Method for horizontal drainage system forming in gas production, method for drain hole forming and method for gas recovery from coal bed (variants)

FIELD: mining, particularly for drawing-off gases from coal bed simultaneously with water removing from coal bed.

SUBSTANCE: method involves drilling vertical well having cavity from ground surface; communicating vertical well cavity with horizontal drain holes used for gas recovery from coal bed.

EFFECT: provision of access to large underground area from ground surface and uniform coverage thereof, increased efficiency of gas production due to increased drainage system area along the strike of coal bed and due to improved well drilling technique.

27 cl, 11 dwg

 

The present invention mainly relates to the extraction of minerals from underground deposits, and more specifically to provide a method and system for providing access to subterranean deposits from the surface of the earth.

Underground coal deposits contain significant amounts of gaseous methane, production of which has been ongoing for many years. However, there are significant obstacles to intensive exploration and use of deposits of gaseous methane in coal seams. The main problem in the extraction of gaseous methane from coal seams is that the layers have a large area, extending up to several thousand acres, but small depth component from a few inches to several meters. Thus, despite the fact that coal seams often lie relatively close to the surface, drilled to a coal field vertical wells for the extraction of gaseous methane allow for the collection of gas only in a small radius around the well. Moreover, for the coal deposits are not suitable methods of hydraulic fracturing and other methods that are often used to increase the production of gaseous methane gas from rock formations. As a result, despite the fact that the gas is easily extracted from a coal seam using ver icalneu well, the volume of this production is limited. In addition, coal seams often contain ground water that need to be dissipated from the coal seam to produce methane gas. It has already been proposed to use horizontal drilling to increase the length of the well bore in a coal seam and the increase due to this extraction of gas (see, for example, Kalinin A.G. and other Drilling inclined and horizontal wells. - M.: Nedra, 1997). However, when conducting such horizontal drilling must be applied slanted wells, creating difficulties when removing entrained water from the coal seam. I must say that the most effective method of pumping water from underground wells with hose downhole pump does not work well in horizontal or inclined wells.

An additional problem with the production of gas from coal seams is a violation of the balance ("neobalaenidae") drilling conditions caused by the porosity of the coal seam. As with both vertical and horizontal drilling operations from the surface of the earth using the flush fluid (drilling mud) to remove drilling cuttings from the wellbore to the surface. The flush fluid exerts a hydrostatic pressure on the formation which if exceeded its own hydrostatic pressure in the reservoir leads to the loss of it washing liquid is ti. This leads to an increase in the formation of fine drill solids ("trifles"), which clog the pores, cracks and faults that are necessary for gas production.

These difficulties in the extraction of gaseous methane from coal deposits from the surface of the led that produces destruction of gaseous methane that must be removed before the extraction of coal using underground methods. Although underground mining methods allow you to easily remove the water from the coal seam and remove the specified imbalance drilling conditions, they can provide only limited access to the coal seam, open to ongoing mining operations. When driving long faces (faces) using, for example, underground drilling rigs, allowing you to drill horizontal holes from the camera, which are currently in production, the next cell (production), production of which will be conducted later. Underground drilling rigs do not allow free access to such horizontal holes and therefore limit the scope for effective drainage. In addition, degassing next camera while sinking current camera limits available for the degassing time. So you have to drill multiple horizontal holes required for the removal of gas, within the limited is about time. Moreover, at high gas concentration or migration of coal seam mining should be stopped or paused until then, until a proper degassing of the next camera. This slowdown in production increases the costs associated with degassing of the coal seam.

The present invention relates to provide a method and system for providing access to subterranean deposits from the surface of the earth, which substantially reduce or eliminate disadvantages and problems inherent in previously known methods and systems. In particular, in accordance with the present invention offers a well articulated with such drainage scheme, which crosses the borehole with a horizontal cavity. Drainage schemes provide access from the surface to the extensive underground areas, as well vertical cavity can effectively remove and/or to get passionate about water, hydrocarbons, and other minerals.

In accordance with the first embodiment of the present invention, a method for providing access from the surface to the subterranean zone, which provides for the drilling of mostly vertical wells from the surface to the subterranean zone. From the surface to the subterranean zone also produce articulated drilling borehole. With glenanna borehole horizontally offset from the vertical well bore at the surface and intersects the vertical bore at a joint (connection) near the subterranean zone. Through the articulated well from the junction to the subterranean zone to produce drilling mainly horizontal drainage scheme.

In accordance with another aspect of the present invention mainly horizontal drainage scheme may contain Cirrus scheme, which consists mainly horizontal diagonal well, extending from the main vertical well, which is the first end zone, blocked drainage scheme, going to the remote end of this zone. The first is mainly horizontal lateral wells that have a specific spatial relationship to each other, moving away from the diagonal well bore to the periphery on the first side of the diagonal well bore. There is also a second set mainly horizontal lateral wells that have a spatial relationship with each other that depart from the diagonal well bore to the periphery on the second opposite side of the diagonal (the diagonal well).

In accordance with another aspect of the present invention proposes a method of preparing a subterranean zone to conduct extraction, in accordance with which we use mainly vertical and articulated wells and drainage scheme. Drainage of water from the subterranean zone to the junction of the main vertical wells produced the lead through the drainage scheme. Pumping water from the junction to the surface of the earth produce mainly vertical borehole. Natural gas is produced from the subterranean zone through at least one main vertical well and one well articulated. After completion of the degassing may be preparing a subterranean zone through the pumping of water and other additives in the area through the drainage scheme.

