CN102003169A - Method for repairing accident well of coal bed methane multi-branch horizontal well - Google Patents
Method for repairing accident well of coal bed methane multi-branch horizontal well Download PDFInfo
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- CN102003169A CN102003169A CN2010102862762A CN201010286276A CN102003169A CN 102003169 A CN102003169 A CN 102003169A CN 2010102862762 A CN2010102862762 A CN 2010102862762A CN 201010286276 A CN201010286276 A CN 201010286276A CN 102003169 A CN102003169 A CN 102003169A
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Abstract
The embodiment of the invention discloses a method for repairing an accident well of a coal bed methane multi-branch horizontal well. The method comprises the following steps of: milling a fish in a drainage and mining vertical well so as to ensure that a subsequent drainage and mining pump can be put into the well; determining a new target point at a position which is more than 1 meter above a communication point between the original horizontal wall and the hole of the drainage and mining vertical well; setting a side drilling point on a straight well section of the horizontal well; and drilling a horizontal section of a new horizontal well by taking the side drilling point as a start point, wherein the horizontal section of the new horizontal well is more than 1 meter higher than the horizontal section of the original horizontal well, the horizontal projection of the track water of the horizontal section of the new horizontal well is arch-shaped so as to be deviated from a part right above the horizontal section of the original horizontal well, and the new horizontal well passes through the new target point. In the embodiment of the invention, the horizontal well is drilled above the original horizontal well once again, so that the new horizontal well and the original horizontal well are not positioned on the same horizontal plane and the borehole of the new horizontal well is not affected even though the fish falls into the hole of the drainage and mining vertical well. Therefore, the fish in the original horizontal well is avoided and the influence caused by the blockage of the borehole by the fish is avoided.
Description
Technical field
The present invention relates to the coal-bed gas exploitation field, more particularly, relate to a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well.
Background technology
In the process of wellbore construction, down-hole accident can might take place in coal bed gas multilateral well, horizontal well or U type butt shaft; In down-hole accident, the down-hole bit freezing may cause drilling tool to be buried to stay in the well that has been drilled to and form fish.In this area, after fish is meant that accident treatment finishes, because of a variety of causes cause stay in the well such as drilling rod, drill collar, drill bit or salvage all kinds of instruments etc. of usefulness.Because the fish in the well will be stopped up well fully, thereby, the further construction of coal bed gas well and follow-up gas production can be influenced.
At present, at the solution behind the fish be, the judgement fish is adopted the distance in straight well cave apart from row earlier, when distance long enough (being meant more than at least 50 meters generally speaking), when not influencing sidetracking, can carry out sidetracking in the anterior position of fish, thereby the accident point of walking around the fish place is finished follow-up coal seam drilling depth.Thereby making that completed row adopts straight well in the accident well can continue to utilize, the utilization that completed horizontal well also can part.
But in some down-hole accident, fish can stay horizontal well and row adopts connection place in the straight well, that is to say the cavern location that fish can the row of staying be adopted straight well.At this moment, do not have the space because row adopts between straight well and the fish, can't carry out sidetracking, generally speaking, this accident well will engineering be scrapped, thereby causes great loss.And the row after engineering is scrapped adopts straight well and horizontal well all can't utilize probably again, so also need to arrange the construction again of adopting straight well and horizontal well, so also can prolong whole construction period.
In sum, when the position of fish just for row adopts in the straight well cave, in the time of can't carrying out sidetracking, continuation utilization that can't realization accident well in the prior art, thereby caused serious economy loss.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well, adopts straight well well cave and can't carry out sidetracking the time, continues to utilize the purpose of accident well when fish falls into to arrange realizing.
The embodiment of the invention is achieved in that
A kind of means to save the situation of coal bed gas multi-branched horizontal well accident well comprises step:
S11, milling row adopts the fish in the straight well, described fish is pushed away row adopt the straight well well or described fish is milled the row of pushing away of having no progeny adopt the straight well well to reserve the space that is lowered to the pump string;
S12, adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
S13, set side tracking point in horizontal well straight well section;
S14, be that starting point is drilled with new height well horizontal segment with described side tracking point; Described new height well horizontal segment is higher than the horizontal segment of former horizontal well more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
Preferably, in embodiments of the present invention, describedly row is adopted the instrument that fish in the straight well carries out milling install junk mill additional or mill awl for adopting drilling rod.
