Flow into Slotted Liners and an Application of the Theory to Core Analysis

Dodson, C.; Cardwell, William

doi:10.2118/945056-g

Cited by 7 publications

(11 citation statements)

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“…Following Sellm and Kirkham (1974), and clues from Byerly (1893, p. 234, problem 9) and Dodson and Cardwell (1945), a potential function <j) may be found which satisfies Laplace's equation 2(see Appendix A) at all points in the flow region of Fig. 4, and the boundary conditions…”

Section: Potential Functionmentioning

confidence: 99%

“…He also showed that the reduction in well productivity due to slotted liners is relatively small as compared with that due to circular perforations. Dodson and Cardwell (1945) discussed the effect of slotted liners on the productivity of an oil well. They formulated the problem for a rectangular array of discontinuous slots in terms of pressure head and presented an approximate form for the pressure function.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In 15, I and K are modified Bessel functions of the first and ' second kind, respectively, of order v. Information on the use of such series as given by (15) is in Smythe (1968, Chapter V, see especially problem 106, p. 209), Dodson and Cardwell (1945), and Selim and Kirkham (1974).…”

Section: Potential Functionmentioning

confidence: 99%

“…However, Muskat indicated that, in order to obtain a uniform potential over the well surface, the flux density must be varied. Dodson and Cardwell (1945) where from Todd (1959), for a length s of fully screened well (flow is purely radial and we now used K for k of Fig. 4), we have "oso that putting of (1) and of (72) into 73gives…”

Section: Potential Functionmentioning

confidence: 99%

“…Verification of the data presented in Figs. 7 and 8 can be made from graphs given by Dodson and Cardwell (1945) and Muskat (1942).…”

Section: Flow Into Slotted Well Pipementioning

confidence: 99%

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Groundwater flow theory for perforations in well casings and soil drain tubes

Hashem

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Section: Potential Functionmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Potential Functionmentioning

confidence: 99%

Section: Potential Functionmentioning

confidence: 99%

“…Verification of the data presented in Figs. 7 and 8 can be made from graphs given by Dodson and Cardwell (1945) and Muskat (1942).…”

Section: Flow Into Slotted Well Pipementioning

confidence: 99%

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Groundwater flow theory for perforations in well casings and soil drain tubes

Hashem

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Standalone Sand Control Failure: The Role of Wellbore and Near Wellbore Hydro-Thermo-Chemical Phenomenon on the Plugging and the Flow Performance Impairments of the Standalone Sand Screen

Mahmoudi

Roostaei

Fattahpour

et al. 2018

Day 3 Thu, November 29, 2018

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Although several workflows have been developed over the years for the design of the optimal sand control solutions in thermal applications, numerous sand control failures still occur every year. This paper aims at assessing the failure mechanism of different sand control techniques and the factors contributing to the failure by analyzing different failed sand control screen samples recovered from thermal and non-thermal wells. Several failed standalone screens have been studied, which were collected from various fields and operational conditions. The screens were first inspected visually, and then certain sections of screens/pipes were selected for more detailed study on the failure mechanism. The liners/screens were cut into sections to be studied through SEM-EDX, reflective light microscopy, X-ray micro CT scan and petrographic thin sections to better understand the localized plugging mechanism. Through the studies of several polished sections, a statistical variation of the plugging zone was found. Moreover, we further focused on the critical zones such as the inlet and outlet of the aperture and the zone adjacent to the formation to better investigate the plugging mechanism. The study on wire wrap screen samples revealed significant plugging of the annular space between the base pipe and the screen. Extensive clay/fines buildup in the annular space led to full to partial clogging in some sections. The base pipe corrosion study reveals that the corrosion mechanism is highly flow dependent since the perforation on the base pipe was enlarged to an oval shape from the original circular shape with its larger axis pointing toward the flow direction. The size of the plugged zone was significantly higher in the outer diameter section where a mixture of the clay and corrosion byproducts plugged the near screen pore space and the screen aperture. Examined premium mesh screen samples showed that the plugging mechanism is highly sensitive to the mesh size and assembly process. The highest pore impairments were associated with mesh screens in which the mesh was directly wrapped around the base pipe causing a reduced annular gap for the flow toward the perforations. The investigation of slotted liner samples showed widest plugging zone in the slot entrance and the lowest on the slot wall. A distinct interplay of the clay and corrosion byproduct led to the adsorption of clay, forming a compacted layer over the slot wall. This paper reviews the plugging mechanism of the standalone sand control screen obtained from the field to provide first-hand evidence of the plugging mechanism and provides explanations for some of the poor field performances. The results could help engineers to better understand the micro-scale mechanisms leading to sand control plugging.

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Design Optimization of Slotted Liner Completions in Cased and Perforated Wells: A Numerical Skin Model

Velayati

Roostaei

Fattahpour

et al. 2018

Day 1 Mon, December 10, 2018

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Several parameters affect the skin factor of the cased and perforated (C&P) wells completed with slotted liners. Existing skin factor models for slotted liners account for such factors as the flow convergence, pressure drop and partial production but neglect phenomena such as partial plugging of the screen or near-wellbore permeability alterations during the production. This paper discusses these factors and incorporates them into a skin model using a finite volume simulation. The finite volume analysis evaluates the skin factor as a result of pressure drop in the gap between the casing wall and the slotted liner. This skin model accounts for: 1) the perforation density and phasing, 2) slotted liner specifications, and 3) different amount of sand accumulation in the annular space between the casing and the sand screen. A semi-analytical pressure drop model is also linked to the numerical model to incorporate the skin factor due to flow convergence behind the perforations. The results of finite volume analysis reveal that a low perforation density would behave close to the open-hole completion for sand-free casing-liner annular space. Conversely, pressure drops were found to be significant for a partially or totally filled space. Additionally, it was found that the optimum completion design occurs if the slotted liner joints are in line with the casing joints. Besides, a partially perforated casing or a partially open sand screen increases the distance fluids have to travel in the annular space and intensifies the skin factor. This paper provides skin models derived for vertical and perforated wells completed with slotted liner sand screens using the finite volume simulations. Each part of the model has been verified against existing numerical models in the literature. The model improves the understanding of flow performance of the sand screens and skin factor, which in turn leads to a better design of sand control completions.

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Flow into Slotted Liners and an Application of the Theory to Core Analysis

Cited by 7 publications

References 0 publications

Groundwater flow theory for perforations in well casings and soil drain tubes

Groundwater flow theory for perforations in well casings and soil drain tubes

Standalone Sand Control Failure: The Role of Wellbore and Near Wellbore Hydro-Thermo-Chemical Phenomenon on the Plugging and the Flow Performance Impairments of the Standalone Sand Screen

Design Optimization of Slotted Liner Completions in Cased and Perforated Wells: A Numerical Skin Model

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