Method for examining horizontal wells

FIELD: geophysics.

SUBSTANCE: method includes lowering protective container to the well to portion of intensive curvature of shaft, which container is fixed at end of drilling pipes, lowering of geophysical device into protective container on lower portion of logging cable, delivery of protective container with geophysical device to pit-face by consecutive extending of drilling pipes column, lowering of upper portion of logging cable through remote-controlled compactor of logging cable fixed on branch of swivel, into drilling pipes, until electric contact to free end of lower portion of logging cable via detachable connecting sleeve, geophysical examining of shaft during raising of geophysical device together with drilling pipes with appropriate connection-disconnection of fixing ends of lower and upper portions of logging cable when screwing away each following drill stand. When examining wells having extensive steeply slanted portion of well shaft with zenith angle of 50°-90°, where lowering of upper portion of logging cable to electrical contact with free end of lower portion of logging cable via detachable connecting sleeve under its own weight is difficult due to friction at drilling column wall, forced lowering of detachable connecting sleeve is performed by feeding washing liquid under pressure into drilling pipes and concurrent adjustment of pressure in chamber of remote-controlled compactor of logging cable. Pressure in chamber of remote-controlled logging cable compactor is achieved to be close to pressure of washing liquid in drilling pipes, to provide for optimal speed of cable lowering and its pressurization, and after connection of detachable connecting sleeve to lower portion of logging cable during raising and lowering of drilling pipes, examinations of well are performed.

EFFECT: higher efficiency.

1 dwg

 

The invention relates to geophysical studies of directional and horizontal wells in the drilling process.

There is a method of study of horizontal wells (Rapin, VA, Chesnokov, VA and Bernstein, D.A. geophysical research in drilling horizontal and directional wells. The oil and gas industry. Information collection. Scientific and technical achievements and advanced experience, recommended for implementation in the petroleum industry, issue 6, 1990), which in the well to the depth at which begins the intense curvature of the shaft, fixed to the lower end of the drill pipe protective electrodiathermy container. Through the drill pipe in a protective container on wireline down the geophysical instrument. Translate using the side of the sub wireline from the internal cavity of the drill pipe in the annulus. Ramping up and down in the hole remaining portion of the drill pipe, fixing the logging cable on their outer surface. While the geophysical instrument is delivered to the borehole bottom. In the process of lifting the drill pipe produce research of the horizontal wellbore. The known method is not fully reliable, since the upper part of the hoist cable is fixed on the outer surface of the drill pipe, Thu the limits rotation of the drilling tool, and also increases the probability of cable failure due to mechanical damage in the annulus.

The known method and apparatus for logging while drilling (U.S. patent No. 3, 789, 936 dated February 5, 1974 Method and apparatus for simultaneously drilling and logging”on which the cable is introduced into the internal cavity of the drill pipe through a remotely controlled seal hoist cable attached to the outlet of the swivel. The method allows to carry out research in the drilling process. While the logging cable is inside the pipe and eliminates the possibility of injury.

However, the known method does not allow exploration of horizontal wells.

There is a method of study of horizontal wells (Bags V.M., Nesterenko MG, Ledyaev E.A. Analysis technology research wells with horizontal trunks. “Oil industry”, No. 9, 2001, pp.93-94), in which the logging cable is not put into the annulus, and descend into the well inside the flexible tube, the end of which is fixed geophysical instrument. The method allows due to the elasticity of the flexible tube to deliver safe and geophysical instrument in a horizontal wellbore, and to conduct geophysical investigations in the horizontal barrel length up to 500 m. However, for the implementation of the known method requires a special Dor is hostease equipment (Coll-Tubing), that considerably increases the cost of conducting geophysical investigations of horizontal wells.