Preferably, in embodiments of the present invention, when described horizontal well inclination section when sealing admittedly without setting of casing, also comprise step before the step S14:
Row is adopted the straight well cave fill up sand and use drilling tool will hit tight sand, or, adopt the kickoff point (KOP) of horizontal well and row and to use packer to implement packing between the straight well cave;
To the horizontal well well sealing below the described side tracking point.
Preferably, in embodiments of the present invention, when described horizontal well inclination section sealed admittedly for the process setting of casing, step S13 and step S14 specifically comprised:
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
Two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; To the horizontal well well sealing below the described side tracking point position;
With described side tracking point is that starting point is drilled with new height well horizontal segment; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
Preferably, in embodiments of the present invention, described solid envelope is sealed admittedly for adopting cement.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than 2. to 4 meters of former horizontal well horizontal segments.
Preferably, in embodiments of the present invention, after described new height well horizontal segment passed novel targets, the angle in the orientation of the horizontal segment track of new height well and former horizontal well was greater than 8 degree.
Preferably, in embodiments of the present invention, described angle is 10 to 20 degree.
From above-mentioned technical scheme as can be seen, in the embodiment of the invention by above the previous level well, being drilled with the horizontal well horizontal segment again, make new height well horizontal segment and previous level well horizontal segment not on same horizontal plane, even so the position of fish among row adopts the straight well cave, also can not influence the well of new height well.Thereby got around former row and adopted fish in the straight well, avoided fish to stop up the influence that well causes.
And the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby avoided in the work progress of new height well or be drilled with finish after, if former horizontal well caves in, can influence the situation of the construction or the use of new height well.
Utilizing original row to adopt in the embodiment of the invention has avoided the influence that row adopts the fish in the straight well cave effectively, has avoided row to adopt scrapping of straight well and horizontal well under the situation of straight well and horizontal well.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the means to save the situation flow chart of the accident of coal bed gas multi-branched horizontal well described in embodiment of the invention well;
Fig. 2 is the means to save the situation flow chart of the accident of coal bed gas multi-branched horizontal well described in further embodiment of this invention well;
Fig. 3 is the means to save the situation flow chart of the accident of coal bed gas multi-branched horizontal well described in further embodiment of this invention well.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
In the practice of construction process, some down-hole accident and stay fish be just in time dropped on row adopt in the cave of straight well, at this moment, job practices of the prior art can't be carried out sidetracking and be walked around fish.To utilize the accident well in order continuing in this case, to avoid loss, the embodiment of the invention provides a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well, comprises step:
S11, milling row adopts the fish in the straight well, described fish is pushed away row adopt the straight well well or described fish is milled the row of pushing away of having no progeny adopt the straight well well to reserve the space that is lowered to the pump string;
In embodiments of the present invention, because the position of fish has been stuck in row and has adopted in the straight well cave, in order not influence the follow-up use that row adopts straight well, at first to carry out milling to the fish that the row of being stuck in adopts in the straight well, concrete, in practical operation, can be to use external diameter greater than the follow-up junk mill milling fish that is lowered to pump string maximum gauge, also can be to mill taper thread grinding to mill fish, and fish is fallen in the part milling that row adopts the straight well well, perhaps, make fish under the active force of junk mill, depart from row and adopt the straight well well.Locate to put in the cave repeatedly to put by milling tool, up to not being hampered and the appearance of side scratch phenomenon, recovery is unobstructed thereby the straight well well is adopted by the row of making.
S12, adopt on the connectivity points of the former cave of straight well more than 1 meter the position former horizontal well and row and determine novel targets;
The embodiment of the invention is drilled with the horizontal segment of horizontal well by utilizing the Vertical Well section of original horizontal well again in described Vertical Well section, and walks around the fish position and realize continuation utilization to original accident well.Owing to leave fish with the place of connection that row adopts straight well in the horizontal well well, if the new height well is in same horizontal plane with former horizontal well again, can can't construct because of stopping of fish, so in the embodiment of the invention, adopt on the connectivity points of the former cave of straight well more than 1 meter the position former horizontal well and row and determine novel targets; The novel targets here is meant that the well that is drilled with horizontal well is adopted row needs the position passed through in the straight well.For fear of of the influence of former connectivity points to new height well well, in embodiments of the present invention, also set the safe distance of novel targets and former connectivity points, at least to guarantee more than 1 meter, collapse thereby avoid causing, and then influence is constructed because the coal seam support force between new height well and the original cave is too small.
