CN1924291A - Process for gas collection by a well with one mouth and multiple branches drilled along coal layer - Google Patents
Process for gas collection by a well with one mouth and multiple branches drilled along coal layer Download PDFInfo
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- CN1924291A CN1924291A CN 200610069767 CN200610069767A CN1924291A CN 1924291 A CN1924291 A CN 1924291A CN 200610069767 CN200610069767 CN 200610069767 CN 200610069767 A CN200610069767 A CN 200610069767A CN 1924291 A CN1924291 A CN 1924291A
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Abstract
This invention relates to one gas collection process method from one well branch level coke layer, which adopts well spiral bar dynamic motor and diamond compound pad drilling and wireless inclination metering combined with earth guide control well hole drilling process method, wherein, the level well inclination section adopts double sections to control track and land points and sending point; controlling well hole track along coke layer from slide drilling and compound drilling type; ensuring well hole track transparency into coke layer through wireless drilling and gas measuring well and rock powder and gamma curve as earth guide.
Description
Affiliated technical field:
The present invention relates to an a kind of well multi-branched horizontal well and creep into process for gas collection, particularly relate to a kind of gas production body technology method of creeping into into well at coal seam horizontal well or multi-branched horizontal well along the coal seam along the coal seam.
Background technology:
At present, do not creep into into the gas production body technology method of well along the coal seam at dark coal seam horizontal well or multi-branched horizontal well, the most of employing bored peupendicular hole, finish the operation method of working seam gas through pressure break, its defective of peupendicular hole individual well is the equipment investment height, operation method complexity, production efficiency is low, is unfavorable for the utilization of large scale mining gas.
Summary of the invention:
Purpose of the present invention, provide an a kind of well multi-branched horizontal well and creep into process for gas collection along the coal seam, it is to utilize the wellbore screen cover is set in the horizontal hole, prevent that coal dust soil mud from stopping up the boring outlet passageway, on the first increasing hole angle section well fixed sleeving is set, adopts wireless drilling deviational survey direction finder and diamond compact to creep into and TRAJECTORY CONTROL drilling process method.Solve dark coal seam horizontal well or multi-branched horizontal well creep into into the gas production body of well along the coal seam process.
The present invention takes following technical scheme to realize, it is to adopt shaft bottom screw rod power motor and diamond compact bit and combining wireless to carry out the process that TRAJECTORY CONTROL is crept into boring the deviational survey direction finder, the horizontal well inclination section adopts two sections that increase, and controls the landing point of track and goes into the window point; Creep into the compound mode that combines of creeping into by slip and to come Controlling Borehole Trajectory to creep into, lead in conjunction with drilling-time log and gas detection logging and sieve residue log and gamma ray, guarantee the penetrance of well track in the coal seam by wireless drilling along the coal seam.
The operation method of horizontal well: the design of well is respectively vertical section and the first increasing hole angle section and second increasing hole angle section and the horizontal segment, creep into the deflecting borehole segments in dark coal seam and be arranged to two sections that increase, the first increasing hole angle section radius of curvature is bigger, being beneficial to the facility of finishing behind the well that draws water draws water down to sleeve bottom, the second increasing hole angle section radius of curvature is less, track enters dark coal seam after going out sleeve pipe fast, reduces the non-coal section that contains of bore hole hole section.The deflecting intensity of whole boring per 30 meters less than 9 degree, guaranteeing that drilling tool creeps in any hole section can both carry out that safety is compound creeps into.Wireless drilling deviational survey direction finder tracking drilling track in conjunction with drilling-time log and natural coffee horse curve and gas detection logging and sieve residue log, guarantees that well track creeps in dark coal seam.Adopt three major parameters of wireless drilling system transmissions well gradient and orientation and drilling tool face, calculate and grasp the space coordinates and the position of well track; Be a major parameter that creeps in the coal seam during brill, every meter speed of 2 minutes when usually creeping in the coal seam when creep at dirt band or roof and floor place, obviously strengthens during brill, is an outstanding feature of difference coal seam and roof and floor; When gas was surveyed and to be crept in the coal seam or near the roof, the overall diameter value was big, and it is less than normal to creep into the total hydrocarbon value in the mud stone; Gamma ray curve creeps into gamma value generally greater than 150API in mud stone, it is on the low side to creep into gamma ray curve in the coal seam, is generally less than 60API, and in conjunction with sieve residue log, to judge whether well track creeps into accuracy rate in the coal seam very high to comprehensive.
