Method for drilling directional wells

Details Method for drilling directional wells Method for drilling directional wells

1991-06-14

1993-07-27

Dang, Hoang C.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 61, 175 62, E21B 704

Patent

active

052303861

ABSTRACT:
A method for detecting and sensing boundaries between strata in a formation during directional drilling so that the drilling operation can be adjusted to maintain the drillstring within a selected stratum is presented. The method comprises the initial drilling of an offset well from which resistivity of the formation with depth is determined. This resistivity information is then modeled to provide a modeled log indicative of the response of a resistivity tool within a selected stratum in a substantially horizontal direction. A directional (e.g., horizontal) well is thereafter drilled wherein resistivity is logged in real time and compared to that of the modeled horizontal resistivity to determine the location of the drill string and thereby the borehole in the substantially horizontal stratum. From this, the direction of drilling can be corrected or adjusted so that the borehole is maintained within the desired stratum.

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Gianzero et al., "Induction, Resistivity, and MWD Tools in Horizontal Wells", May 1990, pp. 158-171.
Anderson et al., "Response of 2-MHz LWD Resistivity and Wireline Induction Tools in Dipping Beds and Laminated Formations", Jun. 1990, pp. 1-25.
Huang et al., "Computation of Induction Logs in Multiple-Layer Dipping Formation", IEEE Trans. on Geoscience and Remote Sensing, vol. 27, No. 3 (1989), pp. 259-267.

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