CN101975055B - Method for remediating trouble well of coal bed gas multi-branch horizontal well - Google Patents
Method for remediating trouble well of coal bed gas multi-branch horizontal well Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for remediating a trouble well of a coal bed gas multi-branch horizontal well, which comprises the steps of: determining a new target spot on a position over 1m away from a communicating point of the horizontal well and a production straight well cave; putting a packer for packing in the lower end of a straight well section or an angle building section of the horizontal well; cutting a second section sleeve on the free section of the second section sleeve in the straight well section, lifting the second section sleeve above a cutting point out of the well; setting a side tracking point at a position above 20m away from the cutting point in the straight well section of the horizontal well; and sealing the wellbore of the original horizontal well below the side tracking point. In the embodiment of the invention, the horizontal section of the horizontal well is drilled again above the horizontal section of the original horizontal well to ensure that the horizontal section of a new horizontal well and the horizontal section of the original horizontal section are not on the same plane, thus even if the caught-on position is nearer to the production straight well cave, the wellhole of the new horizontal well is not influenced. Therefore, the caught on in the original horizontal well is avoided, and the influence caused by the blockage in the wellhole by the caught is prevented.
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, 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 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 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 the accident be, judge that first fish adopts the distance of straight well cave apart from row, when distance long enough (referring to more than at least 50 meters generally speaking), 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 finished follow-up coal seam drilling depth.Thereby so that completed row adopts straight well and can continue to utilize in the accident well, the utilization that completed horizontal well coal seam horizontal segment also can part.
But at present, when fish is adopted straight well cave very near (referring at least 50 meters generally speaking) apart from row, in the time of can't carrying 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 probably all can't recycle, so also need to arrange the again construction of adopting straight well and horizontal well, so also can prolong 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, and continuation utilization that can't realization accident well in the prior art, thus caused serious economic 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-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, can continue to utilize the purpose of accident well when fish.
The embodiment of the invention is achieved in that
A kind of means to save the situation of coal bed gas multi-branch horizontal accident well 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;
At straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
Two opening sleeve pipe free segment cutting two and drive sleeve pipe in the straight well section, and two of part more than the cut point is driven sleeve pipe propose outside the well; In horizontal well straight well section, apart from the position of described cut point more than 20 meters side tracking point is set; The former horizontal well well that sealing side tracking point position is following;
Be drilled with new height well horizontal segment take described side tracking point as starting point; Described new height well horizontal segment passes described novel targets, and 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 described new height well trajectory of horizontal horizontal projection is.
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 former horizontal well horizontal segment 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 of the vertical plane of the trajectory of horizontal of new height hoistway and former horizontal well is greater than 8 degree.
Preferably, in embodiments of the present invention, described angle is 10 to 20 degree.
The embodiment of the invention also provides the means to save the situation of another kind of coal bed gas multi-branch horizontal accident well, 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;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
In horizontal well, above the packer and be the position of straight well section, set side tracking point;
Be drilled with new height well horizontal segment take described side tracking point as starting point in the mode of windowing; 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 described new height well trajectory of horizontal horizontal projection is; Described new height well passes described novel targets.
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 former horizontal well horizontal segment 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 of the vertical plane 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 10 to 20 degree.
Can find out from above-mentioned technical scheme, the embodiment of the invention is by again being drilled with the horizontal segment of horizontal well above the previous level well, make new height well horizontal segment 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 well of new height well.Thereby got around fish in the former horizontal well, avoided fish to stop up the impact that well causes.
In addition, in the embodiment of the 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.
In the situation that the embodiment of the invention has effectively been avoided the impact that distance row adopts the very near fish of straight well cave, has been avoided row to adopt scrapping of straight well and horizontal well utilizing original row to adopt 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, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is 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 invention;
Fig. 2 is the flow chart of the means to save the situation of the well of coal bed gas multi-branch horizontal accident described in further embodiment of this invention.
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 obtains under the creative work prerequisite.
