SU1209857A2 - Apparatus for hydraulic fracturing of wells - Google Patents

Description

The invention relates to mining, in particular, to the design of devices that serve to determine the stress state of rocks in an array by the method of hydraulic fracturing of wells.

The purpose of the invention is to expand the measurement range by compensating for the pressure of the working fluid column and improving operational reliability.

1 shows a spool device; figure 2 - installation of the spool on the device.

The spool (figure 1) consists of body 1, cover 2, piston 3, clamps 4, spring 5 with an elastic force higher than the maximum pressure of the working fluid column. The spool body has a groove 6 and two openings 7 and 8 for the output of the working fluid. The inlet 9 is provided in the cover 9. The piston 3 is provided with channels 10 and 11, with two distribution channels 12 and 13.

The spool is installed (Fig. 2) on the inlet channel 14 of the device, which consists of packers 15 connected by pipe 16. The packers 15 have elastic shells 17. The device is connected to a high pressure source by means of a pipe 18.

When the pressure in the pipeline 18 is lower than the elastic force of the spring 5, i.e. before the high pressure source is activated, the piston 3 is in the position shown in FIG. Channel 12 and groove 6 are separated, therefore, device-isolated from pipeline 18.

0

The fracturing device works as follows.

With increasing pressure in the pipe 18, the working fluid through the inlet 9 in the lid 2 enters the housing 1, presses on the piston 3, which, mixing downward, compresses the spring 5. The distribution channel 12 and the groove 6 are connected, once. the channel 13 and the opening 7 are broken up. Thus, the device and the hydraulic system are isolated from the external environment. Working Liquid through the channel 10, the inlet 9, the distribution channel 12, the groove 6 and the hole 8 enters the input channel 14 of the device. The elastic shells 17 of the packers 15 begin to expand, isolating the fracture cavity. Then the liquid enters the interpacker space, and the pressure in it rises until the well is broken. At the end of the measurements, the pressure in the hydraulic system is released. As the fluid in pipeline 18 now presses against nopnienb 3, it begins to move upward to its original position. The distribution channel 12 and the groove 6 are separated, and the distribution channel 13 and the hole C1 7 are combined. A certain amount of working fluid, equal in volume to the fluid under the expanded elastic shells 17, is squeezed out by them through the opening 8, the channel I, the distribution channel 13 and the opening 7 to the external medium, i.e., the elastic shells 17 return to the original position.

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Compiled by N. Rudenko

Editor S. PatrushevTehred I. VeresKorrektor L. Pilipenko

Order 415/41 Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, 4/5, Raushsk nab.

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR HYDRAULIC WELL RIGGING by ed. St. No. 877006, characterized in that, in order to expand the measurement range by compensating for the pressure of the working fluid column and increase reliability in operation, it is equipped with an elastic shell protection unit mounted on the inlet channel and made in the form of a spool with a piston and spring with an elastic force greater maximum pressure of the working fluid column and installed with the possibility of interaction with the piston, while the valve body has two openings, one of which is connected to the inlet channel, and the other to the external environment. > FIG. 1