Liquid for killing wells

 

The invention relates to the field of oil and gas, in particular liquids for perforating and plugging of wells. The technical result is the preservation of reservoir properties of productive layers in the secondary their showdown at runtime capital and current repairs of wells and other geological and technical measures, improving the efficiency of exploration wells. The technical result is achieved in that the fluid for plugging wells comprising a dispersion medium solution of magnesium chloride, diluted formation water applier well kill fluid, dispersed phase, the reagent fluid filter thickeners and surfactants surfactant, a solution of magnesium chloride contains more than 93% MgCl2,as the dispersed phase using chalk as a thickener - polyacrylamide PAA brand PRAESTOL 2530-2640, as surfactant - surfactant complex action snpch PKD-0515, in the following ratio, wt. %: the specified magnesium chloride 8-30, chalk 0-10 specified PAA 0,01-0,2, surfactant complex action snpch PKD-0515 from 0.01 to 3.0, the specified water the rest. Also fluid as specified solution of magnesium chloride may contain bischofite. 1 C.p. f-crystals, 1 the pits for perforating and plugging of wells.

Known liquid for killing wells (EGS) on the basis of mineral salts (produced water, produced water), sodium chloride, magnesium, calcium, phosphate salts [Catalog killing fluids. Krasnodar, 1989, S. 12-23, 42-46].

Also known liquid for killing the well, including lime, chloride salts of sodium, magnesium, aluminum, waste isopropyl alcohol from the stage sludge of crude alcohol and rectification of apurate, the reagent fluid filtration and water adopted by the authors for the prototype [RF Patent 2136854, publication date 10.09.99,].

The main disadvantages of these liquids jam is the formation of insoluble sediments in contact with formation water due to the presence in the dispersion medium of chloride salts of calcium, aluminum, resulting in clogging of the pores of the reservoir, as well as the relative complexity of preparation and low foaming, depending on the quality of waste isopropyl alcohol.

The objective of the invention is the preservation of reservoir properties of productive layers in the secondary their showdown at runtime capital and current repairs of wells and other geological and technical measures, improving the effectiveness of well development, the expansion of raw materials m the spine for killing wells, includes a dispersive medium is a solution of magnesium chloride, diluted formation water applier well kill fluid, dispersed phase, the reagent fluid filter thickeners and surfactants (surfactant), according to the invention the solution of magnesium chloride contains more than 93% MgCl2as the dispersed phase using chalk as a thickener - polyacrylamide PAA brand PRAESTOL 2530-2640, as surfactant - surfactant complex action - snpch PKD-0515, in the following ratio, wt.%: The specified magnesium chloride - 8-30 Chalk - 0-10 Specified PAA - 0,01-0,2 surfactant complex action snpch PKD-0515 - a 0.01 to 3.0 Water - the Rest and as specified solution of magnesium chloride it contains mainly bischofite.

The essence of the invention lies in the fact that the liquid is well killing is prepared by mechanical mixing of the components. The solution of magnesium chloride containing MgCl2>93%, for example bischofite, diluted formation water of the wells, which will be injected fluid damping. Bischofite is a natural salt that contains mainly MgCl2(over 95%) and other salts. This bright transparent oily gigaslave salts, magnesium chloride, mainly bischofite, with formation water of any degree of salinity and ionic composition absent the formation of insoluble precipitates. With regard to corrosion indicators, according to the results of laboratory tests of samples of the magnesium chloride content MgCl2more than 99%, when the contact of the sample plate brand Article.-3 with a solution of magnesium chloride at room conditions is insignificant exchange reaction between the metal plate and a solution of magnesium chloride, which is expressed by the rate of dissolution 0,046 g/m2hour, and more intensive exchange reaction at 115oC - 1,64 g/m2hour. A solution of magnesium chloride in water reservoir applier GGS is the dispersion medium. If necessary to increase the density of the solution in it add the calculated amount of salt MgCl2or2CO3. The dispersed phase particles are chalk, caso3faction grinding, corresponding to the size of the pores of the formation rock in the stalk zone wells, shut-in formation water. To thicken the mixture was added PAA brand PRAESTOL with an average anion activity (2530-2640) and molecular weight of 14-16 million, and as a surfactant-surfactant complex actions (SNPH PKD - 0515).

PA is containing a series of additives and solvent. This liquid from light yellow to light brown, with a mass fraction of water of 0.5%, the freezing temperature of minus 30 to minus 40oC and a flash point 40oC. Reagent produced according to TU 39-05765670 OP-211-95 (with changes 1 and 2) of the three brands a, B and H; grade a and B - for drilling muds; mark N. - killing fluids, perforating, conservation of the wells.

All components of the proposed composition GGS dissolve or shut the reservoir with water that object, which will use GGS. With stirring, the mixture is brought to a homogeneous condition and weight to the desired working density EGS.

The invention is implemented as follows.

Example 1: 8 g caso3(chalk) intensively stirred in formation water applier GIGS. The resulting suspension is added to a solution of bischofite, which is obtained by mixing to 7.32 g of bischofite in formation water (the content of MgCl2in bischofite is 95,7%). The mixture is infilled PAA brand PRAESTOL medium anionic activity 2550, with a molecular weight of 14 million, adding it to the amount of 0,05, in Addition, to reduce the surface tension of the mixture was added surfactant snpch PKD - 0515 in the amount of 0.5, the Number of produced water in poluchennym a result of the proposed invention is the preservation of reservoir properties of productive layers in the secondary their showdown at runtime capital and current repairs of wells and other geological and technical measures, as well as increasing the efficiency of exploration wells. In addition, the high content of magnesium chloride in an aqueous solution of salt (>93%) allows to prepare the kill fluid with a density range of 1.02-1.30 and 1.35 g/cm3that eliminates well with a large reservoir pressure and to carry out the temporary isolation of the pores of the formation. From the standpoint of achieving ecological rationality developed the recipe GGS contributes to the improvement of ecological purity of the materials used in capital and current repair of wells and reduction of harmful effects on reservoir properties of the formation.

Thus, using the proposed formulation GGS allows to improve the quality of jamming productive wells with anomalous pressure of 1.0 to 1.3 at the expense of the weight of the reservoir water magnesium chloride (primarily bischofite), without causing the formation of insoluble precipitates at the contact with formation water of any salinity and composition; - to increase the efficiency of development of productive wells after killing by reducing the amount of filtering GGS into the reservoir up to 8 cm3for 30 minutes, due to the introduction of g - PAA average anionic activity with high molecular weight and filler (chalk), p is after killing by reducing surface tension at the border GIGS with a hydrocarbon medium (oil) to 6.2N/m and swelling of clay minerals, due to the introduction of surfactant complex action.


Claims

1. Fluid for plugging wells comprising a dispersion medium solution of magnesium chloride, diluted formation water applier well kill fluid, dispersed phase, the reagent fluid filter thickeners and surfactants surfactant, wherein the solution of magnesium chloride contains more than 93% MgCI2as the dispersed phase using chalk as a thickener - polyacrylamide PAA brand PRAESTOL 2530-2640, as surfactant - surfactant complex action snpch PKD-0515 in the following ratio, wt. %:
The specified magnesium chloride - 8-30
Chalk - 0-10
Specified PAA - 0,01-0,2
Surfactant complex action snpch PKD-0515 - a 0.01 to 3.0
The specified water - the Rest
2. Fluid under item 1, characterized in that, as specified solution of magnesium chloride it contains bischofite.

 

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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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