CN111794700A - Method for removing long horizontal section detritus bed - Google Patents
Method for removing long horizontal section detritus bed Download PDFInfo
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- CN111794700A CN111794700A CN202010640344.4A CN202010640344A CN111794700A CN 111794700 A CN111794700 A CN 111794700A CN 202010640344 A CN202010640344 A CN 202010640344A CN 111794700 A CN111794700 A CN 111794700A
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- well
- drilling tool
- bed
- drilling
- horizontal section
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 83
- 238000005520 cutting process Methods 0.000 claims abstract description 32
- 238000011010 flushing procedure Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of petroleum drilling, and particularly relates to a method for removing a long horizontal section detritus bed, which comprises the following steps: 1) during drilling, a plurality of cylinders are sleeved on a drill rod of a drilling tool in a horizontal section of a well; 2) when the drilling tool drills a specified distance, the drilling tool is lifted out of the horizontal section well, the drilling tool and the cylinder are rotated at the same time, and the drilling tool performs back reaming to enable drill cuttings on the well wall to be moved to the ground; 3) step 2), cleaning a shaft once by using a well flushing fluid every time the drilling tool drills a set distance; the problems that in the existing drilling process of an ultra-long horizontal section well, a detritus bed is easy to form and is difficult to eliminate, the friction area and the friction coefficient of a drilling tool and a well wall are increased, the friction resistance of the drilling tool is large, and the well completion risk is high are solved, the formation of the detritus bed is prevented by the aid of the hydraulic and mechanical double functions, and the formed detritus bed can be better removed and damaged.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling, and particularly relates to a method for removing a long horizontal section detritus bed.
Background
During the drilling process of the horizontal section, drilling fluid continuously carries drill cuttings to the ground so as to ensure the cleanness of a shaft and the normal drilling construction. However, due to the action of gravity, the drill cuttings in the horizontal section are easy to sink and deposit on the lower well wall to form a rock cuttings bed, so that the normal drilling construction is hindered. The successful construction of a well with an ultra-long horizontal section (the horizontal section exceeds 3000 meters) is a key factor to prevent the formation of a drilling cutting bed or eliminate the drilling cutting bed in time.
No special detritus bed eliminating process is adopted in construction of two 3000-meter horizontal section wells in Changqing oil fields in 2018, the formed detritus bed is serious, the friction area and the friction coefficient of a drilling tool and a well wall are increased, the friction resistance of the drilling tool is large, the downward falling friction resistance of the drilling tool reaches 60-90 tons when drilling is finished, and the well completion risk is very high.
Disclosure of Invention
The invention provides a method for removing a long horizontal section rock debris bed, and aims to solve the problems that in the prior art, the rock debris bed is easy to form and difficult to remove in the drilling process of an ultra-long horizontal section well, the friction area and the friction coefficient of a drilling tool and a well wall are increased, the friction resistance of the drilling tool is larger, and the well completion risk is high.
Therefore, the invention provides a method for removing a long horizontal section detritus bed, which comprises the following specific steps:
1) during drilling, a plurality of cylinders are sleeved on a drill rod of a drilling tool in a horizontal section of a well;
2) when the drilling tool drills a specified distance, the drilling tool is lifted out of the horizontal section well, the drilling tool and the cylinder are rotated at the same time, and the drilling tool performs back reaming to enable drill cuttings on the well wall to be moved to the ground;
3) and 2) cleaning the shaft once by using the well flushing fluid every time the drilling tool drills for a set distance.
The outer diameter of the cylinder is 98.6-99% of the borehole diameter.
The length of the cylinder is 50-100 cm.
The outer surface of the cylinder is provided with a plurality of bulges which are uniformly distributed.
The distance between the two adjacent cylinders is 300-500 m.
The specified distance of the step 2) is 500-1000 meters.
And 2) the low shear rate shear force of the drilling fluid in the horizontal section well in the step 2) is greater than 4 Pa.
The set distance of the step 3) is 500 meters, and the dosage of the well-flushing liquid is 80-120m 3.
