SU853092A1 - Well-starting method - Google Patents

Description

in the near-abyssal zone of the reservoir of a foaming composition containing water and a foaming surfactant, keeping it in the -plast and drying, evacuating the flow of formation fluid by circulating in the borehole, including water, a frother and a gas phase with a gradual increase in the degree aeration 2.

The disadvantage of this method is the low removal efficiency of the colmatiruon1, its layer of material in the process of calling the formation fluid.

The purpose of the invention is to increase the removal efficiency of the clogging layer of the mother-ala in the process of invoking the inflow of the plastototal fluid.

This is achieved by the fact that in addition the foaming composition contains NaOH, NGL-11 and methanol, and the components are taken at the following quantitative ratio, weight. %:

Foaming surfactant1 -2

NaOH3-5

GKZH-111-3

Methanol20-30

Water.The rest.

In the proposed method, prior to initiating the flow of reservoir fluid from the reservoir into the bottomhole zone, a multi-component foam is injected through the tubing, which contains, in addition to the known components (gas phase, water, foaming agent), special peptides and hydrophobization of clogging substances, dehydration of the surface of loric channels.

In the call flow process, when the oil (gas) flows from the plastic into the well, clogging material and water are completely removed from the reservoir due to the physicochemical effects of the previously injected multi-component fluid.

It is proposed to use sodium hydroxide as a peptizer and dispersant, the effect of which is enhanced in combination with a surfactant serving as a frother.

The surfactant concentration is taken 5-10 times higher than in the known method, i.e., above the critical micelle concentration, since the micelles are capable of absorbing a certain amount of solid particles and heavy hydrocarbons due to solubilization, which contributes to a better bottomhole cleaning. As a blowing agent, it is possible to use surfactants of ionic (for example, DS-PAC) and ionogenically (for example, OP-10) types.

It is proposed to use sodium methylsiliconate as a water-repellent agent (manufactured by NGL-11 liquid brand). Water repellent, providing

hydrophobicization of solid particles, improves the adhesion of solid particles to foam bubbles, which contributes to cleaning the bottom-hole zone when calling the inflow. In addition, the hydrophobization of the surface of the pore channels makes it possible to more effectively remove water from the near-well zone when invoking the inflow. As a surface dehydrator

It is proposed to use pore channels: methanol, which reduces the adhesion force of water to a solid surface, thus helping to clean the bottom-hole zone from water and increase the phase permeability of

of oil.

Laboratory exa riency. I found the optimal concentrations of the components of the foaming solution for the multicomponent foam, weight. %:

Frother (surfactant) 1-2

Peptizer (for example, NaOH) 3-5 Water repellent (for example,

GKZH-11) 1-3

Dehydrator (e.g.

metaiol) 20-30

Water (fresh or

layer) The rest.

After preparation of the foaming solution of the specified composition, it is foamed and pumped into the well-bottom zone. The degree of aeration (in reservoir conditions) is taken equal to 0.5-1.5. Air, natural gas, and nitrogen are used as the gas phase. The injection of these components into the bottomhole formation zone in the form of foam contributes to an increase in the coverage of less permeable zones of the formation due to the structural and mechanical properties of the foam. After injection of multi-component foam

prior to the initiation of the call, it is kept in the bottomhole formation zone for 3-4 hours to perform the necessary physicochemical processes, after which they begin to call in the inflow, during which the irrigation zone is completely cleaned of clogging material and water.

Multicomponent foam injection into the bottomhole formation zone is carried out through tubing until pressure reaches 30-36 kgf / cm2 above the hydrostatic bottom hole, which, as established by the field-experimental work on foam injection into the formation at a reservoir pressure not higher than hydrostatic, provides - pressing bottomhole zone of sufficient foam.

The development of the well foam in accordance with the proposed method is carried out in the following sequence.

Prepare calculated volumes of foam-like foaming solutions for preparing one-component and multi-component foam. The ground equipment (compressor, flushing unit, aerator) is tied up with the wellhead.

At the first stage, the fluid filling the well is replaced with a two-phase one-component foam, and the injection is carried out according to the Direct Flushing scheme: the foam is pumped into the tubing and the fluid is displaced through the annulus. Compared with the known method. With such injection, smaller bottomhole pressures are created in the foams, which prevents the ingress of excess amounts of water into the formation. The degree of aeration at this stage 1 is equal to 5-10, so as not to cause an influx. The fluid flow is taken equal to 4-6 l / s.

After replacing the fluid filling the lice well with one-component lena at aeration rate a 5-10, they begin to inject a multicomponent foam into the tubing with a consumption of foaming solution of 4-6 l / s and aeration rate (at reservoir pressure) of 0.5-1, five. After the multicomponent flax enters the annular space, the annular valve is closed and the multicomponent foam continues to be injected into the tubing until a pressure of 30–60 kgf / cm above the hydrostatic pressure is reached at the bottom of the well, which ensures the penetration of the foam into the bottom zone of the formation. Then, the well is closed for 3-4 hours to allow the necessary physicochemical processes in the bottomhole zone.

After the well is aged, inflow from the formation is caused by reverse circulation of two-phase (one-component) foam with a gradual catch of aeration level until the required depression is reached on the formation.

When an inflow is called in the well process, the well bottom zone of the reservoir will be cleaned of clogging material and water.

The economic effect from the implementation of the proposed invention on the basis of the TATNEFT association (on the condition that this method is applied to 75% of the fund of wells being drilled in the combination) will exceed 1 million rubles. in the calculation for 1 year.

Claims (2)

1.Ami A.V. Development of oil and gas wells with flames. T.N.T.O. Oilfield, VNIIOENG, M., 1977. 2. Reference book on oil production. M .: Nedra, .1974, p. 166-168 (prototype).