Solid foamable composition for removing liquid from the wells and method thereof

 

(57) Abstract:

The invention relates to oil and gas industry and can be used, in particular, to remove the saline formation water and their mixtures with condensate from stripper gas and gas condensate wells. Solid foamable composition for removing liquid from the gas and gas condensate wells contains powder Foundation kssb, surfactants, based on the alkylphenol, plasticizing and facilitate supplements. As a plasticizing additive composition contains ammonium tartrate. As to facilitate the additive composition contains sodium carbonate. The ratio of sodium carbonate and ammonium tartrate is 1:1-1:25 when the common ratio of components, wt.%: powder Foundation kssb 39 - 49, surfactant surfactant based on the alkylphenol 50 - 60, ammonium tartrate 0.5 to 0.95, and the sodium carbonate of 0.05 - 0.5. A method of obtaining a solid foamable composition includes mixing in the mixer until a homogeneous composition containing a powder Foundation kssb, surfactant surfactant based on the alkylphenol, plasticizing and facilitate additives and formation of the cores of the addition. Heated to a temperature higher than the melting point of this substance, stopping stirring. Add powdered Foundation kssb. Mix until a homogeneous mass. Then add plasticizing and facilitate supplements. The formation of rods carried out after heating the composition to a temperature at which produces gas. Pour the mixture into the mold and utverjdayut her when cooled. Technical result: the effective removal of saline formation waters and their mixtures with natural gas liquids from wells. 2 S. p. f-crystals, 1 table.

The invention relates to oil and gas industry and can be used, in particular, to remove the saline formation water and their mixtures with condensate from stripper gas and gas condensate wells.

Known composition for removing liquid from the gas and gas condensate wells containing powdered base (kssb), surface-active substances, based on the alkylphenol, plasticizing and facilitate supplements [SU, ed. mon. N 1710705, IPC E 21 B 43/00 from 04.08.89,].

The disadvantage of this composition is that it only deletes the condensation and desalinated produced water from the wells irrigate saline formation waters, containing up to 2000-3000 mg-EQ./l or more of dissolved salts, to remove this part is not intended. In addition, the composition has a relatively high dissolution rate, which is about 17-23 g per hour at room temperature. This leads to the formation of a supersaturated solution of surface-active substances (surfactants) in a short period of time with subsequent volley release of almost all of the reagent from the first portions of the removed liquid, while the main volume without surfactant remains in the well. This leads to the need for frequent repetition of the operations of surfactants, even with the removal of desalinated water, which increases the process and increases its complexity.

A method of obtaining solid foamable composition, comprising mixing in a mixer until a homogeneous composition containing powder Foundation - condensed sulfite-alcohol bard (kssb), surfactant surfactant based on the alkylphenol, plasticizing and facilitate additives, and the formation of the cores from this mass [SU, ed. mon. N 1710705, IPC E 21 B 43/00 from 04.08.89,].

The disadvantage of this method is the low efficiency of removal of highly mineralized water is enta, which in the presence of calcium ions and magnesium forms a water-insoluble calcium and magnesium Soaps, which dramatically affects the foaming and reduce the concentration of surfactants in the aquatic environment.

The task of the invention is to increase the efficiency of removal of saline formation waters and their mixtures with natural gas liquids from wells.

The problem is solved due to the fact that solid foamable composition for removing liquid from the gas and gas condensate wells containing powder Foundation kssb, surfactants, based on the alkylphenol, plasticizing and facilitate supplements, as plasticizing agents contains ammonium tartrate as facilitating the additive contains sodium carbonate in a ratio of components, wt.%: powder Foundation kssb 39-49, surfactant surfactant 50-60, ammonium tartrate 0.5 to 0.95, and the sodium carbonate of 0.05-0.5. The assigned task is also due to the fact that the method of obtaining a solid foamable composition, comprising mixing in a mixer until a homogeneous composition containing a powder Foundation kssb, surfactant surfactant based unprevailing crushed surface-active substance based on alkylphenol, heated to a temperature higher than the melting point of this substance, without stirring, add the powdered base kssb and mix until smooth, then add plasticizing and facilitate additives, and the formation of rods carried out after heating the composition to a temperature at which it is divided gas, pour the mixture into the mold and utverjdayut her under refrigeration.

The application of a mixture of ammonium tartrate and sodium carbonate enables the formation of microacoustic porous structure of the composition in the process of making cores. With this technology the rods provide a microporous structure with a closed type long is not permeable to saturate the cores fluid at an ambient pressure to 10 MPa, and more.

When the content kssb in the composition of less than 39% of the density of the foam composition is higher than the density of the brine, so the rods of such composition will sink to remove the liquid. When the content kssb more than 49% of the foaming ability of the composition deteriorates, complicated process of making cores due to excessive increase in melt viscosity of the proposed structure. When the content of surfactant in the composition is less than 50% of CH is I have a nonuniform loose structure. When the content of surfactant in the composition of more than 60% of the density of rods is higher than the density of the removed liquid.

