RU1770546C - Sealing block for upright wells - Google Patents

Abstract

The invention relates to the mining industry and can be used as a means of controlling the flooding of mines through drilled wells. The goal is to increase the reliability of the sealing tube due to V

Description

The invention relates to mining. mainly to underground coal mining. The goal is to increase the effectiveness of the fight against flooding of mine workings through boreholes while at the same time creating the possibility of the beneficial use of groundwater.

Various methods and devices are known for isolating boreholes from mine workings.

Thus, in application 1, a technical solution (method and device) is proposed that has already been tested in practice. However, the claimed device requires the mandatory implementation of the method and is not applicable without the latter. More versatile is the known 2 conductor cementation design of the annulus. With deep wells and a head of more than 30 m water column, the structure is unreliable, passes water into the production, which is explained by a violation of the sealing during drilling after installation of the conductor. The low location of the plug entails when the valve is closed, flooding the production through a system of cracks in a radius of 10-15 m around the well

The most reliable and closest in essence is the device, known as the hydromechanical plug DAU-2 3, installed in the right place of the well and guaranteeing its complete isolation.

The hydromechanical plug consists of a sealing rubber element and a shutter provided with a left-hand thread for connection to a drill string. The shutter is triggered by the npji supply of flushing fluid through the drill bit, pushes the rubber element until it is completely sealed and the latch actuates. When the rotation of the drill string is turned on, the shutter is disconnected and together. With the drill bit, the drill rod is removed from the well and the sealing element remains in the well and

acts as a cork.

The disadvantage of this device is the need to have a drilling rig in a mine, which requires a certain time and is not always acceptable from the point of view of the quickest elimination of water breakthrough from the well. In addition, the use of the DAU-2 device does not allow the beneficial use of groundwater.

In the proposed device, these drawbacks are eliminated by the separation of the installation operations of the sealing element and the shutter in the well, which makes it possible to dispense with the drilling rig. The sealing plug consists of a housing

connected to the pipe string and the gate (Fig. 1,2) This makes it possible to enclose groundwater in the pipes and transfer them to the desired distance for beneficial use or isolation. Moreover, as far as the actual pressure allows, water transfer is also possible upward, for example, to the upper horizons of the mine

The casing 1 of the sealing plug, corresponding to the diameter of the borehole, has a central axial channel, longitudinal slit-shaped slots 4 of variable width decreasing towards the ends (Fig. 1 a) and is equipped with segmented clamps 3, The slit-shaped slots allow reducing the outer diameter of the body of the sealing plug, and the ratio the largest and smallest outer diameters of the housing is defined by the following expression

Omin "0.5-0.8 Omax where Omin is the smallest case diameter, m;

Omzks - the largest diameter of the body, m,

A sealing element made of rubber 5 is installed on the body of the sealing plug, made in the middle part of the concave externally 1 / surface

Radial channels are arranged in the housing of the sealing plug at an angle of 45 ° to its axis to accommodate the pushers and are directed towards the movement of the shutter.

The pushers are rigidly connected to the latches, the shutter 2 has a conical head part.

The operation of the device is as follows.

After installing the casing string with a sealing plug in the right place in the well, a drill string with a shutter installed in its head is fed into the string. When the shutter moves upward, the walls of the sealing element are moved apart and thereby increase the outer diameter of the plug. The rubber layer 5 fills the free space between the walls of the well and the device, ensuring its sealing. Segment locks secure the plug in position. In this case, the pusher 4 during the movement of the shutter moves the segment 5 in the direction of the walls of the well (figure 2). Segment locks are located at different levels in pairs and provide the necessary clamping force. The latches can be 2,4,6, etc. Depending on the specific conditions,

The pusher is selected in such a section that deformation occurs when a load is reached that is close to critical for the material (rubber). To improve sealing of the end portion of the plug, the cylindrical portion of the closure is also provided with a thin rubber layer.

The manufacturing method of the described device has its own characteristics and can be illustrated by the description of the technology in the form of sequential interconnected operations.

1. As a workpiece for the manufacture of the sealing element take a piece of casing outer

diameter length exceeding the diameter of not less than 10 times.

2. Calculation, marking, and manufacture of slots are made with a carbide (diamond) saw.

The width of the slot h in their middle part with their number n is

h - (Omax Omin).

With a low purity of treatment, the value of h increases by 1-2 mm,

3. Prepare the nests for the clamps (marking, drilling at an angle of 45 °, stripping holes);

4. Compress the workpiece in a vise of a given diameter and fix this position with a paper cord that collapses upon ingress of moisture.

5. The end parts of the preform are cleaned and degreased and then coated with a layer of adhesive. 4. The middle third of the preform, where the fasteners are placed, is coated with a layer of silicone emulsion 5, which is a 0.5-2.5% solution of silicone oil in water.

6. Wrap the workpiece with crude rubber to obtain the nominal diameter, cover it with a layer of silicone emulsion and crimp it in a vice to a force of 0.25-0.30 MPa.

7. The rubber is vulcanized at a temperature of 140-145 for 20-30 minutes.

8. In the manufacture of the shutter, operations 5,6 and 7 are carried out on the middle (cylindrical) part of the workpiece, while the thickness of the rubber layer is 1.5-2 mm.

9. In order to increase the service life, the metal surfaces of the device and casing strings are cleaned, degreased and primed using well-known technology.

10. The housing of the sealing plug is connected to the casing string, and the shutter to the adapter to the drilling tool.

The device is ready to go. The sealing element and the shutter are supplied to the installation site in separate operations: first, the casing string is supplied with the sealing plug body in the head part, and then the shutter connected to the drill pipes is fed.

A drill rig is not required to carry out the described operations. Both operations can be carried out using small-scale mechanization tools available in any mine: hydraulic stands, hydraulic jacks. Of course, application is not excluded.

for these purposes and the drilling rig, the expected positive effect upon implementation of the described technological solution can be obtained by:

Preventing watering of mine workings through a borehole;

-preventing pollution of groundwater and turning them into mine water;

-useful use of groundwater, depending on its quality for technical or other purposes, while saving groundwater resources, achieved by shutting off the pipeline by a hydraulic valve at the wellhead if water is not required;

-short plug installation time, since a minimum of cargo prepared in advance at the mine is delivered to the site. The cork installation process itself takes 2-3 hours.

Claims (3)

SUMMARY OF THE INVENTION 1. A sealing plug for ascending wells, including a housing associated with a column of pipes with a central axial channel and longitudinal slit-shaped slots, a sealing element concentrically mounted on the housing and placed in the housing channel with the possibility of translational movement relative to it of a shutter, distinguishing so that, in order to increase by 0 the reliability of the sealing plug due to the possibility of reducing time and simplifying the technical means for conducting insulating works, as well as the beneficial use of groundwater, it is equipped with fixing elements and rigidly connected pushers, the shutter having a conical upper part, the housing is made with concave in the middle part of the outer surface and with radial channels for placement of pushers in them, while the latter are installed with the possibility of interaction with the shutter, and radial anal housing formed at the level of the longitudinal positioning of the slots, wherein the slots have a variable width umenshayuschuyus to the ends, and the ratio of maximum and minimum external diameters of the housing is defined by the following expression; DMKH 0.6-0.8 Ohmax, where Oming is the smallest case diameter, m; Omax - the largest diameter of the body, m. 2. A plug according to claim 1, characterized in that the locking elements are segmented. 3. A plug according to claim 1, characterized in that the radial channels of the housing are made at an angle of 45 ° to the axis directed towards the movement of the shutter. 5 0 5 Aa / g