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Cold production method for thick oil at edges of oil reservoir structures

A structure and edge technology, which is applied in the field of cold recovery of heavy oil at the edge of the reservoir structure, can solve the problems of large lifting sucker rod torque, asynchronous downward movement of the lifting sucker rod, and difficulty in starting, so as to reduce load, The effect of prolonging the pump inspection time and improving fluidity

Active Publication Date: 2014-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the large torque of the ground-driven screw pump to lift the sucker rod, and the difficulty in starting after stopping pumping; overcome the problem of out-of-synchronization of the pumping unit with coaxial double hollow rods to lift the sucker rod down

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: A method for cold recovery of heavy oil at the edge of a reservoir structure, the steps are as follows:

[0034] Step 1. Preparation of viscosity reducer A containing Lewis base: the weight percentage of each component of viscosity reducer A containing Lewis base is: pyridine, 3.75-4.0%; N-ethylpiperidine, 12.5-13.5%; Tetrahydrofuran: 2.5-3.0%; ethyl acetate, 0.75-1.0%; isopropanol, 15.5-17.5%; phenylethylphenyl polyoxypropyl polyoxyethyl ether, 5.8-6.3%; castor oil fatty acid diethanol Amide, 7.5-8.0%; Fluorocarbon surfactant FN-2, 0.005-0.01%; Sodium hydroxide, 1.5-1.75%; Sodium bicarbonate, 1.25-1.5%; The rest is n-butanol. The sum of the weight percentages of each component is 100%.

[0035] Main equipment: Atmospheric pressure enamel reaction kettle with stirring, heating, cooling and vacuum systems.

[0036] Production method: First, add pyridine, N-ethylpiperidine, tetrahydrofuran, isopropanol and other four components into the enamel reaction ket...

Embodiment 2

[0060] A method for cold recovery of heavy oil at the edge of a reservoir structure, comprising the following steps:

[0061] Step 1, preparing 10 tons of viscosity reducer A containing Lewis base. Prepare 1 ton of viscosity reducer A containing Lewis base by weight percent of each component: pyridine, 3.85%; N-ethylpiperidine, 13.24%; tetrahydrofuran: 2.75%; ethyl acetate 0.87%; isopropanol, 17.25%; phenylethylphenyl polyoxypropyl polyoxyethyl ether, 6.15%; castor oil fatty acid diethanolamide, 7.6%; fluorocarbon surfactant FN-2, 0.0072%; sodium hydroxide, 1.67%; Sodium bicarbonate, 1.35%; n-butanol, 45.2628%. The sum of the weight percentages of each component is 100%.

[0062] Production method: First, add pyridine, N-ethylpiperidine, tetrahydrofuran, isopropanol and other four components into the enamel reaction kettle according to the weight ratio; after stirring for 30 minutes, add phenylethylphenyl polyoxypropyl poly Six raw materials such as oxyethyl ether, castor o...

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PUM

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Abstract

The invention discloses a cold production method for thick oil at the edges of oil reservoir structures, and is applicable to production of thick oil of oilfields. The cold production method includes manufacturing viscosity reducers A containing Lewis alkali for processing shafts and performing magnetic positioning well logging; radially drilling and constructing horizontal wells; squeezing the viscosity reducers A containing the Lewis alkali into the wells; tripping production strings and production pumps into the wells; circulating softened water by the aid of circulating pumps; performing start pumping production on the oil wells when the temperatures of the circulating softened water at outlets of wellheads range from 65 DEG C to 70 DEG C. The cold production method has the advantages that the flowability of the thick oil in the shafts can be improved, cold production stratum crude oil of the thick oil at the edges of the oil reservoir structures can flow into the shafts by the aid of the cold production method, and crude oil in the shafts can be lifted by the aid of the cold production method; loads can be reduced when the oil wells are started, and the pump inspection periods of the oil wells can be prolonged.

Description

technical field [0001] The invention relates to a method for cold recovery of heavy oil at the edge of a reservoir structure. It belongs to the technical field of oil field recovery. Background technique [0002] At present, with the deepening of oil field rolling expansion, there are some extra-heavy oil wells distributed in the edge of heavy oil reservoirs. Electric heating rods are commonly used for heavy oil cold recovery and lifting, wellbore chemical viscosity reduction with screw pumps, and thin oil are mixed. The limitations of technological conditions cannot meet the needs of formation crude oil treatment and wellbore lifting in the process of edge heavy oil production. [0003] Wang Junjie and others published the article "Development and Utilization of Heavy Oil Sand Production Cold Recovery Technology in Taobao Oilfield" in the 11th issue of Oil and Gas Field Surface Engineering Journal in 2004, pointing out that Jilin Oilfield is based on the principles of over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/00
Inventor 付亚荣马永忠刘春平李小永姜一超李淼李冬青付丽霞曹瑾付茜付亚丽王志霞彭菁菁刘万斗靳利孙斌
Owner PETROCHINA CO LTD