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Method for controlling bottom water channeling by using gas water locking effect

A technology of water lock effect and bottom water, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the problems of high water cut, increased quantity, high water cut, and difficulty in effectively plugging bottom water channels in oil wells.

Active Publication Date: 2020-10-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • 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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  • Method for controlling bottom water channeling by using gas water locking effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, a method utilizing the gas water lock effect to realize the control of bottom water channeling may include the following steps:

[0026] The first step is to prepare foaming agent solution and liquid nitrogen. According to the engineering design requirements, dissolve the foaming agent into clean water to obtain a foaming agent solution and prepare liquid nitrogen;

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

[0028] The third step is to plug the bottom water construction, open the casing 2 valve, inject the foaming agent solution required by the design from the tubing 1 into the pipe string, 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 the ca...

Embodiment 2

[0043] Such as figure 1 Shown, on the basis of embodiment 1, in the first step, according to 3.0 L / m 3 The concentration of the foaming agent will be fully dissolved in the water.

[0044] In the first step, the liquid nitrogen is at minus 20°C, every 800 m 3 Air Configuration 1.0m 3 liquid nitrogen.

[0045] In the second step, after the nitrogen foam construction string 3 is lowered, the oil pipe 1 and casing 2 pressure gauges are also installed on the oil pipe 1;

[0046] Installing and casing pressure gauges, oil pipe 1 and casing 2 pressure gauges at the wellhead 4 are for real-time detection of construction pressure. Connect the blowout pipeline so that after the construction is completed, the wellbore can be blown out and pressure relieved, and the liquid can be discharged to the designated irrigation port.

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

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

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Abstract

The invention discloses a method for controlling bottom water channeling by using a gas water locking effect. The method is mainly suitable for potential tapping of remaining oil of a dwarf oil reservoir. According to the method for controlling bottom water channeling by using the gas water locking effect, nitrogen foam is injected into a stratum at high pressure and large displacement, the pressure of a near-wellbore area is rapidly increased, the injected foam can make up for pressure deficit of a near-wellbore zone, the pressure of the stratum is increased, and the energy of a reservoir isrecovered; and by using the strong oil-water selective plugging effect and Jamin effect of the nitrogen foam, a water cone can be pressed to move downwards, a bottom water channeling channel is effectively plugged, and bottom crude oil is displaced to move upwards to a wellbore to be extracted. Bottom water channeling is effectively controlled, the remaining oil of the reservoir is pushed to the near wellbore through the pressure and the water locking effect generated in the injection process, and the purposes of improving the oil well yield and recovery efficiency of a dwarf oil well and effectively tapping the remaining oil in a potential layer are achieved.

Description

technical field [0001] The invention belongs to the field of exploration and development of oilfields, and in particular relates to a method for controlling the upward channeling of bottom water by using the gas water lock effect. Background technique [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 flooded, seriously affecting the oil recovery. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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