CN112252982A - Casing method for fragile stratum or broken stratum - Google Patents
Casing method for fragile stratum or broken stratum Download PDFInfo
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- CN112252982A CN112252982A CN202011423158.1A CN202011423158A CN112252982A CN 112252982 A CN112252982 A CN 112252982A CN 202011423158 A CN202011423158 A CN 202011423158A CN 112252982 A CN112252982 A CN 112252982A
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- casing
- well
- completion
- stratum
- vibration generator
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 36
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000003245 coal Substances 0.000 abstract description 16
- 239000004576 sand Substances 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000010355 oscillation Effects 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 235000013580 sausages Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Images
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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of well completion methods of petroleum drilling and coal bed gas drilling, in particular to a casing running method of a fragile stratum or a crushed stratum. The casing running method provided by the invention can be used for generating oscillation waves by the vibration generator aiming at the fragile stratum or the crushed stratum or the coal bed, so that the problem that the casing running meets the blockage caused by that a large number of blocks are removed due to the fact that a well wall is corroded and sand bridges are easily formed in the gas well completion of the fragile stratum or the crushed stratum or the coal bed is easily formed can be effectively solved, the casing running operation of the well completion can be safely and quickly completed under the existing equipment condition, the once casing running success rate of the fragile stratum or the crushed stratum or the coal bed is greatly improved, meanwhile, the casing running method can also realize a vibration well cementation technology, the well cementation quality is greatly improved, the occurrence rate of complex accidents is effectively reduced, and the well completion cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and coal bed gas drilling well completion methods, in particular to a casing running method for a fragile stratum or a crushed stratum.
Background
Along with the development of social economy, the resource demand is larger and larger, the resource exploitation environment is worse and worse, and the encountered conditions are more and more. With the development of petroleum and natural gas resources and coal bed gas, well completion engineers are always puzzled by the problem that easily (already) broken strata and coal bed well completion casing strings are difficult to run into the well bottom, the commonly adopted casing running method is a method for reducing the use amount of a casing centralizer and stopping small-displacement circulation of a pump when the casing is run, the conventional casing running method is carried out under the condition of sacrificing the casing centering degree, the common method that the casing is not blocked can be removed, and a suitable specific casing running method needs to be found. When the casing is arranged in the easily (already) broken stratum and coal bed, the casing clamping accident may be caused by rock debris and broken mud cakes which are collapsed from the well wall and are unstably degraded, even the pump blocking accident may be caused by the collapse of the well wall in the well cementation process, the sausage filling accident may be seriously caused, a large amount of manpower, material resources and time loss is caused, and even the well is seriously scrapped.
Disclosure of Invention
The invention provides a casing running method for a fragile stratum or a crushed stratum, which overcomes the defects of the prior art and can effectively solve the problem that the casing is jammed caused by accidents such as collapse of a well wall, unstable and degraded rock debris, insufficient mud cakes and the like in the process of running a well completion casing string of the fragile stratum or the crushed stratum and the like.
The technical scheme of the invention is realized by the following measures: a method of casing a friable or fractured formation, comprising the steps of: firstly, fixedly mounting a vibration generator between a casing shoe and a floating collar of a well completion casing string; secondly, pumping drilling completion fluid into the well completion casing string to establish circulation after the well completion casing string part provided with the vibration generator is put into a well, wherein the drilling completion fluid flows through the vibration generator and then flows out from the bottom of the well completion casing string to form annular fluid; thirdly, stopping circulation, and continuing to put the casing string to the bottom of the well; and fourthly, performing well cementation operation according to a conventional hydraulic pulse well cementation method.
The following is further optimization or/and improvement of the technical scheme of the invention:
in the second step, a drilling completion fluid is pumped into the completion string in a variable displacement manner to establish circulation.
In the second step, in the process of putting the well completion casing string provided with the vibration generator into the well, the well wall collapses, the casing operation is stopped, and the well drilling completion fluid is pumped into the well completion casing string to establish circulation.
The flow rate of the well completion return fluid is less than or equal to 1.0 m/min and more than 0.