The use of ammonium tartrate and sodium carbonate contributes to the formation of microacoustic porous structure of the solid foaming composition. Therefore, the content of ammonium tartrate (0.5 to 0.95 percent) and sodium carbonate (0,05-0,5%) above or below specified ratios complicates formation of microacoustic porous structure.

Surfactant based on alkylphenol surfactants) before loading in a thermostatic mixer is crushed to pieces or shavings (to accelerate melting), and then heated in the mixer to the melting temperature (43-45oC) or slightly higher. After melting all surfactants include the stirrer and stopping stirring, gradually add powdered Foundation kssb. Continuous stirring is necessary to prevent clumping kssb in the composition. Then (after pre-mixing between a) enter the additives. This sequence of input components is achieved most homogeneous distribution in the volume of the composition obtained for forming rods.

Forming rods only after the evolution of gas required to provide Orlovka rods after the start of gas production and rapid solidification by cooling required to prevent release of gas from the volume of the composition in the free phase. Only when such a sequence of operations and at the maximum short duration of curing the formed rods are fine porous structure of the closed type due to the entrapment of gas bubbles in the whole volume.

The method is as follows. In thermally screw mixer load, for example, 60% (0.75 g) shredded surfactant, the mixer is heated to the melting point of the surfactant (43-45oC or slightly higher). And then, with continuous stirring, gradually add 39% kssb (0,4875 g). Mixing of the components to produce a homogeneous mass within 5-7 minutes, then stopping stirring, add a mixture of 0.05% (0,000625 g), sodium carbonate (facilitating additive) and 0.95% (0,011875 g), ammonium tartrate (plasticizing additive). The resulting mass is heated up to 65-68oC and after gas evolution form rods, pouring the mixture into the mold and otorita her under refrigeration.

To evaluate the effectiveness of removal of the liquid cooked rod density 995 kg/m3enter in the model wellbore filled with a fluid with a salinity higher than 2000 mg-EQ./l or more of dissolved salts and containing 50% of gas condensate. The dissolution rate based fluid for 30 min ozonation gas through the model of the well is 50 ml, and the degree of removal of the liquid at the same time amounted to 20%.

The composition and results of the solid foaming composition shown in table 1.

Specific examples of the foaming composition shown in the table, cover the ultimate, and the ultimate ratio of components.

Solid foamable composition has a density within 855-1010 kg/m3depending on the ratio of components, and the density of the composition is lower than the density of the deleted saline formation waters, the density of which more than 1100 kg/m3. Due to the slow solubility of the composition and a low rate of diffusion of the surfactant molecules in the opposite direction to the gas flow, dissolution, composition and saturation of the liquid foaming agent to the minimum necessary for foaming concentration occurs in a limited volume of liquid near the upper boundary of the "liquid-gas", and then foaming and carryover of this volume from the well. Lowering the concentration of foaming agent remaining in the fluid layer is compensated by further dilution with subsequent removal of the next microvolume liquid and so on, until complete removal of the liquid or the practical solution is to remove the saline formation water and their mixtures of gas and gas condensate wells and has a high dissolution rate. When using this composition in the wells with highly mineralized formation water removal liquid is extremely difficult. The inventive solid foamable composition is suitable for removal of saline formation waters. The rods are formed of the proposed team have a density lower than the density of the removed formation waters. The proposed structure has a slower rate of dissolution, which is 1.3 to 2.5 g per hour, which also affects the removal of liquid from the wells. The table shows that the removal of the liquid with the application of the proposed solid foamable composition reaches more than 70%, and in the presence of gas condensate removal is reduced and is 29-30%, while the composition of the closest technical solution in such conditions does not work. Therefore, the proposed structure may be used to remove saline water from the gas and gas condensate wells.

1. Solid foamable composition for removing liquid from the gas and gas condensate wells containing powder Foundation kssb, surfactants, based on the alkylphenol, plasticizing and facilitate additives, characterized in that as a plasticizing additive composition content is.%:

Powder Foundation kssb - 39 - 49

Surfactant surfactant based on the alkylphenol - 50 - 60

The ammonium tartrate and 0.5 - 0,95

Sodium carbonate - 0,05 - 0,5

2. A method of obtaining a solid foamable composition, comprising mixing in a mixer until a homogeneous composition containing a powder Foundation kssb, surfactant surfactant based on the alkylphenol, plasticizing and facilitate additives, the formation of the cores from this mass, characterized in that the stirrer is loaded preliminary ground surface-active substance based on alkylphenol, is heated to a temperature higher than the melting point of this substance, without stirring, add the powdered base kssb and mix until smooth, then add plasticizing and facilitate additives, and the formation of rods carried out after heating the composition to a temperature in which stands out the gas, pour the mixture into the mold and utverjdayut her when cooled.

 

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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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