CN102080530B - Method for constructing horizontal coal bed gas well and vertical drainage and mining well - Google Patents
Method for constructing horizontal coal bed gas well and vertical drainage and mining well Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for constructing a horizontal coal bed gas well and a vertical drainage and mining well, which comprises the following steps: drilling a vertical drainage and mining well communicated with a horizontal well; when the horizontal well is drilled, drilling a horizontal section of the horizontal well on a stratum which is a set distance away from the plane of a target layer; cleaning the horizontal well and putting in a casing pipe; and carrying out directed duct communication toward the direction of the target layer on the horizontal section. The embodiment adopts the technical scheme that the horizontal section of the horizontal well is drilled on the stratum which is the set distance away from the plane of the target layer when the horizontal well is drilled, and directed duct communication is carried out toward the direction of the target layer on the drilled horizontal section; and thus, when the coal bed gas of the target layer is collected, the horizontal section of the horizontal well does not need to be drilled on the target layer, thereby solving the problem that the normal drainage and mining of the coal bed gas is possibly affected by wellhole blocking as a result of wellhole collapse accidents because the horizontal section wellhole of the horizontal well needs to be drilled on the target layer in the prior art and the geologic structure of the target layer is too loose.
Description
Technical field
The present invention relates to the coal-bed gas exploitation field, more particularly, relate to a kind of coal bed gas horizontal well and row and adopt the straight well job practices.
Background technology
In the coal-bed gas exploitation field, with what need in the stratum to exploit, the coal seam of output coal bed gas is referred to as destination layer.
At present, when adopting the horizontal wells coal bed gas, the general mode that adopts is, at first the row of being drilled with adopts straight well and passes destination layer, and then be drilled with horizontal well, the horizontal segment of horizontal well is drilled with in destination layer, is communicated with by horizontal well is adopted straight well with row, thereby make the coal bed gas of oozing out in destination layer adopt outside row adopts the well of straight well along hoistway row.
But, if adopt aforesaid way, when the geologic structure of destination layer is too loose, as, destination layer is the high coalbed gas geology structure of cherry coal, owing to being drilled with the hoistway of horizontal well at destination layer like this, so can't implement at such destination layer the exploitation of coal bed gas; And, even be drilled with the horizontal segment of horizontal well at the too loose destination layer of geologic structure, owing to being easy to that the hoistway cave-in accident occurs, thereby hoistway is stopped up, and then the normal row who affects coal bed gas adopt.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of horizontal well and row to adopt the straight well job practices, to realize in the situation that the purpose that the loose normal row of destination layer geologic structure adopts.
The embodiment of the present invention is achieved in that
A kind of coal bed gas horizontal well and row adopt the straight well job practices, comprise step:
Be drilled with for the row who is communicated with horizontal well and adopt straight well and reaming;
When being drilled with horizontal well, the horizontal segment that is drilled with horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance is communicated with straight well;
Horizontal well is cleaned and is lowered to sleeve pipe;
Implementing directed duct at described horizontal segment to described destination layer direction of living in links up.
Preferably, in embodiments of the present invention, described setpoint distance is 2 to 3 meters.
Preferably, described when being drilled with horizontal well in embodiments of the present invention, be drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, be specially:
Be drilled with the horizontal segment of horizontal well at the geological stratification of the following setpoint distance in distance objective layer plane of living in.
Preferably, described when being drilled with horizontal well in embodiments of the present invention, be drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, be specially:
Be drilled with the horizontal segment of horizontal well at the geological stratification of the above setpoint distance in distance objective layer plane of living in.
Preferably, in embodiments of the present invention, the horizontal segment that described geological stratification at distance objective layer plane of living in setpoint distance is drilled with horizontal well is: the horizontal segment that is drilled with horizontal well at the geological stratification of the above setpoint distance in plane of living in, destination layer coal seam.
Preferably, in embodiments of the present invention, the concrete mode of described directed communication is: directed jetting.
Preferably, in embodiments of the present invention, described horizontal segment adopts barefoot completion.
