阅读说明：本技术 一种天然气水合物岩芯保压切割装置 (Natural gas hydrate core pressurize cutting device ) 是由 王晋 薛启龙 黄蕾蕾 曲俊 王冲 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种天然气水合物岩芯保压切割装置,属于非常规能源技术领域,包括岩心管、外管组件、往复切割组件和驱动组件；驱动组件与往复切割组件相连并为往复切割组件提供动力；往复切割组件包括横向导轨座、锯条、锯条安装座、纵向导轨座、第一丝杠和第二丝杠；第一丝杠的端部和第二丝杠的端部与驱动组件相连；纵向导轨座与第一丝杠上的丝杠螺母相连接,使得纵向导轨座能够纵向移动,横向导轨座与第二丝杠上的丝杠螺母相连接,使得纵向导轨座能够横向移动；锯条安装座的两侧分别设置有横向和纵向的十字凹槽,分别与纵向导轨座和横向导轨座相连。本发明能够解决水合物岩芯样品在保压密封环境下的快速、稳定切割问题。(The invention discloses a natural gas hydrate core pressure maintaining cutting device, which belongs to the technical field of unconventional energy and comprises a core tube, an outer tube assembly, a reciprocating cutting assembly and a driving assembly; the driving assembly is connected with the reciprocating cutting assembly and provides power for the reciprocating cutting assembly; the reciprocating cutting assembly comprises a transverse guide rail seat, a saw blade mounting seat, a longitudinal guide rail seat, a first lead screw and a second lead screw; the end part of the first lead screw and the end part of the second lead screw are connected with the driving assembly; the longitudinal guide rail seat is connected with a screw nut on the first screw rod, so that the longitudinal guide rail seat can move longitudinally, and the transverse guide rail seat is connected with a screw nut on the second screw rod, so that the longitudinal guide rail seat can move transversely; the two sides of the saw blade mounting seat are respectively provided with a transverse cross groove and a longitudinal cross groove which are respectively connected with the longitudinal guide rail seat and the transverse guide rail seat. The invention can solve the problem of rapid and stable cutting of the hydrate core sample in a pressure-holding sealed environment.)

1. A natural gas hydrate core pressure maintaining cutting device comprises a core barrel, an outer pipe assembly, a reciprocating cutting assembly and a driving assembly, and is characterized in that the outer pipe assembly is sleeved on the outer side of the core barrel, and the driving assembly is connected with the reciprocating cutting assembly and provides power for the reciprocating cutting assembly;

the reciprocating cutting assembly comprises a transverse guide rail seat, a saw blade mounting seat, a longitudinal guide rail seat, a first lead screw and a second lead screw; the end part of the first lead screw and the end part of the second lead screw are connected with the driving assembly; the longitudinal guide rail seat is connected with a screw nut on the first screw rod, so that the longitudinal guide rail seat can move longitudinally, and the transverse guide rail seat is connected with a screw nut on the second screw rod, so that the longitudinal guide rail seat can move transversely; the saw blade is fixed on the saw blade mounting seat; and the two sides of the saw blade mounting seat are respectively provided with a transverse cross groove and a longitudinal cross groove which are respectively connected with the longitudinal guide rail seat and the transverse guide rail seat.

2. A gas hydrate core pressure maintaining cutting apparatus as claimed in claim 1, wherein the sealing assemblies are provided at both ends of the outer tube assembly, the sealing assemblies are disc-shaped structures, and are provided with an opening at a central position for the core tube to pass through.

3. The gas hydrate core pressure maintaining cutting device of claim 2, wherein the sealing component is composed of a sealing gasket and an end flooding plug seal, and the sealing gasket is located at the edge of the end flooding plug seal.

4. The natural gas hydrate core pressure maintaining cutting device as claimed in claim 1, wherein the sealing gasket is made of stainless steel material; the end face flooding plug seal adopts a combination structure of fluororubber and a metal frame.

5. The gas hydrate core dwell cutting apparatus of claim 1, wherein the drive assembly is connected to the reciprocating cutting mechanism by an adapter assembly.