In accordance with another aspect of the present invention a device for position (positioning) of the pump, allowing you to accurately set the downhole pump in the cavity of the well.

Among the technical advantages of the present invention should specify the provision of an improved method and system for providing access to the underground mine to the surface of the earth. In particular, carry out the drilling of horizontal drainage schemes in a given zone of the articulated surface of the well that allows you to provide access to the zone from the surface of the earth. Drainage scheme intersects well with a vertical cavity, from which it is possible to effectively remove and/or extracted using a push-rod pump passionate about water, hydrocarbons and other exhaust from the zone fluids. This allows the efficient production and delivery to the surface of gas, oil and other fluids from the reservoir is, low pressure or low porosity.

Another technical advantage of the present invention is the provision of improved method and system for a drilling operation in low pressure formations. In particular, the use of downhole pump or gas lift to reduce the hydrostatic pressure applied to the washing liquid, which is used to remove drill cuttings (drilling cuttings during drilling operations. Due to this, the drilling can be carried out in reservoirs with ultra-low pressures without the risk of loss of drilling fluids (drilling mud)that could lead to blockage of the formation.

Another technical advantage of the present invention is the provision of an improved horizontal drainage schemes to provide access to the underground area. In particular, the use of Cirrus picture location (Cirrus scheme) wells with the main diagonal and opposite side bends, allowing maximum access to the underground area from a single vertical well. Length of lateral branches is maximum in the immediate vicinity of the vertical hole, and decreases towards the end of the main diagonal, which allows to provide equal access to quadrangular, or other areas of sieves is I. This allows to combine the drainage scheme with long faces (the faces) and other underground structures, which are used for coal seam degasification or another field.

Another technical advantage of the present invention is the provision of improved method and system for preparing a coal seam or other underground deposits for extraction. In particular, use coming from surface wells for coal seam degasification before carrying out operations of field development. This allows you to reduce the volume of underground equipment and works and increases the time available for coal seam degasification, which minimizes the downtime associated with high gas content. In addition, can be produced by pumping water and other additives in degassed coal seam to reduce dust and other harmful substances, which increases the efficiency of the production process and improves the quality of coal produced.

Another technical advantage of the present invention is the provision of improved method and system for obtaining gaseous methane from the coal seam. In particular, those wells that were used for the initial coal seam degasification before surgery the production, can be re-used to collect gas from the goaf coal seam after conducting mining operations. Due to this reduced the costs associated with the collection of gas that makes cost-effective operations gas gathering from the pre-defined layers.

Another technical advantage of the present invention is to provide an installation device for the automatic installation of downhole pumps and other equipment in the cavity. In particular, use rotate in the cavity of the installation device that is drawn to pass through the hole and extends downward inside the cavity for optimal installation of the equipment inside the cavity.

These and other advantages and features of the invention will be more apparent from the subsequent detailed description, given as an example having no limiting character and described with reference to the drawings, in which similar elements have the same reference designators.

Figure 1 shows a cross-section illustrating the formation of horizontal drainage schemes in the underground area through the articulated surface (walking surface) well that intersects the borehole with a vertical cavity in accordance with one variant of the present and the gain.

Figure 2 shows cross-section illustrating the formation of horizontal drainage schemes in the underground area through the articulated surface of the bore, which intersects the borehole with a vertical cavity, in accordance with another variant of the present invention.

Figure 3 shows the cross-section, illustrating the extraction of fluids from horizontal drainage schemes in the underground area through the vertical wellbore in accordance with one variant of the present invention.

Figure 4 shows a top view, showing pinnate drainage scheme to provide access to the deposits in a subterranean zone in accordance with one variant of the present invention.

Figure 5 shows a top view, showing pinnate drainage scheme to provide access to the deposits in a subterranean zone in accordance with another variant of the present invention.

Figure 6 shows a top view which shows a quadrangular pinnate drainage scheme to provide access to the deposits in a subterranean zone in accordance with another variant of the present invention.

Figure 7 shows the top view, showing the combination of pinnate drainage schemes with cameras coal seam for the decontamination and preparation of coal seam to conduct operations field development in line is one of the variants of the present invention.

On Fig shows a block diagram of a method of preparing the coal seam to conduct operations development of the field in accordance with one variant of the present invention.

On figa-With the cross-section, showing the installation of the device in the cavity of the well in accordance with one variant of the present invention.

We now turn to a consideration of figure 1, which shows the combination of the cavity and the articulated well bore to provide access to the underground area with the earth's surface in accordance with one variant of the present invention. In this embodiment, the underground area is the coal seam. It should be borne in mind that when using a dual well system in accordance with the present invention may be provided with access and other subterranean zone having a low pressure, low pressure and low porosity, which allows you to remove and/or produce water, hydrocarbons and other located in a specified zone fluids, as well as to perform processing in a specified area of minerals previously operations development of the field.

Again, let us consider figure 1, which shows mainly vertical well 12, which goes from the ground surface 14 in a given coal seam 15. This is mainly vertical well 12 PR is penetrated coal seam 15, crosses it and continues below the coal seam 15. Specified mainly vertical well has a corresponding casing 16, which ends above the level of the coal seam 15.

