Interfacial Sealing Properties of Slag Mix (Mud-to-Cement Conversion Technology): Laboratory and Field Evaluation

Nahm, J.J.; Romero, Rene; Javanmardi, Kazem; Wyant, R.E.

doi:10.2118/29407-ms

Cited by 5 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the first tests, the hydraulic pressure VI'. In our previous study, 13 freshwater Class H cements did not exhibit bond regeneration characteristics; the slag cement has given good shear-bond generation in all tests. A second pair of identical tests were also run with computer recording.…”

Section: Bonding To Formationmentioning

confidence: 62%

First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

Sweatman

Nahm

Loeb

et al. 1995

SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

fax 01-214-952-9435. AbstractApplications of a new slag cement and spacer system have reduced the chance of gas channels forming in the cement column during cement hydration in deep, hot south Texas gas wells. These slag cements were formulated with water and conventional cement additives to prevent gas migration and to improve interfacial bonding to oil-wet surfaces. Oil-mud removal spacer fluids (OMRS) were also specially fOlmulated to remove oily residues and improve water-wetting of the oil-wet surfaces. These OMRS can also be designed to develop compressive strength when cementing operations have been completed.Set slag cement provides a tight gas seal with shear-bond healing capacity, as demonstrated by recently developed HTHP shear-bond strength tests. The previously reported phenomenon of healing or regeneration of slag-mix bonds has been reproduced with slag cement. The rapid development of strength at the top of the long cement column and the improved bonding to oil-wet surfaces were the two major improvements provided by the slag cement. OMRS can clean oil-wet surfaces, and then set once the job has been completed.Laboratory tests and field evaluations based on cement bond logs and pressure tests indicated improved bonding and isolation of the gas zones. Field applications of slag cements and OMRS fluids have led to greater primary and plug cementing successes in south Texas gas wells, and well production economics have improved accordingly.

show abstract

Section: Bonding To Formationmentioning

confidence: 62%

First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

Sweatman

Nahm

Loeb

et al. 1995

SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

show abstract

“…The cause of the microfractures observed in laboratory tests has not been fully determined, nor whether they really occur in sub-surface conditions. Naham et al [8][9][10] Benge et al 11,12 and Sabins et al 13 evaluated the performance of slurries made with slag in nonconventional bench apparatus and/or in large-scale simulators. Each demonstrated specific properties of these slurries along with some of the properties of the hardened test samples.…”

Section: State Of the Artmentioning

confidence: 99%

Slag Cementing Versus Conventional Cementing: Comparative Bond Results

Silva¹,

Miranda²,

D'Almeida³

et al. 1997

Proceedings of Latin American and Caribbean Petroleum Engineering Conference

View full text Add to dashboard Cite

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe first publication on the use of slag as a material capable of substituting the traditional Portland cement in well cementing appeared in 1991, when it was seen that it could be added to drilling fluid and solidify it with some advantages over traditional methods.As a result, only recently, the use of this emerging technology has been suggested for situations where difficulty in removing the drilling fluid mud cake has been expected, as in HP/HT wells, for example. In this case, the practical rules for a successful cementing operation cannot always be implemented.As these high temperature wells are fundamental to the exploitation of important Brazilian fields, it was decided, as one of the strategies for overcoming the difficulties in obtaining good cementing results, to invest in evaluating the performance of the slag-mix technology.An extensive research project has therefore been conducted in a large-scale wellbore physical simulator, with the principal objectives of investigating the ease or difficulty of mixing the slag-mix and to evaluate the bond quality obtained after cementing and acidizing the well. Thus, the object of the present paper is to investigate the performance of slag-mix slurries under three distinct scenarios: cementing surface casing; cementing production casing at medium temperatures; and cementing production strings at high temperatures. The resistance of the set slurry to the attack of HCl / HF is measured in a physical simulator under static and dynamic conditions.

show abstract

True Self-Healing Geopolymer Cements for Improved Zonal Isolation and Well Abandonment

Liu

Ramos

Nair

et al. 2017

SPE/IADC Drilling Conference and Exhibition

View full text Add to dashboard Cite

Targeting the incompatibility issue between traditional Portland cements and non-aqueous drilling muds, a mud solidification technique based on geopolymer cements was recently introduced to the industry. This technique was achieved by incorporating non-aqueous fluids (NAF) such as synthetic-based or oil-based drilling mud in a geopolymer cement that is formed by blending an aluminosilicate powder with an alkaline activating solution. In a previously completed study, the consolidated mud, or "geopolymer hybrid", was evaluated for its compressive strength, thickening time and stability for applications including primary cementing as well as lost circulation control. In an effort to further develop the geopolymer hybrid system as a new generation well cementing material, the present work comprehensively studies their mechanical properties, self-healing capabilities and cement-to-pipe bond strength. One of the concerns currently preventing the use of geopolymers for well cementing is its low early compressive strength. This study shows that although the early age uniaxial compressive strength of geopolymer is lower than that of Portland cement, with an applied confining stress, geopolymers have more than sufficient strength for primary cementing applications. Furthermore, the abilities of cement to properly bond with steel casing and rock formations, as well as to withstand subsurface stress changes over time are of paramount importance for long-term cement integrity. The triaxial tests performed in this study show that geopolymers are less brittle than Portland cement, and can therefore accommodate stress changes without localized failure. The geopolymer bond strength measurements showed that geopolymer could bond to steel even in presence of non-aqueous drilling muds. In addition, the triaxial tests revealed that geopolymers exhibit true self-healing capabilities, characterized by samples fully regaining their mechanical competence with 28 day post-failure strength exceeding the native 7-day strength. Portland cement, in comparison, retained lower ultimate strength than its 7-day strength. The self-healing capability of geopolymers is ideally suited to adapt to subsurface stress changes, making such materials ideally suited for use as permanent barriers in plug and abandonment operations.

show abstract

Interfacial Sealing Properties of Slag Mix (Mud-to-Cement Conversion Technology): Laboratory and Field Evaluation

Abstract: Shell Development Co.; Kazem JavanmardL* Shell Offshore Inc.; and R.E. Wyant, Consultant q SPE Metnbem -M law, sPEnAocOrilling cduenoe. Thk$p8per vmpropwd Iorpre8enIatbn aItha lSS5SPE/lAOC OrillingCo@aenw hold in Amswdwn, 2S F9bnMwy-2Maroh 1SS5.

Cited by 5 publications

References 15 publications

First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

Slag Cementing Versus Conventional Cementing: Comparative Bond Results

True Self-Healing Geopolymer Cements for Improved Zonal Isolation and Well Abandonment

Contact Info

Product

Resources

About