Transient Pressure Analysis in Partially Perforated Vertical Wells

Ouyang, Weiping; Yang, Dongya; Sun, Hedong

doi:10.1007/978-981-13-7127-1_81

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…A coupling model of reservoir seepage and pipe flow in a wellbore was developed by Ouyang et al [26]. The models of radial flow, axial flow, and semi-circular radiation flow were created by Li et al using the finite element method after studying the two-dimensional analytical solution model of ideal flow [27].…”

Section: Introductionmentioning

confidence: 99%

Productivity Prediction Model of Perforated Horizontal Well Based on Permeability Calculation in Near-Well High Permeability Reservoir Area

Zhang,

Guo,

Gao

et al. 2024

ENERGY

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To improve the productivity of oil wells, perforation technology is usually used to improve the productivity of horizontal wells in oilfield exploitation. After the perforation operation, the perforation channel around the wellbore will form a near-well high-permeability reservoir area with the penetration depth as the radius, that is, the formation has different permeability characteristics with the perforation depth as the dividing line. Generally, the permeability is measured by the permeability tester, but this approach has a high workload and limited application. In this paper, according to the reservoir characteristics of perforated horizontal wells, the reservoir is divided into two areas: the original reservoir area and the near-well high permeability reservoir area. Based on the theory of seepage mechanics and the formula of open hole productivity, the permeability calculation formula of near-well high permeability reservoir area with perforation parameters is deduced. According to the principle of seepage continuity, the seepage is regarded as the synthesis of two directions: the horizontal plane elliptic seepage field and the vertical plane radial seepage field, and the oil well productivity prediction model of the perforated horizontal well is established by partition. The model comparison demonstrates that the model is reasonable and feasible. To calculate and analyze the effect of oil well production and the law of influencing factors, actual production data of the oilfield are substituted into the oil well productivity formula. It can effectively guide the technical process design and effect prediction of perforated horizontal wells. KEYWORDSPerforated horizontal well; permeability; productivity model; sensitivity analysis Designation K 1 Original formation permeability, μm 2 K 2 Permeability of perforation zone, μm 2 r e Supply boundary radius, m r w Wellbore radius, m r p Perforation radius, m r 1 Wellbore radius converted by perforation completion, m r 2 Wellbore radius converted by perforation completion, m r 0 Circular isobaric radius, m L p Perforation length (perforation depth), m n Perforation density, hole/m q Borehole well production, m 3 /d p wf Bottom hole flowing pressure, MPa p e Boundary pressure, MPa h Formation thickness, m μ Formation crude oil viscosity, mPa•s B Crude oil conversion coefficient, underground/ground tons θ Perforation phase angle a Horizontal elliptical seepage field long semi-axis of horizontal well, m b Horizontal elliptical seepage field short half axis of horizontal well, m L Horizontal section length of perforated horizontal well, m Q Perforated horizontal well productivity, m 3 /d p 1 Boundary pressure of horizontal well near wellbore area, MPa p 2 Circular isobaric boundary pressure, MPa p 3 Boundary pressure of outer edge of near-well high permeability reservoir area, MPa

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Section: Introductionmentioning

confidence: 99%

Productivity Prediction Model of Perforated Horizontal Well Based on Permeability Calculation in Near-Well High Permeability Reservoir Area

Zhang,

Guo,

Gao

et al. 2024

ENERGY

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“…Li et al [32] estimated the formation damage with a numerical model of multiphase flow in a CO 2 flooding system. Ouyang et al [33] investigated the characteristics of a formation damaged zone with a numerical model of multiphase flow. However, the characteristics of the flow regime of the transitional zone were ignored in the above models of two-phase flow, which might be helpful in history matching.…”

Section: Introductionmentioning

confidence: 99%

A Two-Phase Numerical Model of Well Test Analysis to Characterize Formation Damage in Near-Well Regions of Injection Wells

Zhang

Cheng

et al. 2021

Geofluids

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Formation damage usually occurs in near-well regions for injection wells completed in offshore oilfields under the development of line drive patterns. However, current works on characterizing the damage by well test analysis were basically focused on using single-phase analogy to solve two-phase flow issues, resulting in errors on the diagnosis and interpretation of transient pressure data. In this paper, we developed a two-phase model to simulate the pressure transient behavior of a water injection well in a multiwell system. To solve the model more efficiently, we used the finite volume method to discretize partially differential flow equations in a hybrid grid system, including both Cartesian and radial meshes. The fully implicit Newton-Raphson method was also employed to solve the equations in our model. With this methodology, we compared the resulting solutions with a commercial simulator. Our results keep a good agreement with the solutions from the simulator. We then graphed the solutions on a log-log plot and concluded that the effects of transitional zone and interwell interference can be individually identified by analyzing specific flow regimes on the plot. Further, seven scenarios were raised to understand the parameters which dominate the pressure transient behavior of these flow regimes. Finally, we showed a workflow and verified the applicability of our model by demonstrating a case study in a Chinese offshore oilfield. Our model provides a useful tool to reduce errors in the interpretation of pressure transient data derived from injection wells located in a line drive pattern.

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Transient Pressure Analysis in Partially Perforated Vertical Wells

Cited by 2 publications

References 17 publications

Productivity Prediction Model of Perforated Horizontal Well Based on Permeability Calculation in Near-Well High Permeability Reservoir Area

Productivity Prediction Model of Perforated Horizontal Well Based on Permeability Calculation in Near-Well High Permeability Reservoir Area

A Two-Phase Numerical Model of Well Test Analysis to Characterize Formation Damage in Near-Well Regions of Injection Wells

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