The method of processing bottom-hole zone of the well

 

(57) Abstract:

The invention relates to the oil industry, in particular to methods for processing bottom-hole zone of the production well or wells, translated in the discharge of mining, which is complicated by the loss of asphaltoresinparaffin substances (ASPO) in the wellbore area. The technical result of the invention is to increase the efficiency of cleaning the pores of the reservoir bottom hole zone of the well from ASPO and increase as a result of this performance, due to the almost complete dissolution and removal of sediment from the bottom-hole zone of the well. In the method of processing bottom-hole zone of the well, comprising pumping into the bottom zone of the composition of the hydrocarbon solvent and surfactants surfactants and technological holding, as specified composition using the surfactant solution - REKOD-758 in hydrocarbon solvent distillation residues of ethylbenzene or surfactant solution - neonols AF9-12the hydrocarbon solvent is a mixture of by-products of the production of monomers for synthetic rubber, and also before the injection of the indicated composition is administered distillate, the treatment is carried out in two stages, CH,0, the specified surfactant 0.25 to 0.6 distillate else, carry out technological extract 1 - 3 hours, then pumped the second composition in the following ratio, wt.%: the specified solvent 40,0 - 60,0 specified surfactant 0.25 to 0.6 distillate rest and carry out technological restraint 20 - 24 hours. table 4.

The invention relates to the oil industry, in particular to methods for processing bottom-hole zone of the production well or wells, translated in the discharge of mining, which is complicated by the loss of asphaltoresinparaffin substances (ASPO) in the wellbore area.

A method of processing bottom-hole zone of the well, comprising pumping into the bottom zone of 0.2 to 10.0% solution of the condensation product of tertiary amine with benzyl chloride in saline water mixed with 6-24% aqueous solution of hydrochloric acid (see U.S. Pat. RU # 2065032, CL E 21 In 43/22, publ. BI No. 22 of 10.08.96,].

As a result of application of the method increases the flow rate by reducing the interfacial tension at the interface of the displacing agent of oil.

The disadvantage of this method is the low efficiency of treatment of bottom-hole zone of the well from asphaltoresinparaffin wishes Aut on its operating parameters, what used to be the way the reagents are effective solvents for paraffin.

Closest to the proposed to the technical essence and the achieved result is a method of processing bottom-hole zone of the well, comprising pumping into the bottom zone of the composition of the hydrocarbon solvent and surfactants surfactants and technological exposure [see Reference “Chemical reagents in the extraction and transport of oil, Rakhmankulov D. L. et al. M, Chemistry, 1987, S. 72-89.].

A method of processing bottom-hole zone of the well is carried out in the following sequence.

Chosen well, which in operation has decreased process (the flow rate of the liquid and oil), hydrodynamic (downhole pressure and dynamic fluid level) parameters, as well as deteriorated performance of the pump (by reading dynamogeny). Descend into the well tubing with the pen to the bottom of the processed layer. Then produce the injection of the composition of the hydrocarbon solvent and surfactant surfactant in the tubing, bring it to the reservoir and carry out the displacement in the reservoir anhydrous oil. Close valves and leave the well under pressure for 24 hours on Yoda can improve the flow of the well fluid and oil due to partial dissolution of deposits in the wellbore area and improve due to this filtration properties of the porous medium for oil.

However, the way allows you to clean from ASPO only part of the pore volume of the reservoir bottom hole zone of the well. As shown by laboratory studies, the effects of the composition of the hydrocarbon solvent and surfactant surfactant on ASPO maximum can be dissolved only 56% and 26% of the sediment is dispersed, i.e., is a mechanical destruction of deposits with a strongly developed surface of many small solid particles that are capable of collaterality pores of the reservoir bottom hole zone of the well. Surfactant included in the composition, increases the surface activity of the solvent and the effect of dispersion of paraffin. As a result, the cleaning efficiency of bottom-hole zone of the well is reduced.

Solved the technical problem is that you need to create this method of processing bottom-hole zone of the well, which would provide the maximum possible the process of cleaning the pores of the reservoir bottom hole zone of the well from ASPO.

The technical task of the invention is to increase the efficiency of cleaning the pores of the reservoir bottom hole zone of the well from ASPO and increased its productivity due to the almost complete dissolution and removal Sabinas zone wells including injection into the bottom zone of the composition of the hydrocarbon solvent and surfactants surfactants and technological restraint.

