CN106869895A - A kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction - Google Patents
A kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction Download PDFInfo
- Publication number
- CN106869895A CN106869895A CN201710222833.6A CN201710222833A CN106869895A CN 106869895 A CN106869895 A CN 106869895A CN 201710222833 A CN201710222833 A CN 201710222833A CN 106869895 A CN106869895 A CN 106869895A
- Authority
- CN
- China
- Prior art keywords
- coal petrography
- hydraulic fracturing
- cement
- sleeve pipe
- cement sheath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 45
- 239000004568 cement Substances 0.000 title claims abstract description 26
- 230000006378 damage Effects 0.000 title claims abstract description 8
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000012188 paraffin wax Substances 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000011083 cement mortar Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 239000003818 cinder Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000011259 mixed solution Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 7
- 125000003003 spiro group Chemical group 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010021036 Hyponatraemia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction.Rock sample is made in specific mould, the rock sample made has identical mechanical property with coal petrography, and drilling well is simulated in rock sample.In order to increase sleeve pipe cementing strength, screw thread is processed in its vicinity, top increases sealing ring.During preforation tunnel is connected, using the cylindric paraffin of Mold Making suitable dimension, preforation tunnel is blocked before setting of casing, injection cementing concrete, cement is put into 65 70 DEG C of insulating boxs after solidifying completely, and paraffin takes out rock sample after being completely dissolved, to adding ethanol solution in sleeve pipe, paraffin pours out mixed solution after being completely dissolved, and is that follow-up fracturing experiments are prepared.
Description
Technical field
It is a kind of thing molding of cement sheath destruction in indoor coal petrography hydraulic fracturing the present invention relates to hydraulic fracturing technology field
Make method.
Background technology
Coal is the main body of China's energy, coal industry health, stabilization, constantly development be to be related to national energy security
Significant problem.At this stage, the primary goal of China's coal-mine gas pumping is to ensure Safety of Coal Mine Production, while taking into account coal bed gas
Development and utilization.For low air permeability coal seam, when taking out coal-bed gas in advance using conventional bore arrangement mode and parameter,
Required gas drainage results are not often reached.Ground hydraulic fracturing technology is widely used in cbm development.Bored by ground
Fracturing fluid is injected in hole to coal seam, when pressure break hydraulic coupling is more than coal seam above rock pressure, substantial amounts of closure crack quilt in coal seam
Press off and constantly extend, extend, coal bed gas flow channel is greatly increased, and gas permeability of coal seam is significantly improved.Therefore coal is actively developed
Layer hydraulic fracturing technology research is extremely important.
During coal bed gas well fracturing yield increasing, part CBM Fracturing well occurs in that to produce dilutional hyponatremia, aerogenesis not enough
Phenomenon so that methane output does not reach requirement.Reason is that cementing concrete ring has suffered to damage in fracturing process, has linked up water
Layer.Due to lacking to underground cement sheath situation epistemic means, it is necessary to carry out crushing test to coal bed gas well cementing concrete ring and grind
Study carefully, on condition that making the simulation rock sample of laboratory crushing test, set up the physical model of cement sheath destruction, be coal petrography hydraulic fracturing
Lay the foundation.
The content of the invention：
The technical problems to be solved by the invention are directed to the deficiencies in the prior art, there is provided a kind of indoor coal petrography hydraulic fracturing
The thing mould preparation method of cement sheath destruction.
Technical scheme is as follows：
The hydraulic fracturing of coal petrography in laboratory, first by coal cinder cutting process, makes it into regular shape and suitable size,
Then the cement mortar of simulation coal sample is prepared, makes cement mortar that there is similar mechanical property to coal sample.Cement mortar is poured into specifically
In mould.It is required that first coal sample is put into mould, the cement mortar for preparing is subsequently poured into.Rock sample is moved in experiment for convenience,
Two long spiro nails need to be put into rock sample.Simulation drilling well, at rock sample center, core bit gets out the well of suitable dimension, gets out
Well must have certain similitude with field condition, using the method for geometric similarity, with live borehole size and room
It is worth on the basis of the ratio of interior coal petrography borehole size, indoor coal petrography cement sheath thickness is worth to divided by benchmark using live cement thickness
Degree.Processing sleeve pipe, one section of closing of sleeve pipe, as the bottom of sleeve pipe, according to different perforating site and pattern, in lathe
On get out eyelet.Because the cementing strength between sleeve pipe and cementing concrete is poor, to avoid fracturing fluid from being altered along the first cement plane and
Cement sheath is destroyed, the screw thread of certain depth and spacing is processed on sleeve pipe, increase the contact area of cementing concrete and sleeve pipe,
So as to increase the cementing strength of the first cement plane.In addition, during pressure break builds the pressure, fracturing fluid is easily altered along the first cement plane
To well head, to solve the problem, O-ring seal is added in distance sleeve upper end, prevent fracturing fluid from flowing out.In order to simulated field is penetrated
The effect of reservoir is linked up in hole, is made and the preforation tunnel cylindric paraffin of diameter identical, and eyelet is blocked with the paraffin rod made,
Sleeve pipe is put into well and is cemented the well, heating in high-temperature cabinet is put into after solidification, wait paraffin melting rear addition ethanol solution dissolving paraffin,
Hot water cannula cleaning is added, pressure break is waited after drying.
