SU37016A1 - Instrument for measuring borehole curvature - Google Patents

Description

The currently used curvature measurement tools do not satisfy the basic accuracy requirement imposed on them.

All of these devices give only one measurement each time they are lowered into the well, and the measurements obtained by repeated descending to the same depth are significantly different from the previous ones, which completely prevent the possibility of proper orientation.

The proposed device for measuring the curvature of wells is different in that each time it is lowered into the well, it gives several readings for each measured point (depending on the number of instrument points) that are mutually controlled and, therefore, give a greater degree to the inventor’s opinion. accuracy.

In the schematic diagram of the skig drawing of FIG. 1 shows a longitudinal section of the device; FIG. 2-cross-section of the device.

The proposed device consists of a metal pipe-case of the apparatus 7, in which the second pipe 2 is enclosed. A gap is protected between the case and the internal pipe. Inside the pipe 2 there are several Rus (in the attached drawing, three), in each of which 21)

The plates are mounted on a special lead (or of other suitable material) plate 3 with concentric circles on it. In addition, in each tusk there is a heavy plumb line 4 with an attached base and a point facing the plate. The axis of the plumb line is the Hook 5 hinge, which allows it to maintain a steady position at all times.

Hooke's hinge is reinforced by B rods passing through openings 13 in the inner tube. Hooke plummets and hinges are made of non-absorbing material.

The upper part of the apparatus is closed by a cover 6, through which the rod 5 passes, rigidly connected to the inner tube. The lower part of the stem passes through the gland 9. The middle part of the stem has ledges / (pressed to the side by springs. When lowering the stem below the edges //, the ledges jam the stem and prevent its return movement.

Between the edges // and the apparatus lid on the body of the rod 8, a powerful spring 72 is reinforced, which prevents arbitrary pressing of the rod. The lower part of the inner tube 2 enters the guide grooves 7, which maintains its stability inside the apparatus casing. The entire device, in order to avoid vibrating reels, is filled with oil. At the bottom of the apparatus there is a check valve 14 for discharging oil at a pressure drop at the time of the lowering of the stem. The action of the device is as follows. The apparatus is lowered into the well on drill pipes, to which is attached with a lock and a sub. In the sub, the apparatus is clamped in the ribs between which the solution freely circulates (to the bit). The measurement is made before the beginning of the slotting, and the lifting of the apparatus is carried out at the end of the slotting when lifting the tool. The measurement technique is as follows. By supplying a solution of iodine with a certain pressure, the pins 8 and the inner tube 2 are lowered until the plates 3 touch the edges of the plumb lines 4. Since the plumb lines 4 are fixed on the hinges of the Gun 5, they give an open / low angle to which it is curved well. On the surface of each ploidad 5, the point of contact of the plumb line 4 is imprinted. Since all the pads 3 are located in one cylinder 2, several curvature measurements for one point (depending on the number of points) are obtained simultaneously, which allows to establish the true curvature index with sufficient accuracy .I All measurements are obtained by mutual control .I The subject invention. | A device for measuring the curvature of drilling wells according to the author's certificate .NO 3022, characterized by the use of three (or more) pads 3, fastened to the inner cylinder 2 at-; b with d c ts ot to ry ot ¬ ry in the outer neepoy / on Hooke’s hinges, b windows / 5 of the inner part i 4 4 ц {, -j) g gul zqll;