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A method for compound huff and puff oil recovery in high temperature, high salt and high waxy oil wells

A high-temperature, high-salt, oil-well technology, applied in chemical instruments and methods, production fluids, earth-moving drilling, etc. Wide application range and long validity period

Active Publication Date: 2018-04-17
大庆三采技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the oil layer pressure is low, a large amount of well washing water will enter the formation to cause clay expansion, block the oil layer, and pollute the formation. In addition, thermal wax removal will also cause backflow of the well washing fluid, affecting normal production
During the process of thermal wax removal, the heat loss on the wellbore is large, and it will also make it difficult to remove the wax at the bottom of the wellbore; mechanical wax prevention has high labor intensity, energy consumption is also large, and the cost is high; chemical wax prevention has a validity period Shortcomings, high cost and poor safety and environmental performance; at the same time, the above method can only solve the problem of wax deposition in the wellbore of the oil well
[0005] Through literature search, the patent number "ZL03156478.x", titled "The Method of Steam Injection Thermal Recovery for Waxy Low Permeability Reservoirs", introduced a method of producing waxy low permeability reservoirs by combining steam huff and puff and steam flooding. The disadvantages of this invention are: (1) The cost of steam injection thermal recovery is high and the risk is high; (2) The corrosion and maintenance costs of the pipe string are high; (3) Due to the low permeability of low permeability reservoirs and the poor fluidity of crude oil, steam injection Thermal recovery has a low rate of enhanced recovery, and the effect is limited; (4) The selection conditions for oil reservoirs are relatively strict, especially for the thickness and depth of oil reservoirs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Oil well L in an oil field 6 , reservoir temperature 87℃, wax content 19.8%, formation water salinity 23563mg / L, permeability 320×10 -3 μm 2 , oil layer thickness 4.5m, crude oil viscosity 1235mPa.s, porosity 0.302, daily oil 4.3t, daily fluid production 115m 3 , the well spacing is 128m. Before the test, the well controls the wax deposition of the oil well by hot washing and adding wax remover. The average hot wash cycle is 25d, and the daily dosage of wax remover is 20kg. method in oil well L 6 The implementation of single well huff and puff field test, the specific implementation steps are as follows:

[0035] 1. Screening of test wells

[0036] Oil well screening criteria are oil layer temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well L 6 The oil layer temperature is 87℃, the wax content is 19.8%, the salinity of the formation water is 23563mg / L, and the permeability is 320×10 -3 μm 2 , The thickness of the oil layer is 4.5m, whic...

Embodiment 2

[0044] Oil well M in an oil field 3 , reservoir temperature 79℃, wax content 28.3%, formation water salinity 18765mg / L, permeability 850×10 -3 μm 2 , oil layer thickness 4.0m, crude oil viscosity 658mPa.s, porosity 0.335, daily oil 3.2t, daily fluid production 98m 3 , the well spacing is 135m. Before the test, the well controls the wax deposition of the oil well by means of hot washing and adding a wax remover. The average hot wash cycle is 18d, and the daily dosage of the wax remover is 25kg. method in oil well M 3 The implementation of single well huff and puff field test, the specific implementation steps are as follows:

[0045] 1. Screening of test wells

[0046] Oil well screening criteria are oil layer temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well M 3 The oil layer temperature is 79℃, the wax content is 28.3%, the salinity of the formation water is 18765mg / L, and the permeability is 850×10 -3 μm 2 , The thickness of the oil layer ...

Embodiment 3

[0054] Oil well R in an oil field 1 , reservoir temperature 83℃, wax content 31.2%, formation water salinity 11456mg / L, permeability 650×10 -3 μm 2 , oil layer thickness 2.3m, crude oil viscosity 678mPa.s, porosity 0.326, daily oil 5.2t, daily fluid production 146m 3 , the well spacing is 126m. Before the test, the well controls the wax deposition of the oil well by means of hot washing and adding a wax remover. The average hot wash cycle is 16d, and the daily dosage of the wax remover is 30kg. method in oil well R 1 The implementation of single well huff and puff field test, the specific implementation steps are as follows:

[0055] 1. Screening of test wells

[0056] Oil well screening criteria are oil layer temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well R 1 The oil layer temperature is 83℃, the wax content is 31.2%, the salinity of formation water is 11456mg / L, and the permeability is 650×10 -3 μm 2 , The thickness of the oil layer is ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a composite huff-puff oil production method for a high-temperature high-salinity high-wax-content oil well. The method specifically comprises the following steps of screening of the tested oil well, selection of a single well huff-puff process, and field test. The method has the characteristics of being simple in process, pertinent and long in validity period; and meanwhile, the method can effectively control wax deposition of the high-temperature high-salinity oil well and has the oil production increasing effect. Accordingly, the method can be widely applied to wax removal and prevention and single well stimulation processes of wax-containing oil wells.

Description

technical field [0001] The invention relates to a method for tertiary oil recovery, in particular to a method for compound huff and puff oil recovery in high temperature, high salt and high wax oil wells. Background technique [0002] The internal cause of oil well waxing is that crude oil contains wax. The more wax content, the more serious the waxing is. Under the condition of the oil layer, due to the high temperature of the medium, the wax is dissolved in the crude oil. When the crude oil flows from the oil layer to the bottom of the well, and then rises from the bottom of the well to the wellhead, the solubility of the wax in the crude oil decreases due to the decrease of pressure and temperature. and precipitation. [0003] The wax dissolved in the crude oil of the formation will gradually precipitate from the crude oil, crystallize and deposit on the surface of the oil pipe with the decrease of temperature and pressure during the production process, resulting in wax ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06E21B43/16E21B43/20C09K8/524
CPCC09K8/524E21B37/06E21B43/164E21B43/20
Inventor 侯志强平大源孙杰葛辉徐丽张峰邱朋刘宏伟田东惠张海峰王宝生李伟赵娣李娟
Owner 大庆三采技术有限公司
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