CN112253023A

CN112253023A - System device for coring and drilling in deep lake

Info

Publication number: CN112253023A
Application number: CN202011251304.7A
Authority: CN
Inventors: 王君波; 黄卫东
Original assignee: Qinghai Jingcheng Geology And Mineral Co ltd; Institute of Tibetan Plateau Research of CAS
Current assignee: Qinghai Jingcheng Geology And Mineral Co ltd; Institute of Tibetan Plateau Research of CAS
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-01-22

Abstract

The invention discloses a system device for coring and drilling in deep lakes, which comprises an above-water working platform, a propulsion system, an anchoring system, a casing system and a drilling system. Compared with the prior art, the overwater working platform of the device is reasonable in structure, the structural clearance can effectively disperse and reduce the horizontal thrust generated by stormy waves, the stress is balanced, the dead weight is light, and the device is safe and reliable; the anchoring system of the device has stronger anchoring capability; the casing system of the device can be self-righting to counteract and balance the downward bending, inclination and lodging forces generated by the casing due to self weight, so that the casing can be always kept in a vertical and stable state in water, particularly in deep water; the casing system can also be docked with or undocked from the above-water working platform in real time to avoid the displacement of the drilling working platform system from affecting the stability of the casing.

Description

System device for coring and drilling in deep lake

Technical Field

The invention relates to the technical field of water drilling, in particular to a system device for coring and drilling in deep lakes.

Background

The deep lake underwater coring drilling work is different from land drilling and is characterized in that: lake water depth (usually water depth is more than 30 meters), large wind and wave (maximum wind power is 7-8 grades), lake bottom sludge thickness (usually more than 4 meters), common sand layer and sandy gravel layer of stratum encountered by drilling at lake bottom, and casing protection wall is usually needed. For example, when the offshore core drilling work is carried out on a deep-water lake in a Tibet Namu lake, the offshore drilling construction point is positioned about 8 kilometers from the center of the lake to the nearest lake bank, the water depth of the construction point is 94.5 meters, the thickness of sludge at the bottom of the lake is 4-5 meters, the maximum wind power is 7 grades during construction, and the stratum encountered by drilling at the bottom of the lake is a sand layer and a sandy gravel layer.

At present, the land coring drilling technology in China is mature. However, the coring drilling technology for drilling on water, particularly deep lakes, is not mature, and the problems are represented as follows: safe and applicable deepwater lake drilling overwater working platform and a matched anchoring system device thereof, and corresponding anchor sending and anchoring technology and system device are not available; a safe and reliable deep water casing centralizing and anti-displacement system device of the casing top relative to a working platform is not available.

Disclosure of Invention

The invention aims to provide a system device for coring and drilling in deep lakes, which is used for solving the technical problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme:

the invention discloses a system device for coring and drilling in a deep lake, which comprises an overwater working platform, a propulsion system, an anchoring system, a drilling system and a sleeve system, wherein the propulsion system, the anchoring system and the drilling system are arranged on the overwater working platform, the drilling system comprises a drilling machine and a drill rod, the sleeve system is sleeved outside the drill rod, the sleeve system comprises a slurry circulation connecting pipe, a top loose joint sleeve, a sleeve butt joint taper sleeve, a floating body, a deep water sleeve assembly structure and a scurrying and water blocking prevention device, the bottom end of the top loose joint sleeve is detachably connected with the top end of the deep water sleeve assembly structure through the sleeve butt joint taper sleeve, the sleeve butt joint taper sleeve comprises an upper taper sleeve fixed at the bottom end of the top loose joint sleeve and a lower taper sleeve fixed at the upper end of the deep water sleeve assembly structure, the outer conical surface of the upper taper sleeve can be attached to the outer conical surface of the lower taper sleeve, the anti-moving and water-blocking device is fixed at the bottom of the deep water casing pipe assembly structure, the slurry circulating connection pipe is communicated with the top loose joint casing pipe, and the floating body is fixed at the outer side of the deep water casing pipe assembly structure.

Preferably, the deepwater casing combined structure comprises an upper small-diameter casing and a lower large-diameter casing which are fixedly connected, and the floating body is an air bag group or a foam plastic casing floating cylinder group; when the floating body is the airbag group, an upper fixed disc and a lower fixed disc are fixed on the outer wall of the upper small-diameter sleeve, the airbag group is positioned between the upper fixed disc and the lower fixed disc, and the airbag group is respectively fixed with the upper fixed disc and the lower fixed disc through fixed ropes; when the floating body is the foam plastic sleeve floating cylinder group, the upper fixing disc is fixed on the outer wall of the upper small-diameter sleeve, and the foam plastic sleeve floating cylinder group is located below the upper fixing disc.

