Non-contact downhole drilling temperature measurement device

FIELD: mining.

SUBSTANCE: invention refers to the mining industry, namely to the drilling equipment, and is designed for research of optimal drilling mode parameters based on the temperature rise criteria in the contact zone of the drilling tool and the rock. The device includes the core holder with a rock sample as the core installed at the spindle of the core drill, the thermal frictional tool, the optic cable laid along the gallery hole of the tool frame with its end at the friction tool end plane, connected in series with the receiver-amplifier and the registering device, the core tube with a nozzle for water input, the anti-spatter protection cover, and the water collector with water drain. There is a gallery hole connecting the internal and the external cavities of the tool in the thermal friction tool frame. This allows to cool the optic cable with water coming to the core tube, which reduces the additional IR-radiation being a hindrance to the main signal.

EFFECT: setting the optimal drilling mode parameters by the contact zone temperature of the tool and the rock, as measured on the testing bench.

2 cl, 2 dwg

 

The invention relates to mining, namely the drilling techniques used in drilling wells for various purposes, and is intended for investigation of optimal parameters of drilling on the criterion of the heating zone of contact of the tool with the bottom of a well.

A device for measuring the temperature of the grinding, containing the grinding wheel with channels made it at an angle to the generatrix of the circle, and the receiver of the infrared radiation located on the continuation of the axes of the channels [1]. During the rotation of the grinding wheel, when the axis of the channel coincides with the optical axis of the receiver, the infrared radiation of the heated zone of cutting to get to the receiver of infrared radiation, where it is converted into an analog electrical signal and fed him on the recording device.

A disadvantage of the known device is the insecurity of the system from interference. The receiver of the infrared radiation due to the rotation of the grinding wheel as interference registers extraneous infrared radiation, which reduces the reliability of measurement and limits the scope of its application.

The closest analogue of the proposed device is a device for measuring the temperature of blasting which comprises a receiver of infrared radiation directed at the area of contact of the abrasive tool with the item, an independent source of feed is, power-correlator, the modulator and transmitting antenna [2]. The device is also provided with series-connected receiving antenna, a receiver, a demodulator and a filter to produce a useful signal component, and the infrared radiation is connected to the input of the amplifier-Converter, the output of the filter through an analog-to-digital Converter connected to the device registration. Feature of the device is that the receiver of infrared radiation, an Autonomous power supply, power-correlator, a modulator and a transmitting antenna mounted in the longitudinal shaft of the abrasive tool.

The advantage of this device is that it provides increased reliability by eliminating the source of the interference and the expansion of the field of measurement. However, a disadvantage of the known device is the need for a large number of different devices. It is also very difficult to use this device for measuring the temperature of contact in rock cutting tool with the breed when drilling in cramped conditions doughnut hole.

The objective of the invention is a contactless temperature measurement contact rock cutting tool from the borehole bottom to study the fracture process and establish the optimal parameters of the drilling mode. This task R which agrees on the basis of the provisions that the temperature of the zone of contact between two rubbing bodies does not depend on which of them is rotated, and which still.

This is achieved by the proposed device for non-contact method of measuring the temperature of the contact zone thermoprinting tool with the breed, including a light guide for transmitting infrared radiation from the zone of contact of the tool with the breed, receiver amplifier for receiving infrared radiation, converting it into an electrical analog signal and the gain device registration with analog-to-digital Converter. In addition, the device includes: mounted on the shaft of the drilling machine kindergaten with rock specimen in the form of core, termofikatsionnya tool, the fiber is placed in the longitudinal channel of the instrument with the output end face of the friction element of the tool, core pipe with a pipe for supplying water, the containment spray and sump with drain water.

In the proposed device, in contrast to the analogues tool set still, and breed (detail) - rotatably, in addition, the device contains kindergaten with a threaded shank for connection with the lead pipe of the drilling machine and the light guide is placed in the longitudinal channel of the tool body, wherein the longitudinal channel is made, communicating with the inner and outer cavities of the tool. When this PR the downhole portion of the channel with the optical fiber is sealed, that water had not got to the bottom. Under these circumstances, the cold water coming into the core tube and the inner cavity of the crown, washes the fiber and does not allow it to heat up more than 90-100°C. Therefore, the walls of the light guide does not provide additional infrared radiation, which interfere with the main signal, especially when measuring temperatures of the order of 200-300°C. Above differs from analogues suggests that our proposal has novelty and inventive level.

The proposed device for contactless measurement of the temperature of the bottom hole has the following advantages:

- provides the ability to measure temperature with high accuracy without transmitting devices;

- possible temperature measurement in inaccessible to known similar devices places, and the receiving device may be located at a convenient place at the required distance of 5-10 meters

The essence of the proposed device illustrated by the drawings as applied to drilling thermofriction tool and with its cooling and removal of the drilling fines of water. Figure 1 shows a device for contactless temperature measurement method proposed, including the mount rock specimen on the drive shaft of the drilling machine, the node is stationary installation tool, feed and withdrawal of the wash fluid is STI; figure 2 - termofikatsionnya tool with fiber.

The device consists of two nodes. The first node installed at the leading tube 1 drilling machine, comprises: a rock specimen 2 in the form of a core, the outer race 3 and a shank 4 and mounting bolts 5 for centering the core axis of the shaft.

The second node includes: termofikatsionnya tool 6, the light guide 7, mounted in the longitudinal channel with an exit end face of the friction element of the tool, water pipe 8, core pipe 9 pipe 10 for supplying water, the protective cover 11 against splashing water and the sump 12 from discharge of water 13. The sump and coring tube is fastened to the frame 14, Fig 1. Tool 6 has a friction element 15, the cutters 16, a longitudinal groove 17 which communicates with the inner and outer cavities, crowns, figure 2. The light guide 7 has a sealer 18, which protects the end face of the light guide and slaughter against the ingress of water. When sealing fiber landing on its outside diameter the largest diameter of the longitudinal channel more, and the lowest is equal to the outer diameter of the fiber.

Device for measuring the temperature of the face for the end of the friction element crown works as follows.

Before starting work on the measurement of the temperature of the mounted device dimensions in accordance with figure 1 and in the longitudinal channel of the crown that goes on the end of the fries is operating element, set the light guide and seal it from water on the bottom. The fiber is successively connected with the electronic unit, the analog-digital Converter and a computer.

In the process of drilling the axial force and rotation from the leading tube 1 of the machine is transmitted to the rock specimen 2, cemented in the holder 3 with the shank 4. The rock specimen is centered in the holder mounting bolts 5 and partially kept them from turning. Tool 6 with the optical fiber 7 is connected with the core pipe 9. Water for cooling the tool gets the shaft from the pump of the machine through the pipe 10 and the core tube. Then the water coming out through the flushing channel of the instrument and reflected from the face, thrown by centrifugal force to the walls of the cage specimen of the breed. The casing 11, which serves to direct the flow of water down and protected against splash water, is installed on the water tank 12, from which the water over the Weir 13 is given out. Part of the cold water from the internal cavity of the crown through the side hole falls into the longitudinal channel in the tool body and washes the fiber, cooling it.

Under the action of axial force and rotation speed of the sample species in the zone of contact of the friction element with the breed develops temperature until the slight melting of rocks depending on the setting drilling. While the germanium / the ACLs radiation of the heated zone of the borehole bottom is transmitted through the light electronic module, representing the Converter infrared radiation into an equivalent electrical signal and an amplifier this signal, then amplified electric signal is applied to the recording device.

As a concrete example, consider the operation of the device for contactless temperature measurement under the end thermoprinting tool in experimental drilling machine SKB-4. The tool works as follows. When it is rotating under the action of axial forces cutters embedded in the rock at a depth of t, is equal to the magnitude of the timing of the friction elements, and remove the layer of rock thickness, the value of this timing t. When the friction elements are in contact with the rock and begin friction to heat the bottom. The main feature of the crown in the initial drilling period is stepped nature of its uglubki. As is known, conventional carbide tools all the cutters during drilling describe the trajectory in the form of a smooth spiral line. In our case, the tool sits on extended around the circumference of the friction elements and rotates without uglubki, removing chips as a plane. However, this forms a ledge that is longer as the rotation of the tool is reduced, due to this incident part of the friction elements hangs over the bottom, and the specific pressure on the ledge all led is ensured. And finally, when the pressure on the ledge will exceed its strength, the last razdavitsa, and the cutter again worsened by the value of its output above the plane of the end face of the tool. Thus, in the initial period of drilling constantly to face contact only down side face of the friction elements that cause rapid wear. More than this wear, the lower and shorter ledge. Because of this, if drill breed abrasive, friction elements are adapting to the bottom and enter into contact with the bottom, following the slant path of the cutters. The calculations show that the trajectory slope angle cutters at speeds up to 10 m/h is about α≈16', suggesting that full contact along the length of the friction elements is relatively quick to set up, due to the elastic properties of the rock and rapid wear down parts of the friction elements.

From the kinematics of the tool and load balancing can be seen that the temperature of the incoming and running parts of the friction element of the tool, with the optimum temperature should be installed on the down part of the friction elements. In this regard, a through channel with a diameter of 3 mm is carried out through the cascading part of the friction element. For water supply, cooling the fiber channel above matrix russiae the Xia to 4-4,5 mm The fiber is a quartz optical fiber in a protective cable and passes through the optical connection infrared transmitter infrared radiation into an electrical signal type Di-Pol-Opto-1200", combined with an amplifier of electric current. The amplified signal of the temperature value is converted to digital form in analog-to-digital Converter of the type L-791. The final signal processing is a personal computer with appropriate software.

Sources of information

1. As the USSR №1222517, CL VV 49/00. Device for measuring temperature grinding. //Vmmdev. - Publ. in BI No. 13,1986.

2. A.S. Russia No. 2151687. Device for measuring temperature of blasting. //Usseau, Weaponised, Ayinako, GPIO, Aviodance. - Publ. in BIPM No. 18 (II h), 2000.

1. Device for contactless temperature measurement of contact rock cutting tool from the borehole bottom, including the receiver amplifier infrared radiation and device registration, characterized in that it is provided with a fiber-optic light guide, a sequence of connected with receiver-amplifier and device registration and placed in the longitudinal channel of the tool with access to the contact area of the friction element crowns with the breed, when this tool is installed motionless, and abrazarte with the possibility of rotation.

2. The device according to claim 1, characterized in that the tool body cylindrical channel made communicating with the inner and outer cavities of the instrument, while the zone of distribution of the infrared radiation is sealed from the cavity of the channel with water.



 

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