Downsized conventional drilling is the use of a fit-for-purpose rig to drill conventionally a well with a reduced casing scheme ending in 4 3/4″ or smaller open hole, possibly with a 3 1/2″ production liner. The potential for downsizing oil wells in some fields, with cost savings of up to 35% with no loss of … Downsized conventional drilling – Slim Hole Wells

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Most slim wells are drilled and completed with a down-sized conventional approach using completely conventional drilling rigs, or modified workover hoists, as this is the cheapest solution. The conventional rigs may be one or two sizes smaller than if the same well were full sized, and some of them will have a “Retrofit” package of … Rigs for Slim Hole Drilling

Wells drilled using slim hole techniques are reducing initial drilling costs. The technology to conduct effective petrophysical evaluation in slim wells is available. Thus, slim hole development wells should be considered for many projects. Wells in fields will not flow at the rates traditionally required to justify subsea producers and smaller production conduit may be … Completion technology for Slim hole wells

One of the applications of slim hole drilling technology is for low cost exploration and delineation wells. Slim wells from fixed rigs (land/jackup/swamp) can be drilled using the down-sized conventional or the continuous coring approach, but the testing procedures and tools are in principle similar. As with full sized wells, testing may be conducted in … Production testing – Slim Hole Wells

Schlumberger has a set of 2 3/4″ diameter tools offering all services for 4 1/8″ holes. These tools have ratings of 175°C (350°F) and 137 MPa (20 kpsi) or better. The efforts to reduce micro-scanners and formation testers to less than 3 1/2″ have met with some success. For holes down to 4 1/8″ a … Slim hole well wireline logging

All regular evaluation techniques such as wireline logging, MWD logging, mud logging, etc. may be used in slim wells. In addition on-site core evaluation is available commercially for continuously cored wells, this is covered in the overview. Mud logging is completely conventional for small wells. The only point of note is that the cost of … Evaluation of slim hole wells

A number of small MWDs and steering tools are available, mainly intended for the horizontal sidetrack market. There are a number of small gyros which were designed to be run through conventional drillpipe. Dip-meters can be used as surveying instruments. Alternatives to surveying for cost-effective wells For many cost-effective vertical wells, surveying the well to … Surveying Slim Hole Wells

Slimming down wells can have a substantial impact on the cost and size of wellheads, Xmas trees, and BOP stacks. As a rough guide the weight, size, and hence costs of these components is proportional to the square of the final hole size for a given well. When using the downsized conventional concept the use … Wellheads, Xmas trees and BOPs for Slim Hole Wells

As a well is downsized the collapse and internal pressure ratings of the surface and intermediate casing and liner string increase. Thus liners can be used further up the hole than with conventional hole sizes. This gives the downsized conventional approach to slim wells the capability to increase the diameter efficiency of wells. 1 Casing … Casing, liners and cementing for Slim Hole Wells