CN110905411A - Underwater drilling positioning method for deep water area - Google Patents
Underwater drilling positioning method for deep water area Download PDFInfo
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- CN110905411A CN110905411A CN201911086477.5A CN201911086477A CN110905411A CN 110905411 A CN110905411 A CN 110905411A CN 201911086477 A CN201911086477 A CN 201911086477A CN 110905411 A CN110905411 A CN 110905411A
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- drilling
- ship
- positioning
- anchor
- protective sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/043—Directional drilling for underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/04—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by dip members, e.g. dip-sticks
Abstract
The invention discloses a method for positioning underwater drilling in a deep water area; the method comprises the steps of assembling a drilling ship, anchoring the drilling ship, positioning the drilling ship and running in a protective sleeve; the deepwater area underwater drilling positioning method can enable deepwater area drilling positioning accuracy to meet the specification and design requirements, improves deepwater area drilling positioning accuracy, improves drilling quality, reduces time for frequently correcting ship positions, improves drilling efficiency, reduces engineering cost, and has the advantages of simplicity in operation, safety, convenience and high efficiency.
Description
Technical Field
The invention relates to the technical field of drilling positioning, in particular to a positioning method for underwater drilling in a deep water area.
Background
The geological exploration by using underwater drilling positioning is the most common geological exploration method for deep water geological exploration engineering, wherein underwater drilling is the operation with highest technical requirement and the largest construction difficulty in the deep water geological exploration engineering, the drilling position is positioned under deep water, the positioning difficulty is large, the hole position cannot be directly measured, the deep water drilling is carried out under the conditions of invisibility and no touch, the whole operation process of the deep water drilling is operated on a water surface operation platform, the drilling process is carried out under the water, the drilling condition cannot be directly observed, the accuracy of the underwater drilling positioning in a deep water area and the quality and the pore-forming rate of the underwater drilling directly influence whether the construction engineering can meet the design requirement, and the exploration effect and the engineering cost of the deep water geological exploration engineering are also directly influenced. The great water depth causes great difficulty in drilling positioning, and how to improve the drilling positioning precision is one of the key problems to be solved urgently.
Disclosure of Invention
The invention aims to provide a positioning method for underwater drilling in a deep water area.
In order to achieve the purpose, the technical solution of the invention is as follows: the technical scheme adopted by the method for positioning the underwater drill hole in the deep water area comprises the steps of assembling a drilling ship, anchoring the drilling ship, positioning the drilling ship and inserting a protective sleeve;
the assembly of the drillship comprises the following steps:
(1) selection of drillship: and (2) modifying a 200-300 ton power-driven iron barge into a drilling ship, and connecting the two drilling ships together by using six uniformly distributed I-shaped steel.
(2) And cutting a circular hole with the diameter of 400-500 mm at the center of the middle front part of the drilling ship deck and the bottom of the ship on the same vertical line, and firmly welding by using steel pipes with the same diameter to ensure that the circular hole is not subjected to water seepage and is used as a channel of a drilling hole protection guide pipe.
(3) And installing base wood on the deck of the drilling ship, wherein the base wood is connected with the deck of the ship through a screw, all wood boards with the thickness of 50mm are nailed and paved on the base wood, and railings with the height of 1.2m are erected on the periphery of the base wood.
(4) The drilling machine base station is arranged at the middle front part of the drilling ship and keeps flat, the length and the width of a drilling field are not less than 10m multiplied by 6m, the tripod leg seat is arranged on a sleeper, and the drilling ship adopts a 10t winch and is arranged at the bow of the drilling ship.
The anchoring of the drilling vessel comprises the following steps:
(1) before the anchoring, the maritime affairs and channel departments are informed to arrive at the site to command the safe passing of the passing ships; when the iron barge is anchored, an operator cannot stand within the range of the movement of the anchor rope and the anchor chain and has to wear a life jacket; after the drilling ship is anchored and positioned, a channel department is immediately informed to arrange a navigation mark around the drilling ship according to a plan so as to correctly set the navigation mark, and the ship is guided to run according to a specified route, so that sea damage accidents are avoided.
(2) The number of the anchor dropping is 5-9, the number of the front main anchors can be 1 or 2, the anchor ropes are consistent with the direction of water flow, the number of the front splayed anchors is 2, the included angle between the main anchor rope and the front splayed anchor rope is 35-45 degrees on two sides of the bow of the ship, the number of the rear splayed anchors is 2, the included angle between the main anchor rope and the rear splayed anchor rope is 35-45 degrees on two sides of the stern of the drilling ship, further, the rear main anchor can be additionally arranged, and 1-2 side anchors can also be respectively arranged on two sides of the drilling ship.
(3) When the anchor is thrown, the iron anchor, the anchor chain and the anchor rope are firmly connected on the anchor throwing ship and are arranged in sequence, the drilling ship self-navigates to a proper position at the upstream of a hole site, the main anchor is firstly thrown down, the drilling ship slowly runs downstream, and the anchor rope is tied on the cable pile at a certain distance from the hole site. Slowly loosening anchor ropes on the mooring bollards, fastening the anchor ropes when the drill ship is closer to the hole site, throwing the anchor ship, and throwing the anchors one by one according to the sequence of front and rear splayed anchors and side anchors.
The positioning of the drilling vessel comprises the following steps:
(1) before anchoring, a hole site reference mark is arranged on the shore, and when the drilling ship is driven to the mark, RTK is used for accurate positioning.
(2) After each anchor is thrown, each anchor rope is tightly adjusted, the hole site is measured, and the anchor ropes are twisted tightly, so that the drilling ship is stable.
(3) And a water gauge is arranged on the water side so as to observe the fluctuation of the water level at any time, the water level and the hole depth are corrected in the drilling process, and the error of the drilling hole position on the water is within 0.5 m.
(4) The boundary of the anchor rope close to the channel is marked according to the regulations, so that the accidents of hanging the boat and colliding the boat by the anchor rope are prevented.
The lower protective sleeve comprises the following steps:
(1) and after the drilling ship confirms that the positioning is stable, the protective sleeves can be put in, the protective sleeves are put in by adopting a single connection method, and the protective sleeves to be put in are connected one by one according to the numbers of the protective sleeves and are put in water until the planned depth is reached.
Furthermore, the pipe boots with the nails are used to the riverbed without the covering layer, and prevent the protective sleeve from sliding along the rock surface, the protective sleeve adopts a thick-wall sleeve pipe with diameter phi 219mm or phi 168mm, and the protective sleeve pipe adopts a thick-wall sleeve pipe with diameter phi 168mm or phi 127 mm.
(2) When protective case low tube, a protective case length is about 4m, and when the river was darker, several under the long protective case can be more, when the river was lighter, the long protective case should be less down, and nipple joint protective case (length 0.5m ~ 1.0 m) should be adopted at the top to connect the usefulness of unloading when the river rises and falls, concrete step is as follows:
1) setting a safety rope: when a first section of protective sleeve is put in, a movable iron ring is sleeved below a top coupling, and when each section of protective sleeve is put in successively after a safety rope is tied, the movable iron ring is sleeved to penetrate into the safety rope until the whole protective sleeve is put in, and finally the safety rope is fixed on a drill site.
2) Setting a positioning rope: the specification and the length of the positioning ropes are selected according to the water depth, the flow rate and the pulling position, the two positioning ropes are generally tied at the middle part of the protective casing string, and the included angle between the two positioning ropes and the horizontal plane is about 45 degrees. The positioning rope must pass through the bottom of the ship and be pulled upstream, and is fixed on the mooring bollard at the bow of the ship so as to adjust the verticality of the protective sleeve and play a role in positioning the protective sleeve.
3) The positioning method of the protective sleeve: after the protective sleeve is lowered to the bottom, the verticality of the protective sleeve can be corrected by a geological compass or a horizontal ruler, the positioning accuracy is corrected by a vertical shaft drill rod, the verticality of the pipe column must be ensured, and if the pipe column has deflection, the pipe column should be adjusted in time. If necessary, the protective sleeve can be driven into the covering layer for 3-5 m, but the driving is not too much, so that the difficulty in pulling the sleeve is avoided.
4) And if the wind is strong and the water level rises too fast, stopping drilling, lifting the drilling tool out of the drilled hole, and lengthening the protective sleeve.
Furthermore, the safety rope adopts a soft-center steel wire rope with diameter phi of 12-15 mm.
Furthermore, the screw thread connection of the protective sleeve must be firm and reliable, the person who is not firm can not be put into water, and the screw thread should be put in place.
The orifice clamp plate must be tightened to prevent the protective sleeve from falling off.
The positioning rope, the safety rope and the pressure reducing rope are specially assigned to command with a specially assigned person, and the ropes are firmly and reliably fixed.
The top protection casing mouth be equipped with the thread protection hoop, prevent the screw thread damage.
When the number of floating objects near the drilling ship and the protective sleeve is too much, the floating objects should be removed immediately.
The invention has the beneficial effects that: the deepwater area underwater drilling positioning method can enable deepwater area drilling positioning accuracy to meet the specification and design requirements, improves deepwater area drilling positioning accuracy, improves drilling quality, reduces time for frequently correcting ship positions, improves drilling efficiency, reduces engineering cost, and has the advantages of simplicity in operation, safety, convenience and high efficiency.
Drawings
The invention is further described with reference to the following figures and detailed description.
FIG. 1 is a schematic view of the anchor position of the drillship of the present invention;
fig. 2 is a schematic view of the lowering of the protective sleeve of the present invention.
In the figure, 1, a first main anchor, 2, a second main anchor, 3, a first front splayed anchor, 4, a second front splayed anchor, 5, a first rear splayed anchor, 6, a second rear splayed anchor, 7, a first drilling ship, 8, a second drilling ship, 9 and I-steel,
10. water flow direction, 11, a protective sleeve, 12, earholes, 13, a positioning rope, 14, a pressure reducing rope, 15, a safety rope, 16, an iron ring, 17 and a coupling.
Detailed Description
The technical scheme adopted by the method for positioning the underwater drill hole in the deep water area comprises the steps of assembling a drilling ship, anchoring the drilling ship, positioning the drilling ship and inserting a protective sleeve;
the assembly of the drillship comprises the following steps:
(1) selection of drillship: two motor-driven barge ships of 200-300 tons are selected and are refitted into a first drilling ship 7 and a second drilling ship 8, and the first drilling ship 7 and the second drilling ship 8 are connected together by six evenly distributed I-steel 9.
(2) Cutting a round hole with the diameter of 400-500 mm at the center of the middle front part of the deck of the first drilling ship 7 and the second drilling ship 8 and the bottom of the ship on the same vertical line, and firmly welding by using steel pipes with the same diameter to ensure water seepage resistance to be used as a channel of a drilling hole protection guide pipe.
(3) And mounting base wood on decks of the first drilling ship 7 and the second drilling ship 8, wherein the base wood is connected with the ship deck through screws, all wood boards with the thickness of 50mm are nailed and paved on the base wood, and railings with the height of 1.2m are erected around the base wood.
(4) The drill base is arranged at the middle front part of the first drilling ship 7 (or the second drilling ship 8) and is kept flat, the length and the width of a drill site are not less than 10m multiplied by 6m, tripod legs are seated on sleepers, and the first drilling ship 7 (or the second drilling ship 8) adopts a 10t winch and is arranged at the bow of the first drilling ship 7 (or the second drilling ship 8).
The anchoring of the drilling vessel comprises the following steps:
(1) before the anchoring, the maritime affairs and channel departments are informed to arrive at the site to command the safe passing of the passing ships; when the iron barge is anchored, an operator cannot stand within the range of the movement of the anchor rope and the anchor chain and has to wear a life jacket; after the drilling ship is anchored and positioned, a channel department is immediately informed to arrange a navigation mark around the drilling ship according to a plan so as to correctly set the navigation mark, and the ship is guided to run according to a specified route, so that sea damage accidents are avoided.
(2) The number of the dropped anchors is 6, a first main anchor 1 is arranged at the middle position of the bow of a first drilling ship 7, a second main anchor 2 is arranged at the middle position of the bow of a second drilling ship 8, the anchor rope of the first main anchor 1 and the anchor rope of the second main anchor 2 are consistent with the direction of 10 water flow, a first front splayed anchor 3 is arranged outside the bow of the first drilling ship 7, a second front splayed anchor 4 is arranged outside the bow of the second drilling ship 8, the included angle between the anchor rope of the first main anchor 1 and the anchor rope of the first front splayed anchor 3 is 35-45 degrees, the included angle between the anchor rope of the second main anchor 2 and the anchor rope of the second front splayed anchor 4 is 35-45 degrees, a first rear splayed anchor 5 is arranged outside the stern of the first drilling ship 7, a second rear splayed anchor 6 is arranged outside the stern of the second drilling ship 8, the included angle between the anchor rope of the first main anchor 1 and the anchor rope of the first rear splayed anchor 5 is 35 degrees, the included angle between the anchor rope of the second main anchor 2 and the anchor rope of the second rear splayed anchor 6 is 35-45 degrees.
(3) When the anchor is thrown, the iron anchor, the anchor chain and the anchor rope are firmly connected on the anchor throwing boat and are arranged in sequence, the first drilling boat 7 and the second drilling boat 8 self-navigate to a proper position at the upstream of a hole site, the first main anchor 1 and the second main anchor 2 are firstly thrown down, the first drilling boat 7 and the second drilling boat 8 slowly run downstream, the anchor rope is tied on a cable pile at a certain distance from the hole site, the anchor rope is slowly loosened on the cable pile, when the first drilling boat 7 and the second drilling boat 8 are closer to the hole site, the anchor rope is tied down, then the anchor throwing boat throws down the anchors one by one according to the sequence of the first front splayed anchor 3, the second front splayed anchor 4, the first rear splayed anchor 5 and the second rear splayed anchor 6.
The positioning of the drilling vessel comprises the following steps:
(1) before anchoring, a hole site reference mark is arranged on the shore, and when the first drilling ship 7 and the second drilling ship 8 are driven to the mark, RTK is used for accurate positioning.
(2) After each anchor is thrown, each anchor rope is tightly adjusted, the hole site is measured, and the anchor ropes are twisted tightly to stabilize the first drilling ship 7 and the second drilling ship 8.
(3) And a water gauge is arranged on the water side so as to observe the fluctuation of the water level at any time, the water level and the hole depth are corrected in the drilling process, and the error of the drilling hole position on the water is within 0.5 m.
(4) The boundary of the anchor rope close to the channel is marked according to the regulations, so that the accidents of hanging the boat and colliding the boat by the anchor rope are prevented.
The lower protective sleeve comprises the following steps:
(1) after the first drilling ship 7 and the second drilling ship 8 confirm the positioning stability, the protective sleeve 11 can be put in, the protective sleeve 11 is put in by adopting a single connection method, and the protective sleeves 11 to be put in are connected one by one according to the serial numbers and put in water until the planned depth is reached.
Furthermore, the pipe boots with the nails are used for the non-covering riverbed, the sleeve is prevented from sliding along the rock surface, the thick-wall sleeve with the diameter phi 219mm or phi 168mm is adopted as the protective sleeve, and the thick-wall sleeve with the diameter phi 168mm or phi 127 is adopted as the protective sleeve.
(2) When the protective sleeve 11 is used for lowering the pipe, the length of the first protective sleeve 11 is about 4m, when the river is deep, the number of the long protective sleeve 11 can be increased, when the river is shallow, the number of the long protective sleeve 11 is reduced, and the top of the long protective sleeve is provided with a short sleeve (with the length of 0.5 m-1.0 m) so as to facilitate the connection and disconnection of the river during the rising and falling, and the method comprises the following specific steps:
1) setting a safety rope: when the first protective sleeve 11 is put in, a movable iron ring 16 is sleeved below the top coupling 17, and a safety rope is fastened to be put into each protective sleeve 11, the movable iron ring 16 is sleeved, ear holes 12 of the iron ring 16 penetrate the safety rope 15 until the lower complete protective sleeve 11, and finally the safety rope 15 is fixed on a drill site, so that the protective sleeve 11 can be prevented from being lost if the protective sleeve 11 is broken.
2) Setting a positioning rope: the specification and length of the positioning ropes 13 are selected according to the water depth, the flow speed and the drawing position, two positioning ropes 13 are generally adopted and tied in the middle of the protective sleeve 11, the included angle between the positioning ropes and the horizontal plane is about 45 degrees, the positioning ropes 13 must penetrate through the bottom of the ship to be drawn upstream and fixed on the mooring bollard at the bow of the ship to adjust the verticality of the protective sleeve 11 and play a role in positioning the protective sleeve 11.
3) The positioning method of the protective sleeve: after the protective sleeve 11 is lowered to the bottom, the verticality can be corrected by a geological compass or a horizontal ruler, the positioning accuracy can be corrected by a vertical shaft drill rod, and the verticality of a pipe column must be ensured, and if the pipe column has deflection, the pipe column should be adjusted in time. If necessary, the protective sleeve 11 can be driven into the covering layer 3-5 m, but it is not too much to prevent the difficulty of pipe pulling.
4) When the wind is strong and the water level rises too fast, the drilling is stopped, the drilling tool is lifted out of the drilled hole, and the protective sleeve 11 is lengthened.
Furthermore, the safety rope 15 adopts a soft center steel wire rope with diameter phi of 12-15 mm.
Furthermore, the screw connection of the protective sleeve 11 must be secure, the person with weak connection must not be run into the water, and the screw should be put in place.
The orifice splint must be tightened to prevent the protective sleeve 11 from falling off.
The positioning rope 13, the safety rope 15 and the pressure reducing rope 14 are specially assigned to command with the specially assigned person, and the ropes are firmly and reliably fixed.
The top protection casing mouth be equipped with the thread protection hoop, prevent the screw thread damage.
When the floating objects near the drilling ship and the protective sleeve 11 are too much, the floating objects should be removed immediately.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (6)
1. A method for positioning underwater drilling in a deep water area is characterized by comprising the following steps: the method for positioning the underwater drill hole in the deep water area comprises the steps of assembling a drilling ship, anchoring the drilling ship, positioning the drilling ship and inserting a protective sleeve.
2. The method for positioning the underwater drill hole in the deep water area as claimed in claim 1, which is characterized in that: the assembly of the drillship comprises the following steps:
(1) selection of drillship: a 200-300 ton motor-driven barge is refitted into a drilling ship, and the two drilling ships are connected together by using six uniformly distributed I-shaped steel;
(2) cutting a circular hole with the diameter of 400-500 mm at the center of the middle front part of the drilling ship deck and the bottom of the ship on the same vertical line, firmly welding by using steel pipes with the same diameter, and ensuring water seepage resistance to be used as a channel of a drilling hole protection guide pipe;
(3) installing base wood on a deck of the drilling ship, wherein the base wood is connected with the deck of the ship through a screw, all wood boards with the thickness of 50mm are nailed and paved on the base wood, and railings with the height of 1.2m are erected around the base wood;
(4) the drilling machine base station is arranged at the middle front part of the drilling ship and keeps flat, the length and the width of a drilling field are not less than 10m multiplied by 6m, the tripod leg seat is arranged on a sleeper, and the drilling ship adopts a 10t winch and is arranged at the bow of the drilling ship.
3. The method for positioning the underwater drill hole in the deep water area as claimed in claim 1, which is characterized in that: the anchoring of the drilling vessel comprises the following steps:
(1) before the anchoring, the maritime affairs and channel departments are informed to arrive at the site to command the safe passing of the passing ships; when the iron barge is anchored, an operator cannot stand within the range of the movement of the anchor rope and the anchor chain and has to wear a life jacket; after the drilling ship is anchored and positioned, a channel department is immediately informed to arrange a navigation mark around the drilling ship according to a plan so as to correctly set the navigation mark, and the ship is guided to run according to a specified route, so that sea damage accidents are avoided;
(2) the number of the cast-off anchors is 5-9, the number of the front main anchors can be 1 or 2, the direction of the anchor rope is consistent with the direction of water flow, the number of the front splayed anchors is 2, the included angle between the main anchor rope and the front splayed anchor rope is 35-45 degrees on two sides of the bow of the ship, the number of the rear splayed anchors is 2, the included angle between the main anchor rope and the rear splayed anchor rope is 35-45 degrees on two sides of the stern of the drilling ship, further, a rear main anchor can be additionally arranged, and 1-2 side anchors can be respectively arranged on two sides of the drilling ship;
(3) when in anchoring, the iron anchor, the anchor chain and the anchor rope are firmly connected on the anchoring ship and are arranged in sequence, the drilling ship self-navigates to a proper position at the upstream of a hole site, the main anchor is firstly thrown down, the drilling ship slowly runs downstream, and the anchor rope is tied on the cable pile at a certain distance from the hole site;
slowly loosening anchor ropes on the mooring bollards, fastening the anchor ropes when the drill ship is closer to the hole site, throwing the anchor ship, and throwing the anchors one by one according to the sequence of front and rear splayed anchors and side anchors.
4. The method for positioning the underwater drill hole in the deep water area as claimed in claim 1, which is characterized in that: the anchoring of the drilling vessel comprises the following steps:
the positioning of the drilling vessel comprises the following steps:
(1) before anchoring, a hole site reference mark is arranged on the shore, and when the drilling ship is driven to the mark, RTK is used for accurate positioning;
(2) after each anchor is thrown, each anchor rope is tightly adjusted, the hole site is measured, and the anchor ropes are twisted tightly to enable the drilling ship to be stable;
(3) a water gauge is arranged on the water edge so as to observe the fluctuation of the water level at any time, the water level and the hole depth are corrected in the drilling process, and the error of the drilling hole position on the water is within 0.5 m;
(4) the boundary of the anchor rope close to the channel is marked according to the regulations, so that the accidents of hanging the boat and colliding the boat by the anchor rope are prevented.
5. The method for positioning the underwater drill hole in the deep water area as claimed in claim 1, which is characterized in that: the anchoring of the drilling vessel comprises the following steps:
the lower protective sleeve comprises the following steps:
(1) after the drilling ship confirms that the positioning is stable, the protective sleeves can be put in, the protective sleeve putting method adopts a single connection method, and the protective sleeves to be put in are connected one by one according to the numbers of the protective sleeves and put in water until the planned depth is reached;
(2) when protective case low tube, a protective case length is about 4m, and when the river was darker, several under the long protective case can be more, when the river was lighter, the long protective case should be less down, and nipple joint protective case (length 0.5m ~ 1.0 m) should be adopted at the top to connect the usefulness of unloading when the river rises and falls, concrete step is as follows:
1) setting a safety rope: when a first section of protective sleeve is put in, a movable iron ring is sleeved below a top coupling, a safety rope is tied, and when each section of protective sleeve is put in successively, the movable iron ring is sleeved to penetrate into the safety rope until the protective sleeve is completely put down, and finally the safety rope is fixed on a drill site;
2) setting a positioning rope: the specification and the length of the positioning ropes are selected according to the water depth, the flow rate and the pulling position, the two positioning ropes are generally tied at the middle part of the protective casing string, and the included angle between the two positioning ropes and the horizontal plane is about 45 degrees;
the positioning rope must penetrate through the bottom of the ship to be pulled upstream and is fixed on the mooring bollard at the bow of the ship so as to adjust the verticality of the protective sleeve and play a role in positioning the protective sleeve;
3) the positioning method of the protective sleeve: after the protective sleeve is lowered to the bottom, the verticality of the protective sleeve can be corrected by a geological compass or a horizontal ruler, the positioning accuracy is corrected by a vertical shaft drill rod, the verticality of the pipe column must be ensured, and if the pipe column has deflection, the pipe column should be adjusted in time;
if necessary, the protective sleeve can be driven into the covering layer for 3-5 m, but the driving is not too much, so that the difficulty in pipe pulling is avoided;
4) and if the wind is strong and the water level rises too fast, stopping drilling, lifting the drilling tool out of the drilled hole, and lengthening the protective sleeve.
6. The method for positioning the underwater drill hole in the deep water area as claimed in claim 5, which is characterized in that: the phi 219mm or phi 168mm thick-wall sleeve is adopted as the protective sleeve, and the phi 168mm or phi 127 thick-wall sleeve is adopted as the protective sleeve;
the safety rope adopts a phi 12-15 mm flexible center steel wire rope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911086477.5A CN110905411A (en) | 2019-11-08 | 2019-11-08 | Underwater drilling positioning method for deep water area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021232484A1 (en) * | 2020-05-19 | 2021-11-25 | 中交第四航务工程局有限公司 | Underwater positioning method for large-diameter ultra-long hdpe pipe |
| CN114198024A (en) * | 2021-11-02 | 2022-03-18 | 长江岩土工程有限公司 | Deep water drilling sleeve positioning device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104781140A (en) * | 2012-08-24 | 2015-07-15 | 斯坦纳·雷德里公司 | Method of mooring of ship and arrangement to accomplish the method |
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2019
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