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Nitrogen filling foam water-control oil-increasing technology

A process technology, a nitrogen foam technology, is applied in the field of nitrogen injection foam to control water and increase oil, which can solve the problems of inefficiency, high cost, and inability to effectively develop low-permeability parts of thick oil layers in high-permeability zones. Low cost, obvious effect

Inactive Publication Date: 2006-09-13
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Field practice results show that although these deep profile controls have improved the low-efficiency and ineffective circulation in high-permeability zones of oil layers to a certain extent, there are still some problems, such as: ①Any kind of deep profile control cannot effectively develop thick The low-permeability part at the top of the oil layer; ②Deep profile control requires a large effective radius in order to see the obvious effect of increasing oil and reducing water, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] December 2004, at Xing 7-1-33 Well Pu I 3 3 Layer construction, the thickness of the target layer is 7.1m, and the permeability range is 0.5-1.2μm 2 . The construction started on December 15th, and a total of 19.6235×10 nitrogen gas was injected into the ground during construction. 4 m 3 (under standard conditions), equivalent to an underground volume of 1962.35m 3 , accumulative injection of foam agent 1657m 3 , The foaming agent is composed of high molecular weight anionic polyacrylamide (0.7%) and sodium dodecylbenzene sulfate (0.5%) with a molecular weight > 19 million and a degree of hydrolysis of 25-30%, and the cumulative gas-liquid ratio is 1.18:1. The injection pressure at the wellhead increased from the initial 8.0MPa to 12.5MPa, and the well was connected to increase oil production by 1566 tons per month after construction.

Embodiment 2

[0023] In April 2005, at Xing 7-1-33 Well Pu I 3 2 layers of construction. The thickness of the target layer is 3.7m, and the permeability range is 0.3~1.6μm 2 . Construction began on April 12, and a total of 11.626×10 nitrogen gas was injected into the ground during construction. 4 m 3 (under standard conditions), equivalent to an underground volume of 1162.6m 3 , accumulative injection foam agent 1010m 3 , The cumulative gas-liquid ratio is 1.15:1. The wellhead injection pressure rose from the initial 7.0MPa to 9.3MPa. After construction, the connected oil wells will increase oil production by 699t per month.

[0024] The foaming agent is injected in two stages. The foaming agent in the first stage is composed of sodium dodecylbenzene sulfate (1%), high molecular weight anionic polyacrylamide (1.5%) with a molecular weight > 19 million and a degree of hydrolysis of 25-30%. , Thiourea (0.3%), calcium chloride (2%) and chromium acetate (1.5%). The underground gas-liqu...

Embodiment 3

[0026] In November 2005, construction was carried out on the 6th to 9th floors of Pu II in Well Bei 2-2-158. The thickness of the target layer is 12.5m, and the permeability range is 0.3~0.8μm 2 . The construction started on November 3rd, and a total of 29.98×10 nitrogen gas was injected into the ground during construction. 4 m 3 (under standard conditions), equivalent to an underground volume of 1499m 3 , accumulative injection of foam agent 1618m 3 , The cumulative gas-liquid ratio is 0.93:1. The wellhead injection pressure rose from the initial 11.0MPa to 17.3MPa. Connected oil wells increase oil production by 328 tons per month.

[0027] Inject the foam in 2 stages. The first-stage foaming agent is composed of sodium dodecylbenzene sulfate (0.8%), high molecular weight anionic polyacrylamide (2.5%) with a molecular weight > 19 million and a degree of hydrolysis of 25-30%, thiourea (0.3%), Calcium chloride (2%) and chromium acetate (2.5%). The underground gas-liqui...

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Abstract

The invention relates to a technique for controlling water and increasing oil by injecting nitrogen foam, characterized by mixing nitrogen gas and foaming agent in the bulk ratios of 1 to 2 ¿C 2 to 1, where for a stratum which contains high-permeability belt and has permeability lower than 1000 mdarcy, the foaming agent comprises vesicant, base fluid, stabilizing agent and water; for a stratum which contains high-permeability belt and has permeability higher than 1000 mdarcy, the foaming agent comprises vesicant, base fluid, catalyst, sacrifice agent, cross- linking agent and water. And it is used to selective stop and flooding of injection well, having advantages of obvious water reducing and oil increasing effect and low cost.

Description

Technical field: [0001] The invention relates to a selective plugging and oil displacement technology used in oil fields, which belongs to the technique technology of nitrogen injection foam for water control and oil enhancement. Background technique: [0002] In heterogeneous sandstone oilfields developed by water flooding, due to serious heterogeneity and long-term erosion of injected water, the pore structure of the reservoir has undergone major changes, and a high-permeability zone with a high degree of water washing has formed in the oil layer. Channeling along the high permeability zone causes inefficient and ineffective circulation of the injected water, reduces the oil displacement efficiency of the injected water, and seriously affects the development benefits of the oilfield. For the plugging of low-efficiency and ineffective circulation of injected water in high-permeability zones in oil layers, various oilfields have carried out research on various types of depth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
Inventor 程杰成刘合裴晓含穆芫雷达
Owner DAQING OILFIELD CO LTD
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