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Method of heavy oil cold flow production

A technology of cold recovery and heavy oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of high production and operation costs and short continuous production time of oil wells, so as to reduce production and operation costs and reduce oil recovery Cost, EOR effect

Inactive Publication Date: 2006-11-15
PETROCHINA CO LTD
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Problems solved by technology

However, there are problems such as short continuous production time of oil wells and high production and operation costs.

Method used

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Examples

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Embodiment

[0020] Example: The Ze 70 heavy oil reservoir in Shennan Oilfield has Qp, Nm, Ng, Ed and Es formations developed from top to bottom in the reservoir, and the oil layers are mainly distributed in Ed. The average depth of the oil reservoir is 2400m, and its oil layer physical properties are : Porosity: 15%~25.5%; Permeability: 208×10 -3 ~2290×10 -3 μm 2 ; Ground crude oil viscosity: (50°C) 1157~85085mPa.s; 20°C crude oil density: 0.9442~1.0035g / cm 3 ; Freezing point: 20~40℃; Colloidal asphaltenes: 29.38%~71.23%; Sulfur content: 0.4%~0.82%; Wax content: 1.56~10.75%; Average reservoir temperature: 93.4℃; 100m; original formation pressure: 23.08MPa; pressure coefficient: 0.99, which belongs to normal temperature and normal pressure heavy oil reservoir.

[0021] During the development of this reservoir, the acid value of the heavy oil in fault block Ze 70 was measured to be 1.26-1.85 mgKOH / g, which belongs to highly active heavy oil. The following steps were taken during the spec...

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Abstract

The present invention discloses a method for heavy oil cold flow production. The utilization of said method can greatly reduce cost of heavy oil production. Said invention is implemented by utilizing the following technical scheme: according to acid value of heavy oil, viscosity of crude oil at 50 deg.C, setting point, wax content, colloid asphalt content and core intersection, effective porosity and permeability, after the utilized alkaline water-soluble visbreaking agent is squeezed into the reservoir, according to design requirements downwards-placing screw pump whose specific tight fit is 0.1-0.4 mm and tightness between the stator and rotor of general ground driven screw pump is less than 0.01-0.05 mm, anchoring oil pipe and utilizing different chemicals to reduce resistance and break viscosity so as to implement cold flow production of heavy oil.

Description

Technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for cold recovery of heavy oil, especially the effective porosity of the oil layer is greater than 5%, and the permeability is greater than 50×10 -3 μm 2 The viscosity of ground crude oil (50°C) is 100-20000mPa.s, and the density of crude oil at 20°C is greater than 0.92g-1.05 / cm 3 , Freezing point: -20~50℃; colloidal asphaltenes 25~75%, sulfur content 0.2~15%, wax content 1.0~30%, acid value 0.85~2.67mgKOH / g, use normal temperature and pressure heavy oil The method of cold harvesting. Background technique [0002] Thermal extraction is a traditional heavy oil extraction method. The core of its technology is to reduce the viscosity of crude oil and improve the flow performance of crude oil by heating the oil reservoir or wellbore, so as to achieve the purpose of increasing the production of oil wells. There are mainly methods such as steam injection...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B49/08F17D1/18
Inventor 付亚荣胡书宝马永忠刘春平张庚祥尤冬青孙玉民李冬青田炜蔡远红
Owner PETROCHINA CO LTD
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