Method of opening of waterbearing stratum in unstable rocks by upward borehole and device for its implementation

FIELD: oil-and-gas production.

SUBSTANCE: providing of stability of well walls, process controllability of opening of waterbearing formation of operation of two waterbearing formations of one upward drain borehole has become possible ensured by creation of backpressure in annular space of well during all time of its drilling in incompetent rocks and also usage in particular case in the capacity of intermediate string of filtering pipe string. Device for opening of waterbearing stratums in incompetent rocks by upward drain borehole includes drilling rig, rotator, main mud pump, drilling assembly, intermediate string, filtering pipe string and equipment of wellhead, containing conductor, wellhead mandrel, pipes grab, gland, closing sleeve, outlet and shutter. Intermediate string is outfitted by ring, rigidly installed to it at bottom end with ability of installation of sealing ring for overlapping of annular gap between conductor and intermediate string. Device is outfitted by additional boring pump, connected to outlet of wellhead mandrel, and also by nozzle installed at outlet of this branch diametre of which depends on static level of waterbearing formations at wellhead and rotary crane for passing of water into outlet from additional drilling pump.

EFFECT: providing of ability of additional water removing.

3 cl, 4 dwg, 2 ex

 

The invention relates to the field of mining and can be used for the construction itself drainage wells on two or more of the aquifer in unstable rocks in the construction of systems of mine protection from flooding, provide additional water withdrawals.

From the technical level there is a method of opening aquifer presents flooded Sands and sand-gravel rocks, rising drainage wells during construction of dewatering systems at mining enterprises and device for its implementation.

The known method provides for the drilling of the filter casing with a packer and packer pipes with a straight flush on the first aquifer with a free unregulated release from the well of sand and water from the aquifer, landing in the first aquifer filter columns with packer and packer pipe to a depth of 4-5 m), retrieval of the packer and the packer pipe and subsequent operation of the well.

The device structure itself well includes drilling machine for drilling, raise boring of wells, conductor, equipment, wellhead, the filter column with packer and packer and tubing (Eppisodes and other Equipment and technology of the drainage wells from underground mine workings. "Spravochnik drainage rocks". M: "Nedra", 1984, pp. 411-416).

The disadvantages of this method of opening the aquifer and device for its implementation are the high accident rate in the construction itself drainage wells, unmanaged sand and sand and gravel layers of the aquifer and the high probability of filling the excavation of sand and gravel rock and uncontrollable process of opening an aquifer, a small planting depth filter columns in the aquifer. Therefore, the performance of the wells from the aquifer varies within very wide limits. Filter column overlaps the small capacity of the first aquifer, the possibility of opening two aquifers.

The closest to the essential features of the claimed method and apparatus is a method of tapping aquifers in unstable rocks rising drainage borehole drilling rig UDB-8. The rig UDB-8 includes a drilling rig, mud pump, rotator, drilling string, an intermediate string of pipe, the filter string of pipe and equipment wellhead containing the conductor, the wellhead housing, the pick-up tubes, gland, gland, outlet valve and the valve. For the construction itself drainage wells mouth is avleat in the camera rig. Sabouraud well under the jig, set the jig and cement it to the conductor securing the wellhead equipment, drill hole drill to the first aquifer, Buryats intermediate column pipe in the first aquifer at shallow depths, drill filter column pipe and open the second aquifer (Timoshkov I.A., Belyakov, S. and others Experience building itself wells in China. Materials of the 2nd international Symposium "Development of deposits of mineral resources and underground construction in complicated hydrogeological conditions". Belgorod, VIOGEM, 1993, s-139).

The disadvantage of the prototype is unmanaged drilling in unstable rock aquifers, the high accident rate during drilling, a large variation in the productivity of wells.

The objective of the invention is the creation of a managed way of opening aquifers, providing the possibility of drilling itself drainage wells on two or more aquifers in unstable ground, and device for its implementation.

Technical results that may be obtained when implementing the claimed invention, are:

- Ensuring the sustainability of the walls of the borehole;

- Adjustable sand, sand and gravel rocks and the other is their unstable rocks of the aquifer;

- Ensuring the controllability of the process of opening the aquifer;

- Providing the possibility of opening two or more aquifers;

- Ensuring operation of two aquifers, one of the rebels drain well.

