CN101979826B - Method for repairing coal bed gas multi-branch horizontal accident well - Google Patents
Method for repairing coal bed gas multi-branch horizontal accident well Download PDFInfo
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- CN101979826B CN101979826B CN 201010286250 CN201010286250A CN101979826B CN 101979826 B CN101979826 B CN 101979826B CN 201010286250 CN201010286250 CN 201010286250 CN 201010286250 A CN201010286250 A CN 201010286250A CN 101979826 B CN101979826 B CN 101979826B
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Abstract
The embodiment of the invention discloses a method for repairing a coal bed gas multi-branch horizontal accident well, which comprises the following steps of: determining a new target at the position above 1 meter above a communicating point between a horizontal well and a drainage-mining straight well hole; filling sand into the drainage-mining straight well hole or performing plugging between a deflection point of the horizontal well and the drainage-mining straight well hole by using a packer; determining a side drilling point above the deflection point in the horizontal well; plugging an original horizontal well bore below the side drilling point; and drilling a horizontal section of a new horizontal well by using the side drilling point as a starting point, wherein the horizontal section of the new horizontal well is over 1 meter higher than the horizontal section of the original horizontal well, the horizontal projection of the track of the horizontal section of the new horizontal well is arch-shaped and deviates from the right upper part of the horizontal section of the original horizontal well, and the new horizontal well passes through the new target. By drilling the new horizontal well above the original horizontal well in the embodiment, the new horizontal well and the original horizontal well are not on the same horizontal plane, so the wellbore of the new horizontal well is not affected. Therefore, wellbore rejection and coal bed gas resource waste caused by horizontal well bore accidents are 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-branch horizontal accident well.
Background technology
In the process of wellbore construction, down-hole accident can might occur in coal bed gas multilateral well, single horizontal well or U-shaped 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, fish refer to because of a variety of causes cause stay in well such as drilling rod, drill collar, drill bit or salvage all kinds of instruments etc. of use.Because the fish in well will completely or partially be stopped up well, thereby, the further construction of coal bed gas well and follow-up gas production effect can be affected.
At present, for the solution that leaves the fish well after accident be, judge that first fish adopts the distance of straight well cave apart from row, when distance long enough (generally referring to more than at least 50 meters), when not affecting sidetracking, can carry out sidetracking in the anterior position of fish, thereby the accident point of walking around the fish place is completed follow-up coal seam drilling depth.Can continue to utilize the utilization that completed horizontal well coal seam horizontal segment also can part thereby make in the accident well completed row adopt straight well.
But at present, when fish is adopted straight well cave very near (generally referring at least 50 meters) apart from row, in the time of can't carrying out sidetracking, generally, this accident well will engineering be scrapped, thereby causes great loss.And the row after engineering is scrapped adopts straight well and horizontal well probably all can't recycle, so also need to arrange the construction again of adopting straight well and horizontal well, so also can extend whole construction period.
In sum, to adopt straight well cave apart from row very near when fish, in the time of can't carrying out sidetracking, can't realize the continuation utilization of accident well in prior art, thereby cause serious economic loss.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of means to save the situation of coal bed gas multi-branch horizontal accident well, to realize that to adopt straight well cave apart from row very near and can't carry out sidetracking the time, continue to utilize the purpose of accident well when fish.
The embodiment of the present invention is achieved in that
A kind of means to save the situation of coal bed gas multi-branch horizontal comprises step:
Adopt the location positioning novel targets more than 1 meter on the connectivity points of straight well cave at horizontal well with row;
Row is adopted straight well cave fill up sand, or, adopt the kickoff point (KOP) of horizontal well and row and use packer to implement packing between straight well cave;
Determine side tracking point above the former kickoff point (KOP) of horizontal well straight well section;
Be locked in the following horizontal well well of described side tracking point;
Be drilled with the new height well take described side tracking point as starting point; 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 former horizontal well horizontal segment that described new height well trajectory of horizontal horizontal projection is; Described new height well passes novel targets.