The Reynolds number of the well-flushing fluid is larger than 2100.
The invention has the beneficial effects that: according to the method for removing the detritus bed in the long horizontal section, during drilling, a plurality of cylinders are sleeved on a drill rod of a drilling tool in a horizontal section well, the outer diameter of each cylinder is 98.6-99% of the diameter of a well hole, the outer diameter of each cylinder is larger than the outer diameter of the drill rod in the well hole, so that the cylinders cannot be blocked when rotating in the horizontal well, drill cuttings formed by the wall of the well hole are stirred to the maximum extent, the length of each cylinder is 50-100cm, bulges are distributed on the surface of each cylinder, the drilling tool and the rigid cylinders can be rotated by starting a pump, better stirring and removing effects can be achieved on the drill cuttings formed by the wall of the well hole, one cylinder is arranged at intervals of 300 meters, the drill cuttings which are not collected on the wall of the well hole; when the drilling is carried out for a specified distance (500-; the low shear rate shear force of the horizontal section drilling fluid is greater than 4Pa, so that the drilling fluid not only has better sand carrying performance in a pump-on circulation state, but also has better rock debris suspension capacity in a pump-off state, and drill cuttings are difficult to sink to the well wall; every drilling time the set distance (500 m) is used, 80-120m3The well-flushing liquid cleans the primary shaft, and the Reynolds number of the cleaning liquid is larger than 2100, so that the well-flushing liquid is in a turbulent state when the shaft is cleaned, and the lower well wall debris bed can be better damaged; the method has the advantages of strong process operability, less equipment requirement, good effect of eliminating the detritus bed in the drilling process of the overlong horizontal section well, reduction of the friction area and the friction coefficient of the drilling tool and the well wall, reduction of the friction resistance of the drilling tool and guarantee of the underground safety.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic view of the structural connection of the drill pipe and the cylinder of a horizontal section of a borehole drilling tool;
FIG. 2 is a schematic view of the lowering friction of the drilling tool in the horizontal section of the three long horizontal section well.
Description of reference numerals: 1. a drill stem; 2. a cylinder; 3. a protrusion; 4. HuaH 16-1; 5. ning H7-2; 6. HuaH 50-7.
Detailed Description
Example 1:
as shown in fig. 1, a method for removing a long horizontal section of a cutting bed comprises the following specific steps:
1) during drilling, a plurality of columns 2 are sleeved on a drill rod 1 of a drilling tool in a horizontal section of a well, and the columns 2 are rigid columns which are solid, durable and not easy to deform; the plurality of rigid columns 2 are distributed on the drill rod 1 at intervals along the horizontal well direction, and can also be distributed according to actual conditions, so that the adaptability and the practicability are strong;
2) when the drilling tool drills a specified distance, the drilling tool is lifted out of the horizontal section well, the drilling tool and the cylinder 2 are rotated at the same time, and the drilling tool performs back reaming to enable drill cuttings on the well wall to be moved to the ground;
3) and 2) cleaning the shaft once by using the well flushing fluid every time the drilling tool drills for a set distance.
The method has strong process operability and less equipment requirement, has good effect of eliminating the detritus bed in the drilling process of the overlong horizontal section well, reduces the friction area and the friction coefficient of the drilling tool and the well wall, reduces the friction resistance of the drilling tool, and ensures the underground safety; the invention has the hydraulic and mechanical double functions of preventing the formation of the detritus bed and better removing and destroying the formed detritus bed.
Example 2:
on the basis of example 1, the outer diameter of the cylinder 2 is 98.6-99% of the borehole diameter. The outer diameter of the drill rod is larger than that of a drill rod in a shaft, so that the cylinder 2 cannot be blocked when rotating in a horizontal well, and drill cuttings formed by the lower shaft wall can be stirred to the maximum extent.
Further, the length of the cylinder 2 is 50-100 cm. The self-weight is reduced and the cost is reduced while the drill cuttings formed by the well wall are stirred to the maximum extent.