Preferably, still include inflation system, inflation system install in on the work platform on water, inflation system includes air compressor machine, gas tube and manometer, the one end of gas tube with the gas outlet of air compressor machine links to each other, the manometer install in on the gas tube, the other end of gas tube with the air inlet of gasbag group links to each other.

Preferably, prevent drunkenness and the device that blocks water includes sleeve pipe tray and kelp gauze and blocks water the parcel layer, the sleeve pipe tray is fixed in on the outer wall of deep water thimble integrated configuration, the kelp gauze block water the parcel layer wrap up in on the outer wall of deep water thimble integrated configuration and be located sleeve pipe tray downside.

Preferably, the sleeve pipe tray comprises a tray body, an edge vertical plate and reinforcing vertical ribs, the tray body is a circular disc, the edge vertical plate is vertically fixed at the edge position of the lower surface of the tray body and is annular, the reinforcing vertical ribs are vertically fixed on the lower surface of the tray body along the radial direction, and the reinforcing vertical ribs are uniformly distributed along the circumferential direction of the tray body.

Preferably, work platform on water includes horizontal I-steel and bucket row, the bucket row includes bucket row frame and round float, bucket row frame is formed by vertical channel-section steel, angle steel and stud welding, per two the bucket row frame with vertical setting in two a plurality of longitudinal arrangement between the bucket row frame the round float is through the fixed constitution of ligature mode a set of vertical bucket row, multiunit the bucket row sets up side by side, horizontal I-steel simultaneously with the multiunit the bucket is arranged the bucket row frame is fixed continuous, is constituteed work platform on water.

Preferably, the anchoring system comprises a winch, a connecting chain and a two-jaw anchor, the two-jaw anchor comprises a main anchor rod, two anchor flukes and a balance rod, a main anchor ring is arranged at the first end of the main anchor rod, one end of the connecting chain is connected with the main anchor ring, the other end of the connecting chain is wound on a winding drum of the winch, the winch is installed on the above-water working platform, the two anchor flukes are fixed at the second end of the main anchor rod and are symmetrical relative to the main anchor rod, the anchor flukes comprise a main anchor bent rod, a reinforcing rib plate and a willow-leaf-shaped anchor plate, the main anchor bent rod comprises a bent section, a first straight rod section and a second straight rod section which are sequentially connected, the end part of the bent section is connected with the second end of the main anchor rod, the first straight rod section is not collinear with the second straight rod section, and the second straight rod section is deviated to the main anchor rod, the said anchor plate is fixed to the said second straight rod section, the pointed end of the said anchor plate of the said willow leaf is bent towards the said main anchor straight rod, make the said fluke wholly be the three-section curved structure, the said gusset plate locates at the curved inboard of the said main anchor curved rod, and at the same time with the said curved section, the said first straight rod section is equipped with the lower anchor and anchor pulling ring, the said main anchor straight rod and the said main anchor curved rod are coplanar, the midpoint of the said balancing lever is fixed to the second end of the said main anchor straight rod, the said balancing lever is perpendicular to the said main anchor straight rod, the said main anchor curved rod locates in the level.

Preferably, the connecting chain includes a main anchor line and an anchor chain connected to each other, an end of the main anchor line being wound around a drum of the hoist, and an end of the anchor chain being connected to the main anchor ring.

Preferably, the drilling machine further comprises a mud pump, a mud tank, a high-pressure pipe, a mud return pipe, a water suction pipe, a drill rod, a drilling tool and a drill bit, wherein the drill bit is installed on the drilling tool, the drilling tool is connected to the drill rod, the drill rod receives the torque provided by the drilling machine and the upward force and the downward force along the axis direction of the drill rod, the mud pump and the mud tank are installed on the water work platform, a mud outlet of the mud pump is connected with the drill rod through the high-pressure pipe, a mud circulation connecting pipe is connected with the mud tank through the mud return pipe, a mud inlet of the mud pump is connected with the water suction pipe, and the water suction pipe extends into the mud tank.

Preferably, the propulsion system comprises a propeller support and a marine propeller, the propeller support being mounted on the marine work platform and the marine propeller being mounted on the propeller support.