The vibration generator is a hydraulic pulse generator.
The casing running method provided by the invention can be used for generating oscillation waves by the vibration generator aiming at the fragile stratum or the crushed stratum or the coal bed, so that the problem that the casing running meets the blockage caused by that the gas well completion of the fragile stratum or the crushed stratum or the coal bed is degraded to a large number of falling blocks and sand bridge is easily formed due to well wall erosion can be effectively solved, the casing running operation of the well completion can be safely and quickly completed under the existing equipment condition, the once casing running success rate of the fragile stratum or the crushed stratum or the coal bed is greatly improved, the casing running method is simple to operate, and meanwhile, the casing running method can also realize a vibration well cementation technology, the well cementation quality is greatly improved, the occurrence of complex accident rate is effectively reduced, and the well completion cost is greatly reduced.
Drawings
FIG. 1 is a schematic view of the invention as it would appear when the well wall is collapsed during running of the completion string.
FIG. 2 is a schematic diagram of the state of the invention after the sand bridge is destroyed by the hydraulic pulse generator after the drilling completion fluid is injected.
FIG. 3 is a schematic diagram of the state of the present invention in cementing.
The codes in the figures are respectively: the well completion system comprises a well completion casing pipe string 1, a vibration generator 2, a well drilling completion fluid 3, a well wall 4, a dropping block 5, cement slurry 6, a displacement fluid 7 and a well drilling completion return fluid 8.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
In the present invention, the completion fluid used is a conventional completion fluid.
The invention is further described below with reference to the following examples:
example 1: as shown in the attached figures 1, 2 and 3, the casing running method of the fragile stratum or the crushed stratum comprises the following steps: firstly, fixedly mounting a vibration generator 2 between a casing shoe and a floating collar of a well completion casing string 1; secondly, after a part of the well completion casing string 1 provided with the vibration generator 2 is put into a well, pumping well completion fluid 3 into the well completion casing string 1 to establish circulation, wherein the well completion fluid 3 flows through the vibration generator 2 and then flows out from the bottom of the well completion casing string 1 to form annular fluid, when the well completion fluid 3 flows through the vibration generator 2, the vibration generator 2 and the well completion casing string 1 vibrate together, the vibration generator 2 and the well completion casing string 1 vibrate to generate the annular fluid, and accordingly, the fallen blocks 5 corroded by the well wall 4 are carried out of the well and are brought to the ground; thirdly, stopping circulation, and continuing to put the casing string to the bottom of the well; and fourthly, performing well cementation operation according to a conventional hydraulic pulse well cementation method.
Example 2: as shown in the attached figures 1, 2 and 3, the casing running method of the fragile stratum or the crushed stratum comprises the following steps: firstly, fixedly mounting a vibration generator 2 between a casing shoe and a floating collar of a well completion casing string 1; secondly, after the part of the well completion casing string 1 provided with the vibration generator 2 is put into a well, stopping casing running operation, pumping well completion fluid 3 into the well completion casing string 1, enabling the well completion fluid 3 to flow through the vibration generator 2 and then flow out from the bottom of the well completion casing string 1 to form annular fluid, enabling the vibration generator 2 and the well completion casing string 1 to vibrate together when the well completion fluid 3 flows through the vibration generator 2, enabling the annular fluid to fluctuate together with the vibration generated by the vibration generator 2 and the well completion casing string 1, and carrying the falling block 5 out of a well shaft and bringing the falling block to the ground; thirdly, stopping circulation, and continuing to put the casing string 1 to the bottom of the well; fourthly, performing conventional hydraulic pulse well cementation operation according to the attached figure 3.
The following two situations may occur during the run-in of the completion casing string 1: in the first case, collapse and degradation of the well wall 4 occurs during the run-in of the completion casing string 1, which is performed according to an embodiment of the present invention; in another case, the well wall 4 is not collapsed in the process of putting the completion casing string 1 into the well, and in this case, the completion casing string 1 is put into the well bottom at one time and the well cementation operation is carried out according to the conventional hydraulic pulse well cementation method.