The beneficial effects of the invention are as follows：By preparing the integument that there is identical mechanical property with coal petrography, pressure break is eliminated
During due to the different interference produced to experiment of material.Screw thread and sealing ring are increased on sleeve pipe, increases sleeve pipe and cement sheath
Cementing strength, cement sheath is rushed out well in preventing experimentation.Sleeve pipe and cement are connected using the paraffin rod that stays is put in advance
Ring, waits cementing concrete to dissolve paraffin rod after solidifying, and the fracturing fluid of formation rule enters the passage of coal petrography.
Brief description of the drawings：
Fig. 1 is rock sample structural representation of the present invention.
In figure：1-sleeve pipe；2-long spiro nail；3-simulation coal petrography；4-sealing ring；5-cement sheath；6-coal cinder；7-spiral shell
Line；8-perforation tunnel.
Specific embodiment：
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Coal cinder 6 is cut into 240mm × 240mm × 240mm sizes, is put into the mould of 300mm × 300mm × 300mm,
Then the cement mortar of simulation rock sample is prepared, makes cement mortar that there is similar mechanical property to rock sample, cement mortar is poured into mould
Make simulation coal petrography 3.Rock sample is moved for convenience, long spiro nail 2 need to be added in rock sample, it is ensured that the closest mold side of long spiro nail
The distance of frame is 50mm, is higher by the distance of die tip for 50mm, after cement is poured, will enter what is be in a liquid state under long spiro nail
In cement mortar, and the part screw that will be exposed with clear water is cleaned up, and is that follow-up work is laid a solid foundation.Simulation drilling well, according to
Geometric similarity gets out the well that depth is 250mm, cement sheath with the core bit of 25mm than the ratio for 8.2 at rock sample center
Thickness is 4.5mm.Choose length 300mm, external diameter 16mm, the steel pipe of thickness 1mm, one section of closing of steel pipe, as the bottom of sleeve pipe 1
End, in distance sleeve bottom, the distance of 100mm gets out 4 eyelets of diameter 2mm, eyelet is evenly distributed in eyelet surrounding,
4 eyelets of 2mm 8 are being got out at ground floor eyelet 20mm, eyelet is differed 45 ° with ground floor eyelet.In order to increase by
The cementing strength at one interface, processed above the second layer eyelet 20mm depth 0.2mm, width 0.3mm, pitch 3mm,
Length is the screw thread 7 of 60mm, and seal 4 is encrypted at 20mm above screw thread.Paraffin is processed in diameter 2mm, the mould of 5.5mm high
Rod, paraffin, in 47 DEG C of -64 DEG C of fusings, is in solid-state under normal temperature, is first poured into liquid paraffin in the mould of certain specification, treats paraffin
Taken out after solidification.Fluid sealant is smeared into ready-made paraffin rod one end, is put into preforation tunnel, the set of the analogue perforation that will be made
Pipe is slowly put into the middle of well, prevents paraffin rod from encountering coal petrography and being broken, and well is poured into a mould with the cementing slurry for preparing, and is coagulated
Paraffin is completely dissolved Gu being placed on 65 DEG C of insulating box after 12 hours, the rock sample after heating is taken out, added in sleeve pipe immediately
Appropriate ethanol, being sufficiently stirred for ethanol solution is completely dissolved paraffin, and mixing liquid is poured out, and adds 65 DEG C of hot water cleaning sets
Pipe, pressure break is waited after drying.
Claims (4)
1. a kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction, mainly includes：The making of coal petrography, sleeve pipe
Making is connected with perforation tunnel, it is characterised in that：Coal cinder is placed in the middle of mould, is had with prepare and coal petrography in a mold
The cement mortar for having similar mechanical property wraps up coal petrography.
