CN201152898Y - Shallow layer core fetching tool for oil and seismic exploration - Google Patents

Abstract

The utility model relates to a shallow coring tool for oil and seismic exploration which comprises an upper adaptor, a shunting adaptor, an outer cylinder, an inner cylinder, a pressing cap, a bearing mandril, a bearing, a steel ball, a sealing ring, a regulating ring, a lower adaptor, a rock core claw and a drill. The upper end of the outer cylinder is connected with the upper adaptor through a screw thread; the inner cylinder is arranged inside the outer cylinder; the upper end of the inner cylinder is connected with the shunting adaptor through a screw thread; the upper end and the lower end of the shunting adaptor are respectively connected with the upper adaptor and the inner cylinder. The bearing mandril and the bearing are arranged between the upper adaptor and the shunting adaptor; the pressing cap is arranged outside the bearing; the upper end of the pressing cap is connected with the lower adaptor, and the steel ball is arranged inside the shunting adaptor. The lower end of the outer cylinder is connected with the drill, the lower end of the inner cylinder is connected with the lower adaptor and the rock core claw is arranged inside the lower adaptor. The shallow coring tool for oil and seismic exploration has simple structure and reliable operation, and can be used for acquiring rock samples directly from underground; the accuracy is fairly high, and the acquired rock cores are more suitable for a fine lithological stratification, tracing the optimal requirement of stimulating the lithology, improving the accuracy of the shallow geological data in the seismic exploration and benefiting to provide a reliable basis for the choice of the well depth in the production design.

Description

A kind of oil seismic exploration shallow-layer coring tool

Technical field:

The utility model relates to a kind of specific purpose tool of seismic exploration by land that is used for.

Background technology:

Oil seismic exploration by land, especially in the high precision seismic exploration process, be to improve the deep reflex energy, best excitation well depth definite significant, but because the difference of top layer, different regions seismic geological codition determines that the best excites lithology and excites the degree of depth to have certain difficulty.For getting the shallow-layer underground structure clear, direct, the most effective means of core well logging conduct, scene not widespread use as yet at present, and carry out the core well logging by getting core equipment, can accurately understand surface structure, for best excitation well depth determine reliable basic data is provided, long-range importance is arranged.Yet, because surface structure is loose, lithological change is big, the coring tool that is used for engineering construction and drills through core greatly is the actual needs of seismic exploration contentedly, the on-the-spot at present method that adopts usually is in drilling process, and by the outer circulation of rig, mud carries the kukersite medium from returning ground in the well, pull rock sample with spade in the ditch out returning then, carry out lithology logging.The shortcoming of this kind method is because the shallow-layer rock sample is blended by drill bit easily, to be embedded the rock sample that mud and last layer do not return up, return ground off and on, thereby, can not accurately determine the lithology and the degree of depth thereof, bigger for its error rate of lithological change larger area especially.

The utility model content:

The purpose of this utility model is to provide a kind of oil seismic exploration shallow-layer coring tool that obtains core, reliable operation in the oil seismic exploration process, help providing accurate top layer lithology and degree of depth data thereof.

The utility model is to realize like this.This kind coring tool is made up of top connection, tap, urceolus, inner core, pressure cap, bearing spindles, bearing, steel ball, lower sub, core pawl, drill bit, the urceolus upper end is connected with the top connection lower end by screw thread, be provided with inner core in the urceolus, there is tap the inner core upper end by the screw thread tipping, and the tap upper and lower end is connected with inner core with top connection respectively by screw thread; Be provided with bearing spindles and bearing between top connection and the tap, the bearing outside is provided with pressure cap, and its upper end is connected with lower sub, is provided with steel ball in the tap; The urceolus lower end is connected with drill bit by screw thread, and the inner core lower end is connected with lower sub by screw thread, is provided with the core pawl in the lower sub.During coring, this instrument is hinged with in the drilling tool bottom.When core drill advances, locked and enter in the inner core by the core pawl, about each drilling depth 1-2m, can unload coring tool at well head after the trip-out, rock sample is taken out along with drill bit creeps into the mantle rock core.This coring tool creeps into and promotes in the hydraulic pressurization mode, has the revolution self-lock ability, and inside and outside tube diameter is moderate, helps improving coring recovery rate.Because adopt the PVC plastics inner core of inner wall smooth, it is less that core is gone into a resistance.Adopt self-locking core pawl, when core drill advanced, the core pawl was in open configuration, and core is gone into tube easily, and when getting the core lifting, the relative lower sub of core pawl is done and moved downward diameter reduction locking core, guarantees that core is difficult for dropping out from inner core.Owing to adopt the scraper type coring bit, can guarantee to get the core borehole diameter, through the bit port ejection, protection bottom core former state is not destroyed circulation fluid from inside and outside tube simultaneously.

