SU920201A1 - Hole-bottom self-sufficient instrument for studying wells - Google Patents

Description

(54) BOTTOM AUTONOMOUS DEVELOPMENT FOR RESEARCH The invention tends to drill, and, in particular, concerns autonomous fences for measuring and recording error parameters. A self-contained downhole measuring and recording instrument for well logging and containing a carriage probe on the pipe, metering equipment and power supply unit is known; the first is in an airtight container that is rigidly installed in the probe tube. During operation of the device, electrical signals from the probe electrodes through the wires and sealed electrical leads. enter the measuring recording equipment Z-N. The disadvantage of this device is that the information registered in it can be obtained on the surface only after the end of the voyage of the bit and the removal of the drill string at the wellhead.

WELL A standalone device, known for measuring and recording axial load and torque on a bit, containing a measuring sub with sensors, inside which there is a measuring apparatus, a magnetic recorder and a power source, is also known. The connection between the sensors on the sub and the equipment in the case is carried out by means of drives and hermetic electric leads 2. However, a hard connection between the sensors, the measuring block and the recorder leads to the fact that the recorded information can be obtained on the day surface after the end of the bit flight and retrieving drilling tool at the wellhead, which does not allow operational control of the drilling process during the current bit flight. At the same time, as drilling practice shows, the availability of reliable bottomhole information on the magnitude of axial load and torque on the surface allows to ensure the optimal drilling mode and with a sufficient degree of accuracy to determine the time when the bit needs to be changed. This accordingly allows to improve drilling performance, to reduce the number of tripping of the drilling tool due to high quality machining of the bit and reducing the time spent on

simple well by preventing emergencies. Obtaining information about the geometrical parameters of the well during the current flight of the well allows its wiring and a given point, as well as eliminates drilling downtime caused by the descent of the inclinometer equipment on the cable. Depending on the task being solved, a given set of parameters is transmitted to the wellhead.

The aim of the invention is the implementation of the rapid transfer of measurement results of a set of parameters from the intake to the mouth of it.

The goal is achieved by the fact that the downhole autonomous device, comprising a housing with sensors, a measuring unit, a recorder and a power source, is provided with an additional recording unit with a memory element, which is placed in a sealed container that pops up in the drilling mud, and the additional recording unit is connected to the measuring beskargaktny electromagnetic coupling unit.

The contactless electromagnetic communication of the blocks is carried out by means of inductance coils arranged concentrically one relative to another and connected respectively to the memory unit and the measuring unit, while the inductive coils are fixed at the ends of the measuring unit and the additional recording unit.

On fkg, 1 is represented a bottomhole autonomous device; in fig. 2 shows a contactless electromagnetic coupling unit, A-A in FIG. one.,

Downhole stand-alone device for

The well survey consists of a housing 1 with sensors 2, in which quality resistivity meters can be used, rigidly connected to a drill string 3, a multichannel measuring unit 4, a recorder 5, a gaggani source 6 installed in a hardware chassis 7 located in housing 1, and an additional recording unit 8, inside which is located nodes 9. Each channel of the measuring unit 4 contains, for example, an amplifier connected in series, an analogue converter — a code (not shown in Fig. 1, 2 s). The additional register of the generating unit 8 is made in the form of an airtight container with a specific weight less than the specific weight of the 1-WASHING liquid, which allows it to freely float in the drilling rig inside the drill pipe string. The power source 6 is designed to supply the corresponding voltages to the autonomous digital circuitry.

The memory node 9 of the additional recording unit 8 is connected to the measuring unit 4 contactless. electromagnetic coupling, made in the form of inductive coils 1O and 11, which are located condenserly relative to each other and connected respectively to the memory node 9c of the measuring unit 4. At the same time, the disconnected coils 10 and 11 are fixed, respectively, at the ends of the equipment x and 7 8. The number of inductive coils at both ends is determined by the number of parameters to be transmitted at the wellhead.

The principle of operation of a downhole autonomous fiber (the fa for well testing consists of the following.

An autonomous hobby, embedded in the: olon. Of the drill pipe 3, is lowered to the bottom of the well through the housing I. Before screwing the drive tube (square) into the drill string, the additional recording unit 8 is dropped, which, due to its buoyancy, is located in its upper part. After installing the lead pipe and turning on the drilling pumps, the Additional Recording Unit 8 is moved to the bottom of the column by the force of the pumped solution until its lower end 12 comes into mechanical contact with the upper end 13 of the equipment 7. After switching on the stand-alone device (for example, using a clock mechanism or an electronic time relay) electrical signals from sensors 2 are fed to measuring unit 4 After amplification and coding of signals, the specified set of black parameters Without inductive coils 10 11 enters the memory node 9 of additional

and the "recorder 5." Lifting the additional recording unit 8 to the wellhead is the implementation of a drill pump, which is usually combined with a drill pipe or a change in the bit.

Upon reaching the wellhead, the block 8 is removed from the drill string and the information registered there is read out. Before the next one. during the drilling phase, an additional recording unit 8 is again placed in the internal cavity of the drill string and the cycle is repeated.

For the SYNCHRISM of memory parameter records, recorded both in the additional registering unit 8 and in the recorder 5, well-known methods can be used to record ground-based recorders rh) and, for example, an increase in the pressure drop in the discharge line at the moment when the blocks 8 and 4 in combination with a change in the electrical impedance followed by fixing this moment in the recorder 5 and others.

The annual economic effect from the use of one set of bottomhole autonomous hh) device will be about 8.0 thousand rubles.

Claims (2)

Claim 1. Borehole Autonomous For Well Testing, comprising a body with sensors, measuring unit, operating equipment in the nffraiff H, characterized in that, in order to carry out operational transfer of results and measurement of a set of parameters from the bottom of the well, it is equipped with a nononHFrrenbHbiM register) made in the form of a free-floating reservoir in a sealed drilling fluid container with a memory unit located therein, which is connected to the bench unit by a contactless electromagnetic coupling. 2. The device according to claim. Characterized in that the non-contact electromagnetic communication is made in. the form of inductive coils, located kontentrichno one relative to the other- and connected to the memory element and the measuring unit, respectively, for this inductive coils are fixed on the ends of the measuring unit in an additional recording unit, Sources of information, tfinovye into account in the examination 1. USSR author's certificate No. 215158, cl. E 21 B 47/00, 1967. V 2.Varlamov V.P. Tepekontrol of bottomhole drilling parameters. M., VNIIOENG, MNP, series OZL, 1972. with. 54. 2