CN102425371A - Compound cave making method of open hole of coalbed gas well - Google Patents
Compound cave making method of open hole of coalbed gas well Download PDFInfo
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- CN102425371A CN102425371A CN2011103402614A CN201110340261A CN102425371A CN 102425371 A CN102425371 A CN 102425371A CN 2011103402614 A CN2011103402614 A CN 2011103402614A CN 201110340261 A CN201110340261 A CN 201110340261A CN 102425371 A CN102425371 A CN 102425371A
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Abstract
The invention relates to a compound cave making method of an open hole of a coalbed gas well, which is mainly used for reaming operation or open hole cave making operation of an open hole well section of the coalbed gas well. Hydraulic jet is utilized for destroying a coalbed, thereby reducing the operating strength of a mechanical cave making tool; and then a mechanical tool is further utilized for finishing the coalbed at a cave making section, the size of a cave is expanded to the designed value, and the cave making is continuously performed through the mechanical tool on the basis of hydraulic jet cave making, thereby overcoming the defects and the insufficiencies caused by the single cave making method, meeting the demands of the reaming operation or the cave operation of the open hole well section of the coalbed gas well and achieving the purpose of high-efficient oil and gas production.
Description
Technical field
The present invention relates to the compound cave method of making of a kind of coal bed gas well bore hole; The ream operation or the bore hole that are mainly used in the coal bed gas well barefoot interval are made the cave operation; Satisfy the needs of bore hole cave completion,, belong to the exploitation method field of coal bed gas to realize the coal bed gas high-efficiency mining.
Background technology
At present, in the coal bed gas well exploitation at home and abroad, the bore hole cave of employing is made the cave technology and is mainly contained three kinds, and promptly negative pressure is made the cave, hydraulic jet makes the cave and machine tool is made the cave.Negative pressure is made the cave technology; General drilling well or the completion practice machine earth penetrating that adopts a special transformation of process; Several powerful air compressor machines and the compound pipe-line system of swivel head and ground through being equipped with are pressed into a large amount of air in the well, through sprain fast pressure and open flow repeatedly; Cause violent borehole pressure excited, make the stratum avalanche form the cave.It is to adopt the principle of hydraulic jet that hydraulic jet is made the cave technology, through connect the hydraulic jeting device of particular design in the drilling tool bottom, makes circulating fluid produce the effect of hydraulic jet blanking on the stratum, forms certain cave.It generally is the mechanical reaming hole mode that on principle, adopts that machine tool is made the cave technology, through certain control mode the knife bar of cave making tool is opened, and rotation under the drive of drilling tool, and the cutting stratum forms the cave of satisfying actual needs.From the above three kinds equipment and the complexity and the application results thereof of technology of making cave technology, negative pressure makes that technology required process equipment in cave is the most complicated, and technical requirements is high, and operation easier is big, and dangerous big, safety is difficult to assurance.Hydraulic jet makes the cave technical matters and equipment is comparatively simple, but use present hydraulic jet, is difficult to confirm the size in the cave that can produce, and normally hydraulic jet is made the cave that the cave technology produces and can not be satisfied the size requirements of oil-gas mining to the cave far away.Machine tool is made the cave technology, and technology and equipment are also fairly simple comparatively speaking, still, and for the hard payzone of coal bed gas well; Machine tool very easily is out of shape because of the pressure of the drill is excessive, and cave making tool can't propose, and perhaps the pressure of the drill does not reach requirement; Cause instrument to open, requirement can not fulfil assignment.
Summary of the invention
The objective of the invention is to propose the compound cave method of making of a kind of coal bed gas well bore hole, promptly utilize hydraulic jet to destroy the coal seam earlier, reduce the operation intensity of mechanical cave making tool; And then utilize machine tool to repair to making section coal seam, cave; And enlarge the cave size to design load; Make on the basis in cave at hydraulic jet exactly, proceed machine tool and make the cave, overcome defective and deficiency when use is single makes the cave method; Satisfy the ream operation of coal bed gas well barefoot interval or the demand of cave operation, reach the purpose of oil gas high-efficiency mining.