6. The gas hydrate core dwell cutting apparatus as claimed in claim 5, wherein the drive assembly includes a drive motor, a motor mount and a coupling; the motor support fixes the driving motor on the outer tube assembly, and the coupler is arranged between an output shaft of the driving motor and the adapter assembly.

7. The gas hydrate core dwell cutting apparatus of claim 6, wherein the adapter assembly includes a motor shaft and a flat key; the flat key is arranged on the motor rotating shaft and is used for being connected with a coupler of the driving assembly.

8. The gas hydrate core pressure maintaining cutting device of claim 1, wherein the number of the driving assemblies is two, and the driving assemblies are connected with the first lead screw and the second lead screw.

9. A gas hydrate core pressure maintaining cutting apparatus as claimed in claim 1, wherein the reciprocating cutting assembly further comprises a transverse and a longitudinal guide rail, which are slidably connected with the longitudinal guide rail seat and the transverse guide rail seat respectively.

10. The gas hydrate core pressure maintaining cutting device of claim 1, wherein the movable assembly is further configured with a speed reducer for realizing low-speed and high-torque output.

Technical Field

The invention belongs to the technical field of unconventional energy sources, and particularly relates to a natural gas hydrate core pressure maintaining cutting device.

Background

At present, in the process of oil and gas field exploration and geological exploration, a certain number of cores need to be drilled, observed, analyzed and researched, so that the following data can be obtained:

1) age, lithology, depositional properties of the formation;

2) physical and chemical properties of the reservoir and oil, gas and water conditions;

3) subsurface structural conditions (e.g., faults, joints and tendencies, dip, etc.);

4) the movement and distribution of oil, gas and water during the production process, the change of the stratum structure and the like.

The core is mainly sampled by a core ring bit or other coring tool, and the sampling length is generally as large as possible in a single sampling because of the difficulty of sampling, but the sampling causes difficulty in the analysis and storage of the core sample on the ground, so that the sample must be cut according to the requirements and results of the analysis so as to be stored, transported and further analyzed.

The natural gas hydrate has the characteristics of high energy density, wide distribution, large reserve, shallow burial, good formed physical condition, cleanness and environmental protection, and the exploration and exploitation work of the natural gas hydrate is gradually paid attention to. At present, the pressure-maintaining sampling technology of the natural gas hydrate at home and abroad is mature, the in-situ pressure of the hydrate can be maintained, and the hydrate is extracted from the seabed to the sea surface to provide a minimum disturbance sample of the natural gas hydrate. However, there are few studies on how to divide a sample while maintaining the original pressure after the sample is taken.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to meet the requirements of high-quality and high-precision detection technology and equipment for hydrates in the exploration and development processes of natural gas hydrates in China, and aims to provide a reciprocating cutting device for hydrate cores, which can solve the problem of rapid and stable cutting of hydrate core samples in a pressure-holding sealed environment, enrich chains of equipment for hydrate drilling, pressure-holding coring and detection technology, improve the surveying capacity of natural gas hydrates and improve the localization level of related technical equipment.

In order to achieve the aim, the reciprocating cutting device for the hydrate core comprises a core barrel, an outer pipe assembly, a reciprocating cutting assembly and a driving assembly, wherein the outer pipe assembly is sleeved on the outer side of the core barrel, and the driving assembly is connected with the reciprocating cutting assembly and provides power for the reciprocating cutting assembly;

the reciprocating cutting assembly comprises a transverse guide rail seat, a saw blade mounting seat, a longitudinal guide rail seat, a first lead screw and a second lead screw; the end part of the first lead screw and the end part of the second lead screw are connected with the driving assembly; the longitudinal guide rail seat is connected with a screw nut on the first screw rod, so that the longitudinal guide rail seat can move longitudinally, and the transverse guide rail seat is connected with a screw nut on the second screw rod, so that the longitudinal guide rail seat can move transversely; the saw blade is fixed on the saw blade mounting seat; and the two sides of the saw blade mounting seat are respectively provided with a transverse cross groove and a longitudinal cross groove which are respectively connected with the longitudinal guide rail seat and the transverse guide rail seat.

Further, the sealing assemblies are disposed at both ends of the outer tube assembly, the sealing assemblies are disc-shaped structures, and are provided at a central position with an opening for the core tube to pass through.

