CN2918706Y - Slim-hole drill-follow reamer - Google Patents

Abstract

The utility model relates to a small well hole expander arranged on an aiguille, comprising an upper connector, a lower connector, a piston device, an indicator seat, a hydraulic cylinder, a restoring spring, a spring seat, an inclined guiding body, a main body, an expanding tool and a spacing sleeve, wherein the indicator seat is a cylinder, on which a piston, a piston rod and the inclined guiding body are arranged at the bottom in turn; the restoring spring is arranged in the circular space between the piston rod and the hydraulic cylinder; the spring seat is arranged under the restoring spring; the inclined guiding body is a hollow multidiameter cylinder, on which a plurality of symmetrical swallow-tailed chutes are positioned on the outer wall; a plurality of symmetrical square holes and water holes inclined upwards are positioned on the pipe wall of the main body; the expanding tool is arranged in the square hole; the spacing sleeve is arranged at the bottom of the main body; water holes inclined upwards communicated with the water holes on the main body are positioned along the circumference of the spacing sleeve wall. The utility model can keep the trace of the well hole and realize the operation of simultaneous well drilling and expanding so as to improve the working efficiency and reliability and extend the service life.

Description

Slim-hole enlarging while drilling device

Technical field: the utility model relates to a kind of slim-hole enlarging while drilling device, belongs to the reaming tool technical field of drilling engineering construction downhole tool, particularly casing window sidetracking slim-hole.

Background technology: in oil drilling, for solving 5  " casing window sidetracking well bore hole section hole diameter is less than normal, be lowered to sleeve pipe after the annular clearance introductory note play the cementing quality problem; need carry out reaming to barefoot interval; traditional expanding method is after the well of the intact certain diameter of a bit drills; propose drilling tool in the well; replace other drill bit again and carry out reaming, this method technology is loaded down with trivial details, influence bit speed, increase drilling cost.Existing a kind of synchronous reamer can overcome above-mentioned shortcoming, it can be in drilling process bores for one time in same pit shaft and finishes the neck eye and creep into and chambering process, thereby have one a bit change program of saving, simplify the advantage of drilling well operation, this reamer is mainly by main body, the piston mandrel, spring, positioning sleeve, jacking block, screw, scraper, nozzle mechanism, compositions such as pin, scraper is fixed in the main body by pin as broad, have teeth above the scraper, these teeth and the teeth interlock above the mandrel rod, during work, under ground slush pump pressure promotes, high pressure liquid stream compression piston mandrel, make the teeth of mandrel bottom and the mutual interlock of teeth of scraper, force scraper to open,, continue to enlarge well the well that pilot bit bored.But this reamer has the following disadvantages: complex structure, reliability are low, and the life-span is short; After scraper opened, radial dimension was bigger, and cutting resistance is big, and the cutting grain that cuts during reaming is thick, and " casing window sidetracking well drilling fluid is taken on the sand and returned to be unfavorable for 5  that hole diameter is less than normal.

Summary of the invention: the purpose of this utility model is in order to overcome above-mentioned shortcoming, " to carry out the slim-hole reaming in the casing window sidetracking well process, make the cutting grain of cutting tiny, help drilling fluid and take the slim-hole enlarging while drilling device that returns on the sand and provide a kind of at 5 

The utility model is by last, lower contact, piston apparatus, the indicator seat, fluid cylinder, back-moving spring, spring base, lead italic, body, broad, stop collar is formed, top connection is on being provided with, the tubular body of following screw thread, the top connection upper end is connected with drilling rod, lower end and fluid cylinder are by being threaded, the indicator seat is a cylinder, axially open some symmetrical circular holes along circumference, place in the top connection centre bore, indicator seat lower end is equipped with piston successively, piston rod and lead italic, place back-moving spring in the annular space between piston rod and fluid cylinder, the lower end of back-moving spring is a spring base, the top of spring base and fluid cylinder be by being threaded, and bottom and body are by being threaded; Leading italic is a ladder hollow cylinder, and its outer tube wall is processed with several symmetrical dovetail type skewed slots; Body is a cylinder hollow pipe, and the upper end is threaded with spring base, and the lower end is connected with lower contact, have some symmetrical square holes on the tube wall and be tilted to hydrophthalmia, place broad in square hole, the bottom of broad is a dovetail shaped, and leads the dovetail type skewed slot of opening on the italic outer tube wall and cooperatively interacts; Stop collar is loaded on the body bottom, has the hydrophthalmia that is tilted to that communicates with institute's boiling water eye on the body along the circumferencial direction of stop collar tube wall, is used to wash broad.

The invention effect: 1, the italic of leading of the present utility model is split into the dovetail type inclined-plane, and broad is gently opened, and prevents that effectively cutter from moving radially along the inclined-plane, guarantees well track.

