CN204457462U - Well casing device - Google Patents
Well casing device Download PDFInfo
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- CN204457462U CN204457462U CN201420830000.XU CN201420830000U CN204457462U CN 204457462 U CN204457462 U CN 204457462U CN 201420830000 U CN201420830000 U CN 201420830000U CN 204457462 U CN204457462 U CN 204457462U
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Abstract
The utility model relates to a kind of well casing device, be arranged in well bore, comprise outer tube and be positioned at the inner sleeve of described outer tube inside, described outer tube and described inner sleeve are socketed mutually, and the internal diameter of described outer tube is greater than the external diameter of described inner sleeve, and be provided with annular spaces between the borehole wall of described outer tube and described well bore.Well casing described in the utility model adopts double-tube structure, after described double-jacket tube is finished using, well casing cutting equipment can be used directly to cut from the bottom of described outer tube, thus realizes recycling the major part of described sleeve pipe.
Description
Technical field
The utility model relates to a kind of coal underground gasification technology field, refers in particular to a kind of well casing device.
Background technology
Coal underground gasification technology mainly refers to that the solid fuels such as coal, coke or semicoke react with gasifying agent under high-temperature pressure or pressurized conditions, is converted into the process of gaseous product or a small amount of residue.Described gasifying agent is steam, air (or oxygen) or their gaseous mixture mainly.Coal gasification processes can be used for producing fuel gas, as industrial kiln gas or town gas, also can be used for manufacturing gaseous mixture, as the raw material of synthetic ammonia, synthesizing methanol and synthetic liquid fuel, therefore coal gasification is one of important technology of Coal Chemical Industry.
Coal underground gasification technology conventional at present generally realizes by beating coal bed drilling from ground in primitive coalbed, construction due to boring needs the aquifer through underground, in order to avoid the water in described aquifer is to seepage in boring, the well formed after needing to fix boring by cement, and Steel Casing is set in well, thus block aquifer and contacting in boring.In the cost structure of underground coal gasification(UCG) product, drilling cost occupies very high proportion, and sleeve pipe expense accounts for very large ratio in drilling cost.Described well casing refers to the steel pipe for supporting drilling shaft lining, with ensure drilling process carry out with completion after the normal operation of whole drilling well.In the real work of current underground coal gasification(UCG), drilling well, after completing mission, is generally in the states such as environmental protection observation, discarded or shutoff, and is seldom for recycling and reuse to sleeve pipe.One of subject matter that restriction well casing reclaims still does not have a kind of well casing structure not only having met technological requirement but also be beneficial to that well casing reclaims at present.
In order to overcome the problems referred to above, existing document provides vent-hole bi-sleeve heat exchanger for underground coal gasification and guard method, and the method is the boring of being beaten to coal seam by ground, forms well cementation fixing in the earth formation; Double-jacket tube is placed along the well cementation borehole wall in boring, described double-jacket tube comprises inner sleeve and outer tube, annular gap is provided with between inner sleeve and outer tube, the outer tube degree of depth is less than the inner sleeve degree of depth, weld with annular connecting plate between outer sleeve bottom with inner sleeve, weld water injection pipe outside inner sleeve, form double-jacket tube heat-exchanger rig; Inject normal-temperature water by water injection pipe, discharge hot water by the annular space of inner sleeve and outer tube or steam uses to ground, after gasification terminates, more than outer sleeve bottom, cut off inner sleeve, recovery inner sleeve and water injection pipe.Although above-mentioned document realizes reducing bushing temperature, be conducive to sleeve pipe and stablize, extend the application life of boring, reclaimed gas heat, improve the gasification thermal efficiency, and inner sleeve, water injection pipe are recyclable, reduce boring cost.But still there is following problem in said apparatus: the inner peripheral wall due to described outer tube is all socketed on the outer circle wall of described inner sleeve, when reclaiming inner sleeve, only can reclaim the part be mutually socketed with described outer tube, cause the limited amount reclaiming inner sleeve, moreover, the outer circle wall of described outer tube all needs to be fixed in boring, and the time of not only cementing the well is longer, and inefficiency.