Hole trajectory control: the control of the point that lands, the i.e. terminal point of the first increasing hole angle section of point that lands is the terminal point of sleeve pipe lower going-into-well section, is controlling well section gradient and the orientation and the vertical depth at the some place of landing, and lands to select to be in 3-5 rice, gas production roof top.Go into the control of window point, go into the i.e. terminal point of the second increasing hole angle section of window point, track enter in the coal seam in and the coal seam roof and floor in the starting point of creeping into the design direction keeping parallelism.After the second increasing hole angle section screw rod drilling tool deflecting scope inner control track enters the coal seam, to creep into along the coal seam roof and floor is parallel, well section gradient and the vertical depth that the window point reaches gone in control, grasps the seam inclination angle along the coal seam drilling direction.Take to slide to creep into and creep into apart from level along coal seam length with the compound mode Controlling Borehole Trajectory that combines of creeping into, in the coal seam, creep into based on compound hold angle and creep into, well track enters coal seam roof and floor or dirt band, adopt the screw rod deflecting to slide and creep into the adjustment well track, bored non-coal section fast and enter the coal seam.
The sidetracking multi-branched horizontal well: multi-branched horizontal well is a plumage shape well, is the gas production of the well of improving the standard, and branch point is selected in the low coal seam of formation drillability, and the main borehole of its bifurcation is the increasing hole angle section.Sidetracking bit is the diamond compact flat bottom bit, protects the footpath thin thickness, is beneficial to wedging stratum side and goes out the branch horizontal well eye.The sidetracking mode is taked drop angle and drop angle to turn round the orientation or is turned round the orientation sidetracking with all strength, and the control drilling parameter at the uniform velocity keeps constant tool-face to creep into 3-6 rice with 1-2 rice per hour and can reach sidetracking and go out the branch horizontal well eye.
Protection coal seam cleanliness without any pollution: take wash boring liquid; control solids content of drilling fluid and proportion; because the coal seam drilling speed is very fast; ickings is many; creeping into a period of time needs to add the pollution-free detergent of a certain amount of high viscosity with pump in well and discharges coal dust, finishes and adopts water flushing, the drilling fluid in the replacement well before pulling out of hole behind the well; keep cleaning totally in the well, guarantee that outlet passageway is unimpeded.The wellbore screen cover is set in the coal seam, and wellbore screen puts and is provided with many small sircle holes, and coal seam gas enters in the screen casing by small sircle hole, keeps outlet pipe unblocked.
Effect of the present invention is that coal seam horizontal well gas producing technology method is simple, gas production output capacity height, and cost is low, and method of operating is flexible, and equipment investment is low, and a well has branch's gas well gas passage, is widely used in the gas production development and use of coal seam horizontal well.
Description of drawings:
The present invention will describe in further detail in conjunction with the accompanying drawings.
Fig. 1 is the two sectional drawings of coal seam of the present invention horizontal well inclination section.
Fig. 2 is a multiple-limb of the present invention coal seam horizontal well structural representation.
Fig. 3 is a deep water horizontal well wellbore screen nested structure schematic diagram of the present invention.
The 1--vertical section 2--first increasing hole angle section 3--second increasing hole angle section 4--horizontal segment 5--multi-branched horizontal well main borehole 6--branch well hole 7--wellbore screen 8--small sircle hole
The specific embodiment:
With reference to Fig. 1,2,3, the present invention's one well multi-branched horizontal well creeps into gas production body technology method along the coal seam, it is to adopt shaft bottom screw rod power motor to creep into combining wireless to carry out TRAJECTORY CONTROL drilling process method with boring the deviational survey direction finder, the horizontal well inclination section adopts two sections that increase, and controls the landing point of track and goes into the window point; Creep into the compound mode that combines of creeping into by slip and to come Controlling Borehole Trajectory to creep into, utilize wireless drilling to lead, guarantee the penetrance of well track in the coal seam in conjunction with drilling-time log and gas detection logging and sieve residue log and gamma curve along the coal seam.
