CN108915619B - A concentric tube cuttings suction and crushing device suitable for dual gradient drilling - Google Patents
A concentric tube cuttings suction and crushing device suitable for dual gradient drilling Download PDFInfo
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- CN108915619B CN108915619B CN201810734762.2A CN201810734762A CN108915619B CN 108915619 B CN108915619 B CN 108915619B CN 201810734762 A CN201810734762 A CN 201810734762A CN 108915619 B CN108915619 B CN 108915619B
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- 238000005553 drilling Methods 0.000 title claims abstract description 309
- 238000005520 cutting process Methods 0.000 title claims abstract description 23
- 230000009977 dual effect Effects 0.000 title claims description 21
- 239000012530 fluid Substances 0.000 claims abstract description 185
- 238000004891 communication Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 description 79
- 239000002245 particle Substances 0.000 description 23
- 230000009471 action Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
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Abstract
本发明为一种适用于双梯度钻井的同心管岩屑抽吸破碎装置，该装置内设置有轴向两端开口的钻井液流入通道，钻井液流入通道分流连通有钻井液返排通道，钻井液返排通道的入口端位于装置内，钻井液返排通道的出口端设置破碎部，钻井液返排通道上设置第一射流喉部和第二射流喉部，钻井液返排通道位于第一射流喉部和第二射流喉部之间的位置构成混合腔，该装置内还设置有能连通装置外部和混合腔的环空钻井液上返通道，环空钻井液上返通道与钻井液流入通道呈周向间隔设置。该适用于双梯度钻井的同心管岩屑抽吸破碎装置便于水平井岩屑携带，减少岩屑床的产生，降低钻井成本，为安全高效钻井提供保证。
The invention is a concentric pipe cuttings suction and crushing device suitable for double gradient drilling. The device is provided with a drilling fluid inflow channel with openings at both ends in the axial direction. The drilling fluid inflow channel is divided and communicated with a drilling fluid return channel. The inlet end of the fluid flowback channel is located in the device, the outlet end of the drilling fluid flowback channel is provided with a crushing part, the drilling fluid flowback channel is provided with a first jet throat and a second jet throat, and the drilling fluid flowback channel is located in the first The position between the jet throat and the second jet throat constitutes a mixing cavity. The device is also provided with an annular drilling fluid upward return channel that can communicate with the outside of the device and the mixing cavity. The annular drilling fluid upward return channel and the drilling fluid flow into the device. The channels are arranged at circumferential intervals. The concentric tube cuttings suction and crushing device suitable for double gradient drilling is convenient for carrying cuttings in horizontal wells, reduces the generation of cuttings beds, reduces drilling costs, and provides a guarantee for safe and efficient drilling.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a concentric tube rock debris suction crushing device suitable for double-gradient drilling.
Background
With the continuous and complicated oil and gas exploration conditions, the drilling is more and more complicated. Although the refined pressure control drilling technology solves part of problems, the problem of a multi-pressure system in the same open hole section cannot be met. The concentric tube drilling is a double-gradient drilling technology capable of accurately controlling the bottom hole pressure, can realize the closed-loop circulation of drilling fluid, and can solve a plurality of limitations of the conventional drilling technology. In addition, the RTS system in concentric pipe drilling can provide a power and data transmission channel for underground by using a double-wall drill pipe, and wired transmission of data is realized, so that the RTS system has more advantages in measurement while drilling/logging while drilling compared with the common MWD/LWD.
The concentric tube drilling technology has many advantages, but in the horizontal well drilling process, drilling fluid carrying rock debris needs to enter an inner drill rod from an annular space through a special passage, and in the process, the rock debris is easy to stay in the annular space and gradually accumulated to form a rock debris bed. The well cleaning degree is directly related to the success or failure of one well, and the drilling accident is sometimes caused by poor cleaning, so that the problem seriously influences the further development and popularization of the concentric tube drilling technology.
The existence of the detritus bed brings a plurality of potential safety hazards to drilling construction, seriously threatens the drilling safety, and is mainly embodied in the following aspects:
(1) the detritus bed is easy to cause the drilling tool to generate high friction resistance and high torque, and even the drilling tool is twisted off; (2) the cuttings bed causes a reduction in the rate of penetration. Due to the loose arrangement structure among the detritus particles of the detritus bed, a key groove is easy to form to cause support pressure, so that the drill pressure cannot be completely acted on a drill bit, the lifting and lowering resistance of the drilling tool is increased, and the drilling efficiency is reduced; (3) the cuttings bed is easy to cause accidents such as drill jamming and the like, so that the project progress is slow, and the drilling period is prolonged; (4) the debris bed can cause the problems of difficult well logging tool entry, difficult casing and well cementation, poor well cementation quality and the like; (5) because the drilling tool is not centered in the horizontal well section, the rock debris is repeatedly crushed into finer particles by the drilling tool, the solid content of the annular drilling fluid is increased, meanwhile, the annular space is reduced, an oval well hole is formed, and the pump is easily suppressed.
Some rock debris and a rock debris bed cleaning method are proposed in the prior art, and although some effects are obtained in use, some defects exist at the same time, such as: (1) increasing the discharge capacity of the drilling fluid and increasing the upward return speed of the annulus: the method can bring certain damage to the reservoir, and meanwhile, due to the fact that the upward return speed is too high, the upper soft stratum is easy to collapse and fall; (2) the performance of the drilling fluid is improved, and the chip carrying capacity of the drilling fluid is improved: the drilling fluid is difficult to adjust to the degree of not sinking the rock debris under the current conditions, and other methods for cleaning the rock debris must be matched at the same time, and in addition, the problem of overhigh drilling cost is caused by the large investment of designing and applying special drilling fluid; (3) short lifting down and back reaming and rock debris clearing bed: when the method is implemented, the drilling needs to be stopped and the drill string needs to be lifted, the cost is increased when the drilling is consumed, and a high-quality well cannot be drilled; (4) adopt screw-tupe well cleaning means, it is rotatory to utilize the drilling string rotation to drive the instrument to stir the detritus bed, increase drilling fluid and carry bits efficiency: although the rock carrying efficiency of the drilling fluid can be improved, the action length of the tool is limited, and the rock carrying efficiency of the whole horizontal section cannot be improved; (5) adopt and follow the drilling segmentation well-flushing device, when forming the detritus bed at the horizontal segment, stop the well drilling, divide into several sections with the horizontal segment, then wash alone to each section, improve the cleaning efficiency: the method can completely clean the whole horizontal section of the detritus bed, but the drilling needs to be stopped, the drilling speed is reduced, and other problems can be caused by stopping the pump.
Therefore, the inventor provides a concentric pipe rock debris suction crushing device suitable for double-gradient drilling by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, which solves the problems of complex operation, time consumption in drilling stoppage, high cost, poor safety and the like in the prior art.
The invention aims to achieve the aim, and the embodiment of the invention provides a concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, wherein a drilling fluid inflow channel with two open ends in the axial direction is arranged in the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, the drilling fluid inflow channel is communicated with a drilling fluid return channel in a shunting manner, the inlet end of the drilling fluid return channel is positioned in the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, the outlet end of the drilling fluid return channel is provided with a crushing part, a first jet throat part and a second jet throat part are axially arranged on the drilling fluid return channel at intervals, the drilling fluid return channel is positioned between the first jet throat part and the second jet throat part to form a mixing cavity, and an annular drilling fluid upper return channel capable of communicating the outside of the device with the mixing cavity is also arranged in the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, the annular drilling fluid upward-returning channel and the drilling fluid inflow channel are arranged at intervals in the circumferential direction.
In a preferred embodiment of the present invention, the concentric tube debris suction and crushing device suitable for dual gradient drilling is formed by hermetically connecting a flow channel adapter and a first adapter, wherein the flow channel adapter is provided with the drilling fluid inflow channel and the annular drilling fluid return channel, one end of the drilling fluid return channel, which is communicated with the drilling fluid inflow channel, is located in the flow channel adapter, an outlet end of the drilling fluid return channel is located in the first adapter, the first adapter is provided with a first adapter return cavity, which is communicated with the outlet end of the drilling fluid return channel, and an outlet end of the first adapter return cavity is open.
In a preferred embodiment of the invention, a communication bend capable of communicating the drilling fluid backflow passage with the drilling fluid inflow passage is arranged in the concentric pipe rock debris suction and crushing device suitable for double-gradient drilling; the communication bend and the annular drilling fluid upward return channel are arranged at intervals in the circumferential direction, the annular drilling fluid upward return channel is far away from one end, communicated with the outside of the device, of the annular drilling fluid upward return channel, and the other end, communicated with the mixing cavity, of the annular drilling fluid upward return channel is close to the first joint.
In a preferred embodiment of the present invention, the crushing portion is formed by a crushing pipe, an inlet end of the crushing pipe is communicated with an outlet end of the drilling fluid return passage, a first included angle is formed between the crushing pipe and an axial direction of the drilling fluid return passage, and an outlet end of the crushing pipe is communicated with the first joint return chamber.
In a preferred embodiment of the present invention, the inlet end of the first joint return cavity is provided with a conical surface, the diameter of the conical surface is gradually enlarged from the inlet end of the first joint return cavity to the outlet end of the first joint return cavity, and one side of the crushing tube abuts against and is supported on the conical surface; the drilling fluid backflow channel is formed by a first straight pipe which is hermetically inserted into the flow channel conversion joint and the first joint, the first jet flow throat part and the second jet flow throat part are arranged in the first straight pipe, and the outlet end of the first straight pipe is hermetically communicated with the inlet end of the crushing pipe.
From the above, the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling provided by the invention has the following beneficial effects:
(1) the concentric tube rock debris suction and crushing device suitable for the dual-gradient drilling can realize reverse jet of high-speed fluid, and the mixing cavity forms a low-pressure area under the action of the first jet throat part, so that drilling fluid containing rock debris in the external annular space can be quickly sucked, and the probability of formation of a rock debris bed is reduced;
(2) in the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, under the action of the second jet throat part, the drilling fluid containing rock debris in the mixing cavity is jetted to the crushing part at a high speed, the rock debris is crushed for the second time by utilizing the high-speed jet of the drilling fluid and the crushing part, large-particle rock debris is crushed into small-particle rock debris, the particle size of rock debris particles is more uniform, and the rock debris is more easily carried and returned;
(3) when the concentric tube drilling device of the concentric tube rock debris suction crushing device suitable for the dual-gradient drilling is used for sucking rock debris, the drilling does not need to be stopped, the discharge capacity does not need to be increased, and special drilling fluid does not need to be used, so that the drilling efficiency of a horizontal well is effectively improved, the probability of drilling accidents is reduced, the guarantee is provided for safe and efficient drilling, the drilling time is shortened, the drilling cost is reduced, and the development prospect is wide.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1: is a top view of the concentric tube cuttings suction breaker of the present invention adapted for use in dual gradient drilling.
FIG. 2: is a cross-sectional view a-a in fig. 1.
FIG. 3: is a cross-sectional view B-B in FIG. 1.
FIG. 4: the concentric tube drilling device is a cross section of a drilling fluid inflow channel by using the concentric tube rock debris suction breaking device suitable for double-gradient drilling.
FIG. 5: the invention relates to a cross section of a concentric tube drilling device at an annulus drilling fluid return passage, which is suitable for a concentric tube rock debris suction crushing device for double-gradient drilling.
In the figure:
100. the concentric tube rock debris suction crushing device is suitable for double-gradient drilling;
200. a concentric tube drilling device;
1. a flow channel crossover sub; 11. an inner groove;
2. a first joint;
21. a first joint return chamber;
22. a conical surface;
30. a drilling fluid flow-through cavity;
31. a drilling fluid inflow channel;
32. a drilling fluid return passage;
33. a crushing section;
34. an annulus drilling fluid upward return channel;
35. communicating the curved channel;
41. a first jet throat;
42. a second jet throat;
5. a mixing chamber;
91. a concentric drill rod structure;
911. an inner drill rod;
9111. an inner drill rod joint; 9112. an upper inner drill rod;
912. an outer drill rod;
9121. an upper outer drill rod;
913. injecting drilling fluid into the space;
914. a return space;
92. an end drilling tool;
921. an end drill flow passage.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the upstream end shown in fig. 2 is set as a first end, and the downstream end shown in fig. 2 is set as a second end, the present invention provides a concentric tube rock debris suction breaking device 100 suitable for dual gradient drilling, a drilling fluid inflow channel 31 with two open ends in the axial direction is arranged in the concentric tube rock debris suction breaking device 100 suitable for dual gradient drilling, the first end of the concentric tube rock debris suction breaking device 100 suitable for dual gradient drilling is provided with an inlet end of the drilling fluid inflow channel 31, and the second end of the concentric tube rock debris suction breaking device 100 suitable for dual gradient drilling is provided with an outlet end of the drilling fluid inflow channel 31; the drilling fluid inflow channel 31 is in split communication with a drilling fluid return channel 32, the inlet end of the drilling fluid return channel 32 is positioned in the concentric tube rock debris suction crushing device 100 suitable for dual-gradient drilling, the outlet end of the drilling fluid return channel 32 is arranged at the first end of the concentric tube rock debris suction crushing device 100 suitable for dual-gradient drilling in an open manner, the flow direction of the drilling fluid in the drilling fluid return channel 32 is opposite to the flow direction of the drilling fluid in the drilling fluid inflow channel 31, and the return flow of the drilling fluid is realized; the outlet end of drilling fluid flowback passageway 32 sets up crushing portion 33, drilling fluid flowback passageway 32 is last to set up first efflux throat 41 and second efflux throat 42 along axial interval, drilling fluid flowback passageway 32 is located the position between first efflux throat 41 and the second efflux throat 42 and constitutes mixing chamber 5, still be provided with the annular space drilling fluid that can the intercommunication device outside and mixing chamber 5 in being applicable to the concentric tube detritus suction breaker 100 of two gradient drilling and go up the passageway 34 that returns, the annular space drilling fluid goes up the passageway 34 and is the circumference interval setting with drilling fluid inflow channel 31.
The concentric tube rock debris suction and crushing device 100 suitable for dual-gradient drilling can realize reverse jet of high-speed fluid, and under the action of the throat part of the first jet, the mixing cavity forms a low-pressure area, so that drilling fluid containing rock debris in the external annular space can be quickly sucked, and the probability of formation of a rock debris bed is reduced; under the action of the second jet throat part, the drilling fluid containing the rock debris in the mixing cavity is shot to the crushing part at a high speed, the rock debris is secondarily crushed by the high-speed jet of the drilling fluid and the crushing part, large-particle rock debris is crushed into small-particle rock debris, the particle size of rock debris particles is more uniform, and the rock debris is more easily carried and discharged; when the concentric tube rock debris suction crushing device 100 suitable for dual-gradient drilling is used for sucking rock debris, the drilling does not need to be stopped, the discharge capacity does not need to be increased, and special drilling fluid does not need to be used, so that the drilling efficiency of a horizontal well is effectively improved, the probability of drilling accidents is reduced, a guarantee is provided for safe and efficient drilling, the drilling time is shortened, the drilling cost is reduced, and the development prospect is wide.
Further, as shown in fig. 1, 2 and 3, the concentric pipe debris suction breaking device 100 suitable for dual gradient drilling is formed by hermetically connecting a flow channel adapter 1 and a first adapter 2, in a specific embodiment of the present invention, one end of the flow channel adapter 1 is provided with an inner groove 11, the end surface of the other end of the first adapter 2 is hermetically abutted against the groove bottom surface of the inner groove 11, and the side wall of the other end of the first adapter 2 is hermetically connected to the side wall of the inner groove 11. The drilling fluid inflow channel 31 and the annular drilling fluid upward return channel 34 are arranged in the flow channel adapter 1, one end, communicated with the drilling fluid inflow channel 31, of the drilling fluid return channel 32 is located in the flow channel adapter 1, the outlet end of the drilling fluid return channel 32 is located in the first connector 2, the first connector return cavity 21 communicated with the outlet end of the drilling fluid return channel 32 is arranged in the first connector 2, and the outlet end of the first connector return cavity 21 is arranged in an open mode. The concentric tube cuttings suction breaker 100 adapted for dual gradient drilling may also be a unitary structure.
Further, as shown in fig. 2 and 3, in order to realize the split communication between the drilling fluid inflow channel 31 and the drilling fluid return channel 32, a communication bend 35 capable of communicating the drilling fluid return channel 32 with the drilling fluid inflow channel 31 is arranged in the concentric tube rock debris suction breaking device 100 suitable for dual gradient drilling; the communication curved channel 35 and the annular drilling fluid upward-returning channel 34 are circumferentially arranged at intervals, in order to ensure smooth flow distribution, a first end of the communication curved channel 35 is obliquely arranged inwards and downwards (in the direction in fig. 2), a second end of the communication curved channel 35 is obliquely arranged outwards and downwards (in the direction in fig. 2), and two ends of the communication curved channel 35 are communicated through arc-shaped curved channels. The one end that returns passageway 34 and device outside intercommunication on the annular drilling fluid is kept away from first joint 2 and is set up, and the other end that returns passageway 34 and mixing chamber 5 intercommunication on the annular drilling fluid is close to first joint 2 and sets up, returns passageway 34 slant in and upwards (as the slant that shows in figure 1 in the slant and the slant direction) slope setting on the annular drilling fluid promptly, and this setting direction makes the drilling fluid that contains the detritus of outside annular more easily flow back.
Further, broken portion 33 comprises broken pipe, and the entry end of broken pipe and the exit end intercommunication setting of drilling fluid flowback passageway 32 constitute first contained angle between broken pipe and the drilling fluid flowback passageway 32's the axial, for guaranteeing the detritus crushing effect, first contained angle more than or equal to 30 sets up. The outlet end of the crushing pipe is communicated with the first joint return cavity 21.
In an embodiment of the present invention, as shown in fig. 2 and fig. 3, the inlet end of the first joint return cavity 21 (located at the outlet end of the drilling fluid return channel) is provided with a conical surface 22, the diameter of the conical surface 22 is gradually enlarged from the inlet end of the first joint return cavity 21 (the outlet end of the drilling fluid return channel) to the outlet end of the first joint return cavity 21, and one side of the crushing tube is supported against the conical surface 22; the drilling fluid backflow channel 32 is formed by a first straight pipe which is inserted in the flow channel adapter 1 and the first connector 2 in a sealing mode, pore channels used for penetrating the first straight pipe are formed in the flow channel adapter 1 and the first connector 2, and the outer wall of the first straight pipe and the inner wall of each pore channel are sealed through a sealing ring; the first jet throat 41 and the second jet throat 42 are arranged in a first straight pipe, and the outlet end of the first straight pipe is in sealed communication with the inlet end of the crushing pipe. The drilling fluid return passage 32 can also be formed by a flow passage hole which is hermetically communicated in the flow passage conversion joint 1 and the first joint 2. In a specific embodiment of the present invention, the drilling fluid inflow channel 31, the communicating curved channel 35, the drilling fluid return channel 32, and the annular drilling fluid return channel 34 are formed by casting, and the first joint return cavity 21 may be formed by direct casting or by machining.
Further, the crushing portion 33 can also be formed by a conical plate protruding from the conical top to the outlet end of the drilling fluid return passage 32, the diameter of the conical plate is gradually enlarged from the inlet end of the first joint return chamber 21 (the outlet end of the drilling fluid return passage) to the outlet end of the first joint return chamber 21, rock debris carried by the drilling fluid collides against the conical plate at a high speed, large-particle rock debris is crushed into small-particle rock debris, and the particle size of rock debris particles is more uniform and easier to discharge.
As shown in fig. 4 and 5, the present invention further provides a concentric tube drilling apparatus 200, comprising the aforementioned concentric tube debris suction breaking apparatus 100 suitable for dual gradient drilling, the concentric tube drilling apparatus 200 further comprising a concentric drill rod structure 91 (prior art) and an end drilling tool 92 (prior art), the concentric tube debris suction breaking apparatus 100 suitable for dual gradient drilling being hermetically connected between the concentric drill rod structure 91 (prior art) and the end drilling tool 92 (prior art); the concentric drill rod structure 91 comprises an inner drill rod 911 and an outer drill rod 912 which are coaxially arranged, a drilling fluid injection space 913 is formed by the outer wall of the inner drill rod 911 and the inner wall of the outer drill rod 912 at intervals, and a backflow space 914 is formed by the inner cavity of the inner drill rod; the inlet end of the drilling fluid inflow channel 31 is arranged in communication with the drilling fluid injection space 913, and the outlet end of the drilling fluid return channel 32 is arranged in communication with the return space 914. The axial through holes in the end drill 92 form an end drill flow path 921 (prior art) through which drilling fluid can flow into the well to complete drilling operations and carry cuttings back.
In an embodiment of the present invention, an end of the inner drill rod 911 remote from the concentric tube cuttings suction breaker 100 adapted for dual gradient drilling is connected to the upper inner drill rod 9112 through an inner drill rod joint 9111, and an end of the outer drill rod 912 remote from the concentric tube cuttings suction breaker 100 adapted for dual gradient drilling is connected to the upper outer drill rod 9121 through a screw thread. The concentric tube drilling apparatus 200 is connected to surface equipment via an upper inner drill pipe 9112 and an upper outer drill pipe 9121.
In a specific embodiment of the present invention, the concentric tube debris suction-crushing device 100 suitable for dual-gradient drilling comprises a flow channel adapter 1 and a first adapter 2, wherein one end of the first adapter 2 is hermetically connected to an inner drill pipe 911 through a thread, an outer wall of the first adapter 2 is spaced apart from an inner wall of an outer drill pipe 912, and the other end of the first adapter 2 is hermetically connected to the flow channel adapter 1; the outer wall of one end of the flow channel adapter 1 is connected to the inner wall of the outer drill rod 912 in a sealing mode, the other end of the flow channel adapter 1 is communicated with the end drilling tool 92 in a sealing mode through threads, a drilling fluid overflowing cavity 30 is formed among the outer wall of the first connector 2, the inner wall of the outer drill rod 912 and the end face of one end of the flow channel adapter 1, and the drilling fluid overflowing cavity 30 is communicated with the drilling fluid injection space 913; a drilling fluid inflow channel 31 is arranged in the flow channel adapter 1, the drilling fluid inflow channel 31 is communicated with an axial through hole of the end drilling tool 92 and a drilling fluid flowing cavity 30, a drilling fluid backflow channel 32 is arranged in the flow channel adapter 1 and the first connector 2, the outlet end of the drilling fluid backflow channel 32 is positioned in the first connector 2 and communicated with the crushing part 33, the second end of the drilling fluid backflow channel 32 positioned in the flow channel adapter 1 can be communicated with the drilling fluid inflow channel 31 in a sealing manner, and the shunting of the drilling fluid in the drilling fluid inflow channel 31 is realized; the drilling fluid flow-back channel 32 is internally provided with a first jet flow throat part 41 and a second jet flow throat part 42 which are inwards convex at intervals along the axial direction, and the drilling fluid flow-back channel 32 is positioned between the first jet flow throat part 41 and the second jet flow throat part 42 to form a mixing cavity 5; an annular drilling fluid return-up channel 34 arranged at an interval with the drilling fluid inflow channel 31 is further arranged in the flow channel conversion joint 1, the second end of the annular drilling fluid return-up channel 34 is communicated with the external annular space, and the first end of the annular drilling fluid return-up channel 34 is communicated with the mixing cavity 5 in a sealing mode.
As shown in fig. 4 and 5, the debris suction breaking method using the concentric tube drilling apparatus 200 including the concentric tube debris suction breaking apparatus 100 suitable for dual gradient drilling of the present invention is as follows: drilling fluid from ground injection is shunted through drilling fluid inflow channel 31, some drilling fluid shunts to drilling fluid flowback passageway 32, form high-speed efflux through first efflux throat 41 and make hybrid chamber 5 form the low-pressure zone, partly drilling fluid flows to the well behind the operation of drilling, carry the drilling detritus and flow back, the drilling fluid that the low-pressure zone will be thoughtlessly congealed the detritus inhales rapidly, the drilling fluid that thoughtlessly congeals the detritus passes through the high-speed efflux of second efflux throat 42 and to the portion of smashing, large granule detritus breakage becomes the tiny particle detritus in the drilling fluid, the detritus of broken completion continues to flow back under the effect.
Specifically, the rock debris suction breaking method using the concentric tube drilling apparatus 200 includes the following steps:
step a, completing the assembly of the concentric tube drilling device, and placing the concentric tube drilling device in a well: firstly, a first connector 2 is hermetically connected to the bottom of an inner drill rod 911, a flow channel adapter 1 is connected to the bottom of the first connector 2, an outer drill rod 912 is sleeved, the outer drill rod 912 is hermetically connected with the flow channel adapter 1, an end drilling tool 92 is hermetically connected to the bottom of the flow channel adapter 1, and the assembled concentric pipe drilling device 200 (the end drilling tool 92, the concentric pipe rock debris suction crushing device 100 suitable for double-gradient drilling and the concentric drill rod structure 91) is put into a well;
b, starting drilling equipment, injecting high-speed flowing drilling fluid into the drilling fluid injection space 913 of the concentric drill rod structure 91 from the ground, and enabling the drilling fluid to enter the drilling fluid inflow channel 31 through the drilling fluid overflowing cavity 30; a portion of the drilling fluid is diverted to the drilling fluid return passage 32 and a portion of the drilling fluid flows into the well through the end hole flow passage 921 of the end hole 92;
c, the drilling fluid shunted into the drilling fluid backflow channel 32 is ejected to the mixing cavity 5 at a high speed under the action of the first jet flow throat part 41, and the mixing cavity 5 forms a low-pressure area due to the fact that the fluid speed is high; after drilling operation of drilling fluid flowing into a well is completed, drilling cuttings are carried into an external annular space of a concentric tube cuttings suction crushing device 100 suitable for dual-gradient drilling, drilling fluid mixed with cuttings in the external annular space flows back to enter an annular drilling fluid return passage 34, and the drilling fluid is quickly sucked in a low-pressure area;
d, under the action of the second jet flow throat part 42, the drilling fluid mixed with the rock debris is accelerated to shoot to the crushing part 33, large-particle rock debris is crushed into small-particle rock debris under the action of high-pressure water wedge and impact, and the particle size of rock debris particles is more uniform;
and e, returning the crushed rock debris to the return space 914 inside the inner drill rod 911 through the first joint return cavity 21 under the action of the drilling fluid, and finally returning the rock debris to the ground.
From the above, the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling provided by the invention has the following beneficial effects:
(1) the concentric tube rock debris suction and crushing device suitable for the dual-gradient drilling can realize reverse jet of high-speed fluid, and the mixing cavity forms a low-pressure area under the action of the first jet throat part, so that drilling fluid containing rock debris in the external annular space can be quickly sucked, and the probability of formation of a rock debris bed is reduced;
(2) in the concentric tube rock debris suction and crushing device suitable for dual-gradient drilling, under the action of the second jet throat part, the drilling fluid containing rock debris in the mixing cavity is jetted to the crushing part at a high speed, the rock debris is crushed for the second time by utilizing the high-speed jet of the drilling fluid and the crushing part, large-particle rock debris is crushed into small-particle rock debris, the particle size of rock debris particles is more uniform, and the rock debris is more easily carried and returned;
(3) when the concentric tube drilling device of the concentric tube rock debris suction crushing device suitable for the dual-gradient drilling is used for sucking rock debris, the drilling does not need to be stopped, the discharge capacity does not need to be increased, and special drilling fluid does not need to be used, so that the drilling efficiency of a horizontal well is effectively improved, the probability of drilling accidents is reduced, the guarantee is provided for safe and efficient drilling, the drilling time is shortened, the drilling cost is reduced, and the development prospect is wide.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
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| NL2024001B1 (en) * | 2019-10-11 | 2021-06-17 | Stichting Canopus Intellectueel Eigendom | Method and system for directional drilling |
| CN112756083B (en) * | 2019-10-21 | 2024-12-20 | 中石化石油工程技术服务有限公司 | A drilling mud tank bottom desilting and crushing head |
| CN113389513B (en) * | 2020-03-13 | 2024-12-27 | 中国石油天然气集团有限公司 | Horizontal well cuttings removal device and operation method thereof |
| CN111350476A (en) * | 2020-05-09 | 2020-06-30 | 西南石油大学 | A jet crushing suction recovery device suitable for natural gas hydrate exploitation |
| CN117868674B (en) * | 2024-01-30 | 2024-06-25 | 上海欧申科技有限公司 | Underground petroleum drilling equipment suitable for drilling and use method thereof |
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| CN105156048B (en) * | 2015-07-29 | 2018-01-05 | 中国石油天然气股份有限公司 | Concentric double-tube sand washing well washer |
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