Logging vertical well 12 is conducted during drilling or after it, that allows to determine the exact vertical depth of the coal seam 15. As a result, when carrying out subsequent operations drilling impossible to miss coal seam and there is no need to use technical means for the localization of the coal seam 15 in the course of drilling. In mainly vertical borehole 12 at the level of the coal seam 15 is formed cavity of the enlarged diameter 20. As will be described later in more detail, the cavity is enlarged diameter 20 forms a connection (junction) to the intersection of the vertical well articulated well, and this cavity allows the formation of a mainly horizontal drainage scheme in the coal seam 15. The extended cavity diameter 20 is also used to collect fluids pumped from the coal seam 15 in the course of mining operations.

In accordance with one embodiments of the present invention, the cavity is enlarged diameter 20 has a radius of about 8 feet, and a vertical dimension equal to the vertical size Ugolino the reservoir 15 or greater. The extended cavity diameter 20 create using appropriate technologies underground expansion of the wellbore and equipment. The vertical section is mainly vertical well 12 continues below the cavity of the enlarged diameter 20 and forms a sump 22 specified cavity 20.

Articulated bore 30 is from the ground surface 14 to the cavity of the expanded diameter of 20 mainly vertical well 12. Articulated well 30 contains mostly vertical part 32, mainly horizontal section 34 and the curved section 36 connecting these vertical and horizontal sections 32 and 34. Horizontal section 34 lies mainly in the horizontal plane of the coal seam 15 and intersects the cavity of the expanded diameter of 20 mainly vertical well 12.

Articulated bore 30 at the surface 14 is displaced a sufficient distance relative to the main vertical well 12, which allows for drilling curved on a large radius section 36 and any desired horizontal section 34 previously their intersection with the cavity of the enlarged diameter 20. To create a curved section 36 with a radius of 100-150 feet articulated hole 30 must be offset by a distance of about 300 feet relative to the principal about the time of the vertical well 12. This spatial arrangement allows you to choose the angle of the bent section 36 thus, to reduce the friction in the bore 30 in the operations of drilling. This will ensure maximum access to the articulated drill string, introduced through the barrel of the articulated well bore 30.

Drilling an articulated well bore 30 is produced using the articulated drill string 40, which contains the corresponding downhole motor and drill bit (drill bit) 42. In the articulated drill string 40 is provided by the unit of measurement while drilling (MWD) 44, which allows you to control the orientation and direction of the wellbore, the drilling of which lead through the motor and drilling crown 42. Mainly the vertical section 32 of the articulated well bore 30 is fixed with the casing 38.

After successfully crossing the cavity of the enlarged diameter 20 of the articulated well 30 continue drilling through the cavity 20 using the articulated drill string 40 and corresponding device for horizontal drilling, which allows to obtain the mainly horizontal drainage scheme 50 in the coal seam 15. Mainly horizontal drainage scheme 50 and other similar trunks wells include oblique, wavy or going under glam to horizontal sections in the coal seam 15 or other underground area. During the operation of the sinking can be used logging device with gamma rays and other conventional measurement tools to control the direction of orientation of the drilling crown, so to keep the drainage circuit 50 within the borders of the coal seam 15 and to provide a mainly uniform coverage (overlap) desirable area within the coal seam 15. More detailed information on drainage schemes can be obtained from the further description, made with reference to Fig.4-7.

During the process of drilling drainage scheme 50 washing fluid or "mud" is pumped through the articulated drill string 40 and circulates outside of the drill string 40 in the immediate vicinity of the drilling crown 42, where it is used for erosion of the reservoir and to remove drilling cuttings. Cuttings are fond of washing liquid, which flows upward through the annular space between the drillstring 40 and the walls of the wellbore and reaches the earth's surface 14, where the cuttings are removed from the washing liquid, and the liquid is then used again. During the normal operation of the drilling receive a standard column of drilling mud (drilling fluid), which has a vertical height equal to the depth of the borehole 30, with hydrostatic Yes the pressure in the well corresponds to the depth of the well. As the coal layer may be porous and may have cracks, it may not withstand such hydrostatic pressure, even if the coal seam 15 there is produced water. Thus, if the coal seam 15 full effect of hydrostatic pressure, the result can be a loss of drilling fluid and entrained cuttings breed in the reservoir. This situation is called "pereplanirovki" drilling operation, while the hydrostatic pressure of the fluid exceeds the capacity of the reservoir to withstand such pressure. The loss of drilling fluid with drilled cuttings breed in the reservoir not only leads to economic losses due to lost circulation fluid, which has to recharge, but also leads to clogged pores in the coal seam 15, which is necessary for drainage from coal seam gas and water.

To prevent conditions rebalancing when forming the drain circuit 50 provides air compressors 60, which circulate compressed air down through the main vertical well 12 and back up through the articulated well 30. Circulating air will podmahivat to the drilling fluid in the annular space around the articulated drill string 40 and will create bubbles in the entire column of drilling fluid (flush W is dasti). This effectively reduces the hydrostatic pressure of the drilling fluid and reduces downhole pressure to such an extent that there is no rebalancing drilling conditions. Aeration of the drilling fluid reduces downhole pressure up to about 150-200 pounds per square inch (psi). Due to this, you can perform drilling with low pressure coal seams and other underground areas without significant loss of drilling fluid and without contaminating them these zones.

