Method of plugging wells

 

(57) Abstract:

The method relates to techniques and technologies for underground repair of wells, and in particular to methods of killing productive horizons (bottom zone) with abnormally low formation pressure gas and gas condensate wells for their repair. The technical result is to increase the efficiency of the capital repair of wells due to the acceleration of the dissolution of the rods in the well, increasing the temperature in the process of melirovanie, reliable delivery of the rods to the bottom of the borehole. The process of killing the well includes the manufacture of rods of methylcellulose, their descent in the bottom zone, dissolution in formation water and melirovanie formed solution, methylcellulose impose additional catalyst plugging, for example calcium carbide and/or natric sodium hydride calcium in the amount determined by the geological conditions of the wells.

The present invention relates to techniques and technologies for underground repair of wells, and in particular to methods of killing productive horizons (bottom zone) with anomalous low formation pressure gas and gas condensate wells for their repair.

This method requires the use of special equipment (mixer, pump unit, capacity) for the preparation, injection and produce solution into the well, as well as significant labor costs for Assembly and disassembly of wellhead piping pipes, additional activities and manifestations of extra care in compliance with safety regulations. And, as a result, the material costs for implementing this method is great because process takes a long time.

The closest in technical essence and the achieved result is a way of killing the well, including the descent generouse material in the form of rods, which are coming on the borehole bottom dissolved and heliroute (2).

For the manufacture of such rods with the killing of wells using methylcellulose.

However, the use of rods made of methyl cellulose, for use in the killing of wells has drawbacks.

The rods made from methylcellulose, slow (up to 2 - 7 days) dissolved in svn. These shortcomings make it difficult and more work in the process of repair of wells. All this reduces the efficiency of the process of killing the well.

The aim of the invention is to increase the efficiency of the capital repair of wells due to the acceleration of the dissolution of the rods in the well, increasing the temperature in the process of melirovanie, reliable delivery of the rods to the bottom of the borehole.

This objective is achieved in that in the known method of killing the well, including the manufacture of rods of methylcellulose, their descent in the bottom zone, dissolution in formation water and melirovanie the resulting solution according to the invention in methylcellulose impose additional catalyst plugging, for example calcium carbide and / or nitride of sodium, calcium hydride, in the amount determined by the geological conditions of the well.

The method consists in the following.

The rods are made before lowering them into the well of methylcellulose, while it impose additional accelerator dissolution of the rods in the well, which increases their weight. This accelerator may be, for example calcium carbide and(or) sodium azide, nastupaet in reaction with water, when the rods are destroyed into separate parts and accelerated dissolution, generates heat and increases the temperature of the medium that provides the acceleration of the process of melirovanie solution in the well.

In addition, the presence of one of the rods of these additives or their combination increases the weight of the rods, which reduces the delivery time and, therefore, eliminates the possibility of hanging rods on the way to slaughter.

Example. The rods are made by extrusion of fibrous or crystalline methyl cellulose, while adding in the form of crumbs or pieces solvent, for example, calcium carbide so that they are placed in the inner part and were evenly distributed along the entire length of the rod. Together with calcium carbide, you can add other additives, for example sodium azide, calcium nitride. These additives accelerator is injected into the terminals in any combination and in any ratio between them, namely cellulose. The number of input accelerator destruction in the manufacture of rods of methylcellulose determined experimentally for each case separately.

The number of rods by weight, re-entry into the well, determine the geological services of the odes in the well.

After fabrication of the rods down in the hole that reaches the bottom, dissolve and turn into a gel that provides a temporary jamming of the productive formation and maintenance work in the well.

The elimination of the gel from the well is rinsed with cold water.

The use of the invention improves the efficiency of capital repair of wells.

Sources of information:

1. U.S. patent N 32416112, E 21 B 33/138, 1966.

2. Temporary instruction to remove the liquid from the gas and gas condensate wells by using a foaming agent. Sat. Counihan. Stavropol, 1977.

3. I. D. Bull, F., Tuhbatullin, F. A. Shipov and other Foamable compositions for increasing the efficiency of operation of the wells. MF. "Gas industry", June, 1997, S. 39.

The process of killing the well, including the manufacture of rods of methylcellulose, their descent in the bottom zone, dissolution in formation water and melirovanie formed solution, characterized in that in methylcellulose impose additional catalyst plugging, for example, calcium carbide and/or nitride of sodium, calcium hydride in the amount determined Geology is

 

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FIELD: oil and gas production.

SUBSTANCE: solid foaming agent containing, wt %: carboxymethylcellulose 15-25, sodium sec-alkyl sulfate 5-15 and sodium sulfonate 25-35 (both anionic surfactants), additionally contains: sodium silicate 3-7, sodium carbonate 2-4, disodium ethylenediaminetetraacetate as complexone 1-3, and foaming-enhancing detergent - the rest.

EFFECT: increased efficiency in carrying over formation fluid from bottom of gas and gas condensate wells.

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