Method for horizontal well bottom zone interval treatment

FIELD: oil production, particularly methods for stimulating production by forming crevices or fractures using eroding chemicals.

SUBSTANCE: method involves determining zones characterized by different oil saturation and permeability in horizontal uncased well bore; arranging flow string in cased vertical part of the well; locating extreme-line coiled tubing pipe inside flow string; arranging coiled tubing pipe end opposite to reservoir zone having minimal oil saturation and permeability; injecting acid solution in well through extreme-line coiled tubing pipe; lifting extreme-line coiled tubing pipe in cased well zone; forcing acid solution in reservoir through flow string; serially arranging extreme-line coiled tubing pipe end in reservoir zones characterized by increasing oil saturation and permeability; injecting acid solution in well through extreme-line coiled tubing pipe aligned with each zone; lifting extreme-line coiled tubing pipe in casing pie; forcing acid solution in reservoir through pipe string; performing time-delay and carrying out swabbing operation. Acid solution is forced at rate of 3-4 m3/hour under 1-3 MPa pressure at well head.

EFFECT: increased deliverability of well drilled in non-uniform reservoir.

1 ex

 

The invention relates to the oil industry and can find application in the treatment of bottom-hole zone in horizontal wells wells.

The known method interval processing bottom-hole zone of horizontal wells, according to which the entire length of the rejected barrel determine the porosity, permeability and saturation stalk zone. Them set intervals, low permeability, assess the degree of cavernosal and trunk diameters at their ends. Based on the characteristics of the identified intervals on the surface mount pipe layout at the end of which set the ring under saddle locking ball on both ends of the hydraulic packers. Between them in the pipe layout perform radial end-to-end calibrated channel. Secure the pipe layout on the end of the pipe string and lowered into the borehole rejected to the mouth of the barrel. When nezaplanirovannyj the packers do a reverse or direct leaching of the barrel. Subsequently pumped into the borehole acid in a volume equal to the volume of the first processing interval. Discharge shut-off ball spacerowa with both ends of the bottom interval of the barrel, low permeability and simultaneously crush him in acid, and then leave a hole on the reaction. Then both packer rapacuronium, hold back about the ku trunk. Remove the reaction products and raise to the surface of the locking ball. Through lift pipe string, the pipe layout with packers translate in the opposite direction from the bottom toward the second area from the bottom of the interval, low permeability and repeat the above operations. Alternately conduct operations with each processing interval. Improving the efficiency of the treatment fluids zone rejected barrel due to selective effects on each interval in a single descent device for processing (Patent RF №2247832, CL EV 43/27, publ. 2005.03.10).

The known method does not allow sufficiently to increase the productivity of the well.

Closest to the invention to the technical essence is a way of interval processing bottom-hole zone of horizontal wells, which are as follows. Carry out the injection interval in the bottom zone of the acid solution. The sequence of injection set far from interval to interval closest to the vertical wellbore. Download lead through the column tubing. When processing the next interval, move the end of the column tubing to the treated interval. In each of the processed interval inject the acid solution and an aqueous solution of the emulsifier.

The injection of acid and emulsifier is carried out with a flow rate of 24-35 m 3/day and at a pressure in the mouth on the column tubing of 0.8-1.5 MPa. Spend the technological holding no more than 3 hours and perform swabbing to depression on the bottom hole is not lower than 3 MPa (RF Patent No. 2278966, CL EV 43/27, publ. 2006.06.27).

There is a method allows to increase the productivity of wells, however, are ineffective in the treatment of wells that discover reservoir with high heterogeneity.

The invention solves the problem of increasing the productivity of horizontal wells, which revealed the formation with high heterogeneity.

The task is solved in that in the method of interval processing bottom-hole zone of horizontal wells, including injection interval through the string of tubing into the well of the acid solution, the displacement of the acid solution into the formation, conduct technological exposure and swabbing, according to the invention, the column tubing is placed in the cased vertical part of the well, inside the column tubing place the collar without coupling pipe, coiled tubing, define the zones of horizontal open hole wells with different saturation and permeability, pipe end of the coiled tubing is placed opposite the zone with the minimum oil saturation and permeability, pumped into the well through the collar without coupling t is Ubu coiled tubing acid solution, raise the collar without coupling pipe coiled tubing in a cased the well area, push the column tubing solution of the acid into the formation, then place the end of the collar without coupling pipe coiled in series formation zones with increasing saturation and permeability, opposite each zone is injected into the hole through the collar without coupling pipe coiled tubing acid solution, raise the collar without coupling pipe coiled tubing in a cased zone of the bore hole and push the column tubing solution of the acid into the formation, while the displacement of the acid solution is conducted with a flow rate of 3-4 m3per hour at a pressure at the wellhead 1-3 MPa.

Features of the invention are:

1) interval injection through the string of tubing into the well of the acid solution;

2) displacement of the acid solution into the reservoir;

3) conducting technological extracts;

4) swabbing;

5) placement of the column tubing in a cased vertical part of the borehole;

6) placement inside the column tubing collar without coupling pipe coiled tubing;

7) determination of the zones of horizontal open-hole wellbore with different saturation and permeability;

8) placement of a tube end of the coiled tubing opposite the zone with the minimum oil saturation and permeability;

9) Zack the CA in the hole through the collar without coupling pipe coiled tubing acid solution;

10) the rise of the collar without coupling pipe coiled tubing in a cased the well area;

11) the displacement of the column tubing acid solution into the reservoir;

12) next, the placement of the end collar without coupling pipe coiled in series formation zones with increasing saturation and permeability, opposite each zone injection well through the collar without coupling pipe coiled tubing acid solution, the rise of the collar without coupling pipe coiled tubing in a cased the well area and the bursting of the column tubing acid solution into the reservoir;

13) the displacement of the acid solution with a flow rate of 3-4 m3/h;

14) the same when the pressure at the wellhead 1-3 MPa.

Signs 1-4 are common with the prototype, signs 5-14 are the salient features of the invention.

The invention

During the operation of oil and injection of horizontal wells is the deposition clogging elements that reduce the permeability of the bottom zone and, consequently, reducing well productivity. Traditionally used technologies interval of bottomhole zone treatment solution of hydrochloric acid leads to minimal effect. The invention solves the problem of increasing the productivity of horizontal wells, which revealed the formation with high heterogeneity. The problem is solved after the existing image.

When the interval treatment of bottom-hole zone of a horizontal well define the zones of horizontal open-hole wellbore with different saturation and permeability. The column tubing is placed in the cased vertical part of the borehole. Inside the column tubing place the collar without coupling pipe coiled tubing. The pipe end of the coiled tubing is placed opposite the zone with the minimum oil saturation and permeability. Pumped into the well through the collar without coupling pipe coiled tubing acid solution. Raise the collar without coupling pipe coiled tubing in a cased the area well. Push the column tubing solution of the acid into the formation. Next, place the end of the collar without coupling pipe coiled in series formation zones with increasing saturation and permeability. Opposite each zone is injected into the hole through the collar without coupling pipe coiled tubing acid solution. Raise the collar without coupling pipe coiled tubing in a cased the area well. Push the column tubing solution of the acid into the formation. Spend the technological holding no more than 3 hours. Perform swabbing to depression on the bottom hole is not lower than 3 MPa.

The displacement of the acid solution is conducted with a flow rate of 3-4 m3per hour at a pressure at the wellhead 1-3 MPa. As restorability use 10-15%solution of hydrochloric acid.

Specific example

Spend interval processing bottom-hole zones of oil horizontal well length 250 m Define the zones of horizontal open-hole wellbore with different saturation and permeability. Identify three zones with saturation (D.%) and permeability (MD), respectively 0,859 and 27.6, 0,887 and 41, 0,892 and 43.6. The bottom of the column tubing is placed in the cased vertical part of the borehole at the depth of cased columns. Inside the column tubing place the collar without coupling pipe coiled tubing.

The lower end of the pipe coiled tubing is placed opposite the zone with the minimum oil saturation and permeability 0,859 and 27.6. Pumped into the well through the collar without coupling pipe coiled tubing 12%solution of hydrochloric acid in a volume of 20 m3. Raise the collar without coupling pipe coiled tubing in a cased the area well. Push the oil through the tubing pipe acid solution into the reservoir with a flow rate of 3 m3per hour at a pressure head of 1 MPa.

Place the end of the collar without coupling pipe coiled in the area with the next largest oil saturation and permeability 0,887 and 41. Opposite this area is injected into the hole through the collar without coupling pipe coiled tubing 12%solution of hydrochloric acid in a volume of 25 m3. Raise the collar without coupling pipe coiled tubing is lined area well. Push the column tubing the acid solution into the reservoir with a flow rate of 3.5 m3per hour at a pressure head of 2 MPa.

Place the end of the collar without coupling pipe coiled in the area with the next largest oil saturation and permeability 0,892 and 43.6. Opposite this area is injected into the hole through the collar without coupling pipe coiled tubing 12%solution of hydrochloric acid in the amount of 30 m3. Raise the collar without coupling pipe coiled tubing in a cased the area well. Push the column tubing the acid solution into the reservoir with a flow rate of 4 m3/h at a pressure in the mouth 3 MPa.

Spend the technological holding no more than 3 hours. Perform swabbing to depression on the bottom hole is not lower than 3 MPa.

As a result, the flow rate was 12 m3/day. In similar conditions when performing work on the prototype of the well production rate does not exceed 4 m3/day.

The application of the proposed method will allow to solve the problem of increasing the productivity of horizontal wells, which revealed the formation with high heterogeneity.

The method of interval processing bottom-hole zone of horizontal wells, including injection interval through the string of tubing into the well of the acid solution, the displacement of the acid solution into the formation, conduct technological exposure and swabbing, ex is different, however, that column tubing is placed in the cased vertical part of the well, inside the column tubing place the collar without coupling pipe, coiled tubing, define the zones of horizontal open-hole wellbore with different saturation and permeability, pipe end of the coiled tubing is placed opposite the zone with the minimum oil saturation and permeability, pumped into the well through the collar without coupling pipe coiled tubing acid solution, raise the collar without coupling pipe coiled tubing in a cased the well area, push the column tubing solution of the acid into the formation, then place the end of the collar without coupling pipe coiled in series formation zones with increasing saturation and permeability, opposite each zone download in the hole through the collar without coupling pipe coiled tubing acid solution, raise the collar without coupling pipe coiled tubing in a cased zone of the bore hole and push the column tubing solution of the acid into the formation, while the displacement of the acid solution is conducted with a flow rate of 3-4 m3/h at a pressure at the wellhead 1-3 MPa.



 

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1 tbl

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