CN2274688Y - Core catcher for rope coring tool - Google Patents

Abstract

The utility model relates to a core catcher for a rope coring tool. The utility model comprises a diameter reducing sleeve, which is connected with the lower end of an inner coring cylinder, an integral clamping core gripper, and a core bit, which is connected with the lower end of an outer coring cylinder. The utility model is characterized in that the lower end of the diameter reducing sleeve is provided with an extension, the outer diameter of which is the same as that of the diameter reducing sleeve, and the inner diameter of the extension is enlarged; at least 10 clamping reeds which are curved into the shape of a shed are fixed on the periphery of the inner diameter of the lower end of the diameter reducing sleeve. The inner cavity of the core bit of the lower end of the outer coring cylinder is provided with a top sleeve, which is limited in the inner cavity of the core bit by a limiting device, can push aside the clamping reeds making the clamping reeds open, and is concealed in the inner wall of the extension. A stretching device is arranged below the middle section of the outer cylinder of a suspension device. The utility model is suitable for the coring of various stratum layer drilling. The utility model has the advantages of simple structure and reliable operation.

Description

A kind of card center device on the wire line coring instrument

The utility model relates to a kind of core drilling instrument, the card center device on the wire line coring instrument that the various stratigraphical drillings of particularly a kind of energy adaptation are cored.

Card center device on the present wire line coring instrument, it includes a undergauge cover that is connected instrument inner core lower end, with a monolithic clip core grabber that is complementary with undergauge cover internal taper hole, the urceolus lower end of coring is connected with core bit, be that monolithic clip core grabber is embraced rock core is motionless by promoting coring tool when coring, undergauge overlaps up contraction clip core grabber chucking and pulls off rock core.This cores being difficult for stratum broken and that easily form the column rock core, and effect is fine, and on the easy stratum of broken, loose difficult formation column rock core, poor effect when coring, and rock core is often missed and is formed empty tube.

The purpose of this utility model provides a kind of card center device that can adapt on the wire line coring instrument that various stratigraphical drillings core.

Task of the present utility model is finished as follows, it is the improvement to the card center device on the existing wire line coring instrument, it includes the undergauge cover of a fastening means inner core lower end, with a monolithic clip core grabber that is complementary with undergauge cover internal taper hole, the urceolus lower end of coring is connected with core bit, it is characterized in that: there is external diameter and prolongation of internal diameter expansion identical with it undergauge cover lower end, on the bottom diameter circumference of prolongation, uniform be fixed with at least 10 up-narrow and down-wide above arches bend to the elastic circlip sheet that canopy covers in the chamber within it, the undergauge cover is become to adapt to coring of easy formation column rock core stratum, can adapt to again and be difficult for forming the column rock core, easily broken, the double acting undergauge cover that scall is cored, drill bit inner chamber bottom below the double acting undergauge cover has a spacing jump ring sheet that can back down in the drill bit inner chamber of limited device to make it to open hidden top cover on the prolongation inwall, stop collar to the spacing outer step that can put less than the top greater than the external diameter of undergauge cover with the internal diameter that is contained in the drill bit inner chamber of top cover is finished, also can adopt on the drill bit lower sides, to be filled to few three stop screws and to realize, be equipped with one and can make the flexible stretching device of urceolus being lower than suspension arrangement urceolus stage casing.

Card center device of the present utility model because of set up one group can be hidden the jump ring sheet, and limited top cover, so can adapt to the core drilling on various stratum, it is simple in structure, reliable operation can be because of card rock core sky tin incessantly.

Below with reference to accompanying drawing and embodiment, structure of the present utility model and working condition are further described.

Fig. 1 is the structural representation of the utility model when jump ring sheet formation canopy covers;

Fig. 2 is the structural representation of the utility model when the jump ring sheet is in hidden state;

Fig. 3 is the A-A sectional drawing of Fig. 1;

Fig. 4 is the A-A sectional drawing of Fig. 2.

In Fig. 1, Fig. 2, Fig. 3, Fig. 4,1, monolithic clip core grabber, 2, double acting undergauge cover, 3, the jump ring sheet, 4, stop collar, 5, the top cover, 6, single thrust bearing, 7, core bit.

