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A kind of oil and gas well cementing method

A technology for oil and gas wells and cementing, which is used in wellbore/well components, earth-moving drilling, sealing/packaging, etc. The effect of improving cementing quality

Active Publication Date: 2018-08-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention solves the technical problem that the cement slurry in the cementing annulus of the adjustment well is affected by the water invasion of the high-pressure water channeling layer by providing a cementing method for oil and gas wells

Method used

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  • A kind of oil and gas well cementing method
  • A kind of oil and gas well cementing method
  • A kind of oil and gas well cementing method

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Embodiment Construction

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] A kind of oil and gas well cementing method that the embodiment of the present invention provides, refer to figure 1 shown, including the following steps:

[0039] S101. Determine the replacement construction time required for the oil and gas well to replace the quick-setting cement slurry according to the relevant size parameters of the o...

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Abstract

The invention discloses a well cementing method for an oil and gas well. The method comprises: according to related dimensions and parameters of oil and gas well cementation, determining replacement construction time required by replacement fast setting cement slurry construction of an oil and gas well; according to the replacement construction time, preparing fast setting cement slurry and retardant setting cement slurry; pumping and injecting a flushing fluid, the retardant setting cement slurry, and the fast setting cement slurry into an oil-string casing in the oil and gas well; pumping and injecting a displacing fluid to the oil-string casing in first displacement, when the fast setting cement slurry is displaced to a casing float shoe on the bottom of an oil and gas well, pumping and injecting the displacing fluid to the oil-string casing in second displacement, so as to displace all the fast setting cement slurry to a well cementation annulus. The variable displacement well cementation construction method of firstly first displacement and then second displacement can displace the fast setting cement slurry in place on the premise of zero addition of thickening time, preventing water of a high-pressure water channeling layer from damaging the cement slurry in the annulus in a dissolution and transporting manner. Thus, influence of water invasion is prevented.

Description

technical field [0001] The invention relates to the technical field of oil field development by water flooding, and in particular relates to a cementing method for oil and gas wells. Background technique [0002] With the development of oilfields gradually facing the old oilfields, the cementing workload of adjustment wells in water injection development blocks is increasing year by year. After long-term water injection development of adjustment wells, formation pressure has changed, and high permeability wells will be formed in different well sections of oil and gas layers. Low-pressure water-absorbing layer and high-pressure water channeling layer caused by disconnected water injection. [0003] In the past adjustment well cementing construction, a displacement is usually used to replace the cement slurry to the cementing annulus, and the replacement is completed within the thickening time of the cement slurry, that is, a period of additional thickening time is left. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 唐世忠步宏光张东艳韩克玉吕照鹏杨涛张学强李文娟
Owner PETROCHINA CO LTD
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