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A single-well stimulation method for high-temperature, high-salt, high-wax oil wells

A high-temperature, high-salt, oil well technology, which is applied in wellbore/well components, chemical instruments and methods, and earthwork drilling and production, can solve problems such as high risk, poor safety and environmental performance, and low amplitude, and achieve pertinence and operability Strong, wide range of application, long-term effect

Active Publication Date: 2018-07-31
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 A in an oil field 1 , reservoir temperature 82℃, wax content 18.3%, formation water salinity 25686mg / L, permeability 450×10 -3 μm 2 , Reservoir thickness 3.5m, crude oil viscosity 685mPa.s, porosity 0.313, daily oil 4.0t, daily liquid production 105m 3 , the well spacing is 200m. 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 20d, and the daily dosage of wax removing and preventing agent is 15kg. Method in Well A 1 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0035] 1. Test oil well screening

[0036] Oil well screening criteria are reservoir temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well A 1 The reservoir temperature is 82°C, the wax content is 18.3%, the formation water salinity is 25686mg / L, and the permeability is 450×10 -3 μm 2 1. The thickness of oil l...

Embodiment 2

[0045] Oil well G in an oil field 2 , oil layer temperature is 78℃, wax content is 23.5%, formation water salinity is 19856mg / L, permeability is 750×10 -3 μm 2 , Reservoir thickness 6.8m, crude oil viscosity 786mPa.s, porosity 0.315, daily oil 5.2t, daily liquid production 120m 3 , the well spacing is 125m. 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. Using the method of the present invention Method in Well G 2 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 G 2 The reservoir temperature is 78°C, the wax content is 23.5%, the formation water salinity is 19856mg / L, and the perm...

Embodiment 3

[0056] Oil well K in an oil field 5 , reservoir temperature 80℃, wax content 31.2%, formation water salinity 18765mg / L, permeability 800×10 -3 μm 2 , Reservoir thickness 4.3m, crude oil viscosity 986mPa.s, porosity 0.325, daily oil 3.6t, daily liquid production 150m 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 13d, and the daily dosage of wax removing and preventing agent is 30kg, using the method of the present invention Method in Well K 5 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0057] 1. Test oil well screening

[0058] Oil well screening criteria are reservoir temperature 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well K 5 The reservoir temperature is 80°C, the wax content is 31.2%, the formation water salinity is 18765mg / L, and the permeability is ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a huff-puff stimulation method for a single 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 increasing production by huff and puff of a single well with high temperature, high salt and high wax content. Background technique [0002] The internal cause of waxing in oil wells is that crude oil contains wax, and the more wax content, the more serious the waxing. Under the condition of the oil layer, the wax is dissolved in the crude oil due to the high temperature of the medium. 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 the pressure and temperature. And precipitated. [0003] The wax dissolved in the formation crude oil will gradually precipitate from the crude oil, crystallize and deposit on the surface of the tubing as the temperature and pressure decrease during the production process, resu...

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 刘德爽郭宁李波姚毅唐铬王保锋徐金良王凯孔利军刘静王春芝
Owner 大庆三采技术有限公司
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