Title:
METHOD FOR CIRCULATORY USE OF FOAM IN FOAM DRILLING BY MEANS OF LOW-CARBON ALCOHOL
Document Type and Number:
WIPO Patent Application WO/2012/010061
Kind Code:
A1
Abstract:
A method for circulatory use of foam in foam drilling by means of low-carbon alcohol. The method comprises the following steps: adding a low-carbon alcohol to foam reemerging from a well at the opening for defoaming; foaming the defoamed foam liquid to be injected to the well for reuse, thereby achieving a circulatory use of foam. A defoaming agent comprises at least a low-carbon alcohol having a structure of R—OH, wherein R is an alkyl group having four or five carbon atoms. The low-carbon alcohol has both defoaming and foam stabilizing effects. Employment of the method for foam circulation requires only the addition of the low-carbon alcohol for defoaming. The defoamed base liquid can be refoamed and be injected into the well for reuse. After multiple cycles, when the low-carbon alcohol accounts for 5% by volume of the foam base liquid, the low-carbon alcohol can be removed, then a foaming agent can be added for foaming, thus achieving multiple circulatory reuses of the foam base liquid, while the low-carbon alcohol can also be reused. The low-carbon alcohol is nonselective towards foaming agents, and has a rapid defoaming speed, the ability to reduce costs of foam drilling, and environmental friendliness.
Inventors:
MENG, Yingfeng (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
孟英峰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
WAN, Liping (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
万里平 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
LI, Yongjie (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
李永杰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
孟英峰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
WAN, Liping (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
万里平 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
LI, Yongjie (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
李永杰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
Application Number:
CN2011/077126
Publication Date:
January 26, 2012
Filing Date:
July 14, 2011
Export Citation:
Assignee:
SOUTHWEST PETROLEUM UNIVERSITY (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610500, CN)
西南石油大学 (中国四川省成都市新都区新都大道8号, Sichuan 0, 610500, CN)
MENG, Yingfeng (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
孟英峰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
WAN, Liping (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
万里平 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
LI, Yongjie (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
西南石油大学 (中国四川省成都市新都区新都大道8号, Sichuan 0, 610500, CN)
MENG, Yingfeng (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
孟英峰 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
WAN, Liping (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
万里平 (中国四川省成都新都新都大道8号, Sichuan 0, 610050, CN)
LI, Yongjie (8 Xindu Dadao, XinduChengdu, Sichuan 0, 610050, CN)
International Classes:
E21B21/14; C09K8/035; C09K8/38
Attorney, Agent or Firm:
CHENGDU JIUDINGTIANYUAN INTELLECTUAL PROPERTY AGENCY LTD. (ZHAN, YongbinRoom 405, 33 Ximianqiao Street, Wuho, Chengdu Sichuan 1, 610041, CN)
Claims: