Method of increasing the productivity of wells

 

(57) Abstract:

The invention relates to the oil industry and can be used to restore and enhance productivity in water-cut oil wells, bottom-hole zone and oilfield equipment which is locked asphalt, resin and paraffin deposits. Method of increasing the productivity of wells includes a download to the PPP, the displacement and restraint in the formation of a reagent-solvent and removing the products of dissolution and dispersion of the reservoir, characterized in that, as a reagent, a solvent used emulsion containing nonionic surfactants - sintana ALM-10 or ALM-2 or OS-20, a hydrocarbon solvent and water in a mass ratio of 0.06:1:1, before pumping it into the reservoir handle emulsion by using a circular circulation pipes, pump and downhole equipment, after removal of the products of dissolution and dispersion of the reservoir spend processing bottom-hole zone of a suspension in a hydrocarbon solvent chemically modified on the surface of highly dispersed silicon oxide white carbon black, silica dust or silica clay with the degree of hydrophobicity 96,0-98,0%. As the hydrocarbon solvent ispolzuite: efficient removal of paraffin deposits and the creation of a hydrophobized zone formation in flooded wells. 1 C.p. f-crystals, 2 tab.

The invention relates to the oil industry and can be used to improve productivity in irrigated wells, bottom-hole zone and oilfield equipment which is locked asphalt, resin and paraffin deposits (ARPD).

A known method of removing paraffin deposition in oil wells and the bottomhole formation zone (PPP) by injection into the impact zone water emulsions containing surfactants. For these purposes a reagent RT-1 [surfactant (sulfonic acids) in aromatic solvent] as 5-20% water emulsion or with a hydrocarbon solvent in the amount of 0.5-20% (RU patent 2115799, CL E 21 In 37/06, 1998).

This processing is not complex nature and the method does not effectively remove the deposits. In the presence of chronic sediment in the borehole clearance from them must be performed using undiluted 100% reagent RT-1, which leads to higher well-transactions.

Known a number of complex ways in which the removal of sediment from the well bottom-hole formation zone is combined, for example, with acid treatment (RU patent, 2103477, CL E 21 In 37/00, 1998). This method is two-stage. First, processing of the PPP by Zack Hemingway acid in the formation water.

The method involves the use of expensive and toxic kalogeropoulou that cause serious complications for further refining, as poisons for catalysts for petrochemical plants. In addition, chlorofluorocarbons Smoking Programme United Nations environment programme (UNEP) for wide applications, such as chemicals destroying the ozone layer of the Earth. The production of these reagents in the coming years will be completely stopped.

Closest to the invention is a method of increasing the productivity of producing and injection wells to seal off and paved the bottomhole zone of the formation and the wellbore (RU patent 2030571, CL E 21 In 43/02, 1995).

The method comprises the injection into the well of an organic solvent, its displacement in the reservoir, the shutter speed in the reservoir and removing the reaction products from the reservoir at the start of the well, and as the solvent used solutions of rocket fuel with quinoline or its derivatives and/or processing products of phytosterol, or soap sulfate ennobled.

As rocket fuel used hydrazinehydrate and hydrochloric acid hydrazinehydrate in net wilthout to protect wells from acid-hydrogen sulfide corrosion and hydrogen absorption.

The disadvantage of this method is the use of "exotic" for the oil industry reagents: hydrazine hydrate is added, hydrochloric acid hydrazine hydrate is added, quinoline and its derivatives. These substances with high donor properties adversely affect the quality of oil, make it unsuitable for catalytic conversion processes, blocking acceptor centers of catalysts based on transition metals. In addition, this method does not allow to quickly and effectively remove asphalt, resin and paraffin deposits, will not increase the productivity of irrigated wells.

The objective of the invention is to create a comprehensive way of increasing the productivity of wells by three-stage processing: purification of downhole equipment, processing bottom-hole formation zone, providing efficient removal of paraffin deposits and the creation of a hydrophobized zone formation in flooded wells.

The problem is solved in that in the method of increasing the productivity of wells, including injection into the PPP, the displacement and restraint in the formation of a reagent-solvent and removing the products of dissolution and dispersion of the reservoir, as a reagent, a solvent is used emulsione 0,06: 1:1, before pumping it into the reservoir, handle emulsion, using a circular circulation, pipes, tubing and downhole equipment, and after removal of the products of dissolution and dispersion of the reservoir spend processing bottom-hole zone of a suspension in a hydrocarbon solvent chemically modified on the surface of highly dispersed silicon oxide white carbon black, silica dust or silica clay with the degree of hydrophobicity 96,0-98,0%.

