A kind of initiatively pressurize coring tool
The utility model relates to a kind of coring tool, particularly about a kind of active pressurize coring tool being applicable to gas hydrates.
It is the basic data that its development of resources and Engineering Geology Evaluation research institute need that core is got in the pressurize of natural gas hydrate deposits thing core, conventional coring tool does not have pressurize measure, or the dwell time of closed coring tool is limited, when core is recovered to well head from down-hole, due to temperature, the change of the ambient conditionss such as pressure, the changes such as the core sample of natural gas hydrate deposits thing undergoes phase transition will be caused, the character of hydrate sediment core in actual formation cannot be reacted, even cannot obtain complete rock core, used natural gas hydrate deposits thing coring tool carries out passive pressurize by ball valve merely, pressurize success rate is lower.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide a kind ofly initiatively can realize pressure compensation, the dwell time is long, pressurize is satisfactory for result and can react active pressurize coring tool and the using method thereof of core character in actual formation.
For achieving the above object, the utility model takes following technical scheme: a kind of initiatively pressurize coring tool, it is characterized in that, it comprises: the hollow urceolus of a shape of falling T, the inwall of described urceolus is the step structure that young tripe is large, one to be plugged in described urceolus and top and its interference fit, the hollow inner cylinder of bottom and its matched in clearance, one spool being arranged on described inner core bottom, one groove being circumferentially opened in described inner core bottom outer wall, one wedge described groove and under described inner tank theca and described outer tube inner wall between switching spool, somely radially insert described urceolus and the first pin for locking described switching spool and inner core, one is opened in described inner core top and vertical sectional shape is the first through annular space of inverted L-shaped, one to be plugged in described inner core and the sliding sleeve covered on described annular space, some radial directions insert described urceolus and the second pin for locking described inner core and sliding sleeve, one is fastenedly connected the voussoir in the inner core above described sliding sleeve, one is coaxially fastenedly connected the hollow cylinder in described inner core upper surface by a connection piece, the barrel of described cylindrical shell offering vertical sectional shape is the second inverted U-shaped annular space, described second annular space and described connector form an annular housing, described connector is offered the 3rd annular space of the described annular housing of a connection and the first annular space, the upper surface of described connector arranges the described annular housing of some connections and extraneous one way valve, also comprise one and be plugged in piston rod in described inner core, one is fastenedly connected the spearhead on described piston rod top.
Described spool is ball valve core.
Described connector is two flanges.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, cylindrical shell of the present utility model is communicated with extraneous by one way valve disposed thereon, inner core is communicated with by the annular space being opened in the inverted L-shaped on inner core barrel, before using the utility model, utilize the sliding sleeve covered on annular space to be disconnected with inner core by cylindrical shell to be communicated with, and in airtight cylindrical shell, pass into inert gas by one way valve, until the pressure in cylindrical shell is equal with the strata pressure value that actual measurement obtains, get after core completes, by on carry piston rod and drive on sliding sleeve and move, thus cylindrical shell is communicated with inner core, quick voltage stabilizing and sealing in core process can got, keep the down-hole state of core to greatest extent, pressurize is effective.2, due to the utility model transfer in drill string get core well section after, by the pump pressure of the urceolus of inverted T-shaped, the drilling fluid of drill string and applying, itself and drill string are fastenedly connected.After coring completes, by jigger lifting piston connecting rod, thus drive on inner core, cylindrical shell and urceolus and move, to take out the utility model, therefore simple to operate and convenient and swift.3, transfer and get sandwich layer position owing to can directly utilize rope the utility model to be crossed drill string to down-hole, and do not need again to pull out of hole, install after transfer again, therefore simple to operate, quick.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that the utility model sends into when sandwich layer position is got in down-hole
Fig. 2 is overall structure schematic diagram when starting initiatively pressurize after core enters inner core
Fig. 3 is that the utility model completes pressurize and gets overall structure schematic diagram when core reclaims out well
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, the utility model comprises the hollow cylindrical urceolus 1 of the shape of falling T, and urceolus 1 inwall is the step structure that young tripe is large.The hollow cylindrical inner core 2 of a top and its interference fit, bottom and its matched in clearance is plugged in urceolus 1, the bottom of inner core 2 arranges a ball valve core 5, a groove 6 is offered along the inner core 2 outer wall circumference below urceolus 1 internal step tread, wedge a ball valve switch 7 between the outer wall of the inner core 2 of groove 6 and groove less than 6 and the inwall of urceolus 1, insert one for the pin 8 of lock ball threshold switch 7 and inner core 2 along the radial direction bottom urceolus 1.
The annular space 9 that a vertical sectional shape is inverted L-shaped is offered in inner core 2 upper inside wall to its upper surface, the sliding sleeve 10 of a covering annular space 9 that the inwall of inner core 2 is fitted.The radial direction on urceolus 1 top plugs the pin 11 of a locking inner core 2 and sliding sleeve 10, and the inwall of the inner core 2 above sliding sleeve 10 is fastenedly connected a voussoir 12.The upper surface of inner core 2 is coaxially fastenedly connected a hollow by a upper flange 13 and a lower flange 14 and wall offers the cylindrical shell 15 that vertical sectional shape is inverted U-shaped annular space, the annular space of cylindrical shell 15 and the upper surface of upper flange 8 form an annular housing 16, the annular space 17,18 being communicated with cavity 16 and annular space 9 is all offered in upper flange 13 and the inner side of lower flange 14, and the upper surface of cylindrical shell 15 evenly arranges some one way valves 19 being communicated with the external world and cavity 16.Plug a piston rod 3 in inner core 2, the top of piston rod 3 is fastenedly connected a spearhead 4.
The following detailed description of using method of the present utility model, comprise the following steps:
1) as shown in Figure 1, transfer to before drill string 20 at the utility model, starting ball valve switch 7 makes ball valve core 5 be in opening, sliding sleeve 10 closes annular space 9, make cavity 16 be in sealing state, be drilled into setting get core position after stop bore, according to the strata pressure that actual measurement obtains, in cavity 16, inert gas is passed into, until the pressure in cavity 16 is equal with strata pressure by one way valve 19.The utility model is transferred the bottom to drill string 20, by the pump pressure of the drilling fluid in drill string 20 and applying, the utility model is remained static in the course of the work.
2) as shown in Figure 2, by being fastenedly connected the hoisting tool (not shown) upwards jigger lifting piston connecting rod 3 on spearhead 4, start to carry out core work.
3) as shown in Figure 3, continue jigger lifting piston connecting rod 3, apply pulling force by sliding sleeve 10 pairs of voussoirs 12, so drive be wedged on inner core 2 ball valve switch 7 on move, shear pin 8, and close ball valve core 5, continuation jigger lifting piston connecting rod 3 drives on sliding sleeve 10 and moves to location voussoir 12, continuation is carried and shear pin 11, opens annular space 9, cavity 16 is communicated with, to rock core just pressurize with inner core 2.Continue jigger lifting piston connecting rod 4, make the upper surface of ball valve switch 7 be close to the cascaded surface of urceolus 1, thus pulling force is applied to urceolus 1, to take out the utility model.
The various embodiments described above are only for illustration of the utility model; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solutions of the utility model and improvement, all should not get rid of outside protection domain of the present utility model.