Annular suspension protection liquid of annular suspension mechanical seat seal oil well and construction process thereof

An annulus protection fluid and annulus machinery technology, applied in wellbore/well components, earthwork drilling and production, etc., can solve the problems of carbon steel tubing and casing corrosion control, the upward force of the wellhead, and the ease of thawing at the wellhead, etc. problems, to achieve the effect of low cost, convenient pressure relief and high compressibility

Active Publication Date: 2013-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 large safety hazard

Method used

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  • Annular suspension protection liquid of annular suspension mechanical seat seal oil well and construction process thereof
  • Annular suspension protection liquid of annular suspension mechanical seat seal oil well and construction process thereof
  • Annular suspension protection liquid of annular suspension mechanical seat seal oil well and construction process thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Add 10% of emulsifier oxyethylene sorbitol monooleate span-80 (Jiangsu Province Haian Petrochemical Plant) in order by mass percentage in a liquid mixing tank with a capacity of 10L, 0.5% of salt and salt resistance High-temperature foaming agent polyoxyethylene alkyl alcohol ether (Hai'an Petrochemical Plant, Jiangsu Province), 0.3% foam stabilizer plant colloid KD-03 (Jiangsu Runda), 0.1% layering regulator polyoxypropylene Polyoxyethylene ether (Haian Petrochemical Plant in Jiangsu Province), 28% white oil, 0.5% corrosion inhibitor alkynyloxymethyl quaternary ammonium salt (Shanxi Yixintai), the rest is water, 3000rpm continuous stirring and dosing; A nitrogen gas of 8-10% by volume is introduced, and stirring is continued at 3000 rpm for 30 minutes to form a homogeneous foam emulsion. Put the foam emulsion at room temperature 25℃, pass the stability test, the result shows that its stability time> 72hr.

[0032] See figure 1 , Use the dosing pump truc...

Example Embodiment

[0033] Example 2

[0034] In terms of mass percentage, liquid formulation according to the components: 0.1% non-ionic surfactant foaming agent alkylphenol polyoxyethylene ether (Haian Petrochemical Plant in Jiangsu Province), 0.1% foam stabilizer polyacrylamide HPAM ( Henan Yiqing), 14% of the emulsifier oxyethylene sorbitol tristearate span65 (Jiangsu Haian Petrochemical Plant), 0.2% of the regulator phenolamine resin ether (Jiangsu Haian Petrochemical Plant), 25% White oil, 0.1% imidazoline corrosion inhibitor SK-05 (Sayangke Ruoxing Chemical), and the rest is water.

[0035] See figure 1 , Use the dosing pump truck 7 to prepare the liquid from the dosing port 8 in the dosing tank 6 according to the formula, and continue to stir the dosing to form a foamy emulsion with uniform phase (no stratification). Clean the annulus between the tubing 3 and the casing 1, and then seal the packer 2. After completion, use the liquid injection pump truck 5 to inject the annulus protection liq...

Example Embodiment

[0036] Example 3

[0037] Calculated by mass percentage, formulating liquid according to component formula: 12% polyoxyethylene sorbitol trioleate Span85 (Jiangsu Province Haian Petrochemical Plant), 0.5% foaming agent polyoxyethylene alkyl alcohol ether (Jiangsu Province Haian Petrochemical plant), 0.2% carboxymethyl cellulose sodium salt CMC foam stabilizer (Jiangsu Runda), 0.2% layering regulator hydrazine olefin oxide polyether (Jiangsu Haian Petrochemical Plant), 25% gas oil, 0.8% corrosion inhibitor alkynyloxymethyl quaternary ammonium salt (Sayangke Ruoxing Chemical), the rest is water.

[0038] See figure 2 , Use the dosing pump truck 7 from the dosing port 8 to prepare the liquid in the dosing tank 6 according to the formula, continue to stir the dosing to form a foamy emulsion, and pass inert gas with a uniform phase. Circulating well washing, firstly clean the annulus between tubing 3 and casing 1, and then seal the packer 2. A ball is thrown from the wellhead tubing ...

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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.

Description

Technical field [0001] The invention relates to an annulus protection fluid for natural gas wells, in particular to an annulus protection fluid for sealing oil and gas wells with an annulus mechanical seat and a construction technology thereof. Background technique [0002] During the development of domestic and foreign gas fields, in order to protect the inner wall of the casing and the outer wall of the tubing from H 2 S and CO 2 Wait for corrosion, and use the method of injecting high-efficiency protection fluid into the annulus of the tubing and casing. At present, the commonly used annulus protection fluids include water-based annulus protection fluid and oil-based annulus protection fluid. [0003] When water-based annulus protection fluid is used in oil and gas wells, 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 greater safety risks. 2. The water-based prot...

Claims

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Application Information

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IPC IPC(8): C09K8/54E21B41/02
Inventor 李琼玮曾亚勤张书平郭钢孙雨来朱方辉李慧奚运涛杨全安
Owner PETROCHINA CO LTD
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