CN114165162A - Construction method of ultra-long downward-penetrating directional drilling and pipe-pulling method - Google Patents
Construction method of ultra-long downward-penetrating directional drilling and pipe-pulling method Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 47
- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002002 slurry Substances 0.000 claims abstract description 88
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 15
- 239000000440 bentonite Substances 0.000 claims abstract description 15
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000002318 adhesion promoter Substances 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 4
- 239000000706 filtrate Substances 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 22
- 239000010881 fly ash Substances 0.000 claims description 22
- 229940092782 bentonite Drugs 0.000 claims description 12
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 229940080314 sodium bentonite Drugs 0.000 claims description 4
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000208682 Liquidambar Species 0.000 description 1
- 235000006552 Liquidambar styraciflua Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/26—Drilling without earth removal, e.g. with self-propelled burrowing devices
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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- Chemical & Material Sciences (AREA)
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Abstract
The invention relates to the field of pipeline construction, in particular to a construction method of an ultralong downward-penetrating directional drilling and pipe-pulling method, which comprises the following steps: A. measuring and paying off; B. leveling a field and building a sidewalk; C. equipment relocation and well site arrangement; D. system installation and debugging; E. measuring the magnetic orientation; F. drilling a guide hole; G. pre-reaming; H. back dragging the pipeline; I. equipment withdrawal, landform restoration and slurry treatment; the corresponding slurries were used at each stage of steps F-H: the slurry in the step F is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.2-0.4 part of additive and 0.3 part of filtrate reducer; the slurry in the step G is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter and 0.4 part of fluid loss additive; the slurry in the step H is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter, 0.4 part of fluid loss additive and 2-3 parts of lubricant. The scheme enables the slurry to be suitable for the construction of the directional drilling and pipe drawing method in the ultra-long distance.
Description
Technical Field
The invention relates to the field of pipeline construction, in particular to a construction method of an ultra-long downward-penetrating directional drilling and pipe-pulling method.
Background
The trenchless directional drilling machine mainly adopts an underground positioning system, and ensures that a drilling machine completes a guide hole according to a preset track through a guiding and grading reaming method, thereby achieving the purpose of accurately laying pipes.
The advantages of the trenchless directional drilling construction avoid the problems of large influence on traffic, surrounding buildings and underground pipelines, resource waste caused by large-area dismantling and recovering of pavements, houses and the like in the trenching construction, short construction period, effective avoidance of collapse and the like in the trenching construction of trenches with the buried depth of more than 4m, and accordingly the construction safety of operators and the like.
The slurry is very important in trenchless directional drilling and is one of the key factors of engineering success and failure, and the performance of the slurry has an influence on the quality of formed holes. The slurry is too thin, the slag discharge capacity is small, and the wall protection effect is poor; too thick slurry can weaken the impact function of the drill bit and reduce the drilling speed. The existing slurry is only suitable for the construction of the directional drilling and pipe drawing method in medium and short distance, but for the construction in ultra-long distance, the slurry is not suitable for the construction of the directional drilling and pipe drawing method in ultra-long distance because the slag discharge capability, the wall protection capability and the cooling capability of the slurry are limited.
In addition, among the prior art, when the pipeline drags back, the pipeline removes in the mud in the underground boring, mud in the underground boring can enter into the pipeline to cause the pipeline to lay the back that finishes, the pipeline is interior to block up and to have a large amount of mud, the later stage still needs additionally clear up the mud in the pipeline, because the pipeline is located underground boring, the mud washing in the pipeline is very inconvenient, need use cleaning equipment to take out or pump out mud from the pipeline during the clearance, still need extra installation cleaning equipment, it is very troublesome to operate.
Disclosure of Invention
The invention aims to provide a construction method of an ultra-long downward-penetrating directional drilling and pipe-pulling method, so that slurry can be suitable for construction of the ultra-long distance directional drilling and pipe-pulling method.
In order to achieve the purpose, the invention adopts the following technical scheme: the construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method comprises the following steps:
A. measuring and paying off;
B. leveling a field and building a sidewalk;
C. equipment relocation and well site arrangement;
D. system installation and debugging;
E. measuring the magnetic orientation;
F. drilling a guide hole;
G. pre-reaming;
H. back dragging the pipeline;
I. equipment withdrawal, landform restoration and slurry treatment;
the corresponding slurries were used at each stage of steps F-H:
the slurry in the step F is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.2-0.4 part of additive and 0.3 part of filtrate reducer;
the slurry in the step G is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter and 0.4 part of fluid loss additive;
the slurry in the step H is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter, 0.4 part of fluid loss additive and 2-3 parts of lubricant.