The operation method of horizontal well: the design of well is respectively vertical section 1 and the first increasing hole angle section 2 and the second increasing hole angle section 3 and horizontal segment 4, horizontal well deflecting borehole segments is arranged to two sections that increase, the first increasing hole angle section, 2 radius of curvature are bigger, being beneficial to the facility of finishing behind the well that draws water draws water down to sleeve bottom, the second increasing hole angle section, 3 radius of curvature are less, track enters dark coal seam after going out sleeve pipe fast, reduces the non-coal section that contains of bore hole hole section.The deflecting intensity of whole boring per 30 meters less than 9 degree, guaranteeing that drilling tool creeps in any hole section can both carry out that safety is compound creeps into.Wireless drilling deviational survey direction finder tracking drilling track in conjunction with drilling-time log and natural coffee horse curve and gas detection logging and sieve residue log, guarantees that track creeps in the coal seam.Adopt three major parameters of wireless drilling system transmissions well gradient and orientation and drilling tool face, calculate and grasp the space coordinates and the position of well track; Be a major parameter that creeps in the coal seam during brill, every meter speed of 2 minutes when usually creeping in the coal seam obviously strengthens when boring when creep at dirt band or roof and floor place; When gas was surveyed and to be crept in the coal seam or near the roof, the total hydrocarbon value was big, and it is less than normal to creep into the total hydrocarbon value in the mud stone; Gamma ray curve creeps into gamma value generally greater than 150API in mud stone, it is on the low side to creep into gamma ray curve in the coal seam, is generally less than 60API, and in conjunction with sieve residue log, to judge whether well track creeps into accuracy rate in the coal seam very high to comprehensive.
Hole trajectory control: the control of the point that lands, the i.e. terminal point of the first increasing hole angle section 2 of point that lands is terminal points of sleeve pipe lower going-into-well section, is controlling well section gradient and the orientation and the vertical depth at the some place of landing, and lands to select to be in 3-5 rice, gas production roof top.Go into the control of window point, go into the i.e. terminal point of the second increasing hole angle section 3 of window point, track enter in the coal seam in and the coal seam roof and floor in the starting point of creeping into the design direction keeping parallelism.Creep into along the coal seam roof and floor is parallel after the second increasing hole angle section, 3 screw rod drilling tool deflecting scope inner control tracks enter the coal seam, well section gradient and the vertical depth that the window point reaches gone in control, grasps the seam inclination angle along the coal seam drilling direction.Horizontal gas recovery well adopts and creeps into apart from level along coal seam length, take to slide and creep into and the compound mode Controlling Borehole Trajectory that combines of creeping into, in the coal seam, creep into based on compound hold angle and creep into, well track enters coal seam roof and floor or dirt band, adopt the screw rod deflecting to slide and creep into the adjustment well track, bored non-coal section fast and enter the coal seam.
The sidetracking multi-branched horizontal well: multi-branched horizontal well main borehole 5 is for improving the success rate of sidetracking, and branch point is selected in the low coal seam of formation drillability, and the main borehole 5 of its bifurcation is increasing hole angle section or steady tilted section.Sidetracking bit is the composite sheet flat bottom bit, protects the footpath thin thickness, is beneficial to wedging stratum side and goes out branch horizontal well eye 6.The sidetracking mode is taked drop angle and drop angle to turn round the orientation and is turned round orientation mode sidetracking with all strength, and the control drilling parameter at the uniform velocity keeps constant tool-face to creep into 3-6 rice with 1-2 rice per hour and can reach sidetracking and go out branch horizontal well eye 6.
Protection coal seam cleanliness without any pollution: take wash boring liquid; control solids content of drilling fluid and proportion; because the coal seam drilling speed is very fast; ickings is many; creeping into a period of time needs to add the pollution-free detergent of a certain amount of high viscosity with pump in well and discharges coal dust, finishes and adopts water flushing, the drilling fluid in the replacement well before pulling out of hole behind the well; keep cleaning totally in the well, guarantee that outlet passageway is unimpeded.Wellbore screen 7 is set in the coal seam, and wellbore screen 7 is provided with many small sircle holes 8, keeps outlet pipe unblocked.
