Quantitative characterization of interlayer interference and productivity prediction of directional wells in the multilayer commingled production of ordinary offshore heavy oil reservoirs

Huang, Shijun; Kang, Botao; Cheng, Linsong; Zhou, Wensheng; Chang, Shuping

doi:10.1016/s1876-3804(15)30046-x

Cited by 39 publications

(16 citation statements)

References 2 publications

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“…Based on the geological reservoir parameters of the S heavy oil reservoir in Bohai oilfield, a homogeneous geological model is established, and the comparison between the interlayer interference coefficient of the 5 wells in the S reservoir and the field test results is calculated [15], as shown in Table 1. It can be seen from Table 1 that the inter-layer interference coefficient obtained by considering the PSPG is consistent with the field test results as shown in Figure 2, which verifies the correctness of the model and the adopted method in this paper.…”

Section: Validation Of Model Prediction Resultsmentioning

confidence: 99%

“…In addition, in addition to the difference in physical property, the difference between the pressure and water content of the longitudinal layers is becoming more and more, and the interference is further aggravated. Huang Shijun et al [15] quantitatively characterized the interlayer interference in multilayer commingled production of ordinary offshore heavy oil reservoirs, and established an appropriate productivity prediction method of directional wells for multilayer commingled production of ordinary heavy oil reservoirs based on the physical experiment of visible multi-tube water flooding. They get an interesting conclusion that interlayer interference is mainly controlled by vertical reservoir permeability difference, and World Journal of Engineering and Technology proposed that it can be comprehensively characterized by reservoir reference permeability, permeability contrast and permeability deviation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Characterization and Dynamic Law of Interlayer Interference for Multilayer Commingled Production in Heavy Oil Reservoirs by Numerical Simulation

Dong¹,

Zhang²,

Zhu³

et al. 2019

WJET

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This paper moves one step forward to build a numerical model to research quantitative characterization and dynamic law for interlayer interference factor (IIF) in the multilayer reservoir which was heavy oil reservoirs and produced by directional wells. There are mainly four contributions of this paper to the existing body of literature. Firstly, an equivalent simulation method of the pseudo start pressure gradient (PSPG) is developed to quantitatively predict the value of IIF under different geological reservoir conditions. Secondly, the interlayer interference is extended in time, and the time period of the study extends from a water cut stage to the whole process from the oil well open to produce a high water cut. Thirdly, besides the conventional productivity interlayer interference factor (PIIF), a new parameter, that is, the oil recovery interlayer interference factor (RIIF) is put forward. RIIF can be used to evaluate the technical indexes of stratified development and multilayer co-production effectively. Fourthly, the effects of various geological reservoir parameters such as reservoir permeability and crude oil viscosity, etc. on the PIIF and RIIF's type curves are discussed in detail and the typical plate is plotted. The research results provide a foundation for the effective development of multilayer heavy oil reservoirs.

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Section: Validation Of Model Prediction Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative Characterization and Dynamic Law of Interlayer Interference for Multilayer Commingled Production in Heavy Oil Reservoirs by Numerical Simulation

Dong¹,

Zhang²,

Zhu³

et al. 2019

WJET

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show abstract

“…Different from the TPG in tight oil reservoirs caused by ultralow permeability, the TPG in heavy-oil reservoirs is mainly attributed to the abnormal viscosity [11][12][13]. A large number of mechanism studies have shown that the TPG described in heavy-oil simulation could be summarized into the following three methods: pseudo threshold pressure gradient (PTPG) model, piecewise nonlinear model, and variable permeability model.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Waterflooding Heavy Oil Based on Variable Threshold Pressure Gradient

Liu¹,

Zhang³

et al. 2021

Geofluids

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The heavy-oil flow in porous media is characterized by non-Darcy law with variable threshold pressure gradient (TPG) due to the large fluid viscosity. However, available analytical and numerical models hardly consider this effect, which can lead to erroneous results. This paper is aimed at presenting an innovative approach and establishing a numerical simulator to analyze the heavy-oil flow behavior with waterflooding. The apparent viscosity of the oil phase and flow correction coefficient characterized by the TPG were applied to describe the viscosity anomaly of heavy oil. Considering the formation heterogeneity, the TPG was processed into a variable related to mobility and the directionality. The discretization and linearization of the mathematical model were conducted to establish a fully implicit numerical model; the TPG value on each grid node was obtained through oil phase mobility interpolation, and then, the Jacobi matrix was reassembled and calculated to solve pressure and saturation equations. The corresponding simulator was thus developed. The pre-/postprocessing module of the simulator is connected to ECLIPSE; then, an efficient algorithm is introduced to realize a fast solution. Results show that considering the TPG will not only reduce the waterflooding area but also reduce the oil displacement efficiency because of aggravating the nonpiston phenomenon and interlayer conflict. The numerical simulation study on the TPG of heavy oil provides theoretical and technical support for the rational development and adjustment of water-driven heavy oil.

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“…Thus, the interlayer contradictions become prominent and the oilfield development is seriously affected. Many cases on the developmental laws of waterflooding performance via commingling production in multilayer reservoirs have been recorded in different oilfields in the U.S. [1][2][3], China [4][5][6][7][8][9][10][11], Canada [12,13] and Australia [14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs

Shen

Cheng

Sun³

et al. 2018

Energies

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Recently, commingling production has been widely used for the development of offshore heavy oil reservoirs with multilayers. However, the differences between layers in terms of reservoir physical properties, oil properties and pressure have always resulted in interlayer interference, which makes it more difficult to evaluate the producing degree of commingled production. Based on the Buckley–Leverett theory, this paper presents two theoretical models, a one-dimensional linear flow model and a planar radial flow model, for water-flooded multilayer reservoirs. Through the models, this paper establishes a dynamic method to evaluate seepage resistance, sweep efficiency and recovery percent and then conducts an analysis with field data. The result indicates the following: (1) the dynamic difference in seepage resistance is an important form of interlayer interference during the commingled production of an offshore multilayer reservoir; (2) the difference between commingled production and separated production is small within a certain range of permeability ratio or viscosity ratio, but separated production should be adopted when the ratio exceeds a certain value.

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Quantitative characterization of interlayer interference and productivity prediction of directional wells in the multilayer commingled production of ordinary offshore heavy oil reservoirs

Cited by 39 publications

References 2 publications

Quantitative Characterization and Dynamic Law of Interlayer Interference for Multilayer Commingled Production in Heavy Oil Reservoirs by Numerical Simulation

Quantitative Characterization and Dynamic Law of Interlayer Interference for Multilayer Commingled Production in Heavy Oil Reservoirs by Numerical Simulation

Numerical Simulation Study on Waterflooding Heavy Oil Based on Variable Threshold Pressure Gradient

Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs

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