The invention effectively destroys the sand bridge through the vibration wave generated by the vibration generator 2 (which can be a hydraulic pulse generator), avoids the phenomenon that the casing meets the blocking due to the sand bridge which is easily formed by a large number of falling blocks 5 and settled sand because the well wall 4 is corroded, ensures that the casing running operation of well completion can be safely and quickly completed under the condition of the existing equipment, greatly improves the once casing running success rate of fragile stratum or crushed stratum or coal bed, simultaneously can realize the vibration well cementation technology, greatly improves the well cementation quality, effectively reduces the occurrence of complexity and accident rate, greatly reduces the well completion cost, and provides a good path for the safe casing running of the fragile stratum or crushed stratum or coal bed.
Example 3: as shown in fig. 1, 2 and 3, the casing running method of the fragile stratum or the crushed stratum is carried out according to the following steps: firstly, fixedly mounting a vibration generator 2 between a casing shoe and a floating collar of a well completion casing string 1; secondly, after a part of the well completion casing string 1 provided with the vibration generator 2 is put into a well, stopping casing running operation, pumping well completion fluid 3 into the well completion casing string 1 in a variable displacement mode, enabling the well completion fluid 3 to flow through the vibration generator 2 and then flow out from the bottom of the well completion casing string 1 to form annular fluid, enabling the vibration generator 2 and the well completion casing string 1 to generate vibration with different frequencies when the well completion fluid 3 flows through the vibration generator 2, and enabling the annular fluid to fluctuate due to the vibration generated by the vibration generator 2 and the well completion casing string 1, so that the falling block 5 is carried out of a wellbore and carried to the ground; thirdly, stopping circulation, and continuing to put the casing string 1 to the bottom of the well; fourthly, performing conventional hydraulic pulse well cementation operation according to the attached figure 3.
The wall collapse and the ablation occur in the well completion casing pipe string 1 in the well entering process and form a sand bridge, the well drilling completion fluid 3 is pumped into the well completion casing pipe string 1 in a variable displacement mode in the second step, the well drilling completion fluid 3 flows through the vibration generator 2 to enable the vibration generator 2 to generate vibration waves with different frequencies, and the speed of breaking the sand bridge formed by the accumulation of the falling blocks 5 and carrying the falling blocks 5 out of a shaft by the annular well drilling completion fluid is accelerated.
Example 4: as an optimization of the above embodiment, the flow rate of the drilling completion flowback fluid 8 is less than or equal to 1.0 m/min and greater than 0.
Example 5: as an optimization of the above embodiment, the vibration generator is a hydraulic pulse generator.
In conclusion, the casing running method provided by the invention can be used for generating oscillation waves by the vibration generator aiming at the fragile stratum or the crushed stratum or the coal bed, so that the problem that the casing running meets the blockage caused by that a large number of blocks are removed due to the fact that a well wall is corroded and sand bridge is easily formed in the gas well completion of the fragile stratum or the crushed stratum or the coal bed can be effectively solved, the well completion casing running operation can be safely and quickly completed under the existing equipment condition, the once casing running success rate of the fragile stratum or the crushed stratum or the coal bed is greatly improved, the casing running method is simple to operate, meanwhile, the vibration well cementation technology can be realized, the well cementation quality is greatly improved, the occurrence of complex accident rate is effectively reduced, and the well completion cost is greatly reduced.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (8)
1. A method of casing a friable or fractured formation, comprising the steps of: firstly, fixedly mounting a vibration generator between a casing shoe and a floating collar of a well completion casing string; secondly, pumping drilling completion fluid into the well completion casing string to establish circulation after the well completion casing string part provided with the vibration generator is put into a well, wherein the drilling completion fluid flows through the vibration generator and then flows out from the bottom of the well completion casing string to form annular fluid; thirdly, stopping circulation, and continuing to put the casing string to the bottom of the well; and fourthly, performing well cementation operation according to a conventional hydraulic pulse well cementation method.