There is a method of study of horizontal wells (RF Patent No. 2006575, E 21 In 47/00, 1993), taken as a prototype. According to a known method the logging cable is not displayed in the annulus, and is constantly inside the drill pipe string. Moreover, the logging cable consists of two segments (respectively lower and upper), joined by detachable couplings. In the well to the area of intensive curvature of the barrel down drill pipe fixed on their end of the protective container. Then, in a protective container on the lower part of the wireline down the geophysical instrument. The free end of this segment logging cable with connector couplings fixed to the upper end of the candle drill pipe and lower drill pipe, carrying the container with the geophysical instrument in a horizontal wellbore. After delivery of the protective container with a geophysical device in the bottom hole down the upper section of the hoist cable with mating connector of the coupling on the end to the electrical connection of the lower segment of the wireline. Geophysical surveys carried out during the lifting of the protective container with a geophysical instrument by members who telego detach regular candles drill pipe with the appropriate separation of the detachable connection of the coupling of the wireline.

A known method eliminates mechanical damage to the hoist cable during rotation of the drill pipe. However, its application is not possible when conducting research wells with extended steeply inclined portion of the wellbore with the Zenith angle 50°-90°where the descent of the upper segment of the logging cable to the electrical connection with the free end of the lower segment of the wireline through a detachable coupling under its own weight restricted due to the wall friction of the drill string.

The present invention is the provision of opportunities for studies of horizontal wells with long steeply inclined portion of the wellbore with the Zenith angle 50°-90°where the descent of the upper segment of the logging cable to the electrical connection with the free end of the lower segment of the wireline through a detachable coupling under its own weight restricted due to the wall friction of the drill string, while maintaining the reliability of the prototype.

The problem is solved by the fact that when you save the sequence of operations of the prototype in the study wells with extended steeply inclined portion of the wellbore with the Zenith angle 50°-90°where the descent of the upper segment of the logging cable to the electrical connection with his the one end of the lower segment of the wireline through a detachable coupling under its own weight restricted due to the wall friction of the drill string, carry out a forced descent detachable coupling by feeding washing fluid under pressure in the drill pipe and the simultaneous regulation of the pressure in the chamber remote-controlled seal wireline, while seeking to pressure in the chamber remote-controlled seal hoist cable was close to the pressure of drilling fluid in the drill pipe, thereby providing an optimum rate of descent and sealing of the hoist cable and after connecting detachable coupling with the bottom cut logging cable when lifting or lowering drill pipe conducting research well.

The proposed method has the following advantages compared with prototype:

- carry out a forced descent detachable coupling by feeding washing fluid under pressure in the drill pipe, which allows for preserving the reliability of the prototype to conduct research wells, the vertical part of the trunk which is curved and descending the upper segment of the logging cable to the electrical connection with the free end of the lower segment of the wireline through a detachable coupling under its own weight restricted due to the wall friction of the drill string;

- simultaneous regulation of the pressure in the AC the ore remotely controlled seal of the wireline at the same time achieve, to the pressure in the chamber remote-controlled seal hoist cable was close to the pressure of drilling fluid in the drill pipe, thereby providing an optimum rate of descent and sealing of the cable, which eliminates the possibility of pushing the hoist cable through the seal of the drill pipe out, its deformation and damage, and reduce the time to research wells.

For the technical realization of the proposed method study of horizontal wells do not require special materials and equipment.

The applicant is not known technical solutions containing similar features distinguishing the claimed method from the prototype. Thus, it can be concluded according to the invention, the criteria of “Novelty” and “Inventive step”.

The drawing shows a variant of the technical realization of the proposed method study of horizontal wells.

