(US10301532) Engineering formation wettability characteristics 机翻标题: 暂无翻译,请尝试点击翻译按钮。

源语言标题
(US10301532) Engineering formation wettability characteristics
公开号/公开日
US20160272873US10301532 / 2016-09-222019-05-28
申请号/申请日
US15/073,302 / 2016-03-17
发明人
Mahadevan JagannathanFathi Najafabadi NarimanChawathe Adwait;
申请人
CHEVRON;
主分类号
IPC分类号
C09K-008/58 E21B-043/16 E21B-049/00 E21B-049/08
摘要
(US10301532) Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.
机翻摘要
暂无翻译结果,您可以尝试点击头部的翻译按钮。
地址
代理人
代理机构
;
优先权号
2015US-62135834 2016US-15073302
主权利要求
(US20160272873) 1. A method to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet, the method comprising:   providing a formation;   providing an aqueous stream for injecting into the formation;   adding a reducing agent to the aqueous stream; and   injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation, wherein the reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. 2. The method of claim 1, further comprising:   obtaining the characteristics of the formation;   obtaining the characteristics of the brine of the formation;   obtaining the characteristics of the hydrocarbons of the formation; and   wherein when the reducing agent is added to the aqueous stream, the reducing agent yields a sufficient amount of oxyanions to change the surface charge to a more negative value to make the surface of the formation more water-wet and reduce adherence of the hydrocarbons to the surface of the formation. 3. The method of claim 1, further comprising:   providing a database correlating interactions of a plurality of reducing agents with the characteristics of the formation, the characteristics of the brine, and the characteristics of the hydrocarbons, wherein the reducing agents are selected from reducing agents which when added to the aqueous stream, yield oxyanions having formula AxOyz−, where A represents a chemical element and O represents an oxygen atom. 4. The method of claim 3, wherein the database further contains interactions of the plurality of the reducing agents with zeta potential data of the formation. 5. The method of claim 3, wherein the database further contains interactions of the plurality of the reducing agents with contact angle data of the formation. 6. The method of claim 1, wherein the reducing agent is selected from sodium carbonate, sodium nitrate, sodium bisulfite, sodium meta bisulfite, sodium dithionite, sodium sulfate, or any combination thereof. 7. The method of claim 1, wherein the reducing agent when added to the aqueous stream yields oxyanions selected from carbonate (CO32−), nitrate (NO3−), metabisulfite ([S2O5]2−), bisulfite (HSO3−), dithionite ([S2O4]2−), sulfate (SO42−), or any combination thereof. 8. The method of claim 1, wherein the reducing agent is added to the aqueous stream in an amount of less than 5,000 ppm. 9. The method of claim 1, wherein the reducing agent is added to the aqueous stream in an amount ranging from 50 ppm to 3,500 ppm. 10. The method of claim 1, wherein the reducing agent donates electrons to bring the surface charge to isoelectric conditions by charge transfer. 11. The method of claim 1, further comprising de-aerating and de-oxygenating the aqueous stream prior to the addition of the reducing agent. 12. The method of claim 1, wherein the formation is a carbonate formation, a siliceous formation, or any combination thereof. 13. The method of claim 1, further comprising providing a surfactant, a mobility control agent, or any combination thereof to the aqueous stream having the reducing agent. 14. The method of claim 13, wherein the aqueous stream having the reducing agent and the surfactant, the mobility control agent, or any combination thereof is injected into the formation after an aqueous stream without the reducing agent is injected into the formation. 15. The method of claim 1, wherein a second aqueous stream comprising surfactant, mobility control agent, the reducing agent, or a combination thereof is injected into the formation after injection of the aqueous stream with the reducing agent. 16. The method of claim 1, wherein the aqueous stream with the reducing agent is injected into the formation after an aqueous stream without the reducing agent is injected into the formation. 17. The method of claim 1, wherein injecting the aqueous stream with the reducing agent into the formation includes alternating injection of an aqueous stream without the reducing agent and the aqueous stream with the reducing agent. 18. The method of claim 1, further comprising changing an ionic composition of the aqueous stream. 19. A method to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet, the method comprising:   providing the formation;   treating the surface of the formation by injecting an aqueous stream containing a sufficient amount of a reducing agent, wherein the reducing agent when added to the aqueous stream yields a sufficient amount of oxyanions to change a surface charge to a more negative value to make the surface of the formation more water-wet to enhance recovery of hydrocarbons from the formation; and   flooding the formation with a sufficient amount of surfactant to recover hydrocarbons from the formation, wherein the sufficient amount of the surfactant is at least 10% less than an amount of surfactant required for equivalent recovery of hydrocarbons without the treatment of the surface of the formation with the reducing agent. 20. The method of claim 19, further comprising injecting a mobility control agent into the formation. 21. The method of claim 19, wherein the reducing agent is selected from sodium carbonate, sodium nitrate, sodium bisulfite, sodium meta bisulfite, sodium dithionite, sodium sulfate, or any combination thereof. 22. A method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation, the method comprising:   providing a plurality of substrates representative of the formation;   providing a plurality of brine compositions;   providing a plurality of reducing agents characterized as yielding oxyanions when added to the aqueous stream, wherein the oxyanions are selected from carbonate (CO32−), nitrate (NO3−), metabisulfite ([S2O5]2−), bisulfite (HSO3−), dithionite ([S2O4]2−), sulfate (SO42−), or any combination thereof;   conducting an uncertainty analysis using various combinations of the substrates, the brine compositions, and the reducing agents;   correlating results from the uncertainty analysis to determine interactions between the reducing agents, the brine compositions, and concentration of the reducing agents with wettability altering characteristics; and   using the correlated results from the uncertainty analysis to select a brine composition with at least one reducing agent to inject into the formation to enhance recovery of the hydrocarbons from the formation. 23. The method of claim 22, wherein the uncertainty analysis comprises sessile drop tests, contact angle tests, spreading coefficient tests, zeta potential tests, soaking at least some of the plurality of substrates in some of the brine compositions for predetermined periods of times before adding any reducing agent to these brine compositions, adding a droplet of oil to at least one soaked substrate, adding a predetermined amount of a particular reducing agent to a particular brine composition and analyzing changes in wettability of particular substrate, or any combination thereof. 24. The method of claim 22, wherein the uncertainty analysis comprises Design of Experiments, Karhunen-Loeve transform, Principal Component Analysis (PCA), sensitivity analysis, or any combination thereof.
法律状态
GRANTED
专利类型码
A1B2
国别省市代码
若您需要申请原文,请登录。

最新评论

暂无评论。

登录后可以发表评论

意见反馈
返回顶部