RU120463U1 - TWO CHANNEL WELL SEALER - Google Patents

Abstract

 A two-channel well sealant, including injection hoses, cranes, manometers, a water seal and brackets, characterized in that it is equipped with a catcher, and the water seal has a collapsible design, in which the sealing elements are rubber bushings that are bursting in the well with springs and pistons under the influence of water pressure.

Description

The utility model relates to safety measures during underground mining and can be used to measure gas pressure in an array of a gas-saturated coal seam or inject water to pre-wet the coal seam in order to reduce dust formation during mining.

A useful model is known, including a tip for supplying water, a cylinder, a pipe, a piston, sealing elements, spacer rings and a support cup (patent for utility model No. 114478, published March 27, 2012, bull. No. 9).

A disadvantage of the known model is that the well is sealed due to the diametrical expansion of the rubber bushings from their compression in the axial direction, as a result of which they are jammed in the well and after the water supply to the formation is stopped, the rubber bushings cannot return to their original position for extraction and remain in the well.

A useful model is known, taken as a prototype, containing two high-pressure rubber hoses placed coaxially in one another, the outer hose is used to seal the well, and the inner one is used to measure the gas pressure in the array and pump the working medium into it, manometers, a crane and an arm with an anchor (utility model patent No. 64283, published June 27, 2007, bull. No. 18).

A disadvantage of the known utility model is that the external hose is a self-expanding high-pressure rubber sleeve of the Taurus type, the production of which is currently discontinued. Hoses of another type can expand diametrically, but cannot withstand high pressure, as a result of which the device can be ejected from the well and injure service personnel, and their use is limited in pressure. The threat of device ejection from the well arises if the pressure of the pumping medium through the internal hose into the well exceeds the well sealing pressure, i.e. burst pressure of the external hose. The injection of the working medium into the well is carried out at high pressure: from 10 to 20 MPa, and hoses that have the ability to expand diametrically can withstand a pressure of not more than 5 MPa.

The technical result of the utility model is to increase the safety of staff due to reliable sealing of the device in the well and eliminating the possibility of its release at high pressure.

This is achieved by the fact that the two-channel well sealant, including injection hoses, taps, manometers, a water seal and brackets, is equipped with a catcher according to the utility model, and the water seal has a collapsible design, in which the sealing elements are rubber bushings that can be bursted in the well by springs and pistons under action of water pressure.

The essence of the utility model is illustrated by drawings, in which Fig. 1 shows a general view of a two-channel well sealant, in Fig. 2 - a water seal, in Fig. 3 - a section, in Fig. 4 - a catcher.

The two-channel well sealant consists of injection hoses 1 and 2, taps 3 and 4, pressure gauges 5 and 6, tees 7 and 8, water injection hose 9 for sealing the well, hose 10 for pumping the working fluid into the coal seam, a water seal 11, brackets 12, a catcher 13.

The water seal contains three threaded housings 14, three rubber bushings 15, a shank 16 and a tip 17. Each housing has three rows of threaded holes (three holes in each row located at 120 °) into which the bushings 18 with the pistons 19 installed in them are screwed . Between the housing 14 and the rubber sleeve 15 are springs 20. In the center of the hydraulic seal is a pipe 21, through which the working fluid is injected into the coal seam through the holes in the tip.

The catcher consists of a body 22 in the form of a pipe, at one end of which a trapezoidal thread is cut, and at the other there is an emphasis. Three rubber bushings 23 are installed on the body, between which there are spacer sleeves 24. On the threaded end of the body are a sleeve 25 with a flywheel 26, a freely rotating sleeve 27 with a rod 28 and a lock nut 29 with a flywheel 30. A pipe 31 with a tip 32 and a shank for connecting the pressure sleeve 33. To increase the compression force of the rubber bushings and increase the tightening torque of the locknut, there is a removable extension 34 that is worn on the handles of the flywheels 26 and 30.

Below is the principle of operation of the device.

Several wells are drilled to measure the gas pressure in the coal mass or to inject the working fluid into the coal seam in the production side. A catcher 13 is installed in one well 13. Rotating the flywheel 26 with the help of an extension cord 34 manually compresses the rubber bushings 23 in the axial direction, as a result of which they burst and securely fix the catcher in the well. A water shutter 11 is installed in a neighboring well and passed through a slot in the rotary rod 28, which is fixed (clamped) with a lock nut 29 and a flywheel 30. In case water is pumped into the formation through a trap 13, a pressure hose 33 connected to the pump is connected to the liner.

Then, brackets 12 are attached to the excavation soil using brackets 12 for mounting tees 7 and 8. Cranes 3 and 4 with discharge sleeves 1 and 2 are connected to the tees on the one hand, and pressure sleeves 9 and 10 are attached using quick disconnect couplings on the other hand. Pressure gauges 5 and 6 are also installed in the tees.

Initially, the well is sealed. To do this, from the shaft pump (not shown) along the sleeve 1, through the open valve 3, the tee 7, along the injection sleeve 9, water is supplied under high pressure into the channel A, from which it enters the internal cavity B of the valve body 11. Under the influence of water pressure the pistons 19 begin to move in the bushings 18 and press on the inner diameter of the springs 20, which are expanding diametrically, expanding the rubber bushings 15 in the well, sealing it. The sealing pressure is controlled by a pressure gauge 5.

After the well has been sealed, the valve 3 is closed and the valve 4 is opened. Water from the shaft pump (not shown) along the sleeve 2, through the open valve 4, the tee 8, along the injection sleeve 10 is supplied to the channel B under high pressure, from which it enters the inner cavity of the pipe 21 and is pumped into the well through a perforated tip 17. The water injection pressure is controlled by a pressure gauge 6. If the pressure of water injection into the well exceeds the burst pressure, the water seal will tend to jump out of the well. At the same time, he will press on the rotary rod of the catcher, creating a torque that will rotate the catcher in the well, creating additional force of its expansion in the well. Thus, the catcher will prevent the release of water trap from the well and ensure the safe operation of the sealant.

At the end of the operation, the valve 4 is closed, the sleeve 1 is disconnected from the pump and the valve 3 is opened to drain the water from the cavity B. In this case, the pistons 19, springs 20 and rubber bushings 15 will return to their original position. The water trap is freely removed from the well and installed in the next well, located next to the trap, and the cycle repeats.

When measuring gas pressure, water is injected into the reservoir to the pressure provided by the corresponding methodology for the operational measurement of gas pressure. The pressure gauge 6 determines the gas pressure in the coal seam array.

When using a sealant for hydraulic treatment of the formation, the required amount of liquid is pumped into the well, according to the relevant regulatory document, through the pipe 21 under pressure, which is required to achieve the goal of the preventive measure.

When using a sealant for pumping mine methane, the internal channel is connected to the gas suction unit using a sleeve 2 and the coal seam is preliminary degassed according to the developed degassing measures.

In the case of using a sealant for pumping the solution, the sleeve 2 is connected to the mortar pump.

As you can see, the device is multifunctional, it can be used to seal a well, measure the gas pressure in the formation before and after preliminary degassing, pump fluid to moisten the formation and pump out methane, and also supply a solution.

The two-channel well sealant is a reusable device; it is easily and quickly installed and disassembled, ensures the safety of maintenance personnel, and is simple and reliable during operation.

Claims (1)

A two-channel well sealant, including injection hoses, cranes, manometers, a water seal and brackets, characterized in that it is equipped with a catcher, and the water seal has a collapsible design, in which the sealing elements are rubber bushings that can be bursted in the well by springs and pistons under the influence of water pressure.