CN102747999A - Method for developing coal bed gas by deeply penetrating radial horizontal well by hydraulic power - Google Patents
Method for developing coal bed gas by deeply penetrating radial horizontal well by hydraulic power Download PDFInfo
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- CN102747999A CN102747999A CN2011100966314A CN201110096631A CN102747999A CN 102747999 A CN102747999 A CN 102747999A CN 2011100966314 A CN2011100966314 A CN 2011100966314A CN 201110096631 A CN201110096631 A CN 201110096631A CN 102747999 A CN102747999 A CN 102747999A
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Abstract
The invention provides a method for developing coal bed gas by deeply penetrating a radial horizontal well by hydraulic power. The method is used for a well for forming a production casing by casing cementing. The method comprises the following steps of: step 1: putting down a guide device (9) and positioning; step 2: putting down a milling drill bit (13) and drilling a guide hole with a pre-set diameter on the production casing; and step 3: putting down a jet spraying nozzle (15); self-propelling the jet spraying nozzle (15) to a target coal bed under the effect of a high-pressure water jet after the jet spraying nozzle passes through the guide hole of the casing to form a horizontal hole with a pre-set diameter and a pre-set depth. Therefore, a coal bed gas exploiting channel is established and the requirements of the exploiting rate of the coal bed gas are met.
Description
Technical field
The present invention relates to the method for coal-bed gas exploitation field waterpower deep penetration radial level well development coal bed gas, is exactly a kind of method that is used to improve the waterpower deep penetration radially horizontal well of coal bed gas well yield and recovery ratio specifically.
Background technology
Peupendicular hole and horizontal well technology are the main hole patterns of current ground drilling coal bed gas.Peupendicular hole mining type gas production is big, resource recovery is high, mobility strong, can form scale and benefit.But it requires, and favourable orographic condition, thickness are big, permeability coal seam or coal seam group preferably.Horizontal well is exactly to beat earlier straight well deflecting again from ground, and the horizontal well drilling along the coal seam (well or title cluster well) when in the coal seam, beating some horizontal branch, is called branch horizontal well or pinniform horizontal well again.The increasing yield of coal bed gas multi-branched horizontal well has been to break through scope and the line of single horizontal well or the limitation of leptoprosopy of original straight well point; Realized the effect of wide area face; Can link up the cracks in coal seam system on a large scale; Enlarge coal seam step-down scope, the frictional resistance when reducing coal seam water discharge, thus increase substantially well yield and recovery ratio.
Simultaneously; Hydraulic fracturing technology also is the well stimulation that present cbm development generally adopts, and this is because the natural crack network in the coal seam has been strengthened in the nearly well injury of inducing the crack reduction or having eliminated the coal seam that artificial fracturing forms; Effectively " well radius " and coal bed gas desorb seepage area have been enlarged; Strengthened hole stability, formed effective coal-bed methane seepage passage, effectively improved the coal bed gas well capacity in wellbore.
Summary of the invention
The technical problem that the present invention will solve just provides a kind of waterpower deep penetration radial level well development coal bed gas method.
The objective of the invention is to present situation, a kind of exploitation coal bed gas method that penetration depth is long, directional effect good, cost is low, can effectively improve the coal-bed gas exploitation rate that possesses is provided to the present coal-bed gas exploitation of China.
According to an aspect of the present invention, a kind of method of utilizing waterpower deep penetration radial level well development coal bed gas is provided, this method is used for the well of casing cementing formation production casing.This method comprises: the first step: be lowered to guider and location; Second step: be lowered to junk bit, and on production casing, bore and drive pilot hole; The 3rd step: be lowered to jet nozzle, jet nozzle is through spraying the horizontal eyelet of formation to target coal seam self-propelled behind the pilot hole of sleeve pipe under the effect of high-pressure water jet.
Preferably, the jet nozzle that is lowered in the 3rd step comprises jet nozzle and high-pressure injection flexible pipe is connected on the coiled tubing, G.I.H together then, arrival desired depth rear nozzle and high-pressure hose in guider by the vertical duction level.
