CN111206886A - Drill string suspension method for ocean deep drilling operation - Google Patents
Drill string suspension method for ocean deep drilling operation Download PDFInfo
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- CN111206886A CN111206886A CN202010058550.4A CN202010058550A CN111206886A CN 111206886 A CN111206886 A CN 111206886A CN 202010058550 A CN202010058550 A CN 202010058550A CN 111206886 A CN111206886 A CN 111206886A
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- hydraulic elevator
- stand
- top drive
- drill
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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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
- E21B19/06—Elevators, i.e. rod- or tube-gripping devices
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a drill string suspension method for ocean deep drilling operation, which comprises the following steps: step 1: arranging a stand and a temporary connecting drill rod in the well; step 2: the ground hydraulic elevator clamps the stand to fixedly suspend the stand; and step 3: lowering the top drive hydraulic elevator to a low position, and buckling the temporary connection drill rod; and 4, step 4: lifting a top drive hydraulic elevator, loosening the ground hydraulic elevator after being stressed, and moving the ground hydraulic elevator away from a well mouth; and 5: lifting the vertical root by the top drive hydraulic elevator; step 6: after the upper joint of the drill rod at the uppermost end of the stand is lifted to a corresponding height, the ground hydraulic elevator is moved in again and the stand joint is clamped; and 7: the top drive hydraulic elevator is lowered to release the weight of the drill string, and the ground hydraulic elevator bears the weight; and 8: the top drive hydraulic elevator lifts the upright post. The invention improves the bearing capacity of the drill stem, changes the bearing point, solves the problem of switching the power elevator, reduces the damage of the slip clamping to the drill stem and solves the problem of difficult screwing.
Description
Technical Field
The invention relates to the technical field of ocean drill string suspension methods, in particular to a drill string suspension method for ocean deep drilling operation.
Background
The ocean (ocean) drilling operation is mainly a vertical well, the coring is mainly in a rope coring mode, in order to meet the requirement of the rope coring, a large-caliber drilling tool is usually adopted for the drilling and coring operation, in order to drill through a morse surface, the dream of geoscientists is realized, the vertical depth of a drilled well can reach 11000 meters, and the weight of the whole drilling tool exceeds 450 tons. In the operation condition of deep drilling in deep water in the sea area, great challenges are provided for a drilling tool suspension method and a drilling tool every time the drilling tool is tripped out and drilled, and the two suspension methods of a slip type and a hydraulic double-lifting-block switching type are used at present, but the two methods cannot meet the requirements of efficient and safe deep drilling operation.
For the slip mode, slips with three conical surfaces are used for suspension, slip teeth are distributed on the inner wall of the slip, and the slip teeth are used for clamping a drill string to realize drill string suspension, so that the slip is usually applied to conventional oil and gas drilling. Because in the drilling of ocean deep, the drilling string is very heavy, leads to the horizontal strength that receives of drilling string very big to make slips to produce darker tooth trace to the drilling string, adopt the slips mode for a long time, the tooth trace is more and more dark, shortens the life of drilling string, can destroy the drilling string even.
The manual double-elevator mode is usually applied to land drilling operation, the double-hand elevator is adopted, although the bearing capacity is greatly improved, the joint can be protected, but the current manual double-elevator mode can only adapt to a land drilling machine with low land automation, and the manual double-elevator mode can not be used on the current automatic offshore platform and drilling ship by means of the land drilling machine and the cooperation of the manual double-elevator mode. However, like the japanese geodetic drillship, the hydraulic double-elevator mode is adopted, but the hydraulic pipeline and the elevator need to be switched every time the drillship is lowered and the connecting column is connected, so that the joint faults are more, hydraulic oil leakage is easily caused, and the elevator switching efficiency is lower. Meanwhile, the double elevators are used, so that the joint is low in position and needs to be provided with a special fastening tool. Therefore, no drill string suspension method which can be well adapted to deep sea drilling operation exists at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a drill string suspension method for ocean deep drilling operation, which can solve the problem of drill string suspension for ocean drilling operation.
