Using Well Interference CRM-Models to Estimate Filtration-Capacitive Properties of the Layer According to Development Data

Background. Predicting the dynamics of the Bazhenov formation is an important task. Traditionally, it is carried out using geological and hydrodynamic modeling, i. e., solving the direct problem of hydrodynamics. However, for shale reservoirs, this approach is not possible, oil production is a derivative of geology to a lesser extent than technology. Industrial net production rates can be obtained from non-reservoirs in the usual sense. The system of technogenic fractures forms a reservoir associated with oil-saturated rock and the properties of such a system are described by too many parameters with high uncertainty and a number of assumptions [3–7]. On the other hand, there are forecasting methods based on solving the inverse problem of hydrodynamics. Having a sufficient amount of development data, it is possible to predict the dynamics of work based on statistical dependencies [9] or proxy material balance models. The purpose of this work. The purpose of this work was to create a convenient methodology for calculating oil production from the reservoirs of the Bazhenov formation. Methodology. The paper proposes and tests a method for predicting the dynamics of oil, liquid and gas production for wells in the Bazhenov formation based on a modification of the CRM dynamic material balance model (Capacity-Resistive Models — volume-resistive model). Results. The method was tested when calculating the technological indicators of development for the object of one of the fields located in the KhMAO and showed its efficiency, which allows us to recommend it as a basis for drawing up project documents as an alternative to building a hydrodynamic model (GDM).

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A Physics-Based Method To Forecast Production From Tight and Shale Petroleum Reservoirs by Use of Succession of Pseudosteady States

SPE Reservoir Evaluation & Engineering ◽

10.2118/167686-pa ◽

2015 ◽

Vol 18 (04) ◽

pp. 508-522 ◽

Cited By ~ 7

Author(s):

M. S. Shahamat ◽

L.. Mattar ◽

R.. Aguilera

Keyword(s):

Balance Equation ◽

Transient Flow ◽

Material Balance ◽

Petroleum Reservoirs ◽

Flow Equation ◽

Production Data ◽

Material Balance Equation ◽

Gas Reservoirs ◽

Initial Flow ◽

Shale Reservoirs

Summary Analysis of production data from tight and shale reservoirs requires the use of complex models for which the inputs are rarely known. The same objectives can also be achieved by knowing only the overall (bulk) characteristics of the reservoir, with no need for all the detailed and rarely known inputs. In this study, we introduce the concept of continuous succession of pseudosteady states as a method to perform the analysis of production data. It requires few input data yet is based on rigorous engineering concepts, which works during the transient- as well as the boundary-dominated-flow periods. This method consists of a combination of three simple and well-known equations: material balance, distance of investigation, and boundary-dominated flow. It is a form of a capacitance/resistance methodology in which the material-balance equation over the investigated region represents the capacitance and the boundary-dominated-flow equation represents the resistance. The flow regime in the region of investigation (the areal extent of which varies with time during transient flow) is assumed to be pseudosteady state. This region is depleted at a rate controlled by the material-balance equation. The initial flow rate and flowing pressure are used to define the resistance, and the distance of investigation defines the capacitance. The capacitance and resistance are then used in a stepwise procedure to calculate the depletion and the new rates or flowing pressures. The method was tested, for linear-flow geometry, against analytical solutions for liquids and numerical simulations for gas reservoirs, exhibiting both transient and boundary-dominated flow. Excellent agreement was obtained, thus corroborating the validity of the method developed in this study. Two practical examples are provided to demonstrate the applicability of the methodology to forecast production from tight and shale petroleum reservoirs. The proposed method is easy to implement in a spreadsheet application. It indicates that complex systems with complicated mathematical (e.g., Laplace space) solutions can be represented adequately by use of simple concepts. The approach offers a new insight into production analysis of tight and shale reservoirs, by use of familiar and easy-to-understand reservoir-engineering principles.

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Hydrology of swelling soils: a review

Soil Research ◽

10.1071/sr99098 ◽

2000 ◽

Vol 38 (3) ◽

pp. 501 ◽

Cited By ~ 35

Author(s):

D. E. Smiles

Keyword(s):

Water Flow ◽

Liquid Flow ◽

Soil Mechanics ◽

Material Balance ◽

Flow Equation ◽

Richards Equation ◽

Gravitational Potential Energy ◽

Future Research ◽

Swelling Soils ◽

Wide Range

A generally accepted theory of liquid flow in rigid systems has been used in soil science for more than 50 years. Liquid flow in systems that change volume with liquid content is not so well described and remains a major challenge to soil scientists, although its application in chemical and mining engineering and soil mechanics is increasingly accepted. Theory of water flow in swelling soils must satisfy material continuity. It must also account for changes in the gravitational potential energy of the system during swelling and for anisotropic stresses that constrain the soil laterally but permit vertical movement. A macroscopic and phenomenological analysis based on material balance and Darcy’s law is the most useful first approach to water flow and volume change in such soils. Use of a material coordinate based on the solid distribution results in a flow equation analogous to that L. A. Richards enunciated for non-swelling soils. This framework is strain-independent and solutions to the flow equation exist for a wide range of practically important conditions. The approach has been well tested in clay suspensions and saturated systems such as mine tailings and sediments. It is also applied in soil mechanics. This paper reviews central elements in application of the analysis to swelling soils. It argues that, as with use of the Richards’ equation in rigid soils, complexities are evident, but the approach remains the most coherent and profitable to support current need and future research. The use of material coordinates, to ensure material balance is assessed correctly, is simple.

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Corrigendum to: Hydrology of swelling soils: a review

Soil Research ◽

10.1071/sr99098_co ◽

2001 ◽

Vol 39 (6) ◽

pp. 1467

Author(s):

D. E. Smiles

Keyword(s):

Water Flow ◽

Liquid Flow ◽

Soil Mechanics ◽

Material Balance ◽

Flow Equation ◽

Richards Equation ◽

Gravitational Potential Energy ◽

Future Research ◽

Swelling Soils ◽

Wide Range

A generally accepted theory of liquid flow in rigid systems has been used in soil science for more than 50 years. Liquid flow in systems that change volume with liquid content is not so well described and remains a major challenge to soil scientists, although its application in chemical and mining engineering and soil mechanics is increasingly accepted. Theory of water flow in swelling soils must satisfy material continuity. It must also account for changes in the gravitational potential energy of the system during swelling and for anisotropic stresses that constrain the soil laterally but permit vertical movement. A macroscopic and phenomenological analysis based on material balance and Darcy’s law is the most useful first approach to water flow and volume change in such soils. Use of a material coordinate based on the solid distribution results in a flow equation analogous to that L. A. Richards enunciated for non-swelling soils. This framework is strain-independent and solutions to the flow equation exist for a wide range of practically important conditions. The approach has been well tested in clay suspensions and saturated systems such as mine tailings and sediments. It is also applied in soil mechanics. This paper reviews central elements in application of the analysis to swelling soils. It argues that, as with use of the Richards’ equation in rigid soils, complexities are evident, but the approach remains the most coherent and profitable to support current need and future research. The use of material coordinates, to ensure material balance is assessed correctly, is simple.

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