Lightened Fluid Hydraulics and Inclined Boreholes
- M.D. Rankin (Pool Co.) | T.J. Friesenhahn (Pool Co.) | W.R. Price (Pool Co.)
- Document ID
- Society of Petroleum Engineers
- SPE/IADC Drilling Conference, 28 February-3 March, New Orleans, Louisiana
- Publication Date
- Document Type
- Conference Paper
- 1989. SPE/IADC Drilling Conference
- 1.8 Formation Damage, 4.2 Pipelines, Flowlines and Risers, 4.1.2 Separation and Treating, 1.11 Drilling Fluids and Materials, 4.1.5 Processing Equipment, 1.10 Drilling Equipment, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.1 Drilling Operation Management, 1.11.5 Drilling Hydraulics, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.6 Drilling Operations, 5.3.2 Multiphase Flow, 2.4.5 Gravel pack design & evaluation, 2.4.3 Sand/Solids Control
- 0 in the last 30 days
- 129 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 8.50|
|SPE Non-Member Price:||USD 25.00|
This paper discusses the use of fluids with densities less than that of water as a circulating medium in horizontal wells. The significance of inclined geometry as a determinant of pressure loss and hole cleaning efficiency is discussed as are the results of laboratory simulations.
The use of horizontal wellbore geometry as a means of enhancing productivity of under-pressured or damaged formations (drainholes) or of maximizing exposure to vertical fracture systems (fracture intercepts) has become increasingly popular as an alternative to conventional stimulation or in-fill drilling. This technology has precipitated the development of a number of specialized tools and techniques which are designed to facilitate the high build rates necessary to achieve "horizontal" trajectories.
In either application (drainhole or intercept) it is reasonable to assume that close control of drilling fluid properties is essential. If the primary objective is to increase productivity relative to that of a vertical well, it would not make sense to incorporate a drilling fluid which detracts from the objective. As a result, many operators have turned to lightened fluids as a means of maximizing the productive potential of horizontal wells.
Conventional drilling programs include a mud with properties sufficient to control the influx of properties sufficient to control the influx of formation fluids (gas or liquid) into the wellbore. A normally pressured formation will be exactly balanced against a static column of fresh water (including seawater overburden in the case of offshore locations). Formation pressures greater than normal require the use of additives designed to increase the density of the fluid column to the degree necessary to eliminate the tendency of the formation to "kick". Circulating pressures in excess of formation pressure will result in loss of wellbore fluid to the formation via natural porosity/ permeability or through breakdown of the formation. permeability or through breakdown of the formation. Loss of drilling fluid to a productive formation often results in a detrimental change in near wellbore permeability (skin damage) impeding productivity (Craft and Hawkins). productivity (Craft and Hawkins). P. 439
|File Size||589 KB||Number of Pages||12|