Compared with the prior art, the invention has the following technical effects:

1. the overwater working platform is reasonable in design structure and balanced in stress, horizontal thrust generated by stormy waves can be effectively dispersed and reduced through structural gaps of the barrel rows, underwater operation is not needed during installation, autonomous navigation can be achieved, the conditions of reasonable structure, balanced stress, light self weight, safety, reliability and the like can be met, and the safety and normal operation of the platform can be guaranteed; the maximum drilling depth (including water depth) of the platform can reach 1000 m if the platform is designed to have the maximum drilling depth including water depth of 400 m at present, for example, the drainage of a barrel row is increased, the structural strength of a frame is increased;

2. the two-claw anchor has a simple design structure, is safe and reliable, and has reasonable mud-entering angles by increasing the geometric dimensions of the main anchor straight rod, the bent rod and the balance rod, reducing the width of the anchor plate, bending the main anchor bent rod twice and bending the anchor plate once, so that the anchor plate and the bent rod of the two-claw anchor can penetrate through a thick mud layer at the bottom of a lake to eat deep soft mud, thereby greatly improving the anchoring holding power of the two-claw anchor, effectively reducing the wind rear displacement of the platform and meeting the requirement of anchoring and positioning of a water coring drilling work platform system of a deep lake;

3. the deepwater casing system device is novel and reasonable in design, real-time butt joint and separation of a top loose joint casing and a deepwater casing combined structure are realized through the casing butt joint taper sleeve, so that slurry circulation normal drilling can be realized after butt joint, horizontal displacement of a platform system can be prevented from influencing the stability of the casing after separation, and the upper taper sleeve and the lower taper sleeve are visible through visual inspection during butt joint, so that the coaxiality of a drill rod and a casing system can be ensured, and the breakage accident caused by the fact that the drill rod rotates around the curve deformation is not easy to occur; the buoyancy of the floating body which is vertically upward is skillfully utilized to offset and balance the downward bending, inclination and lodging force of the casing system caused by self weight, so that the casing system is automatically righted in water, particularly in deep water, and the casing system is always kept in a vertical and stable state, thereby ensuring the smooth implementation of the core drilling work on the water in the deep lake.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic top view of the above-mentioned water platform and its upper structure distribution in this embodiment;

FIG. 2 is a schematic structural diagram of a water upper working platform in this embodiment;

FIG. 3 is a schematic diagram of the anchoring process of the system device for core drilling in deep lakes according to the embodiment;

FIG. 4 is a schematic structural view of the two-jaw anchor of this embodiment;

FIG. 5 is an enlarged view of the anchor plate of FIG. 4 taken in the direction A;

FIG. 6 is a view in the direction B of FIG. 4;

FIG. 7 is an enlarged view of a portion C of FIG. 4;

FIG. 8 is a schematic diagram showing the construction of the cannula system according to this embodiment;

FIG. 9 is a schematic view illustrating a docking manner of the sleeve docking taper sleeve according to the present embodiment;

FIG. 10 is a schematic view showing still another structure of the piping system according to the present embodiment;

FIG. 11 is a schematic diagram of the construction of the sleeve system when using a set of foam sleeve floats as the floats;

FIG. 12 is a schematic structural view of the anti-play and water-blocking device of the present embodiment;

FIG. 13 is a bottom view of the cannula tray of this embodiment;

description of reference numerals: 1-a water work platform; 101-longitudinal channel steel; 102-angle steel; 103-vertical ribs; 104-a circular buoy; 105-iron wire; 106-transverse I-beam; 107-steel wire rope; 2-a propulsion system; 201-propeller support; 202-marine propulsor; 3-an anchoring system; 301-a hoist; 302-main mooring line; 303-anchor chain; 304-two-jaw anchor; 3041-a primary anchoring rod; 3042-main anchor bent rod; a-a curved section; b-a first straight pole segment; c-a second straight pole segment; 3043-reinforcing plate; 3044-willow leaf-shaped anchor plate; 3045-a balance bar; 3046-a primary anchor ring; 3047-anchoring and pulling ring; 4-a drilling system; 5-a cannula system; 501-slurry circulation connection pipe; 502-top loose joint sleeve; 503-sleeve butt taper sleeve; 5031-fitting a taper sleeve; 5032-lower taper sleeve; 504-balloon group; 505-deep water casing combination structure; 5051-upper small diameter casing; d-fixing the upper fixing disc; e-lower fixed disk; 5052-lower large-diameter casing; 506-anti-moving and water-blocking device; 5061-cannula tray; 507-foam plastic casing buoys; f, a disk body; g, an edge vertical plate; h-reinforcing studs; 5062A water-blocking wrapping layer of herba Zosterae marinae gauze; 6-anchor conveying ship; 601-sending an anchor and lowering an anchor cantilever beam; 602-mooring line; 603-a buoy; 7-a mud tank; 8-a slurry pump; 9-high pressure pipe; 10-a slurry return pipe; 11-a suction pipe; 12-an air compressor; 13-a gas-filled tube; 14-pressure gauge.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-13, the present embodiment provides a system device for deep lake core drilling, which comprises an above-water work platform 1, a propulsion system 2, an anchoring system 3, a drilling system 4 and a casing system 5.

Wherein, propulsion system 2, anchor system 3 and drilling system 4 are installed on above-water work platform 1, and drilling system 4 includes the drilling rod, and the sleeve pipe system 5 cover is located the drilling rod outside. The casing system 5 is located between the lake bottom mud layer and the drilling machine and mainly functions to separate lake water, provide a passage for mud circulation during drilling work and simultaneously provide a working space for drill pipe lifting and drilling coring work. The drill pipe completes the drilling and coring work through the inner space of the casing system 5 and takes the cored core out of the borehole. The casing system 5 comprises a mud circulation connection pipe 501, a top loose joint casing 502, a casing connection taper sleeve 503, a floating body, a deep water casing combination structure 505 and an anti-moving and water-blocking device 506. The bottom end of the top loose joint sleeve 502 is detachably connected with the top end of the deep water sleeve assembly structure 505 through a sleeve butt joint taper sleeve 503, the sleeve butt joint taper sleeve 503 comprises an upper taper sleeve 5031 fixed at the bottom end of the top loose joint sleeve 502 and a lower taper sleeve 5032 fixed at the upper end of the deep water sleeve assembly structure 505, and the inner tapered surface of the upper taper sleeve 5031 can be attached to the outer tapered surface of the lower taper sleeve 5032. In this embodiment, the lower taper sleeve 5032 is located 1.5-5 meters below the bottom of the aquatic platform 1. By utilizing the sleeve butt joint taper sleeve 503, the top loose joint sleeve 502 and the deep water sleeve combination structure 505 are butted and separated in real time, so that slurry circulation normal drilling can be carried out after the butting, and the influence of the horizontal displacement of the overwater working platform 1 on the stability of the sleeve can be avoided after the separation. When the top loose joint sleeve 502, the upper taper sleeve 5031, the lower taper sleeve 5032 and the deep water sleeve assembly structure 505 are butted, the coaxiality of the drill rod and the sleeve system 5 can be ensured by visual observation, and the breakage accident caused by the winding deformation rotation of the drill rod is not easy to occur. The anti-moving and water-blocking device 506 is fixed at the bottom of the deepwater casing assembly structure 505 and is used for improving the stability of the casing, and simultaneously effectively preventing slurry in the casing from leaking to the lake bottom and preventing the casing from inclining or even falling down due to the fact that a mud layer around the bottom of the casing is eroded by the slurry caused by the slurry leakage, so that the normal operation of core drilling in the deepwater lake is ensured. The mud recirculation nipple 501 communicates with the top union 502 to facilitate the discharge of mud. The floating body is fixed on the outer side of the deep water sleeve combination structure 505, in the embodiment, the air bag groups 504 are located 5-30 meters away from the water surface, the number of the air bag groups 504 is determined according to the weight of the sleeve system 5 and the required buoyancy, the number can be 1-3, the number of the air bags in each group can be 1-3, the diameter of each air bag can be 0.3-0.6 meter, the length of each air bag can be 3-4.5 meters, and the pressure resistance of the air bags is more than 0.3 MPa. After the sleeve is inflated, the buoyancy force borne by the airbag group 504 is larger than the gravity force, a vertical upward thrust force is exerted on the sleeve system 5, and the sleeve is kept in a vertical state under the action of the self gravity, the self buoyancy force, the thrust force exerted on the sleeve by the airbag group 504 and the friction force of a mud layer, so that the effect of righting the sleeve is achieved. By skillfully utilizing the vertical upward buoyancy of the floating body to offset and balance the downward bending, inclination and lodging forces generated by the casing system 5 due to self weight, the casing system 5 is always kept in a vertical and stable state in water, particularly in deep water, thereby ensuring the smooth implementation of the core drilling work on the water in deep lakes.

