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Composite huff-puff oil production method for high-temperature high-salinity high-wax-content oil well

A high-temperature, high-salt, oil-well technology, applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve problems such as high risk, poor safety and environmental protection performance, backwashing of well washing fluid, etc., and achieve pertinence and operability. The effect of strong, wide application range and strong reliability

Active Publication Date: 2016-09-07
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

[0035] Oil well L in an oil field 6 , oil reservoir temperature 87℃, wax content 19.8%, formation water salinity 23563mg / L, permeability 320×10 -3 μm 2 , Reservoir thickness 4.5m, crude oil viscosity 1235mPa.s, porosity 0.302, daily oil 4.3t, daily liquid production 115m 3 , the well spacing is 128m. Before the test, this well controls the waxing of the oil well by hot washing and adding wax removing and preventing agent. The average hot washing cycle is 25d, and the daily dosage of wax removing and preventing agent is 20kg. Using the method of the present invention method in well L 6 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0036] 1. Test oil well screening

[0037] Oil well screening criteria are reservoir temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well L 6 The reservoir temperature is 87°C, the wax content is 19.8%, the formation water salinity is 23563mg / L, and the permeabilit...

Embodiment 2

[0045] Oil well M in an oil field 3 , the reservoir temperature is 79°C, the wax content is 28.3%, the formation water salinity is 18765mg / L, and the permeability is 850×10 -3 μm 2 , Reservoir thickness 4.0m, crude oil viscosity 658mPa.s, porosity 0.335, daily oil 3.2t, daily liquid production 98m 3 , the well spacing is 135m. Before the test, this well controls the waxing of the oil well by hot washing and adding wax removing and preventing agent. The average hot washing cycle is 18d, and the daily dosage of wax removing and preventing agent is 25kg. Method in Well M 3 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0046] 1. Test oil well screening

[0047] Oil well screening criteria are reservoir temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well M 3 The reservoir temperature is 79℃, the wax content is 28.3%, the formation water salinity is 18765mg / L, and the permeability is 850×10 -3 ...

Embodiment 3

[0055] Oil well R in an oil field 1 , oil reservoir temperature 83℃, wax content 31.2%, formation water salinity 11456mg / L, permeability 650×10 -3 μm 2 , Reservoir thickness 2.3m, crude oil viscosity 678mPa.s, porosity 0.326, daily oil 5.2t, daily liquid production 146m 3 , the well spacing is 126m. Before the test, this well controls the waxing of the oil well by hot washing and adding wax removing and preventing agent. The average hot washing cycle is 16d, and the daily dosage of wax removing and preventing agent is 30kg. Using the method of the present invention method in Wells R 1 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0056] 1. Test oil well screening

[0057] Oil well screening criteria are reservoir temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well R 1 The reservoir temperature is 83°C, the wax content is 31.2%, the formation water salinity is 11456mg / L, and the permeabilit...

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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 present invention involves three methods of oil collection, which specializes in a method of high -temperature, high salt, high salt and high waxy oil wells composite throughput. Background technique [0002] The inner reasons for the wax of oil wells are crude oil content. The more wax content, the more serious the waxing.Under the conditions 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 into the bottom of the well, and then rises from the bottom of the well to the well, the solubility of wax in crude oil decreases due to the decrease in pressure temperature.And precipitated. [0003] The wax dissolved in the stratigraphy crude oil will gradually precipitate, crystallize, and deposit on the surface of the oil pipes with the decrease of temperature and pressure during the mining process, causing waxing on the surface of the oil pipe. [0004] Oil well waxin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06E21B43/16E21B43/20C09K8/524
CPCC09K8/524E21B37/06E21B43/164E21B43/20
Inventor 刘琴
Owner 大庆三采技术有限公司
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