Monolithic clip core grabber 1 is contained in the tapering inner chamber of double acting undergauge cover 2, overlap the inner hole wall bottom riveting or the 10-30 sheet jump ring sheet 3 of burn-oning of the prolongation of 2 bottoms at the double acting undergauge, jump ring sheet 3 lower ends are wide, the upper end narrows down gradually, the lower end neatly is securely fixed on the prolongation lower end inner hole wall of double acting undergauge cover 2, it is crooked closely mutually also that the upper end all inwardly is arch, forms an approximate hemispherical canopy and cover.Top cover 5 is a cover parts, and it is provided with stopping means.A kind of is that its underpart is manufactured outer step, single thrust bearing 6 is housed below the step.Top cover 5 connects single thrust bearing 6 and is sitting in the dead eye of core bit 7 inner chamber bottoms, is contained in stop collar 4 in the inner chamber of core bit 7, and its lower end is pressed on the upper surface of dead eye.Stop collar 4 also is a cover parts, its internal diameter is greater than the external diameter of double acting undergauge cover 2, and less than the step external diameter on the top cover 5, there is very little gap stop collar 4 lower surfaces with the step upper surface that the top is overlapped on 5, so both defined cover 5 residing positions, top, do not hindered top cover 5 flexible rotations again with respect to core bit 7; Also can take on core bit 7 lower sides, to be filled to the mode of few three stop screws to the limiting mode of the position of top cover 5, stop screw is along circumference uniform distribution, screw axis all is in the same horizontal plane, its axis all points to the axis of core bit 7, the side of screw head is pressed in the step upper surface of top cover 5, and with the step upper surface certain interval is arranged.

The operating principle of this card center device is when needs are cored, will have at the bottom of the wire line coring instrument lower going-into-well of this device.Before core bit 7 does not contact the shaft bottom, the wire line coring instrument is in suspended state, stretching device on the instrument urceolus is in elongation state under the action of gravity of its underpart urceolus, urceolus is also along with being in elongation state, and core bit 7 is connected the urceolus lower end, so the cover of the top in the drill bit 75 is lower than the lower end of double acting undergauge cover 2, makes double acting card center device be in jump ring sheet 3 exposed states shown in Figure 2.Behind drill bit 7 contact shaft bottoms, continue to transfer drilling tool, stretching device on the coring tool urceolus is under its action of gravity with top urceolus and coring tool top drilling tool, pushed back contraction state, urceolus length returns to original length, because instrument inner core length immobilizes, so that the double acting undergauge that the inner core lower end connects overlaps is 2 descending and be enclosed within on the top cover 5, jump ring sheet 3 is backed down and hidden cylindrical and double acting undergauge at top cover 5 overlaps between the inner hole wall of 2 bottom prolongations.Double acting card center device then is in jump ring sheet 3 hidden states as shown in Figure 3.Then can carry out core-drilling this moment, and rock core is not subjected to the obstruction of jump ring sheet 3 to enter inner core.When rock core enters the inner core certain-length, when needing the card heart, ropes coring tool upwards then.Instrument then carries out the transition to suspended state gradually, and double acting concealed type card center device also will be from the hidden status transition of jump ring shown in Figure 2 to jump ring exposed state shown in Figure 3, and double acting undergauge cover 2 breaks away from top cover 5 gradually.If to run into mechanical strength low, the easy rock core of broken formation, 3 of jump ring sheets expose gradually and inserts rock core the most at last the rock core card break and seal, guarantee that the card of broken rock core is got.If run into the mechanical strength height, the rock core on breakable stratum not, 2 in double acting undergauge cover shrink monolithic clip core grabber 1, tie tight rock core and rock core pulled off of 1 of clip core grabber.The rock core card is had no progeny, and with rope inner core is proposed well, promptly finishes and cores.

Double acting concealed type card center device has also improved the shunting situation of drilling fluid when core-drilling.This device is in state shown in Figure 3 during core-drilling.Drill-in fluid is by the gap between stop collar 4 and the double acting undergauge cover 2, and most of many through holes on stop collar 4 lower end sidewalls flow into the end spray orifice of drill bit 7.Have only very a spot of drilling fluid through the gap that single thrust bearing 6 flows between drill bit 7 and the rock core, bearing is had the cleaning lubrication, bearing is rotated flexibly, guarantee the single action dependable performance of coring tool.This part drilling fluid also has the effect of lubricated rock core, and rock core is beneficial to enters inner core, and can the erosion rock core, help protecting the rock core of easy broken formation.

Claims (1)

1, a kind of card center device on the wire line coring instrument, it includes a undergauge cover that is connected the inner core lower end of coring, with a monolithic clip core grabber that is complementary with undergauge cover internal taper hole, the urceolus lower end of coring is connected with core bit, it is characterized in that: there is external diameter and prolongation of internal diameter expansion identical with it undergauge cover lower end, on the bottom diameter circumference of prolongation uniform be fixed with at least 10 up-narrow and down-wide above arches bend to the elastic circlip sheet that canopy covers in the chamber within it, drill bit inner chamber bottom below the undergauge cover has a spacing jump ring sheet that can back down in the drill bit inner chamber of limited device to make it to open hidden top cover on the prolongation inwall, is equipped with one in the urceolus stage casing that is lower than suspension arrangement and can makes the flexible stretching device of urceolus.

Images