Furthermore, the sealing assembly consists of a sealing gasket and an end face flooding plug seal, and the sealing gasket is positioned on the edge of the end face flooding plug seal.

Further, the sealing gasket is made of stainless steel materials; the end face flooding plug seal adopts a combination structure of fluororubber and a metal frame.

Further, the drive assembly is connected with the reciprocating cutting mechanism through an adapter assembly.

Further, the driving assembly comprises a driving motor, a motor bracket and a coupling; the motor support fixes the driving motor on the outer tube assembly, and the coupler is arranged between an output shaft of the driving motor and the adapter assembly.

Further, the switching assembly comprises a motor rotating shaft and a flat key; the flat key is arranged on the motor rotating shaft and is used for being connected with a coupler of the driving assembly.

Furthermore, the number of the driving assemblies is two, and the driving assemblies are connected with the first lead screw and the second lead screw.

Further, the reciprocating cutting assembly further comprises transverse and longitudinal guide rails which are respectively connected with the longitudinal guide rail seat and the transverse guide rail seat in a sliding mode.

Further, the movable assembly is also provided with a speed reducer for realizing the output of low-speed large torque.

The reciprocating cutting device for the hydrate rock core provided by the invention has the following beneficial effects: the device has the characteristics of simple and reasonable design, low manufacturing and maintenance cost, good pressure maintaining and sealing performance of the device, wide cutting lithology hardness range, high cutting efficiency, flat and smooth cut and the like, can effectively improve the efficiency of the natural gas hydrate core pressure maintaining monitoring and transferring device, is beneficial to improving the survey level of the natural gas hydrate in China, and has good social and economic benefits.

Drawings

Fig. 1a is a schematic structural diagram of a natural gas hydrate core pressure maintaining cutting device in this embodiment.

FIG. 1b is a schematic side view of the structure of FIG. 1 a.

Fig. 2a is a schematic structural diagram of the pressure maintaining seal of the natural gas hydrate core pressure maintaining cutting device in the embodiment.

Fig. 2b is a cross-sectional view of the pressure retaining seal of fig. 2 a.

Fig. 3 is a schematic structural diagram of a reciprocating cutting assembly of the natural gas hydrate core pressure maintaining cutting device in the embodiment.

Fig. 4 is a schematic structural diagram of a saw blade mounting seat of the natural gas hydrate core pressure maintaining cutting device in the embodiment.

Fig. 5a is a schematic structural diagram of a driving assembly of the natural gas hydrate core pressure maintaining cutting device in the embodiment.

Fig. 5b is a side view of the drive assembly of fig. 5 a.

Fig. 6a is a schematic structural diagram of an adapter assembly of the natural gas hydrate core pressure maintaining cutting device in the present embodiment.

Fig. 6b is a side cross-sectional view of the adapter assembly of fig. 6 a.

In the drawings:

1. a core barrel; 2. a seal assembly; 3. an outer tube assembly; 4. a reciprocating cutting assembly; 5. a drive assembly; 6. a switching component; 201. a gasket; 202. plugging and sealing the end face; 401. a transverse guide rail seat; 402. a guide rail; 403. an end face seal seat; 404. a saw blade; 405. a saw blade mounting seat; 406. a longitudinal rail seat; 407. a lead screw nut; 408. a rolling bearing; 409. a lead screw; 501. a drive motor; 502. a motor bracket; 503. a coupling; 601. a transfer support; 602. a motor shaft; 603. a flat bond; 604. plugging and sealing the end face; 605. a combination bearing; 606. and (4) axially plugging and sealing.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments in order to make the technical field better understand the scheme of the present invention.

As shown in fig. 1a-1b, the reciprocating cutting mechanism is a part of a hydrate pressure-maintaining transfer detection mechanism, one end of the reciprocating cutting mechanism is connected with a pressure-maintaining core-taking mechanism or a detection mechanism through a ball valve, and the other end of the reciprocating cutting mechanism is connected with the pressure-maintaining transfer mechanism through a ball valve.

The apparatus includes a core barrel 1, a seal assembly 2, an outer tube assembly 3, a reciprocating cutting assembly 4, a drive assembly 5, and an adapter assembly 6.

