RU2337937C2 - Reagent for lifting of formation liquid from gas, gas condensate and oil wells with low gas factor under conditions of abnormal low formation pressure (alfp) - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to extraction of oil, gas and gas-hydrocarbon condensate, particularly to chemical reagents for lifting of liquid from wells of gas, gas-condensate, oil-gas-condensate deposits and wells of oil deposits with low gas factor. Sintanol "АЛМ-10" is used as a target reagent for lifting of formation liquid from gas, gas-condensate and oil wells with low gas factor under conditions of low and abnormal low pressures in producing formations within the range of hydrocarbon concentrations from 10 to 90% of vol.

EFFECT: facilitating efficient lifting of formation hydrocarbon containing liquid from said wells.

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Description

The present invention relates to the field of oil, gas and gas (hydrocarbon) condensate production, in particular to chemical reagents for lifting liquids from gas field wells (GM), gas condensate fields (HCM), oil and gas condensate (NGC) and oil field wells (NM) with low gas factor.

Known reagent for the removal of formation fluid from the wells of gas fields. The reagent contains a surface-active substance (surfactant) - "Sulfonate powder", certified, is produced according to TU 2481-237-05763458-98 (1) (Sulfonate powder. Specifications. 1988).

The disadvantage of this reagent is that when operating wells in conditions of decreasing production of hydrocarbon raw materials, at low and abnormally low values of fluid pressures in reservoirs (ANPD), when starting wells from the “stop” mode, the Sulfonate surfactant does not provide fluid rise from gas well.

A particularly difficult technical task is the forced lifting of fluids from gas and oil and gas condensate wells and oil wells with low gas factor. The hydrocarbon phase in the reservoir fluid of this category of production wells is a defoamer. The latter destroys the gas emulsion in the tubing suspension along the gradient “bottom-hole”; reduces the effectiveness of the rise until the well stops.

A known reagent is a solid foaming agent for removing liquid from the bottom of wells based on non-ionic surfactants OP-10, OP-7, anionic sulfonol and powdered lignosulfonate (2) (patent RU No. 2223298, class C09K 7/08, EV 21/14). However, the scope of this reagent does not apply to GM wells under the conditions of oil production, wells whose production is hydrocarbon condensate with a low initial boiling point, and wells whose production is oil.

The aim of the present invention is to provide an effective recovery of hydrocarbon-containing formation fluids from gas, gas condensate and oil wells with a low gas factor at low and abnormally low pressures in productive formations using the technology of using the target surfactant.

This goal is achieved by the use of a liquid surfactant based on the well-known Syntanol ALM-10 for the first time as a target reagent for raising formation fluids from wells, which meets the criterion of "novelty."

Syntanol ALM-10 is a mixture of polyoxyethylene glycol esters of synthetic primary higher fatty alcohols fraction C ₁₂ -C ₁₄ .

Sintanol ALM-10 is certified, is produced according to the technical specifications TU 6-14-864-88 and is used as an effective surfactant in the production of synthetic detergents (3) (TU-6-14-864-88. Sintanol ALM-10 . Technical requirements).

Syntanol ALM-10 is a paste from white to slightly yellow in color with an indicator of hydrogen ion activity (pH) in the range 6.0-9.0, mass fraction of hydroxyethyl groups 66 ± 3%. The cloud point of the aqueous solution of the drug with a mass fraction of the main substance of 1% in the range 84-92 ° C.

Syntanol ALM-10 is a moderately hazardous substance, the 3rd hazard class according to GOST 12.1.007, belongs to the group of biologically “soft” products with biodegradability of 85 ± 2%.

The use of the well-known Sintanol ALM-10 for lifting formation fluids from wells was made possible due to the effect of foaming hydrocarbon-containing fluids with the use of Sintanol ALM-10 aqueous solutions established by the authors.

