CA2045036A1 - Adjustable bent sub - Google Patents
Adjustable bent subInfo
- Publication number
- CA2045036A1 CA2045036A1 CA 2045036 CA2045036A CA2045036A1 CA 2045036 A1 CA2045036 A1 CA 2045036A1 CA 2045036 CA2045036 CA 2045036 CA 2045036 A CA2045036 A CA 2045036A CA 2045036 A1 CA2045036 A1 CA 2045036A1
- Authority
- CA
- Canada
- Prior art keywords
- housing
- mandrel
- splined
- thrust
- section
- 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
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 description 4
- 230000013011 mating Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
TITLE: Adjustable Bent Housing INVENTOR: Walenty Michalik An adjustable bent sub for use in directional drilling has a bent mandrel having a splined section, a bent housing having a thrust end and a distinct splined end and being rotatable in relation to the bent mandrel, the splined section of the mandrel being engagable and disengagable with the splined end of the housing, a first shoulder on the mandrel, a second shoulder on the thrust end of the housing, and the first and second shoulders abutting each other for transmitting thrust forces. The bent sub then includes two rotatable parts (the mandrel and the housing), in which thrust forces are transmitted downhole without passing through the splines which hold the rotatable parts fixed in relation to each other. The housing is separable in two parts for allowing the engaging and disengaging of the splined section of the mandrel and the splined end of the housing.
Description
204~Q36 FI~LD OF T~E INVENTION
...... _ This invention relates to apparatus used for directional drilling in earth formations.
BACRGROUND OF ~HE INV~NTION
A drilling system widely used in the oil and gas industry includes, in descending order at the end of a drill string, a mud motor, a bent sub, a bearing system and a drilling bit. This invention deals with the bent sub, the other components being standard in the industry.
The mud motor is powered by mud pumped into the drill string at the surface. The bent sub is used to connect the mud motor to the bearing system and to provide an offset angle for directional drilling. That is, the bent sub is bent so that the axis of the drill string at the drilling bit is offset from the angle of the drill string at the mud motor. The bent sub may be fixed or adjustable. The tool components described in this patent, such as the mandrel, housing and drive housing are all tubular or cylindrical and where an axis is referred to that axis means the line about which the tool component defines a solid of rotatio~.
Direction of drilling may be controlled with a fixed bent sub by using the technique referred to in United States patent no. 4,667,751 to Geczy et al. In that patent a technique is described in which the drill bit will drill straight when both the drill string and the motor are rotated, and the bit will deviate in a desired direction when only the motor is rotated and the drill string is kept stationary.
Direction of drilling may be accomplished with an adjustab:Le bent sub by using the technique described in United States patent no. 4,813,497 to Wenzel. In the Wenzel patent, the bent sub and :,, -:. , . ` :, -- 204S0~0 adjacent mandrel have a bent section each that are rotatable with respect to each other about the axis of the drill string, and the direction of drilling can be controlled by rotating the bent sections with respect to each other. If the bends of the bent sections are the same amount, say 1 degree, then the maximum bend is 2 degrees and the minimum is O degrees.
The Wenzel patent provides for the rotation of the bent sub between the bends by providing the bent sub in three sections, a locking nut, a sleeve and a sub housing. The sleeve and sub housing each include complementary mating ends each having a row of teeth that engage the teeth on the other mating end. The locking nut threads onto the mandrel and is backed off to allow the teeth on the end of the sleeve to clear the teeth of the sub housing for rotation of the sleeve with respect to the housing. The bent sub is connected on one end to the motor housing and on the other end to a mandrel. The two bends are provided in the mandrel and the sub housing.
This construction is disadvantageous in that the teeth transmit some of the downhole thrust forces and thus undergo considerable stress during drilling, with the consequence that they become susceptible to breaking.
SUMMARY OF THE IMVENTION
This invention provides, in one aspect, an adjustable bent sub comprising: a bent mandrel having a splined section; a bent housing having a thrust end and a distinct splined end and being rotatable in relation to the bent mandrel; the splined section of the mandrel being engagable and disengagable with the ~ . . . .
-. :. :. ~ : , : -- -`` 2 0 ~ 6 splined end of the housing; and the mandrel having means abutkable against the thrust end of the housing for transmitting thrust forces from the housing to the mandrel.