Furthermore, the outer surface of the cylinder 2 is provided with a plurality of bulges 3 which are uniformly distributed, the bulges are saw-tooth-shaped bulges, and the saw-tooth-shaped bulges can play a better role in stirring and removing the drill cuttings formed by the wall of the well.
Further, the distance between two adjacent cylinders 2 is 300-500 m. The interval 300-500 m is provided with one, which can timely stir the drill cuttings which are not gathered on the lower well wall, so that the formation of a cuttings bed is difficult.
Further, the specified distance of the step 2) is 500-1000 meters. When the drilling is carried out for 500-1000 meters, the drilling tool in the shaft is gradually lifted out of the horizontal section, and simultaneously the pump is started to rotate the drilling tool, so that the drilling cuttings on the lower well wall are transferred to the well mouth through the stirring of the drilling tool and the rigid column 2, and then the drilling cuttings are brought to the ground and better removed from the well wall.
Further, the low shear rate shear force of the drilling fluid in the horizontal section well in the step 2) is more than 4 Pa. The sand-carrying drilling fluid has better sand-carrying performance in a pump-on circulation state and has better rock debris suspension capacity in a pump-off state, and drill cuttings are difficult to sink to the well wall.
Further, the set distance of the step 3) is 500 meters, and the dosage of the well-flushing liquid is 80-120m3. The Reynolds number of the well-flushing fluid is larger than 2100. The method has no requirement, and only needs to adjust the finally calculated Reynolds number of each performance of the well-flushing liquid to be more than 2100 so as to ensure that the well-flushing liquid is in a turbulent state and can better destroy a lower well wall detritus bed when a shaft is cleaned, so that the method has no limitation on the type of the well-flushing liquid, can select economical and practical well-flushing liquid according to needs, and has strong adaptability and practicability and reduced cost.
Example 3:
on the basis of the embodiment 2, the HuaH 50-7 well constructed in 2019 is located in Huachi county of Gansu province, the well is drilled to the depth of 6266 m, the horizontal section is 4088 m in length, and the method for removing the rock debris bed by the well comprises the following specific steps: the drilling method comprises the steps that during drilling, a rigid cylinder 2 with the outer diameter of 99% of the diameter of a borehole is inserted into a drilling tool assembly every 400 meters, the length of the rigid cylinder 2 is 80cm, and sawtooth-shaped protrusions are distributed on the surface of the rigid cylinder 2;
secondly, when the drilling tool drills for 600 meters, the drilling tool in the shaft is gradually lifted out of a horizontal section, and meanwhile, a pump is started to rotate the drilling tool to perform back reaming so that well wall drilling cuttings are conveyed to the ground; the low shear rate shear force of the horizontal section drilling fluid is 4.5-6 Pa;
four drilling tools are used for 100m each drilling time of 500 m3The well-flushing liquid cleans the primary shaft, and the Reynolds number of the cleaning liquid is 2200-2300.
The process of the invention is used during the construction of the well, the application effect is good, the lowering friction resistance of the drilling tool is 52 tons when drilling is finished, and the length record of the longest horizontal section in the Asia-Pacific area is created. Through the execution of the process, compared with two horizontal wells with the length of the horizontal section of 3000 meters constructed in 2018, the friction resistance is greatly reduced, and the underground safety during the construction of the longer horizontal section is ensured (see the following figure 2).
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. A method of removing a bed of cuttings from a long horizontal section, comprising: the method comprises the following specific steps:
1) during drilling, a plurality of cylinders (2) are sleeved on a drill rod (1) of a drilling tool in a horizontal section well;
2) when the drilling tool drills a specified distance, the drilling tool is lifted out of the horizontal section well, the pump is started to rotate the drilling tool and the column (2), and the drilling tool performs back reaming to enable drill cuttings in the well wall to be moved to the ground;
3) and 2) cleaning the shaft once by using the well flushing fluid every time the drilling tool drills for a set distance.
2. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the outer diameter of the cylinder (2) is 98.6-99% of the borehole diameter.
3. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the length of the cylinder (2) is 50-100 cm.
4. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the outer surface of the cylinder (2) is provided with a plurality of bulges (3) which are uniformly distributed.
5. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the distance between two adjacent cylinders (2) is 300-500 m.
6. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the specified distance of the step 2) is 500-1000 meters.
7. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: and 2) the low shear rate shear force of the drilling fluid in the horizontal section well in the step 2) is greater than 4 Pa.
8. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the set distance of the step 3) is 500 meters, and the dosage of the well-flushing liquid is 80-120m3。
9. The method of removing a bed of long horizontal cuttings of rock defined in claim 1, wherein: the Reynolds number of the well-flushing fluid is larger than 2100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640344.4A CN111794700A (en) | 2020-07-06 | 2020-07-06 | Method for removing long horizontal section detritus bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640344.4A CN111794700A (en) | 2020-07-06 | 2020-07-06 | Method for removing long horizontal section detritus bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111794700A true CN111794700A (en) | 2020-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010640344.4A Pending CN111794700A (en) | 2020-07-06 | 2020-07-06 | Method for removing long horizontal section detritus bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111794700A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377127A (en) * | 2020-11-30 | 2021-02-19 | 西华大学 | Drilling tool with well cleaning function |
| CN113802983A (en) * | 2021-09-18 | 2021-12-17 | 洲际海峡能源科技有限公司 | Method for removing horizontal well debris bed |
Citations (6)
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| US20040040749A1 (en) * | 2002-08-28 | 2004-03-04 | Halliburton Energy Services, Inc. | Method and apparatus for removing cuttings |
| CA2589580A1 (en) * | 2006-05-30 | 2007-11-30 | Bbj Tools Inc. | Cuttings bed removal tool |
| CN204716161U (en) * | 2015-06-05 | 2015-10-21 | 西南石油大学 | A kind of gas horizontal well drilling cutting bed cleanout tool |
| CN204754827U (en) * | 2015-07-09 | 2015-11-11 | 西南石油大学 | Two effect detritus of machinery hydraulic carry instrument |
| CN109403885A (en) * | 2018-12-05 | 2019-03-01 | 深圳越海工程技术有限公司 | A kind of Bidirectional screw type is with borehole wall reshaper |
| CN111188585A (en) * | 2020-01-10 | 2020-05-22 | 大庆石油管理局有限公司 | Tool and method for removing horizontal well debris bed |
-
2020
- 2020-07-06 CN CN202010640344.4A patent/CN111794700A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040040749A1 (en) * | 2002-08-28 | 2004-03-04 | Halliburton Energy Services, Inc. | Method and apparatus for removing cuttings |
| CA2589580A1 (en) * | 2006-05-30 | 2007-11-30 | Bbj Tools Inc. | Cuttings bed removal tool |
| CN204716161U (en) * | 2015-06-05 | 2015-10-21 | 西南石油大学 | A kind of gas horizontal well drilling cutting bed cleanout tool |
| CN204754827U (en) * | 2015-07-09 | 2015-11-11 | 西南石油大学 | Two effect detritus of machinery hydraulic carry instrument |
| CN109403885A (en) * | 2018-12-05 | 2019-03-01 | 深圳越海工程技术有限公司 | A kind of Bidirectional screw type is with borehole wall reshaper |
| CN111188585A (en) * | 2020-01-10 | 2020-05-22 | 大庆石油管理局有限公司 | Tool and method for removing horizontal well debris bed |
Non-Patent Citations (1)
| Title |
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| 陈安明等: "大位移钻井岩屑床影响因素分析及清除技术探究", 《电子测试》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377127A (en) * | 2020-11-30 | 2021-02-19 | 西华大学 | Drilling tool with well cleaning function |
| CN113802983A (en) * | 2021-09-18 | 2021-12-17 | 洲际海峡能源科技有限公司 | Method for removing horizontal well debris bed |
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Application publication date: 20201020 |
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| RJ01 | Rejection of invention patent application after publication |