Evolution of Open-Hole Gravel Pack Methodology in a Low Frac-Window Environment: Case Histories and Lessons Learned From the Kraken Field Development

Alexander, Kevin M.; Bruce, D Hammock; Williamson, Colin; Moses, Nicholas; Ismayilov, Elnur; Sallis, Jonathan; Kock, Tertius De; Sendel, Honore; Beldongar, Maye; Gadiyar, Bala; Parlar, Mehmet

doi:10.2118/195937-ms

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…The β wave reverse packing starts at plugging location and the length from the heel of wellbore to plugging location is α wave packing length. There are many factors influencing the length of α wave packing [12][13][14][15][16], including pump rate, sand ratio, carrier fluid leakoff, washpipe/screen ratio, carrier fluid viscosity, fluid density and gravel density. For gravel packing of long horizontal wells in deepwater, the successful completion of α wave packing is an important first step.…”

Section: Determination Methods Of Packing Length In α Wave Packing Stagementioning

confidence: 99%

The Gravel Packing Length Determination Method and Influencing Factors Analysis in Deepwater Horizontal Wells

Huang¹,

Wen²,

Xing³

et al. 2022

Geofluids

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Horizontal well gravel packing is the most commonly used sand control technology in offshore oil and gas fields. For extreme conditions such as deepwater, low fracture pressure formations, and long horizontal well bore length, targeted and cost-effective measures are required. According to the friction models in different stages of gravel packing process of horizontal well, the corresponding friction is calculated and compared. According to the calculation, during the entire packing process, the washpipe/screen annular friction is the largest in β wave packing stage, which reflects that higher packing pressure is required in this stage, and the formation fracture pressure is easily broken at this stage. According to the equilibrium flow velocity, the calculation method and flow chart of α -wave sand bed height were put forward. The criterion and calculation method of packing length were designed. The influencing factors of viscosity, density and leakage rate of carrier fluid on α-wave packing length were discussed. The quantitative analysis was carried out. The design and calculation method of α-β wave packing length considering the successful completion of α wave packing and the successful completion of β wave reverse packing was put forward. The corresponding software was compiled to discuss and calculate the quantitative analysis of the factors affecting the α-β wave packing length, such as the density of carrier fluid, gravel density and washpipe/screen ratio. For specific conditions, certain criteria and methods can be used to design and optimize horizontal well gravel packing length.

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Section: Determination Methods Of Packing Length In α Wave Packing Stagementioning

confidence: 99%

The Gravel Packing Length Determination Method and Influencing Factors Analysis in Deepwater Horizontal Wells

Huang¹,

Wen²,

Xing³

et al. 2022

Geofluids

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“…Assuming that the horizontal well is far away from the boundary or the surrounding injection wells and the fluid loss to the formation is stable seepage, the fluid loss rate to the formation can be expressed by the following equation: Combined with the temperature Equation ( 1)-( 3), friction calculation model ( 4)-( 6), and flow model ( 7)- (10), a multifield coupling model of gravel packing for deepwater HT/HP horizontal wells was established.…”

Section: The Carrier Fluid Loss Modelmentioning

confidence: 99%

“…Both of these conditions can lead to premature plug and pack failure, which can make the packing process very complicated and difficult to control. [10][11][12][13] In extreme situations, such as significant temperature variation of the deep water reservoir (low temperature near the mud line → HT in a deep reservoir), low fracture pressure at high-pressure (HP) formation, and medium and high permeability, gravel packing operation faces extremely high operational risks and key technical difficulties. Mainly because high porosity and high permeability lead to large sand production, and low fracture pressure at HP formation leads to narrow operation windows.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and application analysis of gravel packing in deepwater HT/HP wells

Yu¹,

Jiang²,

Wang³

et al. 2022

Energy Science & Engineering

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Gravel packing is one of the main sand control methods for deep-water hightemperature and high-pressure (HT/HP) reservoirs. According to the specific characteristics of deep-water HT/HP and multichannel, considering the influence of slurry flowing through long-distance multichannel and the slurry temperature alternation along the flow path, based on α-β wave packing theory, a coupling model of gravel packing in deep-water HT/HP horizontal wells is established. The packing simulation algorithm and calculation process are designed to realize the gravel packing temperature pressure simulation and multistage refined friction calculation of deep-water HT/HP horizontal wells. The influence of each packing parameter on the packing process is fully studied. Furthermore, the application simulation of the A10H well of the South China Sea deepwater HP well is carried out. The simulation results show that in the slurry injection stage and α wave packing stage, the packing pressure is low and the residual pressure window is large. In the β wave packing stage, the packing pressure increases rapidly, the residual pressure window shrinks rapidly, and finally, at the end of β wave packing, the residual pressure window becomes narrow. The viscosity of carrier fluid has a significant impact on the pressure window of packing operation. For the design pump rate of 5.6 bpm, the packing cannot be completed with 5.0 cp viscosity carrier fluid. For the carrier fluid with high viscosity, the multi-β wave packing technique of pump reduction control pressure at the end of the β wave packing stage is used, and this process is simulated in this paper.Considering three constraints: not sand packed in the drilling string, without premature bridging in the α wave packing stage, and α and β wave packing pressure control conditions, the safe range of pump rate is determined under different operation safety margin conditions, which can provide technical support for on-site operation.

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A Fast Method of Selecting Offshore Oil Well Candidates for Multi Zone Cased Hole Frac Pack or Open Hole Completions for CNPC-Dagang Zhaodong Mature Oilfield: Case Study

Wang¹,

Chi²,

Wang³

et al. 2021

Day 2 Wed, October 06, 2021

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To remain economical, mature offshore oil fields require unique, time-efficient and cost-efficient drilling and completion operations for each well. This paper is a case study of a rapid selection method for determining the operational process for each offshore oil well candidate and its application in the Zhaodong oilfield. In mature oilfields, maintaining production requires drilling and completing sidetrack wells. There are 3 key steps to rapidly selecting the most suitable drilling, completion and operational strategy for each well. First, review historical production data and operational costs to set production targets for each well. Second, evaluate the potential drilling and completion operations both technically and economically to achieve the target. Third, optimize the selected operations based on prior field application and production results. This process was applied with newly sidetracked wells in the Zhaodong oilfield. The wells were either completed using a multi-zone cased hole fracturing technique or an open hole completion technique, per the selection process. One candidate well completed with the multi-zone fracturing technique had a daily production rate of 134 tons of oil, and another candidate well completed with an open hole technique had a production rate of 236 tons of oil. These two wells were the most prolific in the Zhaodong oilfield. Using relatively basic engineering work integrated with simple economic calculations, this methodology is far less complicated and costly than computer simulation modeling for the operator. The performance in the Zhaodong oilfield reinforces this methodology used for selecting the proper candidate and completion process, providing more value and confidence for offshore operators.

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Evolution of Open-Hole Gravel Pack Methodology in a Low Frac-Window Environment: Case Histories and Lessons Learned From the Kraken Field Development

Cited by 11 publications

References 24 publications

The Gravel Packing Length Determination Method and Influencing Factors Analysis in Deepwater Horizontal Wells

The Gravel Packing Length Determination Method and Influencing Factors Analysis in Deepwater Horizontal Wells

Simulation and application analysis of gravel packing in deepwater HT/HP wells

A Fast Method of Selecting Offshore Oil Well Candidates for Multi Zone Cased Hole Frac Pack or Open Hole Completions for CNPC-Dagang Zhaodong Mature Oilfield: Case Study

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