What's new is that as specified composition using the surfactant solution - REKOD-758 in hydrocarbon solvent distillation residues of ethylbenzene or surfactant solution - neonols AF9-12the hydrocarbon solvent is a mixture of by-products of the production of monomers for synthetic rubber, and also before the injection of the indicated composition is administered distillate, the treatment is carried out in two stages, first upload the first song in the following ratio, wt.%:

The specified solvent 4,0-8,0

The specified surfactant 0,25-0,6

The distillate Else

carry out technological extract 1-3 hours, then pumped the second composition in the following ratio, wt.%:

The specified solvent 40,0-60,0

The specified surfactant 0,25-0,6

The distillate Else

and implement technological exposure 20-24 hours.

The method is carried out in the following sequence. On oil fields choose the well, which is complicated by the sediments of asphaltoresinparaffin the STI, decreased dynamic level and bottom-hole pressure. From wells extract groundwater equipment and tubing down with a feather to the bottom of the processed layer. In advance in capacity-mixers are preparing the first composition in the following sequence at a certain ratio of components: first dissolve the surfactant in the hydrocarbon solvent, and optionally before download the song introducing the distillate. The optimal concentration of the hydrocarbon solvent is determined from the experimental data presented in table.1, from which it is clear that she is 4.0 to 8.0 wt.%.

The optimum concentration of surfactant is determined from experimental data, are given in table.2, from which it follows that it is 0.25 to 0.6 wt.%. At concentrations below 0.25 and above 0.6 wt.% reduced solvent and dispersing ability of the composition.

Next, have pumped prepared the first song in the bottom zone of the well, where it was incubated for 1-3 hours. When conducting laboratory experiments, it was observed (visually) that within 1-3 hours is the total destruction of large agglomerates of deposits into smaller, which contributes naibolee in the bottom zone of the well pump, the second composition, prepared in the same manner as the first, only with different ratios of components. As can be seen from the experimental data given in table.3, the second composition has better solvent properties at a concentration in it of hydrocarbon solvent 40,0 60,0 wt.%.

Well leave under pressure for 20-24 hours. During this period of maximum dissolution ARPD (see tab. 4). After technological extracts wash away the reaction products, descend underground equipment and run well.

As the hydrocarbon solvent take the distillation residues of ethylbenzene (TU 2414-033-05766801-95) or a mixture of by-products of the production of monomers for synthetic rubber production (TU 2411-036-05766801-95).

As surface-active substances are used REKOD-758 or neonol AF9-12.

REKOD-758 is a solution of nonionic surfactant (with a mass fraction 505%) in methanol. REKOD-758 produced according to TU 9512-002-48680808 OP 98, and is a homogeneous transparent liquid colorless to light brown color with a density 870-950 kg/m3, viscosity 30-60 mm2/s (at 20 ° C) and pour point not higher than minus 50C.

Neonol AFetilenglikolevykh esters of monoalkylphenols with a degree of oksietilirovannye 12. Neonol AF9-12produced according to TU 2483-077-05766801-98 and relates to water-soluble nonionic surfactants, but soluble in some organic solvents, including petroleum. Neonol AF9-12transparent oily liquid colorless to light yellow color with a density at 50 ° C 10463 kg/m3having a pour point 13-17C.

As a result of application of the proposed method the following processes occur.

It is known that the addition of surfactants for hydrocarbon solvent facilitates its penetration into the pores of the reservoir bottom hole zone of the well by lowering the surface tension at the phase boundary and improve the wettability of rocks hydrocarbon solvent. The effect of the first songs on the deposits within 3 hours leads to the destruction of their small, unconnected, particles with a strongly developed surface with simultaneous partial dissolution. Subsequent injection of the second composition having improved solubility, leading to full cleans pores of the reservoir from asphaltoresinparaffin substances. After washing the reaction products improved reservoir properties wellbore zones is Yan, which ultimately leads to increased productivity of the well.

Examples of specific performance.

For experimental verification of the effectiveness of the proposed method described specific examples of its implementation.

