CN201896632U - Drilling well for gas drainage - Google Patents
Drilling well for gas drainage Download PDFInfo
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- CN201896632U CN201896632U CN2010206635138U CN201020663513U CN201896632U CN 201896632 U CN201896632 U CN 201896632U CN 2010206635138 U CN2010206635138 U CN 2010206635138U CN 201020663513 U CN201020663513 U CN 201020663513U CN 201896632 U CN201896632 U CN 201896632U
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- sieve tube
- wellhole
- tube segment
- screen casing
- diameter
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Abstract
The utility model discloses a drilling well for gas drainage, which comprises a sleeve section and a sieve tube section, wherein the sleeve section comprises a sleeve and a sleeve section well hole; the sieve tube section comprises a sieve tube and a sieve tube section well hole; the sieve tube is located in the sieve tube section well hole; the diameter of the sieve tube section well hole is larger than that of the sleeve section well hole; and a safe distance is kept between the outer wall of the sieve tube and the hole wall of the sieve tube section well hole. The method comprises the following steps: the sleeve section well hole is formed; the sleeve is placed in the sleeve section well hole and cementing a well; a drilling hole is formed through drilling under the sleeve section well hole and is expanded; the diameter of the drilling hole under the sleeve section well hole is expanded to be larger than the diameter of the sleeve section well hole, so that a sieve section well hole is formed; and the sieve tube is placed in the sieve section well hole and kept at a safe distance between the outer wall of the sieve tube and the hole wall of the sieve tube section well hole. According to the drilling well for gas drainage and the formation method, the sieve tube can retain a gas-outlet channel to an extent after being influenced by drainage, so as to ensure the smooth operation of gas drainage.
Description
Technical field
The utility model relates to drilling technique, relates in particular to a kind of gas pumping drilling well.
Background technology
At present, in oil or the coal bed gas well drilling engineering, most methods that adopt drilling well and underlying sleeve pipe.The basic process of gas pumping drilling well formation method is: drilling well, setting of casing is then cemented the well, and carries out aforesaid operations repeatedly, until reaching desired depth.After above technology is finished, below sleeve pipe, place the mash gas extraction screen casing, and in sleeve pipe, place the real pipe of mash gas extraction, finish whole gas pumping wellbore structure.
But, present gas pumping drilling well, employed bit diameter all need be less than the diameter of the sleeve pipe of putting on last stage because next stage holes, so the internal diameter of next stage pipe all is littler than the internal diameter of upper level pipe, all " telescopic effect " will take place (telescoping) inevitably, be that casing size reduces step by step, as telescopic telescope.Gas pumping drilling well for existing method forms detects according to the shaft bottom video recording, finds when hole depth 500m is following, and because of being subjected to mining influence, the screen casing distortion is serious.This is that shear strength and compressive strength are low because the screen casing wall cloth is equipped with a plurality of sieve apertures, and the rock stratum of easily being adopted the back movement and deformation is destroyed, causes the screen casing passage seriously blocked, has had a strong impact on normally carrying out of gas pumping.
Therefore, need a kind of new mash gas extraction boring with and forming method thereof, to avoid in the underground mining process that the destruction of screen casing is guaranteed carrying out smoothly of gas.
The utility model content
The utility model provides a kind of gas pumping drilling well, in order to reduce the damage and the clogging of screen casing in the boring.
The utility model embodiment provides a kind of gas pumping drilling well, comprises casing section and sieve tube segment, and casing section comprises sleeve pipe and casing section wellhole, and described sieve tube segment comprises screen casing and sieve tube segment wellhole; Described screen casing is positioned at described sieve tube segment wellhole, and the diameter of described sieve tube segment wellhole has safe distance greater than the diameter of described casing section wellhole between the hole wall of described screen casing outer wall and described sieve tube segment wellhole.
Aforesaid gas pumping drilling well, preferably, described safe distance is more than or equal to 200mm.
Aforesaid gas pumping drilling well, preferably, the diameter of described screen casing is 177.8mm, described safe distance is 242.2mm.
