Sizing Gelant Treatments in Hydraulically Fractured Production Wells

Seright, R.S.; Seldal, Mailin; Liang, J.

doi:10.2523/38835-ms

Cited by 4 publications

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“…The mechanism of action that we envision for these treatments involves: (1) gelant injection with subsequent flow through the fracture system, accompanied by gelant leakoff through the fracture faces into both the oil and water zones, (2) shut-in to allow gel to form, and (3) return to production, with the gel substantially retarding water flow from the matrix into the fracture system but inhibiting oil flow to a significantly lesser degree. 36 The success of these treatments depends on the distance of gelant leakoff and the residual resistance factors in the oil and water zones.…”

Section: The Gelant and Treatment Resultsmentioning

confidence: 99%

Conformance Improvement Using Gels

Seright¹

2002

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Section: The Gelant and Treatment Resultsmentioning

confidence: 99%

Conformance Improvement Using Gels

Seright¹

2002

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“…7 In contrast when treating fractures, a significant oil residual resistance factor (permeability reduction value for oil) can be tolerated so long as (1) the permeability to water is reduced much more (e.g., >50 times more) than that to oil and (2) the distances of gelant leakoff from the fracture faces are controlled. 8,9 "Clean Up" Behavior. For many field applications of gel treatments in production wells, oil productivity gradually increased or "cleaned up" during the first weeks after the treatments were applied.…”

Section: Throughput Dependence Of Oil and Water Permeabilitiesmentioning

confidence: 99%

“…In contrast, disproportionate permeability reduction in the porous rock next to fracture faces is eminently useful and exploitable for fractures that cut through both water and hydrocarbon zones. [7][8][9] We should leave some hope that value could be found for disproportionate permeability reduction in fractures. Recall that all breaching pressure gradients reported in this chapter were measured at a fixed injection rate of 100 cm 3 /hr.…”

Section: Disproportionate Permeability Reduction In Fracturesmentioning

confidence: 99%

“…Of course, in addition to minimizing damage to oil productivity, we desire a gel treatment that causes substantial reduction to water productivity. [7][8][9] As mentioned, the parameter, (F rr -1)L p , should have a value greater than 3,000 ft in the water zone. To assess the appropriate distances of gel penetration, L p , we need the water residual resistance factor, F rrw .…”

Section: Effect On Ultimate Oil Productivitymentioning

confidence: 99%

“…Basic engineering calculations reveal that materials that provide "relative permeability modification" or "disproportionate permeability reduction" are currently of far more practical use when treating linear flow features (e.g., fractures) than when treating radial flow problems (e.g., wells without fractures). [7][8][9] For these materials to effectively treat radial flow, they should reduce permeability to water by more than a factor of 10 (and preferably by more than a factor of 20). At the same time, they must reduce permeability to oil by less than a factor of two.…”

Section: Throughput Dependence Of Oil and Water Permeabilitiesmentioning

confidence: 99%

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Conformance Improvement Using Gels

Seright¹

2004

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This report describes work performed during the third and final year of the project, "Conformance Improvement Using Gels." Corefloods revealed throughput dependencies of permeability reduction by polymers and gels that were much more prolonged during oil flow than water flow. This behavior was explained using simple mobility ratio arguments. A model was developed that quantitatively fits the results and predicts "clean up" times for oil productivity when production wells are returned to service after application of a polymer or gel treatment.X-ray computed microtomography studies of gels in strongly water-wet Berea sandstone and strongly oil-wet porous polyethylene suggested that oil penetration through gel-filled pores occurs by a gel-dehydration mechanism, rather than gel-ripping or gel-displacement mechanisms. In contrast, analysis of data from the University of Kansas suggests that the gelripping or displacement mechanisms are more important in more permeable, strongly water-wet sandpacks. These findings help to explain why aqueous gels can reduce permeability to water more than to oil under different conditions.Since cement is the most commonly used material for water shutoff, we considered when gels are preferred over cements. Our analysis and experimental results indicated that cement cannot be expected to completely fill (top to bottom) a vertical fracture of any width, except near the wellbore. For vertical fractures with apertures less than 4 mm, the cement slurry will simply not penetrate very far into the fracture. For vertical fractures with apertures greater than 4 mm, the slurry may penetrate a substantial distance into the bottom part of the fracture. However, except near the wellbore, the upper part of the fracture will remain open due to gravity segregation.We compared various approaches to plugging fractures using gels, including (1) varying polymer content, (2) varying placement (extrusion) rate, (3) using partially formed gels, (4) using combinations of high and low molecular weight (Mw) polymers, (5) using secondary crosslinking reactions, (6) injecting un-hydrated polymer particles, and (7) incorporating particulates. All of these methods showed promise in some aspects, but required performance improvements in other aspects. All materials investigated to date showed significant performance variations with fracture width. High pressure gradients and limited distance of penetration are common problems in tight fractures. Gravity segregation and low resistance to breaching are common problems in wide fractures. These will be key issues to address in future work.Although gels can exhibit disproportionate permeability reduction in fractures, the levels of permeability reduction for oil flow are too high to allow practical exploitation in most circumstances. In contrast, disproportionate permeability reduction provided by gels that form in porous rock (adjacent to the fractures) has considerable potential in fractured systems. ix iv EXECUTIVE SUMMARYThis report describes work performed...

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Revisión general de la producción elevada de agua en la industria del petróleo

Hernández

Maldonado

Rodriguez

2019

revfue

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En el presente artículo se realiza una revisión detallada sobre las características y generalidades de la producción elevada de agua en las operaciones de la industria petrolera, relacionando volúmenes de producción con los problemas técnicos que pueden estar generando dichos excesos de fluido, métodos de identificación y diagnóstico de un alto corte de agua, metodologías utilizadas por la industria tanto mecánicas y químicas para mitigar los volúmenes excesivos del recurso hídrico; para finalmente abordar el tema de la disposición final y uso de las aguas de producción de la industria del petróleo, teniendo en cuenta cifras y porcentajes.

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Sizing Gelant Treatments in Hydraulically Fractured Production Wells

Cited by 4 publications

References 0 publications

Conformance Improvement Using Gels

Conformance Improvement Using Gels

Conformance Improvement Using Gels

Revisión general de la producción elevada de agua en la industria del petróleo

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