Title:
BRIDGE PLUG AND PACKER HAVING RUBBER EXPANDABLE IN OIL
Document Type and Number:
WIPO Patent Application WO/2021/092946
Kind Code:
A1
Abstract:
A petroleum drilling blocking apparatus having a rubber expandable in oil. A formula of the rubber expandable in oil comprises, in parts by weight: 15-18 parts of an ethylene propylene diene monomer rubber, 2-5 parts of carbon black, 1-3 parts of stearic acid, 1-3 parts of calcium oxide, 3-5 parts of iron oxide, 6-8 parts of active zinc oxide, 0.04-0.3 part of zinc dimethyldithiocarbamate, 0.5-1 part of an antioxidant RD, and 0.01-1 part of sulfur. All or some of sealing assemblies of the petroleum drilling blocking apparatus are made of the rubber expandable in oil. The petroleum drilling blocking apparatus is a bridge plug and a packer, respectively. By using the rubber expandable in oil, the expansion efficiency is high and uniform, and the packer and the bridge plug further prepared by using the rubber expandable in oil have advantages of excellent in sealing performance and low in possibility of liquid leakage.
Inventors:
WANG WENBO (CN)
DING QIXING (CN)
DING QIXING (CN)
Application Number:
PCT/CN2019/118939
Publication Date:
May 20, 2021
Filing Date:
November 15, 2019
Export Citation:
Assignee:
DAQING HAIXING PETROLEUM TECH DEVELOPMENT CO LTD (CN)
International Classes:
E21B33/134; C08K3/04; C08K13/02; C08L23/16; E21B33/127
Foreign References:
| CN109138940A | 2019-01-04 | |||
| CN109138940A | 2019-01-04 | |||
| CN107869323A | 2018-04-03 | |||
| CN103642096A | 2014-03-19 | |||
| CN107859501A | 2018-03-30 | |||
| CN107724993A | 2018-02-23 | |||
| US20180087346A1 | 2018-03-29 | |||
| CN101724182A | 2010-06-09 | |||
| US3575238A | 1971-04-20 |
Attorney, Agent or Firm:
CHENGDU KUNLUN HOPE PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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