Annulus protective fluid for annular mechanical seat sealing of oil and gas wells and construction technology thereof

An annular protective fluid and annular machinery technology, which is used in wellbore/well components, earth-moving drilling and production, etc., can solve the difficulty of corrosion control of carbon steel tubing and casing, the wellhead has jacking force, and the wellhead is easy to thaw, etc. problem, to achieve the effect of low cost, convenient pressure relief, and large compressibility
CN103275685BActive Publication Date: 2015-11-18PETROCHINA CO LTD
2 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2015-11-18

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides annular suspension protection liquid of an annular suspension mechanical seat seal oil well, which comprises the raw materials by weight percent: 10-14% of an emulgator for a low interfacial tension surfactant, 0.1-0.5% of a foaming agent for a nonionic surfactant, 0.1-0.3% of a foam stabilizer, 25-28% of an oil phase, 0.5-1% of a corrosion inhibitor for water-based quaternary ammonium salt, and the balance of water. The annular suspension protection liquid of the annular suspension machinery seat seal oil well, disclosed by the invention, can be used for protecting an oil lantern ring being in the annular suspension state, the corrosion mitigation rate is relatively good, uplifting pressure can not be generated onto an opening of the well, the ageing of a packer can be prevented, and the cost of the annular suspension protection liquid can be reduced.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to an annulus protection fluid for natural gas wells, in particular to an annulus protection fluid for annulus mechanical seat sealing oil and gas wells and a construction process thereof. Background technique

[0002] During the development of gas fields at home and abroad, in order to protect the inner wall of the casing and the outer wall of the tubing from H 2 S and CO 2 Corrosion, etc., adopt the method of injecting high-efficiency protective fluid into the annulus of oil casing. At present, the commonly used annulus protection fluids include water-based annulus protection fluid and oil-based annulus protection fluid.

[0003] When oil and gas wells use water-based annulus protection fluid, there are the following problems: 1. When the temperature is low in winter, the wellhead is easy to thaw, and there is a lifting force on the wellhead, which poses a great safety hazard. 2. Water-based protective fluid generally contain...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More