Laserfiche WebLink
<br />r, <br />u <br />3.11.5. Cement Monitoring <br />During the cementing operations, the annular flow shall be monitored for cement returns to surfacf <br />If the cementing operation does not obtain isolation of the fresh water, remedial cementing shall b~ <br />done in accordance with section 3.13.12. <br />3.11.6. Cement Quality <br />Surface casing cement shall be sulphate-resistant if sulphur-bearing waters are anticipated in the <br />next segment of a well. (Refer to API Specification 10: Class of Cement and mill grind of cement <br />to confirm sulphate resistance of cement.) <br />3.11.7. Cementing Procedure <br />The surface casing cement shall be under-displaced to retain a minimum of 5 metres of <br />contaminated tail cement. <br />3.11.8. Pre-Flush <br />If the surface hole is drilled using viscous drilling mud, apre-flush shall be circulated to remove m~ <br />and filter cake before the cement is pumped into the casing. <br />3.11.9. Slurry Samples <br />Slurry samples shall be obtained during the start, middle and end of the cementing operation to <br />observe set-up time, curing time, and compressive strength of the cement. <br />3.11.10. Wait on Cement (WOC) <br />The operator shall collect cement samples while cementing and use them as a guide to determine <br />sufficient WOC time. WOC time shall be sufficient for the cement to: <br />(a) obtain a compressive strength adequate to support the casing and well control equipment; an <br />(b) to withstand the pressure integrity test. <br />3.11.11. Compressive Strength <br />Drill-out operations shall not commence until the cement samples exhibit a compressive strength o <br />3600 kPa as determined by cement tables and visual examination of the samples, <br />3.11.12. Pressure Test <br />A pressure test shall be conducted on the casing before the cement is drilled out of the shoe joint t <br />ensure that the casing can hold pressure and that all surface pressure control equipment, casing, <br />and the casing seat can handle the formation pressures which are anticipated in the next segment <br />of the well. <br />3.11.13. Pressure Integrity Test (PIT) <br />After the cement in the shoe joint and a maximum of 0.5 metre of new formation have been drilled, <br />the operator shall conduct a PIT: <br />(a) using a low volume, high pressure pump; <br />(b) applying pressure on the formation at a level equivalent to a gradient of 18 kPa per metre; <br />(c) for a duration of ten (10) minutes; <br />(d) using an incompressible fluid to apply the pressure for the test; and <br />14 <br /> <br />