In the practice of construction process, some down-hole accident and to stay fish be to occur in when deflecting to finish, and lower good sleeve pipe, and after sleeve pipe finished well cementing of cement.At this moment, if the positional distance diameter cave of fish is very near, can't carries out sidetracking and walk 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-branch horizontal accident well, as shown in Figure 1, comprise 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 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.Because the horizontal well hoistway 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 invention, the location positioning novel targets on the connectivity points of adopting the former cave of straight well apart from row more than 1 meter; The well that the novel targets here refers to be drilled with new horizontal well is adopted row needs the position passed through in the straight well.For fear of the impact of original cave on new height well hoistway, 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 the original cave is too small, and then impact is constructed.
S12, at straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
In the embodiment of the invention, because the horizontal well inclination section has been finished setting of casing, so can use packer in sleeve pipe, to set, make the straight well Duan Yuyuan horizontal well horizontal segment of horizontal well and row adopt straight well realization isolation.By with straight well Duan Yuyuan horizontal segment isolation, thereby can when the original horizontal well straight well section of recycling, not be subjected to the impact of previous level well inclination section.
S13, two opening sleeve pipe free segment cutting two and drive sleeve pipe in the straight well section, and two of part more than the cut point is driven sleeve pipe propose outside the well; In horizontal well straight well section, apart from the position of described cut point more than 20 meters side tracking point is set; The well section that sealing side tracking point position is following;
Because in the embodiment of the invention, need to again be drilled with horizontal section wellbore in the straight well section of previous level well, so, need to open outside the part cutting and proposition well of free segment in the sleeve pipe, in order to expose the open hole borehole wall that can be drilled with new height section deflecting the boring section two;
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, in order to make things convenient for the construction of sidetracking, can also adopt the cement sealing horizontal hole, the position of sealing arrives described side tracking point position and gets final product.
S14, 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 the 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.
By above the previous level well, again being drilled with horizontal 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 the 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 such 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 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 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 the new well drilling tool.
Concrete, in embodiments of the present invention, solid sealed the former horizontal well well below the side tracking point 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 horizontal section wellbore as early as possible.Because new height well horizontal segment need to pass novel targets, so new height well horizontal segment has the direction of certain angle to advance behind the 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 then 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 behind the 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 the new well drilling tool.
In embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the trajectory of horizontal of new height hoistway and former horizontal well is controlled to be greater than 8 degree.Preferably, described angle can also be controlled to be 10 to 20 degree.
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 the impact that distance row adopts the very near fish of straight well cave in the situation that utilize original row to adopt straight well and horizontal well, avoided row to adopt scrapping of straight well and horizontal well.
In another embodiment of the present invention, also provide the means to save the situation of another kind of coal bed gas multi-branch horizontal accident well, as shown in Figure 2, comprised step:
S21, 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;
S22, at straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
In the embodiment of the invention, step S11 and step S12 among step S21 and step S22 and the embodiment illustrated in fig. 1 are similar, do not repeat them here.
S23, in horizontal well, above the packer and be the position of straight well section, set side tracking point;
The embodiment of the invention for be the more stable situation of geologic structure, owing to being drilled with well at the stable geological stratification of geologic structure and being not easy to cave in, in horizontal well straight well section, two open the mode that the sleeve pipe uplifting window is drilled with new inclination section and horizontal section wellbore so can directly adopt.
Because the horizontal section wellbore that newly is drilled with need to be on former net horizontal section well, so side tracking point also will be chosen at the top of kickoff point (KOP).
S24, be drilled with the new height well take described side tracking point as starting point in the mode of windowing; 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 trajectory of horizontal is; Described new height well passes described novel targets.
In embodiments of the present invention, except being drilled with the technique difference of new inclination section and horizontal segment, embodiment shown in its principle and Fig. 1 is basic identical, also by above the previous level well, again being drilled with horizontal well, thereby 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 the former horizontal well horizontal segment, avoided fish to stop up the impact that well causes.
In addition, also have with the embodiment shown in Fig. 1 is essentially identical, in the work progress of new height well or be drilled with complete after, cave in such 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 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 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 horizontal projection of new horizontal well track 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 horizontal section wellbore, also reduce fish for the magnetic interference of measurement while-drilling instrument in the new well drilling tool.
Concrete, in embodiments of the present invention, solid sealed the former horizontal well well below the side tracking point 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, with the horizontal segment of avoiding the new height well directly over former horizontal well horizontal segment.Because the new height well need to pass novel targets, so the new height well has the direction of certain angle to advance behind the 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 then 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 behind the novel targets above former horizontal well well, but be not in directly over the well of former horizontal well, so just avoided the caving on the impact of new height well well of former horizontal well well of below.
In embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the trajectory of horizontal of new height hoistway and former horizontal well is controlled to be greater than 8 degree.Preferably, described angle can also be controlled to be 10 to 20 degree.
Each embodiment adopts the mode of going forward one by one to describe in this manual, and what each embodiment stressed 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 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, in other embodiments realization.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 (10)
1. the means to save the situation of a coal bed gas multi-branch horizontal accident well 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;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
Two opening sleeve pipe free segment cutting two and drive sleeve pipe in the straight well section, and two of part more than the cut point is driven sleeve pipe propose outside the well; In horizontal well straight well section, apart from the position of described cut point more than 20 meters side tracking point is set; The former horizontal well well that sealing side tracking point position is following;
Be drilled with new height well horizontal segment take described side tracking point as starting point; Described new height well passes described novel targets, and 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 trajectory of horizontal is.
2. described method according to claim 1 is characterized in that, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
3. described method according to claim 2 is characterized in that, described new height well horizontal segment is higher than 2.5 meters to 4 meters of former horizontal well horizontal segments.
4. described method according to claim 1 is characterized in that, after described new height well passed novel targets, the angle in the orientation of new height well horizontal segment and former horizontal well trajectory of horizontal was greater than 8 degree.
5. described method according to claim 4 is characterized in that, described angle is 10 to 20 degree.
6. the means to save the situation of a coal bed gas multi-branch horizontal accident well 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;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
In horizontal well, above the packer and be the former kickoff point (KOP) top position of straight well section, set side tracking point;
Be drilled with new height well horizontal segment take described side tracking point as starting point in the mode of windowing; 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 trajectory of horizontal is; Described new height well horizontal segment passes described novel targets.
7. described method according to claim 6 is characterized in that, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
8. described method according to claim 7 is characterized in that, described new height well horizontal segment is higher than 2.5 meters to 4 meters of former horizontal well horizontal segments.
9. described method according to claim 6 is characterized in that, after described new height well horizontal segment 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.
10. described method according to claim 9 is characterized in that, described angle is 10 to 20 degree.
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| CN 201010286263 CN101975055B (en) | 2010-09-17 | 2010-09-17 | Method for remediating trouble well of coal bed gas multi-branch horizontal well |
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| CN 201010286263 CN101975055B (en) | 2010-09-17 | 2010-09-17 | Method for remediating trouble well of coal bed gas multi-branch horizontal well |
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| CN101975055B true CN101975055B (en) | 2013-03-06 |
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| US6280000B1 (en) * | 1998-11-20 | 2001-08-28 | Joseph A. Zupanick | Method for production of gas from a coal seam using intersecting well bores |
| US7243738B2 (en) * | 2001-01-29 | 2007-07-17 | Robert Gardes | Multi seam coal bed/methane dewatering and depressurizing production system |
| US6591903B2 (en) * | 2001-12-06 | 2003-07-15 | Eog Resources Inc. | Method of recovery of hydrocarbons from low pressure formations |
| US6964308B1 (en) * | 2002-10-08 | 2005-11-15 | Cdx Gas, Llc | Method of drilling lateral wellbores from a slant well without utilizing a whipstock |
| CA2525850C (en) * | 2003-06-09 | 2013-02-19 | Precision Drilling Technology Services Group, Inc. | Method for drilling with improved fluid collection pattern |
| CN1948702A (en) * | 2005-10-10 | 2007-04-18 | 中国石油天然气集团公司 | Well drilling method of multibranch well |
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