The method of processing bottom-hole zone of the reservoir gas well

 

(57) Abstract:

The invention relates to the mining industry, in particular to methods for processing bottom-hole zone of the reservoir (PPP) composed of low-permeability clayey terrigenous rocks, in deep wells producing gas. In the annulus at the wellhead place blagodeteli agent is methanol, which is due to the higher than the gas density, is moved to the bottom of a well in the interval of occurrence of the productive formation. Under the action of capillary-diffusion forces it is uniformly impregnates rock bottom-hole formation zone, dissolving in water itself. Flooded agent is removed from the reservoir purge wells. Achieved a uniform impregnation of rocks PPP vlkodlak agent and destruction of flooded agent of the wells to remove water blockade with rocks PPP and increase the permeability of the reservoir. 2 Il., table 2.

The invention relates to the mining industry, in particular to methods for processing bottom-hole zone of the reservoir, composed of low-permeability clayey terrigenous rocks, in deep wells producing gas.

A method of processing bottom-hole formation zone (PPP) with Zibo by discharge in the specified area of the heated nitrogen or superheated water vapor, which carries water from the bottom zone in the adjacent part of the reservoir [1]. The disadvantages of this method are: the complexity of the heating layer zones and that the injection of nitrogen in the water is not removed from the reservoir, and one's pressing away in a more remote part Obvodny it; when the injection of superheated steam into the reservoir gets an additional amount of water.

The known method for the development of gas wells with low formation pressure and high moisture content of the reservoir by removing the capillary water blockade bottom-hole formation zone air injection prior to its connection with the gas-saturated part of the reservoir [2] (the prototype).

The disadvantage of this method is that the air injected into the well under pressure, passes into the reservoir and dehydrate only permeable interlayers and low-permeability sections of the rocks of the PPP remains blocked by water. In addition, by using a known method of removing water blockade with rocks PPP is a pushing water in the adjacent part of the reservoir, which reduces their permeability and a negative impact on well productivity. In addition, the known method is hazardous due to create a mix of the air-gas.

Goal p is dannogo agent of the wells to remove water blockade with rocks PPP and increase the permeability of the reservoir.

To reach this aim the fact that as blagodaryaschih agent use methanol, submission to the bottom zone of the well through its placement in the annulus at the wellhead, move to the bottom of the borehole due to the difference in densities of the agent and gas and impregnation rock bottom-hole formation zone due to capillary-diffusion forces, after dissolution in the waters flooded the agent is removed from the reservoir purge wells.

The method according to the proposed technical solution allows you to:

more complete coverage of the reservoir capacity vlkodlak agent;

- removal from well water together with the agent, and not to put it adjacent to the bottom hole zone of the reservoir, as is the case for the implementation of the technical solutions of the prototype.

The ability to implement the proposed technical solutions confirm to the following experimental data.

In Fig. 1, 2 shows the efficiency of extraction with methanol-water and ions, respectively.

Example 1.

In a separating funnel with a capacity of 50 ml was placed 25 g of bulk soil (layer model), representing the crushed samples of Sandstone is up with distilled water. On top of the model layer is placed 25 g of methanol. The funnel is sealed and left alone at room temperature. Periodically in 2-3 days the supernatant carefully mixed and after clarification take samples for analysis. The water content in methanol determined by NMR. The obtained results confirm the fact of the interpenetration of water and methanol in a porous formation models and aspirations of the system water-ethanol to equilibrium (PL.1, figs.1).

Example 2.

In a separating funnel with a capacity of 500 ml was placed 200 g of bulk soil (formation model, similar to example 1). The bottom model layer impregnated with 100 ml of the diluted saline formation water of SLE. 3 of the sign, the composition close to the condensation water Kovykta gas field (the total content of ions 178 g/l, including, in g/l, and CA+242,1; Mg+214,6; CL-to 121.0). On top of the model layer 250 g of methanol. The funnel is sealed and left alone at room temperature. At regular intervals, the supernatant liquid is stirred and, after clarification, take samples of fluid for titrimetricheskogo analysis on the content of chlorine ions (argentometry), calcium and magnesium (trigonometrical tends to equilibrium (PL.2, Fig.2).

Example 3.

Field tests conducted at well 28 Kovykta gas field, confirm the possibility of using methanol as blagodaraia agent: in the study of sediments Parfenov horizon in the well 28 in depression on the formation of 10% is given to the well production rate equal to 150 thousand m3/day. When the recovered pressure in the well is pumped 5.5 m3methanol and left under pressure for 25 days. After 80 hours of cleaning with depression receive 10% of the flow rate of 180 thousand m3/day. The success of technical operations is 20% of the daily production of the well.

Sources of information

1. Patent 5052490 USA. MKI5E 21 IN 43/24; NCI 166/303; Appl. 20.12.89; publ. 01.10.91.

2. A. C. 1810506 the USSR. MKI5E 21 In 43/25; Appl. 28.02.90; publ. 23.04.93 (prototype).

The method of bottomhole zone treatment productive terrigenous formation gas wells, including filing blagodaryaschih agent in the bottom zone of the well, characterized in that as blagodaryaschih agent use methanol, submission to the bottom zone of the well is carried out by its placement in the annulus at the mouth of the IC is Noah zone formation due to capillary-diffusion forces, after dissolution in water itself, water agent is removed from the reservoir purge wells.

 

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1 dwg, 5 tbl, 5 ex

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