CN102003169B - 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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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-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, after fish refers to 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 affected.
At present, for the solution behind the fish 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 also can part.
But in some down-hole accident, fish can stay horizontal well and row adopts connectivity part 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 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, 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 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, 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-branch horizontal 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 the location positioning novel targets more than 1 meter on the connectivity points of straight well cave at the distance horizontal well with row;
S13, set side tracking point in horizontal well straight well section;
S14, be drilled with new height well horizontal segment 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 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.
Preferably, in embodiments of the present invention, the described fish that row is adopted in the straight well carries out the instrument of milling for adopting drilling rod to install junk mill additional or mill cone.
Preferably, in embodiments of the present invention, when described horizontal well inclination section when admittedly sealing without setting of casing, also comprise step before the step S14:
Row is adopted 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 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; To the horizontal well well sealing below the described side tracking point position;
Be drilled with new height well horizontal segment 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.
Preferably, in embodiments of the present invention, described solid envelope is for adopting cement admittedly to seal.
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 trajectory of horizontal 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.
Can find out from above-mentioned technical scheme, in the embodiment of the invention by above the previous level well, again being drilled with the horizontal well horizontal segment, make new height well horizontal segment and previous level well horizontal segment not on same level, even so the position of fish among row adopts straight well cave, also can not affect the well of new height well.Thereby got around former row and adopted fish in the straight well, avoided fish to stop up the impact 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 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 row adopts the fish in the 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 means to save the situation flow chart of the well of coal bed gas multi-branch horizontal accident described in the embodiment of the invention;
Fig. 2 is the means to save the situation flow chart of the well of coal bed gas multi-branch horizontal accident described in further embodiment of this invention;
Fig. 3 is the means to save the situation flow chart 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 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-branch horizontal 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, the follow-up use of adopting straight well in order not affect row at first will be carried out milling to the fish that the row of being stuck in adopts in the straight well, and is 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.Repeatedly locate to put in the cave to put by milling tool, until be hampered and the appearance of side scratch phenomenon, thereby so that adopting the straight well well, row recovers unobstructed.
S12, adopt on the connectivity points of the former cave of straight well location positioning novel targets more than 1 meter former horizontal well and 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.Owing to leaving fish in horizontal well well and the connectivity part that row adopts straight well, 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, adopt on the connectivity points of the former cave of straight well location positioning novel targets more than 1 meter former horizontal well and row; The well that the novel targets here refers to be drilled with horizontal well is adopted row needs the position passed through in the straight well.For fear of the impact of former connectivity points on 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 because the coal seam support force between new height well and the original cave is too small, and then impact is constructed.
S13, adopt the straight well section at horizontal well array and set side tracking point;
Owing in the embodiment of the 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 new side tracking point also need to be above the kickoff point (KOP) of horizontal well Central Plains.
S14, be drilled with new height well horizontal segment 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 the former horizontal well horizontal segment that described new height well trajectory of horizontal ground horizontal projection is; Described new height well passes described novel targets;
By above the previous level well, again being drilled with horizontal well, make new height well and previous level well not on same level, so even the position of fish is in row adopts among the straight well cave, also can not affect the well of new height well.Thereby got around and arranged the fish of adopting in the straight well, 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 horizontal projection of the track 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 the line tracking wraparound of a bow 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.
In embodiments of the present invention, again be drilled with horizontal well by the above position of adopting 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 effectively avoided the impact that row adopts fish in the 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 actual job, down-hole accident sometimes occurs is the horizontal well inclination section not setting of casing admittedly seal under the situation, this moment, concrete construction sequence can as shown in Figure 2, be specially:
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 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 admittedly to seal, 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 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.
In order to play the effect of better obstruct cement, in addition, also be 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.
S24, set side tracking point in horizontal well straight well section;
Owing in the embodiment of the 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 on former kickoff point (KOP).
S25, be locked in the following horizontal well well of described 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.
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 admittedly seal former horizontal well well can be blocked before adopting straight well cave to arranging, thereby can well guarantee the height of cement.
S26, be drilled with new height well horizontal segment 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 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.
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 occurs 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, because horizontal well has been finished setting of casing, so can use packer in sleeve pipe, to set, make the straight well section of horizontal well and inclination section, Connectivity Section and the row of horizontal well adopt straight well cave 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 section.
S34, 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; To the horizontal hole sealing below the described side tracking point position;
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 described side tracking point of cement sealing position to get final product with the section of going into the well.
S35, be drilled with new height well horizontal segment 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 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.
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 again being drilled with the horizontal well horizontal segment above the previous level well, the position of fish make new height well horizontal segment and previous level well horizontal segment not on same level, so even among row adopts straight well cave, also can not affect the well of new height well.Thereby got around former row and adopted fish in the straight well, avoided fish to stop up the impact 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 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 row adopts the fish in the 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.
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 (9)
1. the means to save the situation of a coal bed gas multi-branch horizontal accident well is characterized in that, comprises step:
S11, milling row adopt the fish in the straight well, described fish is pushed away row adopt the straight well well to reserve the space that is lowered to the pump string;
S12, 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;
S13, set side tracking point in horizontal well straight well section;
S14, be drilled with new height well horizontal segment 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 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.
2. described method according to claim 1 is characterized in that, described fish is pushed away row adopt the straight well well and comprise:
Described fish is milled the row of pushing away of having no progeny adopt the straight well well; The fish that row is adopted in the straight well carries out the instrument of milling for adopting drilling rod to install junk mill additional or mill cone.
3. described method according to claim 1 is characterized in that, when the inclination section of described horizontal well when admittedly sealing without setting of casing, also comprise step before the step S14:
Row is adopted straight well cave fill up sand and use drilling tool that sand is hit tight, 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. described method according to claim 1 is characterized in that, when the inclination section of described horizontal well when admittedly sealing through setting of casing, step S13 and step S14 specifically comprise:
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; To the horizontal hole sealing below the described side tracking point position;
Be drilled with new height well horizontal segment 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 track of described new height well trajectory of horizontal is; Described new height well passes described novel targets.
5. according to claim 3 or 4 described methods, it is characterized in that, described sealing is for adopting cement sealing.
6. described method according to claim 5 is characterized in that, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
7. described method according to claim 6 is characterized in that, described new height well horizontal segment is higher than 2 to 4 meters of former horizontal well horizontal segments.
8. described method according to claim 1 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.
9. described method according to claim 8 is characterized in that, described angle is 10 to 20 degree.
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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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| CN200982157Y (en) * | 2006-12-14 | 2007-11-28 | 中国石油天然气股份有限公司 | Quick production-resuming device for deep well litter of small well hole |
| CN200985757Y (en) * | 2006-07-20 | 2007-12-05 | 范伟光 | Milling shoe |
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| US5353876A (en) * | 1992-08-07 | 1994-10-11 | Baker Hughes Incorporated | Method and apparatus for sealing the juncture between a verticle well and one or more horizontal wells using mandrel means |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | Quick production-resuming device for deep well litter of small well hole |
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Denomination of invention: Method for repairing coal bed gas multi-branch horizontal accident well Effective date of registration: 20150925 Granted publication date: 20130109 Pledgee: Haidian Beijing science and technology enterprise financing Company limited by guarantee Pledgor: Beijing Aoruian Energy Source Tech. & Dev. Co., Ltd. Registration number: 2015990000827 |
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Date of cancellation: 20190117 Granted publication date: 20130109 Pledgee: Haidian Beijing science and technology enterprise financing Company limited by guarantee Pledgor: Beijing Aoruian Energy Source Tech. & Dev. Co., Ltd. Registration number: 2015990000827 |