SU1237767A1 - Method of completing wells with subsequent hydraulic treatment of several producing formations - Google Patents

Description

one

The invention relates to the mining and oil industry and can be used to treat productive formations with water.

The aim of the invention is to increase the reliability of hydroprocessing of rocks in inclined and horizontal sections of the well.

The drawing shows a diagram of the point-by-point hydroprocessing of rocks through a well with a horizontal end of the barrel.

The method is carried out as follows.

From the day surface to the treated reservoir 1, a borehole 2 is drilled into which a column of 3 steel casing pipes, equipped with rigid screw-type centralizers, is lowered.

In the vertical part of the well, an insulating annular ring 4 is constructed from conventional cement material (for example, conventional cement cement pacfBop), in an inclined and horizontal part of the well, an insulating ring 5 is made from cement material that is not subject to sedimentation of the cement slurry solution (for example, on the basis of GTM-3 and others.) At the same time, the end of the ring 5 is located at a distance of 1-3 m from the bottom of the well, thus, excluding the operation of perforation of the casing string at the last hydroprocessing interval. The length is chosen taking into account the technical condition of the well, the properties of the rocks being processed and the parameters of hydrotreatment.

Non-hardening cement slurry is supplied to this unfixed area of well 2 and to the inside of casing 3 for the length of the entire section of the hydrotreated formation 1 - a pseudoplastic polycondensation fluid (PPJ) (after polydensation forms a separating plug 6 (for example, a fluid on a hypogastric fluid (for example, liquid on a hypogastric fluid), it forms a disconnecting plug 6 (for example, fluid on a hygroscopic plastic) ). The PPF ends up in the well through the casing string 3 of the casing under pressure and is held under pressure until complete polycondensation. Thus, the PPG, having viscosity and density at the stage of feeding into the well, close to viscosity and density of water, and being under pressure, presses the cement material in the insulating ring 5 against the walls

377671

borehole 2 and to the insulating ring 4, the insulating ring 4 is a buffer preventing the spreading of the grouting material from the insulating ring 5. Then, in the first interval of the well to be hydrotreated, perforations 7 are formed pipes 8, which are equipped with a packer 9 installed above the perforations (the installation location of the packer is determined for engineering and technical reasons depending on the required volume

15 pressure chambers 10), hydroprocess the formation I.

After injection into the first processing interval of the entire volume of the working fluid is removed from the well packer 9,

20 I erase the plug 6 to the second hydrotreatment interval and repeat the perforation process, the installation of the packer 9 in the second interval and the injection of the volume of working fluid.

5 Thus, the processes are repeated to complete treatment of the entire well.

Primer p. Hydroprocessing of sandstone rocks is scheduled through a vertically horizontal well No. 3.

 Sandstone is subject to small amplitude tectonic disturbances in this area,. The length of the well is 1865 m. The length of the horizontal part of the well, where hydroprocessing should be carried out, is 500 m, the vertical 950 m n is inclined - 415 m. The number of hydrotreating intervals is eight, the horizontal part of the well is drilled with a diameter of 216 mm. Casing pipes with a diameter of 146 mm are equipped with rigid screw centralizers that are installed after 15 m. Hard screw centralizers are a round metal rod with a diameter

5 20 mm, connected by welding helically on the surface of tubing. The casing is lowered to the downhole through cementing devices and a fast-setting cement grouting slurry with a volume calculated to fill the annular vertical (950 m) is fed through the internal space of the casing.

5 well sections. Immediately after serving a portion of the specified solution, a portion of the solution from a special material is fed into the well, for example

hydrophobic plugging material (GTM-3). Which is not subjected to sedimentation. The portion of the portion equals the volume of the annular space of the inclined and horizontal sections of the well, minus the volume of the bottomhole length of 3 m. Then, a portion of the polycondensable pseudoplastic fluid on a hypanoid base is injected into the bottomhole horizontal portion against the wellbore formation. The remaining part of the well volume is filled with water. The pressure is increased up to 10-15 MPa and the whole system is filled until the polycondensation of the HMT-3 and PPJ solutions.

After plugging, the perforator is lowered into the well in the first hydrotreatment interval and perforated to the obsadia coloin. Next, the punch is removed from the well and lowered

tubing column equipped with a packer (for example, PVA), which is mounted 0.5-1.0 m above the perforations, and

through the system, using the 4AN-700 units, the calculated amount of working fluid (in this case 12000 m of water) is injected. After the hydrotreatment has been completed, the packer device is disrupted, the tubing with the packer is raised to the surface, the bottom of the pumping and compression column is retooled, and the end perforator is lowered.

into the well, wash out a portion of the PGOK tube to the second interval, and produce a perforation of the casing in the second interval. The remaining intervals are processed

in the same sequence. In the last processing interval, there is no perforation of the casing coloin. In this way, hydrotreatment of rocks li, Sh.

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Editor M. Tsitkina Order 3266/34

Tehred I. Veres

Corrector A

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Proofreader A. Obruchar

Claims (2)

1. METHOD FOR COMPLETING WELLS WITH THE FOLLOWING HYDRO-TREATMENT OF SEVERAL PRODUCTIVE LAYERS, including lowering the casing string, the sequential injection of hardening cementing material with non-hardening followed by perforation of the casing string, characterized in that it is more difficult to drill and drill more grouting material is pumped into the vertical part of the annular wellbore, non-hardening material is placed inside the casing against It is activated in intervals and the latter against the annulus to the bottom of the processing interval between a non-solidifying and hardening plugging materials in the annulus is placed backfill material is not subjected to sedimentation, hydrotreating each interval after washout of non-solidifying material changes require tampo- e wasp and perforations; They are directed towards the bottom of the well, while the isolation of the treated intervals is carried out using a packer. 2. The method according to p. ^ Characterized in that polycondensable pseudoplastic fluid is used as a non-hardening grouting material.