RU2291279C2 - Valve for well equipment (variants) - Google Patents

Abstract

FIELD: oil extractive industry.

SUBSTANCE: in accordance to first variant, valve contains body, locking element and rod with catching head, rigidly connected to locking element. In accordance to invention during extraction of oil from well, equipped with packer with shaft - hydraulic channel and locking element for closing this channel and shutting the well it is provided with container, mounted on locking element, in form of a barrel with open top, for collecting and accumulating mechanical admixtures, and perforated walls for flow of liquid. In accordance to second variant valve contains body and locking element. In accordance to invention during extraction of oil from well, equipped with packer with shaft - hydraulic channel and locking element for closure of this channel and stopping of well it is equipped with container, mounted on locking element, in form of barrel with open top, for collection and accumulation of mechanical admixtures, and perforated walls for passage of liquid. On internal side of container walls shelves and/or a recess are made.

EFFECT: prevented difficulties during replacement of well equipment.

2 cl, 3 dwg

Description

The invention relates to the oil industry, in particular to devices for temporarily or permanently blocking a wellbore (packer, bridge plug, shut-off valve, etc.).

A known valve for blocking the Central channel of a hydraulic packer, consisting of a locking element (E.I. Bukhalenko, V.V. Vershkova and other oilfield equipment, Handbook, M .: Nedra, 1990, p. 308).

The disadvantage of the valve is its lack of a fishing element, which does not allow it to be removed from the well. To open the bore of the packer barrel, the valve is pushed with excess pressure on the bottom of the well, which is unacceptable for wells with a horizontal bore.

A known valve for downhole equipment, including a locking element, a rod, a fishing head for catching the valve with a special tool, lowered from the wellhead (AS No. 561782, E 21 V 43/00 from 07.07.77, prototype).

The disadvantage of the above valve is that during the operation of the wells (injection, oil producing) sand accumulates above it, corrosion products, objects accidentally falling into the wellbore, for example, clamps of the power supply cable of the electric pump, etc., which complicates the lifting process (jamming occurs ) a valve and downhole equipment in which the valve is a component product. In addition, mechanical impurities fall under the valve shutoff element and prevent the tight shutoff of the hydraulic channels of the downhole equipment.

Our proposed valve for downhole equipment is devoid of the above drawbacks, in other words, it helps to prevent the valve from sticking in the wellbore when it is removed and mechanical impurities falling when it is closed under the shut-off element, and hermetically shut off the hydraulic channel of the packer.

This goal is achieved in that the valve comprises a housing, a shut-off element and a rod with a fishing head rigidly connected to the shut-off element, characterized in that when oil is extracted from a well equipped with a packer with a barrel — a hydraulic channel and a shut-off element for blocking this channel and killing the well , it is equipped with a container mounted on the locking element, in the form of a glass with an open top for collecting and accumulating mechanical impurities and perforated walls for fluid flow (Option 1).

According to the second variant, the valve comprises a body and a shutoff element, characterized in that when oil is extracted from a well equipped with a packer with a barrel — a hydraulic channel and a shutoff element for blocking this channel and killing the well, it is equipped with a container mounted on the shutoff element in the form of a glass with an open top for collecting and accumulating mechanical impurities and perforated walls for fluid flow, while on the inner side of the walls of the container protrusions and / or grooves are made.

Moreover, in the first and second embodiments of the valve, its body can be equipped with an annular sealing collar, which is fixed in the upper part from its outer side.

Figure 1 schematically shows a valve for downhole equipment in a set of equipment (Option 1), figure 2 shows an example of a valve for downhole equipment in a set of equipment to prevent infiltration of kill fluid into the reservoir, figure 3 schematically shows a valve for downhole equipment in set of equipment (Option 2).

Packer 2 was launched into well 1, a valve for downhole equipment (hereinafter referred to as a valve) was installed on the trunk 3 of packer 2, which closes the hydraulic channel of packer 2.

Option 1. The valve for downhole equipment contains a locking element 4, a rod 5, having in the upper part a fishing head 6 for capture by a special tool, lowered from the wellhead, container 7 (Fig.1, 2).

The rod 5 is rigidly connected to the locking element 4, which is a ball, or to the valve body 8.

The container 7 is installed on the shut-off element 4 with an open top, is made with perforated walls and is, for example, a glass, in the walls of which are openings of small diameter for the flow of produced fluid in the walls.

The container 7 is configured to install it on the locking element 4.

Option 2. The valve for downhole equipment includes a locking element 4 and a container 7.

