CN111827878B - Method for quickly and accurately probing hidden water inrush channel of coal seam floor - Google Patents
Method for quickly and accurately probing hidden water inrush channel of coal seam floor Download PDFInfo
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- CN111827878B CN111827878B CN202010519521.3A CN202010519521A CN111827878B CN 111827878 B CN111827878 B CN 111827878B CN 202010519521 A CN202010519521 A CN 202010519521A CN 111827878 B CN111827878 B CN 111827878B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention provides a method for quickly and accurately probing a hidden water inrush channel of a coal seam floor, which comprises the following steps: step 1, analyzing hydrogeological conditions of water inrush of a working face, and determining the position of a vertical drilling hole for construction according to the water inrush position of the working face; step 2, jet hole design is carried out; step 3, selecting a construction position; step 4, quickly constructing a vertical drilling hole, carrying out well logging before casing running of the vertical drilling hole, further determining physical properties of a target layer, and selecting an optimal layer section; step 5, evaluating the consolidation degree of the stratum, and selecting a proper drill bit and drilling fluid; step 6, collecting rock physical properties, aquifer thickness and production data, and selecting a proper drilling mode; step 7, ensuring that the sleeve and the stratum have better consolidation to support the jet orifice; and 8, constructing jet drilling in all directions according to design, determining a preferential construction direction according to the position of the water inrush point, other relevant water inrush information on site and the hydrological conditions of the working surface, and constructing left and right at intervals until the position of the water inrush channel is found.
Description
Technical Field
The invention relates to the technical field of coal mine water disaster prevention, in particular to a method for quickly and accurately probing a disaster water burst channel of a coal seam floor by utilizing a radial hydraulic perforation technology, which is used for large and extra-large water burst flooded well water disaster treatment engineering of a coal mine.
Background
Mine water inrush is one of the most prominent problems troubling and threatening the coal mine safety production in China. According to incomplete statistics, in more than 20 years since the 90 s of the 20 th century, 250 mines in China have been subjected to water inrush flooding accidents, the direct economic loss reaches more than 400 hundred million yuan, serious personal casualties and huge economic loss are brought to enterprises, and meanwhile, the water environment and water resources in mining areas are greatly damaged. Over 30 years, although the technical level of coal mine production and construction is improved to a great extent, water inrush accidents of coal mines occur sometimes; particularly, since 2000, the water inrush accidents of coal mines in China are on the rise, and a large number of water inrush cases show that the major water inrush and well flooding accidents in North China are mostly caused by the fact that Ordovician limestone karst confined water of a coal-based foundation intrudes into a mine. The mines are mainly distributed in North China rock charcoal two-tier coal fields, including mine areas such as Peak peak, kai 28390, handan, chen Tai, weibei, feicheng, xinwen, flat-topped mountain, joker and Huanan. Coal reserves in the North river Handchen coal mining area threatened by karst confined water of the bottom plate are up to 30 hundred million t, and account for more than 60% of the ascertained coal resource reserves.
The water disaster of the coal mine is one of five mine disasters parallel to gas, fire, coal dust, roof accidents and the like, the accident occurrence frequency and the severity of the caused loss are only inferior to those of the gas, and serious accidents such as group death and group injury are easy to happen. The occurrence of water inrush accidents not only submerges mines and mining areas to influence normal production of the mines, but also can cause casualties sometimes to cause huge economic loss and mental injury to countries and people. And the emergency difficulty is large, the time is long and the cost is high. According to preliminary statistics, hydrogeological conditions of key coal mines in China are about 25.1% of those of complex and extremely complex mines; the coal reserves of the mines threatened by water damage are more than 40.5 percent, the national coal reserves seriously threatened by water damage are more than 570 hundred million t, the coal reserves are mainly distributed in a rock-charcoal two-tier coal field in North China and account for more than 60 percent of the national yield, a huge thick Ordovician limestone water-bearing layer is arranged under a coal-bearing stratum, the confined water is high, the hydrogeological conditions of the mines are very complex, and the coal resource exploitation is seriously threatened by water damage. Along with the increase of the mining depth of a coal mine, the probability of the water inrush of the Ordovician ash of the coal seam floor is increased under the coupling action of high pressure bearing water and mining. Particularly, over 10 years, along with the increasing of the mining depth of a mine, the water inrush frequency is increased by nearly 157 percent, and the pressure-bearing water hazard becomes a serious safety threat for deep mining of North China coal fields.
Therefore, limited to the current technical conditions and knowledge, under the condition that the water inrush of a coal mine cannot be completely avoided, the very practical problem is that once the water inrush of the coal mine occurs, the only choice is to rapidly plug a water inrush point and rapidly reproduce, so that the loss caused by the water inrush can be reduced to the maximum extent. Therefore, the key of rapid water plugging is to rapidly determine the position of a water inrush channel, which is a major technical problem to be solved urgently by the coal mine water prevention and control profession. However, the conventional method for searching for a water inrush channel in domestic treatment of water inrush at present has geophysical prospecting method but limited precision, and the other method is a drilling method, although the current drilling speed has great progress and a multi-horizontal branch hole technology is also applied to a water plugging technology, the method still has defects in the aspect of searching for the water inrush channel, the pure drilling efficiency is best to be 8.3m/h and needs to be further improved, and the pure drilling rate of the radial hydraulic jet technology is 100m/h.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a method for quickly and accurately probing a hidden water inrush channel of a coal seam floor, which utilizes a radial hydraulic jet technology to quickly determine the hidden water inrush channel and creates conditions for quickly blocking water.
The invention aims to provide a method for quickly and accurately probing a hidden water inrush channel of a coal seam floor, which comprises the following steps:
step 1, analyzing hydrogeological conditions of water inrush of a working face, and determining the position of a vertical drilling hole according to the water inrush position of the working face;
step 3, selecting a construction position;
step 7, ensuring that the sleeve and the stratum have better consolidation to support the jet orifice;
and 8, constructing jet drilling in all directions according to design, determining a preferential construction direction according to the position of the water inrush point, other relevant water inrush information on site and the hydrological conditions of a working surface, and constructing radial branch holes at intervals from left to right direction by direction until the position of the water inrush channel is found.
Preferably, the drilling in the step 1 can be extended to the lime layer at the later stage to be used as a hydrological observation hole or a source-plugging drilling hole.
Preferably, the step 2 comprises: jet holes are selected to be arranged in a water-resisting rock stratum below a coal seam floor in an all-around mode according to vertical drilling, the horizontal length of the jet holes is 100m, and the hole spacing is calculated and determined by the fact that water inrush channels are distributed not to exceed 30m in front of and behind a working face mining line and the minimum construction radius of a mining area.
Preferably, the step 3 comprises: the jet flow drilling holes are arranged in silty mud rock layers or muddy silty sand water-proof rock layers below the coal seam floor, once large cracks are met, the jet flow holes stop drilling forwards, and the positions of the jet flow holes can be determined as water inrush channels.
Preferably, the step 4 is implemented by using a T130 or T200 American truck-mounted drilling rig.
Preferably, the step 4 comprises:
step 41, grinding and milling a hole on the sleeve at the designed position by using a drill bit;
and step 42, performing hydraulic rock breaking by means of high-pressure jet flow by using a hose with a jet drill bit.
Step 43, a process technique for drilling multiple boreholes at different locations in the formation of interest.
Step 44, hydraulic jet drilling: the high-pressure pump pressurizes the solid-free drilling fluid, the coiled tubing is conveyed to a target layer in a drill hole, the drilling fluid passes through the jet drill bit, high pressure is converted into kinetic energy of high-speed jet flow to penetrate through a stratum, and finally the radial branch hole is formed.
Preferably, in the step 44, a guide shoe is used for controlling the direction, a gyroscope system is used for accurate positioning, and different layers of the same stratum or a single hole can be radially drilled, so that the method is suitable for coal beds, shale, carbonate rocks and argillaceous siltstones.
Preferably, the construction parameters for performing the hydraulic jet drilling in step 44 include: one radial branch hole needs to be used for pulling up and pulling down the continuous oil pipe twice; the diameter of the radial branch hole is 25-76 mm; the penetration depth is 0-100m; the design temperature is below 120 ℃, and the pressure is up to 90MPa; the maximum working well depth 3680m; no solid phase drilling fluid, and filtering the liquid to be below 10 mu m.
Preferably, step 44 is hydraulic jet drilling, with a high pressure pump pressurizing the solids free drilling fluid to a maximum pressure of 20000psi.
Preferably, the step 7 comprises: the oil pipe is arranged in the casing, and the centralizers are symmetrically arranged between gaps between the oil pipe and the casing, so that the casing and the stratum are well solidified to support the jet orifice. The inner part of the jet pipe is provided with a jet drill bit. The whipstock is symmetrically arranged on the outer side of the lower part of the centralizer, a small hole is drilled on the casing in the radial hole-forming hydraulic jetting operation, the windowing tool string can complete windowing in the direction perpendicular to the oil pipe through the whipstock, a plurality of bare holes can be formed in a whipstock cover on the cross section, and the whipstock cover is connected with the production string and the anchor through the bare holes.
The invention has the beneficial effects that:
1. a large amount of exploration engineering quantity is saved for rapidly plugging the water inrush channel, the time for exploring and determining the water inrush channel can be greatly shortened, and a decision basis is provided for a rapid decision plugging scheme;
2. the waste of water plugging aggregate and grouting material under the condition of flowing water can be greatly reduced;
3. the time for plugging water inrush can be greatly shortened, the engineering investment for controlling water inrush is reduced, and the fast production recovery is realized;
4. has obvious production, technical benefit, economic benefit and social benefit (workers can return to the original post for employment);
5. has very obvious application and popularization values;
6. is a great breakthrough of the coal mine water disaster prevention and control technology.
Drawings
FIG. 1 is a schematic plan view of a water outlet point and a radial hydraulic jet drilling location according to an embodiment of the present invention;
FIG. 2 is a schematic plan view of a water outlet point treatment radial hydraulic jet drilling arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic view of a vertical drilling arrangement of water outlet points according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a radial hydraulic jet drilling detection blind water burst channel according to an embodiment of the invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the present invention is not limited thereto.
Referring to fig. 1 to 4, the embodiment provides a method for quickly and accurately probing a hidden water inrush channel on a coal seam floor, and a radial hydraulic jet technology is used to quickly determine the hidden water inrush channel so as to create conditions for quickly blocking water.
The radial multidirectional small-aperture hydraulic perforation technology originates in 1992, is a mature technology formed in the process of oil and gas development in the United states, is introduced into China from the United states in 2010, and is still in an exploration test stage at present in China.
The radial hydraulic perforation technology changes the traditional drilling method that a mechanical drill bit grinds a target layer under the drive of power into water as a medium, and realizes effective perforation drilling on rocks and coal layers by utilizing the huge shooting force and peeling force of water molecules during the generation of ultrahigh pressure. The drilling is not only required to be fast in drilling speed, but also not stuck, and the operation efficiency is high. And breaking rock by using high-pressure water jet, and drilling a plurality of horizontal drill holes in the same stratum or different stratums of one drill hole along the radial direction. The pressure of the small crack is reduced during the drilling process, but the small crack still has the possibility of going forward, and the pressure is judged by the change of the pressure, and the large channel is certainly not drilled forward.
The working principle of the radial hydraulic perforation technology is as follows:
1. and (5) grinding and milling the opening on the sleeve at the designed position by using a drill bit.
2. Hydraulic rock breaking is carried out with the aid of high-pressure jets using hoses with jet drill bits.
3. A process technique for drilling multiple boreholes at different locations in a formation of interest.
4. Hydraulic jet drilling: the high-pressure pump pressurizes the solid-free drilling fluid, the coiled tubing is conveyed to a target layer in a drill hole, the drilling fluid passes through a jet drill bit, high pressure is converted into kinetic energy of high-speed jet flow to penetrate through a stratum, and finally a horizontal radial branch hole with the depth of 0-100m and the diameter of 25-76 mm is formed.
The process characteristics of the radial hydraulic perforation technology are as follows:
1. the bending radius is extremely short, and the diameter expansion is not needed, namely a special guide shoe is used;
2. using guide shoes to control direction (pinpointing using a gyroscope system);
3. the special spray head and the high-pressure hose are matched with the continuous oil pipe to ensure that the radial branch hole is straight;
4. radial drilling can be carried out on different layers of the same stratum or a single hole;
5. the method is suitable for coal beds, mud shales, carbonates and argillaceous siltstones.