The present invention adopts following technical scheme, and the compound cave method of making of promptly a kind of coal bed gas well bore hole mainly comprises the steps:
The preparation of the first step, coal bed gas well bore hole section, cleaning and hydraulic jet tool detection
Confirm that coal seam bore hole section makes the depth location in cave; The method that adopts conventional coal seam to creep into drills the coal seam, sleeve pipe down to the coal seam section make the bore hole section top in cave; Utilize circulation that the landwaste and the ickings of coal seam well are cleaned out; Unimpeded no junk in the well, no landwaste shutoff and sand plug guarantee that cave making tool can reach the shaft bottom; Detect the hydraulic jet instrument, guarantee that each parts of liquid jet instrument connect firmly and the liquid jet instrument inner flow passage is unobstructed;
Going into the well of second step, hydraulic jet instrument
When the hydraulic jet instrument is gone into the well; BHA from top to bottom is: top drilling tool+meet the eye on every side centralizer+drill collar+meet the eye on every side centralizer+drill collar+hydraulic jet instrument; Connect the above-mentioned drilling tool of going into the well; Must guarantee to meet the eye on every side centralizer being equipped with, and guarantee that the hydraulic jet instrument can descend the coal seam bore hole to make the bottom of cave section near the sleeve pipe lower end position;
The 3rd step, hydraulic jet are made the cave
Drilling tool is delivered to the bottom that the coal seam bore hole is made the cave section with the hydraulic jet cave making tool, opens slush pump, and progressively increases discharge capacity; Begin slow rotation drilling tool then, the beginning hydraulic jet is made the cave, after the ickings that recycles is clean basically; On carry the about 100～500mm of drilling tool; Continue circulation, jet is made the cave, on final, carries the top that bore hole is made the cave section to the coal seam;
Tripping out of the 4th step, hydraulic jet instrument
Make the man-hour of spreading manuer in holes when accomplishing above-mentioned hydraulic jet, fully circulating fluid cleans well, termination of pumping then, and termination of pumping continued rotation drilling tool 3～5 minutes is carried drilling tool on slowly then, trips out the hydraulic jet cave making tool;
The 5th the step, confirm mechanical cave making tool, connect drilling tool
According to the situ of drilling well actual conditions; Select the size and the slush pump discharge capacity of the throttling arrangement nozzle of definite mechanical cave making tool; And according to the hardness that will make the stratum, cave and required cave diameter; Confirm to make the number of times in cave, each limiting component of mechanical cave making tool of adjustment and the length or the stroke of telescopic movable parts; The BHA that connects that from top to bottom adopts is: 1+mechanical cave making tool of top rod+drill collar;
The rig floor test of the 6th step, mechanical cave making tool
After machinery made connecting BHA and kelly bar being connected of cave, place on the rig floor face, must not be lowered to well head, open borehole pump, can the test machines cave making tool act freely; The machinery cave making tool can be controlled folding and unfolding, then carries out next step, otherwise, change the outfit again or adjust mechanical cave making tool and connect BHA, repeat a step or termination and make the cave process;
The 7th goes on foot, is lowered to mechanical cave making tool BHA
The cleaning well head is lowered to mechanical cave making tool BHA, forbids the turn on pump circulating mud in the going down process, when drilling tool down to the bottom in design cave;
The 8th step, machinery are made the cave
Slowly turn on pump is set up circulation, and slow rotation drilling tool, makes the cave operation, observes drilling tool moment of torsion tabular value; When moment of torsion increases suddenly, must adjust drilling tool rotating speed or slush pump discharge capacity immediately, with anti-tamper cave making tool knife bar mechanism, cause down-hole accident; When adjustment and definite suitable rotating speed and mud displacement, make when moment of torsion is stablized that this moment, torque value was the moment of torsion stationary value, when the drilling tool moment of torsion significantly reduces; And during lasting a period of time, carry drilling tool on slowly, when making moment of torsion be increased to, carry drilling tool on stopping and keeping this upper lifting force near the moment of torsion stationary value; Continue to make the worker that spreads manuer in holes, when observing the drilling tool moment of torsion once more and significantly descend, carry drilling tool on once more; Make the drilling tool moment of torsion near the moment of torsion stationary value, so repeatable operation is carried the height that distance reaches the cave of design on drilling tool;
The 9th step, trip out mechanical cave making tool, accomplish and to make the cave operation
When putting forward distance on the drilling tool and reach the height in cave of design, termination of pumping stops mud circulation, slow rotation drilling tool, and carry drilling tool slowly, and cave making tool knife bar mechanism is regained, trip out drilling tool and cave making tool, make the cave operation and accomplish.