In another aspect the adjustable bent sub is further defined by the thrust end of the housing being movable longitudinally with respect to the splined end of the housing from a locked position in which the splined section of the mandrel is interlocked with the splined end of the housing to an unlocked position in which the splined section of the mandrel is disengagable from the splinded end of the housing.
In another aspect, the adjustable bent sub may include: a first shoulder on the mandrel; a second shoulder on the thrust end of the housing; and the first and second shoulders abutting each other for transmitting thrust forces, and further may include the mandrel including a back nut having an end and the first shoulder forming the end of the back nut.
BRIEF DE8CRIPTION OF THE DRaWINGS
There will now be described a preferred embodiment of the invention, with reference to the drawings, by way of illustration, in which like numerals denote like elements and in which: -Figure l is a cross-section of a bent sub according ~ ~ ;
to the invention, with splines in a first position;
Figure 2 is a cross-section of the bent sub of Fig.
1, with tha splines in a second position;
Figure 3 is a section along the line 3 - 3 in Fig.
1; and Figure 4 is a plan view of the bent sub and connecting mandrel of Fig. l.
20~36 _. 5 _ DESCR:I:PTION OF PR13~ERRED EMBODXMl~NT.
Physical Configuration Referring to Figs. 1, 2 and 3, there is shown a bent sub 10 made up of housing 34 and mandrel 12 according to the invention in two different operating positions. Fig. 1 shows interlocking splines in engaged position, as used during drilling, and Fig, 2 shows disengaged splines as used for changing the angle of drilling as defined by the bends 40 and 50 in the housing 34 (at 40) and mandrel 12 (at 50). Fig. 3 shows the interlocking splines in engaged position.
Mandrel 12 has a threaded section 14 having a first diameter, and a splined section 16 having a second diameter. Splines 20 and 22 are provided on the mandrel 12 in pairs longitudinally arranged on the splined section 16 and are circumferentially spaced about the splined section 16, with gaps 24 between them, and gaps 26 between the splines 22 and the wider part 13 (downhole in operation) of the mandrel 12.
Housing 34 is slidably and concentrically fitted around the splined section 16 of the mandrel 12, and includes paired sets of splines 30 and 32 circumferentially spaced about the splined section 16.
The number, spacing, thickness and height of th~
splines 20, 22, 30 and 32 should be chosen such that the splines readily resist downhole torsional forces on the bent sub. The gaps 24 and 26 are respectively sufficiently wide for the adjacent set of splines 30 and 32 on splined end 36 of the housing 34 to pass through the gaps on rotation of the housing 34 in relation to the mandrel 12.
The housing 34 is divided into two ends that -~ 20~36 are rotatable with respect to each other from a locked position shown in Fig. 1 to an unlocked position shown in Fig. 2. Splined end 36 ir.cludes an uphole end that is threaded to define a threaded end 38. The housing 34 is bent at 40 an amount equal to half of the maximum total bend in the bent sub and mandrel combination. This maximum total bend is typically 2 degrees, hence the bend 40 in the housing 34 will be no more than 1 degree, with a minimum of 45 minutes for normal utility.
The angle or degree of bend of the housing is defined as follows. The threaded end 38 has a central axis 42, and the splined end 36 has a central axis 44.
The angle or degree of bend of the housing is the angle between the axes 42 and 44. Similarly, the angle or degree of the bend (at 50) in the mandrel will be no more than 1 degree, and the angle or degree of bend will be defined in like manner in relation to the axis 52 of the mandrel section 18 and the axis 54 of the splined section 16.
Threaded end 38 is threaded onto the thrust end 56 of the housing 34. In Fig. 1, the ends 38 and 56 are threaded together in locked position and in Fig. 2, the ends 38 and 56 are threaded together in unlocked position. Unthreading the thrust end 56 and the splined end 36 results in them moving longitudinally with respect to each other to allow the splined end 36 and the splined section 16 to be disengaged. ~hrust end 56 includes a shoulder 60 having a spherical surface and which abuts a back nut 62 threaded onto thrust section 39 of the mandrel 12.
The back nut 62 includes a spherical surface 64 which is complementary to the abutting spherical surface of the shoulder 60. A spherical sleeve 66 is provided ,. -, 20~036 between the abutting spherical surfaces 60 and 64.
Spring 70 is provided between shoulder 72 of the back nut 62 and the threaded end 38 of the housing 34.