Utility model content
For this reason, technical problem to be solved in the utility model is to overcome the sleeve pipe limited amount that reclaims when double-jacket tube described in prior art reclaims thus provides the well casing device that a kind of time short and major part of sleeve pipe of not only cementing the well can be recycled.
For solving the problems of the technologies described above, a kind of well casing device described in the utility model, be arranged in well bore, comprise outer tube and be positioned at the inner sleeve of described outer tube inside, described outer tube and described inner sleeve are socketed mutually, and the internal diameter of described outer tube is greater than the external diameter of described inner sleeve, between the borehole wall of described outer tube and described well bore, be provided with annular spaces.
In an embodiment of the present utility model, the bottom of described outer tube and the top of described inner sleeve are socketed mutually.
In an embodiment of the present utility model, the bottom of described outer tube is fixed in described well bore, and the position below described inner sleeve upper top is all fixed in described well bore.
In an embodiment of the present utility model, the bottom of described outer tube is provided with block piece in described annular spaces, and the position below described inner sleeve upper top is all fixed in described well bore.
In an embodiment of the present utility model, described block piece is plug.
In an embodiment of the present utility model, the position of described outer tube kiss the earth is provided with hardened face, and is provided with gap between described hardened face and described outer tube.
In an embodiment of the present utility model, described hardened face is provided with several water injection holes along the circumference of described outer tube, and described water injection hole communicates with described annular spaces.
In an embodiment of the present utility model, described hardened face is provided with the bracing frame supporting described outer tube.
In an embodiment of the present utility model, include hardened material in described hardened face, described hardened material is Reinforced Concrete Materials.
In an embodiment of the present utility model, the sclerosis area of described hardened face should be not less than the area of supporting rig needed for drilling well-head installation in well casing recovery.
Technique scheme of the present utility model has the following advantages compared to existing technology:
In well casing device of the present utility model, annular spaces is provided with between the borehole wall of described outer tube and described well bore, the outer circle wall of described outer tube need not all be fixed in described well bore, thus makes the well cementation time of described double-jacket tube short and can increase work efficiency; After described double-jacket tube is finished using, due to Existential Space between described outer tube and the borehole wall of described well bore, well casing cutting equipment therefore can be used directly to cut described outer tube, thus realize the recycling to described sleeve pipe.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is well casing device schematic diagram described in the utility model;
Fig. 2 is the top view of water injection hole described in the utility model;
Fig. 3 is the partial enlarged drawing of well casing device described in the utility model.
Detailed description of the invention
Embodiment one:
Shown in figure 1, well casing device described in the present embodiment, be arranged in well bore 10, comprise outer tube 11 and be positioned at the inner sleeve 12 of described outer tube 11 inside, described outer tube 11 and described inner sleeve 12 are socketed mutually, and the internal diameter of described outer tube 11 is greater than the external diameter of described inner sleeve 12, the bottom of described outer tube 11 and the top of described inner sleeve 12 are socketed mutually, and are provided with annular spaces 13 between the borehole wall of described outer tube 11 and described well bore 10.
Well casing device described in the utility model, be arranged in well bore 10, described well bore 10 successively by ground, aquifer 17 and roof 18 until go deep in subterranean coal 19, comprise outer tube 11 and be positioned at the inner sleeve 12 of described outer tube 11 inside, described outer tube 11 is arranged on the top of described well bore 10, described inner sleeve 12 is arranged on the below of described well bore 10, described outer tube 11 extends from ground to described aquifer more than 17, and the top of described outer tube 11 is positioned at more than ground; Described inner sleeve 12 extends from described aquifer more than 17 to described subterranean coal 19, and the internal diameter of described outer tube 11 is greater than the external diameter of described inner sleeve 12, described outer tube 11 and described inner sleeve 12 are socketed mutually, because described well casing adopts double-tube structure, therefore the recovery of described well casing is beneficial to, and the bottom of described outer tube 11 and the top of described inner sleeve 12 are socketed mutually, therefore the material of whole sleeve pipe is relatively less, suitably reduces cost; Be provided with annular spaces 13 between described outer tube 11 and the borehole wall of described well bore 10, the outer circle wall of described outer tube 11 need not all be fixed in described well bore 10, thus makes the well cementation time of described double-jacket tube short and can increase work efficiency; After described double-jacket tube is finished using, due to Existential Space between described outer tube 11 and the borehole wall of described well bore 10, therefore well casing cutting equipment can be used directly to cut from the bottom of described outer tube 11, thus realize recycling the major part of described outer tube 11.
