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A method for controlling bottom water channeling by utilizing gas water lock effect

A technology of water lock effect and bottom water, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of high water content, low efficiency, and increased quantity of oil wells, so as to improve oil recovery and improve oil recovery. Oil displacement efficiency, effect of slowing coning

Active Publication Date: 2022-08-05
PETROCHINA CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bottom water reservoirs in Jurassic oilfields are widely distributed and are typical shallow reservoirs with a buried depth of 800-1000m. They have high initial production and sufficient bottom water energy. They are mainly developed by natural energy. Influenced by factors such as production contradictions and bottom water coning, some oil wells have high water cut or even water flooding, which seriously affects the oil recovery factor
According to statistics, the number of Jurassic oil wells due to high water cut and water flooding has reached hundreds, and the number is still increasing, which has affected the sustained and stable production of oil fields
In recent years, some Jurassic water plugging tests have been carried out in oilfields. The effective rate is less than 60%, and the daily oil increase of a single well is about 0.5 tons. After plugging, the high water content and the difficulty of effectively plugging the bottom water channel have become constraints to the development of this technology. Therefore, it is urgent to explore new water plugging methods to solve the problem of Jurassic oil well water plugging

Method used

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  • A method for controlling bottom water channeling by utilizing gas water lock effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown in the figure, a method for controlling bottom water channeling by utilizing gas water lock effect, comprises the following steps:

[0026] The first step, preparation of foaming agent solution and liquid nitrogen, according to the needs of engineering design, dissolve the foaming agent in clear water to obtain a foaming agent solution, and prepare liquid nitrogen;

[0027] In the second step, the injection pipe string and the wellhead 4 are prepared, the nitrogen foam construction pipe string 3 is run down, and the wellhead 4 is installed;

[0028] The third step is to plug the bottom water, open the valve of casing 2, inject the foaming agent solution required by the design into the pipe string from the tubing 1, and the foaming agent enters the annulus between the pipe string and the wellbore from the bottom of the pipe string until the entire wellbore is filled with foaming agent, and the overflowing foaming agent is discharged from casing 2;...

Embodiment 2

[0043] like figure 1 As shown, on the basis of Example 1, in the first step, according to 3.0 L / m 3 The concentration will fully dissolve the foaming agent into the water.

[0044] In the first step, the liquid nitrogen is at minus 20 ℃, every 800 m 3 Air configuration 1.0m 3 Liquid nitrogen.

[0045] In the second step, after the nitrogen foam construction pipe string 3 is run down, the pressure gauge of the oil pipe 1 and the casing 2 is also installed on the oil pipe 1;

[0046] Installation and casing pressure gauges, tubing 1 and casing 2 pressure gauges of wellhead 4 are for real-time detection of construction pressure. Connect the blow-off pipeline so that the wellbore can be vented and depressurized after the construction is completed, and the liquid can be discharged to the designated filling port.

[0047] In the third step, a foaming agent solution of 1.5 times the volume of the wellbore is injected.

[0048] In the fifth step, liquid nitrogen that is twice th...

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Abstract

The invention discloses a method for controlling bottom water breakthrough by utilizing the gas water lock effect, which is mainly suitable for tapping the potential of remaining oil in Jurassic oil reservoirs. The gas water lock effect provided by the invention realizes the method of controlling bottom water channeling, injects nitrogen foam into the formation with high pressure and large displacement, and rapidly increases the pressure in the near-wellbore area. It can also restore the reservoir energy, and use the strong oil-water selective plugging effect of nitrogen foam and the Jia Min effect, which can also force the water cone to move down, effectively block the channel of bottom water, and displace the bottom crude oil to the wellbore. Mined. Effectively control bottom water breakthrough, and the pressure and water lock effect generated during the injection process push the remaining oil in the reservoir to the near wellbore, so as to achieve the purpose of improving the oil well production and recovery rate of the Jurassic oil well and effectively tapping the remaining oil in the latent layer.

Description

technical field [0001] The invention belongs to the field of oilfield exploration and development, and in particular relates to a method for controlling bottom water breakthrough by utilizing the gas water lock effect. Background technique [0002] The bottom water reservoirs in the Jurassic Oilfield are widely distributed and are typical shallow reservoirs, with a burial depth of 800-1000m, high initial production and sufficient bottom water energy, which are mainly developed by natural energy. Influenced by factors such as production contradiction and bottom water coning, some oil wells have high water cut or even water flooding, which seriously affects the oil recovery factor. According to statistics, the number of Jurassic oil wells with high water cut and water flooding has reached hundreds, and the number is still increasing, which has affected the continuous and stable production of the oilfield. In recent years, some Jurassic water plugging tests have also been carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/16
CPCE21B43/16
Inventor 张矿生段鹏辉卜向前齐银李向平康博李转红顾燕凌汪澜王飞
Owner PETROCHINA CO LTD
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