The method of study of horizontal wells is as follows. In the borehole (not shown) to a depth of intense curvature (50°) on drill pipe down the lineup drilling tool, comprising a screw engine 2 and bit 3. At the bottom of the drill pipe directly above the screw motor 2 is fixed to the protective container 4. Inside drill pipe 1 to lower the eat segment 5 of the wireline down the geophysical instrument 6 to install it in a protective container 4. Protective container 4 provided with a through opening for the circulation and shock absorbers to protect the logging tool 6 from vibration loads (slots and dampers not shown). The nipple 7 segment 5 of the hoist cable is fixed on the upper end of the drill pipe 1. Further, increasing the string of drill pipes 8, take protective container 4 with a geophysical device 6 in a horizontal wellbore, connect the leading drill pipe 9 with lowered into the well casing pipe 8. Lowered into the drill pipe to the upper section of the wireline 10, passing it first through a seal 11 is attached to the outlet 12 of the swivel. Initially the descent of the upper segment of the logging cable 10 with detachable coupler 13 is under its own weight, what is really at the Zenith angles of not more than 50-55°. At large Zenith angles under the action of the friction force logging cable stops. Next, perform a forced descent of the hoist cable 10 with the coupling 13. To do this drill pipe serves washing fluid under pressure 50-80 MPa. On the logging cable 10 is acting force of the fluid flow tending to move the cable down and the pressure tending to push the cable through the seal up. The force of the extrusion of the cable through the seal 11 up to compensate for irout feeding into the chamber of the seal 11 remotely through a pipeline (not shown) of fluid under pressure. This regulates the pressure in the chamber of the seal 11 so that it is close to the pressure of drilling fluid in the drill pipe 8. As a result, the logging cable 10 is only effective force of fluid flow tending to move the logging cable 10 down. The closer the pressure in the chamber of the seal 11 to the pressure of drilling fluid in the drill pipe 8, the greater the force that moves the cable 10 down, and consequently, the greater the rate of descent of the upper segment of the logging cable 10 with detachable coupler 13. At the same time at this pressure provides a more complete sealing enter the logging cable 10 into the internal cavity of the drill pipe 8, as in case of equality of pressure in the drill pipe 8 and into the chamber of the seal 11, the leakage of drilling fluid from the drill pipe 8 is missing. Under the force of the flow of wash liquid to the upper segment of the wireline 10 with detachable coupler 13 is moved down to the dock clutch 13 with the nipple 7. Further, when running or climbing drill pipe on one candle conduct research horizontal wellbore by registering on the surface of the information coming from the geophysical instrument 6. The investigations can be carried out in the drilling process, and when it stops. After investigating the coupling 13 disconnect types 7 and raise the leading drill pipe 9. Increasing or Unscrew the ring of the next candle and repeat the operation on the descent detachable couplings 13 and research well to the target depth.

In the proposed method provides the possibility of conducting research in a horizontal wells with long steeply inclined portion of the wellbore with the Zenith angle 50°-90°where the descent of the upper segment of the logging cable 10 with detachable coupling 13 under its own weight is impossible, i.e. expands the scope of investigations of horizontal wells. The implementation of the process will increase the reliability of the study of horizontal wells.

The method of study of horizontal wells, including the descent into the well to the area of intensive curvature of the wellbore protective container attached to the end of the drill pipe, the descent into the protective container on the lower part of the wireline logging tool, the protective shipping container with the geophysical instrument on the bottom of the borehole by means of sequential growth of the drill pipe, down through fixed on the outlet swivel remotely-controlled seal wireline inside the drill pipe to the upper segment of the logging cable to the electrical connection with the free end of the lower segment of the wireline p. the means of detachable coupling, geophysical surveys of the wellbore when lifting logging tool with drill pipes with the appropriate separation of connection spigot ends of the lower and upper segments of the logging cable by unscrewing each of the next candle, characterized in that in the study wells with extended crotonylene part of the wellbore with a Zenith angle of 50 to 90°where the descent of the upper segment of the logging cable to the electrical connection with the free end of the lower segment of the wireline through a detachable coupling under its own weight restricted due to the wall friction of the drill string, perform a forced descent detachable coupling by feeding washing fluid under pressure in drill pipe and simultaneous regulation of the pressure in the chamber remote-controlled seal wireline, while seeking to pressure in the chamber remote-controlled seal hoist cable was close to the pressure of drilling fluid in the drill pipe, thereby providing an optimum rate of descent of the cable and sealing, and after the detachable connection of the coupling with the bottom cut logging cable when lifting or lowering drill pipe conducting research well.



 

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1 ex

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EFFECT: higher precision.

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