Well killing method

FIELD: gas production equipment, particularly for killing wells with reservoir pressure below hydrostatic pressure and for gas pipeline protection against water and mechanical impurities.

SUBSTANCE: method involves injecting methylcellulose used as gel-forming composition into well, wherein methylcellulose is introduced as foamed aqueous solution and density thereof may be regulated along the whole well borehole height.

EFFECT: possibility to regulate well killing liquid density along well borehole height, increased speed of well killing gel-forming composition production.

 

The present invention relates to the field of gas production, namely the killing of wells with reservoir pressure below hydrostatic, and the cleaning gas from water and mechanical impurities.

There is a method of plugging wells three-phase foams on the basis of surface-active substances (surfactants), stabilizer and additives (bentonite, chalk, etc.) /1/.

There is a method of plugging wells gelling compositions (WTP), for example an aqueous solution of polyacrylamide with staple /2/.

However, these methods have several disadvantages:

- the complexity of the composition and the associated difficulty of obtaining a well kill fluid with prescribed properties

- additives (bentonite and others) can collaterality a layer that impedes the development of the well.

the foam can deteriorate even in the presence of the stabilizer at elevated temperatures.

When killing the well gels on the basis of polyacrylamide necessary staple, and for the destruction of the STATE you want to apply special methods, making it difficult to develop well. In addition, when applying the above methods, it is impossible to regulate the density of the kill fluid in the wellbore and possibly absorption liquid reservoir in a formation pressure below hydrostatic pressure.

The closest in technical essence and the achieved result is SPO is about killing the well methylcellulose, which is injected in the form of solid rods /3/.

In the known method, there is no possibility of regulating the density of the kill fluid in the wellbore, and the time of the dissolution of the rod from the methylcellulose is large, which slows down the formation of gel-forming composition for killing the well.

The technical result of the invention is the ability to control the density of the kill fluid in the wellbore, and accelerate the formation of gel-forming composition for killing the well.

In the process of killing the well, including the entry into the well of methyl cellulose as a gelling composition, enters the methyl cellulose in the form of a foamed aqueous solution with the ability to regulate its density in the wellbore.

Prepare foamed aqueous solution of methyl cellulose, manufactured by THE 6-01-717-72 and THE 6-01-683-72 in the form of fibrous flakes, powder or granules white or yellowish with a true density 1290-1310 kg/m3.

The methylcellulose melts with decomposition at 290 - 305 °C.

Aqueous solution of methyl cellulose is produced by dissolving the calculated amount of solid methylcellulose necessary to obtain a working concentration volume of cold water.

The foam produced from the prepared aqueous solution of methylcellulose estimated concentration with the aid of the ejector, mechanical mixing and other known methods.

Prepared foamed aqueous solution of methylcellulose pumped into the well units or other intended for this purpose technique.

Well foamed aqueous solution of methylcellulose HeliRussia, forming a foamed gel that kills the well. Melirovanie foam occurs at a temperature of 45 - 55 °C.

If the temperature in the borehole is different from the temperature of gel formation, it can be modified using additives such as to increase and decrease the temperature.

The number and concentration of aqueous solution of methylcellulose for killing wells determined specifically for each well separately and depend on well characteristics (pressure, temperature, etc.) /5/.

For the destruction of the gel quite well, rinse with cold water to put the gel into the solution.

The use of the invention allows to adjust the density of the kill fluid in the wellbore and to reduce the time of gel formation in the well, so as a warm-up time of a thin film of liquid in the foam less than the time of the dissolution of the rod. This will reduce the probability of absorption of the liquid damping layer.

Sources of information

1. Directory of killing fluids. Krasnodar, Unicraft, 1989, pp.42-43.

2. Technology isolatiemateriaal, including without lifting lift pipes. RD 39-01-48332-89.

3. RF patent № 2146757, MKI E 21 In 33/138, publ. 1999

4. Cellulose and its derivatives. Edited Nbensa and Lseal. M

Subsoil, 1974, vol. 1, s, vol. 2, pp.109-115.

5. Ummersen, Cat, Vdelati. Repair gas wells. M: Subsoil, 1998, pp.92-100.

The process of killing the well, including the entry into the well of methyl cellulose as a gelling composition, characterized in that the carry input of the methyl cellulose in the form of a foamed aqueous solution with the ability to regulate its density in the wellbore.



 

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