You can also produce the circulation of the foam, which is a mixture of compressed air with water, down through the articulated drill string 40, together with the mud in order to produce aeration of the drilling fluid in the annular space in the course of drilling an articulated well bore 30 and, optionally, in the course of drilling drainage scheme 50. When drilling the drainage circuit 50 using a drill bit with a hammer or using a downhole motor with air-operated in the drilling fluid is also supplied with compressed air or foam. In this case, compressed air or foam, which are used to actuate the drill bit or downhole motor, are in the immediate vicinity of the drilling crown 42. However, a larger volume of air that can be directed down through the main vertical well 12, allows manufacturers is to build a stronger aeration of the drilling fluid, than is typically possible due to the air supplied through the articulated drill string 40.

Figure 2 shows a method and system for drilling a drainage circuit 50 in the coal seam 15 in accordance with another embodiment of the present invention. In this embodiment, mainly the vertical well 12, the cavity is enlarged diameter 20 and articulated well have 32 and formed in accordance with previously described for figure 1.

Figure 2 shows that after crossing the cavity of the expanded diameter of 20 articulated bore 30 in the cavity of the expanded diameter of 20 installing the pump 52 for pumping drilling fluid and drilling cuttings to the surface 14 through the main vertical bore 12. This eliminates the friction of air and fluid, rising up through the articulated well 30, and reduces the bottomhole pressure is almost zero. The result can be accessed through the surface into the coal seams and other subterranean zone having a low pressure less than 150 psi. In addition, this eliminates the risk of connection of air with methane in the well.

Figure 3 shows the extraction of fluids from horizontal drainage scheme 50 in the coal seam 15 in accordance with one variant of the present invention. In this embodiment, after drilling mainly vertical and articulated SK is Agin 12 and 30, it is also advisable to drain circuit 50 extracts the articulated drill string 40 from the articulated well bore 30 and articulated well sealed. For various described here below plumose structures sealing of the articulated well bore 30 may be carried on mainly horizontal section 34. Otherwise articulated bore 30 can be sealed.

Again, let us consider figure 3, which shows the downhole pump 80, located at the exit of the main vertical bore 12 in the cavity of the enlarged diameter 22. The extended cavity diameter 20 forms a reservoir for the accumulation of fluid, which allows for intermittent injection without the harmful effects of hydrostatic pressure created by the accumulation of fluids in the well.

Downhole pump 80 is connected to the surface 14 through tubing columns 82 and can be powered by means of rods 84, reaching down inside the column 82 of the bore 12. Pump rod 84 can perform a reciprocating motion by the drive from the suitable set on the surface of funds, such as the rocker 86 that allows you to operate the downhole pump 80. Downhole pump 80 is used for removal of water and entrained drilling of coal seam 15 through a drain of the scheme 50. After the withdrawal of water to the surface of produce processing for separation from methane, which can be dissolved in water, and to remove passionate about things (minor drilling). After pumping a sufficient volume of water from the coal seam 15 to the surface 14 can enter the clean gas from the coal seam through the annular space mainly vertical bore 12 around the tubing of the column 82, which divert through pipes connected with the mouth of the well. On the surface, the methane process, compress and served by pipeline for use as fuel, which is in itself known. Downhole pump 80 may be operated continuously or as needed to remove water withdrawn from the coal seam 15 in the cavity of the enlarged diameter 22.

Figs.4-7 shows mainly horizontal drainage circuit 50 to provide access to the coal seam 15 or other subterranean zone in accordance with one variant of the present invention. In this embodiment, the drainage schemes are pinnate drainage schemes, with the Central diagonal, and mostly symmetrical and accordingly displaced lateral sections extending from each side of the diagonal. Cirrus scheme is reminiscent of the arrangement of veins in a leaf or built with the s pen birds, and similar mainly parallel auxiliary drain holes (taps) are located at the same distance from each other on opposite sides of the axis. Such pinnate drainage scheme with a Central hole (well) and symmetric located at the same distance from each other on each side of the axis of the auxiliary drainage holes, is a homogeneous scheme for the drainage of fluids from the coal or other underground reservoir. As it will be explained here in more detail below, Cirrus scheme is mainly ensured by a uniform coverage of square, rectangular or net area and can be combined with long faces (faces) for the preparation of coal seam 15 to conduct mining operations. Needless to say that this guide is not of a restrictive nature and in accordance with the present invention can be used, and other drainage scheme.

Cirrus and other suitable drainage schemes, the drilling of which is produced from the earth's surface, allow access to the underground reservoir. The drainage scheme can be used for uniform output and/or input fluids, as well as other kinds of processing underground deposits. In case of no coal deposits drainage scheme can be used in AWANA to initiate combustion at the location, for operations "huff-puff" steam application in the case of heavy crude oil, and for extraction of hydrocarbons from porous deposits.

We now turn to a consideration of figure 4, showing pinnate drainage scheme 100 in accordance with one variant of the present invention. In this embodiment, pinnate drainage scheme 100 provides access to the main square area 102 of the underground zone. To ensure uniform access to a wider pedestrian area in conjunction with the drainage scheme can be used several drainage schemes 60.