S13, adopt the straight well section at horizontal well array and set side tracking point;
Owing in the embodiment of the invention, need be drilled with well again, because the position of new horizontal well horizontal segment need be above the horizontal segment of former horizontal well, so new side tracking point also need be above the kickoff point (KOP) of horizontal well Central Plains in the straight well section of previous level well.
S14, be that starting point is drilled with new height well horizontal segment with described side tracking point; Described new height well horizontal segment is higher than the horizontal segment of former horizontal well more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that described new height well horizontal segment track ground horizontal projection is; Described new height well passes described novel targets;
By above the previous level well, being drilled with horizontal well again, make new height well and previous level well not on same horizontal plane, so, also can not influence the well of new height well even the position of fish is in row adopts among the straight well cave.Thereby got around and arranged the fish of adopting in the straight well, avoided fish to stop up the influence that well causes.
In embodiments of the present invention, in the work progress of new height well or be drilled with finish after, cave in as former horizontal well, cross when near from former horizontal well when the new height well spacing, can influence the construction or the use of new height well, such as related cave in etc. that can cause the new height well.So the new height well need maintain a certain distance to avoid influence with former horizontal well; In embodiments of the present invention, safe distance can be set at, at least will be more than 1 meter near the cave, other well section keeps 2.5 meters space length at least.
Because the vertical discrepancy in elevation between two wells and the angle of deviation have determined the space length of the two, distance is big more, and the interference between two wells is just more little.In order better to avoid the influence of former horizontal well, the height of new height well horizontal segment is not only than former horizontal well horizontal segment height, but also to avoid directly over the horizontal segment of former horizontal well, concrete method can be, the horizontal projection of the track of new horizontal well well is arc, promptly beginning from side tracking point and the previous level well section direction that staggers, promptly, with the direction of the accident well section that leaves fish an angle is arranged so that new height well horizontal segment well as far as possible not directly over the horizontal segment of former horizontal well, the horizontal segment well of new height well is again with the line tracking wraparound of a bow and pass novel targets then.Can avoid the horizontal segment of former horizontal well to collapse so effectively, also reduce the magnetic interference of fish for measurement while-drilling instrument in the new well drilling tool to the influence of new height well well.
In embodiments of the present invention, again be drilled with horizontal well by the above position of adopting the straight well cave original row who leaves fish, and the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby avoided the influence that row adopts fish in the straight well cave under the situation of straight well and horizontal well effectively, avoided row to adopt scrapping of straight well and horizontal well utilizing original row to adopt.
In actual job, down-hole accident sometimes takes place is the horizontal well inclination section not setting of casing seal admittedly under the situation, this moment, concrete construction sequence can be specially as shown in Figure 2:
S21, milling row adopts the fish in the straight well, described fish is pushed away row adopt the straight well well or described fish is milled the row of pushing away of having no progeny adopt the straight well well to reserve the space that is lowered to the pump string;
S22, adopt former horizontal well and row and to determine novel targets on the connectivity points of the former cave of straight well more than 1 meter;
In embodiments of the present invention, step S21 and step S22 and step S11 illustrated in fig. 1 and step S12 are similar, do not repeat them here.
S23, row is adopted the straight well cave fill up sand, or, adopt the kickoff point (KOP) of horizontal well and row and to use packer to implement packing between the straight well cave;
Because in the embodiment of the invention, the well of horizontal well does not have setting of casing to seal admittedly, if can adopt cement admittedly to seal as the solid front cover this moment, because the well of previous level well also is in connected state, thereby cement may flow along the well of previous level well when sealing admittedly, the height of the solid water shutoff mud of influence so not only, and the cement that straight well is adopted by the row of inflow also may sealing need the row of sealing to adopt a certain section of straight well.
For this reason, in embodiments of the present invention, before solid water shutoff horizontal well, by in advance sand being filled up in former cave, thereby limited the entry range of cement, and then, not only guaranteed the height of solid water shutoff mud in horizontal well, and, avoid cement to enter row and adopted the horizontal segment of straight well and back, cave.
