SU564409A1 - Hydroabrasive drill - Google Patents

Description

one

Isofeating refers to the technique of opening the products of b1x layers in exploration and exploration wells, in particular, devices for opening through the production string in one descent into the well as several thin reservoirs spaced apart from each other by large and significant formations power with abnormally high reservoir pressure.

A hydroabrasive is known as the first perforator, consisting of a body with interchangeable nozzles, which permits the opening of one interval ij in one cycle of pumping of the abrasive fluid.

The disadvantage of this perforator is the laboriousness of lowering and lifting tubing, a considerable amount of time for backwashing after opening each interval and using equipment to pump the abrasive mixture. In addition, the body parts are washed out by a jet of abrasive mixture, which reduces the performance and reliability of pa6of. ,

The closest to the proposed ow 2

The e-gpsroabrasive perforator, which includes a drawdown body, an elastic clamp valve and a 2-valve valve. The disadvantage of this perforator is that, after performing a full cycle of operation, the valve with a sheet of each section moves to the lower position and cuts the retaining pins, which prevents re-triggering without lifting the device to the surface and reduces productivity.

The chain of the invention is to increase productivity by repeatedly triggering punch blocks in one run into a well. For this, in the proposed perforator, the shutter is made in the form of a differential freely mounted in the sleeve housing, which forms an insulated chamber with the housing wall.

The drawing shows the proposed hydrag abrasive punch, longitudinal section

Claims (2)

The hydroabrasive perforator contains KOf start 1, replaceable nozzles 2, shutter 3, disassembled as a differential sleeve that is freely installed in housing 1, elastic seals 4 and 5, and protective elastic washers 6, which prevent the seal of extrusion HXJ from the gap between sealing surfaces The inner surface of the housing 1 and the outer surface of the shutter 3 form an isolated chamber 7 between them, the upper part of the shutter 3 has a cone valve 8, and the inner surface of the housing 1 above the nozzles 2 is made in the form of a conical seat. 9. The perforator also contains a valve ball Yu in the conical seat 11 of the bolt 3, which overlaps its central channel. In the lower part of the housing | 1, a stroke limiter 12 of the shutter 3 is installed on the threaded connection. The hydraulic abrasive perforator operates as follows. Lower the perforator into the well on the drill pipe or tubing. When this happens, the pipes are filled with the flushing fluid from the well through the open nozzles 2 and the central open channel of the shutter 3. As soon as the force from the hydrostatic pressure on the lower area of the shutter 3, the pressure of the compressible air in the insulated chamber 7 increases, the friction force between body 1 , up 4 and 5 and shutter 3, the latter moves to the upper position before the valve 8 is seated on the saddle 9, the nozzle 2 overlaps the inner cavity of the perforator and the annular space; . After installing a hydroabrasive perforator at a predetermined depth, valve valve Yu is thrown from the surface and abrasive fluid is pumped. In the process of injection, an overpressure occurs over the shutter 3, the force from which moves the shutter down to the stroke limiter 12, opening the nozzles 2 through which the abrasive fluid flows rapidly. In the process of perforation, the force from the pressure drop occurring in. nozzles 2, keep the shutter 3 and the ball 10 in its lower position. After termination of the perforation force from; the pressure drop completely disappears, and the force, constantly acting from the hydrostatic pressure of the well flushing liquid column on the lower area of the gate 3, automatically moves it to its original upper position. There is a hermetic separation of the internal cavity of the perforator from the annulus. The block of hydroabrasive perforators is assembled from several perforators with different through channels in the gate, increasing in diameter from bottom to top so that during one cycle of perforations, starting from the lower perforator, without interrupting the established mode of injection of abrasive fluid, it would be possible to trigger all perforators, those. voe-, it would be possible to perform the opening of several intervals. In this case, the actuation occurs by throwing from the surface at certain intervals the valve spans Yu, which increase in diameter to the size of the cone seat 11 of each perforator of the block. When landing the valve shaft in the saddle of the perforated perforator, the automatic return of the bolt 3 below the perforator to the initial upper position and separation of the internal cavity from the annulus occurs. After the complete perforation cycle has been completed, all the perforators of the block are automatically restored to their original position, they lift the valve balls backward to the surface, lift the string of pipes and repeat the perforation cycle. The formula of the invention. A hydroabrasive perforator, comprising a housing with nozzles, a valve with elastic seals and a valve ball, characterized in that, in order to increase productivity by repeatedly activating the perforator blocks in one descent into the well, the valve is designed as a free-floating one. vtytilki case, forming an insulated chamber with the case wall. Sources of information received in-in. Sh-. mania during the examination: 1. Forc number 166912, according to which the decision was made to issue the author's witness-g; TWA, CL. E O2 B 43/114. 1963.; 2. Temporary instructions for the hydro-sand jet method of perforation and opening the paste. M., 1967, p. 21-24 ..