Figure 4 shows the extended cavity of diameter 20, which limits the first corner region 102. Pinnate drainage scheme 100 includes a main horizontal main bore 104 which extends diagonally across the area 102 to a remote corner 106 region 102. Mainly over the area 102 are mainly vertical and articulated well bore 12 and 30 so that the diagonal bore 104 drilled up the slope of the coal seam 15. This facilitates the collection of water and gas from the region 102. The sinking of the diagonal bore 104 is manufactured using the articulated drill string 40 and the bore 104 extends from the extended cavity 20 in alignment with the articulated well 30.

From opposite sides of the diag the national borehole 104 leaves many lateral wells (taps) 110, going to the periphery 112 of the area 102. Lateral wells can mirror each other on opposite sides of the diagonal bore 104 or may be offset relative to each other along a diagonal bore 104. Each of the side wells 110 has a curved radius plot 114, extending from the diagonal well bore 104, and an elongated section 116 formed after reaching the curved section 114 desirable orientation. To ensure uniform coverage of the square region 102 of the pair of lateral wells 110 mainly evenly distributed on each side of the diagonal well bore 104 and go from diagonal 64 at an angle of about 45 degrees. The lateral hole 110 are shortened in length as the distance from the cavity of the expanded diameter of 20 to facilitate the drilling of lateral wells 110.

Pinnate drainage scheme 100 that contains only the diagonal bore 104 and 5 pairs of lateral wells 110, allows drainage of coal seam area of about 150 acres. In case of the need for smaller drainage areas or other form of coal seam, for example, with its long and narrow shape, as well as in the specific topography of the earth's surface or underground topography can be used an alternate pinnate drainage schemes, obtained by changing the angle of the side of squag the n 110 with diagonal hole 104 and change the orientation of the lateral wells 110. Alternatively, the lateral bore 120 may be drilled from only one side of the diagonal well bore 104 with the formation of half of the Cirrus scheme.

The sinking of the diagonal well bore 104 and lateral wells 110 is made by drilling through the cavity of the expanded diameter of 20 using the articulated drill string 40 and the corresponding equipment for horizontal drilling. During the operation of the sinking can be used logging device with gamma rays and other conventional measurement tools to control the direction of orientation of the drilling crown, so to keep the drainage scheme within the borders of the coal seam 15 and to ensure proper placement and orientation of the diagonal and the side of the wells 104 and 110.

In accordance with a particular embodiment of the present invention, the diagonal drilling wells 104 produce a tilt in each of the multiple points of introduction of lateral branches 108. After sinking the diagonal 104 produces a shift back of the articulated drill string 40 in each of the successive points 108, which produce the drilling of lateral wells 110 on each side of the diagonal line 104. It should be borne in mind that the pinnate drainage scheme 100 in accordance with the present invention can be formed in any other suitable manner.

Let us now turn to the RA the Providence of figure 5, showing pinnate drainage circuit 120 in accordance with another variant of the present invention. In this embodiment, pinnate drainage scheme 120 used for drainage mainly rectangular region 122 of the coal seam 15. Pinnate drainage scheme 120 contains the main diagonal hole 124 and multiple lateral wells 126, which are formed similarly to the diagonal and the side wells 104 and 110 figure 4. However, in the case of mainly rectangular region 122 of the lateral bore 126 on the first side of the diagonal 124 have a more gentle angle, while the lateral hole 126 on the opposite side of the diagonal 124 have a steeper angle to jointly provide uniform coverage area 12.

Let us now turn to the consideration of Fig.6, which shows the quadrilateral pinnate drainage circuit 140 in accordance with another variant of the present invention. In this embodiment, the quadrilateral pinnate drainage scheme 140 includes 4 separate pinnate drainage scheme 100, each of which is used for the drainage of one of the quadrants of the district 142, overlapped Cirrus drainage scheme 140.

Each of the pinnate drainage schemes 100 contains a diagonal bore 104 and multiple lateral wells 110, extending from the diagonal well bore 104. In the four-sided embodiment, each of the diagonal and Boko what's wells 104 and 110 are drilling from the total of the articulated well bore 141. This allows more compact to accommodate operational equipment on the surface and to provide a broader coverage of the drainage scheme, as well as to reduce the volume of drilling equipment and operations.

Let us now turn to the consideration of Fig.7, which shows the combination of pinnate drainage schemes 100 with underground coal seam structures for the decontamination and preparation of coal seam to conduct mining operations in accordance with one embodiments of the present invention. In this embodiment, the extraction of coal seam 15 are using lava (long face). It should be borne in mind that the present invention can be used for the degassing of coal seams and other prey.

7 shows coal chamber 150, running in the longitudinal direction from the lava 152. In accordance with the practice of mining using longwall mining in each of the chambers 150 are remote from its end towards the lava 152, and the roof of the mine, destroy and bring in the camera upon completion of the mining process. Prior to the development of cameras produce 150 drilling from the surface of the pinnate drainage schemes 100 150 cameras for degassing chambers 150. Each of the pinnate drainage schemes 100 combine with lava 152 and a grid of cameras 150 for coverage areas of one or more cameras 150. Due to this can be done degases the I with the surface area of the mine, including underground structures and constraints.

On Fig shows the block diagram of the method of preparation of the coal seam 15 to conduct mining operations in accordance with one variant of the present invention. In this embodiment, the preparation begins with operation 160 identify areas of drainage and drainage schemes 50 for these areas. Mainly these areas combined with the grid plan of mining operations in the area. For optimal overlap of the specified area can be used plumose structures (drainage schemes) 100, 120 and 140. It should be borne in mind that other suitable drainage schemes can be used for degassing of the coal seam 15.

