The Effect of Gel Strength of Cement Slurry in Preventing Gas Migration

Abstract

Previous research on annular gas flow has shown that the behavior of cement between its fluid and set states is the controlling factor that may allow gas entry. This transition phase of cement previously has not been recognized in slurry design since its importance was not fully understood and since test procedures for its definition has not been presented or establishedTo predict the occurrence of annular gas flow and to design cement slurries capable of helping to prevent annular gas flow, it is necessary to define the slurry characteristics at the beginning and the end of this transition period as well as the period of time of the transition state.  Test  techniques  have  been developed to study the start of this transition period. Additional tests have been conducted to define the condition of cement required to prevent gas entry. The test techniques developed to define this transition period of cement slurry are described.
Numerous job variables such as pumping time, placement time, slurry composition, and circulating temperature and pressure were investigated to evaluate their influence on transition time. A method for using transition time and static gel strength (SGS) development data to help predicting annular gas flow and to evaluate annular gas flow control materials, is discussed

References

 [1] Sabins;F.L;Tinsley;J.M.and Sutton;D.L, Transition Time of Cement Slurries
     Between the Fluid and  Set States. Paper SPE 39279;PP.875-881,(1982).
   [2] Buraik;K.A.; Abdulqer;K.A.and Basibes;R, Prevention of  Shallow Gas
      Migration Through Cement.Paper SPE 47745, (1998).
[3] Boumgarte;C.;Thiercelin;M.;and  Klaus;D, Case studies of Expanding Cement to
     Prevent  Micro annular Formation. Paper SPE 56535, (1999).
[4] Robert;M., Gas Flow in Cements. Paper SPE 11207,(1985).
[5] Stewart; R.B;and Schouten; F.C. Gas Invasion and Migration in Cemented
     Annuli.Paper SPE Drilling Engineering. PP.77-82;(1988).
[6] Jennings ;S.S ;and Ansari;A.A ,Gas Migration After Cementing Greatly Reduced.
      Paper  SPE;(2003).
 
 
Journal of Petroleum Research
Volume 15, Issue 52 - Serial Number 52
September and October 2006
Pages 45-53

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