RU27147U1 - OPERATION WELL BOTTOM DESIGN - Google Patents

Description

DESIGN OF THE BOTTOM OF THE LATERAL BORE OF THE OPERATING WELL1

The utility model relates to the field of mining, to devices for producing liquid media from drilled wells, namely, to devices for fixing wells and isolating formations.

Known designs of the faces of boreholes containing a complex of enclosing borehole rocks, consisting of an alternation of permeable oil-containing and impermeable formations and a normal casing string in their bore (N.G. Sereda, V.M. Muraviev. Fundamentals of oil and gas business. , M., Nedra, 1980, 287 p., Ill., P. 50-52.).

A disadvantage of the known devices is the presence of inter-reservoir annular flows of liquid media in the well.

This drawback was eliminated in the design of the bottom hole of the side well of a production well containing a complex of rocks containing a well, consisting of alternating permeable oil-containing and impermeable formations, and a casing string normal to their extension in a well with cementing cuffs, packers and filters (Utility Model Certificate No. 13909, MKI7: E 21 V 43/10, publ. 06/10/2000 Bull. No. 16 - prototype).

However, the known device, which we selected as a prototype for the majority of coinciding features, involves drilling the bottom of the formation while drilling, when the true occurrence of the layers is unknown, as a result of which part of the bottom extends beyond the reservoir.

The problem solved by the proposed utility model is to increase the productivity of previously drilled wells.

The technical solution of the utility model consists in the fact that in the well-known design of the bottom hole of the side well of the production well containing a complex of rocks containing the well, consisting of alternating permeable oil-containing and impermeable formations, and a casing pipe normal to their extension in the well with cementing cuffs, packers and filters, in the interval more useful power oil-containing reservoir in the wall of the column made a hole and

MKI7: E21V43 / 10

lateral borehole, overlapped by a collar smaller than the casing diameter, equipped with cementing cuffs, packers and filters.

The performance in the interval of useful power of the oil-containing formation in the wall of the casing and the side of the well bore, closed by a countersunk of a diameter smaller than that of the casing, equipped with cementing cuffs, packers and filters, ensures reliable opening and highly efficient operation of the occurring; it is higher than the bottom of the drilled well of the productive formation .

In FIG. graphic application depicts a longitudinal section of the inventive device.

The device consists of an enclosing well; its well 1 with production casing 2 fixed with cement mortar 3, a complex of rocks consisting of alternating permeable oil containing strata; their strata 4 and impermeable, for example, clay strata 5.

A hole 6 is made in the wall of the casing 2 and well 1 and a lateral bore 7 of the well is drilled, in which it is mixed; a secret 8 (less than the casing 2) diameter is smaller than the casing 2, equipped with a cementing sleeve 9, a packer 10 and filter 11

The proposed device operates as follows; by it.

Cementing cuff 9 restricts the flow of cement mortar 3 into the cavity of the sidetrack 7 of the well, held along the strike of the oil-containing formation 4, the coordinates of which are determined by geological and geophysical methods. The packer 10 serves to additionally fix the countersunk column 8 in the side barrel 7, and the filter 11 cleans the fluid from the mechanical impurities entering the cavity of the countersink 8 and then into the cavity of the production (casing) column 2.

Feasibility or other efficiency

1. Improving the productivity of previously drilled wells.

2. Reducing the number of idle wells ..

Claims (1)

The design of the bottom hole of the lateral well of a production well containing a complex of rocks containing the well, consisting of an alternation of permeable oil-containing and impermeable formations, and a casing pipe normal to their extension in the well with cementing cuffs, packers and filters, characterized in that in the range of useful oil-containing power the formation in the wall of the column is made a hole and a lateral wellbore, overlapped by a countersunk of a diameter smaller than that of a casing equipped with cement ovochnymi cuffs, packers and filters.