Filtrate loss reducer for high-temperature-resistant oil field drilling fluid and preparation method thereof

An oil field drilling and fluid loss reducing agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor thermal stability of quaternary ammonium groups, polluted heavy metal ions, high price, etc., and achieve excellent high temperature resistance, The effect of low cost and improved safety

Inactive Publication Date: 2014-10-29
JILIN UNIV
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Problems solved by technology

The quaternary ammonium group is a kind of adsorption group with strong adsorption capacity, and also has excellent hydration effect, but the thermal stability of the quaternary ammonium group is poor, which is not conducive to the synthesis of high temperature resistant fluid loss reducer
[0007] The fluid loss control agents used in the prior art include carboxymethyl starch, polyanionic cellulose, activated barite powder, acrylate copolymers, etc. These fluid loss control agents are either expensive or produce heavy metal ions that pollute the environment

Method used

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  • Filtrate loss reducer for high-temperature-resistant oil field drilling fluid and preparation method thereof
  • Filtrate loss reducer for high-temperature-resistant oil field drilling fluid and preparation method thereof
  • Filtrate loss reducer for high-temperature-resistant oil field drilling fluid and preparation method thereof

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preparation example Construction

[0047] A preparation method for an oilfield drilling fluid with high temperature resistant fluid loss reducer, comprising the following steps:

[0048] ① mixing lignin or lignosulfonate and its derivative components with a redox initiator in a mass ratio of 40:3;

[0049] ②Mix vinyl monomers and their derivative components with persulfate at a mass ratio of 200:3;

[0050] ③ Dissolve the above two in water respectively, stir evenly, and activate under nitrogen protection at 50-60°C for 10-30 minutes respectively;

[0051] ④ Mix the solution after initiation and pour it into the reactor, add the crosslinking agent and turn on the stirring, pass in nitrogen for oxygen barrier protection, react at 60-90°C for 3-7 hours, the pressure is normal pressure, and the product obtained after the reaction is completed It is a dark brown liquid, spray-dried into powder.

[0052] Test Conditions:

[0053] Normal temperature and normal pressure: room temperature, standard atmospheric press...

Embodiment 1

[0056] Dissolve 8g of S-lignin in water, add 0.6g of ferrous ammonium sulfate hexahydrate and 0.05g of hydrogen peroxide, fill it with nitrogen gas and activate it in a water bath at 50°C for 20min; mix 13.72g of acrylamide (AM) and 2 -Acrylamide-2-methylpropanesulfonic acid (AMPS) 10g (according to the molar ratio of 4:1), add 0.36g potassium persulfate to the two vinylic monomers, fill with nitrogen gas, seal and activate in a water bath at 50°C 20min; add the first two into a 500mL three-necked bottle, add 0.36g of N,N-methylenebisacrylamide, turn on the stirring and reflux device, raise the temperature to 70°C under nitrogen protection and normal pressure, and react for 4 hours. At the end of the reaction, a dark brown liquid is obtained, and after spray drying, a powdery fluid loss reducer for oilfield drilling fluid with good water solubility and high temperature resistance is obtained.

[0057]See Table 1 for the influence of different lignin inputs on the fluid loss co...

Embodiment 2

[0059] Take 16g of lignosulfonate and dissolve it in water, add 1.2g of ferrous ammonium sulfate hexahydrate and 0.1g of hydrogen peroxide, fill it with nitrogen gas and activate it in a water bath at 50°C for 20min; g, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) 10g, (according to the molar ratio is 4:1) add 0.28g potassium persulfate to the two vinylic monomers, fill it with nitrogen and seal it at 50 ℃ Activate in a water bath for 20 minutes; put the first two into a 500mL three-neck flask, add 0.81g of N,N-methylenebisacrylamide, turn on the stirring and reflux device, and raise the temperature to 60°C under nitrogen protection at normal pressure. Reaction for 7 hours. The liquid obtained after the reaction is dark brown, and after spray drying, a powdery fluid loss reducer for oilfield drilling fluid with good water solubility and high temperature resistance is obtained.

[0060] See Table 2 for the influence of different monomer ratio conditions on the fluid loss c...

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Abstract

The invention relates to a filtrate loss reducer for high-temperature-resistant oil field drilling fluid, a preparation method of the filtrate loss reducer, and application of a treatment agent. A novel high-temperature-resistant filtrate loss reducer is synthesized by implementing the following steps: adopting lignin, acrylamide and 2-acrylamide-2-methyl propanesulfonate as synthetic monomers; enabling the synthetic monomers to perform graft copolymerization under the initiation of potassium peroxodisulfate, ammonium ferrous sulfate hexahydrate and hydrogen peroxide respectively; adding a crosslinking agent, namely N,N-methylene bisacrylamide to enhance the stabilizing force of the synthetic monomers under high temperature condition. The filtrate loss reducer disclosed by the invention adopts waste materials of a paper-making factory, is extensive in source and low in cost, and can be used for absorbing the excellent viscosity reduction capacity of lignin; the introduced acrylamide and 2-acrylamide-2-methyl propanesulfonate can be used for improving the precipitation capacity at a high temperature; N,N-methylene bisacrylamide is added as the crosslinking agent to ensure that a network structure is formed, the high temperature resistance can be improved, an oil and gas layer can be protected from collapsing, and the service life of an oil well can be prolonged. A product disclosed by the invention is applied to the oil field drilling fluid.

Description

technical field [0001] The invention relates to an additive used in oil fields, more specifically, to a fluid loss reducer for high temperature resistant oil field drilling fluid. technical background [0002] In the oil drilling fluid operation, the drilling fluid will percolate in the permeable formation under pressure, causing the drilling fluid to seep into the formation. In order to reduce this water loss phenomenon, ensure the stability of the wellbore and the safe production of oil and gas layers, we need to add fluid loss reducers to the drilling fluid to form a solid-free drilling mud system, reduce water loss, and protect the oil layer from Mud pollution, increase drilling speed, reduce drilling cost, etc. [0003] The synthetic fluid loss additives currently used in oilfield drilling fluids can be mainly divided into the following three types according to the selected monomers: [0004] (1) Non-ionic monomers, commonly used non-ionic monomers include acrylamide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/58C08F222/38C08F289/00
CPCC08F289/00C09K8/035C08F220/56
Inventor 顾强李晔张玉敏赵天琦郭雪
Owner JILIN UNIV
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