SU1030539A1 - Method for completing well - Google Patents

Abstract

1. METHOD OF DEVELOPMENT, WELLS, including the replacement of Giakoo-1, filling the well with a surfactant solution, creating a repression on the formation by pumping a treatment solution and calling the influx from the formation, reik that exits) Mastered wells, repression created by sequential injection into the reservoir of methanol, a solution of surfactant and gas. 2. The method according to claim 1, characterized by and with the fact that the stripping of a well equipped with a lacquer is carried out in advance from the slaughter area through a podkakyi orkuptsionnym valve .. S

Description

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The invention relates to oil. and the gas production industry, in particular, the development of wells, and can be used predominantly in the development of oil and gas wells 5 exploited under the conditions of a productive reservoir with a highly inhomogeneous permeability along the section.

There is a known method of developing a well by creating a depression in the formation, which includes replacing the fluid filling the well with a solution of a surfactant (SAW) and then hydrating it by supplying gas to the well C 3-5

The closest to the invention in terms of technical essence and the achieved result is a well completion test, which includes replacing a fluid from a well with a surfactant solution, creating a recession into the formation by pumping a treatment solution, causing an influx from the well to C2 J.

However, the known method is designed for Tta use in the development of wells leading out of drilling to remove a small amount of clayey material and water penetrated to a shallow depth into the paste during the opening process. The use of the method in the course of the development of previously loaded oil and gas wells is very efficient. This is due to the fact that large quantities of multicomponent 5 fluids (from several tens to n & hundreds of meters) are used for the wellbore, which, due to the high elasticity of the gas, penetrates into the formation in the process of plugging at considerable distances from the well, especially by you Up Co-replicated props. During the development of the well, this creates additional resistance due to capillary forces and adhesion flow rates, sometimes exceeding the reservoir pressure. The Penna 45 system is not able to penetrate the reservoir to a sufficient depth, disband and later transfer the fluid that was pumped into the well from it .When creating a depression in the reservoir in the wellbore of the gin, there is a pitch column that exerts a certain back pressure on it, which contributes to a decrease in depression. At the same time, the wells opening the reservoir with pressure the rank of which is lower than the hydrostatic drill at the bottom is not mastered.

In addition, in a well equipped with a packer, revealing a reservoir with a large

the thickness of the productive strata and reservoirs that are not uniform in permeability (for example, the Orenburg gas-water satanous field) are mastered mainly by the lower permeable streams, the liquid from which goes through the tubing, while the leach streams with worse reservoir properties are partially or not digested completely, as positing; from them, the fluid does not have a direct exit to the surface (the annulus is closed by a packer).

The aim of the invention is to increase the efficiency of well completion.

This goal is achieved by the fact that, according to the method of mastering sktazhin, which includes replacing the fluid filling the well with a solution of a surfactant, creating a repression on the formation by pumping a treatment solution and causing an influx from the formation. repression is created by sequential injection into the reservoir of methanol, a solution of surfactant and gas.

P1; and this, the stripping of a well equipped with a packer is preliminarily carried out of the annulus through a sub-packer circulation valve.

The drawing shows the scheme of the method.

The proposed method of development in the case of a well-operated well operation is carried out as follows.

