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Application of curdlan as profile control agent in petroleum exploitation and application method

A technology for oil extraction and application methods, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems that have not yet been developed, especially in applications, and have not seen any research or reports, etc., to restore water flooding sweep efficiency , improve the plugging effect and balance the permeability effect

Active Publication Date: 2013-12-25
SHENGTAI BIOENG CO LTD OF JILIN WANTONG PHARMACY GRP CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Curdlan gum has a strong oil-incorporating property and can be used as a material for good products and nutrients, so it is widely used in the food industry, but its application in other fields has not yet been developed, especially in oil field exploitation. any research or reports

Method used

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  • Application of curdlan as profile control agent in petroleum exploitation and application method
  • Application of curdlan as profile control agent in petroleum exploitation and application method
  • Application of curdlan as profile control agent in petroleum exploitation and application method

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Embodiment

[0022] Select a certain reservoir block, the burial depth of the reservoir is 1020~1400 meters, the depth of the middle of the reservoir is 1220m, the average effective thickness is 9.2m, the temperature of the middle of the reservoir is 66℃, the pressure of the middle of the reservoir is 12.2MPa, and the saturation pressure is 9.6MPa. Permeability is 6.7×10 -3 , The original oil saturation is 55%, the porosity is 16%, and the original oil-gas ratio is 37.0m 3 / t. The total salinity of the formation water is 6550-8847mg / L, the pH value is 6-9, and the water type is sodium bicarbonate type. The geological reserves of the block are 396.1×10t, and the control area is 2.7km 2 , The recovery degree is 25.25%, and the cumulative injection-production ratio is 1.5. There are 58 wells in this block, including 18 water injection wells and 40 oil wells.

[0023] Using multi-factor comprehensive decision-making, four injection wells were selected for profile control. The well numbers are: 2...

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Abstract

The invention discloses an application of curdlan as a profile control agent in petroleum exploitation and an application method. The application method comprises the following steps of: (1) cooling a water injection well pipeline which needs plugging to 20-30 DEG C; (2) uniformly stirring fruit shell powder with water, injecting the mixed solution into the water injection well pipeline while stirring, and stopping injection when pressure at the port of the water injection well is observed; and (3) according to the injection method in the step (2), respectively injecting a composite plugging agent, curdlan, the composite plugging agent and the fruit shell powder, continuously injecting steam into the water injection well pipeline after injection of all the raw materials, and carrying out oil extraction. Used as a profile control agent, curdlan has advantages of high intensity of a gelling system, good plugging performance, strong compatibleness with stratum water and strong stability, which can guarantee validity during its application process, and also can be used for well completion and well workover after drilling well, fracturing and tertiary oil recovery.

Description

Technical field [0001] The present invention relates to the technical field of application of Kodran glue, in particular to an application and application method of Kodran glue as a profile control agent in petroleum exploitation. Background technique [0002] Curdlan, also known as thermocoagulated polysaccharides and thermogels, is a kind of microbial polysaccharides with special properties. It is connected by β-1,3-glucoside bonds. In general, each Curdlan The molecule is composed of 300-500 glucose residues, with an average degree of polymerization of 450 and a relative molecular weight of about 74,000. It belongs to the category of low-viscosity polysaccharides and is insoluble in water and safe to humans. Kederan gum is a new type of microbial polysaccharide that has emerged in recent years. It was first discovered accidentally in 1966 by Professor Tokuya Harada who studied microorganisms that can metabolize petroleum components. Soon, it attracted widespread attention due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/42
Inventor 严希海万丽萍滕晓彩刘方坤王健
Owner SHENGTAI BIOENG CO LTD OF JILIN WANTONG PHARMACY GRP CO
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