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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

Active Publication Date: 2015-11-18
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
2. Water-based protective fluid generally contains dissolved gases such as oxygen and carbon dioxide, which makes it difficult to control the corrosion of carbon steel tubing and casing
The cost is relatively high, as high as 300,000 to 500,000 yuan per well

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a liquid mixing tank with a capacity of 10L, 10% of emulsifier oxyethylene sorbitan monooleate span-80 (Jiangsu Haian Petrochemical Plant) was sequentially added in terms of mass percentage, and 0.5% of salt-resistant High-temperature foaming agent polyoxyethylene alkyl alcohol ether (Jiangsu Haian Petrochemical Plant), 0.3% foam stabilizer vegetable gum heteroglycan KD-03 (Jiangsu Runda), 0.1% layering regulator polyoxypropylene Polyoxyethylene ether (Jiangsu Haian Petrochemical Plant), 28% white oil, 0.5% corrosion inhibitor alkynyloxymethyl quaternary ammonium salt (Shanxi Yixintai), and the rest is water, 3000rpm continuous stirring and dosing; Introduce nitrogen with a volume percentage of 8-10%, and continue stirring at a speed of 3000rpm for 30min to form a foam emulsion with a uniform phase state. Put the foam emulsion at room temperature 25°C, pass the stability test, and the result shows that its stability time is >72hr.

[0032] see figure 1 , use the do...

Embodiment 2

[0034] In terms of mass percentage, formulating liquid according to components: 0.1% of nonionic surfactant foaming agent alkylphenol polyoxyethylene ether (Jiangsu Haian Petrochemical Factory), 0.1% of foam stabilizer polyacrylamide HPAM ( Henan Yiqing), 14% emulsifier oxyethylene sorbitol tristearate span65 (Jiangsu Haian Petrochemical Plant), 0.2% regulator phenamine resin ether (Jiangsu Haian Petrochemical Plant), 25% White oil, 0.1% imidazoline corrosion inhibitor SK-05 (Shayang Keruoxing Chemical Industry), and the rest is water.

[0035] see figure 1 , use the dosing pump truck 7 to prepare the liquid from the dosing port 8 according to the formula in the liquid mixing tank 6, and continue to stir and add the medicine to form a foam emulsion with a uniform phase state (no stratification). The annulus between the tubing 3 and the casing 1 is cleaned, and then the packer 2 is set and sealed. After completion, use the liquid injection pump car 5 to inject the annular spa...

Embodiment 3

[0037]In terms of mass percentage, formulating liquid according to components: 12% polyoxyethylene sorbitan trioleate Span85 (Jiangsu Haian Petrochemical Plant), 0.5% foaming agent polyoxyethylene alkyl alcohol ether (Jiangsu Haian Petrochemical plant), 0.2% carboxymethylcellulose sodium salt CMC foam stabilizer (Jiangsu Runda), 0.2% layering regulator hydrazine oxide polyether (Jiangsu Haian Petrochemical Plant), 25% gas oil, 0.8% corrosion inhibitor alkynyloxymethyl quaternary ammonium salt (Shayang Ke Ruoxing Chemical Industry), the rest is water.

[0038] see figure 2 , use the dosing pump truck 7 to prepare the liquid from the dosing port 8 according to the formula in the liquid mixing tank 6, continue to stir and add the medicine to form a foam emulsion, and feed inert gas to make the phase state uniform. Circular flushing, firstly clean the annular space between the tubing 3 and the casing 1, and then set the packer 2 to seal. Drop the ball from the wellhead oil pipe...

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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 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

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Application Information

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Patent Type & Authority Patents(China)
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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