CN107762451A - Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming - Google Patents
Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming Download PDFInfo
- Publication number
- CN107762451A CN107762451A CN201710989536.4A CN201710989536A CN107762451A CN 107762451 A CN107762451 A CN 107762451A CN 201710989536 A CN201710989536 A CN 201710989536A CN 107762451 A CN107762451 A CN 107762451A
- Authority
- CN
- China
- Prior art keywords
- well
- reaming
- screen casing
- pressure
- payzone
- 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 65
- 238000000034 method Methods 0.000 title claims abstract description 23
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 238000009987 spinning Methods 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 6
- 239000003818 cinder Substances 0.000 claims description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000012224 working solution Substances 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
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of coal bed gas horizontal well payzone underbalance reaming to transform well completion method, including：Horizontal well drilling：Horizontal well drilling；Lower large aperture screen casing；Coal bed gas payzone underbalance reaming rebuilding construction：It is lower bore, for drilling fluid, closing well build the pressure, pressure release；Water jet reaming is rinsed and takes rock operation.The present invention can expand coal seam section hole diameter, increase the bare area of payzone, eliminate the pollution that coal seam is subject in well operations are drilled；It can make the coal seam beyond cave that extension fracture and shear fracture occur, form a Shear crushed zone, strengthen coal seam flow conductivity.
Description
Technical field
The present invention relates to cbm development production technique field, more particularly to a kind of coal bed gas horizontal well payzone underbalance expands
Transform well completion method in hole.
Background technology
In CBM exploration and development, it is frequently run onto because coal seam permeability is low, causes gas production low, or even hold one's breath
Situation, being smoothed out for work of exploration and development is had a strong impact on.How to improve well yield and long term stable production is opened as coal bed gas
The key of hair.According to investigation, Cavity Completion Well Methods achieve good application effect in straight well, and indivedual wells even realize height
Production, stable yields.For example, have a bite coal bed gas straight well make cave before borehole diameter be 215.9mm, not aerogenesis；After making cave, cave diameter reaches
To 2m, gas production 1800m3/d.Cavity Completion Well Methods mainly have the advantages of two aspects, first, the exposed surface in increase coal seam
Product；Second, destroying the coal seam by mud contamination, the flow channels of coal bed gas are improved, so as to improve well yield.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of coal bed gas horizontal well payzone underbalance reaming to be transformed into well
Method, increase horizontal well uncovering coal plane product and flow conductivity, improve the production capacity of coal bed gas horizontal well, increase coal bed gas production
Tolerance.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of coal bed gas horizontal well payzone owes flat
Weigh reaming transformation well completion method, comprises the following steps：
(1) horizontal well drilling：Horizontal well drilling, the horizontal segment of horizontal well is located in coal seam, pay attention in drilling process anti-collapse, anti-
Leakage；
(2) large aperture screen casing under：Horizontal segment tripping in large aperture screen casing in coal seam；
(3) coal bed gas payzone underbalance reaming rebuilding construction：
1) bored under：Suitable Flushing tubular column is selected to combine and lower brill, smooth operation operates in going down process, forbids putting suddenly
Put；
2) drilling fluid is replaced：Under get into casing shoe position after, open nitrogen injection or air device, the drilling fluid in well replaced
Go out；
3) closing well builds the pressure：Half envelope flashboard is closed, choke manifold is closed, builds the pressure, continues, toward injection gas in well, to treat that pressure reaches pre-
After definite value, stop gas injection；
4) pressure release：Choke manifold valve release is opened, release is rapid, ensures that the change of well cylinder pressure is fast, reaches fluctuation
Purpose, the pressure release that builds the pressure repeatedly afterwards are multiple；
(4) water jet reaming is rinsed and takes rock operation：By pressure, the release of repeatedly spraining, after completing underbalance reaming transformation, turn on pump
After being pumped into clear water, coal seam is rinsed using inflated with nitrogen+spinning water jet reaming tool and carries out water jet ream operation, and by screen casing
Interior landwaste carries out pit shaft.