In order to play the effect of better obstruct cement, in addition, also be in order to form certain support force, thereby avoid former cave to cave in former cave; Preferably, in embodiments of the present invention, in described process of former cave being filled up sand, use drilling tool that sand is hit tight.More firm, can also utilize known technology to increase isolation facility such as packer etc. in the front, cave to increase isolation effect and intensity.
S24, set side tracking point in horizontal well straight well section;
Owing in the embodiment of the invention, need be drilled with well again in the straight well section of previous level well, because the position of new horizontal well horizontal segment need be above the horizontal segment of former horizontal well, so, the straight well section that new side tracking point also need be in horizontal well.Further, this side tracking point is on former kickoff point (KOP).
S25, be locked in the following horizontal well well of described side tracking point;
Isolate for the support strength that increases sidetracking with former horizontal hole, need carry out solid envelope, in embodiments of the present invention, can use cement that former horizontal well well is filled up to seal former horizontal well well admittedly former horizontal well well.
Owing among the step S23, just in advance sand has been filled up in former cave, or, carried out packing, thus the cement flows that ought seal former horizontal well well admittedly be intercepted to understanding before row adopts the straight well cave, thereby can well guarantee the height of cement.
S26, be that starting point is drilled with new height well horizontal segment with described side tracking point; Described new height well horizontal segment is higher than the horizontal segment of former horizontal well more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
Because the step S14 among step S26 and the embodiment illustrated in fig. 1 is similar, so, do not repeat them here.
In actual job, the horizontal well inclination section that down-hole accident sometimes takes place when setting of casing seals admittedly, this moment concrete construction sequence as shown in Figure 3, be specially:
S31, milling row adopts the fish in the straight well, described fish is pushed away row adopt the straight well well or described fish is milled the row of pushing away of having no progeny adopt the straight well well to reserve the space that is lowered to the pump string;
S32, adopt former horizontal well and row and to determine novel targets on the connectivity points of the former cave of straight well more than 1 meter;
In embodiments of the present invention, step S31 and step S32 and step S11 illustrated in fig. 1 and step S12 are similar, do not repeat them here.
S33, in the straight well section lower end of horizontal well or inclination section be lowered to packer and implement packing;
In the embodiment of the invention,,, make the straight well section of horizontal well and inclination section, Connectivity Section and the row of horizontal well adopt the realization isolation of straight well cave so can use packer in sleeve pipe, to set because horizontal well has been finished setting of casing.By straight well Duan Yuyuan horizontal segment is isolated, thereby can when the original horizontal well straight well section of recycling, not be subjected to the influence of previous level section.
S34, two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; To the horizontal hole sealing below the described side tracking point position;
Because in the embodiment of the invention, need be drilled with the horizontal segment well again in the straight well section of previous level well, so, need open outside the part cutting and proposition well of free section in the sleeve pipe, two in order to expose the open hole borehole wall that can be drilled with new height section deflecting the boring section;
Because two to drive sleeve pipe be metal material, two the latter halfs of driving sleeve pipe produce magnetic disturbance to the drill bit in the follow-up construction in the horizontal well for fear of staying, so apart from the position of described cut point more than 20 meters side tracking point is set in horizontal well straight well section.Then, the construction of sidetracking can also adopt the described side tracking point of cement sealing position to get final product with the section of going into the well for convenience.
S35, be that starting point is drilled with new height well horizontal segment with described side tracking point; Described new height well horizontal segment is higher than the horizontal segment of former horizontal well more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
Because the step S14 among step S35 and the embodiment illustrated in fig. 1 is similar, so, do not repeat them here.
In sum, the embodiment of the invention is by being drilled with the horizontal well horizontal segment again above the previous level well, the position of fish make new height well horizontal segment and previous level well horizontal segment not on same horizontal plane, so even among row adopts the straight well cave, also can not influence the well of new height well.Thereby got around former row and adopted fish in the straight well, avoided fish to stop up the influence that well causes.
And the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby avoided in the work progress of new height well or be drilled with finish after, if former horizontal well caves in, can influence the situation of the construction or the use of new height well.
Utilizing original row to adopt in the embodiment of the invention has avoided the influence that row adopts the fish in the straight well cave effectively, has avoided row to adopt scrapping of straight well and horizontal well under the situation of straight well and horizontal well.
