CN105134162A - U-shaped well system and drilling method thereof - Google Patents
U-shaped well system and drilling method thereof Download PDFInfo
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- CN105134162A CN105134162A CN201510544068.0A CN201510544068A CN105134162A CN 105134162 A CN105134162 A CN 105134162A CN 201510544068 A CN201510544068 A CN 201510544068A CN 105134162 A CN105134162 A CN 105134162A
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Abstract
The invention provides a U-shaped well system and a drilling method thereof. The U-shaped well system comprises a straight well (10) and a horizontal well (20). The horizontal well (20) comprises a vertical well section (21), a horizontal well section (22) and a transition well section (23) connected between the vertical well section (21) and the horizontal well section (22). The end, away from the transition well section (23), of the horizontal well section (22) is communicated with the straight well (10). The horizontal well (20) further comprises an inclined branch well section (24), and one end of the inclined branch well section (24) is connected to the horizontal well section (22). According to the technical scheme, the problems that in the prior art, the control area of coalbed methane extraction is limited, and the extraction amount can be hardly improved can be 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: the U-shaped well that is docked and connected (straight well is communicated with horizontal well) of far-end, wherein horizontal segment does not all carry out pressure break.Due to horizontal segment all not pressure breaks, mining is large by the natural conditions restriction in coal seam, and the control area of mining is limited, and mining amount is difficult to be improved.
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 limited with the control area solving coal bed gas extraction of the prior art, mining amount is difficult to the problem be improved.
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, and horizontal well also comprises oblique Multilateral Wells section, and one end of oblique Multilateral Wells section is connected on net horizontal section.
Further, oblique Multilateral Wells section is multiple.
Further, multiple oblique Multilateral Wells section and net horizontal section are all located in the same horizontal plane.
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 coal seam or drill through coal seam formation straight well;
Step S20: creep into the Vertical Well section forming horizontal well above coal seam straight down;
Step S30: carry out directional inclination in the lower end of Vertical Well section, and be drilled into formation transition well section in coal seam;
Step S40: carry out horizontal drilling in transition well section away from one end of Vertical Well section and form the first net horizontal section;
Step S50: undertaken obliquely creeping into the oblique Multilateral Wells section of formation first by drilling tool in the first net horizontal section one end away from transition well section;
Step S60: return and drag drilling tool to move it in the first net horizontal section;
Step S70: proceed horizontal drilling and form the second net horizontal section, and the second net horizontal section is communicated with straight well;
Step S80: obtain U-shaped well system.
Further, step S60 also comprises: make drilling tool move preset distance along towards the direction of transition well section in the first net horizontal section, is undertaken obliquely creeping into the oblique Multilateral Wells section of formation second by drilling tool.
Further, also comprise between step S60 and step S70: step S61: repeat step S60 and form multiple second oblique Multilateral Wells section, return and drag drilling tool to move it in the first net horizontal section.
Further, also comprise between step S10 and step S20: step S11: in coal seam, reaming is formed and is communicated with cavity; Step S70 also comprises: make the second net horizontal section and be communicated with cavity and be communicated with.
Further, also comprise between step S70 and step S80: step S71: in the first net horizontal section and the second net horizontal section, screen casing is set.
Further, step S11 also comprises: obtain the positional information being communicated with cavity place.
Further, the first net horizontal section is positioned at the middle and upper part in coal seam.
Apply technical scheme of the present invention, the net horizontal section of horizontal well arranges oblique Multilateral Wells section.Above-mentioned oblique Multilateral Wells section is located in the coal seam around horizontal well, effectively can expand the contact area in U-shaped well system and coal seam, and improve the mining amount of coal bed gas, production effect is better.
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; 24, oblique Multilateral Wells section; 241, the first oblique Multilateral Wells section; 242, the second oblique Multilateral Wells section; 30, coal seam; 40, cavity is communicated with; 50, 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 individual layer coal in 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.Horizontal well 20 also comprises two oblique Multilateral Wells sections 24.One end of above-mentioned oblique Multilateral Wells section 24 is connected on net horizontal section 22.Above-mentioned two oblique Multilateral Wells sections 24 are all in same level with net horizontal section 22.
The U-shaped well system of application the present embodiment, the net horizontal section 22 of horizontal well 20 arranges oblique Multilateral Wells section 24.Above-mentioned oblique Multilateral Wells section 24 is located in the coal seam 30 around horizontal well 20, effectively can expand the contact area in U-shaped well system and coal seam 30, and improve the mining amount of coal bed gas, production effect is better.
It should be noted that, in the present embodiment, horizontal well 20 comprises two oblique Multilateral Wells sections 24, certainly, the quantity of oblique Multilateral Wells section 24 is not limited thereto, and in other embodiments unshowned in the drawings, oblique Multilateral Wells section 24 can be set to other quantity as required.
As shown in Figure 1, in the U-shaped well system of the present embodiment, two oblique Multilateral Wells sections 24 are located in the same horizontal plane with net horizontal section 22.Said structure can increase the contact area with the coal seam 30 of horizontal well about 20 both sides simultaneously, makes production effect better.Certainly, the setting direction of oblique Multilateral Wells section 24 is not limited thereto, and in other embodiments unshowned in the drawings, oblique Multilateral Wells section 24 also can be set to other angles with net horizontal section 22.
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 coal seam 30 straight down and form straight well 10;
Step S11: reaming is formed and is communicated with cavity 40 in coal seam 30, and obtains the positional information being communicated with cavity 40 place;
Step S20: creep into the Vertical Well section 21 forming horizontal well 20 above coal seam 30 straight down;
Step S30: carry out directional inclination in the lower end of Vertical Well section 21, and be drilled into formation transition well section 23 in coal seam 30;
Step S40: carry out horizontal drilling in transition well section 23 away from one end of Vertical Well section 21 and form the first net horizontal section 221;
Step S50: undertaken obliquely creeping into the oblique Multilateral Wells section 241 of formation first by drilling tool in the first net horizontal section 221 one end away from transition well section 23;
Step S60: return and drag drilling tool to move it in the first net horizontal section 221, makes drilling tool edge the first net horizontal section 221 in move preset distance towards the direction of transition well section 23, is undertaken obliquely creeping into the oblique Multilateral Wells section 242 of formation second by drilling tool;
Step S61: return and drag drilling tool to move it in the first net horizontal section 221;
Step S70: proceed horizontal drilling and form the second net horizontal section 222, and make the second net horizontal section 222 and be communicated with cavity 40 and be communicated with;
Step S71: screen casing 50 is set in the first net horizontal section 221 and the second net horizontal section 222;
Step S80: 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 coal seam 30 (about less than 30 60 meters, coal seam) 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, 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 coal seam 30, reaming is formed and is communicated with cavity 40, and under enter measuring apparatus and measure the positional information coordinate of connected chamber body 40 center (can for) being communicated with cavity 40 place.In addition, the position of creeping into of subsequent horizontal well 20 can be determined according to the positional information measuring the connection cavity 40 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 coal seam 30 again, in other embodiments, can first be measured by the well track parameter of measuring apparatus to straight well 10, first determine the position being communicated with cavity 40 and needing to arrange, carry out reaming in the position determined in coal seam 30 again, formed and be communicated with cavity 40.
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 coal seam 30 straight down.
As depicted in figs. 1 and 2, in the boring method of the present embodiment, when carrying out step S30 to step S40, first carrying out directional inclination in the lower end of Vertical Well section 21 and forming transition well section 23.Now, transition well section 23 is positioned at the middle and upper part (can be downward for the top from coal seam 30,1/3 place along coal seam 30 thickness) in coal seam 30 away from one end of Vertical Well section 21.After this, carry out horizontal drilling in the end of above-mentioned transition well section 23 and form the first net horizontal section 221.