Seals 74 seal off the interior of the housing 34 and mandrel 12. Surfaces 76 and 78 of the splined end 36 and the back nut 62 respectively are sliding surfaces.
The outside of the housing 34 and mandrel 12 is shown in Fig. 4. Sets of markings 80 and 82 provide reference points for determining the degree of bend of the bent sub, as described in more detail below.
Operation of Preferred Embodiments During drilling the thrust end 56 of the housing 34 is locked tightly onto the splined end 36 of the housing as shown in Fig. 1. Thrust forces are transmitted from the housing 34, which is connected to the mud motor (not shown), to the mandrel 12 through the shoulder 60, spherical sleeve 66 and back nut 62.
Rotational or torsional forces, if any, are transmitted through the interlocking splines 20, 22, 30 and 32. If the bends 40 and 50 are aligned so that they are opposite to each other, then they will cancel and the axis of the drill bit (not shown) will have the same crientation as the motor, hence also the drill string above the motor. This position will be ; referred to as the zero drilling angle.
If it is desired to change to a new angle of drilling, then the bent sub is backed out of the hole and the angle adjusted as follows. The thrust end 56 is unthreaded from the splined end 36 of the housing 34 while splined section 16 and splined end 36 remain stationary, and thrust end 36 is moved longitudinally ~with consequential rotation) to the unlocked position ~- 20~03~
shown in Fig. 2. The splined end 36 of the housing 34 may then be moved longitudinally of the splined section 16 of the mandrel to disengage the splines 20, 22, 30 and 32 also as shown in Fig. 2. The splined end 36 of the housing 34 may then be rotated in relation to the splined end 16 of the mandrel 12 to a new position having the desired angular offset. The unlocking procedure is then reversed to lock the splines. That is, the splined end 36 of the housing 34 may be moved longitudinally of the splined section 16 of the mandrel to engage the splines. The housing 34 may then be rotated in relation to the splined end 36 while keeping the mandrel fixed to lock the housing in position. If the bends 40 and 50 are each 1 degree, the bent sub was adjusted originally to be in the zero drilling position, and the housing 34 and mandrel 12 are rotated 180 degrees in relation to each other, then the new drilling angle will be offset 2 degrees from the zero drilling position. Intermediary d~illing angles may be obtained by lesser amounts of rotation, and the markings 80 and 82 may be used to calibrate the degree of rotation required to produce a desired drilling angle.
The markings 82 are required to establish a reference position for the position of the thrust end 56 of the housing 34 and the splined end 36 of the housing 34. That is, there are three sections that are rotatable with respect to each other between the bends 40 and 50, namely the thrust end 56 of the housing 34, the splined end 36 of the housing 34 and the splined section 16 of the mandrel 12. The markings are required between each section to establish an easy indication of the angular posikion of the bend 40 with respect to the bend 50.
204~03~
g In this manner, thrust forces may be directed downhole bypassing the splines.
Alternative Embodiments A person skilled in the art could make immaterial modifications to the invention described and claimed in this patent without departing from the essence of the invention.
...... _ This invention relates to apparatus used for directional drilling in earth formations.
BACRGROUND OF ~HE INV~NTION
A drilling system widely used in the oil and gas industry includes, in descending order at the end of a drill string, a mud motor, a bent sub, a bearing system and a drilling bit. This invention deals with the bent sub, the other components being standard in the industry.
The mud motor is powered by mud pumped into the drill string at the surface. The bent sub is used to connect the mud motor to the bearing system and to provide an offset angle for directional drilling. That is, the bent sub is bent so that the axis of the drill string at the drilling bit is offset from the angle of the drill string at the mud motor. The bent sub may be fixed or adjustable. The tool components described in this patent, such as the mandrel, housing and drive housing are all tubular or cylindrical and where an axis is referred to that axis means the line about which the tool component defines a solid of rotatio~.
Direction of drilling may be controlled with a fixed bent sub by using the technique referred to in United States patent no. 4,667,751 to Geczy et al. In that patent a technique is described in which the drill bit will drill straight when both the drill string and the motor are rotated, and the bit will deviate in a desired direction when only the motor is rotated and the drill string is kept stationary.
