Method for shutting a well

FIELD: oil and gas industry.

SUBSTANCE: method includes serial pumping into well of buffer, blocking and pressing liquid, blocking liquid contains hydrocarbon base, acyclic acid, caustic soda and mineral filler with following relation of components in percents of mass: hydrocarbon base 41-72, acyclic acid 6.1-14.4, caustic soda 4.9-13.0, mineral filler the rest. Hydrocarbon base of blocking liquid is oil or oil processing products. As mineral filler blocking liquid has calcium carbonate with diameter of particles no less than 2 micrometers.

EFFECT: higher efficiency, simplified maintenance, simplified construction.

3 cl, 1 ex

 

The invention relates to gazoneftedobyvayuschie industry, in particular the killing of wells in the overhaul.

There is a method of plugging the well, namely, that before killing the well in her consistently fetch buffer and blocking fluid composition, representing the chalk suspension containing chalk, flotation and water (A.S. USSR №1828912, CL E 21 In 33/138, 1993).

The disadvantage of this method is the low efficiency of the subsequent development wells due to the instability of the blocking composition and hydrophilization bottom-hole formation zone and, as a consequence, the deterioration of reservoir properties wellbore zone.

The closest analogue of the proposed method is a method of plugging wells, which consists in the fact that well consistently fetch buffer, blocking and shiawassee fluid and as a blocking fluid using at least two structures forming in the process of mixing viscous structure: composition No. 1, wt.%: a copolymer of styrene with maleic anhydride, treated with sodium hydroxide - 15-20, water - the rest; and the composition No. 2, wt.%: acetic acid - 4-5, water - the rest. Moreover, the compositions are prepared separately and pumped into the well consistently (RF patent No. 2144608, CL E 21 In 33/138, 1999).

The disadvantage of this method is the use of the group consist of many components, when the blocking structure formation fluid must have at least two compositions. In addition, use liquid water based also leads to hydrophilization layer, thus reducing its permeability to oil.

The objective of the invention is to increase the efficiency of the method of killing as a result of applying liquids with high clogging drilling horizontal capacity, as well as the improvement of the efficiency and simplification of the process of its preparation.

The problem is solved in that the process of killing the well includes an injection in her buffer, blocking and advocay liquids. What's new is that blocking fluid contains a hydrocarbon-based, acyclic acid, caustic soda, mineral filler, in the following ratio of components,%:

Petroleum base 41,0-72,0

Acyclic acid 6,1-14.4V

Caustic soda 4,9-13,0

Mineral filler rest.

As a hydrocarbon basis, you can use oil or oil processing products, as well as mineral filler is calcium carbonate with particle diameters not less than 2 μm.

The proposed method is effective for killing wells with abnormally low formation pressure with a solution of the main tasks for the preservation of reservoir properties of productive formation. And the use of acyclic acids in the interaction with caustic soda to form the oligomer chain acyclic monomers (n 30 above), spatial configuration which provides a strong structural grid. The introduction of mineral filler enhances the formation of coagulation structures, which increases the clogging drilling horizontal properties. Jelly-like structure solution when entering the reservoir generates instant filtration peel and membrane, which minimizes the penetration into the formation of solid particles.

When making way through cementing or other unit on the surface prepare the blocking fluid is hydrocarbon-based. For this purpose, the hopper Assembly fill hydrocarbon liquid in an amount to be determined. This fluid is injected estimated number of acyclic acid and the mixture is stirred. Then the mixture is injected volume of caustic soda 30%concentration. To improve structural viscosity, density, enter the estimated amount of the mineral filler.

In the process of renovations in the well pumped consistently estimated number of buffer fluid, then the specified number of blocking fluid is forced into the productive interval of the formation Sudocrem saline. Coming into a well of a blocking fluid forms in the process of filtration shallow clogging area and thin strong filtration is the Orochko. Then carry out the necessary repair work.

An example of the method.

1. Design and technical state well No. 855.

1.1. E/column ⊘ 168 mm - 1218 m

1.2. Perforation intervals 1130-1150, 1168-1194.

1.3. HKT d 114 mm lowered to a depth of 1157,6 m

1.4. Pressure - 39 ATM.

1.5. Static wellhead pressure of 36 atmospheres.

2. Brought well acyclic acid, for example, waste oil acids, gas condensate, caustic soda, calcium carbonate. Scored in the capacity of 5 m3(71.0 per cent) of gas condensate. With constant stirring introduced into the condensate 0.52 m3(7,4%) acyclic acid was mixed for 30 minutes. Prepared 0,41 m330% (5,8%) solution of caustic soda is introduced into the solution of a condensate with acyclic acid and mixed. In the solution circulation introduced to 2.9 tons (15.8 percent) of calcium carbonate and mixed until a homogeneous mass. Mounted sadavoy line, tied it with a fountain valves, compressed harness to 65 ATM, the tree - 50 ATM. Killing the well was done consistently with the injection tubing - 114 mm when closed annular valve 12.5 m3buffer liquid solution of calcium chloride having a specific gravity of 1.02 g/cm3then 6.5 m3blocking fluid displacement in the reservoir advocay liquid - solution PI is ristoro calcium with a specific gravity of 1.02 g/cm 3in a volume of 2.5 m3and 6.1 m3solution IPD (invert-micellar dispersion). Annular valve opened and pumped into the tubing 8.7 m3the IPD solution with a specific gravity of 1.02 g/cm3to exit solution from the annulus, while damaged gas. Fluid was pumped into the perforated intervals and pressed into the reservoir with the aim of killing and blocking the productive formation. The well was closed for determining the static level. After 42 hours defined static level Harticle=90 m, the excess pressure at the mouth was: PTr=0 ATM; Psatr=0 ATM. The amount of absorbed liquid was 2 m3. During the development of the well came on the operating mode during the day.

The indicators characterizing the efficiency of the inventive method, reflected in the fact that it provides high-quality block-absorbing layers (the amount of absorbed liquid was only 2 m3against 20-50 m3in the known methods), low instant filtering, not scarce raw components, the ease of preparation technology of the blocking fluid and the filtrate being an oil or its derivative, does not cause the formation of a water barrier and does not affect the properties of water-sensitive formations.

Repairs for killing wells with application of the proposed method b is okidoki allows you to save the reservoir properties of the formation and repeatedly to reduce the completion time.

1. Method of plugging wells, including injection wells sequentially buffer, blocking and advocay fluid, characterized in that the blocking fluid contains a hydrocarbon-based, acyclic acid, caustic soda and mineral filler in the following ratio of components,%:

Petroleum base 41,0-72,0

Acyclic acid 6,1-14.4V

Caustic soda 4,9-13,0

Mineral filler Rest

2. The method according to claim 1, characterized in that the hydrocarbon-based blocking liquid is an oil or oil refining products.

3. The method according to claim 1 or 2, characterized in that the mineral filler blocking fluid contains calcium carbonate with particle diameters not less than 2 μm.



 

Same patents:

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1 tbl

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