In order to realize, described outer tube 11 and described inner sleeve 12 are mutually firm to be socketed in described boring 10, and the bottom of described outer tube 11 is fixed in described well bore 10, and the position below described inner sleeve 12 upper top is all fixed in described well bore 10.Particularly, all need to be fixed in described well bore 10 between described outer tube 11 bottom to more than 17 2 meters, described aquifer, the other parts of described outer tube 11 just can realize described outer tube 11 is fixed in well bore 10 without the need to being fixed in well bore 10.The bottom of described inner sleeve 12 is arranged in described subterranean coal 19, its particular location stretches between 1 meter to 3 meters of described subterranean coal 19 at described roof less than 14, the top of described inner sleeve 12 is positioned at, more than 17 4 meters, described aquifer, and from the position of 1 meter to 2 meters below described inner sleeve 12 top without the need to being fixed in described boring 10.
The position of described outer tube 11 kiss the earth is provided with hardened face 14, described hardened face 14 is by carrying out cure process formation to ground, hardened material is included in described hardened face 14, such as described hardened material is Reinforced Concrete Materials, by the sclerosis adopting steel concrete just can realize ground, wherein, the intensity of described steel concrete lower than C15, and should not meet the requirement that surface collapse does not occur in drilling well use and casing recovery process.Meanwhile, the sclerosis area of described hardened face 14 should be not less than well casing reclaim in supporting rig install at drilling well-head needed for area so that rigging up and be conducive to the recycling of described sleeve pipe.Wherein said drilling well refers in geological prospecting or drilling process, drives drilling tool to creep into underground, obtains the plant equipment of geologic information in kind, and Main Function drives the broken bottom rock of drilling tool, under enter or propose the drilling tool in well.
Gap is provided with between described hardened face 14 and described outer tube 11, namely described outer tube 11 can not contact with the steel concrete of hardened ground, described gap can make described outer tube 11 upper and lower flexible along described hardened face 14, particularly, between described hardened face 14 and described outer tube 11, the distance in gap is generally not more than 3cm.
As shown in Figures 2 and 3, described hardened face 14 is provided with several water injection holes 15 along the circumference of described outer tube 12, particularly, periphery along described outer tube 12 is evenly distributed with eight water injection holes 15, the diameter of described water injection hole is 30mm, and the horizontal range between adjacent two water injection holes is 150mm.Annular spaces 17 is provided with between described outer tube 11 and the borehole wall of described well bore 10, described water injection hole 15 communicates with described annular spaces 17, normal temperature aqueous water can be injected in described annular spaces 17 by described water injection hole 15, the object adding normal temperature aqueous water in described annular spaces 17 is for making described outer tube 11 uniform decrease in temperature in coal seam gasification, thus make the temperature of outer tube 11 be in less than 100 DEG C all the time, to reduce the too high adverse effect caused outer tube 11 of temperature.If described in the heat effects produced in coal seam gasification during outer tube 11; after injecting normal temperature aqueous water in described annular spaces 17; there is relatively uniform stroke change in described outer tube 11; and the stroke of described outer tube 11 can be reduced; to reduce the possibility that fracture occurs described outer tube 11; described outer tube 11 is played a protective role, thus extends the application life of described outer tube 11.
Because described outer tube 11 and described inner sleeve 12 are socketed mutually, the bottom of described outer tube 11 carries described inner sleeve 12, in order to reduce the weight that described outer tube 11 carries, described hardened face 14 is provided with the bracing frame 16 supporting described outer tube 11, support frame as described above 16 one end is positioned on described hardened face 14, the other end by reinforcement welding on the outer wall of described outer tube 11, the support strength of support frame as described above 16 meets the support demand of described outer tube 11, and do not affect stretching up and down of described outer tube 11, in order to ensure support strength, several bracing frames 16 can be set along described boring 10, and make described outer tube 11 relatively fixing in the position of well head.
Well casing device described in the present embodiment, after use terminates, to described outer tube 11 reclaims after can carrying out necessary process to borehole bottom, and the processing mode of wherein said borehole bottom can take the measure such as grout off or mud shutoff; The mode of the recovery of described outer tube 11 is: use well casing cutting equipment to critical part cutting of cementing the well bottom described outer tube 11, described outer tube 11 can be cut to position, more than 17 2 meters, described aquifer in bottom, described outer tube socket part 112, make the upper and lower separation in described boring 10 of described outer tube 11, after the upper and lower separation of described outer tube 11, the equipment such as rig, crane is brought into use to reclaim described outer tube 11 by root.
It should be noted that: well casing device described in the present embodiment can use as underground gasification furnace air inlet drilling well and drilling well of giving vent to anger.When well casing device uses as underground gasification furnace air inlet drilling well, should control the allowable stress that admission pressure is no more than the water seal of annular spaces 13 described in well casing, during as water seal height 300 meters, then admission pressure is not more than 3.0MPa; Described well casing device as underground gasification furnace give vent to anger drilling well use time, should note being supplement normal temperature aqueous water in described annular spaces 13 in time, to avoid causing water to evaporate owing to being heated in described annular spaces 13, thus ensure that described outer tube 11 is heated uniformly.
Rig type involved by the utility model need be determined according to the type of drilling well and drilling well size, generally selects HXY-5A, the rig of the models such as SPS2000.Described well casing, is generally the sleeve pipe that seamless steel pipe, petroleum casing pipe etc. can realize forcing shrinkage material; The diameter of callable outer tube 11 is generally not less than 50mm.
Well casing recovery process described in the utility model not only can be applied in underground coal gasification(UCG) field, also can be applied in the well casing recovery of other field as required, as oil exploitation drilling well, and water delivery well etc.
In addition, outer tube 11 can not be limited with the present embodiment with the socket mode of inner sleeve 12, and such as, in other embodiments, the latter half of outer tube 11 can be socketed in the first half of inner sleeve 12.
Embodiment two:
The present embodiment provides a kind of well casing device, it is the distortion on embodiment one basis, the mode be socketed in described boring 10 realizing described outer tube 11 in the present embodiment mutually firm from described inner sleeve 12 is different with embodiment one: described outer tube 11 is without the need to being fixed in described boring 10, but the internal diameter due to described outer tube 11 is greater than the external diameter of described inner sleeve 12, in order to prevent the gas produced in coal seam gasification process from being leaked in described boring 10 between described outer tube 11 and described inner sleeve 12, block piece is provided with between described outer tube 11 and described inner sleeve 12, described block piece can be plug or other sealing resistor, position now below described inner sleeve 12 upper top is all fixed in described well bore 10.Particularly, the bottom of described inner sleeve 12 is arranged in described subterranean coal 19, its particular location stretches between 1 meter to 3 meters of described subterranean coal 19 at described roof less than 14, the top of described inner sleeve 12 is positioned at, more than 17 4 meters, described aquifer, and from the position of 1 meter to 2 meters below described inner sleeve 12 top without the need to being fixed in described boring 10.
Well casing device described in the present embodiment is after use terminates, after carrying out necessary process to borehole bottom, the mode of the recovery of described outer tube 11 is: the critical localisation using well casing cutting equipment to be directly provided with described block piece from the bottom of described outer tube 11 cuts, thus realizes the recycling of described outer tube 11.
To sum up, well casing device described in the utility model has the following advantages:
1. in well casing device of the present utility model, annular spaces is provided with between the borehole wall of described outer tube and described well bore, the outer circle wall of described outer tube need not all be fixed in described well bore, thus makes the well cementation time of described double-jacket tube short and can increase work efficiency; After described double-jacket tube is finished using, due to Existential Space between described outer tube and the borehole wall of described well bore, well casing cutting equipment therefore can be used directly to cut described outer tube, thus realize the recycling to described sleeve pipe.
2. in an embodiment of well casing device of the present utility model, described well casing adopts double-tube structure, be conducive to the recovery of described well casing, and the top of the bottom of described outer tube and described inner sleeve is socketed mutually, therefore the material of whole sleeve pipe is relatively less, suitably reduces cost; Use well casing cutting equipment directly to cut from the bottom of described outer tube, thus realize recycling the major part of described sleeve pipe.
