CN102733797A - Safe pulling-out indicator - Google Patents

Abstract

The invention provides a safe pulling-out indicator. The indicator consists of a cylindrical testing section, a sensor and an alarm; the cylindrical testing section is made of a non-magnetic material, one end of the cylindrical testing section is connected with the upper end of a lower catcher, and the other end of the cylindrical testing section is connected with the lower end of a blowout prevention pipe; the sensor is arranged on the outer wall of the cylindrical testing section; and the signal output end of the sensor is connected with the alarm. The safe pulling-out indicator can accurately measure the distance between the end of a steel wire (a cable/a continuous oil pipe) to a well mouth, and gives an alarm signal to an operator to avoid the condition that a tool string is dragged at the upper catcher to drop into a well, and well blowout accidents are caused by pulling the end of the steel wire (the cable/the continuous oil pipe) out of a blowout prevention box due to the errors of a mechanical/electronic depth metering device and the negligence of the operator.

Description

Safety trips out indicator

Technical field

The invention belongs to oil gas field with completion, well logging and workover treatment instrument technical field, be specifically related to a kind of safety and trip out indicator, be applicable to the operation and the exploitation in fields such as oil, natural gas, coal bed gas and shale gas.

Background technology

In oil gas well completion, well logging and workover treatment process; The dark device of mechanical/electrical meter is all demarcated the degree of depth of going into the well through the length that the metering winch is transferred steel wire (cable or coiled tubing), therefore has certain degree of depth error in dipping, and can further increase along with the degree of depth of going into the well increases error; Owing to there is degree of depth error in dipping; Cause tripping out operating process and have potential safety hazard, severe patient can cause tool string to be dragged coming off well or steel wire (cable/coiled tubing) in the blowout prevention box, to be extracted out, and possibly cause accidents such as blowout; Cause great potential safety hazard, therefore be necessary to improve.

Summary of the invention

The technical problem that the present invention solves: provide a kind of safety to trip out indicator; Survey an artificial situation of steel wire (cable or coiled tubing) in the appointed part lubricator through external sensor; When this position induced signal is stablized, explain that the end of steel wire in the process of tripping out (cable/coiled tubing) does not also reach the position that requires apart from well head; Explain that when this position induced signal changes steel wire (cable/coiled tubing) end has arrived in the distance of well head requirement, this moment, alarm sent alarm signal to the operator, and the notifying operation person is slowed down, and shut down and shut-in well.

The technical scheme that the present invention adopts: safety trips out indicator; Said indicator is made up of cylindrical test joint, sensor and alarm; Said cylindrical test joint is processed by non-magnet_conductible material, and cylindrical test is connected on saving an end and following catcher, and the other end is connected with the lubricator lower end; Said sensor is installed on the outer wall of cylindrical test joint, and the sensor signal output is connected with alarm.

Preferably, said sensor is an induction coil, and saves on the outer wall in cylindrical test with the clip form fix.

Preferably, said sensor is a magnetic induction switch, and said magnetic induction switch is installed on the cylindrical test joint outer wall, and the calibration position of the measured object that in cylindrical test joint, passes through is equipped with weak magnet steel.

Further, said non-magnet_conductible material is stainless steel or TC4 titanium alloy.

The present invention compared with prior art can accurately measure steel wire (cable/coiled tubing) end and send alarm signal apart from the distance of well head and to the operator, has avoided dragging initiation is pulled out in come off well accident and steel wire (cable/coiled tubing) end by the blowout prevention box gas blowout accident at last catcher place because the dark directional error of mechanical/electrical meter and operator neglect the tool string that possibly cause.

Description of drawings

Fig. 1 is the structure sectional view of first kind of embodiment of the present invention,

Fig. 2 is the structure sectional view of second kind of embodiment of the present invention,

Fig. 3 is a user mode sketch map of the present invention.

The specific embodiment

Below in conjunction with accompanyingdrawing 1,3 first kind of embodiment of the present invention described.

A kind of safety trips out indicator, is made up of cylindrical test joint 1, sensor 2 andalarm 3, and said cylindrical test joint 1 is processed by non-magnet_conductible material; Specifically; Said non-magnet_conductible material is stainless steel or TC4 titanium alloy, and cylindrical test saves 1 one ends and be threaded with following catcher 4 upper ends, and the other end is threaded withlubricator 7 lower ends; Said sensor 2 is installed on the outer wall of cylindrical test joint 1, and sensor 2 signal output parts are connected with alarm 3.Said sensor 2 is an induction coil, and saves on 1 outer wall in cylindrical test with the clip form fix.

Operating principle: induction coil produces a magnetic field after feeding electric current during work in the pipe of cylindrical test joint 1; 8 pairs of these magnetic fields of steel wire (cable/coiled tubing) can produce different induced-currents in the pipe, change the end of judging steel wire (cable/coiled tubing) 8 in the pipe and whether rise to the cylindrical test that induction coil surveys and save 1 zone through detecting induced-current.When the induced signal of induction coil output is stablized, explain that the end of steel wire in the process of tripping out (cable/coiled tubing) 8 does not also reach the position that requires apart from well head; , the induced signal of induction coil output explains that the end of steel wire (cable/coiled tubing) 8 has arrived in the distance that requires apart from well head when changing; Just the end of steel wire (cable/coiled tubing) 8 has got into the cylindrical test that induction coil surveys and has saved 1 zone; But do not get into as yet in thelubricator 7, this moment,alarm 3 sent alarm signal to the operator, and the notifying operation personnel reduce and trip out speed and begin to observe down catcher 4; Instantly catcher 4 folding handles are accomplished opening and closing movement; Show that steel wire (cable/coiled tubing) 8 bottom tool strings are about to get in thelubricator 7, stop to trip out operation this moment, closes preventer 9 flashboards shut-in well.

The present invention has avoided because the tool string that the dark directional error of mechanical/electrical meter and operator's carelessness possibly cause is dragged initiation is pulled out in the end of come off well accident and steel wire (cable/coiled tubing) 8 by blowout prevention box 5 gas blowout accident at last catcher 10 places.

Below in conjunction with accompanyingdrawing 2,3 second kind of embodiment of the present invention described.

A kind of safety trips out indicator, is made up of cylindrical test joint 1, sensor 2 andalarm 3, and said cylindrical test joint 1 is processed by non-magnet_conductible material; Specifically; Said non-magnet_conductible material is stainless steel or TC4 titanium alloy, and cylindrical test saves 1 one ends and be threaded with following catcher 4 upper ends, and the other end is threaded withlubricator 7 lower ends; Said sensor 2 is installed on the outer wall of cylindrical test joint 1; And sensor 2 signal output parts are connected withalarm 3, and specifically, said sensor 2 is a magnetic induction switch; Said magnetic induction switch is installed in cylindrical test and saves on 1 outer wall, and the calibration position of the measured object (just steel wire 8) that in cylindrical test joint 1, passes through is equipped with weak magnet steel 6.

Operating principle: when the accurate detection of needs trips out length; Can be employed in steel wire (cable/coiled tubing) 8 calibration position weak magnet steel 6 is installed, this moment, cylindrical test joint 1 outside was highly sensitive magnetic induction switch, when the weak magnet steel 6 of steel wire (cable/coiled tubing) 8 calibration position installation saves 1 through cylindrical test; The magnetic induction switch output alarm signal;Alarm 3 is reported to the police, and can accurately survey and trip out length, and why adopting weak magnet steel is in order to prevent logger to be produced interference.

The foregoing description is preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention, so all equivalences of being done with the said content of claim of the present invention change, all should be included within the claim scope of the present invention.

Claims (4)

1. safety trips out indicator; It is characterized in that: said indicator saves (1), sensor (2) and alarm (3) by cylindrical test and constitutes; Said cylindrical test joint (1) is processed by non-magnet_conductible material, and is connected on cylindrical test joint (1) one end and the following catcher (4), and the other end is connected with lubricator (7) lower end; Said sensor (2) is installed on the outer wall of cylindrical test joint (1), and sensor (2) signal output part is connected with alarm (3).

2. safety according to claim 1 trips out indicator, it is characterized in that: said sensor (2) is an induction coil, and saves on (1) outer wall in cylindrical test with the clip form fix.

3. safety according to claim 1 trips out indicator; It is characterized in that: said sensor (2) is a magnetic induction switch; Said magnetic induction switch is installed on cylindrical test joint (1) outer wall, and the calibration position of the measured object that in cylindrical test joint (1), passes through is equipped with weak magnet steel (6).

4. trip out indicator according to claim 1,2 or 3 described safety, it is characterized in that: said non-magnet_conductible material is stainless steel or TC4 titanium alloy.

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