Aforesaid gas pumping drilling well, preferably, the wall thickness of described screen casing is 19.05mm.
Aforesaid gas pumping drilling well preferably, also comprises: be positioned at the end wellhole under the described sieve tube segment wellhole.
The gas pumping drilling well that the utility model provides; reserved certain space outside screen casing and between the borehole wall; can increase the water permeability that the gas section is long-pending and increase the coal top board goaf, coal seam of being exploited of crossing of interval that screen casing is positioned at; buffering or dodge the rock stratum in adopting back shearing, extrusion process to the sieve tube segment wellhole in the destruction of screen casing; protect screen casing effectively behind mining influence; can keep certain outlet passageway; help carrying out smoothly of gas pumping, reduce the damage and the obstruction of screen casing in the boring.
Description of drawings
The gas pumping drilling well that Fig. 1 provides for the utility model embodiment;
Fig. 2 and Fig. 3 are for forming the section of structure of gas pumping drilling process according to the utility model embodiment;
Fig. 4 draws the structural representation that the rock drill bit is expanded in the cave for the PDC double-vane;
Fig. 5 is for forming the method flow diagram of the utility model embodiment gas pumping drilling well.
The specific embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 comprises casing section and sieve tube segment for the gas pumping drilling well that the utility model embodiment one provides, and casing section comprises casing section wellhole 101 and sleeve pipe 102, and sieve tube segment comprises sieve tube segment wellhole 103 ' and screen casing 105.Wherein, screen casing 105 is positioned at sieve tube segment wellhole 103 ', and the diameter of sieve tube segment wellhole 103 ' has safe distance greater than the diameter of casing section wellhole 101 between the hole wall of screen casing 105 outer walls and sieve tube segment wellhole 103 '.So-called " safe distance " adopted for the coal seam can reduce the distance that screen casing is impacted when move the rock stratum, back.
Preferably, also comprise the end wellhole 104 that is positioned under the sieve tube segment wellhole.
Preferably, the distance of the hole wall of screen casing outer wall and sieve tube segment wellhole is more than or equal to 200mm.For example, when the diameter of screen casing was 177.8mm, the diameter of sieve tube segment wellhole should be 420mm, and promptly safe distance is 242.2mm.Such distance has been reserved certain outer annular space to screen casing; with buffering or dodge the rock stratum in adopting back shearing, extrusion process to the sieve tube segment wellhole in the destruction of screen casing; protect screen casing effectively behind mining influence, can keep certain outlet passageway, help carrying out smoothly of gas pumping.
Specifically describe the process that forms the gas pumping wellbore structure below.
At first, as shown in Figure 2, form casing section wellhole 101.The diameter of casing section wellhole 101 commonly used can be 350mm, and the degree of depth of casing section wellhole 101 can arrive 13-1 roof rock section, for example is 663m.Then, place sleeve pipe 102 in casing section wellhole 101, the specification of sleeve pipe 102 commonly used is: diameter is 273mm, and wall thickness is 10.06mm.Then, the annular gap between sleeve pipe 102 and the casing section wellhole 101 adopts the oil cementing technology to cement the well.The cement that is adopted during well cementation can be good magnificent G level high grade cement, can shorten the well cementation time like this, improves cementing quality, and strengthens the ability of sleeve pipe blocking-up Cenozoic layer of sand water greatly.
Then, as shown in Figure 3, under casing section wellhole 101, hole, form pre-sieve tube segment wellhole 103.Because technology, the diameter of the drill bit that the drill bit comparison casing section wellhole 101 that pre-sieve tube segment wellhole 103 is adopted adopts is little, and therefore, the diameter of pre-sieve tube segment wellhole 103 generally is not more than the diameter of casing section wellhole 101.For example, the diameter of pre-sieve tube segment wellhole 103 can be 245mm, and is littler than the normal dia 350mm of bore hole wellhole.Preferably, under pre-sieve tube segment wellhole 103, form end wellhole 104.The normal dia of end wellhole 104 can be 133mm, and the degree of depth is about 8m.End wellhole 104 is used to be assembled into the carg that well mash gas extraction process mesopore internal upper part drops, in case these foreign material stop up bottom sieve apertures, hinders the normal draining of boring and bleeds.
Then, as shown in Figure 1, pre-sieve tube segment wellhole 103 is carried out reaming, promptly the diameter to pre-sieve tube segment wellhole 103 expands, to form sieve tube segment wellhole 103 '.The diameter of sieve tube segment wellhole 103 ' is greater than the diameter of casing section wellhole 101, so that the distance of the hole wall of the outer wall of the screen casing of placing in sieve tube segment wellhole 103 ' in the subsequent technique 105 and sieve tube segment wellhole 103 ' is greater than 200mm.For example the diameter of sieve tube segment wellhole 103 ' can be 420mm.The technology of reaming can adopt PDC (composite polycrystal-diamond) double-vane to draw cave expansion rock drill bit.As shown in Figure 4, draw the structural representation that the rock drill bit is expanded in the cave for the PDC double-vane.This expansion rock drill bit comprises: bit body main shaft 21; Bit body main shaft 21 is connected with external control device (not shown); Bit body main shaft 21 middle parts are provided with wing fence; Wing fence comprises that the both sides of symmetrically arranged first fin 231 and second fin, 232, the first fins 231 and second fin, 232 bottoms are respectively arranged with at least one gang drill tooth 24.In the concrete working angles, utilize the liquid ejector principle, external control device control bit body main shaft 21 drives this and draws cave bottom expanding drill turn on pump after the soft rock interval turns round at a slow speed earlier, use double-vane that jet that certain pump pressure produces slowly opens wing fence i.e. first fin 231 and second fin 232, in double-vane rotary drilling process, first fin 231 and second fin 232 extending transversely gradually arrive level, at this moment, the external diameter of drawing cave bottom expanding drill smear metal rock reaches maximum value, draws the cave bottom expanding drill at the cornering stability height.
Next, in sieve tube segment wellhole 103 ', put into screen casing 105.The normal dia of screen casing 105 can be 177.8mm, correspondingly conventional wall thickness can be 13.72mm, at this moment, the distance of the hole wall of the outer wall of screen casing 105 and sieve tube segment wellhole 103 ' is 242.2mm, and such distance can reduce in the process of adopting rock to the damage of screen casing 105.So far, the gas pumping wellbore structure according to present embodiment completes.
Then, carry out follow-up technology, as insert real pipe above screen casing 105, the regular size of real pipe can be 177.8mm for diameter, and wall thickness is 9.19mm, and real pipe is cemented the well.Carry out technology for washing well at last, be that the Noncoring drill bit of 139mm dashes and to sweep cement paste residual in the shop and inwall mud skin for example with diameter, the degree of depth that surpasses the screen casing bottom towards the cleaning bottom of hole degree of depth, be pressed into an amount of sodium pyrophosphate solution then, soaked 24 hours, wash screen casing up and down with high-pressure spray, return clear water until the aperture.The time of well-flushing is generally greater than 48 hours.
Gas pumping wellbore structure according to present embodiment; outside screen casing, reserved certain space; can increase the water permeability that the gas section is long-pending and increase the coal top board goaf, coal seam of being exploited of crossing of interval that screen casing is positioned at; buffering or dodge the rock stratum in adopting back shearing, extrusion process to the sieve tube segment wellhole in the destruction of screen casing; protect screen casing again behind the mining influence effectively; can keep certain outlet passageway, help carrying out smoothly of gas pumping.
In technique scheme, can increase and be positioned at the following real pipe of ground 500m and the wall thickness of screen casing, the wall thickness of for example real pipe and screen casing is 19.05mm, manages in fact or the wall thickness 9.19mm of screen casing greater than traditional.The wall thickness that increases real pipe and screen casing helps real pipe and screen casing to strengthen non-deformability, to prevent since the extruding of rock stratum manage or destruction that screen casing causes real.
Fig. 5 is for forming the method flow diagram of gas pumping drilling well provided by the utility model.
In step 501, form the casing section wellhole.
