Cementing of casings Sample Clauses

Cementing of casings. Initial plans for cementing IDDP-2 included stage cementing tools (Ingason, et al., 2015), where cementing windows on the casing are opened and closed during the cementing procedure. At later stages it was however decided to simplify the operation by excluding all complications. Instead of using the conventional cementing method of the inner string method, where cement is pumped though the drill-string though stab-in and float collars and up the annulus, a reverse-circulation cementing (RCC) method was used (xxx.xxxx.xx). Using the RCC method the cement is pumped directly into the annulus. The benefit of using reverse cementing is that less cement is lost to the formation and lower load is subjected on the casing allowing for cementing deeper casings. Conventional cementing methods can cause excessive cement waste and associated costs, and expensive retarders can increase the cost further (Xxxxxxxxx & Xxxx, 2010). Advantages of reverse- circulation cementing include (Xxxxxxxxx & Xxxx, 2010): 1. Reduced hydraulic horsepower as the gravitational force is working in favor of the slurry flow. 2. Reduced downhole pressures which works in advantage for not fracturing the formation and puts less load on the casing. 3. Shorter transit and thickening times of the slurry. 4. Improved compressive strength development of the cement as most of the cement will not see the shoe bottomhole temperatures. 5. Less cement waste primarily because no excess cement is pumped back to the surface. Cement blends that are used for high-temperature geothermal xxxxx require blending of additives to ensure longevity and API specification recommend Portland API Class G cement blending up to 40% by weight of cement (BWOC) of silica flour to prevent strength retrogression and increased porosity when exposed to elevated temperatures (Hole, 2008). Special proprietary blends, e.g. Dyckerhoff cement, have also been used in geothermal operations and was used in IDDP-1 with good results although multiple problems, not connected to the cement blend used, arose during cementing operations. Innovation in cement design for high-temperature applications are currently ongoing in several projects, with aim of lowering frictional pressure losses, lowering water content and improving strength characteristics.
Sample 1
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Related to Cementing of casings

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  • Preconstruction Meeting Furnish the names of the Certified Erosion and Sediment Control/Stormwater Supervisor, Certified Foremen, Certified Installers and Certified Designer and notify the Engineer of changes in certified personnel over the life of the contract within 2 days of change. Any company performing work for the North Carolina Department of Transportation has the ethical responsibility to fully disclose any reprimand or dismissal of an employee resulting from improper testing or falsification of records.

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  • General Assembly In addition to the rules described in Section 6.2, the following rules apply:

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