RU2620818C1 - Method of simultaneous-separate operation of well with hydrofracturing - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method of simultaneous-separate operation of a well with hydrofracturing with the use of a drillable bridge plug with a valve, in wells with two or more productive layers is realized in that the bridge plug is installed above the underlying layer from the treated one by means of a setting tool with a chopper valve with electric drive on a cable or hydraulic setting tool on tubing pipes. After removing the setting tool, the packer is sealed with a throw ball and the upper seams are hydrofractured according to the known technology without shutting down the lower ones and without removing the packer that ensures seam separation and their simultaneous-separate operation. When the well is put into operation, the upper layers are running. If the lower layer has more performance than the upper one, it works by raising the throwing ball. At low productivity of the lower layer, the drillable bridge plug prevents from oil well fluid forcing-through from the upper layers into the lower one.

EFFECT: providing the ability to perform work on hydrofracturing of the upper seams without shutting down the lower ones and without removing the packer that ensures seam separation and their simultaneous-separate operation.

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Description

The invention relates to the borehole development and operation of multilayer fields using hydraulic fracturing, operated by a single well. It allows to carry out hydraulic fracturing of overlying strata without disconnecting the lower ones and without removing the packer, which ensures the separation of layers and their simultaneous separate operation.

A known method of hydraulic fracturing of a carbonate formation (analogue) (1), patent for invention RU No. 2455478 IPC ЕВВ 43/26, application filing date 04.02.2011, published July 10, 2012. The method includes perforating the walls of the borehole in the required interval of the borehole with channels with a depth of at least the length of the stress concentration zone in the rocks from the borehole, lowering the pipe string into the hydraulic fracturing zone with the packer sealing the annulus above the perforation interval and cyclic injection of a gel-like fracturing fluid into the borehole. Before hydraulic fracturing, the well is filled with process fluid for 0.2-0.4 volume of the wellbore, the total volume of injected gel-like fracture fluid is calculated by the formula: Vg = k * Np, where Vg is the volume of gel-like fracture fluid, m ³ ; k = 1.4 ÷ 1.6 - conversion coefficient, m ³ / m; Np is the length of the opening interval, m. The gel-like fracturing liquid is pumped in equal portions in 3-5 cycles with the injection of acid portions of 0.7-0.75 of the volume of the gel-like fracturing liquid after them; at the end of the last injection cycle, salable oil or fresh water in one and a half times the volume of the pipe string, followed by an exposure of 1-2 hours, after which the reaction products of the acid with the rock are removed, the packer is removed and removed from the pipe string from the well. The disadvantages of this method are the need to perform perforation, work on the removal of the packer.

A known method of hydraulic fracturing (analogue) (2), RF patent No. 2055172 ЕВВ 43/26, application filing date 02.10.1994, published 02.27.1996, including descent into the well to a given depth of a sandblasting puncher with a rotator, cutting slits in the horizontal plane reservoir, lifting a rotary hammer with a rotator, lowering a tubing string with a packer into the well and installing it, sequentially injecting a fracturing fluid into a tubing string, a carrier fluid suspension with a fixing material, and odavochnoy liquid injection ramp providing downhole pressure above the formation fracture pressure, process speed and introduced into the well operation. The fracture fluid is pumped in a volume that ensures the creation of a hydraulic fracture with a length equal to the predetermined radius of the borehole zone of the formation of reduced permeability, then the bottom-hole pressure is lower than the fracture pressure by lowering the injection rate and the suspension of carrier fluid with a fixing fluid is pumped into the tubing string material in the volume of the created fracture, after which the increase in the injection rate increases the bottomhole pressure above the fracture pressure and injects liquid in a volume equal to the volume of the tubing string and part of the casing from the bottom of the tubing to the slits cut through. The disadvantages of the method are the high cost of time for work and the need for work to remove the packer.

There is a method of conducting a multi-stage hydraulic fracturing without lifting the downhole assembly (prototype) (3), patent RU No. 2374437, application filing date 07.06.2008, published November 27, 2009, in which the hydraulic fracturing process is carried out starting from the lower formation. Then, before the hydraulic fracturing of the formation located above, the isolation of the lower formation is carried out by feeding a mixture of technological fluid with proppant by washing the proppant into the cavity of the production string to a height exceeding the power of the treated formation. After that, they begin hydraulic fracturing of the overlying formation. So they continue to consistently act on the higher layers, processing them, going from the bottom up. According to the invention, the process of washing the proppant into the cavity of the production string, after hydraulic fracturing, is performed in two stages. The first of these steps is filling the production string with proppant with a particle size equal to the particle size used in the previous process, for example 0.4-0.6 mm. In this case, the corresponding interval is filled by 90-95% along the length of the wellbore. At the second stage, proppant is injected with the smallest possible particle size, for example, 0.1-0.15 mm, and full-length filling is performed. Transportation of the first portion of large proppant is carried out at a flow rate corresponding to the flow rate determined for the previous technological operation, and transportation of the second at a flow rate of 0.1-0.2 of the flow rate in the first operation. After that, they begin to perform the process of hydraulic fracturing, located at a higher level.

The disadvantages of the prototype are the large cost of time for work and the need for multi-packer layout, the inability to separate the layers during the operation of the well.

The technical problem solved by the method of simultaneous-separate operation of a well with hydraulic fracturing is to create a hydraulic fracturing method that allows fracturing of overlying formations without disconnecting the lower ones and without removing the packer, which ensures the separation of layers and their simultaneous separate operation.

This problem is solved by the proposed method of simultaneous and separate operation of a well with hydraulic fracturing, in which the drillable packer plug is installed above the underlying reservoir, after which the packer is sealed with a throw ball and hydraulic fracturing of the upper formation is performed.

The essence of the invention lies in the fact that the method of simultaneous-separate operation of a well with hydraulic fracturing is realized by the fact that the packer plug is installed above the underlying from the formation being processed using a planting tool with a power-assisted valve on the cable or a hydraulic planting tool on the tubing. After removing the landing tool, the packer is sealed with a throw ball and hydraulic fracturing of the upper layers is performed without disconnecting the lower layers and without removing the packer, which ensures separation of the layers and their simultaneous separate operation. When putting a well into operation, the upper layers work. If the lower layer has a higher productivity than the upper one, it works by raising the throw ball; at a low productivity of the lower layer, the drillable packer plug prevents the well from being pushed from the upper layers to the lower one.

In FIG. 1 is a longitudinal sectional view showing the installation of a plug packer using a planting tool with an electric actuated flapper valve on a cable in the well between the processed and underlying formations.

In FIG. 2 shows, in longitudinal section, the installation of a plug packer using a hydraulic planting tool in a well between the workpiece and the underlying formation.

In FIG. 3 conventionally shows a section of a well during hydraulic fracturing.

In FIG. 4 conventionally shows a section of a well during commissioning. The remaining formations not involved in the processing are not shown in the figures. Installing the plug packer 1 (Fig. 1) using the planting tool 2 with a knockdown valve 3 with electric actuator 4 on the cable 6 is as follows. The assembly of the packer 1 and the landing tool 2 with the electric actuator 4 is pre-assembled. Next, the layout is lowered into the interval in front of the lower reservoir 9 on the cable 6. Then, the electric signal 4 is fed through the cable 6 to the electric actuator 4, the shear device of which destroys the knockout pin of the knocker valve 3 by rotation by opening the bore valve hole. As a result, the fluid from the well through the opening of the knocking valve 3 enters the planting tool 2, when it is activated, the packer 1 is installed. Then the shear elements 11 are destroyed, disconnecting the planting tool 2 from the packer 1.

Installing the packer plug 1 (Fig. 2) using a hydraulic landing tool 5 is as follows. The layout of the packer 1 and the hydraulic landing tool 5 are pre-assembled. Next, the layout is lowered into the interval in front of the lower reservoir 9 on the tubing. The throwing ball 7 is thrown and the packer 1 is installed by pressurizing the hydraulic landing tool 5. Then, the shear elements 11 are destroyed, disconnecting the landing tool 5 from the packer 1.

After installing the packer 1 (Fig. 1, 2, 3), throw a ball 8 is thrown, thereby drillable packer plug 1 is sealed. Next, hydraulic fracturing of the upper layer 10 is performed without disconnecting the lower 9 and without removing the packer 1, which ensures separation of the layers and at the same time separate operation. When putting the well into operation (Fig. 4), the upper formation 10 works. If the lower formation 9 has a higher productivity than the upper one, then it works by raising the throwing ball 8, while the low productivity of the lower formation 9, the drillable packer-robot prevents the penetration of the borehole fluid from upper layer 10 to the lower layer 9.

New is that the method of simultaneous-separate operation of a well with hydraulic fracturing is implemented by the fact that the packer plug is installed above the underlying reservoir. After removing the landing tool, the packer is sealed with a throw ball and hydraulic fracturing of the upper layers is performed without disconnecting the lower layers and without removing the packer, which ensures separation of the layers and their simultaneous separate operation.

Technological and technical results when using the method are achieved due to the fact that the method of simultaneous and separate operation of a well with hydraulic fracturing allows for hydraulic fracturing of overlying formations without disconnecting the lower ones and without removing the packer, which ensures the separation of layers and their simultaneous separate operation.

The economic effect of the use of the invention can be achieved by increasing the time between failures, accelerating installation, simultaneous and separate operation, and extending the life of the well.

Claims (1)

Method for simultaneous and separate operation of a well with hydraulic fracturing, hydraulic fracturing using a drillable packer plug with a valve, in wells with two or more productive formations, in which the packer plug is installed above the underlying reservoir using a planting tool with a power valve on a cable or a hydraulic landing tool on tubing, characterized in that after removing the landing tool, the packer is sealed with of the throwing ball and hydraulic fracturing of the upper layers without disconnecting the lower and without removing the packer, which provides separation of the layers and their simultaneous separate operation, and when the well is put into operation, the upper layers work, while if the lower layer has a higher productivity than the upper, then it it works by raising the throwing ball; at low productivity of the lower layer, the drillable packer plug prevents the well from being pushed from the upper layers to the lower.

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