#misplacedwellbore

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MODELLING THE ECONOMIC IMPACT OF SPACING UNCERTAINTY IN UNCONVENTIONAL LONG LATERALS DUE TO COMMON SURVEY PRACTICES

Finding an optimal lateral spacing is crucial to maximizing the return on investment for unconventional assets. The estimates regarding these lateral spacings were made for various plays; however, in a general sense, they assumed that the wellbores were precisely drilled and surveyed (Bharali et. al., 2014; Lalehrokh & Bouma, 2014).

Wellbore positions have potentially large uncertainties and recent studies demonstrate that these uncertainties are even larger than previously assumed (Love, et. al, 2020).This study combines the previous work completed on spacing uncertainty with a reservoir simulation model to better quantify the losses caused by positional uncertainty, while exploring the sensitivity of said losses in relation to the changing lateral length, well spacing and survey accuracy allowing for future optimal field development.

A previous method of simulating reservoir losses due to survey uncertainty, proposed by Maus & DeVerse (2016) and the major basins reservoir simulation using empirically derived positional uncertainty models generated by analyzing survey data from thousands of wells by Love et. Al., (2020) provided the framework for this study. The estimations for typical production losses due to survey uncertainty were produced from simulations and compared to similar simulations using industry standard error models.

In all cases, a baseline simulation was run, estimating production losses observed on historical wells alongside additional simulations to determine the sensitivity of losses on future wells against lateral length (5,000 - 15,000 ft), lateral spacing (220 - 880 ft) and employed survey management techniques.

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ENHANCED WELLBORE PLACEMENT ACCURACY USING GEOMAGNETIC IN-FIELD REFERENCING AND MULTI STATION CORRECTION

IFR models are computed from high-resolution satellite and aeromagnetic measurements of the geomagnetic field. A new constellation of low-orbiting satellites provides accurate specification of the long-wavelength geomagnetic field.

This information is complemented by local high-resolution airborne magnetic surveys. Once the natural geomagnetic field is accurately specified by IFR, magnetic interference from the drill string can be removed by the Multi-Station correction.

This paper highlights the benefits of IFR and MS corrections on specific examples from Texas and North Dakota.

Azimuth corrections of 1 degree lead to changes in wellbore position of 200 feet and more at TD. Improved specification of the strength and dip of the geomagnetic field further enables tighter quality control of MWD surveys. The improved accuracy of the IFR+MS technique is quantified in the new set of Operator Wellbore Survey Group (OWSG) tool code MWD+IFR+MS.

This tool code reduces ellipses of uncertainty by about 50%, thereby facilitating well planning and enabling closer spaced laterals and in-fill drilling.

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