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 S80, at one end (the i.e. design attitude of oblique Multilateral Wells section of the first net horizontal section 221 away from transition well section 23, the length of the first net horizontal section 221 can be determined according to the design attitude of this oblique Multilateral Wells section) carry out oblique creeping into by drilling tool, form the first oblique Multilateral Wells section 241.Meanwhile, the first oblique Multilateral Wells section 241 and the first net horizontal section 221 are located in the same horizontal plane.After the first oblique Multilateral Wells section 241 arrives projected depth, stop creeping into, return and drag drilling tool, and move it in the first net horizontal section 221.After this, make drilling tool move preset distance along towards the direction of transition well section 23 in the first net horizontal section 221, undertaken obliquely creeping into the oblique Multilateral Wells section 242 of formation second by drilling tool.Second oblique Multilateral Wells section 242 and the first oblique Multilateral Wells section 241, first net horizontal section 221 are located in the same horizontal plane.After the second oblique Multilateral Wells section 242 arrives projected depth, stop creeping into, return and drag drilling tool, and move it in the first net horizontal section 221, to having crept into of oblique Multilateral Wells section.After this, proceed horizontal drilling 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 and be communicated with cavity 40 and be communicated with.Now, the distance at the top in the axial line distance coal seam 30 of the first net horizontal section 221 and the second net horizontal section 222 is 1/3 of the thickness in coal seam 30.Meanwhile, screen casing 50 is set in the first net horizontal section 221 and the second net horizontal section 222, finally obtains U-shaped well system.Above-mentioned screen casing 50 plays the anti-blocking effect of sand prevention in coal bed gas extraction process, and meanwhile, screen casing 50 can prevent from coal geology from loosening blocking when subsiding the passage in the first net horizontal section 221 and the second net horizontal section 222, is conducive to mining safety, is convenient to follow-up well workover.The U-shaped well system of the present embodiment can expand the contact area with coal seam effectively, improves coal bed gas extraction effect.
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 extraction individual layer coal seam.Certainly, the range of application of the boring method of U-shaped well system is not limited thereto, and 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.
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 horizontal well (20) also comprises oblique Multilateral Wells section (24), and one end of described oblique Multilateral Wells section (24) is connected on described net horizontal section (22).
2. U-shaped well system according to claim 1, is characterized in that, described oblique Multilateral Wells section (24) is for multiple.
3. U-shaped well system according to claim 2, is characterized in that, described multiple oblique Multilateral Wells section (24) and described net horizontal section (22) are all located in the same horizontal plane.
4. a boring method for U-shaped well system, is characterized in that, comprise the following steps successively:
Step S10: creep into straight down in coal seam (30) or drill through described coal seam (30) formation straight well (10);
Step S20: creep into the Vertical Well section (21) forming horizontal well (20) to described coal seam (30) top straight down;
Step S30: carry out directional inclination in the lower end of described Vertical Well section (21), and be drilled into formation transition well section (23) in described coal seam (30);
Step S40: carry out horizontal drilling described transition well section (23) away from one end of described Vertical Well section (21) and form the first net horizontal section (221);
Step S50: undertaken obliquely creeping into the oblique Multilateral Wells section (241) of formation first by drilling tool in described first net horizontal section (221) one end away from described transition well section (23);
Step S60: return and drag described drilling tool to move it in described first net horizontal section (221);
Step S70: proceed horizontal drilling and form the second net horizontal section (222), and described second net horizontal section (222) is communicated with described straight well (10);
Step S80: obtain described U-shaped well system.
5. boring method according to claim 4, it is characterized in that, described step S60 also comprises: make described drilling tool move preset distance along towards the direction of described transition well section (23) in described first net horizontal section (221), is undertaken obliquely creeping into the oblique Multilateral Wells section (242) of formation second by described drilling tool.
6. boring method according to claim 5, is characterized in that, also comprises between described step S60 and described step S70:
Step S61: repeating said steps S60 forms multiple described second oblique Multilateral Wells section (242), returns and drags described drilling tool to move it in described first net horizontal section (221).
7. boring method according to claim 4, is characterized in that, also comprises between described step S10 and described step S20:
Step S11: reaming is formed and is communicated with cavity (40) in described coal seam (30);
Described step S70 also comprises: described second net horizontal section (222) is communicated with the described cavity (40) that is communicated with.
8. boring method according to claim 4, is characterized in that, also comprises between described step S70 and described step S80:
Step S71: screen casing (50) is set in described first net horizontal section (221) and described second net horizontal section (222).
9. boring method according to claim 7, is characterized in that, described step S11 also comprises: the positional information obtaining described connection cavity (40) place.
10. boring method according to claim 4, is characterized in that, described first net horizontal section (221) is positioned at the middle and upper part of described coal seam (30).
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| CN106640028A (en) * | 2017-03-06 | 2017-05-10 | 中国石油集团钻井工程技术研究院 | Completion method of enhanced geothermal system through communication and circulation of two wells |
| CN107642329A (en) * | 2017-11-14 | 2018-01-30 | 中国煤炭地质总局水文地质局 | A kind of process of the U-shaped docking geothermal well casings pipeline sealing operation of mid-deep strata |
| CN108150212A (en) * | 2017-11-29 | 2018-06-12 | 中国神华能源股份有限公司 | Extinguishing method |
| CN108643960A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | A kind of ground region band coal mine gas extinction technique |
| CN108716396A (en) * | 2018-03-30 | 2018-10-30 | 兰州城市学院 | A kind of development approach of coal bed gas multiple-limb distal end connected well |
| CN108825195A (en) * | 2018-04-28 | 2018-11-16 | 中国矿业大学 | A kind of coal bed gas horizontal well collapse hole makes cave release development system and method |
| CN108868740A (en) * | 2018-04-28 | 2018-11-23 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment method |
| CN109899054A (en) * | 2019-02-22 | 2019-06-18 | 中国石油天然气股份有限公司大港油田分公司 | Wellbore trace determines method and V-type well |
| 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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| CN106640028A (en) * | 2017-03-06 | 2017-05-10 | 中国石油集团钻井工程技术研究院 | Completion method of enhanced geothermal system through communication and circulation of two wells |
| CN107642329A (en) * | 2017-11-14 | 2018-01-30 | 中国煤炭地质总局水文地质局 | A kind of process of the U-shaped docking geothermal well casings pipeline sealing operation of mid-deep strata |
| CN108150212A (en) * | 2017-11-29 | 2018-06-12 | 中国神华能源股份有限公司 | Extinguishing method |
| CN108150212B (en) * | 2017-11-29 | 2020-04-24 | 中国神华能源股份有限公司 | Fire extinguishing method |
| CN108716396A (en) * | 2018-03-30 | 2018-10-30 | 兰州城市学院 | A kind of development approach of coal bed gas multiple-limb distal end connected well |
| CN108825195A (en) * | 2018-04-28 | 2018-11-16 | 中国矿业大学 | A kind of coal bed gas horizontal well collapse hole makes cave release development system and method |
| CN108868740A (en) * | 2018-04-28 | 2018-11-23 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment method |
| CN108868740B (en) * | 2018-04-28 | 2021-09-14 | 中国矿业大学 | Cave pressure relief mining simulation test method for tectonic coal in-situ coal bed gas horizontal well |
| CN108643960A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | A kind of ground region band coal mine gas extinction technique |
| CN109899054A (en) * | 2019-02-22 | 2019-06-18 | 中国石油天然气股份有限公司大港油田分公司 | Wellbore trace determines method and V-type well |
| 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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Application publication date: 20151209 |