The hydrocarbon solvent used wide fraction of light hydrocarbons, condensate, kerosene, naphtha or diesel fuel.

The method is as follows. At the first stage of processing is carried out cleaning of the pipes, pump and downhole equipment with circular circulation of reagent-solvent according to the following scheme: pump-mouth - annulus - tubing pump. As a reagent solvent used water emulsion containing nonionic surfactants-fatty alcohol ethoxylates ALM-10 (ALM-2, OS-20) and the hydrocarbon solvent (NGL, condensate, kerosene, naphtha or diesel fuel).

In the second stage, carry out the injection of the above emulsion in the PPP, the shutter speed in the formation and destruction of products restoration-water-repellent powder with a content of from 0.5 to 2.5 wt.% in an organic solvent in an amount of from 0.5 to 3.0 m3for every meter effective area of the power layer. As a powder using a chemically modified on the surface of the superfine material is a variety of silica (white carbon, silica dust or flask) with the degree of hydrophobicity 96,0-98,0%.

As the hydrocarbon solvent at all stages of processing, use one of the following solvents: NGL, condensate, gasoline, kerosene, naphtha, diesel fuel. At each stage can be used as the same or different solvents of the above.

Comprehensive treatment allows to increase the productivity of wells, to give the pores and channels of the PPP water-repellent properties, which contribute to the reduction of water content in Neftepolis.

Emulsion, due to the high penetrating ability in water-saturated layer, can effectively remove the deposits from the bottom zone selenoorganic fields.

Depending on the parameters of the hydrophobic processing mode of a General increase in permeability and the mode of election of improving the filtration of oil with water cutoff. The first mode is applicable to increase responsiveness and reduce the pressure h is s unprofitable wells.

The efficiency of emulsions as reagents, solvents, paraffin in the bottom layer were investigated on model core samples, locked asphalt, resin and paraffin deposits.

The methodology of the study was to identify on models of the formation of the reduction degree of the permeability of the rock collector under the influence of reagents and solvents to the blockade ARPD. The reservoir simulation and in-situ processes in the PPP when handling reagents was carried out on the basis of the similarity of the reservoir, including both geometric and physico-chemical and reservoir criteria.

Were selected the following model conditions: lithology is Sandstone, reservoir temperature - 60oWith; the length of the model l-45,5 cm; porosity rocks m-0,120,25; the permeability of the rock to - 0,0100,550 μm2; the filtration rate of water (oil) on the reservoir model - wM0,010,50 cm/s; the filtration rate of the reagent in the reservoir model wM-0,050,50 cm/s

Studies in laboratory scale were carried out on the linear reservoir model with a diameter of d=30.0 mm, the cross-sectional area F=0,065 cm2and length lM= 5,0 see the Sample was subjected to saturation of the reservoir water is th water and neftepromremont. The formation of the blockade was carried out high-viscosity paraffin oil. The results of the study are presented in table.1.

Replacing kerosene with other hydrocarbon solvents did not modify the results of experiments on the processing of core materials, blocked ARPD.

The efficiency of hydrophobic substances for bottomhole zone treatment was studied on the model core samples. The methodology of the study and the model conditions were similar to the above to examine the effectiveness of reagents and solvents. The experiments allowed to determine the initial permeability of the samples and that the samples treated with a suspension of a hydrophobic substance is chemically modified on the surface of the superfine material, a form of silicon oxide (silica clay) with the degree of hydrophobicity 96,0%.

The results of the study are presented in table.2.

Use as hydrophobic substances chemically modified on the surface of highly dispersed materials - types of silica (white carbon black or silica dust) did not lead to significant changes in the experiments to reduce permeability model placementof processing core material suspension of hydrophobic substances.

1. Method of increasing the productivity of wells, including injection into the PPP, the displacement and restraint in the formation of a reagent-solvent and removing the products of dissolution and dispersion of the reservoir, characterized in that, as a reagent, a solvent used emulsion containing nonionic surfactants - sintana ALM-10, or ALM-2 or OS-20, a hydrocarbon solvent and water in a mass ratio of 0.06: 1: 1, before pumping it into the reservoir handle emulsion, using a circular circulation, pipes, tubing and downhole equipment, after removal of the products of dissolution and dispersion of the reservoir, spend processing bottom-hole zone of a suspension in a hydrocarbon solvent chemically modified on the surface of highly dispersed silicon oxide white carbon black, silica dust or silica clay with the degree of hydrophobicity 96,0-98,0%.

2. The method according to p. 1, characterized in that the hydrocarbon solvent used NGL, condensate, kerosene, naphtha or diesel fuel.

 

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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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