CN114673469A - Semi-overlapping sleeve bag type gas drilling and sealing device - Google Patents
Semi-overlapping sleeve bag type gas drilling and sealing device Download PDFInfo
- Publication number
- CN114673469A CN114673469A CN202210230608.8A CN202210230608A CN114673469A CN 114673469 A CN114673469 A CN 114673469A CN 202210230608 A CN202210230608 A CN 202210230608A CN 114673469 A CN114673469 A CN 114673469A
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- bag
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- sealing device
- drilling
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- 238000007789 sealing Methods 0.000 title claims abstract description 28
- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 229920002635 polyurethane Polymers 0.000 claims abstract description 19
- 239000004814 polyurethane Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 12
- 239000003245 coal Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a semi-overlapped bagging type gas drilling and sealing device, which aims to improve gas extraction concentration, prevent gas accidents in a coal mine and improve the utilization efficiency of gas serving as clean energy. The technical scheme for solving the problem is that two materials of a pouring type polyurethane expansion body arranged in a flexible bag are used as power sources, a semi-overlapping sleeve bag formed by combining an inner bag and an outer bag is used as a main line, and a corresponding mechanism is arranged on the main line to control the expansion pressure of the sleeve bag and conduct closed loop on the expansion pressure.
Description
Technical Field
In the case of gas, people often think of gas accidents, particularly serious gas accidents, and the damage to lives and properties is unacceptable all over the society. On the other hand, gas is also called coal bed gas and is a clean energy source. The invention relates to a semi-overlapped sleeve bag type gas drilling and sealing device, which is used for preventing gas accidents, improving the gas collection capacity and the utilization rate and reducing the harm to the environment.
Background
Drilling, hole sealing and extraction, which are measures and normalized working flows for preventing gas accidents under coal mines, particularly high gas mines. In the three links, hole sealing is the key. The plugging of the gas drainage hole is different from the plugging of general holes and cavities, and is a process with stronger technical performance. The quality of hole sealing is directly related to the gas extraction concentration. It is necessary to briefly explain the specific structural features of the gas bore. (i) a stenosis. Typically 75mm-133mm in diameter dimension and 153mm in maximum diameter dimension. ② deep, generally, the punching depth is 50-100 meters. The hole sealing depth is not less than 8 m taking coal holes (sequential holes) as an example. And thirdly, both ends of the plugging section are open ends, injection plugging is adopted, the problem of a 'plug' at the deep part of the plugging section is also solved, otherwise, material leakage can be caused, and even an air inlet of the pumping and releasing pipe can be sealed, so that a waste reporting hole is caused. And fourthly, the cross section of the gas drilling hole is like two concentric circles. The inner circle is a drawing pipe, the outer circle is a drilling hole wall, and an annular space between two concentric circles is required to be plugged and is plugged to a solid coal bed.
The close and air-tight performance is the basic requirement for plugging the gas drainage hole. But it is really difficult to fall into practice. The problems existing in the prior hole sealing technology are mainly embodied in two aspects: the sealing body is ventilated and the circular seam is ventilated.
The circular seam means that the sealing body and two interfaces, namely the sealing body and the wall of the drainage pipe and the sealing body and the wall of the drill hole cannot be integrated substantially due to the reasons of retraction of the sealing body, insufficient expansion pressure and the like, and a gap is formed between the sealing body and the wall of the drainage pipe. Under the drainage negative pressure of at least 13 kPa, even the tiny gaps are increasingly large along with the continuous extraction, especially the outer annular gaps have increasingly strong air permeability, and the gas extraction concentration is increasingly low.
In the prior art, a polyurethane expansion body is used as a sealing body material and has the characteristics of expansibility and flowability. However, there are many misleading areas for the application of polyurethane expansion bodies in the field, and the defects are particularly prominent in the aspect of raw material proportioning and control means. For example, the reaction rate is too fast, resulting in too short a permissible working time, recoil, poor mechanical properties, etc.
In addition, whether the polyurethane foaming bag or the injection type polyurethane barrel is charged, the charging is influenced by various factors, particularly the defects of the formula and the temperature, and the charging has a plurality of defects in the aspects of controlling the density (expansion multiple), the reaction speed, the discharging position of the bagged product and the like. Foams have too high an open cell content and low density, causing shrinkage as the temperature is lowered. Under the calibrated drainage negative pressure condition of 13 kPa, the gas permeability causes the circulation and the channeling of gas inside and outside the drill hole, so that the gas extraction concentration is difficult to improve.
