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Sectioned well cementation technology for deep trona drilling and mining

A trona and cementing technology, which is applied in earth-moving drilling, wellbore/well components, sealing/packing, etc. The effect of service life

Inactive Publication Date: 2018-08-03
HENAN ZHONGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a staged cementing process for deep trona drilling and mining. By dividing each section of the well body and adopting the method of staged cementing, the mining of deep soluble salts is completely solved. Mineral deposits, the problem of poor well quality in drilling water solution mining, and the technology to improve the quality of cementing

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  • Sectioned well cementation technology for deep trona drilling and mining
  • Sectioned well cementation technology for deep trona drilling and mining
  • Sectioned well cementation technology for deep trona drilling and mining

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Embodiment Construction

[0019] The following will be described in detail in conjunction with the technical solutions in the embodiments of the present invention:

[0020] see figure 1 As shown, the formation packer includes a collar 1, a central pipe 2, a rubber sleeve 3, a valve body 4, and a pup joint 9 designed from top to bottom, and the collar 1, rubber sleeve 3, and valve body 4 are designed from top to bottom The lower sleeve is placed on the outer wall of the central pipe 2, the bottom of the valve body 4 is connected with a nipple 9, the valve body 4 includes a pressure limiting valve 5, a check valve 6, and a locking valve 7, and the valve body 4 is provided with There is disconnect lever 8. During construction, when the replacement rubber plug 10 passes through the formation packer valve body 4, the breaking rod 8 sealed on the liquid inlet hole will be broken, and when the replacement rubber plug 10 runs to the baffle plate 11, the sleeve A seal is formed in the pipe (the pipe string pr...

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Abstract

The invention discloses a sectioned well cementation technology for deep trona drilling and mining. The sectioned well cementation technology comprises the following steps that firstly, a whole wellbore is sectioned, and a formation packer and a grading hoop are mounted on a well cementation sleeve in a series-connection mode; then the lower sleeve well section is sealed and reinforced by adoptinga positive circulation method, a rubber plug of the formation packer is opened firstly, thus the rubber plug and the well wall are sealed, a cement down channel is cut off, then the grading hoop is opened, and first-stage cementing well cementation operation is started; after cement slurry is injected, the grading hoop is closed; after the cement slurry is initially solidified, second-stage cementing well cementation operation is conducted on the upper well section; and after cement is solidified, the rubber plug is drilled, a center pipe is lowered in, and well completion is achieved. A whole well is divided into the two parts according to geologic conditions and downhole conditions, the problems that in the previous first-time well cementation process, the pressure intensity is high, astratum is prone to being pressed to leak, or up-hole of an upper cement slurry face of a leakage layer is not high are solved, the well completion quality is greatly improved, and the service life ofthe production well is prolonged.

Description

technical field [0001] The invention belongs to the technical field of deep drilling and water-soluble mining of trona ore, and the technical field of staged well construction and cementing technology, and in particular relates to a staged cementing process for deep trona drilling and mining. Background technique [0002] At present, for the mining of deeply buried soluble salts (trona, Glauber's salt, rock salt, etc.) deposits, the drilling water-soluble mining method is adopted at home and abroad, that is, the drilling equipment is used to drill the drill bit to the target layer through the drill pipe, and then separately drill The technical casing and the production casing are cemented separately with oil well cement, and then the center pipe is lowered and the wellhead device is installed, which completes the construction process of a production well. [0003] The body structure of natural soda well is basically borrowed from that of oil well, and its cementing method an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 杨帆李华伟董峰赵世民宋辉黄金洋郭海亮阳莹李振
Owner HENAN ZHONGYUAN CHEM
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