CA2500155A1 - Percussion adaptor for positive displacement motors - Google Patents
Percussion adaptor for positive displacement motors Download PDFInfo
- Publication number
- CA2500155A1 CA2500155A1 CA 2500155 CA2500155A CA2500155A1 CA 2500155 A1 CA2500155 A1 CA 2500155A1 CA 2500155 CA2500155 CA 2500155 CA 2500155 A CA2500155 A CA 2500155A CA 2500155 A1 CA2500155 A1 CA 2500155A1
- Authority
- CA
- Canada
- Prior art keywords
- pdm
- drilling
- torque tube
- drill bit
- piston
- 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.)
- Abandoned
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 6
- 238000009527 percussion Methods 0.000 title claims description 12
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 230000004913 activation Effects 0.000 claims 3
- 238000000034 method Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000005755 formation reaction Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 abstract description 2
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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/10—Down-hole impacting means, e.g. hammers continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
-
- 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
- E21B6/00—Drives for drilling with combined rotary and percussive action
-
- 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
- E21B6/00—Drives for drilling with combined rotary and percussive action
- E21B6/06—Drives for drilling with combined rotary and percussive action the rotation being intermittent, e.g. obtained by ratchet device
- E21B6/08—Separate drives for percussion and rotation
Landscapes
- 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)
- Earth Drilling (AREA)
Abstract
Positive Displacement Motors (PDM) are widely used in the oil and gas industry as an adjunct for drilling a hole in earthen formations. The PDM uses pressure and flow of the drilling fluid to turn a rotor within a stator. The rotor then turns a drill bit which removes earthen cuttings, creating the hole. The drilling fluid then captures the earthen cuttings and removes them from the hole. When drilling with a PDM, the drill string does not have to be rotated to drill (as is the case with conventional drilling) and this allows the drill string to be oriented - resulting in directional drilling.
If one could add a percussive force to the drill bit on the PDM, the drilling rate of penetration could be significantly increased, the required weight on bit could be significantly reduced and torque required to turn the drill bit could be significantly reduced. All in all, a "percussionized" PDM would be a far more efficient drilling tool.
If one could add a percussive force to the drill bit on the PDM, the drilling rate of penetration could be significantly increased, the required weight on bit could be significantly reduced and torque required to turn the drill bit could be significantly reduced. All in all, a "percussionized" PDM would be a far more efficient drilling tool.
Description
Disclosure This invention relates to the use of a Positive Displacement Motor (PDM) for boring earthen holes.
It has been well documented that providing a percussion force to a rotating drill bit will make the drill bit drill faster. The percussive force helps to break away portions of the drilled formation.
When drilling in hard earthen formations with a PDM, one must place a great deal of weight on the drill bit in order to break away pieces of formation and create a drilled hole. The placement of excessive weight on the drill bit causes the following problems:
1. Potential to stall the PDM rotor, with a stoppage of drilling.
It has been well documented that providing a percussion force to a rotating drill bit will make the drill bit drill faster. The percussive force helps to break away portions of the drilled formation.
When drilling in hard earthen formations with a PDM, one must place a great deal of weight on the drill bit in order to break away pieces of formation and create a drilled hole. The placement of excessive weight on the drill bit causes the following problems:
1. Potential to stall the PDM rotor, with a stoppage of drilling.
2. Potential to deviate from the expected wellbore, as the PDM follows formation planes.
~. Potential to create more torque in the drill string, making it difficult to orient the drill bit.
4. Potential to shorten the useful life of the PDM itself due to greater pressures within the PDNI components.
Bv adding a percussive force to the drill bit, the PDM could operate with significantly less weight on the drill bit. thus alleviating the above problems.
The rate of penetration (ROP) of a drilling device has a direct bearing on the economics of a drilling operation. A modern drilling rig with all its associated services can be a hugely expensive operation. It is very obvious that if a PDM operating in a percussion mode, could drill significantly faster than a conventional PDM, the economic savings could also be significant.
The invention described herewith is called a "Percussion Adaptor for Positive Displacement Motors". In drawings which illustrate embodiments of the invention, Figures 1, 2a, 2b, 3 and 4 show longitudinal sectional views of the Percussion Adaptor for Positive Displacement Motors.
The tool comprises an upper casing l, lower casing 2 and casing connector 3 which form the outer body of the tool. The upper casing 1 is threaded into the lower portion of a PDM, which is modified to accept the upper casing threaded area.
Within the casings there is a torque tube 4, which transmits the torque from the PDM
rotor to a drill bit, which is fastened by threads to the bottom of the torque tube 4. The torque tube 4 is connected to the PDM rotor via a sliding spline on the upper end of the torque tube 4. The spline arrangement allows longitudinal motion of the torque tube 4 within the casings 1,2,3 , which is essential to the operation of the Percussion Adaptor.