Preferably, in embodiments of the present invention, the concrete mode of described directed communication is: the horizontal segment sidetracking enters described destination layer, forms multi-branched horizontal well.can find out from above-mentioned technical scheme, in embodiments of the present invention, work as when being drilled with horizontal well by employing, be drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, and implement to the direction of destination layer the technical scheme that directed duct is linked up at the horizontal segment that is drilled with, make when gathering the coal bed gas of destination layer, needn't be drilled with at destination layer the horizontal segment of horizontal well, thereby make when destination layer is the high coalbed gas geology structure of cherry coal, in recovery process to coal bed gas in destination layer, avoided to be drilled with the horizontal segment hoistway of horizontal well at such destination layer in the prior art, thereby can the hoistway cave-in accident easily occur because the geologic structure of destination layer is too loose and hoistway is stopped up, and then the normal row who the affects coal bed gas problem of adopting.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that horizontal well described in the embodiment of the present invention and row adopt the flow chart of straight well job practices;
Fig. 2 is the horizontal segment position view that horizontal well described in the embodiment of the present invention and row adopt horizontal well in the straight well job practices;
Fig. 3 is the horizontal segment position view that horizontal well described in the embodiment of the present invention and row adopt another horizontal well in the straight well job practices.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In the practice of construction process, when too loose, also can carry out to destination layer the purpose of normal coal bed gas extraction for the geologic structure of realize target layer, the embodiment of the present invention provides a kind of horizontal well and row to adopt the straight well job practices, it is characterized in that, as shown in Figure 1, comprise step:
S11, be drilled with for the row who is communicated with horizontal well and adopt straight well and carry out reaming;
Not at destination layer, so in embodiments of the present invention, when adopting straight well in the row of being drilled with, the cave that row adopts straight well is not also at destination layer, but position residing according to the horizontal segment of horizontal well, be positioned at top or the below of destination layer due to the horizontal segment of horizontal well.
The security needs of straight well cave well section in order to mine of prior art, the glass reinforced plastic sleeve that all is lowered to cuts and coal seam section reaming glass reinforced plastic sleeve when doing the cave.In the present embodiment, the cave well section of the straight well that is communicated with horizontal segment can be lowered to glass reinforced plastic sleeve, carries out reaming according to prior art, also can be lowered to steel sleeve, forges to mill according to prior art to form the cave.
S12, when being drilled with horizontal well, be drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance;
In the embodiment of the present invention, for the geologic structure of destination layer too loose, for this reason, when being drilled with horizontal well, the horizontal segment of horizontal well is avoided destination layer, like this, due to horizontal segment not at destination layer, so its geologic structure is relatively stable, can not cave in, thereby can not cause the obstruction of hoistway.
Concrete, in embodiments of the present invention, can be drilled with at the geological stratification of the following setpoint distance in distance objective layer plane of living in the horizontal segment of horizontal well; In addition, also can be drilled with at the geological stratification of the above setpoint distance in distance objective layer plane of living in the horizontal segment of horizontal well.
As shown in Figure 2, when the geological stratification at the following setpoint distance in distance objective layer 14 plane of living in is drilled with the horizontal segment 12 of horizontal well 11, when being drilled with horizontal well, can design according to borehole track, after well section deflecting above in the of 14 and pass destination layer, the horizontal segment 12 that then is drilled with horizontal well 11 below destination layer plane of living in is adopted straight well with row and is communicated with.
As shown in Figure 3, when the geological stratification at the above setpoint distance in distance objective layer 4 plane of living in is drilled with the horizontal segment 2 of horizontal well 1, when being drilled with horizontal well 1, after can destination layer 4 top deflectings, the horizontal segment 2 that is drilled with horizontal well 1 at the geological stratification of the above setpoint distance on destination layer 4 planes of living in be adopted straight well with row and is communicated with.
When can be convenient to be communicated with destination layer pore-creating, the geologic structure that can also guarantee the horizontal segment of horizontal well is stablized, for the directed jetting of follow-up enforcement provides implementation condition, in the invention process example, described setpoint distance can be 2 to 3 meters, that is to say, the vertical distance of horizontal segment hoistway distance objective layer is 2 to 3 meters.
In embodiments of the present invention, the target coal seam in applied environment is soft, and pore-creating character is very poor, horizontal segment is arranged on destination layer and destination layer under dual mode in, the mode of preferred levels section on destination layer, this be because:
The first, from the wellbore construction angle, horizontal segment will pass through this coal seam section at the inclination section of lower mode, and the risk of wellbore construction and follow-up completion practice such as setting of casing or cementing operation is larger.The second, from the angle of follow-up directional sidetracking, the technology difficulty of sidetracking is more much smaller than the difficulty of the sidetracking that makes progress downwards; The 3rd, adopt the angle of operation from follow-up row, row adopts in process, local coal seam section collapses when stopping up the duct, horizontal segment is in upper situation, the section of collapsing only affects the smoothness of the well section oneself that collapses, horizontal segment under situation, the later well Duan Jun of the section of collapsing is stopped up.
S13, horizontal well is cleaned and is lowered to sleeve pipe.
After horizontal segment and row adopt straight well and are communicated with, horizontal well is cleaned, so that the hoistway of horizontal well horizontal segment is unimpeded, then is lowered to sleeve pipe the borehole wall is carried out supporting, guarantee that this well can be reentried and ickings cleans.
