CN201372752Y - Fiber reinforced plastics (FRP) suspension device for coring inner barrels - Google Patents

Abstract

The utility model relates to a fiber reinforced plastics (FRP) suspension device for coring inner barrels used in petroleum natural gas coring operation. The suspension device comprises an upper connector(1), a floating tube (2), a seal ring (3), a mandrel (4), a crossover coupling (5), and a spring (6), wherein, the outer step surface at the lower end of the upper connector (1) is matched with the inner step surface at the upper end of the floating tube (2); the outer step end surface of the upper connector (1) is propped against the inner step end surface of the floating tube (2); the mandrel (4) is in threaded connection with the upper connector (1); the inner surface of the floating tube (2) is in clearance fit with the outer surface of the mandrel (4); the width of the lug boss at the lower end of the mandrel (4) is smaller than that of the inner groove in the crossover coupling (5); the spring (6) is arranged in the mandrel (4); and the O-type seal ring is arranged between the upper connector (1) and the floating tube (2). The utility model has the advantages that the structure is simple; the operation is safe and reliable; the site operation is convenient; and the axial tension of the FRP inner barrel caused in the core breaking operation can be transferred to an outer barrel, so that axial damage to the inner barrel is avoided.

Description

A kind of glass fiber reinforced plastic inner core suspension arrangement of coring

Technical field

The utility model relates to the aid that petroleum gas core drilling operation is used, and particularly a kind of glass fiber reinforced plastic inner core suspension arrangement of coring belongs to the downhole tool class.

Background technology

Compare with conventional centering technique technology, glass fiber reinforced plastic inner core CORING TECHNOLOGY has remarkable advantages: this instrument improves rock core intensity by increasing core diameter, and adopt the glass fiber reinforced plastic inner core of inner wall smooth to go into a resistance, thereby guaranteed the core recovery of coring at scall to reduce rock core; In the sampling preparation process of rock core, directly cut inner core and carry out sampling, reduced the impaired probability of rock core, guaranteed the rock core shaping rate of coring, thereby improved the success rate of rock core sampling at scall.

Glass fiber reinforced plastic inner core coring tool has been obtained good result of use in the use of reality.But, because glass fiber reinforced plastic inner core coring tool is generally developed at scall, be subjected to the restriction of glass fiber reinforced plastic inner core tensile strength, when heart operation is cut on big in variation of lithological, as can not accurately to predict cementing strength stratum, the glass fiber reinforced plastic inner core might be subjected to axial tension and be damaged under the effect of cutting heart reversal interlocking relay, and then make the shaping rate of rock core be difficult to be protected, limited the scope of application of instrument.

Summary of the invention

The purpose of this utility model is to develop a kind of glass fiber reinforced plastic inner core suspension arrangement of coring, in coring operation, when the heart is cut on the high stratum of brill chance cementing strength, the heart reversal interlocking relay that cuts that the glass fiber reinforced plastic inner core can be born is transferred on the urceolus, bear by urceolus and to cut heart pulling force and come core breaking, thereby guarantee the smooth implementation of glass fiber reinforced plastic inner core centering technique.

For achieving the above object, the technical scheme of employing of the present utility model is: mainly be made up of top connection, the pipe that floats, sealing ring, axle, crossover sub, spring, the outer step surface of top connection lower end matches with the interior step surface of the pipe upper end of floating, and the outer step end face of top connection and the interior step end face of unsteady pipe offset; The axle upper end has screw thread to be connected with the internal thread of top connection lower end; The inner surface of unsteady pipe and the external surface of axle form matched in clearance; Crossover sub has inner groovy, and the axle lower end is a boss, and the width of this boss is less than the width of inner groovy in the crossover sub, the built-in spring in space that boss and groove form; Between top connection and the unsteady pipe sealing device is arranged, adopt the O RunddichtringO to seal between the two.

Advantage of the present utility model is: simple in structure, safe and reliable, execute-in-place is convenient, the suffered axial tension of glass fiber reinforced plastic inner core in cutting heart operation can be transferred on the urceolus, has avoided the axial infringement of inner core.

Description of drawings

Fig. 1 is the utility model structural representation.

Specific embodiments

The utility model is described in more detail below in conjunction with accompanying drawing.

The utility model mainly is made up of top connection 1, the pipe 2 that floats, sealing ring 3, axle 4, crossover sub 5, spring 6, it is characterized in that: the outer step surface of top connection 1 lower end matches with the interior step surface of pipe 2 upper ends of floating, and the outer step end face of top connection offsets with the interior step end face of the pipe 2 that floats; Axle 4 upper ends have screw thread to be connected with the internal thread of top connection 1 lower end; The inner surface of unsteady pipe 2 and the external surface of axle 4 form matched in clearance; Crossover sub 5 has inner groovy, and axle 4 lower ends are boss, and the width of this boss is less than the width of inner groovy in the crossover sub 5, the built-in spring 6 in space that boss and groove form; Between top connection 1 and the unsteady pipe 2 sealing device is arranged, adopt O RunddichtringO 3 to seal between the two.

Operating principle of the present utility model: the pretightning force that the spring in the utility model 6 is set is a certain value in advance, and this pretightning force is greater than at the suffered maximum working load of each stage suspension arrangement of coring, and less than the maximal work load of glass fiber reinforced plastic inner core.The utility model is connected on core barrel top, G.I.H, in the operating process of coring, when bore meeting scall when cutting heart operation, its operating principle operating principle preceding with this device is not installed is identical; Promptly when the high hard formation of brill chance cementing strength cuts heart operation, cut the pretightning force that heart reversal interlocking relay is set greater than spring 6, cut under the effect of heart reversal interlocking relay at this, the glass fiber reinforced plastic inner core will be with crossover sub 5 and the pipe 2 that floats moves down, make the core grabber cover that is connected with the glass fiber reinforced plastic inner core be sitting on the drill bit inner chamber step surface, instrument just can come core breaking by urceolus is stressed, thereby has guaranteed the functional reliability of glass fiber reinforced plastic inner core.

Claims (2)

1, a kind of glass fiber reinforced plastic inner core suspension arrangement of coring, mainly form by top connection (1), float pipe (2), sealing ring (3), axle (4), crossover sub (5), spring (6), it is characterized in that: the outer step surface of top connection (1) lower end matches with the interior step surface of pipe (2) upper end of floating, and the outer step end face of top connection offsets with the interior step end face of the pipe (2) that floats; Axle (4) upper end has screw thread to be connected with the internal thread of top connection (1) lower end; The inner surface of unsteady pipe (2) and the external surface of axle (4) form matched in clearance; Crossover sub (5) has inner groovy, and axle (4) lower end is a boss, and the width of this boss is less than the width of inner groovy in the crossover sub (5), the built-in spring in space (6) of boss and groove formation; Between top connection (1) and the unsteady pipe (2) sealing device is arranged.

2, a kind of glass fiber reinforced plastic according to claim 1 inner core suspension arrangement of coring is characterized in that: top connection (1) and float and adopt O RunddichtringO (3) to seal between the pipe (2).

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