Water and Gas Coning toward Finite-Conductivity Horizontal Wells: Cone Buildup and Breakthrough

Umnuayponwiwat, S.; Özkan, Erdal

doi:10.2118/60308-ms

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…13, the effect of the gas cone starts while the well is in the early-time radial-flow period and destroys the conventional flow characteristics of the intermediate-and late-time flow (Ozkan 2001). The start of the deviation from the conventional horizontal-well behavior (single-phase flow toward a straight horizontal well in a slab reservoir) is dictated by the physical parameters governing gas coning toward a horizontal well (Chaperon 1986;Giger 1989;Ozkan and Raghavan 1990b;Umnuayponwiwat and Ozkan 2000).…”

Section: Resultsmentioning

confidence: 99%

Pressure-Transient Responses of Horizontal and Curved Wells in Anticlines and Domes

Al-Mohannadi

Özkan

Kazemi

2007

SPE Reservoir Evaluation &Amp; Engineering

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This paper presents a discussion of the pressure-transient responses of horizontal wells in anticlinal structures and curved and undulating wells in slab reservoirs. It confirms that, in the absence of a gas cap, conventional horizontal-well models may be used to approximate the flow characteristics of the systems in which the trajectory of the well does not conform to the curvature of the producing structure. If a gas cap is present, however, the unconformity of the well trajectory and producing layer manifests itself, especially on derivative characteristics when the gas saturation increases around the well. In general, the most significant deviations from the conventional horizontal-well behavior are observed during the buildup periods following long drawdowns. In these cases, the pressure-transient analysis is complicated and requires detailed numerical modeling of the well trajectory and reservoir geometry in the vertical plane. Numerical Simulation of Horizontal-Well Responses In this paper, we have used two finite-difference formulations of transient flow for a horizontal well (see Appendix A). The first formulation was for single-phase flow, and the second formulation was for two-phase flow of oil and gas (the relative permeabilities used in this work are presented in Appendix B). In the latter, we have neglected gas solubility in oil for simplicity. (Solution gas

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Section: Resultsmentioning

confidence: 99%

Pressure-Transient Responses of Horizontal and Curved Wells in Anticlines and Domes

Al-Mohannadi

Özkan

Kazemi

2007

SPE Reservoir Evaluation &Amp; Engineering

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“…They reported that in the case that wellbore pressure drop influences the production significantly, coning and breakthrough take place at the heel and increasing the length of the well does not delay breakthrough. 35 Papatzacos et al developed a semianalytical solution for prediction of the breakthrough time as a function of the rate for gas/water coning in a horizontal well and found good agreement with a set of field data. 36 Sech et al conducted parametric studies and reported that large diametered horizontal wells produced at a high rate will result in poor recovery due to the dominating water-cresting phenomenon unless the ratio of vertical permeability to horizontal permeability is very low, and that rate sensitivity is exacerbated in low-permeability gas reservoirs.…”

Section: Introductionmentioning

confidence: 94%

“…Umnuayponwiwat and Ozkan conducted modeling work on the effect of wellbore pressure drop on the breakthrough time of water and gas coning into a horizontal well and reported that wellbore hydraulics have a strong effect on the shape and breakthrough of the coning. They reported that in the case that wellbore pressure drop influences the production significantly, coning and breakthrough take place at the heel and increasing the length of the well does not delay breakthrough . Papatzacos et al developed a semianalytical solution for prediction of the breakthrough time as a function of the rate for gas/water coning in a horizontal well and found good agreement with a set of field data .…”

Section: Introductionmentioning

confidence: 99%

Method of Predicting the Location of Water Cresting for Horizontal Wells in a Water-Drive Reservoir for Early Prevention

Yue

et al. 2020

ACS Omega

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A method of prediction of location of water cresting and characterizing its intensity in a horizontal well in a water-drive reservoir is introduced for the first time. A mechanistic model for water cresting derived from Darcy’s equation incorporating the main parameters reported in the literature affecting water cresting—viscosity, well distance to the aquifer, wellbore pressure gradient, and reservoir heterogeneity—is introduced with two new characterizing parameters. First is a model-derived parameter, called the breakthrough coefficient, which is defined as the ratio of the average time of breakthrough to the time of breakthrough for a segment of the well, with the model-predicted location of water cresting corresponding to the well segment with the largest breakthrough coefficient. The second is the Cresting index, which is the ratio of the maximum breakthrough coefficient to the minimum breakthrough coefficient as a characterizing parameter, with a well with a higher cresting index corresponding to a faster breakthrough in a group of similar wells. This methodology was validated through a series of sophisticated experimental corefloods and found to predict 78% of the location of the water cresting accurately. The cresting index is found to be weakly correlated with the speed of breakthrough among similar wells.

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“…In 1998, de Souza et al reported a correlation model to predict the breakthrough time, maximum oil rate, and the postbreakthrough behavior of gas and water-cresting in both the horizontal and vertical wells as a function of the grid block size, grid patterns, rate, mobility ratio, drainage area, well height, end point, and shape of the relative permeability . In 2000, Umnuayponwiwat and Ozkan conducted a modeling study on the effect of wellbore pressure drop on the breakthrough time of water and gas coning in horizontal wells and found that wellbore hydraulic has a strong effect on the shape and timing of the breakthrough . They reported that if the wellbore pressure drop is significant, then coning will take place at the heel and increasing the length of the horizontal wells will not delay the breakthrough.…”

Section: Introductionmentioning

confidence: 99%

Field Validation of a Non-logging Alternative Method for the Prediction of the Location of Water-Cresting in Horizontal Wells for Water-Drive Reservoirs

Yue

et al. 2021

ACS Omega

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A previously reported method for a non-logging alternative method for the prediction of the location of water-cresting in horizontal wells for water-drive reservoirs is validated in a field test for the first time in this study. Using this method, the wellbore trajectory, variation in the reservoir permeability, and the pressure gradient data were used to calculate what is called the breakthrough coefficient for the different segments along the length of a set horizontal well with the largest calculated breakthrough coefficient corresponding to the most likely location of the actual water-cresting occurrence. This method was field-validated and found to be in good agreement with log testing for a group of seven wells in an oilfield in Northern China. Another calculated parameter derived from the breakthrough coefficient which is called the variation of the breakthrough coefficients that characterize the effect of the variation of water production along the length of the horizontal well due to the effect of the variation of the wellbore trajectory, permeability, and pressure gradient on the oil production is also introduced. This field validation found variation of the breakthrough coefficients to be weakly and inversely correlated to the oil production in application to a group of 27 wells in the same field.

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Water and Gas Coning toward Finite-Conductivity Horizontal Wells: Cone Buildup and Breakthrough

Cited by 9 publications

References 15 publications

Pressure-Transient Responses of Horizontal and Curved Wells in Anticlines and Domes

Pressure-Transient Responses of Horizontal and Curved Wells in Anticlines and Domes

Method of Predicting the Location of Water Cresting for Horizontal Wells in a Water-Drive Reservoir for Early Prevention

Field Validation of a Non-logging Alternative Method for the Prediction of the Location of Water-Cresting in Horizontal Wells for Water-Drive Reservoirs

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