Preferably, in embodiments of the present invention, described sand is filled up in former cave after, also comprise step: sand is hit tight.
Preferably, in embodiments of the present invention, in described process of former cave being filled up sand, use drilling tool will hit tight sand.
Preferably, in embodiments of the present invention, described sand is clean river sand or fracturing sand uniformly.
Preferably, in embodiments of the present invention, the described following former horizontal well well of side tracking point that is locked in is to adopt cement admittedly to seal.
Preferably, in embodiments of the present invention, described more than 1 meter the position be specially: 1 to 4 meter.
Preferably, in embodiments of the present invention, described more than 1 meter the position be specially more than 2.5 meters.
Preferably, in embodiments of the present invention, described decide the new height well and pass novel targets after, the angle in the orientation of the trajectory of horizontal of new height well horizontal segment and former horizontal well is greater than 8 degree.
Preferably, in embodiments of the present invention, described angle is the 10--20 degree.
Can find out from above-mentioned technical scheme, the embodiment of the present invention is by again being drilled with horizontal well above the previous level well, make new height well and previous level well not on same level, thus very near even the positional distance of fish row adopts straight well cave, also can not affect the well of new height well.Thereby got around fish in former horizontal well, avoided fish to stop up the impact that well causes.
In addition, in the embodiment of the present invention, also 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 complete after, if former horizontal well caves in, can affect the situation of construction or the use of new height well.
The embodiment of the present invention has been avoided the impact that distance row adopts the very near fish of straight well cave effectively in the situation that utilize original row to adopt straight well and horizontal well, has avoided row to adopt scrapping of straight well and horizontal well.
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 the flow chart of the means to save the situation of the well of coal bed gas multi-branch horizontal accident described in the embodiment of the present invention.
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, some down-hole accident and to stay fish be that after deflecting occurs, setting of casing does not seal admittedly, directly is communicated with under the situation of operation and the drilling well of subsequent horizontal section.At this moment, if it is very near that the positional distance of fish row adopts straight well cave, can't carry out sidetracking and walk around fish, in order to continue in this case to utilize the accident well, avoid loss, the embodiment of the present invention provides a kind of means to save the situation of coal bed gas multi-branch horizontal accident well, as shown in Figure 1, comprises step:
S11, adopt the location positioning novel targets more than 1 meter on the connectivity points of straight well cave at the distance horizontal well with row;
The embodiment of the present invention is drilled with inclination section and the Connectivity Section of horizontal well again by utilizing the Vertical Well section of original horizontal well in described Vertical Well section, and walks around the fish position and realize continuation utilization to original accident well.Because the horizontal well well by original cave leaves fish, if the new height well is in same level with former horizontal well again, can can't construct because of stopping of fish, so in the embodiment of the present invention, adopting the location positioning novel targets of connectivity points more than 1 meter in the former cave of straight well apart from row; The well that the novel targets here refers to be drilled with new horizontal well is adopted row needs the position passed through in straight well.Adopt the cave of straight well for fear of original row on the impact of new height well well, in embodiments of the present invention, also set the safe distance in novel targets and original cave, at least to guarantee more than 1 meter, collapse thereby avoid causing because the coal seam support force between new height well and original cave is too small, and then the impact construction.
S12, row is adopted straight well cave fill up sand, or, adopt the kickoff point (KOP) of horizontal well and row and use packer to implement packing between straight well cave;
In the embodiment of the present invention, the well of horizontal well does not have setting of casing admittedly to seal, if can adopt cement admittedly to seal as 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 solid envelope, the height of the solid water shutoff mud of impact 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.
Follow-up to drag for husky operation more smooth in order to make, and avoids inhomogeneous the causing of sandstone particle to drag for husky difficulty.Preferably, in embodiments of the present invention, the sand that adopts can be clean river sand or fracturing sand.
In order to play the effect of better obstruct cement, in addition, be also in order to form certain support force to former cave, thereby avoid former cave to cave in; 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.