3. in an embodiment of well casing device of the present utility model, the position of described outer tube kiss the earth is provided with hardened face, described hardened face is by carrying out cure process formation to ground, simultaneously, described sclerosis area should be not less than well casing reclaim in supporting rig install at drilling well-head needed for area so that rigging up and be conducive to the recycling of described sleeve pipe.
4. in an embodiment of well casing device of the present utility model, described hardened face is provided with water injection hole, and described water injection hole communicates with described annular spaces, normal temperature aqueous water can be injected in described annular spaces by described water injection hole.If described in the heat effects produced in coal seam gasification during outer tube; after injecting normal temperature aqueous water in described space; there is relatively uniform stroke change in described outer tube; and the stroke of described outer tube can be reduced; to reduce the possibility that fracture occurs described outer tube; described outer tube is played a protective role, thus extends the application life of described outer tube.
Obviously, above-described embodiment is only for clearly example being described, the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain that the utility model creates.
Claims (10)
1. a well casing device, be arranged in well bore (10), comprise outer tube (11) and be positioned at the inner inner sleeve (12) of described outer tube (11), described outer tube (11) and described inner sleeve (12) are socketed mutually, and the internal diameter of described outer tube (11) is greater than the external diameter of described inner sleeve (12), it is characterized in that: be provided with annular spaces (13) between the borehole wall of described outer tube (11) and described well bore (10).
2. well casing device according to claim 1, is characterized in that: the bottom of described outer tube (11) and the top of described inner sleeve (12) are socketed mutually.
3. well casing device according to claim 2, it is characterized in that: the bottom of described outer tube (11) is fixed in described well bore (10), and the position below described inner sleeve (12) upper top is all fixed in described well bore (10).
4. well casing device according to claim 3, is characterized in that: the bottom of described outer tube (11) is provided with block piece in described annular spaces (13).
5. well casing device according to claim 4, is characterized in that: described block piece is plug.
6. well casing device according to claim 1, it is characterized in that: the position of described outer tube (11) kiss the earth is provided with hardened face (14), and is provided with gap between described hardened face (14) and described outer tube (11).
7. well casing device according to claim 6, it is characterized in that: described hardened face (14) is provided with several water injection holes (15) along the circumference of described outer tube (12), described water injection hole (15) communicates with described annular spaces (13).
8. well casing device according to claim 6, is characterized in that: described hardened face (14) is provided with the bracing frame (16) supporting described outer tube (11).
9. well casing device according to claim 6, is characterized in that: described hardened face includes hardened material in (14), and described hardened material is Reinforced Concrete Materials.
10. well casing device according to claim 9, is characterized in that: the sclerosis area of described hardened face (14) should be not less than the area of supporting rig needed for drilling well-head installation in well casing recovery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830000.XU CN204457462U (en) | 2014-12-23 | 2014-12-23 | Well casing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830000.XU CN204457462U (en) | 2014-12-23 | 2014-12-23 | Well casing device |
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| Publication Number | Publication Date |
|---|---|
| CN204457462U true CN204457462U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420830000.XU Active CN204457462U (en) | 2014-12-23 | 2014-12-23 | Well casing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894766A (en) * | 2018-08-27 | 2018-11-27 | 北京博锐新能科技有限公司 | A kind of straight well structure and casing recovery method |
| CN114378524A (en) * | 2021-12-29 | 2022-04-22 | 中国原子能科学研究院 | Sleeving method of inner sleeve and outer sleeve |
-
2014
- 2014-12-23 CN CN201420830000.XU patent/CN204457462U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894766A (en) * | 2018-08-27 | 2018-11-27 | 北京博锐新能科技有限公司 | A kind of straight well structure and casing recovery method |
| CN108894766B (en) * | 2018-08-27 | 2023-12-05 | 北京博锐新能科技有限公司 | Vertical well structure and casing recovery method |
| CN114378524A (en) * | 2021-12-29 | 2022-04-22 | 中国原子能科学研究院 | Sleeving method of inner sleeve and outer sleeve |
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| GR01 | Patent grant | ||
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Effective date of registration: 20170214 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang Xinyuan host new Austrian Science and Technology Park in Southern District Patentee before: ENN Coal Gasification Co., Ltd. |