SU909109A1 - Apparatus for opening-up a production formation - Google Patents

Description

L) DEVICE FOR OPENING PRODUCTIVE The invention relates to the drilling of oil and hydrogeological wells, and can be used in the opening of the reservoir. Methods are known for opening the reservoir by drilling a pilot well to determine the interval of occurrence, as well as the mechanical and filtration properties of the rock that weaken the reservoir, and subsequently expanding the pilot well in the interval of the reservoir with flushing the well with a liquid agent (for example, water, oil, supplied from the surface through the drill pipe or the annulus 17. However, these methods are not sufficiently effective because the liquid agent supplied from the surface partially enters the formation, clogging it cuttings are known. There are known devices for opening a productive formation by drilling with a decrease in hydrostatic pressure on

PLASTIC SQUAEIN SURFACE by using a packer uncoupling the annular space of well 2. However, these devices and methods do not provide a drilling process using an expander on the approach to the productive formation and when the device is inserted into the roof of the reservoir, since the flow of the reservoir agent enters the drill pipe not falling on the face, destroyed by the expander. It is also known a device for opening the productive formation, comprising a housing with an axial channel and flushing windows, a packer and a sliding sleeve mounted for movement in the axial channel of the housing of the GB. This device allows the expansion of the well by breaking walls and removing the products of destruction by the flow of the formation agent. However, it does not allow expansion of the well in the pro / 3909

low-power duct seams and folded hard rock.

The purpose of the invention is to provide an opening of a low-capacity productive formation folded by strong rocks, with a local flushing of a formation; fluid.

This goal is achieved by the fact that the device is equipped with an expander installed in the lower part of the housing, and a hollow distribution rod with a rigidly connected upper part with a sliding bushing, and the housing is made with a cylindrical chamber located above the washing windows and communicating with the axial channel, and the diameter of the cylindrical chamber the outer diameter of the sliding sleeve is larger, and the distribution rod channel is blocked in the lower suit with a valve.

FIG. 1 shows a device for drilling a pilot well in a reservoir; in fig. 2 - device when embedded in the roof; in FIG. 3, the same, when reaching the bottom of the formation.

The device comprises a housing 1 with an axial channel 2 mounted on the drill pipe 3 by means of a screw connection. The packer i is attached to the housing 1 to close the annulus of the well and the roller extender 5. The axial channel 2 communicates with the annular space through the flushing windows of the bis space inside the drill pipe through chamber 7. In the axial channel 2 the sliding part 8 is moved, having a diameter smaller than the diameter of the chamber 7, which is connected with the distribution rod 9 and the sleeve 10 is rigidly fixed, closing the gap between the device body 1 and the rod 9. In the distribution rod 9 there is an axial channel blocked by valve 11.

An autopsy is performed in the next sequence.

The interval of the bedding, the mechanical and filtration properties of the rock composing the bed are determined by drilling the pilot pilot hole with core sampling (Fig. 1) by one of the known devices containing a hammering projectile and an expander launched into the well on the drill pipes.

Before releasing the device into the well, the distribution rod 9 is set to its lowest position.

When setting the expander 5 on the bottom of the distribution rod lower end goes into the pilot well. Then, lowering the hydrostatic pressure in the in-line space (for example, an airlift) causes an inflow to the well bottom of the formation agent, while the packer 4 prevents the flushing agent from entering the well bottom from the wellbore. Further drilling is carried out with flushing by the reservoir agent by pumping it with erlium or by using excess reservoir distance. The fluid flow from the reservoir enters the gap between the distribution rod 9 and the pilot borehole walls, then it washes the cone elements 5 and, capturing the sludge formed during drilling, carries it through the annular space between the device case 1 and the borehole walls through the flushing windows 6 into internal space and further to the surface.

Claims (3)

As the well expands in the formation interval, the distribution rod reaches the bottom of the pilot well and rests against it. In this case, valve 11 is destroyed and part of the fluid flow from the plast is directed to the bottom of the pilot well and then along the axial channels of the distributor rod 9 and the device body 1 into the inner tube space. Further recessing causes the displacement rod 9 and the sliding sleeve associated with it to move up the axial channel in the device housing. When this occurs, the flushing windows 6 gradually overlap, up to full switching, when the roller cone reaches the bottom of the formation, the flow of fluid from the formation to the direction of the pilot borehole and further along the drill pipes to the surface. This ensures the normal operation of the expander .5 and the optimal mode of removal of cuttings formed during drilling, regardless of the position of the expander relative to the reservoir being drilled. Further, the bottom hole leads to the displacement of the sliding sleeve 8 into the chamber 7, and the access of the reservoir agent through the flushing openings again opens into the inner tube space, which allows the formation to be tested without the use of additional devices. The proposed device for opening the reservoir compared to the existing ones allows opening the productive layers of low power composed of hard rocks with local well flushing with a stream of liquid agent coming from the plate, which contributes to the effective removal of sludge from the well and preservation of the natural permeability of the reservoir. The invention The device for opening the productive formation, comprising a housing with an axial channel and flushing windows, a packer and a sliding sleeve installed with the possibility of movement in the axial channel of the housing, so that In order to open the low-capacity productive formation folded by strong rocks, with local flushing with formation fluid, it is equipped with an expander mounted in the lower part of the body and with a hollow distribution rod rigidly connected to the upper part with a sliding sleeve. And the housing is formed with a cylindrical chamber, situated above washing windows and communicating with the axial channel, the diameter of the cylindrical chamber larger than the outer diameter of the sliding sleeve, and the distributor channel is blocked by the rod at the bottom of the valve. Sources of information taken into account in the examination 1.Onbirienko MG Drilling and equipment of hydrogeological wells. M., Nedra, 1978, p. 73-76. 2. Yasashin A.M. Autopsy, testing and reservoir testing. M., Nedra, 1979, p. 30-32. 3. Handbook for drilling water wells. M., Nedra, 1979, p.509510, (prototype).