The compact wellhead serves the same purpose as the convnetional wellhead, that is to serve as the suspension point for the casing strings in the well. The difference is that the compact assembly is just that, compact. It facilitates the suspension and setting of the casing strings over a shorter height. This saves space a … Continue reading Compact Wellhead
There are 8 general categories of additives. Accelerators – Reduces setting time and increases the rate of compressive strength build up. Retarders – Extends the Setting time. Extenders – Lowers the density. Weighting Agents – Increases density. Dispersants – Reduces viscosity. Fluid Loss Control Agents. Lost Circulation Control Agents. Specialty Agents. Accelerators Can be … Continue reading Cementing Additives and Mechanisms
The reasons are as follows; To support the vertical and radial loads applied to the casing Isolate porous formations from the producing zone formations Exclude unwanted sub-surface fluids from the producing interval Protect casing from corrosion Resist chemical deterioration of cement Confine abnormal pore pressure Cement is introduced into the well by means of a … Continue reading Why Cement (a wellbore)?
Formation considerations Homogenous Heterogeneous Naturally Fractured Homogenous-found in heavy oil sands. Easy to accommodate in completion and don't require wellbore segregation. Can be treated with the entire wellbore exposed using coiled tubing or perforated technology. Heterogeneous-reservoir quality and pressure vary between sections of the wellbore. These segments of the wellbore need to be isolated to … Continue reading Horizontal Completions