RU2250347C2 - Hydro-isolating borehole-extracting tool - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device has drilling head, upper sub, body and borehole-receiving pipe with borehole-extractors in its lower portion. In upper portion of pipe ball support, locking valve, adjusting screw and adjusting nut are present. Borehole-receiving pipe at lower portion is additionally provided with special borehole-extractor and sub with quick-destructible lid. In upper portion of pipe a moveable locking valve is present, overlapping washing apertures of adjusting screw under effect from borehole. Ball bearing is made oil-filled. Special extractor is spring-loaded. Said lid holds hydro-isolating liquid din pipe during lowering of tool to face.

EFFECT: higher efficiency and simplified construction.

2 dwg

Description

The invention relates to the oil and gas industry, namely to drilling wells with coring.

The well-known core sampling shell KI (AS of the Russian Federation No. 2049220 class E 21 V 25/08) consisting of a burgole head, body, casing with a collet core drill and a plastic cover, a core receiver tube with a lever core drill under and a ball suspension, an adjustment screw and a shutoff valve above (analog).

The disadvantage of this projectile is the presence of a casing, which entails an increase in the dimensions of the projectile, as well as the presence of a collet core explorer in a rotating casing, which in practice is often pushed by a core receiver into the core receiver tube followed by a core pin in it.

The well-known core sample “Nedra” (Knyazev I.K. Drillers on core sampling. M. Nedra, 1981, p. 33-34 fig. 17) consisting of a burgole head, a body, a core receiver tube equipped with a core cutter at the bottom and a ball suspension washed at the top drilling fluid, adjusting screw, suspension of the core receiver tube on the body and a shut-off valve in the form of a ball (prototype).

The disadvantage of this core sampling projectile is that the core collection tube is filled with drilling fluid that penetrates the core. This entails a distortion of the hydrodynamic parameters of the core, there is no fixation on the surface of the complete filling of the core receiver pipe with the core, the ball bearing filled with drilling fluid wedges and rotates with the body, and the collet core explorer does not work when the washed core is raised and this significantly reduces the percentage of core removal.

The purpose of this invention is to improve the efficiency and simplification of the design of a coring shell waterproofing.

This goal is achieved by the fact that the core receiver tube is provided below with an additional slips core drill and a quick-breaking, under the influence of the core cover for holding waterproofing fluid in the core receiver tube when the projectile is lowered to the bottom, the adjustment screw is made with flushing holes, the shut-off valve is movable, the ball suspension is an oil while the slips of the slips core-breaker are spring-loaded with springs, and the movable shut-off valve is configured to overlap the washing holes the adjusting screw under the influence of the core.

In Fig.1 shows a General view of the core receiver projectile waterproofing, and in Fig.2 the placement of the collets in the collet core-breaker.

A waterproofing core sampler consists of a burgole head 1, an upper sub 2, a body 3, and a core receiver tube 4. A lever 5 and a slot 6 core with screw locks 15 spring-loaded springs 14, as well as an adapter 7 with a quick-breaking cover 8. are screwed into the core receiver 8 above. the oil-filled ball suspension is screwed in. 9. In turn, an adjustment screw 10 with flushing windows 13 and an adjustment nut 12 screwed onto it for suspending the core receiver tube 4 in the housing 3 is screwed in. Inside the ball suspension ki 9 has an axial hole for filling core lifter tube 4 waterproofing fluid and which sealingly overlaps the movable shut-off valve 11.

The principle of operation is as follows.

A waterproofing coring shell is dragged into the rig. Unscrew the plugs at the ends of the projectile and screw the burgole 1. They are then lowered into the well at the elevator. Unscrew the upper sub 2 and remove the core receiver tube 4 from the casing 3. Unscrew the layout of the core cutters 5; 6 and a sub 7 for installation of a cover 8 that quickly collapses under the influence of a core. Install a cover 8 in a sub 7 and wrap it. Then visually inspect the lever 5 and slips 6 core-breakers (if necessary, replace them) and wrap in a core receiver tube 4.

After all the above manipulations, the core receiver 4 is lowered into the housing 3 to the ball suspension 9. Insert the key plug into the ball suspension 9 and put on the end of the housing 3. The adjustment screw 10 is turned off, the movable shut-off valve 11 is turned off, the core reception tube 4 is filled with waterproofing liquid 16 to the saddle of the movable shut-off valve 11 and in the reverse sequence is wrapped.

Remove the open-end wrench from the ball suspension 9 and lower the core receiver tube 4 until the adjusting nut 12 fits into the housing 3 based on the presence of a gap between the ends of the lever core core 5 and the burgole head 1 2-3 mm. If necessary, adjust. Screw the upper sub 2 and the rest of the BHA for coring by rotor or turbine method.

All the collected BHA for core sampling is lowered to the face, the estimated time is washed to wash the sludge from the face and begin drilling. The well is flushed through the drill pipe string, adjusting screw 10, flushing windows 13, and then through the cavity between the body 3 and the core receiving tube 4 and flushing holes of the burgole head 1. Therefore, the drilling fluid has almost no effect on the extracted core. During drilling, the resulting core enters the burgole head 1 and, rising, alternately enters the lever core cutter 5, raising the levers, the slips core cutter 6, shifting the slips 15 upward on the conical surface and thereby spreading them radially, increasing the flow area to the optimum. The springs 14 are compressed. Moving along the core receiver tube 4, the core rests against the plastic cover 8 with the upper end, destroying it. In this case, the waterproofing fluid 16, located in the core collection tube 4, envelops the core, preventing the penetration of the mud filtrate.

When the core receiving tube is completely filled with the core, it abuts against the movable shut-off valve 11 with the upper end and, with further deepening, raises the movable shut-off valve 11. The latter, in turn, moves upward under the influence of the core and closes the flushing holes 13 of the adjusting screw 10. The pressure of the injected drilling fluid increases, which is fixed on the surface by increasing pressure on the manifold. After that, drilling is stopped and, having carried out the process of tearing the core from the bottom by a known method, they lift the core receiving shell to the surface to extract the core.

Separation of the core and its subsequent retention occurs in weakly cemented rocks due to the initial position of the levers of different lengths of the core core 5, which cover most of the internal cavity of the core core 5. In medium-hard rocks due to the levers of the smallest length and due to the spring loaded slips 15, which under by the action of springs 14 and due to friction against the core, they fall down along the conical surface, reducing the cross-sectional area of the internal cavity, therefore, jamming the core in the core receiver tube 4. In hard and strong rocks, levers of different lengths slide along the core and do not penetrate into it, therefore, detachment and retention of it occurs only due to slips 15.

An increase in the percentage of high-quality core removal allows a more detailed study of the hydrodynamic parameters of the productive formation, which in turn contributes to an increase in the production of formation fluid, and a simplification of the design of the core sampling shell allows the core to be selected at a lower cost.

Claims (1)

A waterproofing coring shell, consisting of a burgole head, upper sub, body and core receiver, equipped with core drills in the lower part, and a ball suspension in the upper part, a shut-off valve, an adjusting screw and an adjusting nut, characterized in that the core receiver is equipped with an additional slips core and bottom core a cover that quickly collapses under the influence of the core to hold the waterproofing liquid in the core receiver tube when the projectile is lowered to the bottom; the adjustment screw is made with by flushing holes, the shutoff valve is movable, the ball suspension is oil-filled, while the slips of the slips core-breaker are spring-loaded, and the movable shut-off valve is configured to overlap the flushing holes of the adjusting screw under the influence of the core.

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