SU1010252A1 - Method of consolidating complicated zones of a well - Google Patents

Abstract

THE METHOD OF FIXING COMPLEXED WELL ZONES, including the main column descent, its cementing, the lowering of the columns, their installation in the zone of complications and the subsequent cementing of the small columns, with the aim of reducing the time needed to fix the well and the possibility of maintaining it nominal cross-section over the entire depth, the column columns are fixed one below the other on the lower part of the main column, and their descent is carried out simultaneously with the main column, and the installation of the column chambers is carried out by atelnogo their detachment from the main column and a tolerance zone oslozh§ Neny. W with

Description

to eat yu

The invention relates to the drilling of wells, in particular, to methods of their fastening.

There is a known method of securing wells, including inclusions, and the descent of a casing string to a set depth, followed by its cementing Ql.

The disadvantage of the method is that the opening of the zones of complications below the casing shoe can be a cause of considerable time and money to eliminate them.

The closest to the invention is the method of fastening complicated zones of wells, including the descent of the main column, its cementing, the descent of the column-volatiles, their installation into the zones of complication and the subsequent cementing of the column-volatiles C23.

The disadvantages of this method are the long descent of the column, tube-fly, as well as the inevitability of the loss of the cross-section of the well in the interval of installation of the column-fly.

The purpose of the invention; is to reduce the time required to mount the well and the ability to maintain its nominal cross-section throughout the depth

The goal is achieved in that according to the method of fastening, the complicated areas of the wells, including the descent of the main column, its cementing, the descent of the column-voltages, their installation in the zones of complication and the subsequent cementing of the column-voltages, fix them one below the other on the lower part of the main column, Moreover, their descent is carried out simultaneously with the main column, and the installation of the column-volatiles is carried out by sequential disconnection. nor them from the main column and tolerance in the zones of complications.

FIG. 1 shows a well, npo-i is drilled up to the top of the first complicated zone (gas-saturated formation), three sections of casing are lowered and the upper section is cemented by the reverse method in FIG. 2 - the well, which opened the upper gas-saturated formation, two sections were lowered into the extended stem on the drilling tool, from the middle section (upper bat column) cemented; in fig. 3 - well, which opened the second complicated - zone (absorption of drilling mud), the lower section of the casing (the second column-fly) was lowered into the extended well on the drilling tool and cemented against the second complicated zone.

The drawing shows the upper section 1 of casing, the middle section 2 of casing (upper casing), the lower section 3 of casing (lower casing), the barrel

4 wells to be expanded; a device 5 for joining sections and dismembering them with a drilling collar ./ together with a sealing 1M cuff or inflatable packer, a drilling tool b with a device for attaching it to the flying columns, a separating plug 7 for cementing. the upper gut string, the jig 8, the annular space 9 is cemented, the open non-cased part 10 of the wellbore, the upper complication zone 11 (gas-saturated formation), the lower complication zone 12 (absorption of the mud), the wellbore 13 below the complication zone.

An effective technical means for separating the column of volatiles from a power column — when attaching wells — can be a known device, which consists, for example, of a typical casing liner in combination with a known device for cementing liners, allowing the column to be detached. pull down to the required depth and cement it.

For this, the flip-flop can be provided, for example, with a sleeve with a central hole and a ball seat fixed in the housing against the flushing windows with a shear element that moves downward when the central hole is blocked by the ball under the action of flushing fluid, opening the flushing windows.

After cementing the carrier column, the borehole is expanded with expanders depending on the diameter of the column.

The method is carried out as follows.

After descending the main column and the column-flyers and opening the zones of stay on the pipes, they release the disconnecting device. They ensure the coupling of the pipe with the bat column and the latter is disconnected in the place of its connector either with the same bat column or with the main column. Then the column is lowered into the zone of the complicated section of the well, flushed and. cementing, for example, according to technology adopted for cementing liners.

the use of the proposed sprasob will significantly reduce the consumption of casing and cement for fastening deep oil and gas wells, as well as increase the rate of their deepening in the lower intervals.

Economy of pipes and cement is achieved due to not continuous as usual, but partial fixing of only necessary intervals of wells and. the reduction of the string of the obsadndas of pipes used to fasten their upper intervals.

The increase in the rate of deepening the lower intervals of the wells is achieved

by maintaining their final diameter sufficient to bring the required power to the bit and to provide optimal conditions for the destruction of rocks at the bottom.

ten

.З

Claims (1)

. METHOD FOR FASTENING COMPLICATED WELL ZONES, including lowering the main column, cementing it, lowering the flying columns, installing them in the complication zone and subsequent cementing the flying columns, characterized in that, in order to reduce the time required to fix the well and the possibility of maintaining it nominal cross-section throughout the depth, the flying columns are fixed one below the other on the lower part of the main column, moreover, they are lowered simultaneously with the main column, and the installation of the Columnlets is carried out by sequentially their disconnection from the main column and admission to the complication zone. . $