It has been proved by research and analog test tests to adapt the Sintanol ALM-10 surfactant to the operating conditions of the wells:

1. ALM-10 syntanol has shown consistently reproducible results on the effective foaming of low boiling liquid hydrocarbons and oils, weakly mineralized waters (condensation water), mineralized associated formation water from gas and gas condensate wells, oil emulsions from elevators of oil wells with a low gas factor and formation fluids gas condensate wells (produced water - hydrocarbon condensate) in the range of hydrocarbon concentrations from 10 to 90 vol.%;

2. The method of application of Syntanol ALM-10 in the well is a working fluid, a nonionic liquid surfactant in the form of a 20% aqueous solution. The concentration of surfactants in the reservoir fluid is up to 2%, the volume of supply of the working fluid into the annulus of the well is from 50 to 100 liters per well-surfactant injection operation. The test results are summarized in table.

The data in the table indicate the high efficiency of the liquid nonionic surfactant based on Syntanol ALM-10. The use of Syntanol ALM-10 provides the highest degree of foaming of hydrocarbon-containing formation fluids with the formation of spontaneously destroyed so-called "short-lived" hydrocarbon-water emulsions.

The use of the well-known Syntanol ALM-10 as a target reagent for raising formation fluids from wells will improve the operating conditions of the wells, stabilize and obtain additional oil, gas and condensate production, increase the capital productivity of the wells and the efficiency of field development by reducing the cost of well operations, eliminating blowdowns and pumping and minimizing the cost of hydrocarbon production.

Test results No. p / p Test Surfactant The composition of the reservoir fluid - the object of study The concentration of surfactants in the reservoir fluid,% Measurement results The multiplicity of foaming, K The density of the foamed liquid, ρ, g / cm ³ , the nature of the regime of removal one 2 3 four 5 6 one Sulfonate powder PPV: UVK = 90: 10 vol.%, Well. No. 1 of the Nekrasovsky GKM, mineralization: 18450 mg / dm ³ , ρ _UVK = 0.795 g / cm ³ , t _NK = + 64 ° С 2.0 1.10 0.90; inefficient process, insufficient foaming 2 Reagent according to patent No. 2223298 "-" 2.0 1,50 0.67; insufficient foaming, non-adapted surfactant 3 ZhPAV-NK "-" 2.0 2.00 0.50; remote mode four TPAV-S-3 "-" 2.0 3.20 0.31; remote mode, foam self-separation 5 C-ALM-10 PPV well No. 1 Nekrasovsky gas condensate field, phase 100% 2.0 5,0 0.20; remote regime on a liquid 6 C-ALM-10 PPV well No. 7 of the Anniversary GKM 2.0 5,0 0.20; remote mode for reservoir fluid 7 C-ALM-10 UVK: PPV = 80: 20 vol.%, Well No. 7 of the Anniversary GKM 2.0 1.30 0.70; foam separation 8 C-ALM-10 UVK: PPV = 50: 50 vol.%, Well. No. 7 of the Anniversary GKM 2.0 2.20 0.47; effective foaming, remote mode 9 C-ALM-10 UVK: PPV = 30: 70 vol.%, Well. No. 47 of Starominsky gas condensate field, ρвк = 0.69 g / cm ³ , t _НК = + 31 ° С 2.0 5,0 0.20; remote mode 10 Junior of Accent Ind. Inc. »USA "-" 2.0 3,5 0.30; rigid structured emulsion, non-adapted surfactant eleven C-ALM-10 oil: PPV = 25: 75 vol.%, well No. 104 Adagum 2.0 2.0 0.50; effective foaming, mobile emulsion 12 C-ALM-10 oil: water = 60: 40 vol.%, wells. No. 104 Adagum 2.0 1.80 0.57; effective foaming 13 C-ALM-10 oil: water = 90: 10 vol.%, wells No. 1263 Anastasievskaya, ρн = 0.88 g / cm ³ 2.0 1,60 0.60; effective foaming fourteen C-ALM-10 oil: water = 3 0:70 vol.%, wells. No. 1263 Anastasievskaya 2.0 2.0 0.50; effective foaming, mobile emulsion fifteen C-ALM-10 KV-PPV, phase 100%, Cl ^- = 13 g / dm ³ , borehole. No. 93 Kanevsko-Swan GM 0.5 5,0 0.50; effective foaming, remote mode

Claims (1)

The use of Syntanol ALM-10 as a target reagent for lifting formation fluids from gas, gas condensate and oil wells with a low gas factor at low and abnormally low pressures in reservoirs in the range of hydrocarbon concentrations from 10 to 90 vol.%.