S14, implement directed duct at described horizontal segment to described destination layer direction of living in and link up;
Due in the invention process, the horizontal segment of horizontal well is not at destination layer, so the coal bed gas after being drilled with horizontal segment in destination layer is in the horizontal segment hoistway that can't ooze out in horizontal well, adopts thereby can't arrange coal bed gas; For this reason, after being drilled with of the horizontal segment hoistway of completing horizontal well, the invention process also need to be implemented directed duct to described destination layer direction of living at horizontal segment and link up, destination layer is communicated with the horizontal segment hoistway of horizontal well, thereby the coal bed gas that makes destination layer can be oozed out and discharge along horizontal segment, adopts to well thereby can adopt straight well row by row.
Concrete, in embodiments of the present invention, described directed duct is linked up and is specifically as follows: directed jetting mode.
Adopt directed jetting technique, its technique and existing jetting technology type are seemingly; But prior art is not high for the required precision of injection direction, as long as satisfy at the destination layer horizontal-jet just passable.The injection here requires the jetting direction along the direction towards target coal seam of setting, and before each the injection, need to carry out tool-face to shower nozzle and locate.Therefore this programme on original technical foundation, was connected with aspect sensor and emission assembly before the taking device of original oil pipe pipe string, and is after calculating by angular difference, that the whipstock direction is super lower or up, thereby makes the waterpower shower nozzle injection direction coal seam that aims at the mark.
Directed duct in the embodiment of the present invention is linked up, and after can also adopting the horizontal segment barefoot completion, enters the mode in coal seam to the destination layer sidetracking at described horizontal segment, and returns at assurance downhole safety prerequisite backspin and stretch 50-100m, forms several sidetracking branch well holes.
in sum, in embodiments of the present invention, work as when being drilled with horizontal well by employing, be drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, and implement to the direction of destination layer the technical scheme that directed duct is linked up at the horizontal segment that is drilled with, make when gathering the coal bed gas of destination layer, needn't be drilled with at destination layer the horizontal segment of horizontal well, thereby make when destination layer is the high coalbed gas geology structure of cherry coal, in recovery process to coal bed gas in destination layer, avoided to be drilled with the horizontal segment hoistway of horizontal well at such destination layer in the prior art, thereby can the hoistway cave-in accident easily occur because the geologic structure of destination layer is too loose and hoistway is stopped up, and then the normal row who the affects coal bed gas problem of adopting.
In addition, what need prompting is, the art personnel should also know, described coal bed gas horizontal well in the embodiment of the present invention and row adopt straight well job practices method, can also utilize before the coal mining coal seam to the gas production in the coal seam in, reducing the gas bearing capacity in the coal seam, thereby play the effect of coal mine gas protrusion-dispelling.
In this manual, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
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 apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a coal bed gas horizontal well and row adopt the straight well job practices, it is characterized in that, comprise step:
Be drilled with for the row who is communicated with horizontal well and adopt straight well and reaming;
When being drilled with horizontal well, the horizontal segment that is drilled with horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance is communicated with straight well;
Horizontal well is cleaned and is lowered to sleeve pipe;
Implementing directed duct at described horizontal segment to described destination layer direction of living in links up.
2. method according to claim 1, is characterized in that, described setpoint distance is 2 to 3 meters.
3. method according to claim 1, is characterized in that, and is described when being drilled with horizontal well, is drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, is specially:
Be drilled with the horizontal segment of horizontal well at the geological stratification of the following setpoint distance in distance objective layer plane of living in.
4. method according to claim 1, is characterized in that, and is described when being drilled with horizontal well, is drilled with the horizontal segment of horizontal well at the geological stratification of distance objective layer plane of living in setpoint distance, is specially:
Be drilled with the horizontal segment of horizontal well at the geological stratification of the above setpoint distance in distance objective layer plane of living in.
5. according to claim 3 or 4 described methods, is characterized in that, described directed duct is linked up concrete mode and is: directed jetting.
6. method according to claim 1, is characterized in that, described horizontal segment adopts barefoot completion.
7. method according to claim 6, is characterized in that, described directed duct is linked up concrete mode and is: the horizontal segment sidetracking enters described destination layer, forms multi-branched horizontal well.
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| CN102493790A (en) * | 2011-12-27 | 2012-06-13 | 北京奥瑞安能源技术开发有限公司 | Method for increasing yield of coal bed gas |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
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| CN104453792A (en) * | 2014-07-04 | 2015-03-25 | 贵州省煤层气页岩气工程技术研究中心 | Coal seam mining method and structure |
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| CN110656941B (en) * | 2019-10-31 | 2021-12-21 | 中煤科工集团重庆研究院有限公司 | Design method and construction process of man-shaped ground well in coal mining area |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
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