SU1559127A1 - Method of treating hole-bottom zone of well - Google Patents

Abstract

The invention relates to the oil industry. The goal is to increase the processing efficiency. To do this, before isolating the water saturated interval on the tubing before the water saturated interval, lower the reaction tip with a hole in the bottom end and pump cement mortar through it. Before thermochemical effects on the oil-saturated interval in the latter set the tip with a hole, which overlap in the lower end and load it with magnesium. At the same time, acid is pumped through the tip and through the annular space. When using this method, there is no need for a strict mode of pumping acid through the tip, which allows you to adjust the flow depending on the injectivity of the reservoir. 4 il.

Description

The invention relates to the oil and gas industry, and specifically to a method for treating a productive formation of production and injection wells.

The aim of the invention is to increase the efficiency of the treatment process.

Fig. 1 is a diagram of the installation of the reaction tip in the well and the conduction of isolation; in FIG. 2, node I in FIG. one; in fig. 3 shows the operation of lifting tubing, followed by leaching of excess cement; Fig. 4 is a thermochemical treatment operation for a productive formation;

FIG. 1-4 are the aquifer interval of formation 1, pumping and compressor pipes 2, reaction tip 3, packer 4, perforation holes 5 of the reactor, magnesium plugs 6, slit holes 7, funnel 8, rubber plugs 9, check valve 10, casing string 11, perforations 12, cement mortar 33, a ball 14, a saddle 15 with a hole 16 in the bottom end.

The method is carried out as follows.

Perforated reaction tip 3 with packer 4 (FIG. 1) is lowered into the perforated part of the aquifer 1 at the pump-compressor pipes 2 (tubing), and the perforations 5 of the reaction tip 3 are blocked off in advance by tightly magnesium plugs 6 that have slots holes 7

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(Fig. 2), The lower part of the reactor is supplied with a funnel 8 with rubber stopper 9 mounted into it. The tubing space of the NTK is filled with liquid during the reactor descent through the check valve 10 mounted on the funnel Ilocrffe descent to the tubing of the reaction tip 3 in the ICT column 2 create fluid pressure that acts on the rubber plug 9, under the action of which it moves downwards and sits in the casing 1. The rubber plug 9 serves to prevent the cement slurry from slipping into the well of the well in the process. its solidification. After that, the perforations 12 of the productive formation are separated from the aquifer 1 by the packer 4. Cement solution supplied from the well to the tubing 2 passes freely through the reaction tip 3 and the funnel 3 and enters the aquifer 1. To create a water insulating screen It is possible to pump a polymer solution, for example, Hypan, before a cement mortar. Next, the tubing 2 is raised together with the packer 4, the backwash-pump from the well is flushed out of the excess cement mortar 13 and the well is left to wait for the cement slurry to solidify. After RFQ, a 27% solution of inhibited hydrochloric acid in a volume of 0.3-0.4 m3 is pumped into the well through the tubing, after which it is pumped with water and the acid is left in the zone of reaction tip 3 for 40-50 min for removal of magnesium plugs 6 (fig. 3 n 4). Then the ball 14 is dropped, which sits in the saddle 15 of the reaction tip 3, blocking the central hole 16, thereby preventing the granulated magnesium from falling to the bottom. 1/3 of the calculated volume of hydrochloric acid is pumped into the tubing, then a buffer liquid (water) in a volume of 0.2-0.3 m3 (to prevent granulated magnesium from contacting the acid), the calculated amount of granulated magnesium is supplied through the tubing (Fig. 4) and pushing the remaining amount (second portion). When the second portion of the acid solution reaches the reaction tip 3, the acid is simultaneously pumped through the cage space. Due to the sick amount of heat released in

the reactor when connecting the acidic solution with magnesium, a solution with a residual low concentration, the passage through the slots of the reactor vessel, goes into the annulus, where it is mixed with an acid that has a 27% concentration pumped through the interstitial space. Thus, it is possible to push a hot solution of sufficiently high acid activity (according to HC1 content) into the wellbore. Moreover, the insoluble reaction products remain in the inner cavity of the reactor due to the slit holes 7. After holding for 1-2 hours, necessary for the acidic solution to react. with the rocks of the reservoir, the well is mastered.

Example. A well with a diameter of 0.146 m exploits the reservoir in the range of 1214-1224 m. During the operation, the well was flooded with up to 99% of the bottom water. After conducting preliminary work on the well, as well as removing the downhole pumping equipment, the aquifer is perforated in the aquifer zone in the 1223-11232 m interval. Perforated reaction tip 3 with the packer 4 is lowered into the perforated portion of aquifer 1 1240 m. Then, in the tubing string 2, a fluid pressure of 3-4 Ida is created, under the action of which the rubber stopper 9 moves downward, sits in the casing 11 and, due to the action of elastic forces, contracts in length and presses against the wall m wells (Fig. 1 and 3). This eliminates the need for washing the sand to fill the sump. Next, having disassembled the perforations 12 of the productive formation with the packer 4 from the aquifer, the injection of hypan (8 m3) and cementing of the aquifer 1 through the reaction tip were performed by pumping cement in the amount of 3 m3. Then the tubing is raised together with the packer 4 so that its lower end is 2 m below the perforations 12 of the reservoir, and the back-flushing of the well removes excess cement mortar (Fig. 3). After that, the tubing 2 is raised and the reaction tip 3 is 5-6 m higher and the well is left on

Ozts. After RFQ pumped into the well through the tubing 27% aqueous solution of inhibited hydrochloric acid in the amount of 0.4 m3, | then it is pumped with water in an amount of 3.5 me (tubing with a diameter of 73 mm) and left for 40 minutes in the zone of the reaction tip 3 to dissolve the magnesium plugs 6 (Figures 3 and 4). After this, the ball H is dropped into the tubing which fits into the saddle 15 of the reaction tip 3, blocking the central hole 16. Test the pump (through removal of magnesium plugs 6) by the pump unit through the tubing to check the readiness of the circulating fluid through the annulus at the wellhead. Then, in-tubing with 3.0 m of hydrochloric acid of 27% concentration and 0.2 m3 of water was pumped in, granulated magnesium was loaded (figure 4) in an amount of 100 kg in the tubing (through a solution with the reservoir rocks, the well was mastered.

Combining the processes of isolating reservoir waters with the subsequent processing of an oil-saturated reservoir makes it possible to increase the success of work by about 20% and the productivity of the well in the range of 50-60%.

jg The advantage of this method is that there is no need for a strict regime of acid pumping through the reaction tip, which allows you to adjust the flow depending

J5 from the injectivity of the formation (using known methods, this is one of the most important and difficult conditions).

Claims (1)

20 claims The method of processing the bottomhole formation zone, which includes carrying out the isolation of the water-saturated interval and by placing it manually), after which the next thermochemical effect is performed in the oil-saturated interval by pumping magnesium and acid through the pump-compressor pipes, characterized in that, in order to increase the efficiency of the treatment process, before carrying out the isolation of the water-saturated interval on the pump-compressor pipes, the reaction tip with a hole in the bottom end is lowered to the water-saturated interval cement solution is pumped through it, and before thermochemical exposure it is installed in the oil-saturated interval, cover the hole in the bottom end and load it with magnesium, and Acid injection is carried out simultaneously through the reaction nozzle and through the annulus. the injection of 6 me of hydrochloric acid through the tube space and, when it reaches the reaction tip (3.5 m), the acid is pumped simultaneously and through the annulus in the ratio. Acidic solution after mixing with hot acid has a rather high concentration (12-14%), heated after mixing to a temperature of more than 100 ° C, the acid solution is forced into the bottom zone of the formation. At the same time, the sparingly soluble reaction products remain in the inner cavity of the reaction tip, being retained in its chaps. After holding the wellbore zone in the acid bath for 1-2 hours, which is necessary for the action of acidic solution with rocks of the reservoir, the well mastered. Combining the processes of isolating reservoir waters with the subsequent treatment of an oil-saturated reservoir makes it possible to increase the success of the work by about 20% and the productivity of the well in the range of 50-60%. The advantage of this method is that there is no need for a strict mode of pumping acid through the reaction tip, which allows you to adjust the flow depending from the injectivity of the formation (using known methods, this is one of the most important and difficult conditions). 0 claims The method of processing the bottomhole formation zone, including the isolation of the water-saturated interval and the subsequent thermochemical effects in the oil-saturated interval by pumping magnesium and acid through the pump-compressor pipes, characterized in that, in order to increase the efficiency of the treatment process, before carrying out the isolation of the water-saturated interval on the pump-compressor pipes, the reaction tip with a hole in the bottom end is lowered to the water-saturated interval cement solution is pumped through it, and before thermochemical exposure it is installed in the oil-saturated interval, cover the hole in the bottom end and load it with magnesium, and Acid injection is carried out simultaneously through the reaction nozzle and through the annulus. FIG. 2 fiyo.Z fiol