Direction of drilling may be accomplished with an adjustab:Le bent sub by using the technique described in United States patent no. 4,813,497 to Wenzel. In the Wenzel patent, the bent sub and :,, -:. , . ` :, -- 204S0~0 adjacent mandrel have a bent section each that are rotatable with respect to each other about the axis of the drill string, and the direction of drilling can be controlled by rotating the bent sections with respect to each other. If the bends of the bent sections are the same amount, say 1 degree, then the maximum bend is 2 degrees and the minimum is O degrees.
The Wenzel patent provides for the rotation of the bent sub between the bends by providing the bent sub in three sections, a locking nut, a sleeve and a sub housing. The sleeve and sub housing each include complementary mating ends each having a row of teeth that engage the teeth on the other mating end. The locking nut threads onto the mandrel and is backed off to allow the teeth on the end of the sleeve to clear the teeth of the sub housing for rotation of the sleeve with respect to the housing. The bent sub is connected on one end to the motor housing and on the other end to a mandrel. The two bends are provided in the mandrel and the sub housing.
This construction is disadvantageous in that the teeth transmit some of the downhole thrust forces and thus undergo considerable stress during drilling, with the consequence that they become susceptible to breaking.
SUMMARY OF THE IMVENTION
This invention provides, in one aspect, an adjustable bent sub comprising: a bent mandrel having a splined section; a bent housing having a thrust end and a distinct splined end and being rotatable in relation to the bent mandrel; the splined section of the mandrel being engagable and disengagable with the ~ . . . .
-. :. :. ~ : , : -- -`` 2 0 ~ 6 splined end of the housing; and the mandrel having means abutkable against the thrust end of the housing for transmitting thrust forces from the housing to the mandrel.
In another aspect the adjustable bent sub is further defined by the thrust end of the housing being movable longitudinally with respect to the splined end of the housing from a locked position in which the splined section of the mandrel is interlocked with the splined end of the housing to an unlocked position in which the splined section of the mandrel is disengagable from the splinded end of the housing.
In another aspect, the adjustable bent sub may include: a first shoulder on the mandrel; a second shoulder on the thrust end of the housing; and the first and second shoulders abutting each other for transmitting thrust forces, and further may include the mandrel including a back nut having an end and the first shoulder forming the end of the back nut.
BRIEF DE8CRIPTION OF THE DRaWINGS
There will now be described a preferred embodiment of the invention, with reference to the drawings, by way of illustration, in which like numerals denote like elements and in which: -Figure l is a cross-section of a bent sub according ~ ~ ;
to the invention, with splines in a first position;
Figure 2 is a cross-section of the bent sub of Fig.
1, with tha splines in a second position;
Figure 3 is a section along the line 3 - 3 in Fig.
1; and Figure 4 is a plan view of the bent sub and connecting mandrel of Fig. l.
20~36 _. 5 _ DESCR:I:PTION OF PR13~ERRED EMBODXMl~NT.
Physical Configuration Referring to Figs. 1, 2 and 3, there is shown a bent sub 10 made up of housing 34 and mandrel 12 according to the invention in two different operating positions. Fig. 1 shows interlocking splines in engaged position, as used during drilling, and Fig, 2 shows disengaged splines as used for changing the angle of drilling as defined by the bends 40 and 50 in the housing 34 (at 40) and mandrel 12 (at 50). Fig. 3 shows the interlocking splines in engaged position.
Mandrel 12 has a threaded section 14 having a first diameter, and a splined section 16 having a second diameter. Splines 20 and 22 are provided on the mandrel 12 in pairs longitudinally arranged on the splined section 16 and are circumferentially spaced about the splined section 16, with gaps 24 between them, and gaps 26 between the splines 22 and the wider part 13 (downhole in operation) of the mandrel 12.
Housing 34 is slidably and concentrically fitted around the splined section 16 of the mandrel 12, and includes paired sets of splines 30 and 32 circumferentially spaced about the splined section 16.
The number, spacing, thickness and height of th~
splines 20, 22, 30 and 32 should be chosen such that the splines readily resist downhole torsional forces on the bent sub. The gaps 24 and 26 are respectively sufficiently wide for the adjacent set of splines 30 and 32 on splined end 36 of the housing 34 to pass through the gaps on rotation of the housing 34 in relation to the mandrel 12.
The housing 34 is divided into two ends that -~ 20~36 are rotatable with respect to each other from a locked position shown in Fig. 1 to an unlocked position shown in Fig. 2. Splined end 36 ir.cludes an uphole end that is threaded to define a threaded end 38. The housing 34 is bent at 40 an amount equal to half of the maximum total bend in the bent sub and mandrel combination. This maximum total bend is typically 2 degrees, hence the bend 40 in the housing 34 will be no more than 1 degree, with a minimum of 45 minutes for normal utility.
The angle or degree of bend of the housing is defined as follows. The threaded end 38 has a central axis 42, and the splined end 36 has a central axis 44.
The angle or degree of bend of the housing is the angle between the axes 42 and 44. Similarly, the angle or degree of the bend (at 50) in the mandrel will be no more than 1 degree, and the angle or degree of bend will be defined in like manner in relation to the axis 52 of the mandrel section 18 and the axis 54 of the splined section 16.
Threaded end 38 is threaded onto the thrust end 56 of the housing 34. In Fig. 1, the ends 38 and 56 are threaded together in locked position and in Fig. 2, the ends 38 and 56 are threaded together in unlocked position. Unthreading the thrust end 56 and the splined end 36 results in them moving longitudinally with respect to each other to allow the splined end 36 and the splined section 16 to be disengaged. ~hrust end 56 includes a shoulder 60 having a spherical surface and which abuts a back nut 62 threaded onto thrust section 39 of the mandrel 12.
The back nut 62 includes a spherical surface 64 which is complementary to the abutting spherical surface of the shoulder 60. A spherical sleeve 66 is provided ,. -, 20~036 between the abutting spherical surfaces 60 and 64.
Spring 70 is provided between shoulder 72 of the back nut 62 and the threaded end 38 of the housing 34.
Seals 74 seal off the interior of the housing 34 and mandrel 12. Surfaces 76 and 78 of the splined end 36 and the back nut 62 respectively are sliding surfaces.
The outside of the housing 34 and mandrel 12 is shown in Fig. 4. Sets of markings 80 and 82 provide reference points for determining the degree of bend of the bent sub, as described in more detail below.
Operation of Preferred Embodiments During drilling the thrust end 56 of the housing 34 is locked tightly onto the splined end 36 of the housing as shown in Fig. 1. Thrust forces are transmitted from the housing 34, which is connected to the mud motor (not shown), to the mandrel 12 through the shoulder 60, spherical sleeve 66 and back nut 62.
Rotational or torsional forces, if any, are transmitted through the interlocking splines 20, 22, 30 and 32. If the bends 40 and 50 are aligned so that they are opposite to each other, then they will cancel and the axis of the drill bit (not shown) will have the same crientation as the motor, hence also the drill string above the motor. This position will be ; referred to as the zero drilling angle.
If it is desired to change to a new angle of drilling, then the bent sub is backed out of the hole and the angle adjusted as follows. The thrust end 56 is unthreaded from the splined end 36 of the housing 34 while splined section 16 and splined end 36 remain stationary, and thrust end 36 is moved longitudinally ~with consequential rotation) to the unlocked position ~- 20~03~
shown in Fig. 2. The splined end 36 of the housing 34 may then be moved longitudinally of the splined section 16 of the mandrel to disengage the splines 20, 22, 30 and 32 also as shown in Fig. 2. The splined end 36 of the housing 34 may then be rotated in relation to the splined end 16 of the mandrel 12 to a new position having the desired angular offset. The unlocking procedure is then reversed to lock the splines. That is, the splined end 36 of the housing 34 may be moved longitudinally of the splined section 16 of the mandrel to engage the splines. The housing 34 may then be rotated in relation to the splined end 36 while keeping the mandrel fixed to lock the housing in position. If the bends 40 and 50 are each 1 degree, the bent sub was adjusted originally to be in the zero drilling position, and the housing 34 and mandrel 12 are rotated 180 degrees in relation to each other, then the new drilling angle will be offset 2 degrees from the zero drilling position. Intermediary d~illing angles may be obtained by lesser amounts of rotation, and the markings 80 and 82 may be used to calibrate the degree of rotation required to produce a desired drilling angle.
The markings 82 are required to establish a reference position for the position of the thrust end 56 of the housing 34 and the splined end 36 of the housing 34. That is, there are three sections that are rotatable with respect to each other between the bends 40 and 50, namely the thrust end 56 of the housing 34, the splined end 36 of the housing 34 and the splined section 16 of the mandrel 12. The markings are required between each section to establish an easy indication of the angular posikion of the bend 40 with respect to the bend 50.
204~03~
g In this manner, thrust forces may be directed downhole bypassing the splines.
Alternative Embodiments A person skilled in the art could make immaterial modifications to the invention described and claimed in this patent without departing from the essence of the invention.
Claims (3)
1. An adjustable bent sub comprising:
a mandrel having a thrust section, a splined section and a threaded section, the splined and threaded sections defining first and second axes respectively, the axes being offset from each other and the splined section having mandrel splines;
a housing having a splined end and a thrust end, the splined and thrust ends defining third and fourth axes respectively, the axes being offset from each other and the splined end having drive splines, and the first and third axes coinciding;
the splined end and the thrust end of the housing being threaded together and movable longitudinally with respect to each other from a locked position to an unlocked position;
the splined end of the drive housing being complementary to, and slidably and concentrically disposed about, the splined section of the mandrel;
the drive splines being rotatable circumferentially in relation to the mandrel splines in a first position of the housing in relation to the mandrel and non-rotatable circumferentially in a second position, the first position corresponding to the locked position of the housing and the second position corresponding to the unlocked position of the housing; and means interconnecting the thrust end of the housing and the thrust section of the mandrel for transmitting substantially all downhole thrust forces from the thrust end of the housing to the thrust section of the mandrel.
a mandrel having a thrust section, a splined section and a threaded section, the splined and threaded sections defining first and second axes respectively, the axes being offset from each other and the splined section having mandrel splines;
a housing having a splined end and a thrust end, the splined and thrust ends defining third and fourth axes respectively, the axes being offset from each other and the splined end having drive splines, and the first and third axes coinciding;
the splined end and the thrust end of the housing being threaded together and movable longitudinally with respect to each other from a locked position to an unlocked position;
the splined end of the drive housing being complementary to, and slidably and concentrically disposed about, the splined section of the mandrel;
the drive splines being rotatable circumferentially in relation to the mandrel splines in a first position of the housing in relation to the mandrel and non-rotatable circumferentially in a second position, the first position corresponding to the locked position of the housing and the second position corresponding to the unlocked position of the housing; and means interconnecting the thrust end of the housing and the thrust section of the mandrel for transmitting substantially all downhole thrust forces from the thrust end of the housing to the thrust section of the mandrel.
2. The adjustable bent sub of claim 1 in which the means interconnecting the housing and the mandrel includes a first shoulder on the thrust section of the mandrel; and a second shoulder on the thrust end of the housing opposed to the first shoulder for transmitting thrust forces from the first shoulder to the second shoulder.
3. The adjustable bent sub of claim 8 comprising:
a back nut threaded onto the thrust section of the mandrel and having a third shoulder;
a spring on the back nut abutting against the third shoulder;
the splined end of the housing having a threaded end for threading onto the thrust end of the housing;
the thrust end of the housing having threads for receiving the threaded end of splined end;
a fourth shoulder on the splined end of the housing; and the splined end of the housing abutting against the spring, and the threaded end of the housing abutting against fourth shoulder when the adjustable bent sub is in the first position.
a back nut threaded onto the thrust section of the mandrel and having a third shoulder;
a spring on the back nut abutting against the third shoulder;
the splined end of the housing having a threaded end for threading onto the thrust end of the housing;
the thrust end of the housing having threads for receiving the threaded end of splined end;
a fourth shoulder on the splined end of the housing; and the splined end of the housing abutting against the spring, and the threaded end of the housing abutting against fourth shoulder when the adjustable bent sub is in the first position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55178590A | 1990-07-12 | 1990-07-12 | |
| US07/551,785 | 1990-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2045036A1 true CA2045036A1 (en) | 1992-01-13 |
Family
ID=24202676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2045036 Abandoned CA2045036A1 (en) | 1990-07-12 | 1991-06-20 | Adjustable bent sub |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2045036A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6550818B2 (en) | 2001-04-20 | 2003-04-22 | Cavare Ltd. | Bent sub assembly for directional drilling |
-
1991
- 1991-06-20 CA CA 2045036 patent/CA2045036A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6550818B2 (en) | 2001-04-20 | 2003-04-22 | Cavare Ltd. | Bent sub assembly for directional drilling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |