Fracturing method for improving recovering ratio by phase permeability improver

A phase permeability and improving agent technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of production index reduction, water content increase, and short validity period, so as to reduce treatment cost investment and improve Oil displacement efficiency, effect of increasing swept volume

Inactive Publication Date: 2005-05-11
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above technical measures have achieved good results in field practice, they also have certain limitations, such as: ①The stimulation technology for high water-cut oil layers cannot improve the recovery rate, and the water cut increases rapidly after the measures; ②Selective water shutoff technology The effective period of reducing the water cut of the oil well is short, and the production index will decrease after the measures are taken; ③ The combination of water plugging and fracturing technology is aimed at multiple layers, which cannot effectively solve the contradictions in layers; Implement applications from the well

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  • Fracturing method for improving recovering ratio by phase permeability improver
  • Fracturing method for improving recovering ratio by phase permeability improver
  • Fracturing method for improving recovering ratio by phase permeability improver

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specific Embodiment approach 1

[0024] Specific implementation mode 1: The fracturing method of using phase permeability improving agent to enhance oil recovery in this embodiment is realized in the following way: fracturing is performed in a thick oil layer with high water content to form artificial sand-filled fractures, and the phase permeability is increased through the fractures. The improver is sent to the deep part of the formation, and the phase permeability improver is leaked into the formation through the wall surface of the artificial fracture, forming a phase permeability treatment zone in the near wellbore zone of the oil well and around the fracture. The phase permeability improving agent includes polyacrylamide (PAM) and a cross-linking agent, wherein the concentration of the polyacrylamide is 100-5000 ppm, and the concentration of the cross-linking agent is 10-1000 ppm. The molecular weight of the polyacrylamide is 1 million to 40 million, and the degree of hydrolysis is 0 to 40%. The crosslin...

specific Embodiment approach 2

[0025] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the phase permeability improving agent also includes a surfactant accounting for 0.001% to 0.1% of the total weight of the phase permeability improving agent, and the surfactant can be Anionic, cationic or nonionic surfactants such as petroleum sulfonates or alkylbenzene sulfonates.

specific Embodiment approach 3

[0026] Specific embodiment 3: The difference between this embodiment and specific embodiments 1 and 2 is that the phase permeability improving agent also includes a co-solvent accounting for 0.01-30.0% of the total weight of the phase permeability improving agent, and the co-solvent is ethanol , propanol, isopropanol, pentanol, formaldehyde, acetaldehyde in one or more.

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Abstract

A fracturing method for increasing the recovering rate of oil well by use of phase permeability improver features that the hydraulic fracturing method is used to generate artificial crack and the phase permeability improver is filled in the stratum via oil well to form a phase permeability improved zone around the artificial crack, which has the selectivity to the osmotic oil-water flow, reducing the relative permeability of water.

Description

Technical field: [0001] The invention relates to a fracturing method for controlling water in thick layers with high water content to increase oil production, increase efficiency and enhance recovery of oil wells. Background technique: [0002] After the elastic recovery period, most of the oilfields in the world have adopted the water flooding development method, and have entered the high water cut recovery stage one after another. With the deepening of oilfield development, the production decline rate of water flooding increases year by year, and the benefit of oilfield development continues to decrease. Fracturing technology is the most widely used and most effective oil well stimulation measure at home and abroad, but in the high water cut period, fracturing is easy to cause water flooding of oil wells, and the water content of oil wells rises faster after fracturing. And the water cut rises, the production cost is greatly increased, so that the oil well loses the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/26
Inventor 王德民韩松李庆松
Owner DAQING OILFIELD CO LTD
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