Packer liquid capable of reducing carbon dioxide corrosion at high temperature under high pressure and preparation method thereof

A technology of carbon dioxide, high temperature and high pressure, applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of not reducing carbon dioxide packer fluid, increasing corrosiveness, and not meeting packer fluid anticorrosion Requirements and other issues, to achieve the effect of easy completion operation, low corrosion, good thermal stability

Active Publication Date: 2015-12-09
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material used to prepare high-density brine spacer fluid is usually bromide salt (such as CaBr 2 , ZnBr 2 etc.) and formate, due to CaBr 2 /ZnBr 2 It is highly corrosive itself, and its use in high-temperature and high-pressure wells is limited. Formate, such as HCOOK, etc., although it is not very corrosive, HCOOK brine can be used in the presence of CO 2 After the gas enters, its corrosiveness increases significantly, so it cann

Method used

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  • Packer liquid capable of reducing carbon dioxide corrosion at high temperature under high pressure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1 prepares the packing fluid of the present invention according to the following steps:

[0027] (1) Compound salt weighting agent preparation: Take 850g of potassium pyrophosphate and 150g of sodium diethylenetriaminepentamethylene phosphonate, stir and mix evenly to prepare a compound salt weighting agent;

[0028] (2) Packing fluid preparation: add 3g NaOH to 1000g fresh water, stir for 5 minutes to fully dissolve; then add 940g compound salt weighting agent, stir for 30 minutes to fully dissolve; finally add 2g sodium sulfite oxygen scavenger and 50g 1-aminoethyl-1 - Carboxymethyl-2-heptadecenyl imidazoline chloride corrosion inhibitor, stir evenly, settle and filter at rest, and obtain a density of 1.45g / cm 3 the packing fluid.

Embodiment 2

[0029] Embodiment 2 prepares the packing fluid of the present invention according to the following steps:

[0030] (1) Compound salt weighting agent preparation: Take 800g of potassium pyrophosphate and 200g of potassium hexamethylenediamine tetramethylene phosphonate, stir and mix evenly to prepare a compound salt weighting agent;

[0031] (2) Packing fluid preparation: add 2g NaOH to 1000g fresh water, stir for 5 minutes to fully dissolve; then add 760g compound salt weighting agent, stir for 30 minutes to fully dissolve; finally add 2g sodium sulfite oxygen scavenger and 30g 1-aminoethyl-1 - Carboxymethyl-2-heptadecenyl imidazoline chloride corrosion inhibitor, stir evenly, settle and filter at rest to obtain a density of 1.25g / cm 3 the packing fluid.

Embodiment 3

[0032] Embodiment 3 prepares the packing fluid of the present invention according to the following steps:

[0033] (1) Compound salt weighting agent preparation: Take 850g of potassium pyrophosphate and 150g of sodium diethylenetriaminepentamethylene phosphonate, stir and mix evenly to prepare a compound salt weighting agent;

[0034] (2) Packing fluid preparation: add 5g NaOH to 1000g fresh water, stir for 5 minutes to fully dissolve; then add 1400g compound salt weighting agent, stir for 30 minutes to fully dissolve; finally add 3g sodium sulfite oxygen scavenger and 50g 1-aminoethyl-1 -Carboxymethyl-2-heptadecenyl imidazoline chloride corrosion inhibitor, stir evenly, settle and filter at rest, and obtain a density of 1.60g / cm 3 the packing fluid.

[0035] 1. Compatibility evaluation of packer fluid with seawater and produced water: Mix the packer fluid prepared in Examples 1-3 with seawater and simulated produced water at a volume ratio of 1:1, observe the occurrence of p...

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Abstract

The invention discloses a packer liquid capable of reducing the carbon dioxide corrosion at a high temperature under a high pressure and a preparation method thereof. The packer liquid is composed of the following components in parts by weight: 100 parts of fresh water, 0.20 to 0.50 part of NaOH, 0.10 to 0.30 part of deoxidant, 1 to 6 parts of corrosion inhibitor, and 10 to 200 parts of composite salt weighting agent; wherein the composite salt weighting agent is prepared by compounding inorganic phosphate and organic phosphonate. The packer liquid is a non-solid phase, and the density can reach 1.60 g/cm3 or more. The packer liquid can tolerate a temperature of 150 DEG C, and is capable of reducing the corrosion of carbon dioxide on tubing in the wells at a high temperature under a high pressure. Furthermore, compatibility between the packer liquid and seawater/stratum produced water is good, and thus the packer liquid can be applied to the well-completion practice on an oil gas well with a high carbon dioxide content at a high temperature under a high pressure.

Description

technical field [0001] The invention relates to a working fluid in high-temperature and high-pressure well completion operations and a preparation method thereof, in particular to a packer fluid capable of reducing carbon dioxide corrosion under high temperature and high pressure and a preparation method thereof, belonging to the technical field of oilfield chemistry. Background technique [0002] During the completion operation, the liquid remaining in the annular gap between the oil well tubing and casing or the technical casing and the reservoir casing is called packer fluid or annular space protection fluid. The main purpose of the packer fluid is to maintain the static pressure of the liquid column between the surface layer or the technical casing, and prevent the pressure difference between the inside and the outside from endangering the casing. More importantly, the packer fluid needs to protect the surface layer and the inner wall of the intermediate casing and the o...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 谢玉洪李中王尔钧舒福昌颜帮川冯雪松马磊魏安超胡伊旭向兴金李蔚萍赵志超黄亮刘平
Owner CHINA NAT OFFSHORE OIL CORP
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