In step 502, in the casing section wellhole, place sleeve pipe and well cementation.
In step 503, under the casing section wellhole, hole, and carry out reaming, the bore diameter under the casing section wellhole is extended to diameter greater than the casing section wellhole, to form the sieve tube segment wellhole.
In step 504, screen casing is put into the sieve tube segment wellhole, have a safe distance between the hole wall of screen casing outer wall and sieve tube segment wellhole.
Safe distance numerical value preferably more than or equal to 200mm.The diameter of screen casing can be 177.8mm, and safe distance is preferably 242.2mm.The wall thickness of screen casing can be 19.05mm.
Between the boring of step 503 and ream operation, can also comprise: continue boring downwards to form end wellhole.
Gas pumping drilling well according to said method formation; reserved certain space outside screen casing and between the borehole wall; can increase the water permeability that the gas section is long-pending and increase the coal top board goaf, coal seam of being exploited of crossing of interval that screen casing is positioned at; buffering or dodge the rock stratum in adopting back shearing, extrusion process to the sieve tube segment wellhole in the destruction of screen casing; protect screen casing effectively behind mining influence; can keep certain outlet passageway; help carrying out smoothly of gas pumping, reduce the coal seam and adopt damage and the obstruction of back screen casing.
It should be noted that at last: above embodiment only in order to the explanation the technical solution of the utility model, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a gas pumping drilling well comprises casing section and sieve tube segment, it is characterized in that, casing section comprises sleeve pipe and casing section wellhole, and described sieve tube segment comprises screen casing and sieve tube segment wellhole; Described screen casing is positioned at described sieve tube segment wellhole, and the diameter of described sieve tube segment wellhole has safe distance greater than the diameter of described casing section wellhole between the hole wall of described screen casing outer wall and described sieve tube segment wellhole.
2. gas pumping drilling well according to claim 1 is characterized in that described safe distance is more than or equal to 200mm.
3. gas pumping drilling well according to claim 1 and 2 is characterized in that, the diameter of described screen casing is 177.8mm, and described safe distance is 242.2mm.
4. gas pumping drilling well according to claim 1 and 2 is characterized in that, the wall thickness of described screen casing is 19.05mm.
5. gas pumping drilling well according to claim 1 and 2 also comprises: be positioned at the end wellhole under the described sieve tube segment wellhole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206635138U CN201896632U (en) | 2010-12-10 | 2010-12-10 | Drilling well for gas drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206635138U CN201896632U (en) | 2010-12-10 | 2010-12-10 | Drilling well for gas drainage |
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| Publication Number | Publication Date |
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| CN201896632U true CN201896632U (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206635138U Expired - Fee Related CN201896632U (en) | 2010-12-10 | 2010-12-10 | Drilling well for gas drainage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561998A (en) * | 2010-12-10 | 2012-07-11 | 淮南矿业(集团)有限责任公司 | Gas extraction bored well and forming method |
| CN102635389A (en) * | 2012-03-26 | 2012-08-15 | 山东科技大学 | Method for gas drainage from high-position roadway coal seam containing shielded soft rock |
| CN103953386A (en) * | 2014-03-12 | 2014-07-30 | 淮北矿业（集团）勘探工程有限责任公司 | Upstream-blocking and downstream-seepage method for extracting gas in mining area |
-
2010
- 2010-12-10 CN CN2010206635138U patent/CN201896632U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561998A (en) * | 2010-12-10 | 2012-07-11 | 淮南矿业(集团)有限责任公司 | Gas extraction bored well and forming method |
| CN102635389A (en) * | 2012-03-26 | 2012-08-15 | 山东科技大学 | Method for gas drainage from high-position roadway coal seam containing shielded soft rock |
| CN102635389B (en) * | 2012-03-26 | 2014-11-12 | 山东科技大学 | Method for gas drainage from high-position roadway coal seam containing shielded soft rock |
| CN103953386A (en) * | 2014-03-12 | 2014-07-30 | 淮北矿业（集团）勘探工程有限责任公司 | Upstream-blocking and downstream-seepage method for extracting gas in mining area |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20181210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |