Drain hole drilling

Details Drain hole drilling Drain hole drilling

1982-09-02

1984-03-13

Purser, Ernest R.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

166285, 166 50, E21B 7100

Patent

active

044361653

ABSTRACT:
A method for enhancing the recovery of liquid products from a wellbore having at least one laterally extending drain hole wellbore extending therefrom, wherein a portion of the primary wellbore near the drain hole wellbore and a portion of the drain hole wellbore itself are completely filled with a hardenable material and the hardened material is then re-drilled leaving an outer layer of hardened material to line the primary wellbore and part of the drain hole wellbore so that gas cannot prematurely cone into the primary wellbore, thereby enhancing liquid recovery by way of the unlined portion of the drain hole wellbore before any gas reaches the drain hole wellbore.

REFERENCES:
patent: 2079517 (1937-05-01), McQuiston
patent: 2193807 (1940-03-01), Dieterich
Ranney, Leo, The Petroleum Engineer, Jun. 1939, The First Horizontal Oil Well, pp. 25-30.

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