Step (2) large aperture screen casing is needed on the premise of meeting to support wall strength, by the coal cinder of large volume
While gear is outside screen casing, the ickings of fritter can enter screen casing, and fritter ickings is returned to well head with taking rock operation in screen casing,
And when spinning water jet reaming tool is in screen casing internal rotation jet operation, drilling fluid can pass through screen casing, rinse outside screen casing
The coal seam in portion, realize water jet ream operation.
The beneficial effects of the invention are as follows：Coal seam section hole diameter can be expanded, increase the bare area of payzone, coal seam is eliminated and boring
The pollution being subject in completion practice；It can make the coal seam beyond cave that extension fracture and shear fracture occur, form a shearing
Crushed zone, strengthen coal seam flow conductivity.
Brief description of the drawings
Fig. 1 is that well completion method effect diagram is transformed in coal bed gas horizontal well payzone underbalance reaming of the present invention.
In figure：1- protective casings；2- large apertures screen casing；3- crushes coal cinder；4- coal seams.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
As shown in figure 1, the coal bed gas horizontal well payzone underbalance reaming transformation well completion method of the present invention, including following step
Suddenly：
(1) horizontal well drilling：Horizontal well drilling, the horizontal segment of horizontal well is located in coal seam 4, pay attention in drilling process it is anti-collapse,
Leakproof；
(2) large aperture screen casing under：Horizontal segment tripping in large aperture screen casing 2 in coal seam；
(3) coal bed gas payzone underbalance reaming rebuilding construction：
1) bored under：Suitable Flushing tubular column is selected to combine and lower brill, smooth operation operates in going down process, forbids putting suddenly
Put；
2) drilling fluid is replaced：Under get into casing shoe position after, open nitrogen injection or air device, the drilling fluid in well replaced
Go out；
3) closing well builds the pressure：Half envelope flashboard is closed, choke manifold is closed, builds the pressure, continues, toward injection gas in well, to treat that pressure reaches pre-
After definite value, stop gas injection；
4) pressure release：Choke manifold valve release is opened, release is rapid, ensures that the change of well cylinder pressure is fast, reaches fluctuation
Purpose, the pressure release that builds the pressure repeatedly afterwards are multiple；
(4) water jet reaming is rinsed and takes rock operation：By pressure, the release of repeatedly spraining, after completing underbalance reaming transformation, turn on pump
After being pumped into clear water, coal is rinsed using inflated with nitrogen+spinning water jet reaming tool (see Chinese patent CN201520366902.7)
Layer carries out water jet ream operation, and the landwaste in screen casing is carried out into pit shaft.
Step (2) large aperture screen casing is needed on the premise of meeting to support wall strength, by the coal cinder of large volume
While gear is outside screen casing, the ickings of fritter can enter screen casing, and fritter ickings is returned to well head with taking rock operation in screen casing,
And when spinning water jet reaming tool is in screen casing internal rotation jet operation, drilling fluid can pass through screen casing, rinse outside screen casing
The coal seam in portion, realize water jet ream operation.
1 is protective casing；3 be broken coal cinder.
With reference to specific embodiment, so that flatly three drive a well as an example, to the coal bed gas horizontal well payzone underbalance of the present invention
Reaming is transformed into well technology and is explained, and mainly includes the following steps that：
1st, horizontal well drilling：In high-order coal coal bed gas block, a bite horizontal well is bored.So that three drive a well as an example, one opens and uses φ
311.2mm drill bits, lower φ 244.5mm sleeve pipes, cementing concrete return to ground；Two open with φ 215.9mm drill bits, lower φ 177.8mm
Sleeve pipe, cementing concrete return to well head；Three open and are drilled into finishing drilling well depth finishing drilling with φ 152.4mm drill bits, wherein three spud sections should be complete
It is in horizontal segment entirely.
