| 摘要 |
FIELD: oil and gas industry. ^ SUBSTANCE: the invention relates to oil and gas industry, in particular, to suspension of gas and gas-condensate wells during their construction and operation. Substance: The method comprises: the descent of production string with wellhead isolating valve, circulating valve, packer and landing nipple; hanging the production string in the tubing head pendant of the Christmas tree; filling the well bore with working fluid; installing a sealing device in the landing nipple; packing and sealing the well top. Furthermore, before the production string is descended into the well, the well bore is filled with gas condensate. After the descent of the production string and packing the circulating valve is opened and the packer hole clearance is filled with antifreeze packer fluid, while the packer tube side is filled with antifreeze fluid. Then the circulating valve is closed along with the wellhead isolating valve. A back flow valve is installed in the tubing head pendant of the Christmas tree, and bull plugs are installed in side outlets of the tubing head. The well bore below the packer and the plug is left filled with gas condensate. ^ EFFECT: improved gas well suspension reliability, prevented bottom-hole formation zone pollution, facilitated setting the well into operation after its suspension with minimum cost and labour input. ^ 1 dwg |
