permeability reduction as a result of bottom-hole formation zone contamination with drilling mud. Results. The research has shown that during low permeability reservoirs acidizing, permeability increases to a greater extent than during high permeability cores acidizing. In low permeability cores, the acid solution mainly forms new channels, while in high permeability cores the expansion of existing ones mainly occurs. In the present paper, the equivalent surface area of the acid-formed channels was estimated. When acidizing low permeability cores, the equivalent area of the channels is larger than when acidizing high permeability cores. The outcome of acidizing of the core samples with impaired porosity and permeability and contaminated with model drilling mud is comparable to acidizing of low permeability samples not contaminated with drilling mud. Conclusions. Acidizing of low permeability reservoirs leads to a greater increase in permeability. The equivalent area of acid-formed channels is larger than that of high permeability cores treatment. This reveals that the impact of acid on low permeability reservoirs is more effective.

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DEVELOPMENT OF AN ASPHALT-RESIN-PARAFFIN DEPOSITS INHIBITOR AND SUBSTANTIATION OF THE TECHNOLOGICAL PARAMETERS OF ITS INJECTION INTO THE BOTTOM-HOLE FORMATION ZONE

Periódico Tchê Química ◽

10.52571/ptq.v17.n34.2020.793_p34_pgs_769_781.pdf ◽

2020 ◽

Vol 17 (34) ◽

pp. 769-781 ◽

Cited By ~ 2

Author(s):

Karina Shamilevna KHAIBULLINA ◽

Grigory Yurievich KOROBOV ◽

Aleksandr Viktorovich LEKOMTSEV

Keyword(s):

Core Material ◽

Hole Formation ◽

Technological Parameters ◽

Oil Saturation ◽

Bottom Hole ◽

Formation Zone ◽

Production Wells ◽

Bulk Model ◽

Corrosive Activity ◽

The Impact

The problem of the formation of asphalt-resin-paraffin deposits (ARPD) in oil fields within the “well – bottom-hole formation zone” system is still relevant. To prevent the formation of ARPD in the “bottom-hole formation zone – well” system, the ARPD inhibitors must have high adsorption and low desorption properties concerning the rock. The composition of inhibitors often includes surfactants. Nonionic surfactants, namely, polyesters, are widely used to prevent the formation of ARPD. However, currently, little is known about inhibitors with a combined effect, for example, possessing depressor-dispersing properties for ARPD. This work aimed to develop a combined inhibitor possessing not only depressor-dispersing properties but also having good adsorption and desorption properties to the rock to prevent the formation of ARPD. The paper presents the research results on the development of an ARPD inhibitor, as well as the effects of determination of its depressor dispersing, inhibiting, and corrosive properties; the temperature of oil saturation with paraffin is determined as well. The studies of the ARPD inhibitor adsorption were carried out by the static and dynamic methods. In contrast, the process of the inhibitor desorption was studied by oil filtering through a saturated sample of the rock using a bulk model and core material. The impact of the fluid flow rate on the inhibitor desorption rate was studied. The technological parameters of the ARPD inhibitor solution injection into the bottom-hole formation zone of production wells were calculated. The developed composition has high inhibiting properties concerning the ARPD, depressor dispersing properties, low corrosive activity for a metal surface, and is capable of lowering the temperature of oil saturation with paraffin.

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Geophysical Methods for Bottom-Hole Formation Zone Treatment for Improved Oil Recovery in the Fields of The Republic Of Tatarastan - Case History

10.3997/2214-4609-pdb.7.p045 ◽

2003 ◽

Author(s):

Ya.K. Nuretdinov ◽

A.G. Korzhenevsky ◽

R.R. Badurtdinov ◽

R.I. Yusupov

Keyword(s):

Oil Recovery ◽

Case History ◽

Geophysical Methods ◽

Hole Formation ◽

Improved Oil Recovery ◽

Bottom Hole ◽

Formation Zone ◽

The Republic

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Development of a Vibrowave Generator for Vibroimpact on Bottom-Hole Formation Zone

Chemical and Petroleum Engineering ◽

10.1007/s10556-016-0168-7 ◽

2016 ◽

Vol 52 (3-4) ◽

pp. 164-166

Author(s):

T. D. Karmanov ◽

B. Z. Kaliev ◽

I. B. Chelpanov ◽

A. V. Kochetkov

Keyword(s):

Hole Formation ◽

Bottom Hole ◽

Formation Zone

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A Study of Compositions Relevant to Selective Water Isolation in Gas Wells

10.31224/osf.io/vxdbj ◽

2021 ◽

Author(s):

Sudad H Al-Obaidi ◽

Hofmann M ◽

Smirnov VI ◽

Khalaf FH ◽

Hiba H Alwan

Keyword(s):

Porous Media ◽

High Selectivity ◽

High Water ◽

Saturated Porous Media ◽

Hole Formation ◽

Gas Wells ◽

Bottom Hole ◽

Formation Zone ◽

Saturated Media ◽

Water Saturated

A hydrophobic composition containing water repellents and highly volatile solvents is shown in this study to isolate water from the bottom hole formation zone of gas wells and reduce as much as possible the saturation of pore spaces with water. During injection, this composition shows selectivity and mostly penetrates water-saturated porous media. The study shows that the injection of such composition into porous media has a high water-insulating effect, reducing the water permeability of water-saturated porous media by 35 times with a degree of water isolation of 97%.Moreover, while injecting, it has selective action, mainly penetrating water-saturated media rather than gas saturated media. As a result of injecting 0.91 to 0.99 pore volumes (pv) of the composition, the Qwater/Qgas ratio reaches 5.22 to 5.26, indicating high selectivity.

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SUBSTANTIATION AND SELECTION OF AN INHIBITOR FOR PREVENTING THE FORMATION OF ASPHALT-RESIN-PARAFFIN DEPOSITS

Periódico Tchê Química ◽

10.52571/ptq.v17.n34.2020.565_p34_pgs_541_551.pdf ◽

2020 ◽

Vol 17 (34) ◽

pp. 541-551 ◽

Cited By ~ 3

Author(s):

Karina Shamilevna KHAIBULLINA ◽

Lyaisan Rustamovna SAGIROVA ◽

Mikhail Sergeevich SANDYGA

Keyword(s):

Freezing Point ◽

Visual Observation ◽

Hole Formation ◽

Slowing Down ◽

Relevant Today ◽

Stage Of Development ◽

Bottom Hole ◽

Formation Zone ◽

Organic Deposits ◽

The Impact

Currently, most oil fields are under the late stage of development, which is associated with some challenges during the production of reservoir products, including the formation of asphalt-resin-paraffin deposits (ARPD) in the “well – bottom-hole formation zone” system. Even though the problem of organic deposits creation has existed for more than 60 years, it is still relevant today. Currently, to prevent the formation of ARPD, inhibitors divided into methods based on the use of wetting agents, modifiers, depressors, and dispersants are widely used infield practice. The composition of inhibitors often includes surfactants, and according to field experience, nonionic surfactants, namely, polyesters, are widely used to prevent the formation of ARPD. However, little is known about inhibitors with a combined effect, for example, possessing depressor-dispersing properties concerning ARPD. Proceeding from the above, the work is aimed to develop a combined inhibitor with depressor-dispersing properties to prevent the formation of ARPD. The dispersing property of the prepared reagent for asphaltene particles was determined using capillary and photocolorimetric methods. The studies were conducted to assess the impact of the reagent on the freezing point. A quantitative assessment of the sedimentation process using the “Cold rod” installation was performed, and the results of studies of the developed ARPD reagent-inhibitor corrosion resistance were presented. Two methods determined the temperature of oil saturation with paraffin: the direct approach – visual observation (Axio Lab A1 microscope) and the indirect approach – rheogoniometry to determine the kinematic viscosity of oil (HVM-472 viscosity analyzer (Walter Herzog GmbH, Germany)). Thus, an ARPD inhibitor (IN-1), comprising a copolymer of ethylene with α-olefins or polymers of acrylic, methacrylic, or cyanoacrylic acid esters, an emulsifier of inverted oil-in-water emulsions and a solvent, was developed. The developed inhibitor, having depressor-dispersing properties, is capable of reducing oil-freezing point in winter and of slowing down the precipitation of paraffin crystals in well equipped and in the bottom-hole formation zone (BHFZ).

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