S13, determine side tracking point above the former kickoff point (KOP) of horizontal well straight well section;
In the embodiment of the present invention, need to again be drilled with well in the straight well section of previous level well, because the position of new horizontal well horizontal segment need to be above the horizontal segment of former horizontal well, so, the straight well section that new side tracking point also need to be in horizontal well.Further, this side tracking point is above former kickoff point (KOP).
S14, the following former horizontal well well of sealing side tracking point;
For the support strength that increases sidetracking and with former horizontal hole isolation, need to carry out solid envelope to former horizontal well well, in embodiments of the present invention, can use cement that former horizontal well well is filled up with the former horizontal well well of solid envelope.
In step S12, just in advance sand has been filled up in former cave, or, carried out packing, thus the cement flows that ought admittedly seal former horizontal well well can be blocked before adopting straight well cave to arranging, thereby can well guarantee the height of cement.
S15, be drilled with new height well well take described side tracking point as starting point; 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 former horizontal well horizontal segment that the horizontal projection of described new height well trajectory of horizontal is; Described new height well passes novel targets.
By again be drilled with horizontal well above the previous level well, make the horizontal segment of new height well and previous level well horizontal segment not on same level, so that even the positional distance of fish row adopts straight well cave is very near, also can not affect the horizontal section wellbore of new height well.Thereby got around fish in former horizontal well horizontal segment, avoided fish to stop up the impact that well causes.
In embodiments of the present invention, in the work progress of new height well or be drilled with complete after, cave in as former horizontal well, in the time of close to the new height well spacing is crossed from former horizontal well, can affect 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 to maintain a certain distance to avoid impact with former horizontal well; In embodiments of the present invention, safe distance can be set as, at least will be more than 1 meter near the cave, other well section keeps the space length of 2.5 meters at least.
Because the angle of the vertical discrepancy in elevation between two wells and deviation has determined space length both, distance is larger, and the interference between two wells is just less.in order better to avoid the impact of former horizontal well, the height of new height well horizontal segment is not only high than former horizontal well horizontal segment, but also to avoid directly over the horizontal segment of former horizontal well, concrete method can be, the track horizontal projection of new horizontal well well is arc, namely beginning from side tracking point and the previous level well section direction that staggers, namely, with the direction of the accident well section that leaves fish, an angle is arranged so that new height well horizontal section wellbore as far as possible not directly over the horizontal segment of former horizontal well, then the horizontal section wellbore of new height well is again with an arc trajectory wraparound and pass novel targets.Can effectively avoid like this horizontal segment of former horizontal well to collapse on the impact of new height well well, also reduce fish for the magnetic interference of measurement while-drilling instrument in new well drilling tool.
Concrete, in embodiments of the present invention, solid sealed the former horizontal well deflecting below the side tracking point and be communicated with well after, begin drilling well from the side tracking point that sets, the track of new well of boring is at initial segment, certain angle need to be arranged with the orientation of former horizontal well trajectory of horizontal, so that new side-tracked hole leaves former accident well as early as possible.Because the new height well need to pass novel targets, so the new height well has the direction of certain angle to advance after a segment distance at the vertical plane along former horizontal well trajectory of horizontal, also to adjust direction, advance to the novel targets position.Like this, the track horizontal projection of new height well horizontal segment becomes arc.Because the horizontal segment horizontal projection of new horizontal well is arc, after so it adopts the novel targets of straight well through row, also must have certain angle with the direction of the trajectory of horizontal of former horizontal well, like this, although pass new height well well after novel targets above former horizontal well well, but be not in directly over the well of former horizontal well, caving on the impact of new height well well of former horizontal well well below so just having avoided also reduced the magnetic interference of fish for measurement while-drilling instrument in new well drilling tool.
In embodiments of the present invention, by again being drilled with horizontal well in original above position of leaving the horizontal well of fish, and the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby effectively avoided in the situation that utilize original row to adopt straight well and horizontal well the impact that distance row adopts the very near fish of straight well cave, avoided row to adopt scrapping of straight well and horizontal well.
Preferably, in the above-described embodiments, new height well horizontal segment can be higher than 1 to 4 meter of former horizontal well horizontal segment.
The impact when distance of 1 to 4 meter can well guarantee not only that the new height well is not caved in by former level, and having avoided when thinner in the coal seam of exploitation, can because of with the excessive exploitation position of staggering better of former horizontal well distance, and output is exploited in impact.Preferably, in embodiments of the present invention, described new height well horizontal segment can be higher than former horizontal well horizontal segment more than 2.5 meters.
Preferably, in above-mentioned all embodiment, after described new height well passed novel targets, the angle in the orientation of the trajectory of horizontal of new height well and former horizontal well was greater than 8 degree.
In embodiments of the present invention, be 8 to spend by the angle of setting minimum new height well and the vertical plane of the trajectory of horizontal of former horizontal well, after having guaranteed that the new height well passes novel targets, the impact of former horizontal well is avoided in the safety of new height well.Preferably, described angle can be the 10-20 degree.
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 (8)
1. the means to save the situation of a coal bed gas multi-branch horizontal, is characterized in that, comprises step:
Adopt the location positioning novel targets more than 1 meter on the connectivity points of straight well cave at the distance horizontal well with row;
Row is adopted straight well cave fill up sand, or, adopt the kickoff point (KOP) of horizontal well and row and use packer to implement packing between straight well cave;
Determine side tracking point above the former kickoff point (KOP) of horizontal well straight well section;
The former horizontal well well that the described side tracking point of sealing is following;
Be drilled with the new height well take described side tracking point as starting 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 former horizontal well horizontal segment that the horizontal projection of described new height well trajectory of horizontal is; Described new height well passes described novel targets;
After described new height well passed novel targets, the angle in the orientation of the trajectory of horizontal of new height well horizontal segment and former horizontal well was greater than 8 degree.
2. method according to claim 1, is characterized in that, described sand is filled up in former cave after, also comprise step: sand is hit tight.
3. method according to claim 2, is characterized in that, in described process of former cave being filled up sand, uses drilling tool will hit tight sand.
4. method according to claim 3, is characterized in that, described sand is clean river sand or fracturing sand uniformly.
5. method according to claim 3, is characterized in that, the described following former horizontal well well of side tracking point that is locked in is to adopt cement admittedly to seal.
6. method according to claim 1, is characterized in that, described more than 1 meter the position be specially: 1 to 4 meter.
7. method according to claim 6, is characterized in that, described more than 1 meter the position be specially more than 2.5 meters.
8. method according to claim 1, is characterized in that, described angle is 10 to 20 degree.
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| CN103603643A (en) * | 2013-11-26 | 2014-02-26 | 中国石油集团长城钻探工程有限公司 | Coal bed gas U-shaped well staged fracturing exploitation technology |
| CN109899053B (en) * | 2017-12-08 | 2022-02-01 | 中国石油天然气股份有限公司 | Method and device for determining drilling well site and computer readable storage medium |
| CN112796730B (en) * | 2021-02-08 | 2022-04-12 | 太原理工大学 | Method for laying ground drilling well pattern in multi-horizontal cross-production area |
| CN113775324A (en) * | 2021-08-04 | 2021-12-10 | 伍丕济 | Combustible ice mining method |
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| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101173604A (en) * | 2007-11-16 | 2008-05-07 | 中国科学院武汉岩土力学研究所 | Method for horizontal well mixed gas displacing coal-bed gas |
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| US7264049B2 (en) * | 2004-05-14 | 2007-09-04 | Maguire James Q | In-situ method of coal gasification |
| US7618547B2 (en) * | 2007-02-23 | 2009-11-17 | Waste Management, Inc. | Groundwater treatment system with air injection into vadose zone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101173604A (en) * | 2007-11-16 | 2008-05-07 | 中国科学院武汉岩土力学研究所 | Method for horizontal well mixed gas displacing coal-bed gas |
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