Operation 162 produce drilling from the surface 14 through the coal seam 15 is mainly vertical well 12. Then, when the operation 164 use downhole logging equipment to accurately identify the location of a coal seam in a mainly vertical borehole 12. During the operation 166 form an extended cavity diameter 22 in mainly vertical borehole 12 at the location of the coal seam 15. As mentioned here previously, the cavity is enlarged diameter 20 may be formed through an underground means of enhancing the well bore and other known technologies.

Then, when the operation 168 produce drilling is oclemena bore 30 to the intersection with the cavity of the enlarged diameter 22. At operation 170 produce drilling through the articulated well 30 main diagonal bore 104 for pinnate drainage scheme 100 in the coal seam 15. After forming the main diagonal bore 104 at operation 172 to produce the drilling of lateral wells 110 for pinnate drainage scheme 100. As mentioned here previously, the side of the point of introduction can be formed in a diagonal hole 104 at its formation to facilitate the drilling of lateral wells 110.

During the operation 174 produce the sealing of the articulated well bore 30. Then, when the operation 176 produce clean extended diagonal of the cavity 22 to prepare for the installation of downhole exploitation (mining) equipment. The extended cavity diameter 22 may be cleaned by forcing compressed air through the main vertical well 12 or by other appropriate technologies. During the operation 176 make installation of operational equipment in the main vertical well 12. Specified operating equipment includes well pump hose going down into the cavity 22 to remove water from the coal seam 15. The removal of water leads to a reduction of pressure in the coal seam and allows gaseous methane to diffuse and addressed the change in the annular space mainly vertical well 12.

At operation 180 is produced using a peristaltic pump of pumping on surface water, which is collected in the cavity 22 through the drain circuit 100. Pumping water is produced continuously or intermittently, depending on its number in the cavity 22. During the operation 182 produce continuous collection on the surface of the gaseous methane diffusing from the coal seam 15. Finally, when performing the last operation 184 determines whether completed production of gas from the coal seam 15. In accordance with one variant of the decision to cease production of gas taken in excess of a given value of production. In accordance with another option gas production continue to reduce the level of gas in the coal seam 15 to a specified residual level. If gas production is not completed, the operation 184 return to operations 180 and 182, while conducting continue to remove water and to produce gas from the coal seam 15. After extraction from the operation 184 is transferred to operation 186, at which derive operational equipment.

Then, when the operation 188 determines whether to perform additional preparation of the coal seam 15 for field development. If a positive decision from the operation 188 proceed to operation 190, in which the coal Plaza is 15 is filled with water and other additives, for re-hydration of a coal seam that is necessary to reduce the dust level, increase production and improve the quality of the extracted product.

If a negative decision from the operation 188 proceed to operation 192, which produce the coal seam 15. Removing coal from the reservoir leads to the destruction and collapse of the roof developed a camera on the end of the production process. The collapse of the roof creates a gas blockage, which can be collected during the operation 194 through the main vertical bore 12. Therefore, no additional procedures are required drilling to collect gas from the exhaust blockage of a coal seam. This operation 194 leads to the completion of the process of effective degassing of the coal seam from the surface of the earth. The proposed method provides a symbiotic relationship with mine that allows you to remove unwanted gas previously carrying out the extraction and re-hydration of a coal seam prior to its development.

On figa-9C shows the deployment model (commissioning) abdominal submersible pump 200 in accordance with one variant of the present invention. Let us consider figa showing cavitary submersible pump 200, which contains the downhole section 202 and device for position in the cavity 204. With Vinny section 202 has an inlet 206 for suction and pumping of the fluid, which is contained in the cavity 20, to the surface of the vertical hole 12.

In this embodiment, the device for position in the cavity 204 is connected for rotation with the borehole section 202, which allows the rotation (turn) of the device to select 204 relative to the borehole section 202. To enable rotation can be used, for example, a pin, axle or other suitable device (not necessarily shown on the drawings)that allows you to connect the device to select the position in the cavity 204 with borehole section 202 for rotation device for position around the axis 204 208 relative to the borehole section 202. Thus, the device for position in the cavity 204 may be connected to the downhole section 202 between one end 210 and the other end 212 of the device for position in the cavity 204 so that both ends 210 and 212 can rotate relative to the borehole section 202.

Device for position in the cavity 204 also contains a plot of the counterweight 214, allowing to control the position of the ends 210 and 212 relative to the borehole section 202 in the absence of support. For example, a device for position in the cavity 204 is in the form of a shell on the axis 208 relative to the borehole section 202. The plot of the counterweight 24 is located between the axis 208 and the end 210 so that the weight or mass of this area 214 balancing device for position in the cavity 204 in the course of its deployment and extension abdominal submersible pump 200 relative to the vertical well 12 and the cavity 20.

In the working position of the device for position in the cavity 204 is deployed in a vertical well 12, and the end 210 and a part of the counterweight 214 are in retracted, the end 210 and a part of the counterweight 214 are adjacent to the borehole section 202. When the movement of the abdominal submersible pump 200 down in a vertical well 12 in the direction indicated by the arrow 216, the length of the device for position in the cavity 204 prevents turning movement of this device 204 relative to the borehole section 202. For example, the mass of part of the counterweight 214 can hold this area 214 and the end 212 in contact with the vertical wall 218 of the vertical well 12 when abdominal submersible pump 200 is moved downward in a vertical well 12.