When the system device for coring and drilling in the deep lake is used, firstly, the overwater working platform 1 is sailed to a drilling position through the propulsion system 2, the overwater working platform 1 is anchored through the anchoring system 3, the deep water casing combined structure 505 is lowered, the top loose joint casing 502 is butted with the deep water casing combined structure 505 through the casing butting taper sleeve 503, a drill rod is lowered to a mud layer at the bottom of the lake along the inside of the casing system 5, the mud circulation connecting pipe 501 is connected with a mud suction system on the overwater working platform 1, and the drilling system 4 is started after the adjustment is finished. By arranging the casing system 5, a slurry circulation channel from the bottom of a hole to a platform system is provided for core drilling work in deep lakes, and limiting protection is provided for a drill rod during rotation in the working process.

Further, in the present embodiment, the floating body is an air bag group 504, and those skilled in the art may select other types of floating bodies such as a foam plastic sleeve buoy, as long as the floating body can provide buoyancy. The deepwater casing combined structure 505 in this embodiment includes an upper small-diameter casing 5051 and a lower large-diameter casing 5052 which are fixedly connected, and the airbag group 504 is fixed outside the upper small-diameter casing 5051. Specifically, an upper fixed disk d and a lower fixed disk e are fixed on the outer wall of the upper small-diameter sleeve 5051, the air bag unit 504 is located between the upper fixed disk d and the lower fixed disk e, and the air bag unit 504 is fixed to the upper fixed disk d and the lower fixed disk e through fixing ropes. When the floating body is a foam plastic sleeve floating cylinder group, only the upper fixing disc is arranged on the outer wall of the upper small-diameter sleeve, and the foam plastic sleeve floating cylinder group is positioned below the upper fixing disc.

In order to facilitate the inflation, the present embodiment further comprises an inflation system, which is mounted on the water platform 1. The inflation system comprises an air compressor 12, an inflation tube 13 and a pressure gauge 14, wherein one end of the inflation tube 13 is connected with an air outlet of the air compressor 12, and the pressure gauge 14 is installed on the inflation tube 13. After the air bag group 504 is put into a water preset position, the air compressor 12 inflates the air bag group 504 through the inflation pipe 13, the pressure of the air bag group 504 is observed through the air pressure gauge, the inflation pressure is smaller than the air bag pressure-resistant value, and when the pressure of the air bag group 504 is insufficient, the air bag group 504 is replenished and inflated at any time. It should be noted that when using a foam sleeve float set as the float, no inflation system is required.

The type of anti-play and water blocking device 506 may be selected by one skilled in the art as desired. In this embodiment, the anti-moving and water-blocking device 506 includes a casing tray 5061 and a kelp gauze water-blocking wrapping layer 5062, the casing tray 5061 is fixed on the outer wall of the lower portion of the deepwater casing combined structure 505, and the kelp gauze water-blocking wrapping layer 5062 is wrapped on the outer wall of the deepwater casing combined structure 505 and is located on the lower side of the casing tray 5061. Typically, the kelp gauze water-blocking wrap 5062 is wrapped 2-4 meters in length, and the sleeve tray 5061 is located 3-18 meters from the bottom end of the deep water sleeve assembly 505.

The sleeve tray 5061 limits the kelp gauze water-blocking wrapping layer 5062 on the lower side on one hand, and increases the contact area with the lake bottom mud layer on the other hand, so that the deepwater sleeve assembly structure 505 is more stable. In this embodiment, sleeve pipe tray 5061 includes disk body f, marginal riser g and strengthens founding muscle h, and disk body f is the disc, and marginal riser g vertical fixation is in disk body f lower surface border position and be cyclic annular, strengthens the lower surface of founding muscle h along radial vertical fixation disk body f, and a plurality of enhancement founding muscle h are along the circumferencial direction equipartition of disk body f.

In order to improve the wind and wave resistance, in the embodiment, the water platform 1 comprises transverse I-shaped steel 106 and a bucket row. The barrel row comprises a barrel row frame and a round buoy 104, wherein the barrel row frame is formed by welding longitudinal channel steel 101, angle steel 102 and vertical ribs 103. Every two barrel row frames and a plurality of longitudinally arranged round buoys 104 vertically arranged between the two barrel row frames are bound by iron wires 105 or ropes to form a group of longitudinal barrel rows. The plurality of groups of bucket rows are arranged in parallel, and the transverse I-shaped steel 106 is fixedly connected with the bucket row frames of the plurality of groups of bucket rows at the same time to form the overwater working platform 1. The diagonal direction of the overwater working platform 1 is tensioned through a steel wire rope 107, two ends of the steel wire rope 107 are respectively connected with a lockset, and the lockset is fixed on the barrel row frame, so that the wind and wave resistance is further improved. Through designing bucket row frame-type work platform 1 on water, can increase the structural clearance, the horizontal thrust that effectively disperses and clear up the stormy waves and produce does not need underwater operation during the installation, can satisfy rational in infrastructure, and the atress is balanced, and the dead weight is lighter, conditions such as safe and reliable.

In order to improve the anchoring capability of the anchoring system 3, the anchoring system 3 of the present embodiment includes a winch 301, a connecting chain, and a two-jaw anchor 304, and the two-jaw anchor 304 includes a main anchoring rod 3041, two flukes, and a balance rod 3045. A first end of the main anchoring rod 3041 is provided with a main anchoring ring 3046, one end of the connecting chain is connected to the main anchoring ring 3046, and the other end of the connecting chain is wound around the winding drum of the winding machine 301. The winches 301 are fixed on the water platform 1, and the number and distribution mode of the winches can be selected according to actual needs. In this embodiment, four winches 301 are respectively fixed to four corners of the above-water work platform 1. The two flukes are fixed to the second end of the main anchor rod 3041 and are symmetrical with respect to the main anchor rod 3041, and each fluke comprises a main anchor bent rod 3042, a reinforcing rib plate and a willow-leaf-shaped anchor plate. The main bent anchor 3042 includes a curved section, a first straight section, and a second straight section that are connected in sequence, the end of the curved section is connected to the second end of the main straight anchor 3041, the first straight section is not collinear with the second straight section, and the second straight section is offset to the main straight anchor 3041. The willow-leaf-shaped anchor plate is fixed to the second straight rod section, and the tip of the willow-leaf-shaped anchor plate is bent toward the main anchor rod 3041, so that the fluke is integrally of a three-section bent structure. The reinforcing rib plate is located on the inner side of the bend of the main anchor bent rod 3042 and is fixedly connected with the bending section and the first straight rod section. The first straight rod section is provided with a lower anchor and an anchor lifting pull ring 3047. The main anchoring rod 3041 is coplanar with the main anchoring bent rod 3042, the middle point of the balance rod 3045 is fixed at the second end of the main anchoring rod 3041, and the balance rod 3045 is perpendicular to the plane of the main anchoring rod 3041 and the main anchoring bent rod 3042.

The two-jaw anchor 304 of this embodiment has a dimension that the total length of the balance rod 3045 is 3-6 m, the distance between the bent portion of the anchor plate and the tip end of the anchor plate is two thirds of the total length of the anchor plate before bending, the included angle between the two portions of the anchor plate is 10 ° ± 3 °, and the two portions of the anchor plate are welded to the main anchor bent rod 3042. The main anchor bent rod 3042 is formed by bending twice by heating, and the purpose of the main anchor bent rod 3042 is to improve the mud entering angle, so that a larger holding power can be obtained. The included angle between the first straight rod section and the main anchoring rod 3041 is 55 degrees +/-3 degrees, the included angle between the first straight rod section and the second straight rod section is 10 degrees +/-2 degrees, and the mud entrance angle of the tip end of the anchor plate is controlled to be 30-45 degrees.

In the embodiment, the geometrical dimensions of the main anchor straight rod 3041, the main anchor bent rod 3042 and the balance rod 3045 are increased, the width of the anchor plate is reduced, the main anchor bent rod 3042 is bent twice, and the anchor plate is bent once, so that the anchor plate and the main anchor bent rod 3042 have reasonable mud entering angles, the anchor plate can penetrate through a thick mud layer at the bottom of a lake to eat deep soft mud, the anchoring holding power of the two-claw anchor 304 is greatly improved, the defects that the conventional anchor is shallow in mud entering depth, cannot penetrate through the thick mud layer at the bottom of the lake, is insufficient in anchoring holding power, is prone to anchor walking and large-distance displacement in case of wind waves are overcome, and the requirement for anchoring and positioning of the offshore core drilling work platform system in deep lakes is met.

In this embodiment, the connecting link includes a main anchor rope 302 and an anchor chain 303 connected to each other, an end of the main anchor rope 302 is wound around a drum of the hoist 301, and an end of the anchor chain 303 is connected to the main anchor ring 3046. According to different actual requirements, a person skilled in the art can select other types of connecting chains as long as the winch 301 and the two-jaw anchor 304 can be connected. When the anchor is thrown, the anchor handling vessel 6 sends the two-fluke anchor 304 to the anchoring position while discharging the main anchor line 302. The anchor sending ship 6 is provided with an anchor sending lower anchor cantilever beam 601, and the anchor lifting rope 602 is wound on a circular tube at the end part of the anchor sending lower anchor cantilever beam 601. After reaching the anchoring position, the two-claw anchor 304 is placed in the lake bottom through the anchor lifting rope 602, and then the buoy 603 is fixed at the upper end of the anchor lifting rope 602, and the anchoring position is marked through the buoy 603.

