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

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

Active Publication Date: 2012-08-08
SHENGTAI BIOENG CO LTD OF JILIN WANTONG PHARMACY GRP CO
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  • Abstract
  • Description
  • Claims
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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

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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] A certain oil reservoir block is selected, the burial depth of the oil layer is 1020-1400 meters, the depth of the middle part of the oil layer is 1220 m, the average effective thickness is 9.2 m, the temperature of the middle part of the oil layer is 66 ℃, the pressure of the middle part of the oil layer is 12.2 MPa, and the saturation pressure is 9.6 MPa. The 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 this 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 water injection wells were selecte...

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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 invention relates to the application technical field of curdlan, in particular to an application and application method of curdlan as a profile control agent in oil exploitation. Background technique [0002] Curdlan gum (Curdlan), also known as thermal coagulation polysaccharides and thermal gels, is a special microbial polysaccharide, which is connected by β-1,3-glucoside bonds. Generally, each Curdlan The molecule is composed of 300-500 glucose residues, the average degree of polymerization is 450, and the relative molecular weight is about 74,000. It belongs to the category of low-viscosity polysaccharides, insoluble in water, and safe for human body. Curdlan gum is a new type of microbial polysaccharide that has emerged in recent years. It was first discovered by Professor Tokuya Harada in 1966 when he was studying microorganisms that can metabolize petroleum components. Soon, it attracted widespread attention due to its unique physical proper...

Claims

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Application Information

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Patent Type & Authority Applications(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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