2nd, lower large aperture screen casing：Under special large aperture screen casing, to three spud section coal seam positions, pipe string will be sent into and be combined as：
It is sent into drilling tool+full-bore support pipe hanger+large aperture screen casing+guide shoe.Enter the combination of well casing string strictly by completion arrangement and method for construction system
Fixed pipe string combination is attached and installed is not more than 15m/min into well, running speed, by being linked closely on standard torque.
3rd, coal bed gas payzone underbalance reaming rebuilding construction：
1) bored under：According to designed well-flushing BHA Arrangement pipe string, start lower brill.Smooth operation in going down process,
Forbid putting suddenly and put.Well-flushing BHA is as follows：Water jet instrument+φ 88.9mm drilling tools are to well head.
2) drilling fluid is replaced：After casing shoe position is got under well-flushing BHA, note gas apparatus is opened, with gas by well
Drilling fluid replaces out.
3) closing well builds the pressure：Half envelope flashboard is closed, closes choke manifold, gas is injected into well and is built the pressure.When pressure be applied to it is predetermined
After value, stop gas injection, observe pressure condition, until gas pressure is stable in pit shaft.
4) bleed off pressure：Build the pressure after a period of time, open choke manifold valve and bleed off pressure.Bleed off pressure rapid, guarantee well cylinder pressure
Quick change, reach the purpose of pressure oscillation.It is repeated multiple times afterwards to be built the pressure, bleed off pressure operation.
4th, water jet reaming is rinsed and takes rock operation：By pressure of repeatedly spraining, operation is bled off pressure, is filled the coal seam on screen casing periphery
After the negative pressure divided makes cave, turn on pump is pumped into clear water, is rinsed using inflatable body+spinning hydraulic jet reaming tool outside the screen casing of large aperture
Coal seam and shaft bottom landwaste is carried out.Water jet reaming construction operation process is as follows：
1) tripping in water jet ream operation instrument, BHA are：Spinning water jet reaming tool+drilling rod；
2) top-down mode is taken to carry out water jet ream operation.When water jet instrument is transferred to the screen casing of large aperture
During portion, turn on pump proceeds by water jet and makes cave operation；
3) using a cylindrical drill bar as a working stage during water jet ream operation, the control decentralization speed within this stage
8m/min is spent, transfers to slow put-on and delegated behind bottom, is repeated 3-5 times, about 15min/ posts, mud pumpage 10-20l/s；
4) aforesaid operations are repeated., can basis when causing to transfer slow because ickings is too many in the support tube of large aperture
Actual conditions automatically adjust running speed；
5) when water jet instrument transfers to large aperture support bottom of the tube, jet wash is made cave operation and completed；
6) decided whether to repeat water jet ream operation according to actual conditions, made when needing to repeat hydraulic reaming
During industry, then repeat 3-4 steps, until reaming operation.
7) after reaming, replace into clear water, pull out of hole.Trip-out finishes dress gas production wellhead.
Present invention is specifically directed to high-order coal coal seam feature, to explore horizontal well payzone renovation technique, increase horizontal well coal seam
Bare area and flow conductivity, the technology for improving the production capacity of coal bed gas horizontal well and studying.For coal seam in recent years
The problems such as gas production is low, yield is unstable be present in gas exploration exploitation, use for reference the technical characterstic of well caving completion volume increase, it is proposed that
The horizontal segment of coal bed gas horizontal well carries out reaming hole and makes cave technical scheme, intends complete in the support tube of coal seam horizontal segment tripping in large aperture
Afterwards, tripping in gas makes cave and jet reaming tubing string, and producing pressure oscillation in shaft bottom using gas makes coal seam collapse, and carries out making cave work
Industry；Drilling fluid produces the coal seam outside water jet flushing support tube by jet pipe nipple simultaneously, by the coal ash inside and outside support tube, ickings
Wash out.During cave is made in reaming, wellbore pressure is consistently less than payzone pressure, avoids injury of the working solution to payzone.
