Solid-phase-free high density well killing fluid

A high-density, well-killing fluid technology, applied in the chemical field, can solve problems such as poor thermal stability, poor reservoir compatibility, and secondary damage to near-well reservoirs, and achieve low system viscosity, strong corrosion resistance, and simple on-site preparation quick effect

Inactive Publication Date: 2016-06-08
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a solid-free high-density well killing fluid, which is used to solve the problems of poor reservoir compatibility, poor thermal stability, and crystallization during the secondary adjustment of the killing fluid density in the conventional well killing fluid in the prior art. The block and solid phase have the technical problem of causing secondary damage to the near-wellbore reservoir

Method used

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  • Solid-phase-free high density well killing fluid

Examples

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Embodiment

[0020] The embodiment of the present application provides a solid-free high-density well killing fluid, including: oxygen scavenger, corrosion inhibitor, compound salt weighting agent, crystallization inhibitor, waterproof locking agent and water, wherein the mass percentage of each component The content is: 0.1-0.5% of oxygen scavenger, 0.5-3.0% of corrosion inhibitor, 40-70% of compound salt weighting agent, 5-15% of high-efficiency crystallization inhibitor, 0.1-1.5% of waterproof locking agent, and the rest is water. The sum of the mass percentages of the components is 100%.

[0021] In the solid-free high-density killing fluid: the oxygen scavenger can be a compound of sodium thiosulfate and thiourea, and the compounding ratio is 1:3, where the compounding ratio refers to the weight ratio;

[0022] The corrosion inhibitor can be a compound of Mannich base and chlorinated 2-alkyl-1-(N-polyoxyethylene-2-aminoethyl) imidazoline-1-benzyl ammonium fatty acid salt, the corrosio...

example 1

[0031] The components and mass percentages of the solid-free high-density killing fluid are: 0.1-0.2% oxygen scavenger, 0.5-3.0% corrosion inhibitor, 40-50% compound salt weighting agent, and 5% high-efficiency crystallization inhibitor. ~ 8%, waterproof locking agent 0.1 ~ 0.5%, the rest is water, the sum of the weight percentages of each component is 100%.

[0032] The solid-free high-density well killing fluid provided in Example 1 is suitable for low porosity and low permeability, well temperature ≤ 150°C, and formation pressure coefficient of 1.5-1.6g / cm 3 Reservoir testing and workover.

example 2

[0034] The components and mass percentages of the solid-free high-density well killing fluid are: 0.2-0.3% oxygen scavenger, 0.5-3.0% corrosion inhibitor, 50-60% compound salt weighting agent, and 8 high-efficiency crystallization inhibitors. ~10%, waterproof locking agent 0.5~1.0%, the rest is water, and the sum of the weight percentages of each component is 100%.

[0035] The solid-free high-density well killing fluid provided in Example 2 is suitable for low porosity and low permeability, well temperature 150-165°C, formation pressure coefficient 1.6-1.7g / cm 3 Reservoir testing and workover.

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Abstract

The invention discloses a solid-phase-free high density well killing fluid, which comprises the following components in percentage by weight: 0.1 to 0.5% of deoxidant, 0.5 to 3.0% of corrosion inhibitor, 40 to 70% of composite salt weighting agent, 5 to 15% of crystallization inhibitor, 0.1 to 1.5% of water locking resistant agent, and the balance being water, wherein the water locking resistant agent is prepared by compounding perfluoro octyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, and methanol/ethanol. The provided solid-phase-free high density well killing fluid has the advantages of no solid phase, low system viscosity, strong anticorrosion performance, little biological toxicity, good reservoir compatibility, and simple and convenient onsite preparation, and solves the problems that conventional well killing fluids have bad reservoir compatibility and thermal stability; crystallization and agglomeration happen when the density of well killing fluid is adjusted for a second time, and solid phase in the well killing fluid damages the reservoir that is next to the well for a second time. The comprehensive performance of well killing fluid is improved.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a solid-free high-density well killing fluid. Background technique [0002] At present, with the continuous expansion of my country's offshore oil exploration and development scale, CNOOC Bohai Oilfield, PetroChina (Jidong Oilfield, Liaohe Oilfield, Dagang Oilfield), Sinopec Shengli Oilfield, etc. have increased their exploration efforts in the Bohai Bay block year by year. There are more and more high-pressure deep wells, and the demand for oil testing operations is also increasing. [0003] At the same time, the development wells in the old blocks that have entered the middle and late stage of production, such as Chenghai District 1 and Chenghai District 2 of Dagang Oilfield, etc., have an increasing demand for workover operations (downhole operations, oil well overhaul). In the completed wells in new exploration blocks, such as the Dagang Binhai block and the NP403×1 block o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12C09K2208/32
Inventor 郝志伟宋有胜王宇宾徐鸿志赵文娜张明锋邓君宇刘小攀张鹏远叶松滨
Owner BC P INC CHINA NAT PETROLEUM CORP
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