In order to facilitate the sludge treatment, the embodiment also comprises a mud tank 7, a mud pump 8, a high-pressure pipe 9, a mud return pipe 10, a suction pipe 11, a drill rod, a drilling tool and a drill bit. The drill bit is installed on the drilling tool, the drilling tool is connected on the drilling rod, the drilling rod receives the torque provided by the drilling tool and the upward force and the downward force along the axis direction of the drilling rod, and the mud tank 7 and the mud pump 8 are installed on the water working platform 1. The mud outlet of the mud pump 8 is connected with the drill rod through a high-pressure pipe 9, the mud circulation connecting pipe 501 is connected with the mud tank 7 through a mud return pipe 10, the mud inlet of the mud pump 8 is connected with a water suction pipe 11, and the water suction pipe 11 extends into the mud tank 7. The mud is pumped to the position of a drill bit at the bottom of a drill hole along the drill rod, then upwards, upwards returns through an annular space between the drill rod and the wall of the drill hole and an annular space between the drill rod and the casing system 5, enters a mud circulation connecting pipe 501, then flows back to a mud tank 7 through a mud return pipe 10, and a mud pump 8 sucks the mud in the mud tank 7 through a water suction pipe 11, so that mud circulation is formed.

In order to enable autonomous navigation of the marine work platform 1, the propulsion system 2 of the present embodiment comprises a propeller support 201 and a marine propeller 202. The propeller support 201 is mounted on the above-water work platform 1, and the marine propeller 202 is mounted on the propeller support 201.

By adopting the system device for core drilling in deep lakes, drilling is carried out on the lake of the Mitsuki lake in Tibet, tests show that the displacement of the working platform system after the maximum wind is less than 2 meters under the natural conditions that the water depth is close to 94.5 meters, the maximum wind power is 6-7 grades, and sediments at the bottom of the lake exist in a sand layer and a sand gravel layer, the casing is continuously stable for more than 60 days, the drilling depth comprises that the water depth reaches 247.94 meters, and the drilling depth of the sediments at the bottom of the lake is 153.44 meters, so that the expected effect is achieved.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A system device for coring and drilling in deep lakes is characterized by comprising an overwater working platform, a propelling system, an anchoring system, a drilling system and a sleeve system, wherein the propelling system, the anchoring system and the drilling system are installed on the overwater working platform, the drilling system comprises a drilling machine and a drill rod, the sleeve system is sleeved outside the drill rod, the sleeve system comprises a slurry circulation connecting pipe, a top loose joint sleeve, a sleeve butt joint taper sleeve, a floating body, a deep water sleeve assembly structure and a scurring and water blocking prevention device, the bottom end of the top loose joint sleeve is detachably connected with the top end of the deep water sleeve assembly structure through the sleeve butt joint taper sleeve, the sleeve butt joint taper sleeve comprises an upper taper sleeve fixed at the bottom end of the top loose joint sleeve and a lower taper sleeve fixed at the upper end of the deep water sleeve assembly structure, the inner conical surface of the upper taper sleeve can be attached to the outer conical surface of the lower taper sleeve, the anti-shifting and water-blocking device is fixed to the bottom of the deep water casing pipe assembly structure, the slurry circulating connection pipe is communicated with the top loose joint casing pipe, and the floating body is fixed to the outer side of the deep water casing pipe assembly structure.

2. The system device for deepwater lake core drilling according to claim 1, wherein the deepwater casing combined structure comprises an upper small-diameter casing and a lower large-diameter casing which are fixedly connected, and the floating body is a gas bag group or a foam plastic casing floating cylinder group; when the floating body is the airbag group, an upper fixed disc and a lower fixed disc are fixed on the outer wall of the upper small-diameter sleeve, the airbag group is positioned between the upper fixed disc and the lower fixed disc, and the airbag group is respectively fixed with the upper fixed disc and the lower fixed disc through fixed ropes; when the floating body is the foam plastic sleeve floating cylinder group, the upper fixing disc is fixed on the outer wall of the upper small-diameter sleeve, and the foam plastic sleeve floating cylinder group is located below the upper fixing disc.

3. The system device for deep lake core drilling according to claim 2, further comprising an inflation system, wherein the inflation system is installed on the above-water work platform, the inflation system comprises an air compressor, an inflation tube and a pressure gauge, one end of the inflation tube is connected with an air outlet of the air compressor, the pressure gauge is installed on the inflation tube, and the other end of the inflation tube is connected with an air inlet of the air bag set.

4. The system-installation for deep-water lake core drilling according to claim 1, wherein the anti-moving and water-blocking device comprises a casing tray and a kelp gauze water-blocking wrapping layer, the casing tray is fixed on the outer wall of the deep-water casing assembly structure, and the kelp gauze water-blocking wrapping layer is wrapped on the outer wall of the deep-water casing assembly structure and is located on the lower side of the casing tray.

5. The system device for deep water lake core drilling according to claim 4, wherein the casing tray comprises a disc body, an edge vertical plate and reinforcing studs, the disc body is a circular disc, the edge vertical plate is vertically fixed at the edge position of the lower surface of the disc body and is annular, the reinforcing studs are vertically fixed at the lower surface of the disc body along the radial direction, and a plurality of the reinforcing studs are uniformly distributed along the circumferential direction of the disc body.

6. The system device for deep lake core drilling according to claim 1, wherein the above-water work platform comprises transverse i-shaped steel and barrel rows, the barrel rows comprise barrel row frames and round buoys, the barrel row frames are formed by welding longitudinal steel, angle steel and studs, every two barrel row frames and a plurality of longitudinally arranged round buoys vertically arranged between the two barrel row frames are fixed by binding to form a group of longitudinal barrel rows, a plurality of groups of barrel rows are arranged in parallel, and the transverse i-shaped steel is simultaneously and fixedly connected with the barrel row frames of the plurality of groups of barrel rows to form the above-water work platform.

7. The system set for deepwater lake coring drilling according to claim 1, wherein the anchoring system comprises a winch, a connecting chain and a two-jaw anchor, the two-jaw anchor comprises a main anchoring rod, two flukes and a balance rod, a first end of the main anchoring rod is provided with a main anchor ring, one end of the connecting chain is connected with the main anchor ring, the other end of the connecting chain is wound on a reel of the winch, the winch is mounted on the above-water work platform, the two flukes are fixed at a second end of the main anchoring rod and are symmetrical about the main anchoring rod, the flukes comprise a main anchor bent rod, a reinforcing rib plate and a leaf-shaped anchor plate, the main anchor bent rod comprises a bent section, a first straight rod section and a second straight rod section which are sequentially connected, the end of the bent section is connected with the second end of the main anchoring rod, the first straight rod section is not collinear with the second straight rod section, the second straight rod section deviates from the main anchor rod, the willow-leaf-shaped anchor plate is fixed to the second straight rod section, the pointed end of the willow-leaf-shaped anchor plate is bent towards the main anchor rod, so that the fluke is integrally of a three-section bent structure, the reinforcing rib plate is located on the bent inner side of the main anchor bent rod and is fixedly connected with the bent section and the first straight rod section, the first straight rod section is provided with a lower anchor and an anchor pulling ring, the main anchor rod is coplanar with the main anchor bent rod, the middle point of the balance rod is fixed to the second end of the main anchor rod, and the balance rod is perpendicular to the plane where the main anchor rod and the main anchor bent rod are located.

8. The system-apparatus for deep lake core drilling according to claim 7, wherein the connecting chain comprises a main anchor line and an anchor chain connected with each other, an end of the main anchor line is wound on a reel of the winch, and an end of the anchor chain is connected with the main anchor ring.

9. The system device for deepwater lake core drilling according to claim 1, further comprising a mud pump, a mud tank, a high-pressure pipe, a mud return pipe, a suction pipe, a drill tool and a drill bit, wherein the drill bit is mounted on the drill tool, the drill tool is connected to the drill pipe, the drill pipe receives the torque provided by the drill tool and the upward and downward forces in the axial direction of the drill pipe, the mud pump and the mud tank are mounted on the offshore platform, a mud outlet of the mud pump is connected to the drill pipe through the high-pressure pipe, a mud circulation connection pipe is connected to the mud tank through the mud return pipe, a mud inlet of the mud pump is connected to the suction pipe, and the suction pipe extends into the mud tank.

10. The system set up for deep lake core drilling of claim 1, wherein the propulsion system comprises a propeller support and a marine propeller, the propeller support being mounted on the marine platform and the marine propeller being mounted on the propeller support.