2. The method of casing a friable or crushed earth formation according to claim 1, wherein in the second step, a drilling completion fluid is pumped into the completion casing string in a variable displacement manner to establish circulation.
3. A method of casing a friable or crushed earth formation according to claim 1 or 2, wherein in the second step, during the lowering of the string of completion casing pipes fitted with vibration generators into the well, the walls of the well collapse, the casing operation is stopped, and a drilling completion fluid is pumped into the string of completion casing pipes to establish circulation.
4. A method of casing a friable or crushed earth formation according to claim 1 or 2, characterized in that the flow rate of drilling completion returns is less than or equal to 1.0 m/min and greater than 0.
5. A method of casing a friable or crushed earth formation according to claim 3, wherein the flow rate of drilling completion returns is less than or equal to 1.0 m/min and greater than 0.
6. A method of casing a friable or crushed earth formation according to claim 1 or 2 or 5, characterized in that the vibration generator is a hydraulic pulse generator.
7. A method of casing a friable or crushed earth formation according to claim 3, characterized in that the vibration generator is a hydraulic pulse generator.
8. A method of casing a friable or crushed earth formation according to claim 4, characterized in that the vibration generator is a hydraulic pulse generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423158.1A CN112252982A (en) | 2020-12-08 | 2020-12-08 | Casing method for fragile stratum or broken stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423158.1A CN112252982A (en) | 2020-12-08 | 2020-12-08 | Casing method for fragile stratum or broken stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112252982A true CN112252982A (en) | 2021-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011423158.1A Pending CN112252982A (en) | 2020-12-08 | 2020-12-08 | Casing method for fragile stratum or broken stratum |
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| CN (1) | CN112252982A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1756890A (en) * | 2003-02-26 | 2006-04-05 | 埃克森美孚上游研究公司 | Method for drilling and completing wells |
| CN201250628Y (en) * | 2008-09-09 | 2009-06-03 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Downhole hydraulic machine vibration pulse generator |
| WO2012015528A1 (en) * | 2010-07-30 | 2012-02-02 | Exxonmobil Upstream Research Company | Enhanced hydrocarbon fluid recovery via formation collapse |
| CN102877813A (en) * | 2012-09-30 | 2013-01-16 | 中国石油集团西部钻探工程有限公司 | Halfway gas-filling well cementing method |
| CN105696970A (en) * | 2016-04-14 | 2016-06-22 | 东营万邦石油科技有限责任公司 | Intermittent liquid flow impacting type well cementation vibrator |
| CN106555566A (en) * | 2016-12-07 | 2017-04-05 | 中国石油集团西部钻探工程有限公司 | Frangible stratum or the cementing method on broken stratum |
| CN111058796A (en) * | 2019-11-25 | 2020-04-24 | 西南石油大学 | Method for improving shale gas well oil layer casing well cementation quality |
-
2020
- 2020-12-08 CN CN202011423158.1A patent/CN112252982A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1756890A (en) * | 2003-02-26 | 2006-04-05 | 埃克森美孚上游研究公司 | Method for drilling and completing wells |
| CN201250628Y (en) * | 2008-09-09 | 2009-06-03 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Downhole hydraulic machine vibration pulse generator |
| WO2012015528A1 (en) * | 2010-07-30 | 2012-02-02 | Exxonmobil Upstream Research Company | Enhanced hydrocarbon fluid recovery via formation collapse |
| CN102877813A (en) * | 2012-09-30 | 2013-01-16 | 中国石油集团西部钻探工程有限公司 | Halfway gas-filling well cementing method |
| CN105696970A (en) * | 2016-04-14 | 2016-06-22 | 东营万邦石油科技有限责任公司 | Intermittent liquid flow impacting type well cementation vibrator |
| CN106555566A (en) * | 2016-12-07 | 2017-04-05 | 中国石油集团西部钻探工程有限公司 | Frangible stratum or the cementing method on broken stratum |
| CN111058796A (en) * | 2019-11-25 | 2020-04-24 | 西南石油大学 | Method for improving shale gas well oil layer casing well cementation quality |
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Application publication date: 20210122 |