RU2296853C2 - Drillable packer - Google Patents

Abstract

FIELD: oil production industry, particularly means to isolate one well bore section from another one in air-tight manner.

SUBSTANCE: packer comprises mandrel with outer thread, sealing member arranged on the mandrel, upper and lower cones, upper and lower gripping means connected to the cones and split nut located in upper cone. Upper cone is provided with thread mating mandrel thread and formed in inner surface thereof and with outer thread. Packer additionally has rest formed in lower mandrel part as plug or plug with case.

EFFECT: increased operational reliability, reduced costs and simplified technological works for packer installation.

2 dwg

Description

The invention relates to the oil industry and can be used for tight separation of one part of the wellbore from another.

Known drillable packer PR-1 (214), containing a housing, a rubber element, dies, a sleeve (Serenko I.A., Sidorov N.A., Koshelev A.T. Re-cementing during the construction and operation of wells. - M .: Nedra , 1988, Fig. 55, p. 200).

The disadvantage of this device is the low reliability, high cost and material costs when repairing a well.

Closest to the proposed technical solution is a drillable packer containing a hollow cylindrical barrel with a threaded thread on the outer surface, a sealing element mounted on the barrel, upper and lower cones, upper and lower grips that are connected to the cones, a split nut having a threaded barrel the inner surface (AS No. 1832148, E 21 B 33/12, dated January 23, 1990, published on August 7, 1993, prototype).

The disadvantage of this device is the low reliability, high cost due to the complexity of the design.

The drillable packer that we offer is devoid of the above disadvantages and allows us to simplify the technological work of installing the drillable packer; to simplify the technological work on the installation of cement bridges; reduce the time for drilling the proposed technical solution; ensure the safety of the installation of cement bridges under pressure; reduce pollution in the bottomhole formation zone.

The technical result is achieved by the fact that the proposed drillable packer contains a barrel with a threaded thread on the outer surface, a sealing element mounted on the barrel, an upper and lower cone, upper and lower grippers that are connected with the cones, a split nut installed in the upper cone, which has a threaded thread on the inner surface, and having a threaded thread of the barrel on the inner surface and a threaded thread of the cone on the outer surface, and is additionally equipped with a stop located nym in the bottom of the barrel. Moreover, the emphasis is a cork or cork with a housing.

Figure 1 shows a General view of the drilled packer in section with a stopper; figure 2 shows a General view of the drilled packer in section.

Drill packer contains a barrel 1 with a threaded thread on the outer surface and installed on the barrel 1, an elastic sealing element 2 in the form of several cuffs, the material of which may have different hardness, or in the form of a single cuff, an upper anchor and a lower anchor.

The barrel 1 is a cylindrical element, which may be hollow, for example a pipe (figure 2).

The lower anchor is a wedge mechanism, consisting of a lower cone 3 in the form of a conical sleeve and a lower grip 4, made in the form of an annular element with cuts that are interconnected. The lower cone 3 and the lower grip 4 can be interconnected by shear elements, for example screws (not shown).

The upper anchor differs from the lower anchor in that a threaded thread is made in the upper cone 6 on its inner surface and a split nut 7 is installed in it.

The split nut 7 is made in the form of an elastic split ring with a threaded thread on the inner and outer surfaces, which interacts with a similar thread made on the outer surface of the barrel 1 and the inner surface of the upper cone 6. Due to the fact that the split nut 7 has opposite - different threaded threads internal and external surfaces, this allows the upper anchor to move along the barrel 1 in only one axial direction downward, while providing compression and fixation of the elastic sealing 2nd element between anchors.

The lower anchor is pressed by an abutment 8 mounted on the barrel 1. An abutment 8 is a cork or cork with a body.

The device operates as follows.

The drilled packer is connected to the planting device by means of connecting shear elements (not shown) and in the transport position on the tubing string (hereinafter referred to as tubing string) (not shown) is lowered into the well to the required depth.

Upon reaching a predetermined depth inside the tubing string, pressure is created, as a result of which the elements of the landing device move upward, acting on the upper jaws 9. The upper armature together with the split nut 7 moves down the barrel 1, compressing the elastic sealing element 2 and acting on lower cone 3.

After that, the lower cone 3 is moved down, and since the propped upper anchor prevents the elastic sealing element 2 from moving up the barrel 1, the sealing element 2 is compressed, and the lower grips 4 are wedged between the lower cone 3 and the casing. Jamming of the lower jaws 4 occurs with the simultaneous packing of the sealing element 2.

In other words, the elastic sealing element 2, compressing between the upper, lower anchors 3 and 4 and deforming, is pressed against the casing wall, thereby creating a tight seal in the well.

When the critical design load is reached, the connecting elements (not shown) are cut and the landing device (not shown) is released from the packer. Drill packer remains in the well in a sealed and anchored state, which is accompanied by a drop in pressure, and the landing device is removed from the well.

Using the proposed technical solution makes it possible to increase the reliability of the drilled packer, to reduce pollution in the bottomhole formation zone, to reduce the cost and material costs when repairing the well, as well as to simplify the technological work on installing the drilled packer and cement bridges, reduce the time for drilling the proposed technical solution; ensure the safety of the installation of cement bridges.

Claims (1)

Drillable packer containing a barrel with a threaded thread on the outer surface, a sealing element mounted on the barrel, upper and lower cones, upper and lower grippers that are connected with the cones, a split nut having a threaded thread on the inner surface, characterized in that it additionally equipped with a stop located on the barrel in its lower part and representing a cork or cork with a housing, the upper cone has a threaded thread on the inner surface, and a split nut is installed in the upper m cone and has threading on an outer surface, a similar upper threaded cone.

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