..., severe fluid losses, high mud costs, formation damage, and post-well production issues. Clear fluid brine systems such as Calcium Chloride (CaCl 2 ) and Calcium Bromide (CaBr 2 ) are usually preferred because of their compatibility with coals and their ability to minimize formation damage. However...

...: Influx No Influx Acceptable Periodic Acceptable Yes, Continuous What are the goals /expectations of utilization of MPD? Cure Losses – Partial Losses – Severe Losses – Total Losses Reduction in reduced formation damage due to degree of overbalance Avoid...

... or minimizing lost circulation where no drilling time would be lost due to cure losses, also to reduce the formation damage. The C-349 H well was the first UBD horizontal well drilled by AGOCO. The paper discusses the objectives, planning, and the performance of horizontal UBD well as the first well drilled...

... wells identified the use of MPD as a possible partial solution to mitigate the usual loss circulation scenario. This document describes the successful implementation of the MPD technique as a supplemental aid for cementing jobs, eliminating cement losses, avoiding formation damage, reducing mud losses...

... model. Fine grids are used to capture dynamic effects of pressure and saturation in the near-wellbore region. To model the formation damage in the near wellbore region, an integrated approach is introduced that combines dynamic reservoir simulation and local formation damage based on dynamic core flood...

... UBD is expected to prevent formation damage and improve well productivity, in some low permeability cases with high capillary pressure counter-current imbibition occurs and reduces well productivity specially for open hole completed horizontal wells. In this paper a new approach to model possible...

... underbalanced drilling Upstream Oil & Gas fidaa field drilling fluid Libya Directional Drilling circulation formation damage productivity conventional drilling problem enhance recovery calender time sabah field production rate recovery horizontal well reservoir zueitina oil company...

... in wells, which are faced with near-wellbore damage. Minimizing formation damage in the near- wellbore region and thus ensuring proper well performance for enhanced productivity of the well also results in increased recovery factor. Formation damage caused by conventional overbalanced drilling (OBD) can...

... Abstract Underbalanced (UBD) operations are being utilized with increasing frequency as a means of reducing invasive formation damage, minimizing problems with differential sticking, lost circulation, and increasing rates of penetration in many drilling operations. Additional to the operational...

... pressure drilling separator formation damage drilling operation concentration equipment optimization enable safe underbalanced drilling scrubber modification Exhibition Injection Rate scavenger successful underbalanced drilling reservoir Saudi Arabia Drilling centrifuge tank h2s...

... Ding et al. 6 presented a numerical approach to modelling possible formation damage during UBD in homogenous reservoir. In their work, they used a two-phase flow model to describe invasive formation damage during UBD. To simulate temporary overbalanced time periods, the model developed for OBD...

..., and permanent formation damage) and their impact on production under a variety of reservoir conditions. Production rates are predicted for both UBD and OBD cases. Then, an incremental net present value (NPV) model has been used to analyze the economic benefits of UBD operations (if any) for all study cases...

... of getting stuck. Failure to get casing to bottom would result in a poor performing well as the highly damaged rock left open hole would be unproductive. Formation damage from the expected loss of 50,000 barrels of drilling fluid would require a fracture stimulation to regain productivity. To prevent...

... in porous media formation damage production control equation iadc spe 81639 viscosity correlation productivity prob inflow equation Introduction In recent times, however, with increasing evidence of the productivity improvement benefit of UBD, several operators are beginning to consider...

... benefits which can be categorized into two main sections, reservoir and operational. These include but are not limited to, Reservoir Minimizing formation damage Increased production rates (including maximizing flush production) Early evaluation of reservoir properties Operational...

.... If calibration has already been made and predictions agree with actual measurements there is more confidence in the model and the prediction that the system is underbalanced. Otherwise underbalanced conditions may not be guaranteed, and formation damage could occur. Field data from oil and gas wells are used...

... required to get beyond the formation damage caused by the invasion of the drilling fluid or cement invasion during completions. Stimulations are required to get beyond the formation damage by creating a permeable area between the wellbore and the undamaged reservoir. Stimulations are also used to create...

... safety, minimum rock formation damage, and wellbore stability. The expert uses a set of known facts and heuristics to measure the reservoir susceptibility for damage caused by clay swelling, fines migration, lost circulation and wellbore collapse. A knowledge base development tool (Resolver...