The construction parameters of the radial hydraulic perforation technology are as follows:
1. one radial branch hole needs to be used for pulling up and pulling down the coiled tubing twice.
2. The diameter of the radial branch hole is 25-76 mm.
3. Penetration depth of 0-100m
4. The design temperature is below 120 ℃, and the pressure reaches 90MPa at most.
5. The maximum working borehole depth 3680m.
6. No solid phase drilling fluid, and filtering the liquid to be below 10 mu m.
Principle of radial hydraulic perforation technique:
1. carrying a drill bit on the sleeve at the designed position by using a continuous hose to mill and open a hole;
2. carrying out hydraulic rock breaking by using a hose with a jet drill bit and by means of high-pressure jet flow;
3. a process for drilling a plurality of 100m long radial branch holes in a formation.
Hydraulic jet drilling, wherein a high-pressure pump pressurizes a solid-free drilling fluid (the maximum pressure is 20000 psi), a continuous oil pipe is conveyed to the underground to a target layer, the drilling fluid is converted into kinetic energy of high-speed jet flow through a jet drill bit under high pressure, the kinetic energy penetrates through an oil layer, and finally a horizontal well hole with the depth of 0-100m and the diameter of 30-70mm is formed. The special spray head and the high-pressure hose are matched with the coiled tubing to ensure that the borehole is straight, and different layers of the same stratum or a single hole can be drilled in the radial direction.
The radial hydraulic perforation technology is tested and researched in the water damage treatment of the aquifer of Ordovician limestone in Wutong village group with energy peak in the year 2012 and 10 months, a better application effect is obtained, the pure drilling rate is 100m/h, 12.0 times of the fastest recording (8.3 m/h) rate of the current domestic multi-level branch holes, and only 1 hour is needed for drilling in the next to nearly kilometer. Generally, the water inrush position of a coal mine is about 30m from the front to the back of an exploitation line, therefore, after water inrush on a working face, vertical drilling is constructed at the water inrush point, and in a water-resisting rock stratum below a coal seam bottom plate, holes are formed in an all-around mode through a hydraulic perforation technology, so that the position of a water inrush channel can be rapidly and accurately obtained.
The method for quickly and accurately probing the hidden water inrush channel on the coal seam floor quickly determines the hidden water inrush channel based on a radial hydraulic jet method, creates conditions for quickly blocking water, and comprises the following steps:
step 1, analyzing hydrogeological conditions of water inrush of a working face, and determining the position of a vertical drilling hole (the hole can be deepened to an ultramarine stratum at the later stage and used as a hydrographic observation hole or a source-blocking drilling hole) for construction according to the water inrush position of the working face;
as shown in fig. 1 and shown, step 2, jet hole design: jet holes are selected to be arranged in a water-resisting rock stratum below a coal seam floor in an all-around mode according to vertical drilling, the horizontal length of the jet holes is 100m, and the hole spacing is calculated and determined by the fact that water inrush channels are distributed not to exceed 30m in front of and behind a working face mining line and the minimum construction radius of a mining area.
The working face distribution under the mine is shown in the attached figure 1, and comprises a goaf, a working face upper lane and a working face lower lane along the pushing and mining direction, and a track lane, a belt lane and an air return lane are sequentially arranged right ahead of the pushing and mining direction.
In the embodiment of fig. 2, 19 jet holes are arranged, which are respectively named as S1, S2, \8230ands 19, and each jet hole is spaced by 10m and is 30m away from the circle center of the circular distribution of the jet holes. The number, the interval, the radius and other parameters of the jet holes can be adjusted according to the hydrological condition of the coal bed.
As shown in fig. 3 and 4, step 3, selecting a construction layer, arranging jet drilling holes in a silty mud rock layer or a water-proof rock layer such as muddy siltstone and the like below a coal seam floor, and once a large crack is met, stopping forward drilling of the jet holes, wherein the position of the water inrush channel can be determined.
As shown in fig. 3, step 4, using the most advanced T130 or T200 u.s.truck-mounted drilling rig to quickly construct a vertical borehole, and before the vertical borehole is not cased, logging is performed to further determine the physical characteristics of the target layer, and the optimal interval is selected.
