SU1489355A1 - Arrangement for downhole penetration and sampling - Google Patents

Description

The device relates to technical means for studying the properties of Soils in the conditions of their natural occurrence by the method of static sounding and sampling in wells cased by pipes, and is intended for geological engineering surveys on land, as well as during the construction of offshore hydraulic structures.

The purpose of the invention is to increase the productivity of the study ^{: the} properties of soils in their natural occurrence by the method of static sounding and sampling in the well due to an increase in the traveling depth of sounding.

In FIG. 1 shows a device for downhole penetration and sampling; in FIG. 2 - section aa in figure 1.

The device includes an anchor mechanism 1, a fluid supply system 2, a probe or sampler 3 with penetration rods 4, a hydrophysical cylinder 10 s. a piston 6 made with a central internal cavity in which a clamp is placed in the form of dies 7 with a spring washer 8, hollow coaxial rods 9 and 10, with the upper 15th rod 9 fixed to the piston and the lower rod 10 fixed to its upper the end stop 11 is made with the possibility of movement relative to the piston 6. The dies 7 zazhim-20 ma mounted on conical wedges 12, rigidly fixed in the internal cavity of the piston 6, and can move in the axial direction. On the bottom ’cover of the hydraulic cylinder 5 is fixed. 25 sator 13 With the possibility of its interaction with the rod 10 in its lower part. A cable system 14 of the lifting mechanism is connected to the device, by means of which the device 30 is lowered to the bottom in casing pipes 15.

The device operates as follows.

A device with a probe installed in it (sampler 3), connected to penetration rods 4, is lowered on the cable system 14. On the bottom of the well and fixed with an anchor mechanism 1 to the casing 15. When supplying the working fluid through the system .40 mu 2 in the over-piston cavity of the hydraulic cylinder 5, the piston 6 moves downward relative to the lower rod 10, holding. fixed in the fixed position by the latch 13. In this case, the dies of the clamp 7, 45 sliding along the conical wedges 12, under the action of the stop 11 move radially and capture the penetration rod 4. With a further increase in the pressure of the working fluid in the over-piston cavity of the hydraulic cylinder 5, the piston 6 with penetration rods 4, transmitting the force through the stop 11 to the lower rod 10, depresses the latch 13 and presses the probe (sampler 3) into the ground. In this case, the working fluid from the piston 'cavity of the hydraulic cylinder 5 enters the drain through the system 2.

When the piston 6 reaches its extreme lower position, the pressure of the working fluid through the inlet system 2 is supplied to the under-piston cavity of the hydraulic cylinder 5, and from the over-piston cavity, the fluid flows to the drain. When this piston 6 begins to move up, its conical wedges 12, moving along the grooves of the dies of the clamp 7, select the gap between the lower end of the stop 1 1 and the upper end of the lower cover of the piston 6. In this case, the dies 7 are unclenched by a spring washer 8, move in the radial direction, releasing penetration rod 4 from capture. After that, the piston 6 is moved to its highest position.

When the piston 6 reaches its highest position, the cycle repeats and there is a further indentation of the probe or sampler into the ground. The number of cycles of piston movement in the hydraulic cylinder is repeated until the total resistance to indentation of the probe or sampler along the frontal and lateral surfaces reaches a predetermined value.

Removing the device is carried out by the cable of the lifting mechanism after the unscannering of the mechanism 1 in the · 'position of the capture of the penetration rod dies 7.

The device compared to the prototype allows by reducing the driving penetration to reduce operating costs for soil research along the well section. In addition, the device allows for static sounding of the soil without the use of heavy ballast frames due to the use of an anchor device that transmits the soil reaction to the walls of the casing. This makes it possible to abandon the whole complex of heavy and bulky auxiliary. Nogo technological equipment.

Claims (4)

Claim 1. A device for downhole penetration and sampling, including an anchor mechanism, a hydraulic cylinder with covers and a piston, a probe or sampler and a system for supplying working fluid to the hydraulic cylinder, characterized in that, in order to increase the productivity of work when studying the properties of soils in their natural occurrence due to an increase in the traveling depth of sounding, it is equipped with a penetradion rod associated with the probe or sampler, the piston of the hydraulic cylinder is equipped with a clamp made in the form of dies installed with the possibility of sowing and radial movement in the central internal cavity of the piston, and hollow coaxial rods placed in the central through-hole sealed holes of the upper and lower covers of the hydraulic cylinder, the upper rod being fixed motionless relative to the piston, and the lower rod provided with a stop mounted on its upper end, while the length of the rods is not less than the maximum piston stroke in the cavity of the hydraulic cylinder. 2. The device according to claim 1, which requires that, in order to increase the reliability of the radial displacement of the clamp during operation, the piston is equipped with 25 guide cone wedges rigidly mounted in the internal cavity of the piston, the clamp dies are made with vertical grooves and are connected with guide cone wedges made of the same configuration, the upper end of the lower piston cover being made with a clearance of a stop fixed to the lower rod. 3. The device according to paragraphs. 1 and 2, characterized in that, in order to increase the reliability of clamping with dies of a penetradion rod, the hydraulic cylinder is equipped with an adjustable piston lock relative to the lower rod. 4. The device according to paragraphs. 1,2 and 3, about t- 20 'characterized in that, in order to improve the reliability of the output of the clamp dies out of contact with the penetration rod, the clamp is equipped with a split spring washer installed in the grooves of the dies. Aa FIG. 2 Phi {. 1