The container 7 is mounted on the locking element 4 with an open top and is made with perforated walls, on the inner side of which there are protrusions 9 or / and a groove 10 (Fig. 3).

Option 1 differs from Option 2 by the presence of a rod 5 with a fishing head 6 and the absence of protrusions 9 or / and a groove 10 in the perforated walls.

In addition, for options 1 and 2, the container 7 may further comprise an annular sealing element 11, which is fixed in its upper part from the outside and is a self-sealing cuff that seals the container 7 relative to the wellbore 1.

The container 7 is intended for collection and accumulation of mechanical impurities entering the well, clamps for attaching the cable of the pump 12, for example, ESP, and smooth landing in the wellbore 1.

The device operates as follows.

Equipment (packer and valve) is lowered into the well and oil is extracted from well 1 by pump 12. To change pump 12, well 1 above equipment (packer and valve) is filled with a kill fluid. The locking element 4, for example a ball, blocks the hydraulic channel of the packer 2, preventing the passage of the kill fluid into the bottomhole zone 13 of the well 1.

When lifting and lowering pumping equipment and further operation of well 1, sedimentary mechanical impurity, objects, and corrosion products that accidentally fall into well 1 will accumulate in container 7 without falling into the zone of shutoff element 4.

In the process of carrying out major repairs in the bottom-hole zone 13 of the well 1, requiring the extraction of the packer 2, the rod 5 with the fishing head 6 at option 1 is captured by a special rope fishing tool from the wellhead 1 and the closure element 4 together with the container 7 is removed from the well 1, when this does not require additional operation to remove the container 7. Next, the packer 2 is removed and work is underway with the reservoir. Work in the bottom-hole zone 13 of the well 1 can be conducted through the barrel 3 of the packer 2 without removing the latter. Then only the valve for the downhole equipment is removed.

If the valve for the downhole equipment is designed according to option 2, the container 7 is removed without the packer 2 and the locking element 4. To do this, the container 7 is grasped from the wellhead 1 by the protrusions 9 by the protrusions 9 or by the groove 10, or by the protrusions 9 and by the groove 10 and is removed from the well 1, while work in the bottom-hole zone 13 of the well 1 is carried out without removing the packer 2, the locking element 4.

The proposed valve allows you to remove it together with the rod 5 with the fishing head 6 and, therefore, does not require additional operation to remove the container 7 before lifting the valve for downhole equipment, in addition, eliminates contact of the kill fluid with the reservoir of the bottom-hole zone 13 of the well 1. Thus , the productivity of well 1 is maintained during its current underground repair.

After the work carried out in the bottom-hole zone 13 of the well 1, the packer 2 is installed, if it was removed. From the wellhead 1, the proposed valve for downhole equipment is discharged before landing in the barrel 3 of the packer 2, the technical solution of which ensures its smooth free fall.

The essence of the invention lies in the fact that sand sedimenting in the wellbore 1, corrosion products, as well as objects accidentally falling into the wellbore 1 accumulate in the container 7, and do not silt (fill up) the downhole equipment, which prevents them from jamming in the wellbore 1 and valve non-closing during operation.

The proposed technical solution allows without complications to change the downhole equipment that is equipped with recoverable valves, guaranteed to ensure that the hydraulic channels of the equipment are blocked, in other words, prevents the penetration of mechanical impurities under the container 7.

Claims (4)

1. Valve for downhole equipment, comprising a housing, a shutoff element and a rod with a fishing head rigidly connected to the shutoff element, characterized in that when oil is extracted from a well equipped with a packer with a barrel — a hydraulic channel and a shutoff element for blocking this channel and killing the well It is equipped with a container mounted on a shut-off element in the form of a glass with an open top for collecting and accumulating mechanical impurities, and perforated walls for fluid flow. 2. The valve for downhole equipment according to claim 1, characterized in that the container is equipped with an annular sealing collar, which is fixed in the upper part from its outer side. 3. A valve for downhole equipment, comprising a body and a shutoff element, characterized in that when oil is extracted from a well equipped with a packer with a barrel — a hydraulic channel and a shutoff element for blocking this channel and killing the well, it is equipped with a container mounted on the shutoff element in in the form of a glass with an open top for the collection and accumulation of mechanical impurities, and perforated walls for the flow of fluid, while on the inner side of the walls of the container protrusions and / or grooves are made. 4. The valve for downhole equipment according to claim 3, characterized in that the container is equipped with an annular sealing collar, which is fixed in the upper part from its outer side.

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