CN110295860B - Wellhead cleaning device for deep water jet drilling - Google Patents
Wellhead cleaning device for deep water jet drilling Download PDFInfo
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- CN110295860B CN110295860B CN201910643794.6A CN201910643794A CN110295860B CN 110295860 B CN110295860 B CN 110295860B CN 201910643794 A CN201910643794 A CN 201910643794A CN 110295860 B CN110295860 B CN 110295860B
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- 238000005553 drilling Methods 0.000 title claims abstract description 84
- 238000004140 cleaning Methods 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims abstract description 56
- 238000010408 sweeping Methods 0.000 claims abstract description 36
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000011435 rock Substances 0.000 abstract description 28
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 14
- 238000005520 cutting process Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- 241000191291 Abies alba Species 0.000 description 6
- 239000012634 fragment Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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
- E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
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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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
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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 discloses a wellhead cleaning device for deep water jet drilling, which relates to the field of offshore oil development and deep water drilling engineering, and comprises the following components: the base is provided with an axis, the base is provided with a through hole, the side wall of the through hole is provided with a positioning part which enables the base not to rotate along with the surface layer catheter, the upper end of the base is provided with a first extension part, and the circumference of the lower end of the base is provided with a second extension part; impeller mechanism, impeller mechanism includes: the impeller is sleeved on the base, the inner wall of the impeller is connected with a first gear, a cavity is formed between the inner wall of the impeller and the base, and blades are arranged on the surface of one side, facing the first extension part, of the impeller; the chip sweeping mechanism is connected to the side wall of the impeller in a hinged connection mode; and the motor is arranged in the cavity, a second gear is arranged on the shaft of the motor, and the second gear is in transmission connection with the first gear. According to the deep water jet drilling method and device, rock scraps generated in the drilling process can be prevented from being accumulated around the wellhead in the first drilling and second drilling and drilling processes of deep water jet drilling.
Description
Technical Field
The invention relates to the field of offshore oil development and deep water drilling engineering, in particular to a wellhead cleaning device for deep water jet drilling.
Background
The ocean energy development and utilization is an important measure for maintaining national ocean rights and interests and guaranteeing national energy safety, and has very profound strategic significance in the aspects of relieving the restrictions of resources and environment, expanding national economy and social development space and the like. In recent years, global significant oil and gas discovery mostly comes from deepwater areas, which are becoming the main growth point for offshore oil and an important field for sustainable development of the world oil industry.
As offshore oil development moves to deep sea areas, conventional subsurface conduit methods (drilling methods) cannot be adapted to the harmful effects of low subsurface soil strength, low fracture pressure gradient, unstable seabed, easy collapse of well walls and the like in deep sea areas. The surface layer conduit under the spraying method provides a new operation mode, and the sea water spraying drilling is adopted to realize the smooth falling of the surface layer conduit while protecting the marine ecological environment. Although the difficult problem of the lower surface layer conduit can be effectively overcome by adopting the operation mode, a large amount of rock fragments generated in the first drilling and second drilling processes are discharged from the wellhead return outlet and then accumulated around the wellhead, and the rock fragments cannot be effectively cleaned, so that potential safety hazards of burying the underwater wellhead and the underwater christmas tree in subsequent installation can be avoided. Therefore, there is a need to develop a wellhead cleaning device for deep water jet drilling to solve the problem of wellhead cuttings accumulation.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the invention is to provide the wellhead cleaning device for the deep water jet drilling, which can prevent rock scraps generated in the drilling process from accumulating around the wellhead in the first drilling and second drilling processes of the deep water jet drilling, and reduce the influence on the subsequent installation of the underwater wellhead and the underwater christmas tree.
The specific technical scheme of the embodiment of the invention is as follows:
a wellhead cleaning device for deep water jet drilling for sheathing on a surface conduit, the wellhead cleaning device comprising:
a base having an axis, the base having a through hole in an axis direction, a positioning portion provided on a side wall of the through hole so that the base does not rotate with the surface layer catheter, a first extending portion extending in a radial direction being provided in a circumference of an upper end of the base, and a second extending portion extending in the radial direction being provided in a circumference of a lower end of the base;
an impeller mechanism, the impeller mechanism comprising: the impeller is sleeved on the base, the impeller is positioned between the first extending part and the second extending part, a first gear is connected to the inner wall of the impeller, a cavity is formed between the inner wall of the impeller and the base, and blades are arranged on the surface of one side, facing the first extending part, of the impeller; the chip sweeping mechanism is connected to the side wall of the impeller in a hinged connection mode and extends along the radial direction;
and the motor is arranged in the cavity, a second gear is arranged on the shaft of the motor, and the second gear is in transmission connection with the first gear.
Preferably, the outer side wall of the surface layer catheter is provided with a groove extending along the axial direction, and the positioning part is a protruding part matched with the groove and extending along the axial direction.
Preferably, a positioning hole is formed in the outer side wall of the surface layer catheter, an opening is formed in the side wall of the through hole, a pin is arranged in the opening, and the pin can be embedded into the positioning hole, so that the base and the surface layer catheter are fixed.
Preferably, the plurality of blades are circumferentially distributed around the axis, and the blades and the impeller are connected through welding or integrally formed.
Preferably, the cross section of the blade is S-shaped in a tangential plane perpendicular to the radial direction.
Preferably, the chip sweeping mechanism is located at the lower edge of the impeller side wall.
Preferably, the motor is fixedly connected with the base.
Preferably, the cavity is sealed.
The technical scheme of the invention has the following remarkable beneficial effects:
the well head cleaning device cover of deep water jet drilling in this application is established and is installed on the top layer pipe, when the first time of drilling, the second time of drilling at deep water jet drilling, the well head cleaning device of deep water jet drilling is gone into along with the top layer pipe, when the surface pipe carries out the jet drilling under, the impeller rotates under the drive of motor, thereby make the blade rotation on the impeller, follow surface pipe upper end opening part exhaust detritus falls in the impeller top, the detritus produces centrifugal action under the effect of impeller blade, and then get rid of the well head region. A small amount of rock debris around the impeller which falls off partially sweeps off the surface of the second extension part under the rotation of the debris sweeping mechanism, and meanwhile, the debris sweeping mechanism directly sweeps off the rock debris which is close to the wellhead area so as to enable the rock debris to be far away from the wellhead area. The wellhead cleaning device for deep water jet drilling can effectively clean a large amount of rock debris generated or accumulated around the wellhead in the deep water jet drilling process, so that the safety of subsequent underwater wellhead installation and underwater christmas tree installation is ensured, the operation risk is effectively reduced, the marine environment is protected, and the economic benefit is increased.
Specific embodiments of the invention are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic perspective view of a wellhead cleaning device for deep water jet drilling in accordance with an embodiment of the present invention;
FIG. 2 is a front view of a wellhead cleaning device for deep water jet drilling sleeved on a surface conduit in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a wellhead cleaning device for deep water jet drilling sleeved on a surface conduit in accordance with an embodiment of the present invention;
FIG. 4 is a partial perspective view of a wellhead cleaning device for deep water jet drilling in accordance with an embodiment of the present invention.
Reference numerals of the above drawings:
1. a base; 11. a through hole; 12. a positioning part; 13. a first extension; 14. a second extension; 15. opening holes; 16. a pin; 2. an impeller mechanism; 21. an impeller; 22. a first gear; 23. a cavity; 24. a blade; 25. a chip sweeping mechanism; 251. a first rod body; 2511. a first through hole; 252. a second rod body; 2521. a second through hole; 26. a spring; 3. a motor; 31. a second gear; 4. a surface catheter; 41. a groove; 42. and positioning holes.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. However, the specific embodiments of the invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to avoid rock debris generated in the drilling process from accumulating around a wellhead during the first drilling and the second drilling of the deepwater jet drilling and reduce the influence on the subsequent installation of an underwater wellhead and an underwater christmas tree, the application proposes a wellhead cleaning device for deepwater jet drilling, wherein the wellhead cleaning device for deepwater jet drilling is used for being sleeved on a surface conduit, fig. 1 is a schematic perspective view of the wellhead cleaning device for deepwater jet drilling in the embodiment of the invention, fig. 2 is a front view of the wellhead cleaning device for deepwater jet drilling in the embodiment of the invention sleeved on the surface conduit, fig. 3 is a cross-sectional view of the wellhead cleaning device for deepwater jet drilling in the embodiment of the invention sleeved on the surface conduit, and fig. 4 is a partial perspective view of the wellhead cleaning device for deepwater jet drilling in the embodiment of the invention, as shown in fig. 1 to 4, the wellhead cleaning device for deepwater jet drilling may comprise: a base 1 having an axis, the base 1 having a through hole 11 in an axis direction, a positioning portion 12 provided on a side wall of the through hole 11 so that the base 1 does not rotate with the surface layer catheter 4, a first extending portion 13 extending in a radial direction being provided in a circumference of an upper end of the base 1, and a second extending portion 14 extending in the radial direction being provided in a circumference of a lower end of the base 1; impeller mechanism 2, impeller mechanism 2 includes: the impeller 21 is sleeved on the base 1, the impeller 21 is positioned between the first extension part 13 and the second extension part 14, a first gear 22 is connected to the inner wall of the impeller 21, a cavity 23 is formed between the inner wall of the impeller 21 and the base 1, and blades 24 are arranged on the surface of the impeller 21 facing one side of the first extension part 13; a chip-sweeping mechanism 25 extending in the radial direction and connected to the side wall of the impeller 21 by a hinge connection; the motor 3 is arranged in the cavity 23, and a second gear 31 is arranged on the shaft of the motor 3, and the second gear 31 is in transmission connection with the first gear 22.
The well head cleaning device cover of deep water jet drilling in this application is established and is installed on top layer pipe 4, when the first time of drilling in deep water jet drilling, the second time is drilled in the drilling process of drilling, the well head cleaning device of deep water jet drilling is gone into along with top layer pipe 4, when the surface pipe carries out jet drilling down, impeller 21 rotates under the drive of motor 3, thereby make impeller 21 on the blade 24 rotatory, follow surface pipe upper end opening part exhaust detritus and fall in impeller 21 top, under impeller 21 blade 24's effect detritus produces the centrifugal action, and then get rid of the well head region. A small amount of cuttings around the partially dropped impeller 21 are swept away from the surface of the second extension 14 by the rotation of the cuttings sweeping mechanism 25, while the cuttings sweeping mechanism 25 sweeps cuttings close to the wellhead area directly away from the wellhead area. The wellhead cleaning device for deep water jet drilling can effectively clean a large amount of rock debris generated or accumulated around the wellhead in the deep water jet drilling process, so that the safety of subsequent underwater wellhead installation and underwater christmas tree installation is ensured, the operation risk is effectively reduced, the marine environment is protected, and the economic benefit is increased.
In order to better understand the wellhead cleaning device of deep water jet drilling in the present application, it will be further explained and described below. As shown in fig. 3, the base 1 has an axis extending in a vertical direction, the base 1 has a through hole 11 in the axis direction, the through hole 11 is located in the middle of the base 1, and the through hole 11 is used for passing through the surface sleeve, and the size of the through hole is matched with that of the surface sleeve.
As shown in fig. 3, the circumference of the upper end of the base 1 has a first extension 13 extending in the radial direction, and the circumference of the lower end of the base 1 has a second extension 14 extending in the radial direction. The radius of the second extension 14 is larger than the radius of the first extension 13. The impeller mechanism 2 is arranged between the first extension part 13 and the second extension part 14, the first extension part 13 is used for propping against the upper end of the impeller mechanism 2, and limiting the upper part of the impeller mechanism 2; the second extension 14 is used for supporting the lower end of the impeller mechanism 2 and limiting the lower part of the impeller mechanism 2. The first extension 13 or the second extension 14 may be welded to the base 1, so that the impeller mechanism 2 may be conveniently installed and sleeved into the base 1.
As shown in fig. 1 and 3, the sidewall of the through hole 11 has a positioning portion 12 that makes the base 1 not rotate with the surface conduit 4, so that the base 1 and the surface conduit 4 can be kept relatively fixed when the motor 3 drives the impeller mechanism 2 to rotate. In a possible embodiment, the outer side wall of the surface catheter 4 may have a groove 41 extending in the axial direction, and the positioning portion 12 may be a protrusion extending in the axial direction that matches the groove 41. When the base 1 is fitted over the surface layer conduit 4, the protrusions on the side walls of the through holes 11 are fitted into the grooves 41 on the outer side walls of the surface layer conduit 4, so that the base 1 does not rotate with the surface layer conduit 4, while the base 1 can slide on the surface layer conduit 4 in the axial direction.
In a possible embodiment, as shown in fig. 3, the outer side wall of the surface catheter 4 is provided with a positioning hole 42, the side wall of the through hole 11 is provided with an opening 15, the opening 15 is provided with a pin 16, and the pin 16 can be embedded into the positioning hole 42, so that the base 1 and the surface catheter 4 are fixed. The wellhead cleaning device of the deepwater jet drilling has at least two states, and in the first state, the base 1 of the wellhead cleaning device of the deepwater jet drilling is kept fixed with the surface conduit 4 through the pin 16; in the second state, the pin 16 is cut off and the wellhead cleaning device of the deepwater jet drilling is able to slide in the axial direction with the surface conduit 4.
As shown in fig. 1 to 3, the impeller mechanism 2 may include: the impeller 21 and a chip-sweeping mechanism 25 extending in the radial direction and connected to the side wall of the impeller 21 by a hinge connection. Wherein, impeller 21 is overlapped on base 1, and impeller 21 is located between first extension 13 and second extension 14. An annular cavity 23 is provided between the inner wall of the impeller 21 and the base 1, the annular cavity 23 being sealed from the environment to avoid ingress of water therein in deep water.
As shown in fig. 4, a first gear 22 is connected to the inner wall of the impeller 21, and the first gear 22 is distributed in the circumferential direction of the inner wall of the impeller 21. The motor 3 is arranged in the cavity 23, and a second gear 31 is arranged on the shaft of the motor 3, and the second gear 31 is in driving connection with the first gear 22. For example, the second gear 31 is directly engaged with the first gear 22. When the motor 3 rotates, the second gear 31 on the motor 3 directly drives the first gear 22 to rotate, and the first gear 22 is arranged on the inner wall of the impeller 21, so that the impeller 21 is driven to rotate. In order for the motor 3 to generate driving force to drive the first gear 22 to rotate, the motor 3 needs to be fixedly connected with the base 1, so that the motor 3 and the base 1 can be kept relatively fixed when the impeller 21 rotates.
As shown in fig. 3, the surface of the impeller 21 facing the side of the first extension 13 gradually decreases in height outward in the radial direction, having an inclined surface of a certain angle. The surface of the impeller 21 facing the side of the first extension 13 is provided with a plurality of blades 24, which may be circumferentially distributed around the axis, the blades 24 being connected to the impeller 21 by welding or the blades 24 being integrally formed with the impeller 21. In one possible embodiment, the blades 24 are S-shaped in cross section in a tangential plane perpendicular to the radial direction in order to enable the blades 24 to drive the radially outward flow of water under rotation of the impeller 21, thereby centrifuging the falling cuttings away from the wellhead area.
As shown in fig. 1 to 3, the chip-sweeping mechanism 25 is connected to the side wall of the impeller 21 by a hinge connection, and the chip-sweeping mechanism 25 extends outwardly in a generally radial direction. Most of the rock fragments discharged from the upper end opening of the surface guide pipe can be far away from the wellhead area under the action of the blades 24, but a small amount of rock fragments still fall near the wellhead or above the second extension part 14, at this time, the impeller 21 can drive the chip sweeping mechanism 25 to rotate when rotating, and under the rotation of the chip sweeping mechanism 25, the chip sweeping mechanism can sweep the rock fragments on the surface of the second extension part 14, and meanwhile, the chip sweeping mechanism 25 directly sweeps the rock fragments close to the wellhead area away from the wellhead area. In order to provide the effect of the chip-sweeping mechanism 25 cleaning the surface of the second extension 14, it is preferable that the chip-sweeping mechanism 25 is located at the lower edge of the side wall of the impeller 21.
In order to change the radius range of the deepwater jet drilling wellhead cleaning device for cleaning the debris near the wellhead, and further meet the requirements of different rock debris amounts, the debris sweeping mechanism 25 needs to be telescopic in the radial direction. In a possible embodiment, the chip sweeping mechanism 25 includes a first rod 251 and a second rod 252, the first rod 251 has a chute, the second rod 252 is inserted into the chute and can slide in the chute, the first rod 251 is provided with a first through hole 2511, the second rod 252 is provided with a plurality of second through holes 2521 along the sliding direction, and locking elements are inserted into the first through hole 2511 and the second through holes 2521 to fix the first rod 251 and the second rod 252. When the radius of the debris near the wellhead needs to be increased, the second rod 252 is pulled out from the first rod 251 by a certain distance, the first through hole 2511 on the first rod 251 is opposite to a certain second through hole 2521 of the second rod 252, and then the locking element is inserted, so that the first rod 251 and the second rod 252 are fixed.
In a preferred embodiment, the chip-sweeping mechanism 25 is connected to the impeller 21 by a hinge mechanism to effect a hinged connection. As shown in fig. 1, a spring 26 is arranged between the scrap sweeping mechanism 25 and the hinge, one end of the scrap sweeping mechanism 25, which is close to the impeller 21, is connected with one end of the spring 26, and the other end of the spring 26 is connected to the hinge mechanism or the impeller 21, so that the scrap sweeping mechanism 25 can swing back and forth under the action of the spring 26. Under the initial condition, sweep the degree that chip mechanism 25 outwards stretches out is biggest, in this structure, if impeller 21 rotates, sweep chip mechanism 25 and meet that big rock chip appears the resistance great or can't clear away it, sweep chip mechanism 25 and can take place to rotate along impeller 21 pivoted opposite direction under spring 26 and rock chip resistance's effect, the degree that its outwards stretches out reduces, sweeps the chip radius and reduces, so sweep chip mechanism 25's resistance just can become small or just can be through the big rock chip department that can't clear away. Then, under the urging force of the spring 26, the chip-sweeping mechanism 25 can be rotated in the direction in which the impeller 21 rotates, and is restored to the original state position, that is, the extent of outward extension is increased, that is, the chip-sweeping radius is increased. Through the process, the whole scrap sweeping mechanism 25 can be guaranteed not to be damaged when encountering large rock scraps which cannot be cleaned out.
The using process of the wellhead cleaning device for deep water jet drilling in the application is as follows: when the deep water jet drilling wellhead cleaning device is just used, the deep water jet drilling wellhead cleaning device is sleeved on the surface layer conduit 4, the positioning part 12 on the side wall of the through hole 11 of the base 1 can be a protruding part, and the positioning part is embedded into the groove 41 on the outer side wall of the surface layer conduit 4, so that the deep water jet drilling wellhead cleaning device is prevented from sliding circumferentially when the surface layer conduit 4 goes into deep water. The lower surface of the second extension 14 of the base 1 may be substantially in a plane with the lowermost end of the surface conduit 4, the locating hole 42 of the surface conduit 4 being fixed by the pins 16 mounted in the apertures 15 provided in the side walls of the through-going hole 11 of the base 1, thereby preventing axial sliding of the wellhead cleaning device of the deepwater jet drilling during the lowering of the surface conduit 4 into the deepwater.
During the first drilling operation, the well head cleaning device of the deep water jet drilling well enters along with the surface conduit 4, when the lower surface of the base 1 contacts the mud surface, the well head cleaning device cannot enter continuously due to the blocking of the mud surface, the surface conduit 4 continues to jet drill into the mud surface, and at this time, the pin 16 for fixing the base 1 and the surface conduit 4 is sheared, so that the surface conduit 4 can be smoothly lowered. From the start of jet drilling, the impeller 21 is rotated by the motor 3 inside the impeller, and the blades 24 on the impeller 21 rotate to drive the water to flow radially outwards. Cuttings from jet drilling are discharged from the upper end opening of the surface conduit 4 and drop downwardly adjacent the wellhead, including above the impeller 21. The cuttings are centrifuged by the blades 24 of the impeller 21, which in turn causes the cuttings to be thrown away from the wellhead area. Meanwhile, the scrap sweeping mechanism 25 positioned at the lower edge of the impeller 21 is firstly adjusted to a proper extension length according to the size of the rock scraps so as to adjust the scrap sweeping radius of the device, the rotation of the impeller 21 drives the auxiliary scrap sweeping mechanism to sweep away a small amount of the rock scraps around the impeller 21, which partially fall down, from the surface of the second extension part 14 under the rotation of the scrap sweeping mechanism 25, and meanwhile, the scrap sweeping mechanism 25 directly sweeps away the rock scraps close to the wellhead area so as to be far away from the wellhead area.
During the second drilling operation, the wellhead cleaning device for deep water jet drilling is arranged on the mud surface, and the impeller 21 keeps rotating stably under the drive of the motor 3, so that the chip sweeping operation is continuously performed, and the rock chips which are generated in the jet drilling process of the second drilling operation and are close to the wellhead area are swept away from the wellhead area. During the whole jet drilling process of the first drill-out operation and the second drill-out operation, most of the returned rock debris falls on the surface of the impeller 21, the surface of the blade 24 or the periphery of the base 1, and the rock debris generates centrifugal motion under the rotation action of the blade 24 and the debris sweeping mechanism 25, so that the rock debris is thrown away from the wellhead area.
The wellhead cleaning device for deep water jet drilling can effectively clean a large amount of rock debris which is generated in the deep water jet drilling process and is accumulated around a wellhead, and the rock debris is swept away from the vicinity of the wellhead, so that the follow-up safe operation of installing an underwater wellhead and an underwater christmas tree at the wellhead is ensured, the operation risk is effectively reduced, the marine environment is protected, and the economic benefit is increased.
All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional. Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (6)
1. A wellhead cleaning device for deep water jet drilling, the wellhead cleaning device for deep water jet drilling being adapted to be sleeved on a surface conduit, the wellhead cleaning device for deep water jet drilling comprising:
a base with an axis, wherein the base is provided with a through hole along the axis direction, a positioning part which enables the base not to rotate relative to the surface layer catheter is arranged on the side wall of the through hole, a first extension part which extends along the radial direction is arranged at the circumference of the upper end of the base, and a second extension part which extends along the radial direction is arranged at the circumference of the lower end of the base;
an impeller mechanism, the impeller mechanism comprising: the impeller is sleeved on the base, the impeller is positioned between the first extending part and the second extending part, a first gear is connected to the inner wall of the impeller, a cavity is formed between the inner wall of the impeller and the base, and blades are arranged on the surface of one side, facing the first extending part, of the impeller; the chip sweeping mechanism is connected to the side wall of the impeller in a hinged connection mode and extends along the radial direction;
the motor is arranged in the cavity, a second gear is arranged on the shaft of the motor, and the second gear is in transmission connection with the first gear; the motor is fixedly connected with the base; the cavity is sealed.
2. The wellhead cleaning device for deep water jet drilling according to claim 1, wherein the outer side wall of the surface conduit is provided with a groove extending along the axial direction, and the positioning part is a protruding part matched with the groove and extending along the axial direction.
3. The wellhead cleaning device for deep water jet drilling according to claim 1, wherein a positioning hole is formed in the outer side wall of the surface conduit, an opening is formed in the side wall of the through hole, a pin is arranged in the opening, and the pin can be embedded into the positioning hole, so that the base and the surface conduit are fixed.
4. The wellhead cleaning device of deepwater jet drilling according to claim 1, wherein the plurality of blades are circumferentially distributed about an axis, and the blades are welded to the impeller or integrally formed with the impeller.
5. The wellhead cleaning device of deepwater jet drilling according to claim 4, wherein the blades are S-shaped in cross section in a section perpendicular to the radial direction.
6. The wellhead cleaning device of deepwater jet drilling of claim 1, wherein the chip-sweeping mechanism is located at a lower edge of the impeller sidewall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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