The longitudinal motion of the torque tube 4 is limited by a drive sub 8, which is threaded into the lower casing 2. In addition, the drive sub 8 acts as a bearing surface for the rotating torque tube 4.
The tool further includes a sliding piston 7, which is able to impart blows to the lower end of the torque tube 4. The energy of the blows is then transferred to a drill bit which is threaded into the lowest end of the torque tube 4. The outer surface of the piston slides within the confines of the lower casing 2, while the inner surface of the piston slides along the piston liner 6. The piston liner 6 is held in place by the threaded junction of the lower casing 2 and the casing connector 3.
The torque tube 4 is further stabilized by the upper torque tube bearing 5.
The upper torque tube bearing 5 is held in place by the threaded junction of the upper casing l and the casing connector 3. The piston liner 6 is also a bearing surface for the torque tube 4.
The upper torque tube bearing 5, piston liner 6, and torque tube 4 are all ported to allow the flow of drilling fluids under pressure. The specific arrangement of these ports allow for the required passage of drilling fluid to activate the piston into a reciprocating motion, providing the impact blows to the lower portion of the torque tube 4.
Whenever drilling fluid is circulating through the Percussion Adaptor, the torque tube 4 will be necessarily rotating because of the action of the PDM. It is the longitudinal position of the torque tube 4 which is critical to percussion action of the piston 7. When there is no weight on the PDM and Percussion Adaptor, the tool is in a "circulation only"
mode, as demonstrated in Figure 4. In this mode, the drilling fluid passes through the upper torque tube bearing 5 and into the torque tube :~ and then passes strai~~ht throu'.rh the torque tube -1 and out through the drill bit. There is no piston motion in this mode.
Typically this mode is used for tlushin~~ cuttings out the wellbore with the circulation of the drilling fluid.
When the PDM and Percussion Adaptor are "on bottom" with weight applied. the torque tube =1 moves longitudinally upward. as shown in Figure 2a. In this mode. the drilling fluid is now routed into the torque tube 4 through a different port, which causes the drilling fluid to enter the bottom of the piston chamber, forcing the piston 7 upward. The drilling fluid above the piston is vented into a different passageway in the torque tube and is expelled through the drill bit.
As the torque tube 4 rotates, the drilling fluid now is forced into the upper piston chamber (see Figure 2b) causes the piston to be forced down to strike the torque tube ~. The drilling fluid below the piston is evacuated to the torque tube 4 and out through the drill bit. As the torque tube 4 further rotates, the cycle repeats itself and the piston reciprocates, providing a percussive force through the torque tube 4 to the drill bit.
When the PDM and Percussion Adaptor are lifted off bottom, the torque tube 4 drops longitudinally and the circulation mode, as shown in Figure 4, is restored.
~. Potential to create more torque in the drill string, making it difficult to orient the drill bit.
4. Potential to shorten the useful life of the PDM itself due to greater pressures within the PDNI components.
Bv adding a percussive force to the drill bit, the PDM could operate with significantly less weight on the drill bit. thus alleviating the above problems.
The rate of penetration (ROP) of a drilling device has a direct bearing on the economics of a drilling operation. A modern drilling rig with all its associated services can be a hugely expensive operation. It is very obvious that if a PDM operating in a percussion mode, could drill significantly faster than a conventional PDM, the economic savings could also be significant.
The invention described herewith is called a "Percussion Adaptor for Positive Displacement Motors". In drawings which illustrate embodiments of the invention, Figures 1, 2a, 2b, 3 and 4 show longitudinal sectional views of the Percussion Adaptor for Positive Displacement Motors.
The tool comprises an upper casing l, lower casing 2 and casing connector 3 which form the outer body of the tool. The upper casing 1 is threaded into the lower portion of a PDM, which is modified to accept the upper casing threaded area.
Within the casings there is a torque tube 4, which transmits the torque from the PDM
rotor to a drill bit, which is fastened by threads to the bottom of the torque tube 4. The torque tube 4 is connected to the PDM rotor via a sliding spline on the upper end of the torque tube 4. The spline arrangement allows longitudinal motion of the torque tube 4 within the casings 1,2,3 , which is essential to the operation of the Percussion Adaptor.
The longitudinal motion of the torque tube 4 is limited by a drive sub 8, which is threaded into the lower casing 2. In addition, the drive sub 8 acts as a bearing surface for the rotating torque tube 4.
The tool further includes a sliding piston 7, which is able to impart blows to the lower end of the torque tube 4. The energy of the blows is then transferred to a drill bit which is threaded into the lowest end of the torque tube 4. The outer surface of the piston slides within the confines of the lower casing 2, while the inner surface of the piston slides along the piston liner 6. The piston liner 6 is held in place by the threaded junction of the lower casing 2 and the casing connector 3.
The torque tube 4 is further stabilized by the upper torque tube bearing 5.
The upper torque tube bearing 5 is held in place by the threaded junction of the upper casing l and the casing connector 3. The piston liner 6 is also a bearing surface for the torque tube 4.
The upper torque tube bearing 5, piston liner 6, and torque tube 4 are all ported to allow the flow of drilling fluids under pressure. The specific arrangement of these ports allow for the required passage of drilling fluid to activate the piston into a reciprocating motion, providing the impact blows to the lower portion of the torque tube 4.
Whenever drilling fluid is circulating through the Percussion Adaptor, the torque tube 4 will be necessarily rotating because of the action of the PDM. It is the longitudinal position of the torque tube 4 which is critical to percussion action of the piston 7. When there is no weight on the PDM and Percussion Adaptor, the tool is in a "circulation only"
mode, as demonstrated in Figure 4. In this mode, the drilling fluid passes through the upper torque tube bearing 5 and into the torque tube :~ and then passes strai~~ht throu'.rh the torque tube -1 and out through the drill bit. There is no piston motion in this mode.
Typically this mode is used for tlushin~~ cuttings out the wellbore with the circulation of the drilling fluid.
When the PDM and Percussion Adaptor are "on bottom" with weight applied. the torque tube =1 moves longitudinally upward. as shown in Figure 2a. In this mode. the drilling fluid is now routed into the torque tube 4 through a different port, which causes the drilling fluid to enter the bottom of the piston chamber, forcing the piston 7 upward. The drilling fluid above the piston is vented into a different passageway in the torque tube and is expelled through the drill bit.
As the torque tube 4 rotates, the drilling fluid now is forced into the upper piston chamber (see Figure 2b) causes the piston to be forced down to strike the torque tube ~. The drilling fluid below the piston is evacuated to the torque tube 4 and out through the drill bit. As the torque tube 4 further rotates, the cycle repeats itself and the piston reciprocates, providing a percussive force through the torque tube 4 to the drill bit.
When the PDM and Percussion Adaptor are lifted off bottom, the torque tube 4 drops longitudinally and the circulation mode, as shown in Figure 4, is restored.
Claims (2)
1. The activation of the piston. which provides the percussive effect, is via the rotary motion of the torque tube 4. No percussive devices currently use this method of piston activation.
2. The Percussion Adaptor becomes an integral part of the Positive Displacement Motor (PDM). The torque tube 4 becomes a physical extension of the PDM rotor, rotating the drill bit and providing drilling fluid under pressure for activation of the piston 7. This is a new and unique design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2500155 CA2500155A1 (en) | 2005-03-14 | 2005-03-14 | Percussion adaptor for positive displacement motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2500155 CA2500155A1 (en) | 2005-03-14 | 2005-03-14 | Percussion adaptor for positive displacement motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2500155A1 true CA2500155A1 (en) | 2006-09-14 |
Family
ID=36998129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2500155 Abandoned CA2500155A1 (en) | 2005-03-14 | 2005-03-14 | Percussion adaptor for positive displacement motors |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2500155A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009014444A1 (en) | 2007-07-24 | 2009-01-29 | Sonicsampdrill B.V. | Drill device having a rotary-vibratory drive |
| CN105484665A (en) * | 2015-12-31 | 2016-04-13 | 西南石油大学 | Gas drive liquid self-circulation gas drilling positive screw drill |
| EP2260172A4 (en) * | 2008-03-13 | 2016-05-04 | Bbj Tools Inc | Wellbore drilling accelerator and tubular connection |
| US9624725B2 (en) | 2008-03-13 | 2017-04-18 | Nov Worldwide C.V. | Wellbore percussion adapter and tubular connection |
| CN109779520A (en) * | 2018-07-27 | 2019-05-21 | 中国石油大学(华东) | A kind of pulse type spiral percussion drilling tool |
-
2005
- 2005-03-14 CA CA 2500155 patent/CA2500155A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009014444A1 (en) | 2007-07-24 | 2009-01-29 | Sonicsampdrill B.V. | Drill device having a rotary-vibratory drive |
| EP2260172A4 (en) * | 2008-03-13 | 2016-05-04 | Bbj Tools Inc | Wellbore drilling accelerator and tubular connection |
| US9624725B2 (en) | 2008-03-13 | 2017-04-18 | Nov Worldwide C.V. | Wellbore percussion adapter and tubular connection |
| CN105484665A (en) * | 2015-12-31 | 2016-04-13 | 西南石油大学 | Gas drive liquid self-circulation gas drilling positive screw drill |
| CN109779520A (en) * | 2018-07-27 | 2019-05-21 | 中国石油大学(华东) | A kind of pulse type spiral percussion drilling tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |