CN109854193B - Mud circulation system and method for submarine drilling machine - Google Patents
Mud circulation system and method for submarine drilling machine Download PDFInfo
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- CN109854193B CN109854193B CN201910162084.1A CN201910162084A CN109854193B CN 109854193 B CN109854193 B CN 109854193B CN 201910162084 A CN201910162084 A CN 201910162084A CN 109854193 B CN109854193 B CN 109854193B
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Abstract
The invention discloses a mud circulation system and a mud circulation method of a submarine drilling machine, which relate to the technical field of deep water drilling equipment, wherein the system comprises: the system comprises an auxiliary ship, an umbilical cable, a coiled tubing tensioning section, a coiled tubing slurry input pipeline, a subsea slurry treatment device, a wellhead slurry recovery pipeline, a coiled tubing, a wellhead device, a subsea drilling machine base, an injection head and a derrick; one end of the umbilical cable is connected with the auxiliary ship, and the other end of the umbilical cable is connected with the submarine mud treatment device and is used for providing a channel for injecting mud into the seabed and returning the mud to the auxiliary ship; the submarine mud treatment device is used for outputting mud injected from the umbilical cable to the coiled tubing mud input pipeline, filtering the mud returned from the wellhead mud recovery pipeline and outputting the mud to the auxiliary ship through the umbilical cable. The invention has the advantages of long transmission distance and long service life.
Description
Technical Field
The invention relates to the technical field of deep water drilling equipment, in particular to a mud circulation system and method of a submarine drilling machine.
Background
At present, with the reduction of landings and shallow sea oil and gas reserves and the increase of exploitation difficulty, deep water areas gradually become hot spots for world oil and gas exploration. However, the conventional land or ocean platform drilling machine is difficult to meet the requirements of deep water drilling due to the restriction of factors such as water depth, stratum and the like. And the traditional land or ocean platform drilling machine has the advantages that the distance between the mud system and the wellhead is similar, the energy loss is small, the wellhead of the submarine drilling machine is positioned on the seabed and is hundreds of meters in concentration with the mud system on the auxiliary ship, the transmission distance is long, and the energy loss is large, so that the deep water drilling needs are difficult to meet.
Thus, in order to overcome the above drawbacks, there are currently some drilling techniques applicable in deep sea. For example, patent CN205370481U discloses a subsea mud suction system for realizing mud recovery, wherein one end of a casing of a mud suction device is fixed on a wellhead, a drill rod extends into a borehole through the casing, and left and right outlet channels are respectively connected with lifting pumps 1 and 2 through pipelines 1 and 2, so that mud is recovered to a sea drilling ship for recycling. For another example, patent CN102080510a discloses a subsea mud suction system and method for realizing riser-free mud recovery drilling, in which a side outlet is provided on the side wall of the lower part of the outer casing of the subsea mud suction device, and the side outlet is connected to the inlet of a subsea mud lift pump through a subsea drilling fluid delivery line, and the outlet of the subsea mud lift pump is connected to a drilling fluid treatment device on a subsea drilling vessel through a drilling fluid return line, so as to realize recycling. However, in the conventional subsea mud circulation system, the returned mud cannot be filtered, split and the like in advance on the seabed, so that the pipeline is easily blocked by impurities in the mud returned from the wellhead device, system faults are easily caused, and the service life of the system is short.
Disclosure of Invention
Therefore, the technical problem to be solved by the embodiment of the invention is that the service life of the submarine mud circulation system in the prior art is short.
To this end, an embodiment of the present invention provides a mud circulation system for a subsea drilling machine, comprising: the system comprises an auxiliary ship, an umbilical cable, a coiled tubing tensioning section, a coiled tubing slurry input pipeline, a subsea slurry treatment device, a wellhead slurry recovery pipeline, a coiled tubing, a wellhead device, a subsea drilling machine base, an injection head and a derrick;
the auxiliary ship is positioned on the sea surface;
one end of the umbilical cable is connected with the auxiliary ship, and the other end of the umbilical cable is connected with the seabed mud treatment device and is used for providing a channel for injecting mud into the seabed and returning the mud to the auxiliary ship;
one end of the coiled tubing tensioning section is connected with the injection head, and the other end of the coiled tubing tensioning section is connected with the coiled tubing roller section and is used for conveying mud injected into the well by the submarine mud treatment device;
one end of the coiled tubing slurry input pipeline is connected with the coiled tubing, and the other end of the coiled tubing slurry input pipeline is connected with the submarine slurry treatment device and is used for conveying slurry injected into the coiled tubing by the submarine slurry treatment device;
the submarine mud treatment device is used for outputting mud injected from the umbilical cable to a coiled tubing mud input pipeline, filtering the mud returned from a wellhead mud recovery pipeline and outputting the filtered mud to an auxiliary ship through the umbilical cable;
one end of the wellhead mud recycling pipeline is connected with the wellhead device, and the other end of the wellhead mud recycling pipeline is connected with the seabed mud treatment device and is used for conveying mud returned from the wellhead device to the seabed mud treatment device;
the bottom drilling machine base is arranged on the bottom of the sea, the derrick is fixed on the bottom drilling machine base, the continuous oil pipe is fixed on the bottom drilling machine base, the wellhead device is fixed on the bottom drilling machine base, and the injection head is arranged on the derrick and can move up and down on the derrick.
Preferably, the umbilical contains at least three cavities inside, one for the transmission cavity in which the transmission line is placed, one for the injection cavity for the injection of mud into the seabed and one for the return cavity for the return of mud to the auxiliary vessel.
Preferably, the subsea mud treatment device comprises: the device comprises a rock debris collecting box, a first lifting pump, a second lifting pump, an automatic converter and a filter tank;
the inlet of the automatic converter is connected with a channel for injecting slurry to the sea bottom in the umbilical cable, and the outlet of the automatic converter is connected with a slurry input pipeline of the continuous oil pipe;
the inlet of the filter tank is connected with the outlet of the wellhead mud recycling pipeline, the filter outlet is respectively connected with the inlets of the lifting pump I and the lifting pump II, and the residue outlet is connected with the inlet of the rock debris collecting box and is used for filtering mud returned from the wellhead mud recycling pipeline;
the rock debris collecting box is used for collecting, storing and filtering rock debris filtered by the filtering tank;
and outlets of the first lifting pump and the second lifting pump are respectively connected with a channel for returning mud to the auxiliary ship in the umbilical cable and are used for conveying the mud filtered by the filter tank back to the auxiliary ship.
Preferably, the auxiliary vessel comprises a mud dispenser, a vibrating screen, a mud cleaner, a deaerator, a medium speed centrifuge, a high speed centrifuge, a cuttings screw conveyor, a mud tank and a mud pump;
the mud tank is used for storing configured mud and treated mud;
the inlet of the slurry pump is connected with the slurry tank, and the outlet of the slurry pump is connected with one end of the umbilical cable and is used for injecting slurry in the slurry tank into the sea bottom through the umbilical cable;
the rock debris screw conveyor is used for removing sticky particles and hard clay in the umbilical cable return slurry, and the rock debris screw conveyor, the slurry distributor, the vibrating screen and the slurry cleaner are connected in sequence;
the mud distributor is used for distributing mud processed by the rock debris screw conveyor to the vibrating screen;
the vibrating screen is used for removing large-particle stratum scraps in the slurry;
the mud cleaner is used for removing sand particles and mud stratum fragments in the mud after the vibrating screen treatment;
the inlet of the deaerator is connected with the gas outlet of the mud cleaner and is used for removing harmful gas and combustible gas in the mud treated by the mud cleaner;
the inlet of the medium-speed centrifugal machine is connected with the drilling fluid outlet of the mud cleaner and is used for recycling solid phases in the weighted drilling fluid;
the high-speed centrifugal machine is connected with the medium-speed centrifugal machine and is used for treating drilling fluid treated by the medium-speed centrifugal machine.
Preferably, the slurry pump comprises a first slurry pump, a second slurry pump and a third slurry pump, only two of the three slurry pumps work at the same time, and when one of the working slurry pumps fails, the non-working slurry pump automatically replaces the failed slurry pump to work continuously.
Preferably, the number of the mud tanks is more than four; the number of the deaerators is more than two; the number of the vibrating screens is more than three; the number of the mud cleaners is more than two.
The slurry circulation method of the submarine drilling machine comprises the following steps:
injecting mud from the auxiliary vessel into the coiled tubing;
returning mud from the wellhead to the subsea mud treatment device through a wellhead mud recovery pipeline;
the submarine mud treatment device carries out first filtering treatment on mud;
returning the mud treated by the submarine mud treatment device to the auxiliary ship through the umbilical cable;
the auxiliary ship performs a second filtering process on the slurry and stores it.
Preferably, the step of injecting mud from the auxiliary vessel into the coiled tubing comprises:
controlling two slurry pumps of the first slurry pump, the second slurry pump and the third slurry pump to pump the slurry in the slurry tank into an injection cavity of the umbilical cable and transmitting the slurry to an automatic converter in the submarine slurry treatment device;
when the coiled tubing works, the automatic converter is controlled to be communicated with the coiled tubing slurry input pipeline, and slurry is transmitted from the automatic converter to the coiled tubing through the coiled tubing slurry input pipeline.
Preferably, the step of performing the first filtering treatment on the slurry by the subsea slurry treatment device comprises:
introducing mud returned by a wellhead mud recycling pipeline into a filtering tank;
controlling the filter tank to carry out filtering treatment so as to filter out oversized particle rock debris;
the oversized particulate cuttings are collected and stored in a cuttings collection bin.
Preferably, the step of subjecting the slurry to a second filtering treatment and storing by the auxiliary vessel comprises:
introducing the mud returned to the auxiliary ship into a cuttings screw conveyor for removing sticky particles and hard clay in the mud;
the slurry distributor is controlled to split the slurry processed by the rock debris screw conveyor into a first vibrating screen, a second vibrating screen and a third vibrating screen, and the first vibrating screen, the second vibrating screen and the third vibrating screen are controlled to remove large-particle stratum debris in the slurry;
the slurry treated by the vibrating screen is conveyed to a first slurry cleaner and a second slurry cleaner, and the first slurry cleaner and the second slurry cleaner are controlled to remove sand particles and mud stratum fragments with the particle size of 74-105 mu m in the slurry treated by the vibrating screen;
the harmful gas and the combustible gas generated after the treatment of the slurry cleaner are introduced into a first deaerator and a second deaerator for innocent treatment;
and sequentially inputting the drilling fluid generated after the treatment of the mud cleaner into a medium speed centrifuge and a high speed centrifuge, controlling the medium speed centrifuge to recycle the solid phase in the weighted drilling fluid, controlling the high speed centrifuge to treat the drilling fluid treated by the medium speed centrifuge, and then introducing the drilling fluid into a mud tank I, a mud tank II, a mud tank III and a mud tank IV for storage.
The technical scheme of the embodiment of the invention has the following advantages:
1. according to the submarine drilling rig mud circulation system provided by the embodiment of the invention, the submarine mud treatment device is arranged on the seabed, so that the mud returned from the wellhead mud recovery pipeline is filtered in advance, the smoothness of a mud return channel is ensured, the transmission is more reliable, impurities in the mud can be filtered, the damage caused by the blockage of the pipeline due to the impurities is avoided, and the service life of the system is prolonged. The slurry circulation system can be applied to a submarine drilling machine slurry circulation system for petroleum or natural gas hydrate exploitation, and has a long slurry transmission distance compared with land and ocean platform drilling machines. The mud is stored and treated by the auxiliary ship, so that the integral weight of the submarine drilling machine is greatly reduced, more drilling fluid can be provided for the submarine drilling machine, and the drilling target with larger depth is realized.
2. According to the mud circulation method of the submarine drilling machine, the submarine mud treatment device is used for carrying out preliminary filtration treatment on the returned mud, so that oversized particle rock debris is prevented from entering the return pipeline, pipeline blockage faults are avoided, transmission is more reliable, and the service life of a circulation system is prolonged. By assisting the ship to store and process the slurry, the slurry is far away from the slurry transmission distance of the land and ocean platform drilling machine, more drilling fluid can be provided for the submarine drilling machine, and the drilling target with larger depth is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an overall schematic of a specific example of a mud circulation system for a subsea rig in accordance with embodiment 1 of the present invention;
FIG. 2 is a schematic view showing a specific example of a subsea mud treatment device according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a specific example of auxiliary equipment in a cabin in embodiment 1 of the present invention;
FIG. 4 is a schematic view showing a specific example of the filtration tank in example 1 of the present invention;
fig. 5 is a flowchart showing a specific example of a mud circulation method of the subsea rig in embodiment 2 of the present invention.
Reference numerals: 1. an auxiliary ship; 1-1, a slurry pump I; 1-2, a slurry pump II; 1-3, a slurry pump III; 1-4, a first mud tank; 1-5, a mud tank II; 1-6, a mud tank III; 1-7, a mud tank IV; 1-8, a deaerator I; 1-9, a deaerator II; 1-10, a medium-speed centrifuge; 1-11, high-speed centrifuges; 1-12, a rock debris screw conveyor; 1-13, vibrating screen I; 1-14, a vibrating screen II; 1-15, vibrating screen III; 1-16, mud distributor; 1-17, a first mud cleaner; 1-18, a second mud cleaner; 2. an umbilical; 3. a coiled tubing tension section; 4. a coiled tubing mud input conduit; 5. a subsea mud treatment device; 5-1, a rock debris collecting box; 5-2, lifting the pump I; 5-3, lifting a pump II; 5-4, an automatic converter; 5-5, a filter tank; 5-5-1, a primary filter tank; 5-5-2, S bend filter tanks; 5-5-3, a first inlet; 5-5-4, a first outlet; 5-5-5, a residue outlet; 5-5-6, a first filter layer; 5-5-7, a second inlet; 5-5-8, a second outlet; 5-5-9, a second filter layer; 6. a wellhead mud recovery pipeline; 7. a coiled tubing; 8. a wellhead assembly; 9. a subsea rig substructure; 10. a derrick; 11. an injection head.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In describing the present invention, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The use of the terms "comprises" and/or "comprising," when used in this specification, are intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term "and/or" includes any and all combinations of one or more of the associated listed items. The terms "upper," "lower," "vertical," "horizontal," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description and simplicity of description, and do not necessarily indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, and can also be the communication between the two elements; the connection may be wireless or wired. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The embodiment provides a slurry circulation system of a submarine drilling machine, which is particularly suitable for deep water drilling for exploitation of petroleum or natural gas hydrate. As shown in fig. 1, the subsea rig mud circulation system comprises: the system comprises an auxiliary ship 1, an umbilical cable 2, a coiled tubing tension section 3, a coiled tubing mud input pipeline 4, a seabed mud processing device 5, a wellhead mud recycling pipeline 6, a coiled tubing 7, a wellhead device 8, a seabed drilling machine base 9, an injection head 11 and a derrick 10.
The auxiliary vessel 1 is located on the sea surface. One end of the umbilical 2 is coupled to the auxiliary vessel 1 and the other end is coupled to a subsea mud treatment device 5 for providing a passage for injecting mud into the seabed and returning mud to the auxiliary vessel 1. Preferably, the umbilical contains at least three cavities inside, one for the power transmission cavity in which the power line is placed, one for the injection cavity for injecting mud into the sea floor, and one for the return cavity for returning mud to the auxiliary vessel 1. One end of the coiled tubing tension section 3 is connected with the injection head 11, and the other end is connected with the coiled tubing roller section for conveying mud injected into the well by the seabed mud processing device 5. One end of the coiled tubing mud input pipeline 4 is connected with the coiled tubing 7, and the other end is connected with the seabed mud processing device 5, and is used for conveying mud injected into the coiled tubing 7 by the seabed mud processing device 5. The subsea mud treatment device 5 is configured to output mud injected from the umbilical 2 to the coiled tubing mud input pipeline 4, and to output mud returned from the wellhead mud retrieval pipeline 6 to the auxiliary vessel 1 via the umbilical 2 after filtering. One end of the wellhead mud recovery pipeline 6 is connected with the wellhead device 8, and the other end is connected with the seabed mud processing device 5 for transmitting mud returned from the wellhead device 8 to the seabed mud processing device 5. The submarine drilling rig substructure 9 is arranged on the seabed, the derrick 10 is fixed on the submarine drilling rig substructure 9, the coiled tubing 7 is fixed on the submarine drilling rig substructure 9, the wellhead device 8 is fixed on the submarine drilling rig substructure 9, and the injection head 11 is arranged on the derrick 10 and can move up and down on the derrick 10.
According to the mud circulation system of the submarine drilling machine, the submarine mud treatment device is arranged on the seabed, mud returned from the wellhead mud recovery pipeline is filtered in advance, smoothness of a mud return channel is guaranteed, transmission is more reliable, impurities in the mud can be filtered, damage caused by the fact that the pipeline is blocked by the impurities is avoided, and the service life of the system is prolonged. The slurry circulation system can be applied to a submarine drilling machine slurry circulation system for petroleum or natural gas hydrate exploitation, and has a long slurry transmission distance compared with land and ocean platform drilling machines. The mud is stored and treated by the auxiliary ship, so that the integral weight of the submarine drilling machine is greatly reduced, more drilling fluid can be provided for the submarine drilling machine, and the drilling target with larger depth is realized.
Preferably, as shown in fig. 2, the subsea mud treatment device 5 comprises: the device comprises a rock debris collecting box 5-1, a first lifting pump 5-2, a second lifting pump 5-3, an automatic converter 5-4 and a filtering tank 5-5. The inlet of the automatic converter 5-4 is connected with a channel for injecting slurry to the sea bottom in the umbilical cable 2, and the outlet is connected with a coiled tubing slurry input pipeline 4. The inlet of the filter tank 5-5 is connected with the outlet of the wellhead mud recycling pipeline 6, the filter outlet is respectively connected with the inlets of the first lifting pump 5-2 and the second lifting pump 5-3, and the residue outlet is connected with the inlet of the rock debris collecting box 5-1, so that the slurry returned from the wellhead mud recycling pipeline 6 is filtered, oversized particle rock debris is filtered, and the pipeline is prevented from being blocked when the slurry returns. The rock debris collecting box 5-1 is used for collecting and storing the rock debris filtered by the filtering pool 5-5. Outlets of the first lifting pump 5-2 and the second lifting pump 5-3 are respectively connected with a channel (return cavity) in the umbilical cable 2 for returning the mud to the auxiliary ship 1, and the channel is used for conveying the mud filtered by the filtering tank 5-5 back to the auxiliary ship 1.
Preferably, as shown in FIG. 3, the auxiliary vessel 1 includes a mud dispenser 1-16, a first vibrating screen 1-13, a second vibrating screen 1-14, a third vibrating screen 1-15, a first mud cleaner 1-17, a second mud cleaner 1-18, a first deaerator 1-8, a second deaerator 1-9, a medium speed centrifuge 1-10, a high speed centrifuge 1-11, a cuttings screw conveyor 1-12, a first mud tank 1-4, a second mud tank 1-5, a third mud tank 1-6, a fourth mud tank 1-7, a first mud pump 1-1, a second mud pump 1-2, and a third mud pump 1-3. The first mud tank 1-4, the second mud tank 1-5, the third mud tank 1-6 and the fourth mud tank 1-7 are used for storing the prepared mud and the treated mud. The first slurry pump 1-1, the second slurry pump 1-2 and the third slurry pump 1-3 are used for injecting the slurry in the slurry tank into the seabed through the umbilical cable injection cavity. Preferably, in order to ensure the reliability of the slurry circulation system, the slurry pump adopts a dual-purpose one-standby working mode, namely, only two slurry pumps 1-1, 1-2 and 1-3 work at the same time, and when one of the slurry pumps fails, the other slurry pump automatically replaces the failed slurry pump to continue to work. The output mode of the mud tanks can be, but is not limited to, a sequential output mode, namely 1-4 output of the mud tank I, 1-5 output of the mud tank II after 1-4 input of the mud tank I, 1-6 output of the mud tank III after 1-5 input of the mud tank II, and 1-7 output of the mud tank IV after 1-6 input of the mud tank III. The cuttings screw conveyor 1-12 is used to remove sticky particles and hard clay from the umbilical return mud in the return chamber so that the return mud does not clog other cleaning equipment. The mud distributors 1-16 split the mud after the cuttings screw conveyor treatment to three vibrating screens. 1-13 vibrating screens, 1-14 vibrating screens and 1-15 vibrating screens are used for removing large-particle stratum fragments in slurry. The first mud cleaner 1-17 and the second mud cleaner 1-18 are used for removing sand particles and mud stratum fragments in the mud after the vibrating screen treatment. The first deaerator 1-8 and the second deaerator 1-9 are used for removing harmful gas and combustible gas in the slurry after being treated by the slurry cleaner. Medium speed centrifuges 1-10 recover the solid phase in the weighted drilling fluid. The high-speed centrifuges 1-11 are used for treating drilling fluid treated by the medium-speed centrifuges.
Preferably, as shown in FIG. 4, the filter tank 5-5 includes: primary filter tank 5-5-1 and S bend filter tank. The filter tank 5-5 may be integrally disposed within a sealed housing. The outlet of the wellhead mud recycling pipeline 6 is connected with the first inlet 5-5-3 of the primary filter tank 5-5-1, the first filter layer 5-5-6 is placed in the primary filter tank 5-5-1 and used for filtering out oversized particle rock debris in mud, the oversized particle rock debris is deposited at the inclined bottom of the primary filter tank 5-5-1 and is output to the rock debris collecting box 5-1 from the residue outlet 5-5, the first outlet 5-5-4 of the primary filter tank 5-1 is connected with the second inlet 5-5-7 of the S-bend filter tank 5-5-2 through a pipeline, the second filter layer 5-5-9 is placed in the S-bend filter tank 5-5-2 along with a bend and used for filtering out biomass in mud, the S-bend filter tank is designed according to the activity characteristics of biomass, the biomass in the mud can be effectively filtered out, and the filtering efficiency is greatly improved. The second outlet 5-5-8 of the S bend filter tank 5-5-2 is respectively connected with inlets of the first lifting pump 5-2 and the second lifting pump 5-3, and is conveyed to the auxiliary ship through an umbilical cable.
The mud circulation of the mud circulation system of the submarine drilling machine mainly comprises two processes of mud injection into the submarine drilling machine from the auxiliary ship and mud return to the auxiliary ship from the submarine drilling machine.
The mud injection flow is to assist two mud pumps 1-1, 1-2 and 1-3 in the cabin of the ship 1 to pump mud in a mud tank 1-4, a mud tank 2-5, a mud tank three 1-6 and a mud tank four 1-7 into an injection cavity of the umbilical cable 2 and transmit the mud to an automatic converter 5-4 in the submarine mud treatment device 5. When the coiled tubing 7 is in operation, the coiled tubing mud input conduit 4 is energized and mud is transferred from the automatic converter 5-4 to the coiled tubing 7 through the coiled tubing mud input conduit 4.
The mud returning flow is that mud returned by the wellhead device 8 is transmitted to the seabed mud processing device 5 through the wellhead mud recycling pipeline 6, the mud entering the seabed mud processing device 5 is firstly subjected to primary treatment through the filtering tank 5-5, and oversized particle rock debris is filtered out and stored in the rock debris collecting box 5-1, so that the pipeline is prevented from being blocked when the mud returns. After the drilling process is finished, the auxiliary ship 1 recovers the rock debris collection tank 5-1 and carries it back to the land for disposal. The mud after preliminary treatment in the filter tank 5-5 is conveyed back to the auxiliary ship 1 through the return cavity of the umbilical cable 2 under the action of the first lifting pump 5-2 and the second lifting pump 5-3. The mud returned to the auxiliary vessel 1 is first passed through the cuttings screw conveyor 1-12 to remove sticky particles and hard clay from the mud so that the returned mud does not clog other cleaning equipment. The mud distributor 1-16 divides the mud processed by the rock debris screw conveyor 1-12 to a first vibrating screen 1-13, a second vibrating screen 1-14 and a third vibrating screen 1-15 for removing large-particle stratum debris in the mud. The first mud cleaner 1-17 and the second mud cleaner 1-18 are used for removing sand particles and mud-like stratum fragments of 74-105 mu m in the mud after the vibrating screen treatment. The first deaerator 1-8 and the second deaerator 1-9 are used for removing harmful gas and combustible gas in the slurry after being treated by the slurry cleaner. The treated slurry is sequentially input into a medium-speed centrifuge 1-10 and a high-speed centrifuge 1-11, the medium-speed centrifuge 1-10 is used for recovering solid phase in the weighted drilling fluid, and the high-speed centrifuge 1-11 is used for treating the drilling fluid treated by the medium-speed centrifuge. After being treated by a high-speed centrifugal machine 1-11, the slurry flows into a first slurry tank 1-4, a second slurry tank 1-5, a third slurry tank 1-6 and a fourth slurry tank 1-7, so that the recycling of slurry is realized.
Example 2
The embodiment provides a slurry circulation method of a submarine drilling machine, which comprises the following steps as shown in fig. 5:
s1, injecting slurry from an auxiliary ship 1 to a continuous oil pipe 7;
s2, returning the slurry from the wellhead device 8 to the seabed slurry treatment device 5 through the wellhead slurry recovery pipeline 6;
s3, performing first filtering treatment on the slurry by the seabed slurry treatment device 5;
s4, returning the mud processed by the seabed mud processing device 5 to the auxiliary ship 1 through the umbilical cable 2;
s5, the auxiliary ship 1 performs second filtering treatment on the slurry and stores the slurry.
Preferably, the step of injecting S1 mud from the auxiliary vessel 1 into the coiled tubing 7 comprises:
s11, controlling two slurry pumps of the first slurry pump 1-1, the second slurry pump 1-2 and the third slurry pump 1-3 to pump slurry in a slurry tank into an injection cavity of the umbilical cable 2 and transmitting the slurry to an automatic converter 5-4 in the submarine slurry treatment device 5;
and S12, when the continuous oil pipe 7 works, the automatic converter 5-4 is controlled to be communicated with the continuous oil pipe slurry input pipeline 4, and slurry is transmitted from the automatic converter 5-4 to the continuous oil pipe 7 through the continuous oil pipe slurry input pipeline 4.
Preferably, the step of performing the first filtering treatment on the slurry by the subsea slurry treatment device 5 of S3 comprises:
s31, introducing mud returned by a wellhead mud recycling pipeline 6 into a filtering tank 5-5;
s32, controlling the filter tank 5-5 to carry out filtering treatment so as to filter out oversized particle rock debris;
s33, collecting and storing the oversized particle rock debris in a rock debris collecting box 5-1.
Preferably, the step of the auxiliary ship 1 of S5 performing the second filtering treatment and storing the mud comprises:
s51, introducing the slurry returned to the auxiliary ship 1 into the detritus screw conveyor 1-12 to remove sticky particles and hard clay in the slurry;
s52, controlling a mud distributor 1-16 to split mud processed by the rock debris screw conveyor 1-12 into a first vibrating screen 1-13, a second vibrating screen 1-14 and a third vibrating screen 1-15, and controlling the first vibrating screen 1-13, the second vibrating screen 1-14 and the third vibrating screen 1-15 to remove large-particle stratum debris in the mud;
s53, conveying the slurry after the vibrating screen treatment to a first slurry cleaner 1-17 and a second slurry cleaner 1-18, and controlling the first slurry cleaner 1-17 and the second slurry cleaner 1-18 to remove sand particles and mud stratum fragments with the particle size of 74-105 mu m in the slurry after the vibrating screen treatment;
s54, introducing harmful gas and combustible gas generated after the treatment of the slurry cleaner into the first deaerator 1-8 and the second deaerator 1-9 for harmless treatment;
s55, sequentially inputting drilling fluid generated after the treatment of the mud cleaner into a medium speed centrifuge 1-10 and a high speed centrifuge 1-11, controlling the medium speed centrifuge 1-10 to recycle solid phase in the weighted drilling fluid, controlling the high speed centrifuge 1-11 to treat the drilling fluid treated by the medium speed centrifuge 1-10, and then introducing the drilling fluid into a mud tank I1-4, a mud tank II 1-5, a mud tank III 1-6 and a mud tank IV 1-7 for storage.
According to the mud circulation method of the submarine drilling machine, the submarine mud treatment device is used for carrying out preliminary filtration treatment on the returned mud, so that oversized particle rock debris is prevented from entering the return pipeline, pipeline blockage faults are avoided, the transmission is more reliable, and the service life of a circulation system is prolonged. By assisting the ship to store and process the slurry, the slurry is far away from the slurry transmission distance of the land and ocean platform drilling machine, more drilling fluid can be provided for the submarine drilling machine, and the drilling target with larger depth is realized.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. A subsea rig mud circulation system, comprising: the system comprises an auxiliary ship (1), an umbilical cable (2), a coiled tubing tensioning section (3), a coiled tubing slurry input pipeline (4), a subsea slurry treatment device (5), a wellhead slurry recovery pipeline (6), a coiled tubing (7), a wellhead device (8), a subsea drilling machine base (9), an injection head (11) and a derrick (10);
-the auxiliary vessel (1) is located on the sea surface;
one end of the umbilical cable (2) is connected with the auxiliary ship (1), and the other end of the umbilical cable is connected with the seabed mud treatment device (5) and is used for providing a channel for injecting mud into the seabed and returning the mud to the auxiliary ship (1);
one end of the coiled tubing tensioning section (3) is connected with the injection head (11), and the other end of the coiled tubing tensioning section is connected with the coiled tubing roller section and is used for conveying mud injected into the well by the submarine mud treatment device (5);
one end of the coiled tubing mud input pipeline (4) is connected with the coiled tubing (7), and the other end of the coiled tubing mud input pipeline is connected with the submarine mud treatment device (5) and is used for conveying mud injected into the coiled tubing (7) by the submarine mud treatment device (5);
the submarine mud treatment device (5) is used for outputting mud injected from the umbilical cable (2) to the coiled tubing mud input pipeline (4), filtering the mud returned from the wellhead mud recovery pipeline (6) and outputting the filtered mud to the auxiliary ship (1) through the umbilical cable (2);
one end of the wellhead mud recycling pipeline (6) is connected with the wellhead device (8), and the other end of the wellhead mud recycling pipeline is connected with the seabed mud treatment device (5) and is used for conveying mud returned by the wellhead device (8) to the seabed mud treatment device (5);
the submarine drilling machine base (9) is arranged on the seabed, the derrick (10) is fixed on the submarine drilling machine base (9), the coiled tubing (7) is fixed on the submarine drilling machine base (9), the wellhead device (8) is fixed on the submarine drilling machine base (9), and the injection head (11) is arranged on the derrick (10) and can move up and down on the derrick (10);
the subsea mud treatment device (5) comprises: the rock debris collecting box (5-1), the lifting pump I (5-2), the lifting pump II (5-3), the automatic converter (5-4) and the filtering tank (5-5);
an inlet of the automatic converter (5-4) is connected with a channel for injecting slurry to the sea bottom in the umbilical cable (2), and an outlet of the automatic converter is connected with a continuous oil pipe slurry input pipeline (4);
the inlet of the filter tank (5-5) is connected with the outlet of the wellhead mud recycling pipeline (6), the filter outlet is respectively connected with the inlets of the lifting pump I (5-2) and the lifting pump II (5-3), and the residue outlet is connected with the inlet of the rock debris collecting box (5-1) and is used for filtering mud returned from the wellhead mud recycling pipeline (6);
the rock debris collecting box (5-1) is used for collecting and storing the rock debris filtered by the filtering tank (5-5);
outlets of the first lifting pump (5-2) and the second lifting pump (5-3) are respectively connected with a channel in the umbilical cable (2) for returning slurry to the auxiliary ship (1) and used for conveying the slurry filtered by the filter tank (5-5) back to the auxiliary ship (1);
the filter tank (5-5) comprises: a primary filter tank (5-5-1) and an S bend filter tank; the outlet of the wellhead mud recycling pipeline (6) is connected with a first inlet (5-5-3) of a primary filter tank (5-5-1), a first filter layer (5-5-6) is arranged in the primary filter tank (5-5-1) and is used for filtering out oversized particle rock debris in mud, the oversized particle rock debris is precipitated at the inclined bottom of the primary filter tank (5-5-1), the oversized particle rock debris is output to a rock debris collecting box (5-1) from a residue outlet (5-5-5), a first outlet (5-5-4) of the primary filter tank (5-5-1) is connected with a second inlet (5-5-7) of an S-curve filter tank (5-5-2) through a pipeline, a second filter layer (5-5-9) is arranged in the S-curve filter tank (5-5-2) along with a curve, and is used for filtering out biomass in the mud, and the S-curve filter tank is designed according to a bionics principle according to the activity characteristic of the biomass; the second outlet (5-5-8) of the S bend filter tank (5-5-2) is respectively connected with inlets of the lifting pump I (5-2) and the lifting pump II (5-3) and is conveyed to an auxiliary ship through an umbilical cable.
2. Subsea rig mud circulation system according to claim 1, characterized in that the umbilical contains at least three cavities inside, one for the power transmission cavity for placing the power transmission line, one for the injection cavity for injecting mud into the sea floor and one for the return cavity for returning mud to the auxiliary vessel (1).
3. The subsea rig mud circulation system according to claim 1, characterized in that the auxiliary vessel (1) comprises a mud distributor (1-16), a vibrating screen, a mud cleaner, a deaerator, a medium speed centrifuge (1-10), a high speed centrifuge (1-11), a cuttings screw conveyor (1-12), a mud tank and a mud pump;
the mud tank is used for storing configured mud and treated mud;
the inlet of the slurry pump is connected with the slurry tank, and the outlet of the slurry pump is connected with one end of the umbilical cable (2) and is used for injecting slurry in the slurry tank into the sea bottom through the umbilical cable (2);
the rock debris screw conveyor (1-12) is used for removing sticky particles and hard clay in returned mud of the umbilical cable (2), and the rock debris screw conveyor (1-12), the mud distributor (1-16), the vibrating screen and the mud cleaner are connected in sequence;
the mud distributor (1-16) is used for distributing mud processed by the rock debris screw conveyor (1-12) to the vibrating screen;
the vibrating screen is used for removing large-particle stratum scraps in the slurry;
the mud cleaner is used for removing sand particles and mud stratum fragments in the mud after the vibrating screen treatment;
the inlet of the deaerator is connected with the gas outlet of the mud cleaner and is used for removing harmful gas and combustible gas in the mud treated by the mud cleaner;
the inlet of the medium-speed centrifuge (1-10) is connected with the drilling fluid outlet of the mud cleaner and is used for recycling solid phase in the weighted drilling fluid;
the high-speed centrifugal machine (1-11) is connected with the medium-speed centrifugal machine (1-10) and is used for treating drilling fluid treated by the medium-speed centrifugal machine (1-10).
4. A subsea rig mud circulation system according to claim 3, wherein the mud pumps comprise a first mud pump (1-1), a second mud pump (1-2), and a third mud pump (1-3), only two of the three mud pumps being operated simultaneously, and when one of the operated mud pumps fails, the non-operated mud pump automatically replaces the failed mud pump to continue operation.
5. A subsea rig mud circulation system according to claim 3, wherein the number of mud tanks is four or more; the number of the deaerators is more than two; the number of the vibrating screens is more than three; the number of the mud cleaners is more than two.
6. A subsea drilling mud circulation method of a subsea drilling mud circulation system according to any of claims 1-5, comprising the steps of:
injecting mud from the auxiliary vessel (1) into the coiled tubing (7);
returning mud from the wellhead (8) to the subsea mud treatment device (5) through the wellhead mud recovery pipeline (6);
the submarine mud treatment device (5) carries out first filtering treatment on mud;
returning the mud treated by the submarine mud treatment device (5) to the auxiliary ship (1) through the umbilical cable (2);
the auxiliary ship (1) carries out second filtering treatment on the slurry and stores the slurry;
the step of performing a first filtering treatment on the slurry by the subsea slurry treatment device (5) comprises:
the mud returned by the wellhead mud recycling pipeline (6) is led into a filtering tank (5-5);
controlling the filter tank (5-5) to carry out filtering treatment so as to filter out oversized particle rock debris;
the oversized particle cuttings are collected and stored in a cuttings collection box (5-1).
7. The subsea rig mud circulation method according to claim 6, characterized in that the step of injecting mud from the auxiliary vessel (1) to the coiled tubing (7) comprises:
controlling two slurry pumps of the first slurry pump (1-1), the second slurry pump (1-2) and the third slurry pump (1-3) to pump slurry in a slurry tank into an injection cavity of the umbilical cable (2) and transmitting the slurry to an automatic converter (5-4) in the submarine slurry treatment device (5);
when the continuous oil pipe (7) works, the automatic converter (5-4) is controlled to be communicated with the continuous oil pipe slurry input pipeline (4), and slurry is transmitted from the automatic converter (5-4) to the continuous oil pipe (7) through the continuous oil pipe slurry input pipeline (4).
8. The subsea drilling mud circulation method according to claim 6, characterized in that the step of the auxiliary vessel (1) performing a second filtering treatment and storing of the mud comprises:
introducing the slurry returned to the auxiliary vessel (1) into a cuttings screw conveyor (1-12) for removing sticky particles and hard clay from the slurry;
controlling a slurry distributor (1-16) to split the slurry processed by the rock debris screw conveyor (1-12) into a first vibrating screen (1-13), a second vibrating screen (1-14) and a third vibrating screen (1-15), and controlling the first vibrating screen (1-13), the second vibrating screen (1-14) and the third vibrating screen (1-15) to remove large-particle stratum debris in the slurry;
delivering the slurry after the vibrating screen treatment to a first slurry cleaner (1-17) and a second slurry cleaner (1-18), and controlling the first slurry cleaner (1-17) and the second slurry cleaner (1-18) to remove sand particles and mud stratum fragments with the particle size of 74-105 mu m in the slurry after the vibrating screen treatment;
the harmful gas and the combustible gas generated after the treatment of the slurry cleaner are introduced into a first deaerator (1-8) and a second deaerator (1-9) for harmless treatment;
drilling fluid generated after the treatment of the mud cleaner is sequentially input into a medium-speed centrifugal machine (1-10) and a high-speed centrifugal machine (1-11), the medium-speed centrifugal machine (1-10) is controlled to recycle solid phase in the weighted drilling fluid, the high-speed centrifugal machine (1-11) is controlled to treat the drilling fluid treated by the medium-speed centrifugal machine (1-10), and then the drilling fluid is introduced into a mud tank I (1-4), a mud tank II (1-5), a mud tank III (1-6) and a mud tank IV (1-7) for storage.
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| CN113585992A (en) * | 2021-07-22 | 2021-11-02 | 深圳市工勘岩土集团有限公司 | Pump suction reverse circulation drilling structure of super-thick covering layer large-diameter rock-socketed cast-in-place pile |
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