CN202081883U

CN202081883U - Depth encoder used for measuring well depth

Info

Publication number: CN202081883U
Application number: CN2011201544495U
Authority: CN
Inventors: 莫福贵
Original assignee: Beijing Hailan Science & Technology Development Co Ltd
Current assignee: Beijing Hailan Science & Technology Development Co Ltd
Priority date: 2011-05-16
Filing date: 2011-05-16
Publication date: 2011-12-21
Anticipated expiration: 2021-05-16

Abstract

The utility model relates to a depth encoder used for measuring well depth, which comprises a shell, a main shaft, a grating coding plate, a signal regulating circuit and a cable. The main shaft is fixed in the shell through a bearing; the grating coding plate and the signal regulating circuit are arranged outside the main shaft; an optical coupler is arranged close to the grating coding plate; the optical coupler is connected with the signal regulating circuit and provides a detection signal for the signal regulating circuit; an angle coding signal output by the signal regulating circuit is transmitted to an external device through the cable. A theory of the angle coder is also utilized, but the angle encoder can be directly connected with a winch barrel shaft; the signal transmission and the connection of the external device are more convenient and easier, so the depth encoder is an optimized sensor for a well depth tracking and measuring system.

Description

Depth encoder for measuring well depth

Technical Field

The utility model relates to a petroleum industry is with wireless instrument while drilling, concretely relates to a depth encoder for measuring well depth.

Background

In the construction process of a directional well in the petroleum drilling industry, well depth tracking is very important and difficult work. Generally, a drill rod and a drilling tool are tripped in and out by means of a steel wire rope pulley system on the drilling machine, a steel wire rope is fixedly wound on a winch drum of the drilling machine, and the winch drum and a winch drum shaft are connected together through a key and a key groove. When the winch drum rotates forwards and backwards, the steel wire rope pulley system can drive the drilling tool to move up and down. If the rotation angle of the winch drum shaft is measured, the vertical movement distance of the drilling tool can be calculated, and the well depth can be measured. The angle sensor shaft and the winch drum shaft are coaxially connected, and the rotating angle of the angle sensor shaft is completely consistent with that of the drum, so that the purpose of calculating the well depth can be realized by measuring the angle of the angle sensor.

Due to the special working environment of the oil drilling machine and the structure of the winch, corresponding requirements are required for the performance of the angle encoder and the transmission of signals, and the requirements of the working condition can not be well met no matter the common angle encoder is installed in a manner of being matched with a winch shaft or in the aspect of signal output transmission.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the demand to angle encoder among the well depth measurement, provide a depth encoder for measuring the well depth. The winch still utilizes the principle of an angle encoder, but can be directly connected with a winch drum shaft, and the signal transmission and the interface are more convenient and easier.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a depth encoder for measuring well depth, includes casing, main shaft, grating coding dish, signal conditioning circuit and cable, its the main shaft is fixed in through the bearing in the casing install the outside of main shaft the grating coding dish reaches signal conditioning circuit grating coding dish one side is equipped with the opto-coupler device, the opto-coupler device with signal conditioning circuit connects and provides the angle signal that detects for it, signal conditioning circuit converts angle signal into angle coding signal and passes through the cable transmission to external equipment.

The signal conditioning circuit has the function that a non-electric quantity signal acquired by the optical coupler through the grating coding disc is conditioned to be changed into a digital signal which can be measured, namely an angle coding signal, and then the digital signal is sent to external equipment for processing.

The cable is provided with a steel wire braided rubber tube cable sheath, and two ends of the cable are provided with steel clamps convenient to connect.

And the output end of the cable is provided with a connecting socket. The main shaft is a stainless steel shaft.

The utility model discloses during the specific use, with depth encoder fixed mounting on the winch drum axle and keep being connected with the axle center, make depth encoder's rotation angle and cylinder rotation angle completely unanimous, consequently through measurement depth encoder's angle, both can calculate the well depth according to following formula:

Figure 2011201544495100002DEST_PATH_IMAGE002

wherein,Lis the arc length, n is the angle,Ris radius

And then converting the arc length into the well depth.

The utility model has the advantages that: adopt the utility model discloses a depth encoder, it is convenient with the supporting connection of winch drum shaft, and reliable operation, but the signal passes through cable long distance safety transmission. The difficult problem of well depth measurement is solved well.

Drawings

FIG. 1 is a schematic front view of the structure of the present invention;

fig. 2 is a partial cross-sectional top view of fig. 1.

In fig. 1 and 2, 1, a housing, 2, a main shaft, 3, a grating code disc, 4, a signal conditioning circuit, 5, an optical coupler, 6, a cable, 7, a cable sheath, 8, a steel hoop, 9, a connection socket, 10 and a bearing.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, a depth encoder for measuring well depth comprises a shell 1, a main shaft 2, a grating coding disc 3, a signal conditioning circuit 4 and a cable 6, wherein the main shaft 2 is fixed in the shell 1 through a bearing 10, the grating coding disc 3 and the signal conditioning circuit 4 are installed on the outer side of the main shaft 2, an optical coupler 5 is arranged on one side of the grating coding disc 3, the optical coupler 5 is connected with the signal conditioning circuit 4 and provides a detected angle signal for the signal conditioning circuit 4, and the signal conditioning circuit 4 converts the angle signal into an angle coding signal and transmits the angle coding signal to external equipment through the cable 6.

The cable 6 is provided with a steel wire braided rubber tube cable sheath 7, and two ends of the cable 6 are provided with steel clamps 8 which are convenient to connect. The output end of the cable 6 is provided with a connection socket 9.

The utility model discloses during the application, be connected depth encoder's main shaft 2 with winch drum shaft, casing 1 then is fixed with the rig, produce the angular difference between grating code wheel and the opto-coupler device when winch drum shaft is rotatory, the opto-coupler device can experience the slight change of winch, angular resolution is 7.5, it is more accurate to make data, data pass through cable 6 and convey outside signal processing equipment, this example depth encoder cable 6 can be through connecting socket 9 re-extension up to 30 meters, more conveniently with the oil well with line concentration controller be connected.

Claims

1. The utility model provides a depth encoder for measuring well depth, includes casing (1), main shaft (2), grating code dish (3), signal conditioning circuit (4) and cable (6), its characterized in that: main shaft (2) are fixed in through bearing (10) in casing (1) install the outside of main shaft (2) grating code dish (3) reach signal conditioning circuit (4) are equipped with opto-coupler device (5) in grating code dish (3) one side, opto-coupler device (5) with signal conditioning circuit (4) are connected and provide the angle signal that detects for it, signal conditioning circuit (4) convert angle signal into angle code signal and pass through cable (6) transmit external equipment.

2. A depth encoder for measuring well depth as defined in claim 1, wherein: the cable (6) is provided with a steel wire braided rubber tube cable sheath (7), and two ends of the cable (6) are provided with steel clamps (8) convenient for connection.

3. A depth encoder for measuring well depth as defined in claim 1 or 2, wherein: and the output end of the cable (6) is provided with a connecting socket (9).

4. A depth encoder for measuring well depth as defined in claim 1 or 2, wherein: the main shaft (2) is a stainless steel shaft.