In summary, present disclosure is not limited in the above embodiments, and the knowledgeable people in same area can
Can propose other embodiments easily within the technological guidance's thought of the present invention, but this embodiment is included in this hair
Within the scope of bright.
Claims (2)
1. well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming, it is characterised in that is comprised the following steps：
(1) horizontal well drilling：Horizontal well drilling, the horizontal segment of horizontal well is located in coal seam, anti-collapse, leakproof is paid attention in drilling process；
(2) large aperture screen casing under：Horizontal segment tripping in large aperture screen casing in coal seam；
(3) coal bed gas payzone underbalance reaming rebuilding construction：
1) bored under：Suitable Flushing tubular column is selected to combine and lower brill, smooth operation operates in going down process, forbids putting suddenly and puts；
2) drilling fluid is replaced：Under get into casing shoe position after, open nitrogen injection or air device, the drilling fluid in well replaced out；
3) closing well builds the pressure：Half envelope flashboard is closed, choke manifold is closed, builds the pressure, continues, toward injection gas in well, to treat that pressure reaches predetermined value
Afterwards, gas injection is stopped；
4) pressure release：Choke manifold valve release is opened, release is rapid, ensures that the change of well cylinder pressure is fast, reaches fluctuation purpose,
The pressure release that builds the pressure repeatedly afterwards is multiple；
(4) water jet reaming is rinsed and takes rock operation：By pressure, the release of repeatedly spraining, after completing underbalance reaming transformation, turn on pump is pumped into
After clear water, coal seam is rinsed using inflated with nitrogen+spinning water jet reaming tool and carries out water jet ream operation, and by screen casing
Landwaste carries out pit shaft.
2. coal bed gas horizontal well payzone underbalance reaming transformation well completion method according to claim 1, it is characterised in that described
Step (2) large aperture screen casing needs on the premise of meeting to support wall strength, to keep off outside screen casing by the coal cinder of large volume
While, the ickings of fritter can enter screen casing, and fritter ickings is returned to well head with taking rock operation in screen casing, and in spinning water
For jet reaming tool in screen casing internal rotation jet operation, drilling fluid can pass through screen casing, the coal seam rinsed outside screen casing, realize
Water jet ream operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710989536.4A CN107762451A (en) | 2017-10-19 | 2017-10-19 | Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710989536.4A CN107762451A (en) | 2017-10-19 | 2017-10-19 | Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107762451A true CN107762451A (en) | 2018-03-06 |
Family
ID=61268690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710989536.4A Pending CN107762451A (en) | 2017-10-19 | 2017-10-19 | Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107762451A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173240A (en) * | 2019-06-19 | 2019-08-27 | 陕西浩兴坤达新能源科技有限公司 | A kind of coal mine gas drainage method |
| CN110306961A (en) * | 2019-06-19 | 2019-10-08 | 陕西浩兴坤达新能源科技有限公司 | It is a kind of along roof Floor water horizontal well drilling well staged fracturing method |
| WO2019205516A1 (en) * | 2018-04-28 | 2019-10-31 | 中国矿业大学 | System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN110924898A (en) * | 2018-09-19 | 2020-03-27 | 中国石油天然气股份有限公司 | Coal seam stress release device and method |
| US10995572B2 (en) * | 2018-04-28 | 2021-05-04 | China University Of Mining And Technology | Simulation test method for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN113530438A (en) * | 2020-04-16 | 2021-10-22 | 中国石油化工股份有限公司 | Method for safely tripping up and down gas well nitrogen drilling pipe column and gas well structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201458A (en) * | 2015-11-06 | 2015-12-30 | 中国海洋石油总公司 | Well completion method for glass fiber reinforced plastic sieve tube of coal bed gas horizontal well |
| CN105625946A (en) * | 2016-01-25 | 2016-06-01 | 中国石油大学(北京) | Coalbed methane horizontal well supercritical CO2 jet flow cavity construction and multi-segment synchronous deflagration fracturing method |
