On the selection of suitable operate durations for injection tests in low permeability reservoirs

2020 ◽  
Vol 6 (1) ◽  
pp. 135-149
Author(s):  
Guzyal F. Asalkhuzina ◽  
Alfred Ya. Davletbaev ◽  
Ildus L. Khabibullin ◽  
Rina R. Akhmetova
Keyword(s):  
Steady State ◽  
Numerical Model ◽  
Low Permeability ◽  
Reservoir Pressure ◽  
Well Test ◽  
Injection Wells ◽  
Fluid Filtration ◽  
Operating Modes ◽  
Low Permeability Reservoirs ◽  
Injection Modes

The article discusses the aspects of conducting and analyzing the results of hydrodynamic studies of wells (well test) at steady-state injection modes conducted in injection wells in order to assess reservoir pressure and injectivity. The main goal of this work is to determine the necessary duration of injection modes at which reservoir pressure will be determined at the maximum research radius. In view of the considerable duration of the study, in low-permeability reservoirs, the work of the environment wells is taken into account, which, in the process of well research, should have a minimal impact on the results of data interpretation. To this end, we simulated the dynamics of pressure changes for this type of well test for various parameters of the reservoir and the duration of injection modes, taking into account the influence of the work of the surrounding production wells. To solve this problem, we used a numerical model of fluid filtration in an element of a nine-point development system in a low-permeable reservoir. The production and injection of fluid is carried out in wells with main technogenic fractures of hydraulic fracturing. During the simulation, the filtration parameters of the “fracture-formation” system and the duration of the well operating modes were varied, and synthetic data on the change in pressure in the wells were reproduced. Pressure and flow rates at the well operating modes were analyzed by plotting the indicator diagram (ID). Estimates of the extrapolated pressure from the ID graphs were compared with the pressures in the numerical model, in particular, the pressure on the supply circuit and on the study radius. It is shown that for low-permeability formations when studying injection wells using the steady-state injection method, it is necessary to take into account the research radius, which depends on the permeability of the formation and the duration of the injection regimes. Also, the research radius must be taken into account when constructing isobar maps along with the reservoir pressure value.

Study on Test Cycle of Build-up Well Test in Low Permeability Reservoir

2012 ◽  
Vol 594-597 ◽  
pp. 456-459
Author(s):  
Tong Jing Liu ◽  
Bao Yi Jiang ◽  
Rui Liu ◽  
Peng Xiang Diwu
Keyword(s):  
Reservoir Engineering ◽  
Low Permeability ◽  
Actual Process ◽  
Test Interpretation ◽  
Well Test ◽  
Test Cycle ◽  
Main Research ◽  
Low Permeability Reservoir ◽  
Production Wells ◽  
Low Permeability Reservoirs

The speed of development of well test technology has been faster than well test interpretation technology in low permeability reservoirs. One of the main research directions for well test soft technology was specific interpretation theory and interpretation techniques. In recent years, well test was put forward higher request by the production complex and low permeability reservoirs. Test interpretation results urgently need to be applied to reservoir engineering analysis in-depth and quantitatively. One of the limited reality conditions of well test application was lack of the comprehensive research combined with the reservoir engineering. Combining with the test examples, the investigation radius change between injection-production wells was studied, and the build-up well test cycle in low permeability reservoir was optimized. According to the actual process situation, it was proposed that take 20d as the upper limit of well test cycle, and 10d block as the lower limit of well test cycle of build-up well test in a typical low permeability reservoir.

A Novel Method of Non-Darcy Well Test Interpretation for Ultra-Low Permeability Reservoirs

2020 ◽  
Author(s):  
Li Li ◽  
Wei Liang ◽  
Zhenghe Yan ◽  
Kun Wang ◽  
Qiyuan Luo ◽  
...  
Keyword(s):  
Low Permeability ◽  
Test Interpretation ◽  
Well Test ◽  
Novel Method ◽  
Low Permeability Reservoirs

Application of Pressure-Rate Deconvolution to Well Test Interpretation of Low Permeability Reservoirs

2011 ◽  
Vol 383-390 ◽  
pp. 243-247
Author(s):  
Ying Hao Shen ◽  
Shun Li He ◽  
Hong Ling Zhang
Keyword(s):  
Solution Algorithm ◽  
Test Sequence ◽  
Low Permeability ◽  
Test Interpretation ◽  
Well Test ◽  
Deconvolution Method ◽  
Robust Solution ◽  
Deconvolution Algorithm ◽  
Low Permeability Reservoirs

Pressure-rate deconvolution method based on the newly robust solution algorithm is applied to low permeability reservoirs, and deconvolution codes were developed for the study based on Schreoter deconvolution algorithm in this paper. The application of this method in a low permeability oilfield shows that deconvolution can provide much more information than the conventional well test interpretation methods, and this deconvolution method can interpret the whole test sequence but doesn’t be limited in pressure build-up period. It is proved that the pressure-rate deconvolution algorithm works well in well test interpretation of low permeability reservoirs.

scholarly journals Rationale for the technological gas-condensate well operation conditions under the conditions low-permeability reservoir

2019 ◽  
pp. 68-72
Author(s):  
Vladislav V. Inyakin ◽  
Semen F. Mulyavin ◽  
Igor A. Usachev
Keyword(s):  
Steady State ◽  
Gas Dynamics ◽  
Oil And Gas ◽  
Gas Condensate ◽  
Low Permeability ◽  
Operation Conditions ◽  
Dynamic Condensation ◽  
Set Up ◽  
Low Permeability Reservoirs ◽  
Potential Content

The development of oil and gas condensate fields is accompanied by phase transformations of reservoir mixtures, i.e. the transition of condensate from the gas state at the formation pressure below the condensation start pressure and its reverse evaporation when the maximum condensation pressure passes. Dynamic condensation leads to a decrease in permeability in the bottomhole zone, as a result, the productivity of the well is reduced.We have used the method of gas-dynamics research at steady-state filtration conditions in our work in order to minimize the influence of retrograde processes and the justification of the technological well operation conditions of usage gasdynamics research at steady-state filtration conditions.Especially, set up a problem is important in conditions of low-permeability reservoirs with a significant potential content of condensate in the formation gas.

scholarly journals WATERFLOOD-INDUCED FRACTURE ON THE INJECTION WELLS IN LOW-PERMEABILITY RESERVOIR OF ACHIMOV SEQUENCE

2018 ◽  
pp. 39-43
Author(s):  
A. V. Klimov-Kayanidi ◽  
R. T. Alimkhanov ◽  
E. S. Agureeva ◽  
R. M. Sabitov
Keyword(s):  
Hydraulic Fracturing ◽  
Low Permeability ◽  
Reservoir Pressure ◽  
Reservoir Properties ◽  
Injection Wells ◽  
Field Development ◽  
Low Permeability Reservoir ◽  
Fracture Formation ◽  
Maintenance Systems

Achimov sequence is characterized by high heterogeneity and low reservoir properties, that makes it impossible economically profitable field development without hydraulic fracturing and usage reservoir pressure maintenance systems. The research aims to develop recommendations for regulating the operations of injection wells, in conditions of waterflood-induced fracture formation. The recommendations can be used to further regulate the waterflooding system for the conditions of Achimov sequence.

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