With the help of known means, a 1% aqueous solution of PAW is pumped into the annular space, which is used to force out a killing fluid through the tubing and flush the well. It is for this, that through the tubing and the annular space, at the highest possible cost, they press into the reservoir located in the reservoir with an OSI 1% aqueous solution of W) with subsequent injection in a volume of at least 30% of the volume of the kill fluid in the reservoir, followed by After the injection, a 1% surfactant solution is injected into the well volume and pushed into the paste with subsequent gas injection into the reservoir using one of the known methods. Gas injection is carried out until the pressure in the wellbore drops. Penetrated into the reservoir in the first place surfactant, then methanol with the next. a portion of the surfactant reduces capillary forces by reducing the surface tension of water contained in the hydration fluid, destroys the pigtails and entrains the particles of the ginghy gland and distributes them in bulk. A PS in a gas flow in a ppasg produces dapeneous dispersion of the fluid in the reservoir and mixing it with a PVA solution and methanol. Gas, due to higher flowability in the reservoir, breaks through the fluid to the reservoir gas, establishing a connection between the well and the reservoir, as evidenced by the poor pressures in the wellbore. Thereafter, the formation of depression at the formation is initiated by a sharp decrease in pressure at the wellhead (opening of the well). Owing to the opening of the well, there is a drop in pressure in its tailpipe and in the near-wellbore zone of the plugged formation, which causes grit into the well of liquid and gas. The gas injected into the reservoir expands back to the well, followed by the reservoir gas rushes along with the fluid in the reservoir which, foaming in the wellbore, comes to the surface through the tubing and the surrounding space. The remaining part of the killing fluid in the reservoir is dispersed in a large volume of rocks and has a significant effect on the productivity of the well. The well is blown off or into the barn through the tubing and annulus to clean gas. Creation of repression on the reservoir of the paths. Injecting methanol, the solvent of PAW in a non-foamed state and gas allows these agents to be pumped into the reservoir to a sufficient depth, and thereby affect the entire: volume of suppressing fluid in the reservoir, destroy its connection with breed. The injection of a larger volume of gas releases the wellbore and the bottomhole zone of the reservoir from the fluid, which contributes to an increase in depression to the formation at the initial moment of the call for fluid inflow, and gas into the well. The proposed development method for packer operation of a well is carried out as follows. In the recessed well, the tubing with the packer and the circulating valve in the closed position are swollen in the closed position; the extinguishing fluid in the well is replaced with an aqueous surfactant solution followed by flushing of the well. At the same time, the surfactant coagulator is pumped into the wellbore by means of known means through the open annulus and displaces the kill fluid before the tubing. After flushing the well, the packer is unpacked and the spindle circulating valve is opened. Then the surfactant solution remaining in the well is forced into the formation by treating solution 4 injected into the tubing. A portion of the treatment solution, in turn, is pumped into the reservoir by gas, which is injected until the pressure in the wellbore drops. Then they start creating a depression on PTTast by decreasing the pressure in the wellbore (opening the tubing), which causes the flow of fluid and gas from the formation and wellblowdown. At the initial moment of the call for inflow, the gas accumulated in the upper part of the annulus escapes through the sub-circulating circulating valve and the tubing to the surface. As a result, pressure decreases in the upper part of the annular space, which causes the inflow of liquid and gas from the overlying low-permeable interlayers and their development in the annular space. through this sub-packer circulating valve. During this period, the underlying highly permeable layers are not mastered, since the liquid column formed in the annulus and the HCP has a certain resistance to them, the magnitude of which depends on the height of the liquid column and its specific gravity (in the Orenburg gas condensation conditions) The height of the liquid column is composed of ZOOg35O m). This leads to a decrease in depression on the underlying high-pasting interlayers and a decrease in the amount of fluid coming from them. After the outflow of liquid from the overlying interlayers stops and the gas of the sub-circulating circulation valve starts to flow, it is closed to absorb the underlying high-permeable interlayers of. Tubing Thus, in the presence of a subpacker circulation valve in a well equipped with a packer, the development of the underlying highly permeable interlayers is carried out mainly along the tubing, and the overlying interlayers with worse reflector properties through the annular space through the subsucker circulation valve and further along the tubing. Blow-off. Wells lead to clean gas.

Claims (2)

; 1. DEVELOPMENT METHOD> WELLS, which includes replacing the fluid ', te filling the well with a surfactant solution, creating repression on the formation by injecting the treatment solution and causing an influx from the formation, kicking off in order to increase the efficiency of the process well assimilation, repression is created by successively injecting methanol, a solution of a surfactant and gas into the formation. 2. The method of pop. 1, otpichat and Й with the fact that · blowing a well equipped with a packer from the annulus is carried out previously through a sub-packer circulation valve.