2. the thing mould preparation method that a kind of indoor coal petrography hydraulic fracturing cement sheath according to claim 1 is destroyed, its feature
It is：In order to increase the cementing strength of sleeve pipe and cementing concrete, its vicinity increased screw thread, and top increased sealing ring, prevent
Only altered on fracturing fluid.
3. the thing mould preparation method that a kind of indoor coal petrography hydraulic fracturing cement sheath according to claim 1 is destroyed, its feature
It is：Preforation tunnel is blocked in advance with solid paraffin rod, after completing well cementation, rock sample is heated, ethanol is molten to being added in sleeve pipe
Liquid dissolves paraffin, the preforation tunnel of formation rule, it is ensured that fracturing fluid is applied directly in coal petrography.
4. the thing mould preparation method that a kind of indoor coal petrography hydraulic fracturing cement sheath according to claim 1 is destroyed, its feature
It is：Using the method for geometric similarity, it is worth on the basis of ratio of the live borehole size with indoor coal petrography borehole size, is utilized
Live cement thickness is worth to indoor coal petrography cement thickness divided by benchmark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710222833.6A CN106869895A (en) | 2017-04-07 | 2017-04-07 | A kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710222833.6A CN106869895A (en) | 2017-04-07 | 2017-04-07 | A kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106869895A true CN106869895A (en) | 2017-06-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710222833.6A Pending CN106869895A (en) | 2017-04-07 | 2017-04-07 | A kind of thing mould preparation method of indoor coal petrography hydraulic fracturing cement sheath destruction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106869895A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825209A (en) * | 2018-06-20 | 2018-11-16 | 东北石油大学 | A kind of research oil-well cement ring alters the device and method of slot closure rule |
| CN110242267A (en) * | 2019-05-17 | 2019-09-17 | 山东科技大学 | For simulating the hydraulic fracturing shearing test system and method for geothermal system hot dry rock |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2121062C1 (en) * | 1997-04-15 | 1998-10-27 | Московский государственный горный университет | Method of withdrawal of methane from coal bed |
| CN103883302A (en) * | 2014-03-31 | 2014-06-25 | 中国矿业大学 | Method for manufacturing physical simulation test parts of coal-bed gas well hydraulic fractures |
| CN105334090A (en) * | 2015-11-02 | 2016-02-17 | 中国石油大学(北京) | Manufacturing method of coal-bearing production layer set fracturing physical modeling samples |
| WO2016074510A1 (en) * | 2014-11-11 | 2016-05-19 | 中国矿业大学 | Method for determining earth surface interpenetrated crack distribution and air leakage characteristics in shallow burial coal mining |
| CN105626027A (en) * | 2015-12-23 | 2016-06-01 | 中国石油大学(北京) | Coal and rock directional well sand fracturing physical simulation method |
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2017
- 2017-04-07 CN CN201710222833.6A patent/CN106869895A/en active Pending
Patent Citations (5)
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| RU2121062C1 (en) * | 1997-04-15 | 1998-10-27 | Московский государственный горный университет | Method of withdrawal of methane from coal bed |
| CN103883302A (en) * | 2014-03-31 | 2014-06-25 | 中国矿业大学 | Method for manufacturing physical simulation test parts of coal-bed gas well hydraulic fractures |
| WO2016074510A1 (en) * | 2014-11-11 | 2016-05-19 | 中国矿业大学 | Method for determining earth surface interpenetrated crack distribution and air leakage characteristics in shallow burial coal mining |
| CN105334090A (en) * | 2015-11-02 | 2016-02-17 | 中国石油大学(北京) | Manufacturing method of coal-bearing production layer set fracturing physical modeling samples |
| CN105626027A (en) * | 2015-12-23 | 2016-06-01 | 中国石油大学(北京) | Coal and rock directional well sand fracturing physical simulation method |
Non-Patent Citations (4)
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| 屠世浩主编: "《岩层控制的实验方法与实测技术》", 31 July 2010, 徐州：中国矿业大学出版社 * |
| 树脂锚杆及锚固剂: "《树脂锚杆及锚固剂》", 30 April 1983, 北京：煤炭工业出版社 * |
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| 美国焊接学会编: "《热喷涂原理与应用技术》", 31 July 1988, 成都：四川科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825209A (en) * | 2018-06-20 | 2018-11-16 | 东北石油大学 | A kind of research oil-well cement ring alters the device and method of slot closure rule |
| CN110242267A (en) * | 2019-05-17 | 2019-09-17 | 山东科技大学 | For simulating the hydraulic fracturing shearing test system and method for geothermal system hot dry rock |
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Application publication date: 20170620 |