Preferably, jet nozzle comprises that forward direction nozzle and back are to nozzle.Preferably, the self-propelled in the 3rd step is sprayed and can be comprised behind jet nozzle target approach coal seam, under " from tractive force " effect of nozzle, utilizes the hydraulic energy erosion cutting coal seam of forward direction nozzle generation in the back.In addition, the 3rd step can also comprise treats that horizontal hole creeps into after length reaches design length, slowly reclaims the high-pressure injection flexible pipe, the hydraulic energy erosion coal seam reaming that utilizes the back to produce to nozzle, thus form horizontal eyelet.
Preferably, being lowered to guider and locating in the first step comprises: utilize oil pipe that guider is lowered to target coal seam, and by the magnetic orientator depthkeeping.Preferably, this method also comprises by gyroscope and comes to be that guider is directed.
Preferably, wherein the guider that is lowered to of the first step comprises and utilizes workover rig that guider is lowered into the target coal seam assigned address.
Preferably, wherein the first step can also be included in well head and install the oil pipe four-way, and loads onto well head blowout prevention box, and well head blowout prevention box directly is connected on tubing hanger top connection place, couples together with hydraulic line between hydraulic hand-pump and the well head blowout prevention box.
Preferably, wherein the junk bit that is lowered in second step comprises and connects down-hole motor, flexible shaft and junk bit on the ground that down-hole motor is connected with coiled tubing through flexible hose.
Preferably, wherein the moment of torsion and the rotating speed of down-hole motor generation pass to junk bit through flexible shaft, and flexible shaft also plays the effect of transmitting the pressure of the drill, drives a pilot hole thereby junk bit bores on production casing.
The multi-branched horizontal well technology is suitable for exploiting the hyposmosis bed gas reservoir, compares with the conventional straight well that adopts perforation completion and fracturing to increase production to have irreplaceable superiority.The advantage of multi-branched horizontal well technology mainly contains following several respects:
(1) increases the effective supply scope.Multi-branched horizontal well is net distribution in the coal seam, the coal seam is divided into a lot of continuous long and narrow bands, thereby increases the supply scope of coal bed gas greatly.
(2) improve the coal seam flow conductivity.The crack of pressure break no matter length how long, the resistance that flows all is sizable, and the flow resistance of horizontal well inner fluid wants much little with respect to the hugger system.
(3) minimizing is to the injury in coal seam.Fracturing is transformed and can be produced the injury that is difficult to recovery to coal bed texture.
(4) the individual well drilling cost is low, and output is high.Adopt the multi-branched horizontal well development technique; The individual well cost is higher than straight well; But a relatively large block exploitation, just reduced drilling hole number, preliminary work for spudding, drilling completion material consumption etc., integrated cost is low; And output is 3～10 times of conventional straight well, and recovery percent of reserves on average exceeds more than 2 times.
(5) help environmental protection.Same productive area, because drilling hole number is few, the surface construction floor space is few, and is minimum to the ground environmental injury.
Description of drawings
Fig. 1 is the sketch map of milling cannula system of the present invention;
Fig. 2 is the sketch map of radial level hole-drilling system of the present invention;
Fig. 3 is the sketch map of jet nozzle of the present invention.
The specific embodiment
Describe a kind of waterpower deep penetration radial level well development coal bed gas method proposed by the invention in detail below in conjunction with accompanying drawing; This cover method equipment mainly comprises: ground installation, wellhead assembly and downhole tool.Wherein ground installation mainly contains vehicular coild tubing unit (1), coiled tubing (2) and coiled tubing guiding device (3), and coiled tubing (2) is wrapped on the vehicular coild tubing unit (1); Wellhead assembly mainly contains well head blowout prevention box (4), hydraulic hand-pump (5), oil pipe four-way (6) etc.; Downhole tool mainly contains oil pipe (7), centralizer (8), down-hole guider (9), flexible hose (10), down-hole motor (11), flexible shaft (12), junk bit (13), high-pressure injection flexible pipe (14) and jet nozzle (15) etc.
Adopted term " level " and " vertical " in the explanation among the present invention, note this two term be not the requirement abswolute level with vertical, and only be requirement approximate horizontal and approximate vertical, it can depart from level and vertical orientated slightly according to actual conditions.
This method adopts the form of substep to implement the boring of deep penetration radial level.
This method comprises:
The first step: be lowered to guider (9) and location;
Second step: be lowered to junk bit (13), drive a pilot hole thereby on production casing, bore;
The 3rd step: be lowered to jet nozzle (15), jet nozzle (15) is through spraying horizontal eyelet of formation to target coal seam self-propelled behind the pilot hole of sleeve pipe under the effect of high-pressure water jet.
In a preferred embodiment, the guider (9) that is lowered to of the first step comprises and utilizes workover rig that guider (9) is lowered into the target coal seam assigned address.
More preferably, the first step can also be included in well head and install oil pipe four-way (6), and loads onto well head blowout prevention box (4), and well head blowout prevention box (4) directly is connected on tubing hanger top connection place, couples together with hydraulic line between hydraulic hand-pump (5) and the well head blowout prevention box (4).
In a preferred embodiment; Second step also comprised and connects down-hole motor (11), flexible shaft (12) and junk bit (13) on the ground; Down-hole motor (11) is connected with coiled tubing (2) through flexible hose (10), and moment of torsion and rotating speed that down-hole motor (11) produces pass to junk bit (13) through flexible shaft (12).
In addition, flexible shaft (12) also plays the effect of transmitting the pressure of the drill, drives a pilot hole thereby junk bit (13) bores on production casing.
In a preferred embodiment, jet nozzle comprises that forward direction nozzle and back are to nozzle.
Preferably; The 3rd step tripped out down-hole motor (11) after comprising that also casing milling finishes, and jet nozzle (15) and high-pressure injection flexible pipe (14) are connected on the coiled tubing (2) G.I.H together; Behind jet nozzle (15) target approach coal seam; Under " from tractive force " effect of nozzle, the coal seam is cut in the hydraulic energy erosion that utilizes the forward direction nozzle to produce in the back, and the speed that the high-pressure injection flexible pipe advances is very fast.
The 3rd step also comprised in a preferred embodiment, treated that horizontal hole creeps into after length reaches design length, slowly reclaims the high-pressure injection flexible pipe, the hydraulic energy erosion coal seam reaming that utilizes the back to produce to nozzle.Thereby form a horizontal eyelet.Through increasing the contact area of hole and coal seam reservoirs effectively, thereby increase the pressure release area of coal seam reservoirs, enlarge the desorb scope of coal bed gas, improve the well yield of coal bed gas well and the recovery ratio of coal bed gas.
According to another embodiment of the present invention, the invention provides a kind of method of waterpower deep penetration radial level well development coal bed gas.Earlier beat a bite straight well and pass seat earth, then casing cementing from ground.In addition, this method also is applicable in through the gasser after the pressure break and constructs.This method mainly divides three steps to implement deep penetration radial level well operations:
The first step is lowered to guider, utilizes oil pipe that guider is lowered to target coal seam, and by the magnetic orientator depthkeeping, in case of necessity can be directed by gyroscope.
The second step milling sleeve pipe is connected the down-hole motor lower end with junk bit and flexible shaft, utilizes coiled tubing with the down-hole motor G.I.H then, after the arrival desired depth junk bit and flexible shaft in guider by the vertical duction level.Moment of torsion and rotating speed that down-hole motor produces pass to junk bit through flexible shaft, and in addition, flexible shaft also plays the effect of transmitting the pressure of the drill, drive a pilot hole thereby on production casing, bore, and after casing milling finishes, trip out junk bit.
The 3rd step was sprayed the stratum; Nozzle and high-pressure injection flexible pipe are connected on the coiled tubing; G.I.H together then; By the vertical duction level, under the effect of " from tractive force " that nozzle produces, the coal seam is cut in the hydraulic energy erosion that utilizes the forward direction nozzle to produce simultaneously in the back in guider for arrival desired depth rear nozzle and high-pressure hose.The feed rate of the good high-pressure injection flexible pipe of Ground Control, treat that horizontal hole reaches predetermined length after, slowly reclaim the high-pressure injection flexible pipe, delivery nozzle is played in the hydraulic energy erosion coal seam reaming that utilizes the back to produce to nozzle, the reaming back that finishes.Adjustment can be carried out the operation of next branch well hole behind the azimuth.
There is a circular arc slideway said guider inside, can guarantee that jet hose transfers the approximate horizontal state to.Jet nozzle need guarantee it is the approximate horizontal state when getting into the stratum.
Fig. 3 shows the preferred embodiment of jet nozzle, and wherein, jet nozzle 15 comprises that the back is to nozzle 16 and forward direction nozzle 17.The drilling direction of nozzle 15 for figure shown in D to.Indication forward direction and back be to the nozzle drilling direction in this manual, for example in this preferred embodiment D to being forward direction.The back to nozzle 16 backward jet fluid produce the power (being otherwise known as) that nozzle 15 is promoted forward from tractive force.Forward direction nozzle 17 jet fluid is forward holed, and nozzle is produced the power that promotes backward.When the thrust forward that produces by nozzle ring 16 greater than the thrust backward that produces by forward direction nozzle 17 and flexible pipe 10 and nozzle 15 whole advance during the frictional resistance sum drilling effect of nozzle 15 realization self-propelled formulas.
This radial horizontal drilling technology can be carried out the operation of waterpower deep penetration jet in a plurality of coal seams of same peupendicular hole.A plurality of radially horizontal wells radially can laterally be crept in each layer position, can reach 16 branch horizontal wells at most, and each branch horizontal well length can reach 100～150 meters.This method directional effect is good, can link up natural hole and crack that coal seam reservoirs is grown effectively, thereby improve fracture condudtiviy, improves the permeability of coal seam reservoirs; In the coal seam, bore slotted hole, can increase the contact area of hole and coal seam reservoirs effectively, thereby will increase the pressure release area of coal seam reservoirs, enlarge the desorb scope of coal bed gas, improve the well yield of coal bed gas well and the recovery ratio of coal bed gas.
This method short construction period, cost is low, can radially creep into 8 branch horizontal wells in 2～3 days.
At last, the present invention must not be confined to the foregoing description and variant, and it can further be revised in the scope of the present invention that accompanying claims limits in every way.
The element tabulation
1 vehicular coild tubing unit
2 coiled tubings
3 coiled tubing guiding devices
4 well head blowout prevention boxes
5 hydraulic hand-pumps
6 oil pipe four-ways
7 oil pipes
8 centralizers
9 guiders
10 flexible hoses
11 down-hole motors
12 flexible shafts
13 junk bits
14 high-pressure injection flexible pipes
15 jet nozzles
16 forward direction nozzles
17 backs are to nozzle
Claims (11)
1. method of utilizing waterpower deep penetration radial level well development coal bed gas, this method are used for the well that casing cementing forms production casing, it is characterized in that this method comprises:
The first step: be lowered to guider (9) and location;
Second step: be lowered to junk bit (13), and on production casing, bore and drive pilot hole;
The 3rd step: be lowered to jet nozzle (15), jet nozzle (15) is through spraying the horizontal eyelet of formation to target coal seam self-propelled behind the pilot hole of sleeve pipe under the effect of high-pressure water jet.
2. method according to claim 1; It is characterized in that; The jet nozzle that is lowered in said the 3rd step comprises jet nozzle (15) and high-pressure injection flexible pipe is connected on the coiled tubing; G.I.H together then, arrive desired depth rear nozzle and high-pressure hose under the guider effect by the vertical duction level.
3. according to claim 1 or claim 2 method is characterized in that, said jet nozzle (15) comprises that forward direction nozzle and back are to nozzle.
4. method as claimed in claim 3; It is characterized in that; Self-propelled in said the 3rd step is sprayed and is comprised behind jet nozzle (15) target approach coal seam; Under the forward propulsion effect of the injection generation of nozzle, jet nozzle is advanced in the back along drilling direction, and the hydraulic energy erosion cutting coal seam that utilizes the forward direction nozzle to produce.
5. method as claimed in claim 4; It is characterized in that said the 3rd step also comprises treats that horizontal hole creeps into after length reaches design length, slowly reclaims the high-pressure injection flexible pipe; The hydraulic energy erosion coal seam reaming that utilizes the back to produce to nozzle, thus horizontal eyelet formed.
6. the method for claim 1, in the said first step be lowered to guider (9) and the location comprises: utilize oil pipe that guider is lowered to target coal seam, and by the magnetic orientator depthkeeping.
7. method as claimed in claim 6 also comprises by gyroscope and comes to be the guider orientation.
8. the method for claim 1, wherein the guider (9) that is lowered to of the first step comprises and utilizes workover rig that guider (9) is lowered into the target coal seam assigned address.
9. the method for claim 1; Wherein the first step can also be included in well head and install oil pipe four-way (6); And load onto well head blowout prevention box (4), well head blowout prevention box (4) directly is connected on tubing hanger top connection place, couples together with hydraulic line between hydraulic hand-pump (5) and the well head blowout prevention box (4).
10. the method for claim 1; The junk bit (13) that is lowered in wherein said second step comprises and connects down-hole motor (11), flexible shaft (12) and junk bit (13) on the ground that down-hole motor (11) is connected with coiled tubing (2) through flexible hose (10).
11. method as claimed in claim 10; Wherein the moment of torsion and the rotating speed of down-hole motor (11) generation pass to junk bit (13) through flexible shaft (12); Flexible shaft (12) also plays the effect of transmitting the pressure of the drill, thereby junk bit (13) gets out pilot hole on production casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100966314A CN102747999A (en) | 2011-04-18 | 2011-04-18 | Method for developing coal bed gas by deeply penetrating radial horizontal well by hydraulic power |
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| CN2011100966314A CN102747999A (en) | 2011-04-18 | 2011-04-18 | Method for developing coal bed gas by deeply penetrating radial horizontal well by hydraulic power |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334734A (en) * | 2013-06-09 | 2013-10-02 | 中国石油天然气股份有限公司 | Transformation method of interlayer in SAGD (Steam Assisted Gravity Drainage) well |
| CN103899349A (en) * | 2014-04-23 | 2014-07-02 | 重庆市能源投资集团科技有限责任公司 | Coal seam gas extraction method and extraction hole radial drilling guide device |
| CN103912257A (en) * | 2014-04-28 | 2014-07-09 | 中国石油集团渤海钻探工程有限公司 | Pressure dragging layering fracturing device |
| CN104234682A (en) * | 2014-07-14 | 2014-12-24 | 山西蓝焰煤层气集团有限责任公司 | Coiled tubing separate-layer fracturing method suitable for multiple thin coal seams |
| CN104863508A (en) * | 2015-04-30 | 2015-08-26 | 山西蓝焰煤层气集团有限责任公司 | Lower-pressure jetting reversed-drawing pore-forming technology in radial direction well construction |
| CN109281615A (en) * | 2018-11-19 | 2019-01-29 | 中国石油集团渤海钻探工程有限公司 | The radial hydraulic perforation tubing string of preset tool |
| CN110318673A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Radially horizontal well exploits shale oil method between salt |
| CN110735620A (en) * | 2018-07-18 | 2020-01-31 | 中国石油化工股份有限公司 | functional pipe columns for communicating reservoirs and method for communicating reservoirs |
| CN111663901A (en) * | 2019-03-06 | 2020-09-15 | 中国石油化工股份有限公司 | Flexible pipe jet drilling construction method |
| CN111946294A (en) * | 2019-05-15 | 2020-11-17 | 中国石油天然气股份有限公司 | Optical fiber guiding device |
| CN113217099A (en) * | 2021-06-08 | 2021-08-06 | 国能神东煤炭集团有限责任公司 | Hydraulic directional roof cutting device |
| CN113586025A (en) * | 2021-09-03 | 2021-11-02 | 陕西延长石油（集团）有限责任公司 | Compact reservoir horizontal well intermittent volume fracturing device and method |
| CN114991736A (en) * | 2022-06-30 | 2022-09-02 | 中煤科工集团西安研究院有限公司 | Directional grooving device and coal bed gas vertical well coal reservoir transformation method |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334734A (en) * | 2013-06-09 | 2013-10-02 | 中国石油天然气股份有限公司 | Transformation method of interlayer in SAGD (Steam Assisted Gravity Drainage) well |
| CN103899349A (en) * | 2014-04-23 | 2014-07-02 | 重庆市能源投资集团科技有限责任公司 | Coal seam gas extraction method and extraction hole radial drilling guide device |
| CN103912257A (en) * | 2014-04-28 | 2014-07-09 | 中国石油集团渤海钻探工程有限公司 | Pressure dragging layering fracturing device |
| CN103912257B (en) * | 2014-04-28 | 2016-04-06 | 中国石油集团渤海钻探工程有限公司 | A kind of dragging multiple fracturing device with pressure |
| CN104234682A (en) * | 2014-07-14 | 2014-12-24 | 山西蓝焰煤层气集团有限责任公司 | Coiled tubing separate-layer fracturing method suitable for multiple thin coal seams |
| CN104863508A (en) * | 2015-04-30 | 2015-08-26 | 山西蓝焰煤层气集团有限责任公司 | Lower-pressure jetting reversed-drawing pore-forming technology in radial direction well construction |
| CN104863508B (en) * | 2015-04-30 | 2017-06-27 | 山西蓝焰煤层气集团有限责任公司 | Radial direction well construction low-pressure fuel injection is pulled back pore-forming technique |
| CN110318673A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Radially horizontal well exploits shale oil method between salt |
| CN110735620A (en) * | 2018-07-18 | 2020-01-31 | 中国石油化工股份有限公司 | functional pipe columns for communicating reservoirs and method for communicating reservoirs |
| CN110735620B (en) * | 2018-07-18 | 2021-10-19 | 中国石油化工股份有限公司 | Functional pipe column for communicating reservoir and method for communicating reservoir |
| CN109281615A (en) * | 2018-11-19 | 2019-01-29 | 中国石油集团渤海钻探工程有限公司 | The radial hydraulic perforation tubing string of preset tool |
| CN111663901A (en) * | 2019-03-06 | 2020-09-15 | 中国石油化工股份有限公司 | Flexible pipe jet drilling construction method |
| CN111946294A (en) * | 2019-05-15 | 2020-11-17 | 中国石油天然气股份有限公司 | Optical fiber guiding device |
| CN113217099A (en) * | 2021-06-08 | 2021-08-06 | 国能神东煤炭集团有限责任公司 | Hydraulic directional roof cutting device |
| CN113217099B (en) * | 2021-06-08 | 2024-04-05 | 国能神东煤炭集团有限责任公司 | Hydraulic directional top plate cutting device |
| CN113586025A (en) * | 2021-09-03 | 2021-11-02 | 陕西延长石油（集团）有限责任公司 | Compact reservoir horizontal well intermittent volume fracturing device and method |
| CN113586025B (en) * | 2021-09-03 | 2023-03-14 | 陕西延长石油（集团）有限责任公司 | Compact reservoir horizontal well intermittent volume fracturing device and method |
| CN114991736A (en) * | 2022-06-30 | 2022-09-02 | 中煤科工集团西安研究院有限公司 | Directional grooving device and coal bed gas vertical well coal reservoir transformation method |
| CN114991736B (en) * | 2022-06-30 | 2024-04-16 | 中煤科工集团西安研究院有限公司 | Directional slotting device and coal bed methane vertical well coal reservoir reconstruction method |
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Application publication date: 20121024 |