CN105156089A - U-shaped well system and well drilling method thereof - Google Patents
U-shaped well system and well drilling method thereof Download PDFInfo
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Abstract
The invention provides a U-shaped well system and a well drilling method thereof. The U-shaped well system comprises a vertical well (10) and a horizontal well (20), wherein the horizontal well (20) comprises a vertical well section (21), multiple horizontal well sections (22) and multiple transition well sections (23) connected between the vertical well section (21) and the horizontal well sections (22); the ends, far away from the transition well sections (23), of the horizontal well sections (22) are communicated with the vertical well (10); the multiple horizontal well sections (22) are arranged at intervals in the vertical direction; and the ends, far away from the horizontal well sections (22), of the transition well sections (23) are connected with the lower end of the vertical well section (21). By adopting the technical scheme, the problems that areas occupied by the horizontal well and the vertical well are large, the well drilling construction period is long and the drilling cost is high in the prior art are effectively solved.
Description
Technical field
The present invention relates to coal bed gas extraction technical field, in particular to the U-shaped well system of one and boring method thereof.
Background technology
At present, when the coal bed gas of two-layer coal carries out extraction in colliery, the ground usually adopted is communicated with pump drainage method and is with down-hole: arrange a bite directional horizontal wells and a bite straight well at every layer of coal respectively, wherein this directional horizontal wells creeps into this straight well and is communicated with; Or, respectively a bite directional horizontal wells is set at every layer of coal, and above-mentioned two mouthfuls of directional horizontal wellss are crept into same a bite straight well is communicated with.Greatly, the duration that drilling well needs is longer for directional horizontal wells in above-mentioned two kinds of methods and the floor space of straight well, and tubing consumption is large, and drilling cost is high.
Summary of the invention
Main purpose of the present invention is to provide a kind of U-shaped well system and boring method thereof, and large with the floor space solving horizontal well of the prior art and straight well, drilling well is long in time limit, the problem that drilling cost is high.
To achieve these goals, according to an aspect of the present invention, provide a kind of U-shaped well system, comprising: straight well; Horizontal well, there is Vertical Well section, net horizontal section and be connected to the transition well section between Vertical Well section and net horizontal section, net horizontal section is communicated with straight well away from one end of transition well section, Vertical Well Duan Weiyi, net horizontal section and transition well section are multiple, multiple net horizontal section vertically interval is arranged, and each transition well section is connected to the lower end of Vertical Well section away from one end of net horizontal section.
According to a further aspect in the invention, provide a kind of boring method of U-shaped well system, comprise the following steps successively:
Step S10: creep into straight down to underlying seam or drill through underlying seam formation straight well;
Step S20: creep into the Vertical Well section forming horizontal well above superjacent straight down;
Step S30: carry out first time directional inclination in the lower end of Vertical Well section, and be drilled into formation First Transition well section in underlying seam;
Step S40: carry out horizontal drilling in First Transition well section away from one end of Vertical Well section and form the first net horizontal section, and the first net horizontal section is communicated with straight well;
Step S50: carry out second time directional inclination in the lower end of Vertical Well section, and be drilled into formation the second transition well section in superjacent, the second transition well section is positioned at the top of First Transition well section;
Step S60: carry out horizontal drilling in the second transition well section away from one end of Vertical Well section and form the second net horizontal section, and the second net horizontal section is communicated with straight well;
Step S70: obtain U-shaped well system.
Further, also comprise between step S10 and step S20: step S11: in underlying seam, reaming forms the first connection cavity; Step S40 also comprises: make the first net horizontal section be communicated with cavity with first and be communicated with.
Further, also comprise between step S11 and step S20: step S12: in superjacent, reaming forms the second connection cavity; Step S60 also comprises: make the second net horizontal section be communicated with cavity with second and be communicated with.
Further, between step S11 and step S12, also step S111 is comprised: packer is set between the first connection cavity and superjacent and makes packer be in closed condition; Also step S121 is comprised: make packer be in open mode between step S12 and step S20.
Further, also comprise between step S40 and step S50: step S41: the first screen casing is set in the first net horizontal section.
Further, also comprise between step S40 and step S50: step S42: First Transition well section is cemented the well.
Further, also comprise between step S60 and step S70: step S61: the second screen casing is set in the second net horizontal section.
Further, step S11 also comprises: obtain the positional information that first is communicated with cavity place, step S12 also comprises: obtain the positional information that second is communicated with cavity.
Further, the first net horizontal section is positioned at the middle and upper part of underlying seam, and the second net horizontal section is positioned at the middle and upper part of superjacent.
Apply technical scheme of the present invention, horizontal well has a Vertical Well section, multiple net horizontal section and multiple transition well section.Wherein, multiple net horizontal section is connected to the lower end of Vertical Well section by multiple transition well section.Above-mentioned U-shaped well system decreases the quantity of well section, and floor space is less, and saves tubing consumption, and drilling cost is relatively low.Meanwhile, above-mentioned U-shaped well system is more prone to creep into, and the construction period is short.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of the embodiment according to U-shaped well system of the present invention; And
Fig. 2 shows the schematic flow sheet of the embodiment of the boring method according to U-shaped well system of the present invention.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
10, straight well; 20, horizontal well; 21, Vertical Well section; 22, net horizontal section; 221, the first net horizontal section; 222, the second net horizontal section; 23, transition well section; 231, First Transition well section; 232, the second transition well section; 31, underlying seam; 32, superjacent; 41, first is communicated with cavity; 42, second is communicated with cavity; 50, packer; 61, the first screen casing; 62, the second screen casing.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, the U-shaped well system of the present embodiment is used for the coal bed gas of the two-layer coal in synchronous extraction colliery.This U-shaped well system comprises straight well 10 and horizontal well 20.Wherein, horizontal well 20 has Vertical Well section 21, net horizontal section 22 and is connected to the transition well section 23 between Vertical Well section 21 and net horizontal section 22.Net horizontal section 22 is communicated with straight well 10 away from one end of transition well section 23.Vertical Well section 21 is one.Net horizontal section 22 and transition well section 23 are two.Two net horizontal sections 22 are vertically arranged at interval.Each transition well section 23 is connected to the lower end of Vertical Well section 21 away from one end of net horizontal section 22.
The U-shaped well system of application the present embodiment, horizontal well 20 has a Vertical Well section 21, two net horizontal sections 22 and two transition well sections 23.Wherein, two net horizontal sections 22 are connected to the lower end of Vertical Well section 21 by two transition well sections 23.Above-mentioned U-shaped well system decreases the quantity of well section, and floor space is less, and saves tubing consumption, and drilling cost is relatively low.Meanwhile, above-mentioned U-shaped well system is more prone to creep into, and the construction period is short.
It should be noted that, in the present embodiment, horizontal well 20 comprises two net horizontal sections 22 and two transition well sections 23, certainly, the quantity of net horizontal section 22 and transition well section 23 is not limited thereto, in other embodiments unshowned in the drawings, net horizontal section 22 and transition well section 23 can be set to other quantity as required, and need to ensure that the quantity of net horizontal section 22 is identical with the quantity of transition well section 23.
Present invention also provides a kind of boring method of U-shaped well system.The boring method of the present embodiment is used for creeping into above-mentioned U-shaped well system.Particularly, as depicted in figs. 1 and 2, above-mentioned boring method comprises the following steps successively:
Step S10: drill through underlying seam 31 straight down and form straight well 10;
Step S11: reaming forms the first connection cavity 41 in underlying seam 31, and obtains the positional information at the first connection cavity 41 place;
Step S111: packer 50 is set between the first connection cavity 41 and superjacent 32 and makes packer 50 be in closed condition;
Step S12: reaming forms the second connection cavity 42 in superjacent 32, and obtains the positional information of the second connection cavity 42;
Step S121: make packer 50 be in open mode;
Step S20: creep into the Vertical Well section 21 forming horizontal well 20 above superjacent 32 straight down;
Step S30: carry out first time directional inclination in the lower end of Vertical Well section 21, and be drilled into formation First Transition well section 231 in underlying seam 31;
Step S40: carry out horizontal drilling in First Transition well section 231 away from one end of Vertical Well section 21 and form the first net horizontal section 221, and make the first net horizontal section 221 be communicated with cavity 41 with first to be communicated with;
Step S41: the first screen casing 61 is set in the first net horizontal section 221;
Step S42: First Transition well section 231 is cemented the well;
Step S50: carry out second time directional inclination in the lower end of Vertical Well section 21, and the top being drilled into that the interior formation of superjacent 32 second transition well section 232, second transition well section 232 is positioned at First Transition well section 231;
Step S60: carry out horizontal drilling in the second transition well section 232 away from one end of Vertical Well section 21 and form the second net horizontal section 222, and make the second net horizontal section 222 be communicated with cavity 42 with second to be communicated with;
Step S61: the second screen casing 62 is set in the second net horizontal section 222;
Step S70: obtain U-shaped well system.
As shown in Figure 2, in the boring method of the present embodiment, before carrying out step S10, the ground rock in the tunnel dug first as required moves the well head position on the ground that straight well 10 is determined at angle.Recycling rig carries out step S10 at ground construction, and the drill bit by rig drills through underlying seam 31 (underlying seam about less than 31 60 meters) straight down, forms straight well 10.
As depicted in figs. 1 and 2, in the boring method of the present embodiment, when carrying out step S11 to step S121, can first in straight well 10 under enter sleeve pipe, reaming bit (diameter is greater than 500 millimeters) is entered for 10 times again along above-mentioned straight well, in underlying seam 31 reaming formed first be communicated with cavity 41, and under enter the positional information (can be the coordinate at the first connection cavity 41 center) that the first connection cavity 41 place measured by measuring apparatus.After this, between the first connection cavity 41 and superjacent 32, put into packer 50 and make packer 50 be in closed condition, separating superjacent 32 and underlying seam 31 with this.After closedown packer 50, use above-mentioned reaming bit (diameter is greater than 500 millimeters) reaming in superjacent 32 to form second and be communicated with cavity 42, and obtain by above-mentioned measuring apparatus the positional information (can be the coordinate at the second connection cavity 42 center) that second is communicated with cavity 42.Open packer 50 more afterwards, make the first connection cavity 41 be communicated with cavity 42 with second and be communicated with.Separate superjacent 32 and underlying seam 31 by above-mentioned packer 50, can not have influence on below when carrying out reaming to superjacent 32 first can be made to be communicated with cavity 41.Meanwhile, packer 50 is elastic sealing elements, uses this packer 50 can annular space between packing various sizes pipe box and well and between pipe box, isolated superjacent 32 and underlying seam 31.In addition, the position of creeping into of subsequent horizontal well 20 can be determined with the second positional information being communicated with cavity 42 according to measuring the first connection cavity 41 drawn, can ensure the positional accuracy of each well section in U-shaped well system like this.
It should be noted that, the boring method of the present embodiment measures its position after carrying out reaming to superjacent 32 and underlying seam 31 again, in other embodiments, can first be measured by the well track parameter of measuring apparatus to straight well 10, first determine the first connection cavity 41 is communicated with the setting of cavity 42 needs position with second, carry out reaming in the position determined of superjacent 32 and underlying seam 31 again, form the first connection cavity 41 and be communicated with cavity 42 with second.
As shown in Figure 2, in the boring method of the present embodiment, before carrying out step S20, first need according to ground condition, coal seam situation and concrete size the pithead position choosing horizontal well 20.Recycling rig carries out step S20 at ground construction, and the drill bit by rig creeps into the Vertical Well section 21 forming horizontal well 20 above superjacent 32 straight down.
As depicted in figs. 1 and 2, in the boring method of the present embodiment, when carrying out step S30 to step S42, first carry out first time directional inclination in the lower end of Vertical Well section 21.Before carrying out first time directional inclination, arrive kickoff point (KOP) (starting point of deflecting hole section) after first can creeping into a segment distance along the direction perpendicular to underlying seam 31, after this carry out deflecting operation again and form deflecting hole section.Form First Transition well section 231 when drilling tool is drilled into after in underlying seam 31, in the present embodiment, First Transition well section 231 comprises deflecting hole section and is positioned at the vertical section of a part above kickoff point (KOP).Now, First Transition well section 231 is positioned at the middle and upper part (can for from the top of underlying seam 31 downwards, 1/3 place along underlying seam 31 thickness) of underlying seam 31 away from one end of Vertical Well section 21.After this, carry out horizontal drilling in the end of above-mentioned First Transition well section 231 and form the first net horizontal section 221, and adopt Technology of Directional Drilling and rotary steering technology to make the first net horizontal section 221 be communicated with cavity 41 with first to be communicated with.Now, the distance at the top of the axial line distance underlying seam 31 of the first net horizontal section 221 is 1/3 of the thickness of underlying seam 31.Meanwhile, arrange the first screen casing 61 in the first net horizontal section 221, thus play the effect of sand prevention in coal bed gas extraction process, meanwhile, the first screen casing 61 can prevent from coal geology from loosening blocking when subsiding the passage in the first net horizontal section 221.After this, by cement, First Transition well section 231 is cemented the well, the fastness of First Transition well section 231 can be ensured like this, to superjacent 32 carry out second time directional inclination time drill bit play a supporting role, be easier to second time directional inclination success.
It should be noted that, the drill string that the deflecting tool that directional inclination uses is made up of drill bit, mud motor, deflecting tool, drill collar, drilling rod, this drill string is in free bent state before entering well.After entering well, the bending restriction being subject to the borehole wall of drill string, and make drill bit produce skew force to the borehole wall, in addition, drill axis does not overlap with borehole axis, thus produces the horizontal broken to the borehole wall and the asymmetric fragmentation to shaft bottom, drives in bit process at mud motor, deflecting tool does not rotate, and this just ensures that well reaches the object of deflecting towards certain orientation deflection certain angle.
As depicted in figs. 1 and 2, in the boring method of the present embodiment, when carrying out step S50 to step S70, carry out second time directional inclination in the lower end of Vertical Well section 21, and be drilled into formation the second transition well section 232 in superjacent 32.Now, second transition well section 232 is positioned at the top of First Transition well section 231, second transition well section 232 is positioned at the middle and upper part (can for from the top of superjacent 32 downwards, 1/3 place along superjacent 32 thickness) of superjacent 32 away from one end of Vertical Well section 21.After this, carry out horizontal drilling in the end of above-mentioned second transition well section 232 and form the second net horizontal section 222, and adopt Technology of Directional Drilling and rotary steering technology to make the second net horizontal section 222 be communicated with cavity 42 with second to be communicated with.Now, the distance at the top of the axial line distance superjacent 32 of the second net horizontal section 222 is 1/3 of the thickness of superjacent 32.Meanwhile, the second screen casing 62 is set in the second net horizontal section 222, thus plays the anti-blocking effect of sand prevention in coal bed gas extraction process.Finally, U-shaped well system is obtained.After the U-shaped well system of formation, enter extraction equipment under in straight well 10 or horizontal well 20, thus realize effective pump drainage coal bed gas.
It should be noted that, in the present embodiment, the boring method of U-shaped well system is for creeping into the U-shaped well system in the two-layer coal seam of extraction.Certainly, the range of application of the boring method of U-shaped well system is not limited thereto, in other embodiments unshowned in the drawings, above-mentioned boring method may be used for the U-shaped well system of creeping into extraction multilayer coal seam, now, underlying seam and superjacent are not defined as specific two coal seams, but represent being in the coal seam on top and being in the coal seam of bottom in multiple coal seam.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a U-shaped well system, comprising:
Straight well (10);
Horizontal well (20), the transition well section (23) that there is Vertical Well section (21), net horizontal section (22) and be connected between described Vertical Well section (21) and described net horizontal section (22), described net horizontal section (22) is communicated with described straight well (10) away from one end of described transition well section (23)
It is characterized in that,
Described Vertical Well section (21) is one, described net horizontal section (22) and described transition well section (23) are multiple, multiple described net horizontal section (22) vertically interval is arranged, and each described transition well section (23) is connected to the lower end of described Vertical Well section (21) away from one end of described net horizontal section (22).
2. a boring method for U-shaped well system, is characterized in that, comprise the following steps successively:
Step S10: creep into straight down to underlying seam (31) or drill through described underlying seam (31) formation straight well (10);
Step S20: creep into the Vertical Well section (21) forming horizontal well (20) to superjacent (32) top straight down;
Step S30: carry out first time directional inclination in the lower end of described Vertical Well section (21), and be drilled into formation First Transition well section (231) in described underlying seam (31);
Step S40: carry out horizontal drilling described First Transition well section (231) away from one end of described Vertical Well section (21) and form the first net horizontal section (221), and described first net horizontal section (221) is communicated with described straight well (10);
Step S50: carry out second time directional inclination in the lower end of described Vertical Well section (21), and being drilled into formation the second transition well section (232) in described superjacent (32), described second transition well section (232) is positioned at the top of described First Transition well section (231);
Step S60: carry out horizontal drilling in described second transition well section (232) away from one end of described Vertical Well section (21) and form the second net horizontal section (222), and described second net horizontal section (222) is communicated with described straight well (10);
Step S70: obtain described U-shaped well system.
3. boring method according to claim 2, is characterized in that,
Also comprise between described step S10 and described step S20: step S11: in described underlying seam (31), reaming forms the first connection cavity (41);
Described step S40 also comprises: make described first net horizontal section (221) be communicated with cavity (41) with described first and be communicated with.
4. boring method according to claim 3, is characterized in that,
Also comprise between described step S11 and described step S20: step S12: in described superjacent (32), reaming forms the second connection cavity (42);
Described step S60 also comprises: make described second net horizontal section (222) be communicated with cavity (42) with described second and be communicated with.
5. boring method according to claim 4, it is characterized in that, between described step S11 and described step S12, also comprise step S111: packer (50) is set between described first connection cavity (41) and described superjacent (32) and makes described packer (50) be in closed condition; Also step S121 is comprised: make described packer (50) be in open mode between described step S12 and described step S20.
6. boring method according to claim 2, is characterized in that, also comprises between described step S40 and described step S50:
Step S41: the first screen casing (61) is set in described first net horizontal section (221).
7. boring method according to claim 6, is characterized in that, also comprises between described step S40 and described step S50:
Step S42: described First Transition well section (231) is cemented the well.
8. boring method according to claim 2, is characterized in that, also comprises between described step S60 and described step S70:
Step S61: the second screen casing (62) is set in described second net horizontal section (222).
9. boring method according to claim 4, it is characterized in that, described step S11 also comprises: obtain the positional information that described first is communicated with cavity (41) place, described step S12 also comprises: obtain the positional information that described second is communicated with cavity (42).
10. boring method according to claim 2, it is characterized in that, described first net horizontal section (221) is positioned at the middle and upper part of described underlying seam (31), and described second net horizontal section (222) is positioned at the middle and upper part of described superjacent (32).
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| CN201510544218.8A CN105156089A (en) | 2015-08-28 | 2015-08-28 | U-shaped well system and well drilling method thereof |
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| CN106869875A (en) * | 2017-01-05 | 2017-06-20 | 中国神华能源股份有限公司 | The method for exploiting two-layer coal bed gas |
| CN107083947A (en) * | 2017-05-23 | 2017-08-22 | 中国神华能源股份有限公司 | The gang of wells and its process for constructing of synchronous extraction coal bed gas up and down |
| CN107083948A (en) * | 2017-06-16 | 2017-08-22 | 新疆国利衡清洁能源科技有限公司 | A kind of coal underground gasifying furnace furnace body structure and construction method |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
| CN109403926A (en) * | 2018-10-31 | 2019-03-01 | 中国神华能源股份有限公司 | Implement the method for the coal bed gas of underground mining multilayer coal in a main entry |
| CN109595834A (en) * | 2018-11-29 | 2019-04-09 | 中国水利水电科学研究院 | A kind of radial U-shaped geothermal exploitation method of combination |
| CN111520119A (en) * | 2020-04-28 | 2020-08-11 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN111905906A (en) * | 2020-07-29 | 2020-11-10 | 中国石油化工股份有限公司 | Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof |
| CN112343555A (en) * | 2020-11-24 | 2021-02-09 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
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| CN106869875B (en) * | 2017-01-05 | 2019-06-07 | 中国神华能源股份有限公司 | The method for exploiting two layers of coal bed gas |
| CN106869875A (en) * | 2017-01-05 | 2017-06-20 | 中国神华能源股份有限公司 | The method for exploiting two-layer coal bed gas |
| CN107083947A (en) * | 2017-05-23 | 2017-08-22 | 中国神华能源股份有限公司 | The gang of wells and its process for constructing of synchronous extraction coal bed gas up and down |
| CN107083947B (en) * | 2017-05-23 | 2020-05-01 | 中国神华能源股份有限公司 | Well group for extracting coal bed gas synchronously from top and bottom and construction method thereof |
| CN107083948A (en) * | 2017-06-16 | 2017-08-22 | 新疆国利衡清洁能源科技有限公司 | A kind of coal underground gasifying furnace furnace body structure and construction method |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
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| CN109595834B (en) * | 2018-11-29 | 2020-07-10 | 中国水利水电科学研究院 | Radial combined U-shaped geothermal heat development method |
| CN111520119A (en) * | 2020-04-28 | 2020-08-11 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN111520119B (en) * | 2020-04-28 | 2022-04-08 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN111905906A (en) * | 2020-07-29 | 2020-11-10 | 中国石油化工股份有限公司 | Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof |
| CN111905906B (en) * | 2020-07-29 | 2021-07-06 | 中国石油化工股份有限公司 | Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof |
| CN112343555A (en) * | 2020-11-24 | 2021-02-09 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
| CN112343555B (en) * | 2020-11-24 | 2022-11-18 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
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