RU2247238C1 - Device for delivering equipment to steeply slanted well - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pusher in form of stringed onto logging cable and fixed there cylindrical elements, providing rigidity to cable and load, fixed at cable above the pusher and generating necessary force for pushing equipment along steeply slanted shaft, where lowering of equipment on cable under their weight is difficult due to friction against well wall. Device has additional lower load fixed at cable below the pusher, and pusher is made with length for not less than 20-25% greater than length of the longest steeply slanted well portion, where lowering of equipment on cable under their weight is difficult due to friction against well wall.

EFFECT: higher efficiency.

1 dwg

Description

The invention relates to the field of drilling and operation of oil wells, in particular to field geophysical studies of steeply deviated wells.

A device is known for the delivery of geophysical instruments (hereinafter referred to as instruments) into a horizontal well (US patent No. 4082144 IPC E 21 B 47/00, publ. 04.04.78), which is a load strung on a wireline above the tool. The load is made in the form of tubular nozzles connected in series with each other using a detachable locking device so that they are freely put on the wireline cable and together with the device descend into the open wellbore to a predetermined depth. Due to the rigidity attached to the cable, the device moves freely in the horizontal and curved parts of the well. The advantage of the device is that it has a small diameter and allows research in small diameter wells. The disadvantage of this device is that it is required to collect from the nozzles a long cargo from the wellhead to the bottom of the well, which requires a lot of time and labor.

A known method and device for the delivery of instruments to a horizontal well (RF patent No. 2148167, publ. 04/27/2000), comprising a device that is lowered into the well on a wireline cable. Above the instrument, a pusher and a load are fixed on the logging cable, which are made of pipes strung onto the cable and interconnected. In this case, the pusher is made of light pipes, and the load of heavy pipes. Pusher and weight pipes are fixed on the cable motionless with the help of special clamps. The delivery of devices to a horizontal well using a known device is carried out in the following sequence. The device is lowered into the well on the cable so that the upper part of the device is on the surface. String on the cable and fix the lower pusher pipe on the upper end of the device. The cable is lowered to the length of the lower pusher tube. String on the cable and connect the next pusher pipe to the lower pipe. Repeating these operations, string all the pusher and load pipes onto the cable. At the same time, all pipes are fixed to the cable motionless with the help of special clamps, ensuring the cable tension between adjacent clamps, not exceeding the weight of the cable segment enclosed between these adjacent clamps. Next, the complete assembly is lowered into the well. In the horizontal well, the device moves under the action of the force developed by the load moving along the vertical or curved part of the well. However, in steeply inclined wells having long, steeply inclined sections of the wellbore, where the descent of a geophysical instrument on a cable under its weight is difficult due to friction against the wall of the well, the known device does not deliver the device to the bottom of the well, because under the action of friction on a steeply inclined section, the load stops, and with it the pusher with the device.

The objective of the invention is to ensure the delivery of the device to the bottom of steeply inclined wells having extended steeply inclined sections of the barrel, where the descent of the device on the cable under its weight is difficult due to friction against the wall of the well.

The problem is solved in that the device contains an additional lower load fixed to the cable below the pusher, and the pusher is made at least 20-25% longer than the length of the longest steeply inclined section of the well, where the descent of the device on the cable under its weight is difficult from due to friction against the wall of the well.

A comparative analysis of the proposed method with the prototype showed that the inventive device differs from the known following features:

- the device contains an additional lower load, mounted on a cable below the pusher;

- the pusher is made with a length not less than 20-25% longer than the length of the longest steeply inclined section of the well, where the descent of the device on the cable under its own weight is difficult due to friction against the wall of the well.

Due to the fact that the device contains an additional lower load fixed on the cable below the pusher, an additional pulling force is created, under which the upper load is lowered together with the pusher and the device on a steeply inclined section of the well, where it is difficult to lower the device on the cable under its weight due to friction against the wall of the well.