The principle and the advantages of the scheme are as follows: by adopting the slurry with the proportion, in the process of guiding drilling in the step F and pulling back and expanding the diameter of the drill rod in the step G, the slurry with the corresponding formula is injected through the drill rod in the practical application, so that the friction among the drill bit, the drill rod and the reamer can be reduced, the rotation torque and the pulling back resistance of the drill rod and the reamer can be reduced, and meanwhile, the slurry in the scheme also has the effects of wall fixation, hole soil collapse prevention and drill bit cooling.
In addition, the preparation of the slurry in the scheme is carried out according to different requirements of the slurry in different stages of the steps F-H, so that the performance index of the slurry can be timely adjusted according to the construction requirement, and the stability of the hole wall and the fluidity of the slurry are ensured.
Mud in the F stage in this scheme can carry downthehole silt as far as possible outside the hole, maintains the stability of pore wall simultaneously.
The mud in the G stage has a good wall protection effect, so that the stratum collapse is prevented, and the mud carrying capacity is improved.
The slurry in the H stage has good wall protection and sand carrying capacity, and simultaneously has good lubricating capacity, and can reduce friction resistance and torque of a drill rod and a reamer.
In conclusion, by the scheme, the slurry can be suitable for the construction of the ultra-long-distance directional drilling and pipe-pulling method, the stability of the construction of the ultra-long-distance directional drilling and pipe-pulling method is improved, and the construction of the ultra-long-distance directional drilling and pipe-pulling method is more smoothly carried out.
Preferably, as an improvement, the density of the slurry is 1.02-1.25g/cm3And the sand content is less than 0.5 percent. According to the scheme, the slurry is prepared according to the performance index range of the slurry, so that the slurry meets the use requirement. And the performance of the slurry can be enhanced under the performance index in the scheme, the fluidity and the suspension property of the slurry are ensured, the back-expansion hole forming effect is improved, and the wall protection capability of the slurry is fully improved.
Preferably, as an improvement, the bentonite is pre-hydrated sodium bentonite. The pre-hydrated sodium bentonite in the scheme has small and many silicate layers, and can enhance the swelling property of the slurry, thereby improving the fluidity of the slurry.
Preferably, as an improvement, in the step A, according to the position of a drawing, the center line, the soil-entering point and the soil-exiting point of the pipeline are determined by a theodolite, and the pipeline is marked by paint; and a settlement observation point is established around.
Preferably, as an improvement, in step F, the depth error range of the drill rod is controlled within ± 0.2m, and the axial deviation range is controlled within ± 0.3 m. Therefore, the accuracy of drilling the guide hole is ensured.
Preferably, as an improvement, in step F, a portable surface guide instrument is provided, and the position of the drill bit is measured every time 10cm is drilled in the deflecting section; in the tiled segment, the drill position was measured every 20 cm. From this, can in time monitor the advancing direction of drill bit, avoid the drill bit too big skew to appear.
Preferably, as an improvement, in the step H, before the pipeline is dragged back, an MPP pipe is externally hung on the pipeline, the length of the MPP pipe is equal to the length of the pipeline dragged back, a slurry nozzle is arranged on the MPP pipe, and when the pipeline is dragged back, the MPP pipe and the pipeline are dragged back together; and after the back dragging is finished, injecting cement fly ash slurry into the MPP pipe, spraying the cement fly ash slurry from a slurry nozzle, and enabling the cement fly ash slurry to flow between the pipeline and the hole wall. Therefore, for the section easy to settle, the cement fly ash slurry is injected into the gap between the pipeline and the hole wall along the MPP pipe and the slurry nozzle, so that the cement fly ash slurry is completely replaced by the slurry in the hole. The slurry in the gap between the pipeline and the hole wall is replaced by the cement fly ash slurry, so that the annular gap between the pipeline and the hole wall can be filled to the maximum extent, the pressure resistance of the hole wall is enhanced, and the collapse risk of the drilled hole is reduced to the maximum extent.