In fig. 3, the stratum is, from top to bottom, a topsoil layer, a pebble layer, a coarse sandstone, a fine sandstone, a siltstone, a coal layer, a siltstone, a limestone, a coal layer, a siltstone, an aluminum mudstone, and an earthenware limestone. Collapse columns, hidden water guide structures and related fractures of disaster water bursting channels are caused to commonly run through coal seams, siltstones, aluminum mudstones and Ordovician limestone. The radial hydraulic jet flow detection holes are horizontally arranged and are orthogonal to the sleeve and the vertical hole in the sleeve, and a bare hole with a certain length is arranged below the vertical hole.
And 5, evaluating the consolidation degree of the stratum, and selecting a proper drill bit and drilling fluid.
And 6, collecting the physical property of the rock, the thickness of the aquifer and production data, and selecting the most appropriate drilling mode.
As shown in fig. 4, step 7, ensures that the casing and formation are well consolidated to support the injection ports. As shown in figure 4, an oil pipe is arranged in the casing, and centralizers are symmetrically arranged between gaps between the oil pipe and the casing so as to ensure that the casing and the stratum are well consolidated to support the jet orifice. The inner part of the jet pipe is provided with a jet drill bit. The whipstock is symmetrically arranged on the outer side of the lower part of the centralizer, a small hole is drilled on the casing in the radial hole-forming hydraulic jetting operation, the windowing tool string can complete windowing in the direction perpendicular to the oil pipe through the whipstock, a plurality of bare holes can be formed in a whipstock cover on the cross section, and the whipstock cover is connected with the production string and the anchor through the bare holes.
As shown in fig. 1,2 and 4, step 8, according to the design, jet drilling is constructed in all directions, the preferential construction direction is determined according to the position of the water inrush point, other relevant water inrush information on the site and the hydrological conditions of the working surface, and then construction is carried out one by one at intervals until the position of the water inrush channel is found.
Implementation of this example:
1. a large amount of exploration engineering quantity is saved for rapidly plugging the water inrush channel, the time for exploring and determining the water inrush channel can be greatly shortened, and a decision basis is provided for a rapid decision plugging scheme;
2. the waste of water plugging aggregate and grouting material under the condition of flowing water can be greatly reduced;
3. the time for plugging water inrush can be greatly shortened, the engineering investment for controlling water inrush is reduced, and the fast production recovery is realized;
4. has obvious production, technical benefit, economic benefit and social benefit (workers can return to the original post for employment);
5. has very obvious application and popularization values;
6. is a great breakthrough of the coal mine water disaster prevention and control technology.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, the detailed description and the application scope of the embodiments according to the present invention may be changed by those skilled in the art, and in summary, the present disclosure should not be construed as limiting the present invention.
Claims (1)
1. A method for quickly and accurately probing a hidden water inrush channel of a coal seam floor is characterized by comprising the following steps:
step 1, analyzing hydrogeological conditions of water inrush of a working face, and determining the position of a vertical drilling hole for construction according to the water inrush position of the working face;
step 2, jet hole design is carried out;
step 3, selecting a construction position;
step 4, quickly constructing a vertical drilling hole, carrying out well logging to further determine the physical property characteristics of a target layer before the vertical drilling hole is not cased, and selecting an optimal layer section;
step 5, evaluating the consolidation degree of the stratum, and selecting a proper drill bit and drilling fluid;
step 6, collecting rock physical properties, aquifer thickness and production data, and selecting the most appropriate drilling mode;
step 7, ensuring that the sleeve and the stratum have better consolidation to support the jet orifice;
step 8, constructing jet drilling in all directions according to design, determining a preferred construction direction according to the position of a water inrush point, other relevant water inrush information on site and the hydrological conditions of a working surface, and constructing left and right at intervals until the position of a water inrush channel is found;
the later stage of the drilling in the step 1 can be extended to the position of the Ordovician limestone, and the drilling hole can be used as a hydrological observation hole or a source-plugging drilling hole;
