RU2752371C1 - Method for conducting hydraulic fracture treatment in inclined-directed oil-producing well operating two productive formations - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to the oil and gas industry, or rather to the implementation of an interval hydraulic fracture treatment in inclined-directed oil-producing wells that have opened and operated two productive formations. The method includes silencing the well, removing the existing downhole equipment, lowering into the well an arrangement consisting (bottom-up) of a funnel, a lower packer of the mechanical principle of action, a HFT coupling, an upper packer of the hydraulic principle of action, a mechanical locator of couplings, an emergency adapter, a connecting element. The packer is activated by the mechanical principle of operation, after which the fracture fluid is injected with the proppant agent under pressure, as a result of which technological cracks of HFT are created in the lower productive layer. The ball is discharged through the tubing string to the HFT coupling, hydraulic pressure of the fracturing fluid is applied to the tubing string, the upper packer is activated, after which the shear screws of the HFT coupling are cut, as a result of which the coupling circulation channels are opened, the fracturing fluid with the proppant is pumped through the arrangement under pressure, as a result of which technological cracks of HFT are created in the upper productive layer. After extracting the HFT arrangement, the well is washed.EFFECT: development of a hydraulic fracture treatment (HFT) arrangement, which allows to conduct for two more volumetric hydraulic fractures in a row in an inclined-directed well without transplanting packers, thereby allowing to optimize the cycle of measures during hydraulic fracturing.1 cl, 9 dwg

Description

The invention relates to the oil and gas industry, and more precisely, for the implementation of interval hydraulic fracturing in directional oil production wells that have opened and operated two productive formations.

The objective of the claimed invention is to perform interval hydraulic fracturing in directional oil producing wells that have opened and operated two productive formations.

The technical result consists in the development of a hydraulic fracturing arrangement that allows two large-volume hydraulic fracturing of the formation in a row in a directional well without replacing packers, thereby allowing to optimize the cycle of measures during hydraulic fracturing and to reduce the financial and time costs for replacing the packer between hydraulic fracturing stages and normalizing the bottom of the well after after hydraulic fracturing using coiled tubing or workover crew.

The task and the technical result are achieved by the fact that the method of hydraulic fracturing in a directional oil producing well, operating two productive formations, includes killing the well, extracting the existing downhole equipment, lowering the assembly into the well, consisting of (bottom-up): a funnel, mechanical bottom packer, hydraulic fracturing sleeve, hydraulic top packer, mechanical collar locator, emergency sub, connecting element. The mechanical packer is activated. After that, the injection of the fracturing fluid with proppant under pressure is carried out, as a result of which technological hydraulic fractures are created in the lower productive formation. Further, through the tubing string to the hydraulic fracturing collar, the ball is dropped, the hydraulic pressure of the fracturing fluid is supplied to the tubing string, the upper packer is activated, after which the shear screws of the hydraulic fracturing collar are sheared, as a result of which the circulation channels of the collar are opened. Fracturing fluid with proppant is pumped through the assembly under pressure, as a result of which technological hydraulic fractures are created in the upper reservoir. After removing the hydraulic fracturing assembly, the well is flushed out. At the end, equipment is lowered into the well on a tubing string for operation.

The method is carried out as follows (Fig. 1-9).

From the directional oil production well 1, operating productive formations 2 and 3 through perforation intervals 4 and 5, after killing, the existing downhole equipment 6 is retrieved (Fig. 1).

Further into well 1 on tubing string 7, an assembly is lowered, consisting of (bottom-up): funnel 8, lower packer of mechanical principle of action 9, installed above perforation interval 4, upper packer of hydraulic principle of action 10, installed above perforation interval 5, mechanical collar locator 11, emergency sub of hydraulic principle of operation 12, connecting element 13 connecting the assembly with tubing string 7. Between packers 9 and 10, in the interval of productive formation 3, there is a hydraulic fracturing collar 14 (Fig. 2).

After running the assembly to the specified depth, the hydraulic fracturing sleeve is in the closed position. Hydraulic fracturing in a directional well is carried out from the bottom up, starting from productive layer 2 and ending with productive layer 3.

Before hydraulic fracturing in the productive formation 2, the packer of the mechanical principle of action 9 is preliminarily activated by rotating the tubing string 7 and creating an axial load on the packer 9 (Fig. 3).

After activating the packer 9, a fracturing fluid with a proppant is injected through the assembly under pressure, as a result of which technological fractures 15, filled with proppant 16, are created in the productive formation 2 (Fig. 4).

Further, through the tubing string 7, up to the hydraulic fracturing sleeve 14, the ball 17 is dropped, which sits in the seat of the sleeve 18, held by shear screws 19 (Fig. 5).

The hydraulic pressure of the fracturing fluid is supplied to the tubing string 7, the upper packer 10 is activated, after which the shear screws 19 of the hydraulic fracturing sleeve 14 are cut, as a result of which the circulation channels 20 of the sleeve 14 are opened (Fig. 6).

Through the assembly, as well as through the open channels 20, a fracturing fluid with proppant is pumped under pressure, as a result of which technological fractures 21 filled with proppant material 22 are created in the productive formation 3 (Fig. 7).

Hydraulic fracturing in productive formation 3 must be carried out with proppant re-injection into formation 3. After hydraulic fracturing, gel breakdown and breakdown of the upper packer 10, it is necessary to pump the mud with viscous packers along the annulus with circulation in order to flush out the proppant residues from the interpacker space (Fig. . eight).

After the complete extraction of the hydraulic fracturing assembly, the well is flushed out. The necessary equipment 24 is lowered into the well on the tubing string 23 for operation (Fig. 9).

Explanations for figures

1 - Well

2, 3 - Productive layers

4, 5 - Perforation intervals

6 - Downhole equipment

7 - Casing tubing with layout

8 - Funnel

9 - Packer of mechanical action

10 - Packer of hydraulic action

11 - Mechanical locator of couplings

12 - Emergency sub of hydraulic principle of operation

13 - Connecting element

14 - hydraulic fracturing sleeve

15, 21 - Hydraulic fractures

16, 22 - Propping material in hydraulic fracture

17 - Ball

18 - Bushing saddle

19 - Shear screws

20 - Channels in the form of holes

23 - A string of tubing with downhole equipment

24 - Downhole equipment for operation.

Claims (1)

A method of hydraulic fracturing in a directional oil production well, operating two productive formations, characterized in that it includes killing the well, extracting the existing downhole equipment, lowering the assembly into the well, consisting of (from bottom to top): a funnel, a lower packer of a mechanical principle of action , hydraulic fracturing coupler, hydraulic top packer, mechanical coupler locator, emergency sub, connecting element; the mechanical packer is activated; after that, the injection of the fracturing fluid with proppant under pressure is carried out, as a result of which technological hydraulic fractures are created in the lower productive formation; then the ball is dropped through the tubing string to the frac sleeve, the hydraulic pressure of the fracturing fluid is supplied to the tubing string, the upper packer is activated, after which the shear screws of the frac sleeve are sheared, as a result of which the circulation channels of the sleeve open; fracturing fluid with proppant is pumped through the assembly under pressure, as a result of which technological hydraulic fractures are created in the upper reservoir; after removing the hydraulic fracturing assembly, the well is flushed; at the end, equipment is lowered into the well on the tubing string for operation.

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