Preferably, as an improvement, the ratio of cement to fly ash slurry in the cement fly ash slurry is 1: 10. Therefore, the cement fly ash slurry with the proportion has better performance.
Preferably, as a modification, in step G, a plurality of pre-reamers are performed, and the diameter of each used reamer is gradually increased. From this, realized reaming grow gradually for the reaming in-process goes on smoothly, avoids the reaming in-process to cause the destruction to drilling.
Preferably, in step H, in the back dragging, a connector is connected between the reamer and the pipeline, the connector includes a plurality of coaxially detachably connected connecting portions, the diameter of the connecting portion from the end close to the reamer to the end close to the pipeline gradually increases, and one end of each connecting portion away from the reamer is a threaded end. The connector thereby enables connection of the reamer and the pipe. The threaded end is for connection to a pipe. The connecting part has a plurality of to a plurality of connecting parts are coaxial to be dismantled and connect, and the diameter of every connecting part is different, through dismantling the connecting part of different quantity or install like this for the connector is different size with the link of pipeline, thereby can connect the pipeline of different diameters. Simultaneously, the connector is used for plugging the end of the pipeline, and slurry in the hole is prevented from entering the pipeline in the back dragging process.
Drawings
Fig. 1 is a schematic structural diagram of a connector.
Fig. 2 is a left side cross-sectional view of the snap ring of fig. 1.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a rotating shaft 1, a first connecting part 2, a second connecting part 3, a third connecting part 4, a second control ring 5, a first control ring 6, a fixture block 7, a sliding block 8, a lock pin 9, a flange 10, a first groove body 11, a third groove body 12, a second groove body 13 and a pipeline 14.
Example 1
The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method comprises the following steps:
A. measuring and paying off; determining the center line, the soil entry point and the soil exit point of the pipeline by using a theodolite according to the position of a drawing, and marking by using spray paint; and a settlement observation point is established around. And measuring the central line of the line, arranging a plurality of encryption piles and underground barrier mark piles, and noting the names, burial depths and sizes of the barriers. After the central line of the line and the boundary line of the construction operation zone are determined, the central line of the pipeline and the boundary line of the operation zone are discharged by lime, and the soil entry point is drilled in a directional mode. Counting the obstacles in the operation belt in time after the paying-off is finished, and recording; and simultaneously, before the construction operation zone is cleaned, all the pipeline piles are translated to be within the occupied ground boundary line of the soil piling side and 0.3m away from the boundary.
B. Leveling a field and building a sidewalk; before construction, the construction site needs to reach the condition of 'tee joint one level': the sweetgum fruit, the water and the electricity are smooth and the operation area is smooth.
C. Equipment relocation and well site arrangement; the relevant equipment is moved to the place.
D. System installation and debugging; and after all the equipment enters a construction site, carrying out system installation. And after the system is installed and all the components are normal, performing system commissioning. Meanwhile, before the construction of drilling, the quality of drilling machines and tools such as a drill rod, a non-magnetic drill collar, a screw motor, a reamer, a cone, a shackle, a universal joint and the like is carefully checked, the screw thread is cleaned, and the damage to the interior is ensured.
E. Measuring the magnetic orientation; the magnetic azimuth angle is used as the most important direction control data of the directional drilling and crossing project, therefore, before the pilot hole is drilled, the measurement of the magnetic azimuth angle crossing the central line needs to be made carefully, and the value is the original basis value of the direction control of the pilot hole and must be accurate. The total station is used for determining the correct magnetic azimuth value by measuring the earth surface at multiple points (generally, two points are taken at the exit side and the entry side respectively) on the crossing center line, then analyzing and comparing each group of data, and eliminating the data which are wrong due to magnetic interference. If the sets of data differ significantly (above 0.2 deg.), the measurement points are increased (2-4) until the correct value is determined.
F. Drilling a guide hole; a pilot hole is drilled using a drill, drill rod and drill bit. The depth error range of the drill rod is controlled within +/-0.2 m, and the axial deviation range is controlled within +/-0.3 m. Meanwhile, a portable earth surface guide instrument is equipped, and the position of the drill bit is measured once every 10cm of drilling in the deflecting section; in the tiled segment, the drill position was measured every 20 cm.
G. Pre-reaming; and after the drill bit is accurately unearthed, the drilling tool is disassembled and the reamer is connected. And (4) performing pre-reaming for multiple times, wherein the diameter of the reamer used each time is gradually increased. Specifically, in the present embodiment, 6 pre-chambering operations are adopted; the first level adopts 400mm enlarger reaming, and the second level adopts 550mm enlarger reaming, and the third level adopts 700mm enlarger reaming, and the fourth level adopts 850mm enlarger reaming, and the fifth level adopts 950mm enlarger reaming, and the sixth level adopts 1080mm enlarger reaming.
H. Back dragging the pipeline; and connecting the drilling machine, the drill rod, the reamer, the connector and the pipeline, and then performing back dragging operation. If the whole back dragging section contains an easy-to-settle section, before the pipeline back dragging, an MPP pipe with the diameter of 30m is externally hung on the pipeline, the length of the MPP pipe is equal to the length of the back dragging pipeline, a slurry nozzle is arranged on the MPP pipe, and when the pipeline back dragging, the MPP pipe and the pipeline carry out back dragging together; and after the back dragging is finished, injecting cement fly ash slurry into the MPP pipe, spraying the cement fly ash slurry from a slurry nozzle, and enabling the cement fly ash slurry to flow between the pipeline and the hole wall. The ratio of cement to fly ash mortar in the cement fly ash slurry is 1: 10.
I. Equipment withdrawal, landform restoration and slurry treatment.
And F-H, injecting slurry into the hole at each stage, wherein the slurry used at each stage is as follows:
the slurry in the step F is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.2-0.4 part of additive and 0.3 part of filtrate reducer;
the slurry in the step G is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter and 0.4 part of fluid loss additive;
the slurry in the step H is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter, 0.4 part of fluid loss additive and 2-3 parts of lubricant.
The density of the slurry in this example is 1.02-1.25g/cm3The sand content is less than 0.5% (weight ratio). The bentonite is pre-hydrated sodium bentonite. The additive is caustic soda or sodium carbonate.
The mud performance parameters in this example are shown in table 1:
TABLE 1
In the actual process of preparing the slurry, the viscosity value of the slurry is determined according to different geological conditions, and in this embodiment, the viscosity value is determined by selecting the parameters shown in table 2:
TABLE 2
In the embodiment, by adopting the slurry, the slurry can be suitable for the construction of the ultra-long distance directional drilling and pipe drawing method, the stability of the construction of the ultra-long distance directional drilling and pipe drawing method is improved, and the construction of the ultra-long distance directional drilling and pipe drawing method is more smoothly carried out.
Meanwhile, for the construction section containing the easy-settling section, after the pipeline is dragged back, the cement fly ash slurry is injected into the gap between the pipeline and the hole wall along the MPP pipe and the slurry nozzle, so that the cement fly ash slurry is completely replaced by the slurry in the hole. The slurry in the gap between the pipeline and the hole wall is replaced by the cement fly ash slurry, so that the annular gap between the pipeline and the hole wall can be filled to the maximum extent, the pressure resistance of the hole wall is enhanced, the collapse risk of drilling is reduced to the maximum extent, and the stability of the construction of the directional drilling and pipe drawing method of the ultra-long distance is improved.
