Analysis of Efficiency of Horizontal Drilling in Low-Permeability Reservoirs at the Fields of LLC Lukoil-Western Siberia with Oil-Based Drilling Fluids

Abstract The article presents a new method of determining the residual water saturation of the Bazhenov Rock Formation using synchronous thermal analysis which is combined with gas IR and MS spectroscopy. The efficiency of the extraction-distillation method of determining open porous and residual saturation in comparison with the developed method which are considered in detail. Based on the results of studies in the properties of the Bazhenov Rock Formation, a significant underestimation of the residual water saturation in the existing guidelines for calculating reserves was found, and the structure of the saturation of rocks occurred to be typical for traditional low-permeability reservoirs. The values of open porous and residual water saturation along the section of the Bazhenov Formation vary greatly, which also contradicts the well-established opinion about the weak variability of the rock properties with depth.

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Research on Low Damage Drilling Fluids and Application in Low Permeability Reservoirs of Shengli Oilfield

Proceedings of the International Field Exploration and Development Conference 2018 - Springer Series in Geomechanics and Geoengineering ◽

10.1007/978-981-13-7127-1_2 ◽

2019 ◽

pp. 11-23

Author(s):

J. Y. Liu ◽

E. D. Chen ◽

X. L. Li

Keyword(s):

Low Permeability ◽

Drilling Fluids ◽

Shengli Oilfield ◽

Low Permeability Reservoirs

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Numerical simulation of formation damage by drilling fluid in low permeability sandstone reservoirs

Journal of Petroleum Exploration and Production Technology ◽

10.1007/s13202-021-01137-x ◽

2021 ◽

Vol 11 (4) ◽

pp. 1865-1871

Author(s):

Weiwei He ◽

Zhiqiang Liu

Keyword(s):

Numerical Simulation ◽

Drilling Fluid ◽

Empirical Relationship ◽

High Viscosity ◽

Formation Damage ◽

Low Permeability ◽

Drilling Fluids ◽

Drilling Operation ◽

Fracture Damage ◽

Low Permeability Reservoirs

AbstractUnderstanding the formation damage surrounding the well during the drilling operation is the key to predict damage degree and protect the formation in oil/gas reserviors. Based on the core drainage results, we obtained an empirical relationship between the invasion volume of drilling fluid and permeability reduction of formation. Furthermore, the equation is incorporated into a commercial reservior numerical simulation simulator to characterize the behaviors of drilling fluid invasion process. The results show that, although the invasion depth in low permeability reservoirs is short with the range of 1.7–2.5 m, the effect on recovery factor is significant due to the narrow seepage area in the near fracture region. When considering the formation damage, the pressure in the near-fracture damage region drops sharply, leading to a three-stage shape in pressure distribution curve. In addition, we found that high viscosity and low density oil-based slurry and shorter soaking period are conducive to decrease the formation damage during drilling operation. This work reveals the fundamental mechanisms of formation damage in low permeability reservoirs, which is a theoretical basis in formulation drilling fluids and optimization operation parameters.

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ASSESSMENT OF THE CONDITION OF THE NEAR-WELLBORE ZONE OF REPAIRED WELLS BY THE SKIN FACTOR

10.31219/osf.io/7sjtb ◽

2021 ◽

Author(s):

Sudad H AL-Obaidi ◽

Chang WJ ◽

Patkin AA

Keyword(s):

Western Siberia ◽

Oil And Gas ◽

Skin Effect ◽

Objective Assessment ◽

Oil Production ◽

Low Permeability ◽

Formation Zone ◽

Production Wells ◽

Exploration And Production ◽

Low Permeability Reservoirs

Production wells that have penetrated low-permeability reservoirs do not provide adequate oil production due to the degraded condition of the near-wellbore zones of the reservoir. Objective assessment of the condition of the near-wellbore formation zone of exploration and production wells by determining the magnitudes and values of skin effects using well tests allows timely implementation of measures to increase the productivity of wells and oil production.In this article, the following aspects of difficult-to-recover oil production were examined:- The analysis of the dependence of well productivity on the magnitude and significance of the skin effect, in order to assess the condition of the bottomhole formation zone for further planning and implementation of oil and gas inflow stimulation measures;- The influence of the magnitude and significance of the skin effect on the condition of the bottomhole formation zone on the experience of developing exploration wells penetrated into low-permeability formations in the fields of Western Siberia;- Criteria (based on the value and magnitude of the skin effect) for selecting methods of stimulating the bottomhole formation zone to increase the productivity of low-rate wells.

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SHALE AS HYDROCARBON RESERVOIRS

Scientific Contributions Oil and Gas ◽

10.29017/scog.39.2.104 ◽

2018 ◽

Vol 39 (2) ◽

pp. 71-75

Author(s):

Adi Junira ◽

Andy Setyo Wibowo

Keyword(s):

Hydraulic Fracturing ◽

Liquid Flow ◽

Oil Shale ◽

Hydrocarbon Exploration ◽

Low Permeability ◽

Horizontal Drilling ◽

Main Obstacle ◽

The Past ◽

Shale Reservoir ◽

Low Permeability Reservoirs

Nowadays, shale plays a role as hydrocarbon producing rock. Due to its unusual properties as a reservoir, shale is classified as an unconventional reservoir. Among these properties are the relatively low permeability (0.1 mD or less) and the relatively low porosity (10% or less). The relatively low permeability had been the main obstacle to extracting the hydrocarbon held by shale in the past. Nevertheless, the technologies of horizontal drilling and hydraulic fracturing have proven to be effective in stimulating a liquid flow in low permeability reservoirs such as a shale layer which has encouraged the hydrocarbon exploration in the oil shale industry. This paper is intended to provide an overview of technologies implemented in the current oil shale reservoir along with their challenges summarized from available sources in a concise manner.

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ASSESSMENT OF OIL WELL PRODUCTIVITY IN LOW-PERMEABILITY RESERVOIRS IN THE FIELDS OF EASTERN SIBERIA

Oil and Gas Studies ◽

10.31660/0445-0108-2017-3-30-36 ◽

2017 ◽

pp. 30-36

Author(s):

R. V. Urvantsev ◽

S. E. Cheban

Keyword(s):

Oil Recovery ◽

Large Scale ◽

Oil And Gas ◽

Oil Extraction ◽

Low Permeability ◽

Oil Well ◽

Eastern Siberia ◽

Development Costs ◽

Traditional Fields ◽

Low Permeability Reservoirs

The 21st century witnessed the development of the oil extraction industry in Russia due to the intensifica- tion of its production at the existing traditional fields of Western Siberia, the Volga region and other oil-extracting regions, and due discovering new oil and gas provinces. At that time the path to the development of fields in Eastern Siberia was already paved. The large-scale discoveries of a number of fields made here in the 70s-80s of the 20th century are only being developed now. The process of development itself is rather slow in view of a number of reasons. Create a problem of high cost value of oil extraction in the region. One of the major tasks is obtaining the maximum oil recovery factor while reducing the development costs. The carbonate layer lying within the Katangsky suite is low-permeability, and its inventories are categorised as hard to recover. Now, the object is at a stage of trial development,which foregrounds researches on selecting the effective methods of oil extraction.

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