Method for calculating dosage of horizontal well chemical water shutoff agent

A water plugging agent and technology for horizontal wells, which are used in earth-moving drilling, wellbore/well components, sealing/packaging, etc. The dosage of water agent is fast and simple, the operability is strong, and the effect of improving oil recovery

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many studies on water shutoff agents for horizontal wells at home and abroad, but there are few studies on the calculation method of water shutoff agent dosage in horizontal wells

Method used

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  • Method for calculating dosage of horizontal well chemical water shutoff agent
  • Method for calculating dosage of horizontal well chemical water shutoff agent

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Embodiment 1

[0027] Example 1 provides a method for calculating the amount of chemical water shutoff agent used in horizontal wells, which is applied to an oil well G160-P6 in the high-shallow southern area. The NmⅡ2 sublayer was put into production, with an initial daily liquid production of 37.2t, a daily oil production of 29.6t, and a water content of 20.5%. Before the water plugging, the daily liquid production was 113.2t, the daily oil production was 3.3t, and the water content was 97.1%.

[0028] NmⅡ2 is a layered edge water-driven reservoir controlled by structure, and the edge water channeled to the wellbore along the near-horizontal direction, causing the oil well to produce water. Therefore, the amount of water blocking agent is calculated according to the cuboid model.

[0029] The NmⅡ2 oil layer is 7m thick and has a porosity of 0.31. The data shows that the reservoirs in the 1908-1954m and 1976-2008m intervals have good reservoir properties and may be the main water outlet. T...

Embodiment 2

[0035] Embodiment 2 provides a method for calculating the amount of chemical water shutoff agent used in horizontal wells, which is applied to a horizontal oil well G104-5P35 in the high and shallow north area. The Ng6 sublayer was put into production, with an initial daily liquid production of 31.97t, a daily oil production of 19.47t, and a water content of 39%. Before the water plugging, the daily liquid production was 222.12t, the daily oil production was 2.22t, and the water content was 99%.

[0036] Ng6 is a massive bottom water-driven reservoir controlled by structure, and the bottom water ridges into the wellbore along the vertical direction, causing the oil well to produce water. Therefore, the amount of water blocking agent is calculated according to the column gap model.

[0037] Well G104-5P35 is designed to selectively shut off water in the entire well section 2051.7-2143.0m. The maximum horizontal depth of water blocking agent distribution is 30m, the length of ...

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Abstract

The invention relates to the technical field of petroleum production engineering, in particular to a method for calculating the dosage of a horizontal well chemical water shutoff agent. In the method, the dosage of the water shutoff agent is calculated by selecting a cuboid model or a cylindrical notched model according to a water invasion type; and the water invasion type comprises edge water drive, bottom water drive or common edge water and bottom water drive. By the method for calculating the dosage of the horizontal well chemical water shutoff agent, the dosage of the water shutoff agentis quickly and easily calculated, and the method has high operability; meanwhile, the amount of the used water shutoff agent for horizontal well chemical water shutoff is optimized; over-high cost isavoided due to over-much injected shutoff agent; the water shutoff effect is guaranteed; the sweep efficiency is improved; and the oil field recovery ratio is improved.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a method for calculating the dosage of a chemical water shutoff agent for a horizontal well. Background technique [0002] With the deepening of oilfield development, the number of horizontal wells continues to increase, the comprehensive water cut of horizontal well development oilfields increases year by year, the water production of high permeability oil layers is serious, and the production potential of low permeability oil layers is difficult to realize. The effective water shutoff technology of horizontal production wells needs to be developed urgently. The unit price of the polymer plugging agent involved in the chemical water plugging of horizontal wells is relatively high. Only by maintaining the low cost while ensuring the water plugging effect can higher economic benefits be obtained. There are many studies on water shutoff agents for horizontal well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
Inventor 李宜坤魏发林陈仁保熊春明刘玉章许寒冰张娜
Owner PETROCHINA CO LTD
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