Example 2
Substantially as shown in figures 1-2 of the accompanying drawings: when the reamer drags back, a connector is connected between the reamer and the pipeline 14, the connector comprises a plurality of coaxial connecting parts which can be detachably connected, the number of the connecting parts in the embodiment is three, the connecting parts are respectively a first connecting part 2, a second connecting part 3 and a third connecting part 4, the diameters of the first connecting part 2, the second connecting part 3 and the third connecting part 4 are sequentially increased, the left end of the first connecting part 2 is rotatably connected with a rotating shaft 1 through a bearing, and the rotating shaft 1 is connected with the reamer through a bolt. The first connecting portion 2, the second connecting portion 3 and the third connecting portion 4 are all cylindrical, and the right end of the first connecting portion 2, the right end of the second connecting portion 3 and the right end of the third connecting portion 4 are all provided with internal threads, and the internal threads are used for being connected with the end portion of the pipeline 14, such as the right end of the third connecting portion 4 and the left end of the pipeline 14 in fig. 1. Can dismantle between first connecting portion 2 and the second connecting portion 3, between second connecting portion 3 and the third connecting portion 4 and be connected, specific connection mode of dismantling is: a first control ring 6 for controlling whether the first connecting part 2 and the second connecting part 3 are connected is connected between the first connecting part 2 and the second connecting part 3, and the first control ring 6 is sleeved and rotatably connected on the left end of the second connecting part 3; be connected with between second connecting portion 3 and the third connecting portion 4 and be used for controlling second connecting portion 3 and the second control ring 5 that third connecting portion 4 is connected, second control ring 5 overlaps and rotates and connect on the left end of third connecting portion 4, uses second connecting portion 3 and third connecting portion 4 as the example and specifically explains the dismantled relation of connection of second connecting portion 3 and third connecting portion 4: an annular flange 10 is integrally formed at the right end of the second connecting part 3, a clamping block 7 is welded on the inner wall of the third connecting part 4, the clamping block 7 abuts against the right side face of the flange 10, a plurality of through holes uniformly distributed in the circumference are formed in the side wall of the left end of the third connecting part 4, locking pins 9 are all connected in the through holes in a sliding mode along the radial direction of the third connecting part 4, a sliding block 8 is welded at one end, away from the second connecting part 3, of each locking pin 9, a plurality of sliding grooves uniformly distributed in the circumference are formed in the second control ring 5, the sliding block 8 is clamped in each sliding groove, and the sliding block 8 can slide in each sliding groove; as shown in fig. 2, the sliding grooves of the second control ring 5 each include a first groove 11, a second groove 13, and a third groove 12, the second groove 13 is connected between the first groove 11 and the second groove 13, the first groove 11 is close to the center of the first control ring 6, and the third groove 12 is far away from the center of the first control ring 6. The second control ring 5 is provided with a sliding cavity which enables the lock pin 9 to slide, the sliding cavity is positioned on one side of the sliding groove close to the center of the second control ring 5, and the sliding cavity is communicated with the sliding groove. The end of the sliding cavity close to the third groove body 12 is larger than the end of the sliding cavity close to the first groove body 11. The number of the slide grooves and the number of the lock pins 9 in this embodiment are six. The locking pin 9 abuts against the left side of the flange 10. The left end of the first connection portion 2 is sealed. The latch 7 is annular.
The specific implementation process is as follows: the connector thus enables connection of the reamer to the pipe 14. The threaded end is for connection to a pipe 14. The shaft 1 is used for being connected with a reamer, and the left end part of the pipeline 14 is plugged by connecting the pipeline 14 to the third connecting part 4 through the whole connector, so that slurry in a hole is prevented from entering the pipeline 14 in the back dragging process.
Because the first connecting part 2, the second connecting part 3 and the third connecting part 4 are detachably connected, and the diameters of the first connecting part 2, the second connecting part 3 and the third connecting part 4 are different, when the first connecting part 2, the second connecting part 3 and the third connecting part 4 are connected together, the pipeline 14 is connected at the right end of the third connecting part 4, and the connector can be connected with the pipeline 14 with a larger pipe diameter. When the third connecting portion 4 is detached, the connector can be connected to the pipe 14 having a pipe diameter of one size smaller by connecting the pipe 14 to the right end of the second connecting portion 3. When the second connecting part 3 is continuously removed, the connector can be connected with the pipeline 14 with smaller diameter by connecting the pipeline 14 with the right end of the first connecting part 2. Thus, by this scheme, the connector can be connected with pipes 14 of different pipe diameters.
When third connecting portion 4 need be dismantled, rotate second control ring 5, second control ring 5 rotates the in-process, and during slider 8 slided third cell body 12 in second cell body 13 from first cell body 11, slider 8 drove lockpin 9 and kept away from flange 10, and lockpin 9 no longer blocks flange 10, can take off third connecting portion 4 from second connecting portion 3 this moment. When the third connecting portion 4 is mounted on the second connecting portion 3, the flange 10 of the second connecting portion 3 is abutted to the fixture block 7, the second control ring 5 rotates reversely, the sliding block 8 slides into the first groove body 11 from the third groove body 12 through the second groove body 13, the sliding block 8 drives the lock pin 9 to be close to the flange 10, the lock pin 9 clamps the flange 10, the third connecting portion 4 is mounted on the second connecting portion 3 at the moment, and the second connecting portion 3 and the third connecting portion 4 cannot be separated. Similarly, the second connecting portion 3 and the first connecting portion 2 are removed and installed in a manner similar to that described above, and are not described in detail herein.
Through rotating first control ring 6, second control ring 5 in this scheme, alright realize the quick dismantlement and the installation of first connecting portion 2 and second connecting portion 3 respectively, realized the dismantlement and the installation of second connecting portion 3 and third connecting portion 4, compare and use a plurality of bolts to connect, the dismouting is more convenient. Meanwhile, threaded connection modes are not adopted between the first connecting portion 2 and the second connecting portion 3 and between the second connecting portion 3 and the third connecting portion 4, so that the first connecting portion 2 and the second connecting portion 3 and the third connecting portion 4 cannot be loosened even if relative rotation occurs, and connection between the first connecting portion 2 and the second connecting portion and connection between the second connecting portion 3 and the third connecting portion 4 are firm and stable. In addition, this scheme is through setting up the connecting portion of a plurality of different internal diameters, and the diameter of pivot 1 is also less than the diameter of first connecting portion 2 simultaneously, makes the diameter that the one end of pipeline 14 was kept away from to the connector less like this, and the connector is in the removal in-process, is favorable to reducing the resistance of removal like this, removes can be more smooth and easy.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method is characterized by comprising the following steps: the method comprises the following steps:
A. measuring and paying off;
B. leveling a field and building a sidewalk;
C. equipment relocation and well site arrangement;
D. system installation and debugging;
E. measuring the magnetic orientation;
F. drilling a guide hole;
G. pre-reaming;
H. back dragging the pipeline;
I. equipment withdrawal, landform restoration and slurry treatment;
the corresponding slurries were used at each stage of steps F-H:
the slurry in the step F is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.2-0.4 part of additive and 0.3 part of filtrate reducer;
the slurry in the step G is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter and 0.4 part of fluid loss additive;
the slurry in the step H is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of adhesion promoter, 0.4 part of fluid loss additive and 2-3 parts of lubricant.
2. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 1, characterized in that: the density of the slurry is 1.02-1.25g/cm3And the sand content is less than 0.5 percent.
3. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 1, characterized in that: the bentonite is pre-hydrated sodium bentonite.
4. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 1, characterized in that: in the step A, according to the position of a drawing, determining the center line of the pipeline, the position of an earth entering point and the position of an earth leaving point by using a theodolite, and marking by using spray paint; and a settlement observation point is established around.
5. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 4, characterized in that: and F, controlling the depth error range of the drill rod within +/-0.2 m, and controlling the axial deviation range within +/-0.3 m.
6. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 5, characterized in that: step F, a portable earth surface guide instrument is equipped, and the position of the drill bit is measured once every 10cm of drilling in the deflecting section; in the tiled segment, the drill position was measured every 20 cm.
7. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 6, characterized in that: step H, externally hanging an MPP pipe on the pipeline before dragging the pipeline back aiming at the easy settling section, wherein the length of the MPP pipe is equal to the length of the pipeline dragging back, a slurry nozzle is arranged on the MPP pipe, and when the pipeline drags back, the MPP pipe and the pipeline drag back together; and after the back dragging is finished, injecting cement fly ash slurry into the MPP pipe, spraying the cement fly ash slurry from a slurry nozzle, and enabling the cement fly ash slurry to flow between the pipeline and the hole wall.
8. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 7, characterized in that: the ratio of cement to fly ash mortar in the cement fly ash slurry is 1: 10.
9. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 8, characterized in that: and G, pre-reaming for multiple times, wherein the diameter of the reamer used each time is gradually increased.
10. The construction method of the ultra-long downward-penetrating directional drilling and pipe-pulling method according to claim 9, characterized in that: and step H, when the pipe is pulled back, a connector is connected between the reamer and the pipeline, the connector comprises a plurality of connecting parts which are coaxially detachably connected, the diameter of the connecting part close to the reamer is gradually increased to the diameter of the connecting part close to the pipeline, and one end, far away from the reamer, of each connecting part is a threaded end.
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| US4401170A (en) * | 1979-09-24 | 1983-08-30 | Reading & Bates Construction Co. | Apparatus for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein |
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