CN201024965Y

CN201024965Y - Pumping and drawing cutting ejection preventer

Info

Publication number: CN201024965Y
Application number: CNU2007200360229U
Authority: CN
Inventors: 储明来; 丁健林; 朱一星
Original assignee: Petroleum Engineering Tech Research Inst Of Jiangsu Oil Field Branch Sinopec
Current assignee: Petroleum Engineering Tech Research Inst Of Jiangsu Oil Field Branch Sinopec; Sinopec Jiangsu Oilfield Co
Priority date: 2007-04-19
Filing date: 2007-04-19
Publication date: 2008-02-20
Anticipated expiration: 2017-04-19

Abstract

The utility model discloses a sucking and cutting blowout preventer in the field of the under-well operating device in the oil field, including a body which is provided with a longitudinal channel and a horizontal channel which are crossed with each other. One end of the body is provided with a double-direction oil cylinder which is internally provided with a piston and the other end of the body is provided with an end cover which has a covering horizontal changed, with a fixing knife, which is provided with a through at a place opposite to the longitudinal hole, arranged on the horizontal channel.

Description

Preventer is sheared in pumping

Technical field

The utility model relates to a kind of oilfield downhole operation device, particularly a kind of a kind of rig tool that prevents blowout when being used for Pressure Curve in Oil Testing Well pumping discharge opeing.

Background technology

Blowout out of control is the catastrophic failure that character is serious in the underground work, loss is huge.In case the generation blowout out of control will make petroleum resources be subjected to heavy damage, also easily lead to fire, cause casualties, equipment damages, the oil gas well is scrapped, natural environment suffers severe contamination.

Must carry out formation testing to oil well before bringing in, so that further be familiar with the oil reservoir characteristic, it is one of discharge opeing body method relatively more commonly used in the formation testing that existing technology adopts the pumping method.Because the effect of oil well pumping, the negative pressure of generation and might cause induced flow, in case blowout takes place, claimed apparatus can seal well head rapidly, or device can cut off the pumping wire rope rapidly, realizes sealing well head (all reaching more than the 15Mpa) simultaneously.There is a kind of pumping hydraulic blow out preventer (ZL97204805.7) mainly to comprise the preventer body in the prior art, body is provided with and is vertical passage and the interconnection that cross intersects, the body two ends are provided with two-way cylinder, be provided with piston in the two-way cylinder, the piston rod end is provided with the flashboard that stretches in the interconnection, during use, vertical passage on pumping instrument and the steel wire penetrating body is gone into the well, two-way cylinder promotes flashboard makes the flashboard obvolvent of two two-way cylinders on wire rope, can prevent in the formation testing process and cause the borehole fluid leakage phenomena because the pumping wire rope is difficult for sealing, though this device can be realized fast sealing pumping wire rope, but this preventer sealing load is low, because the wire rope surface irregularity, general sealing load is less than 5Mpa, than higher well, this preventer does not have sealing effectiveness for bottom pressure.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of pumping to shear preventer, makes it can cut off the pumping wire rope rapidly, realizes the sealing well head simultaneously.

For achieving the above object, preventer is sheared in the pumping that the utility model provides, comprise body, body is provided with and is vertical passage and the interconnection that cross intersects, body one end is provided with two-way cylinder, be provided with piston in the two-way cylinder, the body other end is provided with the end cap that covers interconnection, be provided with dead knife in the described interconnection, be provided with through hole with the vertical passage correspondence position on the dead knife, the piston rod free end shaft of piston is in stretching into interconnection, and the free end of piston rod is provided with the movable blade that can cover through hole on the dead knife, and the inward flange of through hole cooperates the formation cutting edge with the tip of movable blade.

When the utility model uses, be fixed in well head, pumping instrument and wire rope enter the down-hole by vertical passage, in the pumping process, in case the generation blowout, two-way cylinder one side oil-feed, piston promotes movable blade and moves, movable blade and dead knife produce shearing motion, rapidly wire rope is cut off, piston continues to promote movable blade and moves, and covers through hole on the dead knife, thereby close the sealing well head, eliminate blowout hidden danger.Compared with prior art, this uses novel shearing force big, in case blowout takes place, can cut off wire rope rapidly in 8s, even well head pressure reaches more than the 15Mpa, also can close well head rapidly, eliminates blowout hidden danger; Its volume is little, and is in light weight, easy for installation, can be applicable to the bigger well mouth of oil well of pressure.

For making the well mouth of oil well good seal, the upper surface of described movable blade is provided with the round seal that matches with the interconnection upper wall, and when movable blade was covered on the dead knife through hole, round seal was sealed between the vertical passage on interconnection and movable blade top.In movable blade when action, drive that round seal moves and the vertical passage on interconnection and movable blade top is isolated, makes the thorough seal isolation of oil well interior or exterior space, avoided leakage.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the working state schematic representation of wire rope after cutting off;

Wherein, 1, piston; 2, two-way cylinder; 3, piston rod; 4, movable blade; 5, body; 6, vertical passage; 7, dead knife; 8, end cap; 9, interconnection; 10, through hole; 11, wire rope; 12, round seal.

The specific embodiment

As Fig. 1, shear preventer for pumping, comprise body 5, body 5 is provided with and is vertical passage 6 and the interconnection 9 that cross intersects, and during work, body 5 is fixed on well head, and pumping means and wire rope 11 pass vertical passage 6 and enter the down-hole; Body 5 one ends are provided with two-way cylinder 2, and two-way cylinder 2 two ends are provided with two oil inlet and outlets of A, B, and during one of them hydraulic fluid port oil-feed, another hydraulic fluid port is fuel-displaced, and correspondingly piston 1 is pushed to oil-out one end; Be provided with piston 1 in the two-way cylinder 2, body 5 other ends are provided with the end cap 8 that covers interconnection 9, be provided with dead knife 7 in the described interconnection 9, be provided with through hole 10 with vertical passage 6 correspondence positions on the dead knife 7, piston rod 3 free end shaft of piston 1 are in stretching into interconnection 9, the free end of piston rod 3 is provided with movable blade 4, and movable blade 4 can be covered the through hole 10 on the dead knife 7 when shearing, and the inward flange of through hole 10 cooperates the formation cutting edge with the tip of movable blade 4; For making the well mouth of oil well good seal, the upper surface of described movable blade 4 is provided with the round seal 12 that matches with the upper wall of interconnection 9, when movable blade 4 was covered on the dead knife through hole 10, as shown in Figure 2, round seal 12 was sealed between the vertical passage 6 on interconnection 9 and movable blade top.

In case generation blowout, the A hydraulic fluid port oil-feed of two-way cylinder 2, piston rod 3 promotes movable blade 4 to a side shifting, promoting wire rope 11 simultaneously moves, when wire rope 11 contacts with dead knife 7 with movable blade 4 simultaneously, movable blade 4 is cut off wire rope 11 rapidly, piston rod 3 continues to promote 4 of movable blade and moves right, movable blade 4 is covered the through hole 10 on the dead knife 7, in the movable blade action, round seal 12 moves and the vertical passage on interconnection and movable blade top is isolated, makes the thorough seal isolation of oil well interior or exterior space, thoroughly close the sealing well head, eliminate blowout hidden danger.Move to opposite side when the oil-feed of the B of two-way cylinder hydraulic fluid port promotes movable blade 4, movable blade 4 is got back to the origin-location, thereby opens well head.

Claims

1. preventer is sheared in a pumping, comprise body, body is provided with and is vertical passage and the interconnection that cross intersects, body one end is provided with two-way cylinder, be provided with piston in the two-way cylinder, it is characterized in that: the body other end is provided with the end cap that covers interconnection, be provided with dead knife in the described interconnection, be provided with through hole with the vertical passage correspondence position on the dead knife, the piston rod free end shaft of piston is in stretching into interconnection, the free end of piston rod is provided with the movable blade that can cover through hole on the dead knife, and the inward flange of through hole cooperates the formation cutting edge with the tip of movable blade.

2. preventer is sheared in pumping according to claim 1, it is characterized in that: the upper surface of described movable blade is provided with the round seal that matches with the interconnection upper wall, when movable blade was covered on the dead knife through hole, round seal was sealed between the vertical passage on interconnection and movable blade top.