Induced Fracture Modelling and Its Integration with Pressure Transient Analysis: Study for a Shallow-Water Offshore Field, South-East Asia – Part 2

Anand, Adi; Subrahmanyam, S. G.

doi:10.2118/172993-ms

Cited by 3 publications

(1 citation statement)

References 8 publications

(16 reference statements)

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“…In these calculations energy flow is represented by passive tracers and enthalpy-temperature relation is specified by specific heat capacities (Anand and Subrahmanyam 2014). This would reduce the impact of both above-mentioned temperature effects.…”

Section: Spe-179629-msmentioning

confidence: 99%

Low Salinity Flooding Trial at West Salym Field

Erke¹,

Volokitin²,

Edelman³

et al. 2016

All Days

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Low-salinity waterflooding (LSF) has been recognized as an IOR/EOR technique for both green and brown fields in which the salinity of the injected water is lowered for particular reservoir properties to improve oil recovery. While providing lower or similar UTC's low salinity projects have the advantage of lower capital and operational costs as compared to some more expensive EOR alternatives.This work describes LSF experiments, field-scale simulation results, and conceptual design of surface facilities for West Salym oil field. The field is located in West Siberia and is on stream since 2004. Conventional waterflooding was started in 2005 and current water cut is currently above 80% in the developed area of the field. To counter oil production decline a tertiary Alkaline-Surfactant-Polymer (ASP) flooding technique selected for mature waterflooded field parts and piloting of this technique is ongoing. Operationally simpler and more cost-effective LSF method is considered for implementation in the unflushed (green) areas of the field since it has been recognized that application of LSF in secondary mode results in better incremental oil recovery than LSF in tertiary mode.The results of a comprehensive conceptual study performed to justify the LSF trial are presented in this paper. To generate production forecast for LSF in the isolated area at the outset of reservoir development the results of laboratory core tests executed at different salinities presented earlier have been used. Dynamic reservoir modelling using low-salinity relative permeability curves showed that injection of low-salinity water leads to incremental oil production up to 2.5% of STOIIP. These results establish the fundamentals for a LSF field trial. A concept of surface facilities design for LSF trial area at West Salym oil field is also presented in the paper. Differently to other LSF projects it is proposed to prepare low-salinity water with required properties by mixing fresh water from aquifer and high salinity water from produced water reinjection (PWRI) system. In such a case LSF facilities concept does not require expensive water treatment techniques which significantly reduces the project capital and operational costs.

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Section: Spe-179629-msmentioning

confidence: 99%

Low Salinity Flooding Trial at West Salym Field

Erke¹,

Volokitin²,

Edelman³

et al. 2016

All Days

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show abstract

The physical process and pressure-transient analysis considering fractures excessive extension in water injection wells

Wang

Cheng

Feng

et al. 2017

Journal of Petroleum Science and Engineering

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Estimation of the Half-Length of Non-Simultaneous-Closed Fracture Through Pressure Transient Analysis: Model and Case Study

Wang

Ning

Jia

et al. 2022

Day 4 Thu, June 09, 2022

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During water-flooding development, severe water breakthrough has been observed in fractured wells. It is essential that determine the reason for water-breakthrough to improve the performance of production wells. However, the conventional pressure-transient analysis model hardly characterizes fracture-induced pressure response and fracture half-length, leading to erroneous results. This paper aimed at present an approach to estimate the half-length of non-simultaneous fracture induced in a relatively economical way. The non-simultaneous fracture closure flow (NFCF) model was proposed to characterize flow in induced fracture. To better characterize pressure response in induced fracture, we first modeled fluid flow in fracture with variable conductivity by two-part, variable-conductivity-linear flow and low-conductivity-linear flow. At the same time, fracture closure was considered to occur twice according to the pressure response of water injection wells, and its condiction followed experimental results. As a result, a semi-analytical solution was developed. We compared it with the finite-conductivity model to certify the accuracy. A new flow regime (the non-simultaneous fracture close linear flow) was discovered and behaved as two peaks on the pressure derivative curve. It will shorten the half-length of induced fracture if the new flow regime is ignored. Case studies showed that the NFCF model matched well with field data, which validated the practicability of the proposed approach. Our results might help accurately understand the reason for the water breakthrough - enormous the half-length of induced fracture was ignored in the past. In addition, the results also have provided significant insight for the operators could make reasonable decisions, reasonable well spacing and water-flooding rate, to improve production and water injection wells performance.

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Induced Fracture Modelling and Its Integration with Pressure Transient Analysis: Study for a Shallow-Water Offshore Field, South-East Asia – Part 2

Cited by 3 publications

References 8 publications

Low Salinity Flooding Trial at West Salym Field

Low Salinity Flooding Trial at West Salym Field

The physical process and pressure-transient analysis considering fractures excessive extension in water injection wells

Estimation of the Half-Length of Non-Simultaneous-Closed Fracture Through Pressure Transient Analysis: Model and Case Study

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