The utility model is simple in structure, reliable operation, utilize it can be directly from the underground rock sample that obtains, and very high accuracy is arranged, the core of obtaining is more suitable in meticulous lithology layering, follows the trail of the best requirement that excites lithology, improve the accuracy of seismic prospecting shallow-layer geologic information, help providing reliable basis for producing dark the choosing of planned well.

Description of drawings:

Accompanying drawing is a structural representation of the present utility model.

Embodiment:

As shown in the figure, the utility model is made up of top connection 1, urceolus 2, pressure cap 3, bearing spindles 4, bearing 5, tap 6, steel ball 7, inner core 8, lower sub 9, core pawl 10 and drill bit 11, its structure, assembled relation are as follows: urceolus 2 upper ends are connected with top connection 1 lower end by screw thread, be provided with inner core 8 in the urceolus 2, there is tap 6 inner core 8 upper ends by the screw thread tipping, and tap 6 upper and lower ends are connected with inner core 8 with top connection 1 respectively by screw thread; Be provided with bearing spindles 4 and bearing 5 between top connection 1 and the tap 6, bearing 5 outsides are provided with pressure cap 3, and its upper end is connected with lower sub 9, is provided with steel ball 7 in the tap 6; Urceolus 2 lower ends are connected with drill bit 11 by screw thread, and inner core 8 lower ends are connected with lower sub 9 by screw thread, are provided with core pawl 10 in the lower sub 9.This coring tool length overall 3m, but coring length 2.2m, diameter 62mm.Wherein, urceolus 2 diameters are 101.6mm, and inner core 8 diameters are 76.2mm, the core pawl 10 minimum-value aperture 60mm that is honored as a queen entirely, drill bit 11 external diameter 106mm or 114mm.Top connection 1 upper and lower end is respectively equipped with the drilling rod that uses with WT-50, WT-100 type rig and is connected with tap 6 and uses internal thread, upper outside to have dozen pipe wrench with six sides.Tap 6 upper and lower ends are respectively equipped with to be connected with inner core 8 with top connection 1 uses external thread, and the middle part is along circumferentially being evenly equipped with a plurality of drilling fluids shunting circular holes, and it is built-in with steel ball 7.Bearing spindles 4 and bearing 5 are arranged between top connection 1 and the tap 6, can make inner core 8 with respect to urceolus 2 transfixions when its effect is rotary drilling.Core pawl 10 adopts the self-locking structure, and inwall is provided with the locking core with blocking tooth, and a side is provided with longitudinal opening, and material adopts 65Mn, and does modifier treatment.Drill bit 11 adopts winged scraping bit, and its underpart is along circumferentially being evenly equipped with a plurality of ejection circulation fluid hydrophthalmias.

Claims (1)

1, a kind of oil seismic exploration shallow-layer coring tool, form by top connection (1), urceolus (2), pressure cap (3), bearing spindles (4), bearing (5), tap (6), steel ball (7), inner core (8), lower sub (9), core pawl (10) and drill bit (11), its sign is: urceolus (2) upper end is connected with top connection (1) lower end by screw thread, be provided with inner core (8) in the urceolus (2), there is tap (6) inner core (8) upper end by the screw thread tipping, and tap (6) upper and lower end is connected with inner core (8) with top connection (1) respectively by screw thread; Be provided with bearing spindles (4) and bearing (5) between top connection (1) and the tap (6), bearing (5) outside is provided with pressure cap (3), and its upper end is connected with lower sub (9), is provided with steel ball (7) in the tap (6); Urceolus (2) lower end is connected with drill bit (11) by screw thread, and inner core (8) lower end is connected with lower sub (9) by screw thread, is provided with core pawl (10) in the lower sub (9).

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