Oil well water shutoff agent and oil well water shutoff method

A water plugging agent, oil well technology, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling and other directions, can solve the cost problem, the plugging agent has not been industrially applied and other problems, achieve strong temperature resistance, improve oil-water interface Performance, low cost effect

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two plugging agents have not been ap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Oil well water shutoff agent formula: take about 1000g product as an example.

[0046] 0.01g average molecular weight is 10000 petroleum sulfonate condensate (PF200A, product of Huiyuan Synthetic Agent Factory), 0.45g nonylphenol polyoxyethylene ether phosphate (produced by Beijing Xingpu New Product Development Center), 0.01g n-butyl Alcohol, 834.7g of Tahewai heavy oil (viscosity of 1660mPa·s at 50°C), 164.7g of water.

[0047] An oil well has been put into production since October 2006. The effective thickness of the oil layer is 20m, the depth of the oil well is 5500m, the temperature of crude oil under the reservoir conditions is 150°C, and the salinity of formation water is 220000mg / L (the concentration of calcium and magnesium ions is 13000mg / L). Crude oil viscosity at 50°C is 300mPa.s. Initial daily production liquid 120m 3 , 115 tons of oil per day. In March 2009, the water cut increased rapidly, and the daily liquid production increased to 200m 3 , daily o...

Embodiment 2

[0049] Oil well water plugging agent formula: take about 1000g product as an example

[0050] 0.97g sodium lignosulfonate (PF200A, product of Huiyuan Synthetic Agent Factory), 0.19g nonylphenol polyoxyethylene ether sulfate (produced by Beijing Xingpu New Product Development Center), 7.8g n-hexanol, 895g Tahe TK4- 1 well of crude oil (viscosity at 50°C is 3329mPa.s), 97g of water.

[0051] An oil well has been put into production since September 2008, the effective thickness of the oil layer is 15m, and the viscosity of crude oil at 50°C is 1780mPa.s. Initial daily production liquid 65m 3 , 60 tons of oil per day. In September 2009, the water cut increased rapidly, and the daily liquid production increased to 110m 3 , daily oil production dropped to 15 tons. In March 2010, the water shutoff agent and water shutoff method of the present invention were implemented, and the water shutoff agent was squeezed into 110m from the oil jacket annulus 3 , shut down the well for 2 da...

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Abstract

The invention relates to an oil well water shutoff agent and an oil well water shutoff method. The oil well water shutoff agent comprises an anionic surfactant, a nonionic-anionic surfactant, C1-C8 fatty alcohol, viscous oil and water. The oil well water shutoff agent has the characteristics of strong high-mineralization water resistance, strong temperature tolerance, strong stability, low cost, no pollution to stratums, and the like.

Description

technical field [0001] The invention relates to an oil well water shutoff agent and an oil well water shutoff method. Background technique [0002] At present, most oilfields in my country have entered the middle and late stages of exploitation, and water flooding is widely used. After decades of intensive exploitation, some oilfields have entered a period of "high water cut, high input, and low output". In addition, for newly developed oilfields in the west, such as Tahe Oilfield, etc., due to the high oil recovery rate, the bottom water in the reservoir is coning, the oil well breaks through water prematurely, and the water cut rises too fast. Moreover, the pressure of most oil wells has dropped after many years of production, usually due to high water cut after slow water flooding, and oil and water flow out together for a long time. The problem of water output from oil wells will have a serious impact on oil fields. The energy of the oil layer decreases due to the wate...

Claims

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Application Information

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IPC IPC(8): C09K8/44E21B33/10
Inventor 秦冰罗咏涛李本高
Owner CHINA PETROLEUM & CHEM CORP
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