| CN105986795A (en) * | 2015-02-10 | 2016-10-05 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well coal bed transformation method |
-
2017
- 2017-10-19 CN CN201710989536.4A patent/CN107762451A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105986795A (en) * | 2015-02-10 | 2016-10-05 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well coal bed transformation method |
| CN105201458A (en) * | 2015-11-06 | 2015-12-30 | 中国海洋石油总公司 | Well completion method for glass fiber reinforced plastic sieve tube of coal bed gas horizontal well |
| CN105625946A (en) * | 2016-01-25 | 2016-06-01 | 中国石油大学(北京) | Coalbed methane horizontal well supercritical CO2 jet flow cavity construction and multi-segment synchronous deflagration fracturing method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019205516A1 (en) * | 2018-04-28 | 2019-10-31 | 中国矿业大学 | System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| US10934817B2 (en) | 2018-04-28 | 2021-03-02 | China University Of Mining And Technology | System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| US10995572B2 (en) * | 2018-04-28 | 2021-05-04 | China University Of Mining And Technology | Simulation test method for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN110924898A (en) * | 2018-09-19 | 2020-03-27 | 中国石油天然气股份有限公司 | Coal seam stress release device and method |
| CN110173240A (en) * | 2019-06-19 | 2019-08-27 | 陕西浩兴坤达新能源科技有限公司 | A kind of coal mine gas drainage method |
| CN110306961A (en) * | 2019-06-19 | 2019-10-08 | 陕西浩兴坤达新能源科技有限公司 | It is a kind of along roof Floor water horizontal well drilling well staged fracturing method |
| CN113530438A (en) * | 2020-04-16 | 2021-10-22 | 中国石油化工股份有限公司 | Method for safely tripping up and down gas well nitrogen drilling pipe column and gas well structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107762451A (en) | Well completion method is transformed in a kind of coal bed gas horizontal well payzone underbalance reaming | |
| US7004264B2 (en) | Bore lining and drilling | |
| CN103867119B (en) | Coal reservoir well completion transformation method | |
| CN105443099B (en) | Fracturing process is returned on a kind of preset tubing string completion horizontal well of bore hole | |
| US20120186816A1 (en) | Single-Assembly System and Method for One-Trip Drilling, Casing, Cementing and Perforating | |
| NO342388B1 (en) | Well completion method and well completion apparatus | |
| CN103089194A (en) | Method for completing well by cementing top of expandable screen | |
| CN106460491A (en) | Forming multilateral wells | |
| CN105986795B (en) | Coal bed gas horizontal well coal bed transformation method | |
| US8851178B2 (en) | System and method for fracturing while drilling | |
| CN109267983B (en) | Horizontal well repeated fracturing device and method based on open hole preset pipe string well completion | |
| CN104912479B (en) | Method for drilling and completion of horizontal branched well for coal bed gas | |
| CN104847263A (en) | Coal bed methane far-end butt joint horizontal well drilling method | |
| CN101285375A (en) | Sleeve expanding method for horizontal well | |
| CN111980706B (en) | Sectional composite coal drawing method for ground horizontal well | |
| CN104912480B (en) | Coal bed gas near-end docks the brill completion method of horizontal well | |
| CN108194071A (en) | 3 very little half sidetracking slim hole staged fracturing string | |
| CN110410053A (en) | Coal mine roof plate pressure relief method based on eyelet supporting | |
| CN100575659C (en) | A kind of insufficient balance well completion method | |
| CN111472689A (en) | Expansion suspension type tail pipe drilling operation device and operation method | |
| CN106837171A (en) | A kind of compact reservoir radial direction boring means external member | |
| CN112267866B (en) | Small-diameter pipe staged fracturing production pipe column and method for side drilling well and small-hole well | |
| CN104963656B (en) | A kind of casing programme and its installation method for natural petroleum gas field | |
| CN205135416U (en) | Inflation formula tail pipe drilling operation device | |
| CN111706305A (en) | Selective segmented well cementation process and well body structure of double-target-layer coal bed gas well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180306 |