It is important to emphasize that the core problem of sealing is the control and use of expansion pressure. Control is a prerequisite for use. The sealing material or product has a common expansion characteristic, which is defined by the characteristic of sealing the object gas drilling hole. In the sealing operation, the expansion energy is not insufficient, but energy is lost or wasted or the sealing operation is not proper. The present invention provides a case for the control and conductance of the inflation pressure.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a semi-overlapped sleeve bag type gas drilling and sealing device.
A totally-enclosed flexible bag is made of aluminum plastic films and is an inner bag. The middle part of the inner bag is transversely isolated and is respectively filled with two materials of a double-component pouring type polyurethane expansion body. An outer bag is sleeved outside the inner bag to form a double-layer sleeved bag. One end of the inner bag facing the drilling hole is provided with an automatic opening discharging mechanism. When the expansion pressure of the inner bag is higher than the set pressure value, for example, the pressure reaches 1.6-1.8 kg/square centimeter, the mechanism is automatically opened. Allowing the material to flow out of the discharge port to reach the non-overlapped outer bag section position (see the second part in the attached drawing). The longitudinal dimension of the outer pouch is longer than the longitudinal dimension of the inner pouch, so that the sack is a semi-overlapping sack. The outer bag is made of a high polymer material which is airtight, strong in friction resistance and shear resistance and strong in glue hanging capability. The surface layer is covered with waterproof glue. One end of the outer bag towards the orifice is provided with a pressure control mechanism. The control mechanism controls the expansion pressure in the sleeve bag by controlling the overflow amount of the expansion material from the sleeve bag. When the expansion body meets the pressure control mechanism (see the fourth part in the attached drawing), the gas in the expansion body is exhausted, a small amount of expansion body is allowed to be exhausted, and importantly, the excessive material is prevented from being lost so as to ensure the expansion pressure of the whole bag.
The casting type polyurethane expansion body has the density of more than 40 kg/cubic meter and the expansion multiple of less than or equal to 20 times. The density of the foam used for heat preservation, packaging, elastic cushion and the like can be as low as 9.8 kilograms per cubic meter, and the expansion factor can be as high as 70 times. The defects of the expansion body in the aspects of density, retraction, reaction speed, expansion pressure and the like are not suitable for blocking the gas drainage hole.
The use of bags or bladders downhole in coal mines for plugging gas boreholes is not uncommon, but differs from the present invention. The polyurethane foaming bag is only equivalent to the inner bag' of the invention, and the discharging mode is different in characteristics. This is one such. Secondly, the technical problems solved by the sleeve bag of the invention are different. The prior art bag or pouch solves the technical problem that most bags or pouches are used as 'plugs'. So-called 'plugs', it is known in the art that both ends of the bore hole plugging section are open or free ends. Two ends of the plugging section must be provided with 'plugs' to prevent plugging materials from flowing out of a drilling hole, particularly flowing to the deep part of the drilling hole, so as to block an air inlet of the extraction pipe and cause a waste reporting hole. The 'two plugs' in the 'two plugs one injection' process means that two plugs are used. Thirdly, compared with the 'composite geomembrane bag' of the (resin hole packer) (application number 201510491408.8), the sleeve bag of the invention has different actual technical problems no matter the material, structure, function, property and solution of the bag.
A complete closed loop pressure control system and a closed loop pressure conduction system are the salient features of the present invention. According to the molecular reaction kinetics principle, two kinds of materials of the double-component pouring type polyurethane expansion body are used as power sources, the semi-overlapping type bagging is used as a main line, an automatic opening discharging mechanism on the inner bag and a pressure control mechanism on the outer bag are used as nodes, and the application of waterproof glue is adopted to control layer by layer and conduct layer by layer, and specifically the method comprises the following steps: two materials of the double-component pouring type polyurethane expansion body generate expansion pressure through field mixing reaction, and the two materials are subjected to closed-loop conduction layer by layer through the following links: the two materials of the pouring type polyurethane expansion body are mixed and expanded → an inner bag → (inward) drawing and releasing pipe → (outward) outer bag → waterproof glue → a drilling wall. The sealing body and the drilling hole wall are combined into a whole substantially, and the technical problem of air permeability of the sealing body and the circular seam is solved fundamentally.
The expansion pressure is the dynamic condition necessary to promote the integration of the multilayer composite seal and also to fully integrate the seal with the plugging object including the extraction tube, the bore hole wall and the narrow annular space between the two. Under the condition that the inner bag is not self-exploded and is not burst, the maximum or approximate maximum expansion pressure value is ensured. For example, when the expansion pressure (pressure) of the bag reaches 1.8 kg/cm, the automatic discharging mechanism at one end of the inner bag is automatically opened, so that the pressure increased by continuous expansion in the bag is relatively balanced with the pressure unloaded by the automatic discharging mechanism when the pressure is short. Thereby locking the expansion pressure. Therefore, under the constraint of the inner bag and the outer bag, the automatic discharging mechanism on the inner bag is used for 'releasing', and the pressure control mechanism on the outer bag is used for 'receiving', so that the release and the receiving properly control the loss of the expansion pressure.
The waterproof glue is used in the invention, and the bonding strength and the shear strength of the waterproof glue are far higher than those of a polyurethane foaming body. Under the pressure of the pouring type polyurethane expansion body, the waterproof glue can not only bond the sealing body and the wall of the drilled hole into a whole, but also enter fine surrounding rock cracks to bond the sealing body and the wall of the drilled hole into a whole. The effect of the top water operation performed on the ubiquitous water-containing holes and water-rich holes is outstanding. If other polyurethane materials are used for direct plugging, water is a catalyst, and the original structure of the catalyst is damaged when the catalyst meets water. Although the pouring type polyurethane expansion body also belongs to polyurethane, the pouring type polyurethane expansion body is protected by the inner bag and the outer bag, and the waterproof glue is not polyurethane but is directly used for making a crossing with a water-containing drill hole. The shearing resistance can meet the use requirement. In a word, the comprehensive efficiency formed by overlapping multiple technical factors of the product is enough to ensure that the high-efficiency stable state of the product is maintained in the repeated extraction process.
The beneficial effects of the invention are as follows: the structure of the product is particularly suitable for plugging a solid coal bed in a deep layer, and the gas extraction concentration is improved by more than 30 percent by the comprehensive effect of the technical factors. It is known that drilling gas extraction and gas accidents are inseparable, especially serious accidents such as coal and gas outburst. The gas accident can be restrained considerably; the gas extraction concentration is improved, so that the gas utilization is improved, and the pollution to the environment is reduced; the cost is obviously reduced, and the raw material of the product can be saved by more than 50 percent. The energy is not consumed, the using process is simple, the labor intensity is reduced, and the like.
Detailed Description
No complicated process operations are required on site. The middle isolation of the inner bag is opened manually (or by a simple tool), the two-component materials in the bag are mixed, the protective film of the waterproof adhesive is taken down, and the protective film, the connecting pipe and the hole are simultaneously inserted.
Drawings
FIG. 1 is a longitudinal section: firstly, an inner bag, an outer bag, an automatic opening and discharging mechanism at the end part of the inner bag, a pressure control mechanism at the end part of the outer bag, a pipe drawing, a drilling hole, a waterproof rubber layer and surrounding rock
FIG. 2 is a cross-sectional view: drawing and releasing the pipe, expanding the inner bag, waterproof glue layer, seamless overlapping between the pipe wall and the inner bag, seamless overlapping between the inner bag and the outer bag, and surrounding rock.
Claims (5)
1. A semi-overlapped bag-type gas drilling and sealing device is characterized in that a fully-closed flexible bag, namely an inner bag, is wound on a drawing and placing pipe, an isolation device is transversely arranged in the middle of the bag and is respectively filled with two materials of a two-component pouring polyurethane expansion body, the other bag, namely an outer bag, sleeved on the outer surface of the bag is longer than the inner bag in the longitudinal dimension, and the outer bag is covered with a layer of waterproof glue.
2. The semi-overlapping sleeve bag type gas drilling and sealing device as claimed in claim 1, wherein the expansion factor of the materials in the inner bag is less than or equal to 20 times, and the density is more than 40 kg/cubic meter.
