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<br /> <br />(i) gas is encountered with HZS content greater than 100 ppm, <br />(ii) when crude oil flows to surface or is capable of unloading during bailing operations, or <br />(iii) when flows of natural gas exceed 7.0 103m3/D (250 Mcfd). <br /> <br />3.12.20. Rotary Well Control Equipment <br />Well control equipment in addition to the requirements under Part 4 shall be installed when drilling <br />the well underbalanced, with air, gas or foam. When a rotating head is installed as a part of this <br />additional well control equipment, it shall be attached directly to the BOP system and a sufficient <br />diameter side outlet installed to minimize pressure above the BOP. <br />3.12.21. Cementing <br />The top of the cement in the production casing annulus shall be placed inside the previous <br />intermediate casing to a height of 25 metres above the intermediate casing seat; but in every case, <br />not less than 100 metres above the highest potential pay zone. In the case: <br />(a) of a corrosive zone behind the intermediate casing that has not been covered with cement, th• <br />cement in the production casing annulus shall be sufficient to rise 25 metres above the top of <br />the corrosive zone; <br />(b) where liners are used, they shall be cemented across their full length; <br />(c) of disposal and injection well casings, cement tops shall be as outlined in Part 7; <br />(d) of a well located in a water covered area, the production casing shall be cemented to surface <br />before production commences; and <br />in all cases, the operator shall provide for an Examiner to certify cement tops. <br />3.12.22. Cement Volume <br />Cement volume shall be based on caliper volume, if available, or theoretical annular hole volume <br />plus the volume of the shoe joint plus: <br />(a) 30% excess cement if cement volume is based on theoretical calculation; or <br />(b) 20% excess cement shall be used up to the designed cement top if cement volume is based <br />on a caliper volume. <br />3.12.23. Cement Quality <br />Cement quality across the potential pay zone shall be no less than the classification of neat cemen <br />without volume extenders and: <br />(a) the water used to mix cement shall be of a quality and temperature required to achieve <br />maximum compressive strength for the cement; and <br />(b) a casing shoe joint with a minimum length of five metres shall be run to retain contaminated <br />tail cement. <br />3.12.24. Cement Placement <br />The operator shall place cement: <br />(a) by displacement with an appropriate wiper plug to separate the cement from the displacing <br />fluid; <br />(b) with afloat-type collar, alatch-down type collar, or a baffle plate run above the shoe joint so <br />that a wiper plug can be used to provide a positive stop io cement displacement; <br />(c) using a preflush fluid or scavenger cement to remove the drilling fluid and the filter cake and t <br />18 <br />r <br />