Let us now turn to the consideration figv, which shows that when moving abdominal submersible pump 200 down in a vertical well 12 plot counterweight 214 causes the rotation of the device for position in the cavity 204 relative to the borehole section 202, when the device for position in the cavity 204 extends from the vertical bore 12 in the spine 20. When the device for position in the cavity 204 extends from the vertical well 12 into the cavity 20, then the plot of the counterweight 214 and the end 212 lose the support, which was created by a vertical wall 218 in the vertical well 12, and therefore the area of the counterweight 214 automatically rotates the device for position in the cavity 204 relative to the borehole section 202. The plot of the counterweight 214 prompts the end 210 to perform a rotation about a vertical borehole 12 or leave it out in the direction indicated by the arrow 220. In addition, the end 212 of the device for position in the cavity 204 is shifted or rotated outward relative to the vertical bore 12 in the direction indicated by the arrow 222.

The length of the device for position in the cavity 204 is chosen so that its ends 210 and 212 are losing support in a vertical well 12 when the device for position in the cavity 204 extends from the vertical well 12 into the cavity 20, which allows the area of the counterweight 214 to cause rotation of the end 212 relative to the borehole section 202, to pass over the annular section 224 of the sump 22. Thus, the device for position in the cavity 204 extends from the vertical well 12 into the cavity 20 and the section of the counterweight 214 rotates end 212 in the direction of arrow 222, and when moving downward the abdominal submersible pump 200 end 212 comes in contact with the horizontal wall 226 of the cavity 20.

Let us now turn to the consideration figs, which shows that further moves down deep submersible pump 200 and the input end 212 into contact with the horizontal wall 226 of the cavity 20 causes additional rotation of the device for position in the cavity 204 relative to the borehole section 202. The presence contact end 212 with a horizontal wall 226 in conjunction with the downward movement abdominal submersible pump 200 prompts the end 210 to perform a rotation about a vertical bore 12 in the direction indicated by the arrow 228, until the section of the counterweight 214 is not in contact with the horizontal wall 230 of the cavity 20. After the section of the counterweight 214 and the end 212 of the device for position in the cavity 204 abuts the horizontal wall 226 and 230 of the cavity 20, further downward movement abdominal submersible pump 200 is impossible, which leads to accurate installation inlet 206 in a predetermined location in the cavity 20.

As the inlet 206 may occupy different positions along the borehole section 202 can be selected and its exact location in the cavity 20 when the device for position in the cavity 204 abuts the bottom of the cavity 20. Due to the accurate installation of the inlet 206 in the cavity 20 is excluded fence sediment or other material from the sump 22 and eliminates interference during the Oia gas, which could be triggered by the presence of the inlet 20 into the narrow hole. In addition, the inlet 206 may be installed in the cavity 20 so as to provide maximum drainage of fluid from the cavity 20.

When conducting a reverse move up abdominal submersible pump 200 leads out of contact with the respective horizontal walls 226 and 230 section of the counterweight 214 and end 212. When the loss of the base in the cavity 20 of the device for position in the cavity 204, the weight of this device 204 located between the end of the axis 212 and 208, encourages to turn the device for position in the cavity 204 in a direction opposite to the direction indicated by arrows 220 and 222 on figv. In addition, the area of the counterweight 214 together with the mass device 204 located between the end 212 and an axis 208 induces a device for position in the cavity 204 be combined with a vertical bore 12. Thus, there is an automatic alignment device for position in the cavity 204 with a vertical bore 12 when abdominal submersible pump 200 is removed from the cavity 20. In addition, the upward movement abdominal submersible pump 200 can be used for removal from the cavity 20 and the vertical hole 12 of the device for position in the cavity 204.

Thus, the present invention allow you to plug the em to ensure higher reliability, than previously known systems and methods, due to the installation of the inlet cavity 206 submersible pump 200 in a predetermined location in the cavity 20. In addition, abdominal submersible pump 200 can be efficiently extracted from the cavity 20 without the use of additional fixation devices and combination, which facilitates the withdrawal of the abdominal submersible pump 200 of the cavity 20 and a vertical borehole 12.

Despite the fact that have been described preferred embodiments of the invention, it is clear that it specialists in this field can be amended and supplemented, which do not extend, however, beyond the scope of the following claims.

1. A method for forming horizontal underground drainage system to provide access to the quadrilateral area of a subterranean zone, comprising forming a diagonal borehole with a horizontal shaft, running diagonally from the first corner of the quadrilateral area to a distant corner of the site; forming a first set of horizontal boreholes, running at a distance from each other from the diagonal bore hole to the periphery of the quadrilateral area on the first side of the diagonal bore hole; and forming a second set of horizontal boreholes, running at a distance from each other from the diagonal is Noah drill hole to the periphery of the quadrilateral area on the second the opposite side of the diagonal.

2. The method according to claim 1, characterized in that the length of the branched drill holes is gradually reduced with increasing distance from the first corner of the quadrilateral section.