the step 2 comprises the following steps: selecting jet holes in a water-resisting rock stratum below a coal seam floor in an all-around mode according to vertical drilling, wherein the horizontal length of the jet holes is 100m, and the hole spacing is calculated and determined by the fact that water inrush channels are distributed not to exceed 30m in the front and at the back of a working face mining line and the minimum construction radius of a mining area;
the step 3 comprises the following steps: the jet flow drilling hole is arranged in a silty mud rock stratum or a muddy silty sand water-proof rock stratum below the coal seam floor, once a large crack is met, the jet flow drilling hole stops drilling forwards, and the position is determined as the position of the water inrush channel;
the step 4 is implemented by adopting a T130 or T200 American truck-mounted drilling rig;
the step 4 comprises the following steps:
step 41, grinding and milling a hole on the sleeve at the designed position by using a drill bit;
step 42, performing hydraulic rock breaking by using a hose with a jet drill bit and by means of high-pressure jet flow;
step 43, drilling a plurality of boreholes at different locations in the target zone;
step 44, hydraulic jet drilling: the high-pressure pump pressurizes the solid-free drilling fluid, the coiled tubing is conveyed to a target layer in a drilled hole, the drilling fluid passes through a jet drill bit, high pressure is converted into kinetic energy of high-speed jet flow to penetrate through a stratum, and finally a radial branch hole is formed;
in the implementation of the step 44, the direction is controlled by using the guide shoes, the gyroscope system is used for accurate positioning, different layers of the same stratum or a single hole can be radially drilled, and the method is suitable for coal beds, mud shale, carbonate rocks and argillaceous siltstones;
the construction parameters for hydraulic jet drilling in step 44 include: one radial branch hole needs to be used for pulling up and pulling down the continuous oil pipe twice; the diameter of the radial branch hole is 25-76 mm; the penetration depth is 0-100m; the design temperature is below 120 ℃, and the pressure is up to 90MPa; the maximum working well depth 3680m; solid-phase-free drilling fluid, and filtering the fluid to be below 10 mu m;
step 44, hydraulic jet drilling, wherein a high-pressure pump pressurizes the solid-free drilling fluid, and the maximum pressure is 20000psi;
the step 7 comprises the following steps: an oil pipe is arranged in the casing, and centralizers are symmetrically arranged between gaps between the oil pipe and the casing so as to ensure that the casing and the stratum are well consolidated to support the jet orifice; the interior of the oil pipe is provided with an injection pipe, and the head of the injection pipe is provided with an injection drill bit; the whipstock is symmetrically arranged on the outer side of an oil pipe below the centralizer, a small hole is drilled on a casing pipe in radial hole-forming hydraulic jetting operation, a windowing tool string can complete windowing in the direction perpendicular to the oil pipe through the whipstock, a plurality of bare holes can be formed in a whipstock cover on the cross section, and the bare holes are connected with a production string and an anchor through the bare holes.
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| CN113374440B (en) * | 2021-05-28 | 2023-04-28 | 中煤科工集团西安研究院有限公司 | Rapid plugging method and construction method for water burst channel of hidden collapse column |
| CN113431495A (en) * | 2021-08-02 | 2021-09-24 | 任丘市华北油田诚信工业有限公司 | Ground gas treatment method integrating low-permeability technology and three technologies |
| CN114017016B (en) * | 2021-11-04 | 2024-02-13 | 中煤科工集团西安研究院有限公司 | Classifying method for hidden water guide channels of coal seam floor |
| CN114482994A (en) * | 2022-01-27 | 2022-05-13 | 冀中能源峰峰集团有限公司 | Method for selecting and accurately controlling horizon of water disaster treatment by coal mine exploration |
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| DE10008450C1 (en) * | 2000-02-23 | 2001-09-27 | Montan Tech Gmbh | Test drilling to assess the risk of a rock fall at a coal mine uses high pressure water jets to drill into the mine seam with measurements of at least one drilling parameter to be correlated with the level of danger |
| CN101429848B (en) * | 2007-11-06 | 2013-07-10 | 中国石油大学(北京) | Method and apparatus for hydraulic jet side drilling for radial branching borehole |
| CN102155187A (en) * | 2011-03-22 | 2011-08-17 | 上海宏睿油气田径向井技术服务有限公司 | Method for treating coal bed bottom plate karst water through hydraulic jetting and radial drilling |
| CN102312655A (en) * | 2011-09-02 | 2012-01-11 | 肇东华蓥油田钻采技术服务有限公司 | Radial hydraulic jetting drilling technology |
| CN103133028B (en) * | 2013-03-12 | 2015-04-15 | 河南理工大学 | Underground coal seam hydrofracture crack oriented developing method |
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