RU2363836C2 - Procedure for lifting liquid from bottomhole of gas condensate wells with low gas factor under conditions of abnormally low reservoir pressure - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: invention refers to production of oil, gas and gas (hydrocarbon) condensate, particularly to process of lifting liquid from gas condensate deposits with low gas factor under conditions of abnormally low reservoir pressure. According to the procedure of lifting liquid from bottomhole of gas condensate wells with low gas factor under conditions of abnormally low reservoir pressure by means of liquid and solid foaming agents the well is treated by separate simultaneous effect onto two zones of treatment with two types of surface active substances: liquid surface active substances are supplied into annular space and solid active substances are supplied into tubing string of the well.

EFFECT: facilitating efficient lifting of reservoir hydrocarbon containing liquid from gas condensate wells with low gas factor under conditions of low and abnormally low pressure in pay reservoirs.

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Description

The invention relates to the field of oil, gas, and gas (hydrocarbon) condensate production, and in particular to a technology for raising liquid from wells of gas condensate fields with a low gas factor under conditions of abnormally low reservoir pressures.

There is a method of introducing a surfactant — a foaming agent — into the annulus of a well in the form of solutions of various concentrations (1) (Temporary instructions for removing fluid from gas and gas condensate wells using foaming agents. Stavropol: SevKavNIIgaz, 1977, p.17). The introduction of a liquid foaming agent into the well may be continuous or intermittent. The continuous supply of surfactant is carried out by gravity from the tank or various pumping units are used. For periodic supply of liquid surfactants to the wells, cementing units CA-100 or CA-320 are used or the inhibitor unit UI-1 is used.

The closest in technical essence and the achieved result to the proposed method of lifting fluid from the bottom of gas condensate wells with a low gas factor under conditions of abnormally low reservoir pressures is a method of removing fluid from the bottom of wells using solid foaming agents (2) (ed. St. SU No. 1710705 , CL E21B 43/00; C09K 7/02, publ. 07.02. 1992, Bull. No. 5). In this case, the reagent is supplied into the tubes. To enter solid foaming agents into the well, a special device is used - a lubricator, which is installed on a buffer valve. Using this method simplifies the introduction of surfactants into the well and reduces the cost of one well operation.

The disadvantage of the above methods is that they can provide an effective lifting of liquid from wells in gas fields, gas condensate fields with a low daily flow of liquid to the bottom (100-300 l), with a hydrocarbon condensate content in the liquid formation fluid of up to 30% and with an anomaly coefficient of below 0.4. When operating wells under conditions of decreasing hydrocarbon production, at abnormally low values of fluid pressures in productive formations, the use of these methods for introducing surfactants into wells does not always efficiently provide fluid recovery.

A particularly difficult technical task is the forced lifting of fluid from wells of gas condensate fields with a high content of hydrocarbon condensate in the formation fluid. The hydrocarbon phase in the reservoir fluid of this category of production wells is a defoamer. The latter destroys the gas emulsion in the suspension of the tubing along the gradient "bottom - wellhead"; reduces the effectiveness of the rise until the well stops.

An object of the present invention is to provide an effective recovery of hydrocarbon-containing formation fluids from gas condensate wells with a low gas factor under conditions of low and abnormally low pressures in productive formations.

The essence of the present invention lies in the fact that the proposed method of lifting fluid from the bottom of gas condensate wells with a low gas factor under conditions of abnormally low reservoir pressures using liquid and solid foaming agents, characterized in that the well is treated separately by simultaneously treating two treatment zones with two types of surfactants: liquid surfactants into the annulus of the well and solid surfactants into t ubnoe space of a well that meets the criterion of "novelty".

The technical result in the implementation of this method of lifting reservoir fluids from gas condensate wells became possible due to the synergy effect established by the authors, i.e. the effect of enhancing the action of one surfactant (liquid surfactant) when using another surfactant (solid surfactant). In the proposed method, two zones of the well are processed: the annulus and the well filter, i.e. the zone of the most intensive bubbling of the gas-surfactant-formation fluid system, and also the fluid in the tubing is treated and removed. Our proposed technological method of processing a well allows for the most efficient removal of formation fluid from the well.

The results of field tests of the method are presented in the table.

Method Test Results №№ No. of wells Used surfactant The number of injected surfactants, units / l The volume of fluid in the well, l The removal of fluid from the well,% before processing after processing one. 69 ZhPAV 50 l 20% solution 700 600 fourteen TPAV 12 700 650 7 ZhPAV + TPAV 50 l of 10% solution and 4 units. 700 one hundred 85 2. 22 ZhPAV 50 l 20% solution 500 450 10 TPAV 9 500 450 10 ZhPAV + TPAV 50 l of 10% solution and 4 units. 500 150 70

The results of field tests indicate the high efficiency of the proposed method, expressed in improving the operating conditions of the wells. This makes it possible to stabilize and increase gas and condensate production and increase the efficiency of field development as a whole.

Claims (1)

The method of lifting liquid from the bottom of gas condensate wells with a low gas factor under conditions of abnormally low reservoir pressures using liquid and solid blowing agents, characterized in that the well is treated separately by simultaneously treating two treatment zones with two types of surfactants: liquid surfactants substances into the annulus and solid surfactants into the borehole space.