The alignment profile injectivity of injection wells

 

(57) Abstract:

The invention relates to the field of oil and can be used to align the profile of the injection well. Improves the efficiency of the alignment of the profile injectivity of injection wells in fractured reservoirs. The inventive determine the fluid properties of the reservoir. Into the formation water, Sadko - and/or gel-forming compositions having voting penetrating power. According to the invention on the results of well tests to determine the volume of cracks in the bottomhole formation zone. Into the formation cement mortar with plasticizers and fluid loss to the extent that the filling of cracks in the bottomhole formation zone, and reducing the intake capacity not exceeding 300 m3/day. The injection of water compositions performed at a pressure of 11 MPa after curing of the cement slurry.

The invention relates to the field of oil production and is intended to align the profile of the injection well.

There is a method of alignment of the profile of injection wells, including the definition foroudi Sadko - and/or gel-forming compositions, selectively penetrating into the layers [1].

The effectiveness of the method significantly decreases in the presence of cracks penetrating neftegazonosnye layers.

The technical task of the invention is to increase the efficiency of the alignment of the profile of injection wells in fractured reservoirs.

To solve the problem in the process of alignment of the profile of injection wells, including the determination of the filtration properties of the reservoir and the subsequent injection of water, Sadko - and/or gel-forming compositions having voting penetrating ability, the results of geophysical and hydrodynamic research to determine the volume of cracks in the bottomhole formation zone and into the formation cement mortar.

In the preparation of cement mortar (if zatvorenii) enter plasticizers and fluid loss, which increases its mobility and penetrating properties.

The amount of cement should provide for the filling of cracks in the bottomhole formation zone and the reduction of its pickup to the value not exceeding 300 m3/day.

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To implement the method according to the results of GIW (GIS) to determine the volume of cracks in the bottomhole formation zone and the injectivity profile.

Prepare the cement slurry, which for crack isolation in the wellbore area requires about 2 - 8 m3. To increase and preserve the mobility of the cement during its preparation in the mixing water is injected chemical additives: plasticizers and fluid loss. As a plasticizer at temperatures up to 130°C tested and showed good results the following reagents, in wt.%: the sulfite yeast mash (RRT) - 0,1-1,0; condensed sulfite alcohol bard (kssb) - 0,1-0,7; ferrochromolignosulfonat (FHLS) - 0,2-0,6; polyphenol resin (PFLH) - 0.1 to 0.3; Aksel - 0,1-3,0; bichromate sodium and potassium - 0,3-1,0; sulfonic acid NP-1A (on THE-6-01-1816-75) - 0,075-0,15. To reduce water loss, you can use: aksil - 0,1-3,0; dextrin, modified starch (MK) - 0,2-1,5; gipan - 0,1-0,5; carboxymethylcellulose (CMC) is 0.5 to 2.0. It is established that a universal tool is Aksel.

The injection of cement into the formation is performed via installed in the injection borehole column tubing with a packer. In the injection process, CEM is emistat decreased and did not exceed 300 m3/day.

After the cement slurry displacement in the reservoir preservation pickup well leave under pressure during curing of the cement slurry. Then into the formation by any of the known technologies, by mixing aqueous solutions of reagents (compounds) in the mouth or in the reservoir, pumped water compositions, for example, viscoelastic gels and/or a polymer-dispersed and fibrous structures. The injection is carried out in a volume of 100-400 m3at a pressure of 11 MPa.

Well kept on the formation of the gel (or sludge), and then spend hydrodynamic studies or GIS to assess changes in injectivity profile. If necessary insulation work can be repeated.

On completion of the injection well into operation.

The source of information

1. RF patent № 2175053, MKI7E 21 IN 43/00, 1999.

The alignment profile injectivity of injection wells, including the determination of the filtration properties of the reservoir with subsequent injection of water, Sadko - and/or gel-forming compositions having voting penetrating power, characterized in that according to the results of isrelatively and fluid loss in volume, ensure the filling of cracks in the bottomhole formation zone, and reducing the intake capacity not exceeding 300 m3/day, and the injection of water compositions performed at a pressure of 11 MPa after curing of the cement slurry.

 

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