2, broad is equipped with the PDC composite sheet, and blade arrangement is for arranging from low to high, expands the aperture that and progressively becomes big by little, makes the cutting grain of cutting in small, broken bits, is beneficial to carrying of drilling fluid.

The utility model can be realized while boring also increasing work efficiency and reliability outside the chambering process, and length increases the service life.

Description of drawings: accompanying drawing 1 is the utility model structure diagram;

Accompanying drawing 2 is led the sectional drawing of italic dovetail type skewed slot for broad is contained in;

The specific embodiment: the utility model is described further below in conjunction with accompanying drawing:

By accompanying drawing 1, accompanying drawing 2 as can be known, the utility model is by last, lower contact 1,12, indicator seat 2, piston 3, piston rod 4, fluid cylinder 6, back-moving spring 5, spring base 7, lead italic 9, body 8, broad 10, stop collar 11 is formed, top connection 1 is on being provided with, the tubular body of following screw thread, top connection 1 upper end is connected with drilling rod, lower end and fluid cylinder 6 are by being threaded, indicator seat 2 is a cylinder, axially open some symmetrical throttle orifices along circumference, place in top connection 1 centre bore, indicator seat 2 lower ends are equipped with piston 3 successively, piston rod 4 and lead italic 9, place back-moving spring 5 in the annular space between piston rod 4 and fluid cylinder 6, the lower end of back-moving spring 5 is a spring base 7, the top of spring base 7 and fluid cylinder 6 be by being threaded, and bottom and body 8 are by being threaded; Leading italic 9 is a ladder hollow cylinder, and its outer tube wall is processed with several symmetrical dovetail type skewed slots; Body 8 is a cylinder hollow pipe, the upper end is threaded with spring base 7, the lower end is connected with lower contact 12, have some symmetrical square holes on body 8 tube walls and be tilted to hydrophthalmia, in square hole, place broad 10, the bottom of broad is a dovetail shaped, and leads the dovetail type skewed slot of opening on italic 9 outer tube walls and cooperatively interacts; Stop collar 11 is loaded on body 8 bottoms, has the hydrophthalmia that is tilted to that communicates with institute's boiling water eye on the body 8 along the circumferencial direction of stop collar 11 tube walls.

During work, drilling fluid is under ground slush pump pressure promotes, high pressure liquid stream causes chock pressure difference for piston 3 by the throttle orifice of the indicator seat 2 in the top connection 1, promote piston rod 4 downwards successively, lead italic 9, the dovetail type inclined-plane of leading italic 9 radially launches broad 10, to the drilling well eye reaming of bottom drill bit institute, at this moment, the liquid stream that enters piston rod 4 inner chambers is cleaned broad 10 by the hydrophthalmia directive broad 10 on stop collar 11 and the body 8; After the termination of pumping, the high pressure liquid stream in the well stops to flow, and piston 3 pressure reduction disappear, and back-moving spring 5 work make piston 3, piston rod 4 and lead upward motion on the italic 9, and broad 10 reclaims.Broad is 4 PDC wings, and the layout of wing upper slitter piece arranges from low to high, and expanding the aperture that like this is progressively to become big by little, makes the cutting grain of cutting in small, broken bits, is beneficial to carrying of drilling fluid.

Claims (1)

1, a kind of slim-hole enlarging while drilling device, by upper and lower joint (1), (12), indicator seat (2), piston (3), piston rod (4), fluid cylinder (6), back-moving spring (5), spring base (7), lead italic (9), body (8), broad (10), stop collar (11) and form, it is characterized in that top connection (1) is for being provided with the tubular body of upper and lower screw thread, the upper end is connected with drilling rod, and lower end and fluid cylinder (6) are by being threaded; Indicator seat (2) is a cylinder, axially open some symmetrical throttle orifices along circumference, place in top connection (1) centre bore, indicator seat (2) lower end is equipped with piston (3), piston rod (4) successively and leads italic (9), place back-moving spring (5) in the annular space between piston rod (4) and fluid cylinder (6), the lower end of back-moving spring (5) is spring base (7), and the top of spring base (7) and fluid cylinder (6) be by being threaded, and bottom and body (8) are by being threaded; Leading italic (9) is a ladder hollow cylinder, and its outer tube wall is processed with several symmetrical dovetail type skewed slots; Body (8) is a cylinder hollow pipe, the upper end is threaded with spring base (7), the lower end is connected with lower contact (12), have some symmetrical square holes on body (8) tube wall and be tilted to hydrophthalmia, in square hole, place broad (10), the bottom of broad (10) is a dovetail shaped, and leads the dovetail type skewed slot of opening on italic (9) outer tube wall and cooperatively interacts; Stop collar (11) is loaded on body (8) bottom, has the hydrophthalmia that is tilted to that communicates with institute's boiling water eye on the body (8) along the circumferencial direction of stop collar (11) tube wall.

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