3. The apparatus of claim 1, wherein the inner bag has an automatic opening and discharging mechanism at its end facing the drilling hole.
4. The apparatus of claim 1, wherein a pressure control mechanism is provided at an end of the outer bag facing the drilling opening.
5. The semi-overlapped bagging-type gas drilling and sealing device as claimed in claim 1, wherein the outer bag is made of a high polymer material which is air-impermeable, wear-resistant, shear-resistant and adhesive-coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210230608.8A CN114673469A (en) | 2022-03-06 | 2022-03-06 | Semi-overlapping sleeve bag type gas drilling and sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210230608.8A CN114673469A (en) | 2022-03-06 | 2022-03-06 | Semi-overlapping sleeve bag type gas drilling and sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114673469A true CN114673469A (en) | 2022-06-28 |
Family
ID=82072955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210230608.8A Pending CN114673469A (en) | 2022-03-06 | 2022-03-06 | Semi-overlapping sleeve bag type gas drilling and sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114673469A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007138430A (en) * | 2007-10-17 | 2009-04-27 | Сергей Евгеньевич Казаков (RU) | METHOD FOR RESTORING SEALING AND THERMAL INSULATION OF INTERPANEL SEAMS AND WALL PANELS |
| CN103216249A (en) * | 2013-04-02 | 2013-07-24 | 中国矿业大学 | Waterproof support method of water sump of water-swellable soft rock of underground coal mine |
| CN103883276A (en) * | 2014-02-18 | 2014-06-25 | 六盘水师范学院 | Simple, economic and efficient coal seam gas drainage drilling hole sealing method |
| CN104912574A (en) * | 2015-06-29 | 2015-09-16 | 中南大学 | A tunnel lining leakage water treatment method |
| CN204738781U (en) * | 2015-04-17 | 2015-11-04 | 河南省瓦安矿用设备有限公司 | Take out and put certainly bloated hole packer of bag for gas |
| CN106284425A (en) * | 2016-08-15 | 2017-01-04 | 中国二十二冶集团有限公司 | Basement in high rise building roof deformation seam water proof structure construction method |
| CN106437603A (en) * | 2015-08-09 | 2017-02-22 | 阜新贝格科技有限公司 | Resin hole sealing device |
| CN106468153A (en) * | 2015-08-15 | 2017-03-01 | 辽宁兰特科技发展有限公司 | Wall rock drill-hole high-pressure fluid locks pressure system |
| RU2672899C1 (en) * | 2018-01-09 | 2018-11-20 | Общество с ограниченной ответственностью "Партнер" | Method for reducing gas permeability of a coal massif |
-
2022
- 2022-03-06 CN CN202210230608.8A patent/CN114673469A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007138430A (en) * | 2007-10-17 | 2009-04-27 | Сергей Евгеньевич Казаков (RU) | METHOD FOR RESTORING SEALING AND THERMAL INSULATION OF INTERPANEL SEAMS AND WALL PANELS |
| CN103216249A (en) * | 2013-04-02 | 2013-07-24 | 中国矿业大学 | Waterproof support method of water sump of water-swellable soft rock of underground coal mine |
| CN103883276A (en) * | 2014-02-18 | 2014-06-25 | 六盘水师范学院 | Simple, economic and efficient coal seam gas drainage drilling hole sealing method |
| CN204738781U (en) * | 2015-04-17 | 2015-11-04 | 河南省瓦安矿用设备有限公司 | Take out and put certainly bloated hole packer of bag for gas |
| CN104912574A (en) * | 2015-06-29 | 2015-09-16 | 中南大学 | A tunnel lining leakage water treatment method |
| CN106437603A (en) * | 2015-08-09 | 2017-02-22 | 阜新贝格科技有限公司 | Resin hole sealing device |
| CN106468153A (en) * | 2015-08-15 | 2017-03-01 | 辽宁兰特科技发展有限公司 | Wall rock drill-hole high-pressure fluid locks pressure system |
| CN106284425A (en) * | 2016-08-15 | 2017-01-04 | 中国二十二冶集团有限公司 | Basement in high rise building roof deformation seam water proof structure construction method |
| RU2672899C1 (en) * | 2018-01-09 | 2018-11-20 | Общество с ограниченной ответственностью "Партнер" | Method for reducing gas permeability of a coal massif |
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