The solution of the stated problem and achieve the above results became possible due to the fact that in the known method of opening aquifers in unstable rocks rising drainage borehole, including the installation of the main mud pump, drilling rig, drilling itself well under the guard flange, the cementing of the conductor, the mounting flange of the conductor pick-up pipe and the wellhead housing with o-ring, a packing sleeve, bypass pipe and valve, drilling itself well drill before the first aquifer, leaving the jumper and removing the drilling of the intermediate column pipe, drilling filter column pipe having a smaller diameter than the diameter of the intermediate pipe string, and extracting from it the packer and packer pipe mount additional mud pump and connect it to the idler pipe casing wellhead, after removing the drill set at the entrance of the inlet nozzle, the diameter of which is calculated according to the t of the static level of the aquifers at the wellhead, additional drilling pump continuously served the flush fluid to create pressure between the borehole wall and the intermediate or filter columns of pipes above the reservoir, with additional drilling, the pump runs continuously while drilling these columns, pipes, and the main include only during the process of destruction of rocks, after drilling the intermediate column pipe and landing her up to the roof of the first aquifer overlap the annular space between the conductor and this column by filing a sealing ring ring rigidly mounted on the lower end of the intermediate column pipe, and after drilling the filter column pipes it is fixed to the flange of the push sleeve, attached to it the valve, close the valve on otodrom inlet and disassemble the nozzle, and also due to the fact that the known device for opening aquifers in unstable rocks rising drainage well comprising drilling machine, rotator, the main mud pump, drilling string, an intermediate string of pipe, the filter string of pipe and equipment wellhead containing the conductor, the wellhead housing, the pick-up tubes, gland, gland, outlet valve and the valve, intermediate column pipe is equipped with a ring rigidly established the its lower end with the installation of the sealing ring to overlap the annular gap between the conductor and intermediate column pipe, the device is equipped with additional drilling pump connected with a branch pipe to the wellhead housing, and a nozzle installed at the outlet of the nozzle, the diameter of which depends on the aggregate level of aquifers, wellhead, and crane swivel for the passage of water in the outlet pipe from additional drilling pump. In the particular example of the use of the method in the construction itself drainage wells in the first aquifer for the production of water as an intermediate pipe string, use the filter string of pipe.

Inventive step is the creation at the opening of the aquifer back pressure in the annular space in aquifers above the static level of the aquifers, which allows you to create stability of the borehole walls, to provide a managed process of drilling into aquifers, the possibility of drilling on two of the aquifer, the possibility of overlapping the annular space between the conductor and the intermediate column. The possibility of operating two aquifers, one of the rebels drainage hole is provided the use as an intermediate column pipe filter pipe string.

The claimed invention is illustrated by the following figures:

Figure 1. Shows the company is mounting a drilling machine, drill and equipment wellhead in the chamber, the conductor, the pick-up pipe, casing wellhead, valve.

Figure 2. Shows the equipment wellhead: the conductor, the pick-up tubes, the wellhead housing, o-ring, gasket, push bushing, outlet valve, crane swivel, valve, nozzle body and the nozzle.

Figure 3. Shows intermediate column pipe: a forming tool in the form of a roller bit, a sub with a check valve, subs, pipe, pipe with welded ring.

Figure 4. Shows the filter column pipes: sub, packer tube left-handed, packer pipe, couplings, filter, swell, short pipe, tube, flange.

Device for opening aquifers in unstable rocks rising drainage wells involves drilling machine 1 (Fig 1), which is installed in the chamber of mines (Fig. not shown). This camera is installed the main mud pump (Fig. not shown) and additional mud pump (Fig. not shown). The device includes a drilling string 2 (figure 1), consisting of drill pipe with the rock cutting tool (Fig. not shown), equipment wellhead (figure 2), an intermediate column pipe (figure 3) and the filter string of pipe (figure 4).

Equipment wellhead (figure 2) includes the conductor 3, the pickup TRUB, case 5 wellhead, valve 6, the sealing ring 7, the seal 8, the gland 9, the outlet valve 10, which is fixed to the rotary valve 11. The valve 6 is attached to the body 12 of the nozzle with a nozzle 13, the diameter of which is calculated depending on the static pressure of the aquifers at the wellhead to ensure that the pressure in the annular space of the well above the static head of the aquifers at the wellhead.

Intermediate column pipe (figure 3) includes the rock cutting tool 14 in the form of a roller bit, a sub with a check valve 15, sub 16, pipe 17, the lower pipe 17 welded to the ring 18, which is designed for lifting the sealing ring 7 to overlap the annular gap between the conductor 3 and the intermediate column pipe after landing her to a predetermined depth, sub 19 for connecting the intermediate column with shaft rotator (Fig. not shown) of the drilling machine 1.

Filter column pipes (figure 4) consists of a sub 20, packer pipe 21 with the left thread, couplings 22, filter 23, packer pipe 24 with right-hand thread short pipe 25, the packer 26, pipe 27, 28 sub for connecting the filter column with shaft rotator drilling machine 1, the flange 29.

