The method of processing bottom-hole zone of the well

 

(57) Abstract:

The invention relates to the oil industry and can be used in the treatment of bottom-hole zone of the well, kolmat paraffin, asphaltene-tar and sludge deposits. In the method of processing bottom-hole zone of the well, including the selection of wells for processing, filling the injection of the composition to dissolve asphaltene-resin-paraffin deposits - solution mixture of heavy pyrolysis resin TPS and ciproxina-157 in the hydrocarbon solvent, the displacement of the structure in the bottom-hole zone of the well, carrying out technological extracts and running well in operation, carry out the selection of wells with reservoir pressure below the saturation pressure of oil by gas injection at the speed of 3-4 l/s, use a solution of 0.5 to 9.0% at the ratio specified ciproxina and TPS (0,1-15,0):1. Moreover, the displacement carried out by the technical water, in addition to injection of the composition, or after technological shutter speed download acid solution, carry out the displacement of the acid solution technical water. The technical result is to increase the efficiency of processing bottom-hole zone of the well by increasing the finding relates to the oil industry and can be used in the treatment of bottom-hole zone of the well, kolmat paraffin, asphaltene-tar and sludge deposits.

A method of processing bottom-hole zone of the well, including the filling of the wells located on the site of the Deposit with low reservoir pressure, solvent asphaltene-resin-paraffin deposits (ARPD) 4-6% solution in oil mixture gasoline fraction with a content of saturated hydrocarbons, C6-C8at least 50% and organic synthesis products based on aromatic hydrocarbons, the first technological exposure for 6-10 hours when the initial set pressure at the wellhead of 2.5-3.5 MPa, the displacement of solvent in the bottom zone of the well, the second technological exposure for 6-10 hours, replacement of the solvent on the kill fluid and implosive effect (see RF Patent №2159322, MKI E 21 In 37/06, publ. 2000). The known method is not effective enough.

A method of processing bottom-hole zone of the well, including the filling of the wells located on the site of the Deposit with reduced pressure, the solvent paraffin - 4-6% solution in oil mixture gasoline fraction with a content of saturated hydrocarbons, C6-C8at least 50% of the organic product is based tubing to a depth of descent of the pump the solvent in the bottom zone to fill the wells solvent, descent heater in the perforated interval and the heating of the solvent in the perforation interval to a temperature of 80-90°C, removing the heater from the well, the blowing of the heated solvent oil in the bottom zone in the amount of 1.5-2.5 m3/m of the perforation interval, conducting technological shutter at the closed well within 12-24 hours and running well in operation (see RF Patent №2160359, MKI E 21 In 37/06, publ. 2000). However, the known method does not allow to achieve a significant increase in oil production rate.

Closest to the proposed invention is a method for processing bottom-hole zone of the well, including the filling of the production string and the column tubing to a depth of pump solvent a 3-6% solution in an organic solvent mixture of heavy pyrolysis resin (SCC) and ciproxina-157 in their mass ratio (9-11):1, the displacement of the downhole fluid solvent in the bottom zone to fill the wells of the solvent, the descent of the heater in the perforation interval and heating the solvent to a temperature of 80-90°C, removing the heater from the well, the displacement of the heated solvent oil in the bottom zone in the amount of 1.5-2.5 m3/m of the perforation interval, the p is m RF patent №2146003, MKI E 21 In 43/25, publ. 2000).

The known method does not provide a significant increase of additional crude oil, increasing the flow rate of the well and requires much energy, which makes it expensive and complicated technology.

The objective of the invention is to improve the efficiency of processing bottom-hole zone of the well by increasing the flow rate of the mining and recovery injectivity of injection wells.

The problem is solved in that in the method of processing bottom-hole zone of the well, including the selection of wells for processing, filling the injection of the composition to dissolve asphaltene-resin-paraffin deposits - solution mixture of heavy pyrolysis resin TPS and ciproxina-157 in the hydrocarbon solvent, the displacement of the structure in the bottom-hole zone of the well, carrying out technological extracts and running well in operation, carry out the selection of wells with reservoir pressure below the saturation pressure of oil by gas injection at a speed of 3-4 l/s, use a solution of 0,5-9,0%th at the ratio specified ciproxina and TPS (0,1-15,0):1.

Additionally, prior to injection of the composition, or after technological shutter speed download KIS the proposed method uses the following chemical products:

- deproxin-157 - block copolymers of ethylene oxide and propylene oxide based on ethylene diamine with a molecular weight of about 5,000 - in accordance with THE 6-14-614-096;

heavy pyrolysis tar is a by-product of ethylene production, resulting from the pyrolysis gasoline feedstock or a mixture of gasoline and natural gas, on THE other 38.1021256-89.

As the hydrocarbon solvent can be used, for example, a mixture of saturated hydrocarbons:

light distillate Chuguevskogo NIS (STD) - THE 0258-009-0147585-99;

or a broad fraction of light hydrocarbons (NGL) TU 38.0014636-065;

or gasoline unstable beyond 38.101.524-93;

or gas extraction on THE 38.0101.303-72;

or petrol BR-1 (gasoline "Shoe") TU 38.101 303-72;

or gasoline solvent BR-2 according to GOST 443-76;

or kerosene on the EAST 3801407-86 or GOST 10227-62;

- or straight-run distillate.

As the acid solution is used, for example:

- inhibited hydrochloric acid on THE 6-01-04689381-85-92;

- hydrofluoric acid on THE 6-09-2622-88;

- inhibited mixture of hydrochloric acid and hydrofluoric on THE 6-01-14-78-91.

For the implementation of the technology is built on the mouth of the well a mixture of ciproxina-157 and heavy pyrolysis resin in a hydrocarbon solvent. Used, stable and effective when used in temperatures from -40 to + 45°C at the wellhead, and does not cause corrosion of the equipment and does not affect product characteristics oil.

The method is as follows.

For treatment choose a producing well, prone to intense deposition of sediment, as well, the former in continuous operation, in which a reduced pressure below the saturation pressure of oil gas, which leads to the falling of heavy hydrocarbons in the bottomhole formation zone. Prepare two tankers type AC-5, a composition for dissolving paraffin and acid structure.

When the open annulus is injected into tubing pipe (tubing) at a rate of 3-4 l/s and brought to slaughter the estimated amount of the composition for dissolving paraffin, close the annular valve and a push composition in the bottom zone of the well. The amount of composition determined on the basis of data about the effective thickness of the reservoir in the perforation interval, the capacitive properties of the reservoir and the radius of the processing by the formula

V=R2·N·m·Knm3

where H is the effective thickness of the reservoir, m;

m - porosity;

1 m perforated formation thickness.

The amount of squeezing of the fluid is determined from the relation

Q=Qto-QTUBINGm3,

where Qto- the volume of exploitational columns for the current slaughter, m3;

qTUBING- volume tubing (tubing), m3;

where l is the length of the tubing, m;

L is the length of the production string, m;

d is the internal diameter of the tubing, m;

D - diameter of the production string, m

Next, perform a technological exposure for no more than a day.

For processing bottom-hole zone of the well, including carbonate rocks, additionally upload acid composition. The most effective acid composition in the processing of injection wells, when acid composition is injected prior to injection of the composition to dissolve the deposits, and in the processing of wells after the injection of the composition and conduct of the process of aging.

Studies have been conducted to determine the effectiveness of use of the composition for dissolving paraffin in the laboratory. The destruction efficiency of the samples of sediment taken from the bottom zones of individual wells, determine nami in relation to the analysis of the sample ARPD. The lower the basket the rest of ASPO, the more effective the composition. The research results are summarized in table 1.

Give specific examples of implementation of the claimed method in the processing of wells. The results are shown in table 2.

Example 1 (the proposed method). Handle bottom hole zone of the production well, composed of carbonate rock. Perforated thickness of layer 3 meters the Flow rate of 1.9 t/day production watercut of 13.1%. The well is equipped with a sucker rod pump. When the open annulus pumped through tubing with a speed of 3 l/s and brought to slaughter 0.4 t 5% mixture of heavy pyrolysis resin and ciproxina-157 at a ratio of 10:1 in Shugurovka the distillate. Push in the bottom zone of technical water and conduct technology exposure for 12 hours.

Next upload 6,72 t 12% hydrochloric acid with displacement in the reservoir technical water. Hold the shutter at the closed well. Then extract the spent reagents and run well into operation (see table 2, example 1).

Example 11 (a known way). Handle bottom hole zone of the production well depth of 1700 m, the/day. The well is equipped with a sucker rod pump. Spend filling bore solvent paraffin, consisting of a 5% solution in a wide fraction of light hydrocarbons mixture of heavy pyrolysis resin and ciproxina-157 in the ratio of 10:1. Heated solvent heater in the perforation interval to a temperature of 90°C for 12 hours. Next, push the heated solvent in the bottom zone and conduct technology exposure for 24 hours. Run the well into operation. The flow rate was 12.5 tons/day, and the water content was not changed and remained at the level of 35% (see table 2, example 11).

Examples of the treatment of injection wells. The results are shown in table 3.

Example 1. Handle bottomhole injection wells, composed of terrigenous rock.

Perforated thickness of layer 4 PM Pickup 150 m3/day, the discharge pressure of 100 ATM. When the open annulus pumped through tubing 200 kg 5% mixture of heavy pyrolysis resin and ciproxina-157 at a ratio of 15:1 in gasoline unstable.

Close the annular valve and push technical water pumped composition in the bottom zone and leave the m table 3, example 1).

Thus, the treatment of the well bottom zone of the proposed method using a composition for dissolving paraffin separately and together with the acid treatment can effectively handle the bottom-hole zone of the well, regardless of the pickup, folded as carbonate and terrigenous rocks, as well as to simplify and reduce the cost of technology.

1. The method of processing bottom-hole zone of the well, including the selection of wells for processing, filling the injection of the composition to dissolve asphaltene-resin-paraffin deposits - solution mixture of heavy pyrolysis resin TPS and ciproxina-157 in the hydrocarbon solvent, the displacement of the structure in the bottom-hole zone of the well, carrying out technological extracts and running well in operation, characterized in that choose from the well with the reservoir pressure below the saturation pressure of oil by gas injection at a rate of 3-4 l/C, use a solution of 0.5-9,%th at the ratio specified ciproxina and TPS (0,1-15,0):1.

2. The method according to p. 1, characterized in that, in addition to injection of the composition, or after technological excerpts tion water.

4. The method according to p. 2, characterized in that exercise displacement acid solution technical water.

 

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