The compound cave method of making of coal bed gas well bore hole of the present invention has comprised that the hydraulic jet instrument is made the cave, mechanical cave making tool is made two stages of cave; At first utilize the hydraulic jet technology to rely on high-pressure water jet to destroy the coal seam in the construction; Reduce the coal seam cementing strength, in weak seam, form irregular cave, utilize mechanical cave making tool to force to make the cave operation then making section coal seam, cave; Final cave, the coal seam diameter of realizing reaches two meters, is beneficial to the coal bed gas high-efficiency mining.This method has solved simple hydraulic jet and has made the cave, and the cave size is difficult to the difficult problem of satisfying the demand, and has also overcome single use major diameter machinery and has made the cave; The defective of very easily being out of shape in the cave making tool construction; Make the technological effective Application of composite in cave through hydraulic jet and mechanical type, it is simple to have realized that coal bed gas well is made the engineering preface of spreading manuer in holes, handling safety, reliable; And can control the cave size as required; Reduce the coal bed gas well bore hole and make the cave operating risk, improve the coal bed gas well bore hole and make cave efficient, satisfy the needs of coal bed gas wellbore construction and high-efficiency mining.
Description of drawings
Fig. 1 is a hydraulic jet cave making tool operation sketch map;
Among Fig. 1: payzone 15, hydraulic jet cave making tool 16.
Fig. 2 is mechanical cave making tool operation sketch map;
Among Fig. 2, top connection 1, main body 2, piston nozzle 3, piston 4, drilling fluid import and export 5, mandrel 6, knife bar pin 7, knife bar 8, mandrel nozzle 9, mandrel pin 10, connecting rod 11, carbide alloy 12, link pin 13, drill string 14, payzone 15.
The specific embodiment
Be example with D 152 main boreholes below, the compound cave method of making of coal bed gas well bore hole of the present invention further specified, mainly comprise the steps: in conjunction with accompanying drawing
The preparation of the first step, coal bed gas well bore hole section, cleaning and hydraulic jet tool detection
Confirm that coal seam bore hole section makes the depth location in cave, i.e. the top of cave section, position, the end; The method that adopts conventional coal seam to creep into drills the coal seam, sleeve pipe down to the coal seam section make the bore hole section top in cave; Utilize circulation that the landwaste and the ickings of coal seam well are cleaned out; Unimpeded no junk in the well, no landwaste shutoff and sand plug guarantee that cave making tool can reach the shaft bottom; Detect the hydraulic jet instrument, guarantee that each parts of liquid jet instrument connect firmly and the liquid jet instrument inner flow passage is unobstructed;
Going into the well of second step, hydraulic jet instrument
When the hydraulic jet instrument is gone into the well; BHA from top to bottom is: 1 of 1+D101.6 of centralizer drill collar of D89 drilling rod+meet the eye on every side+meet the eye on every side, 1+D145 of 1+D101.6 of centralizer drill collar hydraulic jet cave making tool; Guarantee meeting the eye on every side centralizer near the installation of sleeve pipe lower end position, and the assurance instrument can descend to make the bottom of cave section.