Feel dissolving and dispersing ability of the compositions according to the proposed method according to the methodology developed Discloses. To test take asphaltoresinparaffin deposits from well No. 1855 South Romashkinskoye square of the following composition, wt.%: asphaltenes - 13,8; resin - 34,2; paraffin - 44,0; mechanical impurities - 3,2; water and salt - to 4.8. A sample of deposits in the amount of 1 g was placed in a basket made of metal mesh with a cell size of 1,51,5 mm and incubated for 30 g of the composition for 3 hours at a certain temperature. Dissolving and dispersing ability is determined by the weight loss of the sample ARPD in wt.%.

Example 1 (prototype). A sample of deposits in the amount of 1 g immersed in 30 g of the composition of the hydrocarbon solvent (gasoline gas in the number 29,91 g) and surfactant (afterstory surfactant in the amount of 0.09 g). Prepared composition has the following ratio of components, wt.%: gasoline gas - 99,7; surfactant is 0.3. Through the trials are given in table. 4 (p. 1).

Example 2 (first composition). Composition is prepared: mix 0.09 g of surfactant REKOD-758 with 2 g of the cubic residue of ethylbenzene, in addition to the specified composition is administered 30 g of distillate. Prepared composition has the following ratio of components, wt.%: VAT residue of ethylbenzene - 6,23; surfactant - 0,28; distillate - 93,49. In the thus prepared composition was placed 1 g of sediment. From time to time determine dissolving and dispersing ability. The test results are given in table.4 (p. 2), from which it is clear that 3 hours is the maximum dispersion of paraffin. When increasing the exposure time of sediment in the composition up to 24 hours leads to the dissolution of the dispersed particles, but the total effect is 85 wt.% (50% is dissolved fat and 35% in dispergirovannom)

Example 3 (proposed). Composition is prepared: mix 0.09 g of surfactant REKOD-758 with 2 g of the cubic residue of ethylbenzene, in addition to the specified composition is administered 30 g of distillate. Prepared composition has the following ratio of components, wt.%: VAT residue of ethylbenzene nd 3 hours during this time, the maximum possible for a given composition the percent dispersion of paraffin (see tab. 1, p. 2). Then the first composition is replaced with a second composition is prepared as follows: 15 g of the cubic residue of ethylbenzene dissolve 0.09 g of surfactant REKOD-758 and additionally in the specified composition is administered 15 g of distillate, while the second composition has the following ratio of components, wt.%: VAT residue of ethylbenzene - 49,85; surfactant - 0,3; distillate - 49,85. From time to time determine dissolving ability. The test results are given in table.4, p. 3.

Example 4 (proposed). Performed as example 3 except that as the surfactant used AF9-12, and as the hydrocarbon solvent is a mixture of by-products of the production of monomers for synthetic rubber. The test results are given in table.4, p. 4.

The table shows that the processing of paraffin compositions in two stages allows to increase the solubility of sediment as a result of processing the first composition in a dispersed for 3 hours 57% and dissolves 24% of the sediments, and the subsequent processing of the second composition is dissolved 96-97 wt.%. Thus PR is ing its effectiveness by 40%. Almost complete removal of deposits from the pores of the bottom zone of the well provides oil flow to her face and thereby increases the productivity of the well. The method allows also to increase their functionality by expanding the range used as the hydrocarbon solvents cheap waste petrochemical production (bottoms of ethylbenzene and a mixture of by-products of the production of monomers for synthetic rubber).

Technical and economic efficiency of the proposed method of treatment of bottom-hole zone of the well is formed by increasing oil production and reduce material costs in hydrocarbon solvents.

The method of processing bottom-hole zone of the well, comprising pumping into the bottom zone of the composition of the hydrocarbon solvent and surface-active substances (surfactants) and technological holding, characterized in that, as specified composition using the surfactant solution - REKOD-758 in hydrocarbon solvent distillation residues of ethylbenzene or surfactant solution is neonol AF9-12the hydrocarbon solvent is a mixture of by-products of the production of synthetic monomers have Kucukyali upload the first song in the following ratio of components, wt.%:

The specified solvent 4,0 - 8,0

The specified surfactant 0,25 - 0,6

The distillate Else

carry out technological shutter speed 1 to 3 hours, then pumped the second composition in the following ratio, wt.%:

The specified solvent 40,0 - 60,0

The specified surfactant 0,25 - 0,6

The distillate Else

and implement technological restraint 20 - 24 hours

 

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FIELD: oil and gas production.

SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

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