3. The method according to claim 1, characterized in that the branched boreholes formed at an angle of 40 to 50 degrees with respect to the diagonal drilling the well.

4. The method according to claim 3, characterized in that the branched boreholes formed at an angle of about 45 degrees with respect to the diagonal drilling the well.

5. The method according to claim 1, characterized in that the quadrilateral area is a square.

6. The method according to claim 1, characterized in that the diagonal and branch boreholes provide uniform coverage of the area.

7. The method according to claim 1, characterized in that the branched boreholes in each of the first and second multiple branch wells are located at the same distance from each other.

8. The method of extracting gas from underground coal seam, comprising the drilling of the first main vertical borehole intersecting with the above a coal seam; the logging of the specified drill hole to determine the depth specified coal seam; forming a cavity with an expanded diameter specified in the first drill hole on the opertion is not a coal seam; drilling of the second borehole, offset horizontally from the first borehole and the second borehole includes a horizontal section, intersecting with the above-mentioned cavity; drilling the main drainage borehole with a horizontal shaft located in the specified coal seam; and withdrawal of gas from the coal seam through the specified drainage borehole.

9. The method according to claim 8, characterized in that in the presence of indicated coal seam excess water further includes the installation of the pump at the specified cavity and the pumping of water from the coal seam through the specified drainage borehole.

10. The method according to claim 8, characterized in that carry out the drilling of many additional drainage wells in a coal seam, which intersect with the main drainage of the drill hole.

11. The method according to claim 10, characterized in that the primary and secondary drainage boreholes form Cirrus structure.

12. The method of extracting gas from underground coal seam, comprising the drilling of the first borehole from the ground surface to the intersection with coal seam; the logging of the specified drill hole to determine the depth specified coal seam; forming a cavity with an expanded diameter in the specified first drilling the borehole; drilling a hole is blaumeise borehole from the surface to intersect with the specified cavity; the use of the above branches off borehole for drilling the main drainage borehole with a horizontal bore in a coal seam; the formation of many additional drainage wells in a coal seam, each of which intersects with the specified primary drainage drilling well; pumping water from the coal seam through the additional and main drainage boreholes in the specified cavity; pumping water from this cavity to the surface through the first borehole; the flow of gas from the coal seam through said additional and main drainage boreholes; and the output gas to the surface through the said first borehole.

13. The method according to item 12, wherein the primary and secondary drainage boreholes form Cirrus structure.

14. A method of reduction in working condition drainage boreholes in underground coal seam, comprising the drilling of the first borehole, coming from the earth's surface at least to the depth of the location of the coal seam; the logging of the specified first drill hole to determine the depth of intersection above a coal seam with this well; the extension of the specified diameter of the first drill hole at a depth of coal seam for forming cavities; drilling otetsudai the Xia borehole, located at a distance from the first drill hole and composed of vertical sections, going from the ground surface to a depth less than the depth of the coal seam horizontal section that intersects the specified cavity, and a curved section connecting with vertical and horizontal sections; using the articulated drill string passing through these branches off bore-hole and the cavity for drilling the main drainage borehole in the coal seam; the flow of drilling mud down through the drill string and back up through the annular space between the branches off of the drill hole and the drill column to remove drilling cuttings from the drainage borehole; and adulteration of compressed air to the drilling mud to reduce the hydrostatic pressure in the drain hole.

15. The method according to 14, characterized in that at least part of the compressed air is supplied through the drill string.

16. The method according to 14, characterized in that at least part of the compressed air is supplied through the first borehole.

17. The method according to 14, characterized in that it further includes removing the drill string from the drainage borehole and branches off borehole; the branches off logging borehole; the pumping of water and conclusion ha is and from the coal seam through the drainage borehole; and output of water and gas to the surface through the main borehole.

18. The method of extracting gas from underground coal seam, comprising the drilling of the first vertical borehole that intersects the coal seam; drilling a second borehole, horizontal branches off from the first borehole and including a horizontal section that intersects the first well drilling; drilling in coal seam drainage borehole with a horizontal shaft, and drainage borehole goes from the intersection of the first and second wells; and withdrawal of gas from the coal seam through the drainage bore-hole and the first borehole.

19. The production method of formation gas from the dry gas reservoir, which includes the formation of a system of drainage in the coal seam, which comprises the main drainage well and a lot of additional drainage wells extending from the main bore so that the drainage system provides uniform coverage of the selected area of the coal seam in which it is located, and the output of water and formation of gas from the coal seam through the drainage system.

20. The method according to claim 19, characterized in that the drainage system includes a Central hole which goes additional drainage wells.

21. The method according to claim 20, characterized in that the additional drainage wells mainly symmetrically located on each side of the Central hole.

22. The method according to claim 19, characterized in that the drainage system is horizontal.

23. The method according to claim 19, characterized in that it further includes forming a cavity that is connected to the drainage system; and the simultaneous removal of water and formation of gas from the dry gas reservoir through this cavity.

24. The method according to item 23, wherein the cavity with an expanded diameter has a diameter of about 2.6 m

25. The method according to claim 19, characterized in that the additional drainage wells are gradually shortened as it is removed from the Central bore.

26. The method according to claim 19, characterized in that the water layer and the gas derived from the quadrilateral area of the gas-dynamic layer.

27. The method according to claim 19, characterized in that the drainage system provides uniform coverage of the area of the gas-dynamic layer.



 

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