The core tube 1 and the outer tube component 3 are of tubular structures, the outer tube component 3 is sleeved on the outer side of the core tube 1, and the core tube 1 can extend out of the outer tube component 3. The reciprocating cutting assembly 4 is positioned in the outer tube assembly 3; a drive assembly 5 is located outside the outer tube assembly 3 and provides a driving force to the reciprocating cutting mechanism 4 through an adapter assembly 6 disposed at an opening above the outer tube assembly 3. The core barrel 1 is of a two-section structure, in which a core is inserted for cutting by the reciprocating cutting assembly 4.

As shown in fig. 2a-2b, the sealing assemblies 2 are disposed at two ends of the outer pipe assembly 3, and perform a pressure maintaining sealing function, which is an important requirement of the hydrate core cutting device. The sealing assembly 2 is of disc-shaped construction and is provided with an opening at a central location for the core barrel 1 to pass through. The sealing assembly 2 is composed of a sealing gasket 201 and an end face flooding plug seal 202, wherein the end face flooding plug seal 202 is in a disc-shaped structure, and the sealing gasket 201 is in an annular structure and is respectively positioned on the edges of the front side and the back side of the end face flooding plug seal 202. Wherein, the sealing gasket 201 is made of stainless steel material, and the end surface of the sealing gasket is precisely processed to ensure high smoothness; the end flooding plug 202 adopts a combination structure of fluororubber and metal frame. The sealing assembly 2 is positioned between the outer pipe assembly 3 and the connected part (the high-pressure ball valve), and can ensure sealing under high pressure through locking of the flange.

The outer pipe assembly 3 provides installation space and support for the reciprocating cutting mechanism 4, the driving mechanism 5 and the adapter assembly 6, and the end face of the outer pipe assembly is in a square flange form and is used for being connected with ball valves or detection parts on two sides. The outer pipe component 3 is made of stainless steel and can bear high pressure.

As shown in fig. 3, the reciprocating cutting assembly 4 is composed of a transverse guide rail seat 401, an end face seal seat 403, a saw blade 404, a saw blade mounting seat 405, a longitudinal guide rail seat 406, a lead screw nut 407, a rolling bearing 408, a first lead screw 409 and a second lead screw 410.

Wherein, the one end of first lead screw 409 is connected with adapter assembly 6 through the square key to realize rotating under drive assembly 5's effect, and, still overlap on the tip of first lead screw 409 and be equipped with antifriction bearing 408, play the effect of support for the rotation of first lead screw 409. The first lead screw 409 is sleeved with a lead screw nut 407, and the lead screw nut 407 is fixedly connected with the longitudinal guide rail seat 406, so that the lead screw nut 407 is driven to move along the axial direction of the lead screw 409 through the rotation of the first lead screw 409, and then the longitudinal guide rail seat 406 is driven to move in the longitudinal direction.

Similarly, the second lead screw 410 is connected with the driving assembly 5 through the adapter assembly 6 and is connected with the transverse rail seat 401 through a lead screw nut, so that the transverse rail seat 401 is driven to move in the transverse direction by the rotation of the second lead screw 410.

Aiming at the screw rod structure, other structures with similar properties can be expanded and used, such as any mechanical structure which can realize the translation from the rotation of the motor to the saw blade, such as a crank block mechanism, a gear rack mechanism and the like.

As shown in fig. 4, a saw blade 404 is fixed on a saw blade mounting base 405, and both sides of the saw blade mounting base 405 are respectively provided with a transverse and a longitudinal cross-shaped groove for connecting with a longitudinal rail base 406 and a transverse rail base 401. Specifically, saw blade mounting seat 405 is connected with longitudinal rail seat 406 through a transverse cross groove, so that longitudinal rail seat 406 can drive saw blade mounting seat 405 to move longitudinally; saw blade mount 405 is connected to cross rail mount 401 via a longitudinal cross groove, such that cross rail mount 401 can move saw blade mount 405 laterally.

Through the arrangement, the rotation of the motor can be converted into the vertical or horizontal translation motion of the guide rail seat, and the cross slide block structure is adopted, so that the saw blade mounting seat 405 is driven to move through the coupling action of the transverse guide rail seat 401 and the longitudinal guide rail seat 406, and the vertical feeding/withdrawing and the left-right reciprocating cutting of the saw blade 404 are realized.

In addition, the reciprocating cutting assembly 4 further comprises a guide rail 402 disposed in a transverse direction and a longitudinal direction, which is slidably connected with the longitudinal rail base 406 and the transverse rail base 401, respectively, for ensuring smooth movement of the longitudinal rail base 406 and the transverse rail base 401.

Therefore, the reciprocating cutting component 4 makes full use of the lead screw and the crosshead shoe type guide rail, on one hand, the rotation motion of the motor is converted into the translation motion of the nut by the matching of the lead screw and the lead screw nut, on the other hand, the transverse and longitudinal translation motions are coupled by the crosshead shoe type guide rail to form the reciprocating cutting action, and the longitudinal and transverse independent motors can ensure that the cutting and feeding amount is adjustable, so that the applicability of the device is improved.

As shown in fig. 5a-5b, the driving assembly 5 is composed of a driving motor 501, a motor bracket 502 and a coupling 503. The primary function of the drive assembly 5 is to provide a driving force to the reciprocating cutting mechanism 4 through the adapter assembly 6. The motor bracket 502 is used for fixing the driving motor 501 on the outer tube assembly 3, and the coupling 503 is arranged between the output shaft of the driving motor 501 and the adapter assembly 6, and the effect of machining errors on transmission is reduced. The number of the driving assemblies 5 is two, the driving assemblies are respectively connected with the first lead screw and the second lead screw, and the reciprocating cutting mechanism is driven to realize transverse reciprocating and longitudinal feeding motions.

In addition, the driving motor 501 is also provided with a speed reducer, so that the output of low-speed and large torque is facilitated, and the applicability of the device to rock cores with different hardness can be improved.

As shown in fig. 6a-6b, the adaptor assembly 6 is composed of an adaptor support 601, a motor shaft 602, a flat key 603, an end face flooding plug seal 604, a combined bearing 605 and an axial flooding plug seal 606, the main function of the adaptor assembly 6 is to transmit the power of the driving motor to the screw rod of the reciprocating cutting mechanism, and the adaptor mechanism is provided to prevent the output end of the motor from bearing large internal pressure.

The adapter 601 is fixedly connected to the opening above the outer tube assembly 3 by bolts, and a flat key 603 is provided on the motor shaft 602. The flat key 603 is used to connect with the coupling 503 of the driving assembly 5, so as to transmit the rotation of the driving motor 5 to the motor shaft 602. The motor shaft 602 is sleeved with a combined bearing 605, which is used for transferring the end face fluid pressure. The end surface flooding plug seal 604 and the axial flooding plug seal 606 are respectively arranged at the connecting position of the adapter assembly 6 and the outer pipe assembly 3 and the connecting position of the adapter assembly 6 and the lead screw, and internal high-pressure fluid leakage is avoided.

The rotating speeds of the transverse swing driving motor and the longitudinal feeding motor related in the invention are independently adjusted, but as the transverse swing and the longitudinal feeding have reasonable matching values in the cutting process of the cores with the same hardness, the independent adjustment and the linkage work are allowed in a matched control system.

The natural gas hydrate core pressure maintaining and cutting device can be used for cutting the middle core of a natural gas hydrate core pressure maintaining and transferring system, in the system, in order to ensure the in-situ characteristic of the natural gas hydrate core, the cutting needs to be carried out under the pressure maintaining condition after the core is obtained, so the cutting environment needs to be ensured to be closed; meanwhile, in the cutting process, the subsequent transfer and storage are carried out, so that the smooth and flat cut needs to be ensured, the requirement on longitudinal cutting force can be reduced by the reciprocating cutting mode, and the deformation and damage of the rock core are reduced.

The natural gas hydrate core pressure-maintaining cutting device can be used in other occasions with pressure-maintaining or sealing cutting requirements, and sealing media of the natural gas hydrate core pressure-maintaining cutting device include fluids such as pure water, seawater and drilling fluid, and inert gases such as air, carbon dioxide and nitrogen.

The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.