The implementation of the pusher is not less than 20-25% longer than the length of the longest steeply inclined section of the well, where the descent of the device on the cable under its own weight is difficult due to friction against the wall of the well, ensures the descent of the device in all steeply inclined sections and reaching the bottom .

Thus, the proposed device for the delivery of geophysical instruments to a steeply deviated well is reliable in implementation, does not require large expenses, special and expensive technologies. In total, the simplicity and reliability of the claimed device allows for geophysical studies of steeply deviated wells on a wireline without using drill pipes, which significantly reduces labor costs and increases the productivity of geophysical work.

Based on the foregoing, we can conclude that the proposed device meets the criteria of the invention of “Novelty”.

The applicant is not aware of technical solutions containing similar features that distinguish the claimed invention from the prototype, which allows us to conclude that its criterion is “Inventive step”.

The proposed device is shown in the drawing. It contains the device 1, lowered into the well on the logging cable 2 above the device 1, the lower load 3, the pusher 4 and the upper load 5 are fixed on the cable 2. The lower load 3 is made of weighted cylindrical elements that are strung on the cable 2 and fixedly mounted on it using special clamps. Using the lower load 3, additional traction is created, under which the descent occurs on steeply inclined sections of the well, where the descent of the device on the cable under its weight is difficult due to friction against the wall of the well (depth interval A-B). Above the load 3, a pusher 4 is fixed on the cable 2, made of lightweight cylindrical elements that are strung on the cable 2 and fixedly fixed on it using special clamps. The pusher 4 is made with a length not less than 20-25% longer than the length of the longest steeply inclined section of the well, where the descent of the device on the cable under its weight is difficult due to friction against the wall of the well (in the drawing it corresponds to the depth interval AB). Above the pusher 4, the upper load 5 is fixed on the cable 2, under the influence of the weight of which the force necessary to push the device 1 with the lower load 3 develops on a steeply inclined section of well AB.

The delivery of devices using the proposed device to the bottom of a steeply deviated well is carried out in the following sequence. The device 1 is lowered into the well on cable 2. The lower load 3, the pusher 4, the upper load 5 are strung and fixed on the cable 2. The device 1 on the cable 2 complete with the lower load 3, the pusher 4 and the upper load 5 is lowered into the well. Upon reaching a steeply inclined section of well AB, where the descent of device 1 on cable 2 is difficult due to friction against the wall of the well, device 1 with the lower load 3 does not stop, but continues to move toward the bottom of the well, because the force developed by the weight of the upper load 5 and transmitted by the pusher 4 to the lower load 3 and the device 1 exceeds the friction force of the latter against the well wall. Thus, the device 1 with the lower load 3 is pushed by the indicated force through the steeply inclined section of the well AB. Due to the fact that the length of the pusher exceeds the length of the steeply inclined section AB, the device 1 with the lower load 3 extends beyond section AB and enters the well section with a smaller zenith angle, where it is run on the cable under its own weight. Under the influence of the weight of the lower load 3, a traction force develops, which, through the cable 2 and the pusher 4, acts on the upper load 5, moving it in the area AB to the bottom of the well. Next, the upper load 5 goes beyond section AB and begins to move under its own weight, developing the force necessary to push the device 1 with the lower load 3 through the next steeply inclined section of the well. Thus, overcoming with the help of the proposed device steeply inclined sections, the device 1 reaches the bottom of the well.

The implementation of the proposed device will improve productivity and reduce the cost of field-geophysical work, because does not require the launching of devices on drill pipes.

Claims (1)

A device for delivering geophysical instruments to a steeply inclined well containing a pusher in the form of cylindrical elements strung and fastened to the wireline cable, adding rigidity to the cable, and a load mounted on the cable above the pusher and developing the necessary force to push the instruments along the steeply inclined shaft, where the devices are lowered on the cable under its weight it is difficult due to friction against the wall of the well, characterized in that the device contains an additional lower load fixed on the cable below the pusher, and the sense The atelier is made with a length not less than 20–25% greater than the length of the longest steeply inclined section of the well, where the descent of devices under their own weight is difficult due to friction against the well wall.