The technical scheme for realizing the purpose of the invention is as follows: a drill string suspension method for ocean deep drilling operation comprises the following steps:
step 1: the well is composed of vertical roots and temporary connection drill rods, each vertical root is composed of at least three drill rods, the drill rods are sequentially connected end to end, and the uppermost end of each vertical root is pre-connected with one temporary connection drill rod;
step 2: the ground hydraulic elevator clamps the stand to fixedly suspend the stand, and is positioned on the turntable;
and step 3: the top drive hydraulic elevator is lowered to a low position, and the temporary connection drill rod at the top of the stand is buckled through the top drive hydraulic elevator;
and 4, step 4: lifting the top drive hydraulic elevator, after the top drive hydraulic elevator is stressed, loosening the ground hydraulic elevator, and loosening the stand from the ground hydraulic elevator;
and 5: after the ground hydraulic elevator is moved away, the hydraulic elevator is driven by the top to lift the stand;
step 6: after the upper joint of the drill rod at the uppermost end of the stand is lifted to a corresponding height, the ground hydraulic elevator is moved into the wellhead again, and the stand joint is clamped again through the ground hydraulic elevator:
and 7: after the top drive hydraulic elevator is lowered to release the weight of the drill string, the drill rod joint is disassembled after the ground hydraulic elevator is stressed;
and 8: and lifting the upright column by the top drive hydraulic elevator, opening the hydraulic elevator after the pipe racking machine grabs the drill pipe, and moving the upright column to the stand box for storage.
Further, after the step 8, the method further comprises the following steps: and (4) lowering the top drive hydraulic elevator again to the corresponding height capable of clamping the stand after the top drive hydraulic elevator is opened, clamping the next stand, and repeating the steps 3-8 to pull out the drill.
The invention has the beneficial effects that: 1. the temporary connection mode of the drill rod is used, so that the bearing capacity of the drill column is improved, the bearing point is changed, and the problem of switching the power elevator is solved;
2. the drill string is supported and clamped by a ground elevator mode, so that the damage of the conventional power slip and manual slip to the drill string is reduced;
3. the rail type power elevator is used, so that the automation of the system is improved, the safety system is increased, and the working efficiency is improved;
4. the problem that the connector is too low and difficult to buckle due to the fact that the double lifting clamps are arranged can be solved.
Drawings
FIGS. 1-6 are schematic views of various states of the suspension process of the present invention;
wherein, the device comprises a lifting ring 1, a top drive hydraulic elevator 2, a ground hydraulic elevator 3, a sliding frame 4 and a turntable 5.
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1 to 6, a drill string suspension method for offshore deep drilling operation comprises the following steps:
step 1: the vertical root and the temporary connection drill rod are arranged in the well, the short drill rod is pre-connected to the uppermost end (namely the top) of the vertical root, the vertical root which is pre-connected with the short drill rod is vertically stored in a storage area of the derrick, the derrick is located right above a well head of the operation well, the length of the short drill rod is usually smaller than that of the drill rod, and the short drill rod can be pre-connected to the top of the vertical root in a thread buckling mode. A stand is usually formed by connecting at least 3-4 drill rods in sequence. The drill rod comprises a rod body, a male joint and a female joint, wherein the male joint and the female joint are respectively arranged at two ends of the rod body and are respectively marked as an upper joint and a lower joint, and the upper end and the lower end of the current drill rod can be respectively connected with another drill rod through the male joint and the female joint, so that the drill rods are sequentially connected to form a stand. The short drill rod is also used as a temporary connection drill rod, the structure of the short drill rod is the same as that of the drill rod, the length of the short drill rod is shorter, and the temporary connection drill rod plays a role in temporarily connecting and hoisting the drill rods.
Step 2: the stand on the derrick is moved to the position above a well head through a pipe arranging machine, the stand is conveyed into a well after penetrating through a rotary table 5 arranged on the well head, and then the stand is clamped through a ground hydraulic elevator 3 arranged on the rotary table 5 so as to fixedly suspend the stand to support the weight of the stand.
And step 3: the top drive hydraulic elevator 2 connected with the top drive through the lifting ring 1 is used for buckling a short drill pipe at the top of the stand, the top drive hydraulic elevator 2 is lifted, after the top drive hydraulic elevator 2 is stressed, the ground hydraulic elevator 3 is loosened, the stand is loosened from the ground hydraulic elevator 3, the ground hydraulic elevator 3 is moved to a safe area, the ground hydraulic elevator 3 is moved to other places from a rotary table 5 above a wellhead, and the ground hydraulic elevator 3 can be moved to the safe area through the sliding frame 4. After the ground hydraulic elevator 3 is moved away, the top drive hydraulic elevator 2 lifts the vertical root, and the vertical root is drilled down until the height of the upper joint of the drill rod at the uppermost end of the vertical root from the rotary table 5 is within a preset height range, the drilling down is stopped, the preset height is usually set to be 150CM (centimeter), namely the top drive hydraulic elevator 2 is placed down to a low position, and the top drive hydraulic elevator 2 is used for buckling the temporarily connected drill rod at the top of the vertical root.
And 4, step 4: after the upper joint of the uppermost drill rod of the stand is lifted to a corresponding height, the ground hydraulic elevator 3 is moved into the rotary table 5 above the wellhead again, and the stand is clamped again through the ground hydraulic elevator 3, namely the stand is buckled through the ground hydraulic elevator 3. And then, releasing the weight by the top drive, and opening the top drive hydraulic elevator 2 to separate the current stand from the top drive hydraulic elevator 2, namely, after the top drive hydraulic elevator 2 is lowered to release the weight of the drill string, and after the ground hydraulic elevator 3 is stressed, detaching the drill rod joint, and the current stand is drilled and driven into the well. The top drive hydraulic elevator 2 is lifted to a corresponding height capable of clamping a stand again after being opened, the next stand is clamped, the top drive hydraulic elevator 2 lifts the stand column, the pipe racking machine grabs the drill pipe, the top drive hydraulic elevator 2 is opened, the pipe racking machine moves the stand column to the stand column box for storage, and then the steps are repeated for drilling.
In order to implement the above-mentioned drill string suspension method, a corresponding drill string suspension system is required, as shown in fig. 1-6, and fig. 1-6 are the process of the drill string suspension step. The drill string suspension system comprises a top drive, a top drive hydraulic elevator 2, a ground hydraulic elevator 3, a rotary table 5 and a sliding frame 4, wherein the rotary table 5 is used as a drilling platform surface for drilling operation, the rotary table 5 is directly laid and fixed above a well head, the sliding frame 4 is arranged on the rotary table 5, the ground hydraulic elevator 3 is directly arranged on the sliding frame 4, the sliding frame 4 is used for moving the ground hydraulic elevator 3, so that the ground hydraulic elevator 3 is close to and far away from the well head, and the ground hydraulic elevator 3 can clamp and release a stand which passes through the well head. The top of carousel 5 is provided with the top and drives hydraulic elevator 2, drives hydraulic elevator 2 on the top and drives through rings 1 with the top and be connected, drives hydraulic elevator 2 on the top and is used for the centre gripping and draws the grudging post, and the top is driven and is used for driving hydraulic elevator 2 through the top and bores the grudging post to the well in.
The invention uses a short drill rod mode, improves the bearing capacity of the drill column, changes the bearing point and solves the problem of switching the hydraulic elevator. The existing double-elevator lifting and drilling mode is that a ground hydraulic elevator and a top drive hydraulic elevator are alternately used, and when the elevators are switched, lifting rings and hydraulic elevator oil pipes need to be detached, so that the operation is complex. After the short drill rod is adopted, the top drive hydraulic elevator is special for top drive, and the ground hydraulic elevator is special for the rotary table of the drilling floor, so that switching is not needed.
The invention uses a ground elevator mode to support and clamp the drill stem, and reduces the damage of the conventional power slip and manual slip to the drill stem. And adopt the slips centre gripping drilling rod, the action point is at the drilling rod body of rod, through the horizontal extrusion of slips and the body of rod, produces fore-and-aft frictional force and bears the weight of drilling rod, and drilling rod weight is big more, and horizontal extrusion force is big more, leads to the slips to inlay the drilling rod body of rod, damages the drilling rod. The hydraulic elevator is internally provided with a conical surface which is matched with the conical surface between the drill rod joint and the rod body, the acting point is arranged at the conical surface of the joint, the weight of the drill rod is supported by the conical surface, the contact area is large, and the drill rod cannot be damaged.
The invention uses the rail type power elevator, improves the system automation, increases the safety system and improves the working efficiency.
The invention can solve the problems of over-low joint and difficult buckling caused by double lifting clamps. The distance between the drill rod thread position needing to be disassembled and the drill floor rotary table is only the height of the elevator body, the joint position is low, and the drill rod thread screwing and unscrewing equipment commonly used for ocean drilling is high, so that the operation is inconvenient. After the short drill rod is adopted, the distance between the drill rod thread position to be disassembled and the drill rod rotary disc surface is the height of the elevator body and the length of the short drill rod body, the joint position is high, and the operation of equipment for screwing and disassembling threads is facilitated.
The embodiments disclosed in this description are only an exemplification of the single-sided characteristics of the invention, and the scope of protection of the invention is not limited to these embodiments, and any other functionally equivalent embodiments fall within the scope of protection of the invention. Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (2)
1. A drill string suspension method for offshore deep drilling operation is characterized by comprising the following steps:
step 1: arranging stand columns and temporary connection drill rods in the well, wherein each stand column at least comprises three drill rods, the drill rods are sequentially connected end to end, and the uppermost end of each stand column is pre-connected with one temporary connection drill rod;
step 2: the ground hydraulic elevator clamps the stand to fixedly suspend the stand, and is positioned on the turntable;
and step 3: the top drive hydraulic elevator is lowered to a low position, and the temporary connection drill rod at the top of the stand is buckled through the top drive hydraulic elevator;
and 4, step 4: lifting the top drive hydraulic elevator, after the top drive hydraulic elevator is stressed, loosening the ground hydraulic elevator, and loosening the stand from the ground hydraulic elevator;
and 5: after the ground hydraulic elevator is moved away, the hydraulic elevator is driven by the top to lift the stand;
step 6: after the upper joint of the drill rod at the uppermost end of the stand is lifted to a corresponding height, the ground hydraulic elevator is moved into the wellhead again, and the stand joint is clamped again through the ground hydraulic elevator;
and 7: after the top drive hydraulic elevator is lowered to release the weight of the drill string, the drill rod joint is disassembled after the ground hydraulic elevator is stressed;
and 8: and lifting the upright column by the top drive hydraulic elevator, opening the hydraulic elevator after the pipe racking machine grabs the drill pipe, and moving the upright column to the stand box for storage.
2. The method of claim 1, further comprising, after step 8, the steps of: and (4) lowering the top drive hydraulic elevator again to the corresponding height capable of clamping the stand after the top drive hydraulic elevator is opened, clamping the next stand, and repeating the steps 3-8 to pull out the drill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058550.4A CN111206886A (en) | 2020-01-17 | 2020-01-17 | Drill string suspension method for ocean deep drilling operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058550.4A CN111206886A (en) | 2020-01-17 | 2020-01-17 | Drill string suspension method for ocean deep drilling operation |
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| CN111206886A true CN111206886A (en) | 2020-05-29 |
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| CN202010058550.4A Pending CN111206886A (en) | 2020-01-17 | 2020-01-17 | Drill string suspension method for ocean deep drilling operation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227983A (en) * | 2020-10-20 | 2021-01-15 | 中国地质科学院勘探技术研究所 | Method for lifting and lowering drilling tool by using double lifting clamps |
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| CN112227983A (en) * | 2020-10-20 | 2021-01-15 | 中国地质科学院勘探技术研究所 | Method for lifting and lowering drilling tool by using double lifting clamps |
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Application publication date: 20200529 |
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