Claims (4)
1, an a kind of well multi-branched horizontal well creeps into process for gas collection along the coal seam, it is by shaft bottom screw rod power motor and compact bit, adopt wireless drilling deviational survey direction finder to carry out the process that TRAJECTORY CONTROL is crept into, it is characterized in that the horizontal well inclination section is arranged to two sections that increase, the landing point of control track and go into the window point; Creep into the compound mode that combines of creeping into by slip and to come Controlling Borehole Trajectory to creep into along the coal seam, make geosteering by wireless drilling in conjunction with drilling-time log and gas detection logging and sieve residue log and gamma curve, the operation method of horizontal well: the design of well is respectively vertical section (1) and the first increasing hole angle section (2) and the second increasing hole angle section (3) and horizontal segment (4), creep into the deflecting borehole segments in the coal seam and be arranged to two sections that increase, first increasing hole angle section (2) radius of curvature is bigger, being beneficial to the facility of finishing behind the well that draws water draws water down to sleeve bottom, second increasing hole angle section (3) radius of curvature is less, enter the coal seam fast after making well track go out sleeve pipe, reduce the non-coal section that contains of bore hole hole section, the deflecting intensity of whole boring per 30 meters less than 9 degree, guaranteeing that drilling tool creeps in any hole section can both carry out that safety is compound creeps into.
2, a well multi-branched horizontal well according to claim 1 creeps into process for gas collection along the coal seam, it is characterized in that hole trajectory control: the control of the point that lands, the i.e. terminal point of the first increasing hole angle section (2) of point lands, it is the terminal point of sleeve pipe lower going-into-well section, controlling well section gradient and the orientation and the vertical depth at the some place of landing, land to select and be in 3-5 rice, gas production roof top, go into the control of window point, go into the i.e. terminal point of the second increasing hole angle section (3) of window point, track enter in the coal seam with the coal seam roof and floor in the starting point of creeping into the design direction keeping parallelism, after the second increasing hole angle section (3) control track enters the coal seam, creep into along the coal seam roof and floor is parallel, well section gradient and the vertical depth that the window point reaches gone in control, grasps the seam inclination angle along the coal seam drilling direction.
3, a well multi-branched horizontal well according to claim 1 creeps into process for gas collection along the coal seam, it is characterized in that multi-branched horizontal well main borehole (5) is for improving the success rate of sidetracking, branch point is selected in the low coal seam of formation drillability, the main borehole of its bifurcation (5) is the increasing hole angle section, sidetracking bit is the diamond compact flat bottom bit, protect the footpath thin thickness, be beneficial to wedging stratum side and go out branch horizontal well eye (6), the sidetracking mode is taked drop angle and drop angle to turn round the orientation and is turned round the orientation sidetracking with all strength, the control drilling parameter at the uniform velocity keeps constant tool-face to creep into 3-6 rice with 1-2 rice per hour and can reach sidetracking and go out branch horizontal well eye (6).
4, a well multi-branched horizontal well according to claim 1 creeps into process for gas collection along the coal seam, it is characterized in that taking wash boring liquid, control solids content of drilling fluid and proportion, creep into a period of time needs and add the pollution-free detergent discharge of a certain amount of high viscosity coal dust toward the interior pump of well, finish and adopt water flushing before pulling out of hole behind the well, drilling fluid in the replacement well, wellbore screen (7) is set in the coal seam, wellbore screen (7) is provided with many small sircle holes (8), as the coal seam gas air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100697675A CN100412314C (en) | 2006-07-27 | 2006-07-27 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100697675A CN100412314C (en) | 2006-07-27 | 2006-07-27 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
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| Publication Number | Publication Date |
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| CN1924291A true CN1924291A (en) | 2007-03-07 |
| CN100412314C CN100412314C (en) | 2008-08-20 |
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| CNB2006100697675A Expired - Fee Related CN100412314C (en) | 2006-07-27 | 2006-07-27 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
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| CN101936154A (en) * | 2010-08-04 | 2011-01-05 | 北京奥瑞安能源技术开发有限公司 | Method for guiding drilling and bridging of horizontal coal bed methane well |
| CN101979828A (en) * | 2010-09-26 | 2011-02-23 | 北京奥瑞安能源技术开发有限公司 | Coal bed methane multi-branch horizontal well system and auxiliary discharge well thereof |
| CN101979826A (en) * | 2010-09-17 | 2011-02-23 | 北京奥瑞安能源技术开发有限公司 | Method for repairing coal bed gas multi-branch horizontal accident well |
| CN101985888A (en) * | 2010-10-25 | 2011-03-16 | 中联煤层气国家工程研究中心有限责任公司 | Method for draining gas of highly gassy coal mine |
| CN101994503A (en) * | 2010-09-17 | 2011-03-30 | 北京奥瑞安能源技术开发有限公司 | Production increasing method of coalbed gas |
| CN102071873A (en) * | 2010-12-21 | 2011-05-25 | 山西晋城无烟煤矿业集团有限责任公司 | Clean water drilling process of coal bed gas well |
| CN102080518A (en) * | 2011-01-17 | 2011-06-01 | 河南理工大学 | Method for extracting gas from coal seam roof complex branched well |
| CN101377124B (en) * | 2007-08-29 | 2011-12-28 | 王建生 | Horizontal bare hole flow guiding slot well and method for mining coal bed gas of sugarcoated haw well |
| CN101476463B (en) * | 2009-01-23 | 2012-07-25 | 丛山 | Drill-following natural gamma geosteering method for horizontal well |
| CN101498210B (en) * | 2008-12-18 | 2012-11-28 | 中国石油集团长城钻探工程有限公司 | Coal bed gas slim-hole hydraulic jet orienting fracturing yield increasing method |
| CN103161440A (en) * | 2013-02-27 | 2013-06-19 | 中联煤层气国家工程研究中心有限责任公司 | Single-well coalbed methane horizontal well system and finishing method thereof |
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| US5411104A (en) * | 1994-02-16 | 1995-05-02 | Conoco Inc. | Coalbed methane drilling |
| US6591903B2 (en) * | 2001-12-06 | 2003-07-15 | Eog Resources Inc. | Method of recovery of hydrocarbons from low pressure formations |
| US7073597B2 (en) * | 2003-09-10 | 2006-07-11 | Williams Danny T | Downhole draw down pump and method |
| RU2256079C1 (en) * | 2004-04-05 | 2005-07-10 | Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет) | Method for extracting methane from coal bed |
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| CN101377124B (en) * | 2007-08-29 | 2011-12-28 | 王建生 | Horizontal bare hole flow guiding slot well and method for mining coal bed gas of sugarcoated haw well |
| CN101498210B (en) * | 2008-12-18 | 2012-11-28 | 中国石油集团长城钻探工程有限公司 | Coal bed gas slim-hole hydraulic jet orienting fracturing yield increasing method |
| CN101476463B (en) * | 2009-01-23 | 2012-07-25 | 丛山 | Drill-following natural gamma geosteering method for horizontal well |
| CN101936154A (en) * | 2010-08-04 | 2011-01-05 | 北京奥瑞安能源技术开发有限公司 | Method for guiding drilling and bridging of horizontal coal bed methane well |
| CN101936154B (en) * | 2010-08-04 | 2014-02-26 | 北京奥瑞安能源技术开发有限公司 | Method for guiding drilling and bridging of horizontal coal bed methane well |
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| CN102080518B (en) * | 2011-01-17 | 2012-08-22 | 河南理工大学 | Method for extracting gas from coal seam roof complex branched well |
| CN102080518A (en) * | 2011-01-17 | 2011-06-01 | 河南理工大学 | Method for extracting gas from coal seam roof complex branched well |
| CN103161440A (en) * | 2013-02-27 | 2013-06-19 | 中联煤层气国家工程研究中心有限责任公司 | Single-well coalbed methane horizontal well system and finishing method thereof |
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| CN103924944B (en) * | 2013-09-11 | 2017-01-18 | 华北石油管理局 | Well abandoning operation method for coal-bed gas horizontal wells |
| CN106382096A (en) * | 2016-10-28 | 2017-02-08 | 中国石油大学(北京) | Multi-branch hole drill and multi-hole parallel drilling method |
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Granted publication date: 20080820 |