The 3rd step, hydraulic jet are made the cave
Drilling tool is delivered to the bottom that the coal seam bore hole is made the cave section with the hydraulic jet cave making tool, opens slush pump, and progressively increases discharge capacity; Begin slow rotation drilling tool then, the beginning hydraulic jet is made the cave, and is as shown in Figure 1; After the ickings that recycles is basic clean, on carry the about 100～500mm of drilling tool, continue circulation; Jet is made the cave, on final, carries the top that bore hole is made the cave section to the coal seam;
Tripping out of the 4th step, hydraulic jet instrument
Make the man-hour of spreading manuer in holes when accomplishing above-mentioned hydraulic jet, fully circulating fluid cleans well, termination of pumping then, and termination of pumping continued rotation drilling tool 3～5 minutes is carried drilling tool on slowly then, trips out the hydraulic jet cave making tool;
The 5th the step, confirm mechanical cave making tool, connect drilling tool
According to the situ of drilling well actual conditions; Select to confirm mechanical cave making tool; Present embodiment is selected D as shown in Figure 2 145 mechanical cave making tools for use, and according to the size and the slush pump discharge capacity that need to confirm the throttling arrangement nozzle, and according to the hardness that will make the stratum, cave and required cave diameter; Confirm to make the number of times in cave, each limiting component of mechanical cave making tool of adjustment and the length or the stroke of telescopic movable parts; The BHA that connects that from top to bottom adopts is: D89 drilling rod+1+D145 of D101.6 drill collar machinery cave making tool;
The rig floor test of the 6th step, mechanical cave making tool
After above-mentioned machinery made connecting BHA and kelly bar being connected of cave, place on the rig floor face, must not be lowered to well head, open borehole pump, can the test machines cave making tool act freely; The machinery cave making tool can be controlled folding and unfolding, then carries out next step, otherwise, change the outfit again or adjust mechanical cave making tool and connect BHA, repeat a step or termination and make the cave process;
The 7th goes on foot, is lowered to mechanical cave making tool BHA
The cleaning well head is lowered to mechanical cave making tool BHA, forbids the turn on pump circulating mud in the going down process, when drilling tool down to the bottom in design cave;
The 8th step, machinery are made the cave
Slowly turn on pump is set up circulation, and slow rotation drilling tool, makes the cave operation, observes drilling tool moment of torsion tabular value; When moment of torsion increases suddenly, must adjust drilling tool rotating speed or slush pump discharge capacity immediately, with anti-tamper cave making tool knife bar mechanism, cause down-hole accident; When adjustment and definite suitable rotating speed and mud displacement, make when moment of torsion is stablized that this moment, torque value was the moment of torsion stationary value, when the drilling tool moment of torsion significantly reduces; And during lasting a period of time, carry drilling tool on slowly, when making moment of torsion be increased to, carry drilling tool on stopping and keeping this upper lifting force near the moment of torsion stationary value; Continue to make the worker that spreads manuer in holes, when observing the drilling tool moment of torsion once more and significantly descend, carry drilling tool on once more; Make the drilling tool moment of torsion near the moment of torsion stationary value, so repeatable operation is carried the height that distance reaches the cave of design on drilling tool;
The 9th step, trip out mechanical cave making tool, accomplish and to make the cave operation
When putting forward distance on the drilling tool and reach the height in cave of design, termination of pumping stops mud circulation, slow rotation drilling tool, and carry drilling tool slowly, and cave making tool knife bar mechanism is regained, trip out drilling tool and cave making tool, make the cave operation and accomplish.
As a same reason; For other different well types; The construction parameter that type, model and the design of the instrument that just adopts confirmed is different, and the compound cave method step of making of the coal bed gas well bore hole of embodiment of the present invention is identical, thereby; Identical with step of the present invention and similar coal bed gas well bore hole is made the cave method, all belongs to the scope of the present invention's protection.
The compound cave method of making of coal bed gas well bore hole of the present invention is made the technological effective Application of composite in cave with hydraulic jet and mechanical type, can control the cave size as required, reduces and makes the cave operating risk, satisfies the needs of coal bed gas wellbore construction and high-efficiency mining.
Claims (1)
1. the compound cave method of making of coal bed gas well bore hole mainly comprises the steps:
The preparation of the first step, coal bed gas well bore hole section, cleaning and hydraulic jet tool detection
Confirm that coal seam bore hole section makes the depth location in cave, the method that adopts conventional coal seam to creep into drills the coal seam, sleeve pipe down to the coal seam section make the bore hole section top in cave; Utilize circulation that the landwaste and the ickings of coal seam well are cleaned out, unimpeded no junk in the well, no landwaste shutoff and sand plug guarantee that cave making tool can reach the shaft bottom; Detect the hydraulic jet instrument, guarantee that each parts of liquid jet instrument connect firmly and the liquid jet instrument inner flow passage is unobstructed;
Going into the well of second step, hydraulic jet instrument
When the hydraulic jet instrument is gone into the well; BHA from top to bottom is: top drilling tool+meet the eye on every side centralizer+drill collar+meet the eye on every side centralizer+drill collar+hydraulic jet instrument; Connect the above-mentioned drilling tool of going into the well; Must guarantee to meet the eye on every side centralizer being equipped with, and guarantee that the hydraulic jet instrument can descend the coal seam bore hole to make the bottom of cave section near the sleeve pipe lower end position;
The 3rd step, hydraulic jet are made the cave
Drilling tool is delivered to the bottom that the coal seam bore hole is made the cave section with the hydraulic jet cave making tool, opens slush pump, and progressively increases discharge capacity; Begin slow rotation drilling tool then, the beginning hydraulic jet is made the cave, after the ickings that recycles is clean basically; On carry the about 100mm～500mm of drilling tool; Continue circulation, jet is made the cave, on final, carries the top that bore hole is made the cave section to the coal seam;
Tripping out of the 4th step, hydraulic jet instrument
Make the man-hour of spreading manuer in holes when accomplishing above-mentioned hydraulic jet, fully circulating fluid cleans well, termination of pumping then, and termination of pumping continued rotation drilling tool 3 to 5 minutes is carried drilling tool on slowly then, trips out the hydraulic jet cave making tool;
The 5th the step, confirm mechanical cave making tool, connect drilling tool
According to the situ of drilling well actual conditions; Select the size and the slush pump discharge capacity of the throttling arrangement nozzle of definite mechanical cave making tool; And according to the hardness that will make the stratum, cave and required cave diameter; Confirm to make the number of times in cave, each limiting component of mechanical cave making tool of adjustment and the length or the stroke of telescopic movable parts; The BHA that connects that from top to bottom adopts is: 1+mechanical cave making tool of top rod+drill collar;
The rig floor test of the 6th step, mechanical cave making tool
After machinery made connecting BHA and kelly bar being connected of cave, place on the rig floor face, must not be lowered to well head, open borehole pump, can the test machines cave making tool act freely; The machinery cave making tool can be controlled folding and unfolding, then carries out next step, otherwise, change the outfit again or adjust mechanical cave making tool and connect BHA, repeat a step or termination and make the cave process;
The 7th goes on foot, is lowered to mechanical cave making tool BHA
The cleaning well head is lowered to mechanical cave making tool BHA, forbids the turn on pump circulating mud in the going down process, when drilling tool down to the bottom in design cave;
The 8th step, machinery are made the cave
Slowly turn on pump is set up circulation, and slow rotation drilling tool, makes the cave operation, observes drilling tool moment of torsion tabular value; When moment of torsion increases suddenly, must adjust drilling tool rotating speed or slush pump discharge capacity immediately, with anti-tamper cave making tool knife bar mechanism, cause down-hole accident; When adjustment and definite suitable rotating speed and mud displacement, make when moment of torsion is stablized that this moment, torque value was the moment of torsion stationary value, when the drilling tool moment of torsion significantly reduces; And during lasting a period of time, carry drilling tool on slowly, when making moment of torsion be increased to, carry drilling tool on stopping and keeping this upper lifting force near the moment of torsion stationary value; Continue to make the worker that spreads manuer in holes, when observing the drilling tool moment of torsion once more and significantly descend, carry drilling tool on once more; Make the drilling tool moment of torsion near the moment of torsion stationary value, so repeatable operation is carried the cave height that distance reaches design on drilling tool;
The 9th step, trip out mechanical cave making tool, accomplish and to make the cave operation
When putting forward distance on the drilling tool and reach the cave height of design, termination of pumping stops mud circulation, slow rotation drilling tool, and carry drilling tool slowly, and cave making tool knife bar mechanism is regained, trip out drilling tool and cave making tool, make the cave operation and accomplish.