The claimed method of construction of the rising drainage wells is as follows. The camera gornovyemochnyh mounted drilling rig 1, the main mud pump (Fig. not shown) and additional mud pump (Fig. not shown). Sabouraud the well to a depth of 4-5 m At the depth set the conductor 3 with the flange (Fig. not shown), and cement the annular space. To the flange of the conductor 3 is fixed to the housing 5 wellhead with a latch 6 on otodrom the pipe 10, the push sleeve 9 and the seal 8. Then well send the drilling string 2 and drill until the first of the aquifer, leaving the jumper (Fig. not shown). After removing the drilling Assembly 2 into the well send intermediate column pipe (figure 3) with the rock cutting tool 14 in the form of a roller bit. The valve 6 outlet pipe 10 is fixed to the nozzle body 12. In the case of the nozzle insert 12 nozzle 13. Further drilling is carried out using primary and secondary drilling pumps. Additional drilling pump through a rotary valve 11 serves washing fluid in the outlet pipe 10 to create a back pressure above the reservoir in the annular space between the borehole wall and the intermediate or filter columns of tubes. Additional drilling pump runs continuously, the main mud pump is only in the process of destruction of the breed. At a given depth, the drilling of the intermediate column pipe end, the annular space between conduct the ROM 3 and the intermediate column pipe cover o-ring 7 by means of its feed ring 18, mud pumps off, the intermediate column pipe attach the pickup tubes 4.

Then well send the filter column pipes (Fig 4), sub 20 filter pipe string connected to the sub with a check valve 15 intermediate the pipe string. At slow rotation filter the tubing is disconnected sub 15 with a check valve and rock cutting tool 14 in the form of a roller bit.

Drilling filter column pipes carried out in continuous operation for more mud pump that allows you to create a back pressure in the annular space of the borehole when the drilling of the aquifer. At a given depth drilling filter column pipe end. The filter string of pipe is fixed to the push sleeve 9. To the flange 29 of the filter column of pipes attached to the valve 6. Close the valve 6 on otodrom the pipe 10, disassemble the nozzle body 12 and the nozzle 13. In the filter column pipes send drilling string 2, which retrieve the packer 26, packer pipe 21, packer pipe 24. Perform operations on pumping wells and begin its operation.

Example 1. Prototype

At the mining enterprises KMA drilled more than 20 rebels drainage wells on two of the aquifer. The first aquifer lies at a depth of 60-70 m, second vodonos the th horizon at a depth of 80-90 m was Used drilling rig UDB-8-01, the main mud pump NB 160/6,3, wellhead equipment, intermediate column pipe with a diameter of 114 mm and filter column pipes with a diameter of 89 mm, packer and packer pipes.

The conductor of pipes with a diameter of 146 mm installed to a depth of 3-5 m, it installed the pickup pipe and wellhead equipment. To a depth of 55 m of drilling was carried out drill with a diameter of 89 mm with roller cone bits with a diameter of 132 mm, with a depth of 55 m to 65 m intermediate casing pipes with a diameter of 114 mm with roller cone bits with a diameter of 132 mm, with a depth of 65 m to 85 m filter column pipes with a diameter of 89 mm with roller cone bits with a diameter of 132 mm intermediate column pipe fastened with pick-up tubes, filter column pipe was attached to the push sleeve.

The drilling process in aquifers passed with great difficulty. Sharply increased torque on the columns of the pipes, clamps them, well the fact of the large amount of sand. Were well emergency, noted a large variation in the performance of drainage wells.

Example 2

For the mining company developed the project of opening two aquifers rising drainage wells.

The drilling itself drainage wells produce from cameras at the zero horizon drilling installation is th UDB-8-01, equipped with primary and secondary drilling pumps NB 160/6,3.

In the geological section through a well presented first layer of ferruginous quartzites, slates, plagiogranites, magnetites weathering crust of group VIII soils of drillability, group I soils for stability with a capacity of 50 m; the second layer of Sands of different grain size kolonizirovannykh with interlayers of clays and sandstones of group III soils of drillability, group II soil resistance capacity of 15 m; the third layer of arenaceous clays with interbedded clayey Sands, siltstones, Sandstone, quartz sand group III soils of drillability, group II soil resistance capacity of 30 m; the fourth layer of sand of different grain size, silt, pebbles, very rarely clay III groups of soils of drillability, group II soil resistance capacity of 5 m, the Second and the fifth layer of sand treated as two aquifer pressures on the estuary of up to 100 meters

For sinking wells to the design elevation accept trehkolonnom design of wells. All vertical wells.

The conductor of pipes with a diameter of 168 mm, set at a depth of 5 m, an intermediate string of pipe with a diameter of 114 mm to a depth of 65 m, the filter string of pipe with a diameter of 89 mm to a depth of 100 meters, Annulus between the pipes with a diameter of 168 mm and the walls of the borehole with a diameter of 215 mm are cemented. Drilling vertical the existing drainage wells to a depth of 5 m carry roller bits 215 mm, to a depth of 45 - cone drill with a diameter of 146 mm, to a depth of 100 m - cone bits 132 mm

Drilling of the intermediate column pipe from a depth of 45 m to 65 m and the filter casing pipes from a depth of 65 m to 100 m is carried out by providing pressure washing fluid at the wellhead 1.1 MPa. For the received power at the mouth of the wells and the performance of additional pump, equal to 160 l/min, the diameter of the nozzle are equal according to the calculation of 8.6 mm

As can be seen from example 2, the stated set of essential features of the invention allows to achieve the desired goal, namely to create a manageable way of opening the aquifer that provides the possibility of drilling itself drainage wells on two or more aquifers by creating back pressure above reservoir pressure in the annular space schweini during the whole time of drilling in unstable ground, provide a flow of washing fluid in the outlet valve additional drilling pump and release utopische mixture is adjusted through the nozzle. While planting depth filter pipe string reaches the target depth.

1. Method of tapping aquifers in unstable rocks rising drainage borehole, including the installation of the main mud pump, drilling rig, drilling itself with the vazhiny under the guard with flange the cementing of the conductor, the mounting flange of the conductor pick-up pipe and casing wellhead with a gasket, a packing sleeve, bypass pipe and valve, drilling itself well drill before the first aquifer, leaving the jumper and removing the drilling of the intermediate column pipe, drilling filter column pipe having a smaller diameter than the diameter of the intermediate pipe string, and extract from it the packer and packer tube, characterized in that the mount additional mud pump and connect it to the idler pipe casing wellhead, after removing the drill set at the exit of the nozzle the nozzle, the diameter of which is count depending on the static level of the aquifers at the wellhead, additional drilling pump continuously served the flush fluid to create pressure between the borehole wall and the intermediate or filter casing pipe above the reservoir, with additional drilling, the pump runs continuously while drilling these columns, pipes, and the main include only during rock breaking, after drilling the intermediate column pipe and landing her up to the roof of the first aquifer overlap the annular space between the conductor and this is alonei by filing o-ring ring, rigidly mounted on the lower end of the intermediate column pipe, and after drilling the filter column pipes it is fixed to the flange of the push sleeve attached thereto a latch, and fix the latch on otodrom inlet and disassemble the nozzle.

2. The method according to claim 1, characterized in that in the construction itself drainage wells in the first aquifer as an intermediate pipe string, use the filter string of pipe.

3. Device for opening aquifers in unstable rocks rising drainage well comprising drilling machine, rotator, the main mud pump, drilling string, an intermediate string of pipe, the filter string of pipe and equipment wellhead containing the conductor, the wellhead housing, the pick-up tubes, gland, gland, outlet valve and the valve, characterized in that the intermediate column pipe is equipped with a ring rigidly mounted on its bottom end with the installation of the sealing ring to overlap the annular gap between the conductor and the intermediate column pipe, the device is equipped with additional drilling pump connected with a branch pipe the wellhead, and a nozzle installed at the outlet of the nozzle, the diameter of which depends on the static level of the aquifers in the Thiey well, and crane swivel for the passage of water in the outlet pipe from additional drilling pump.



 

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FIELD: construction.

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10 cl, 2 dwg, 1 ex

FIELD: mining; construction.

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where Vmec - mechanical drilling speed, m/min, Fr - friction forces against rotation, Ften - friction forces against linear displacement, R - casing column radius, m, α - angle between vectors of directions of linear and rotating movements.

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FIELD: oil-and-gas production.

SUBSTANCE: providing of stability of well walls, process controllability of opening of waterbearing formation of operation of two waterbearing formations of one upward drain borehole has become possible ensured by creation of backpressure in annular space of well during all time of its drilling in incompetent rocks and also usage in particular case in the capacity of intermediate string of filtering pipe string. Device for opening of waterbearing stratums in incompetent rocks by upward drain borehole includes drilling rig, rotator, main mud pump, drilling assembly, intermediate string, filtering pipe string and equipment of wellhead, containing conductor, wellhead mandrel, pipes grab, gland, closing sleeve, outlet and shutter. Intermediate string is outfitted by ring, rigidly installed to it at bottom end with ability of installation of sealing ring for overlapping of annular gap between conductor and intermediate string. Device is outfitted by additional boring pump, connected to outlet of wellhead mandrel, and also by nozzle installed at outlet of this branch diametre of which depends on static level of waterbearing formations at wellhead and rotary crane for passing of water into outlet from additional drilling pump.

EFFECT: providing of ability of additional water removing.

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