In this paper, a new cement system was developed and resulted in significant gas prevention. Addition of inert particles to cement and their effect on gas migration prevention was investigated. Special types of cements were designed and evaluated for possible use for cementing gas wells. Different chemicals for gas migration prevention were evaluated. The pressure and temperature limitations are 2,000 psi maximum and 350☏. The gas migration set up consisted of the following components: computer, data acquisition, full-length permeability determination, two partial length permeability determinations, cement volume change measurement, gas flow meter, and electronic filtrate weight determination. To address the settling problem and reduce permeability of cement, a formula that resulted in great gas prevention was developed.Ī gas migration set-up helped in testing and optimizing cement formulations to measure gas flow through cement columns. The permeable channels, from which gas flows, cause operational and safety problems at the well site.Ĭurrent high density cement formulations do not provide good gas migration prevention due to settling and subsequent increase in permeability. During this transition, reservoir gases can travel up through the cement column resulting in gas being present at the surface. As cement slurry sets, hydrostatic pressure is reduced on the formation. To control gas migration, cement densities required to successfully cement the zone could be as high as 170 pcf (Pounds per Cubic Foot). The most problematic areas for gas migrations occur in deep gas wells. international petroleum technology conference (14)Ībstract Gas Migration through cement columns has been an industry problem for many years.drilling fluid selection and formulation (81).drilling fluid management & disposal (60).Completion Installation and Operations (35).
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