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| CN2011103402614A CN102425371A (en) | 2011-11-02 | 2011-11-02 | Compound cave making method of open hole of coalbed gas well |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278952A (en) * | 2014-03-14 | 2015-01-14 | 中国石油大学(华东) | Hydraulic-mechanical combined coal seam cave forming device and use method |
| CN105756591A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed methane well completion method |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107762408A (en) * | 2016-08-22 | 2018-03-06 | 中国石油天然气股份有限公司 | A kind of coal bed gas directional well makes cave method |
| CN109083637A (en) * | 2018-08-28 | 2018-12-25 | 中国矿业大学 | A kind of down-hole coal bed hydraulic flushing in hole makes cavities calipers and method |
| CN111810087A (en) * | 2020-06-12 | 2020-10-23 | 煤科集团沈阳研究院有限公司 | Hydraulic large-diameter grading cave-making pressure-relief permeability-increasing device and method |
| CN112832765A (en) * | 2021-03-23 | 2021-05-25 | 中国矿业大学 | Shear fork telescopic ground drilling water jet coal mining nozzle device and using method |
| CN113863897A (en) * | 2020-06-12 | 2021-12-31 | 中国石油天然气股份有限公司 | Cave well completion method and system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278952A (en) * | 2014-03-14 | 2015-01-14 | 中国石油大学(华东) | Hydraulic-mechanical combined coal seam cave forming device and use method |
| CN105756591A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed methane well completion method |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107476783B (en) * | 2016-06-08 | 2019-09-06 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107762408A (en) * | 2016-08-22 | 2018-03-06 | 中国石油天然气股份有限公司 | A kind of coal bed gas directional well makes cave method |
| CN109083637A (en) * | 2018-08-28 | 2018-12-25 | 中国矿业大学 | A kind of down-hole coal bed hydraulic flushing in hole makes cavities calipers and method |
| CN109083637B (en) * | 2018-08-28 | 2021-07-23 | 中国矿业大学 | Device and method for measuring hole diameter of underground coal seam hydraulic punching hole making |
| CN111810087A (en) * | 2020-06-12 | 2020-10-23 | 煤科集团沈阳研究院有限公司 | Hydraulic large-diameter grading cave-making pressure-relief permeability-increasing device and method |
| CN113863897A (en) * | 2020-06-12 | 2021-12-31 | 中国石油天然气股份有限公司 | Cave well completion method and system |
| CN111810087B (en) * | 2020-06-12 | 2022-11-08 | 中煤科工集团沈阳研究院有限公司 | Hydraulic large-diameter grading, cave-making, pressure-releasing and permeability-increasing device and method |
| CN112832765A (en) * | 2021-03-23 | 2021-05-25 | 中国矿业大学 | Shear fork telescopic ground drilling water jet coal mining nozzle device and using method |
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Application publication date: 20120425 |