Each embodiment adopts the mode of going forward one by one to describe in this manual, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. the means to save the situation of a coal bed gas multi-branched horizontal well accident well is characterized in that, comprises step:
S11, milling row adopts the fish in the straight well, described fish is pushed away row adopt the straight well well or described fish is milled the row of pushing away of having no progeny adopt the straight well well to reserve the space that is lowered to the pump string;
S12, adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
S13, set side tracking point in horizontal well straight well section;
S14, be that starting point is drilled with new height well horizontal segment with described side tracking point; Described new height well horizontal segment is higher than the horizontal segment of former horizontal well more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
2. according to the described method of claim 1, it is characterized in that, describedly row is adopted the instrument that fish in the straight well carries out milling install junk mill additional or mill awl for adopting drilling rod.
3. according to the described method of claim 1, it is characterized in that, when described horizontal well inclination section when sealing admittedly without setting of casing, also comprise step before the step S14:
Row is adopted the straight well cave fill up sand and use drilling tool will hit tight sand, or, adopt the kickoff point (KOP) of horizontal well and row and to use packer to implement packing between the straight well cave;
Inclination section sealing to the horizontal well well below the described side tracking point.
4. according to the described method of claim 1, it is characterized in that when described horizontal well inclination section sealed admittedly for the process setting of casing, step S13 and step S14 specifically comprised:
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
Two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; To the horizontal hole sealing below the described side tracking point position;
With described side tracking point is that starting point is drilled with new height well horizontal segment; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection track of described new height well horizontal segment track is; Described new height well passes described novel targets.
5. according to claim 3 or 4 described methods, it is characterized in that described solid envelope is sealed admittedly for adopting cement.
6. according to the described method of claim 5, it is characterized in that described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
7. according to the described method of claim 6, it is characterized in that described new height well horizontal segment is higher than 2 to 4 meters of former horizontal well horizontal segments.
8. according to the described method of claim 1, it is characterized in that after described new height well horizontal segment passed novel targets, the angle in the orientation of the horizontal segment track of new height well and former horizontal well was greater than 8 degree.
9. described according to Claim 8 method is characterized in that, described angle is 10 to 20 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010286276 CN102003169B (en) | 2010-09-17 | 2010-09-17 | Method for repairing accident well of coal bed methane multi-branch horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010286276 CN102003169B (en) | 2010-09-17 | 2010-09-17 | Method for repairing accident well of coal bed methane multi-branch horizontal well |
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| CN102003169A true CN102003169A (en) | 2011-04-06 |
| CN102003169B CN102003169B (en) | 2013-01-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775324A (en) * | 2021-08-04 | 2021-12-10 | 伍丕济 | Combustible ice mining method |
| CN114482956A (en) * | 2021-12-20 | 2022-05-13 | 中煤地质集团有限公司 | Coal bed gas yield increasing method |
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| WO1994003702A1 (en) * | 1992-08-07 | 1994-02-17 | Baker Hughes Incorporated | Method and apparatus for sealing the juncture between a vertical and horizontal well |
| CN200982157Y (en) * | 2006-12-14 | 2007-11-28 | 中国石油天然气股份有限公司 | Fast production recovery process device for small-bore deep well junk incapable of being processed |
| CN200985757Y (en) * | 2006-07-20 | 2007-12-05 | 范伟光 | Milling shoe |
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2010
- 2010-09-17 CN CN 201010286276 patent/CN102003169B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994003702A1 (en) * | 1992-08-07 | 1994-02-17 | Baker Hughes Incorporated | Method and apparatus for sealing the juncture between a vertical and horizontal well |
| CN200985757Y (en) * | 2006-07-20 | 2007-12-05 | 范伟光 | Milling shoe |
| CN200982157Y (en) * | 2006-12-14 | 2007-11-28 | 中国石油天然气股份有限公司 | Fast production recovery process device for small-bore deep well junk incapable of being processed |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775324A (en) * | 2021-08-04 | 2021-12-10 | 伍丕济 | Combustible ice mining method |
| CN114482956A (en) * | 2021-12-20 | 2022-05-13 | 中煤地质集团有限公司 | Coal bed gas yield increasing method |
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| Publication number | Publication date |
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| CN102003169B (en) | 2013-01-09 |
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