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Preparation method of high-temperature resisting and salt-resisting filtrate reducer for drilling fluid

A technology of fluid loss reducer and drilling fluid, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor fluid loss reduction effect, not very obvious effect, and low API fluid loss, etc. Simple, excellent filtration performance, easy to mass-produce

Inactive Publication Date: 2010-06-16
浙江仁智股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, generally speaking, only from the perspective of screening comonomers to solve the problems of high temperature resistance and salt resistance, the effect achieved is not very obvious, the API fluid loss is low, and the fluid loss reducing effect is poor

Method used

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  • Preparation method of high-temperature resisting and salt-resisting filtrate reducer for drilling fluid
  • Preparation method of high-temperature resisting and salt-resisting filtrate reducer for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation method of fluid loss reducer: Dissolve 6.4 kg of sodium hydroxide in 80 liters of deionized water, and simultaneously inject 10.5 liters of acrylic acid into the reactor and stir to mix evenly. Add 21 kg of acrylamide, 3.5 kg of 2-acrylamide-2-methylpropanesulfonic acid, 1.8 kg of urea, 0.5 kg of aluminum citrate, and 0.012 kg of potassium persulfate and mix again. Afterwards, the whole system (pH value about 6.5) was kept at 70°C for 3 hours to obtain the vinyl fluid loss control agent for high temperature and salt drilling fluid. The fluid loss control agent prepared by the above method was mainly determined by the reduction rate of API fluid loss. index, the result is shown in the list.

[0028] main

Embodiment 2

[0030] Preparation method of fluid loss reducer: Dissolve 6.4 kg of potassium hydroxide in 300 liters of deionized water, and simultaneously inject 11.8 liters of acrylic acid into the reactor and stir to mix evenly. Then add 23.2 kg of acrylamide, 1.8 kg of urea, 0.8 kg of aluminum citrate, and 0.015 kg of ammonium persulfate and mix again. Afterwards, the whole system (pH value about 6.0) was kept at 60°C for 3 hours to obtain the vinyl-based high temperature and salt resistant drilling fluid fluid loss reducer. Taking the fluid loss reducer prepared by the above method, the API fluid loss reduction rate is the main factor. index, the result is shown in the list.

[0031] main

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Abstract

The invention relates to a preparation method of a high-temperature resisting and salt-resisting filtrate reducer for a drilling fluid, which comprises the steps of: a, dissolving a vinyl monomer in water, and regulating the pH value to 5.5-8; b, adding an initiating agent and aluminum citrate into the solution, and uniformly stirring and mixing; and c, reacting a mixed solution at a temperature of 40-100 DEG C for 1-4h, wherein the initiating agent is 0.01-0.1 percent of the vinyl monomer in mass, and the aluminum citrate is 1-3 percent of the vinyl monomer in mass. By adding the aluminum citrate solution to enable various vinyl monomers to carry out the copolymerization, the aluminum citrate is simultaneously subjected to coordination complexation with functional groups on the vinyl monomer. The invention has excellent filtration reduction property under high temperature and high salinity drilling environment. The method has simple operation and low requirement on equipment and environment, and is easy to realize the industrialization quantity production.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling in oil and gas fields, in particular to a preparation method for a vinyl type anti-high temperature and salt-resistant drilling fluid fluid loss reducer. Background technique [0002] According to the international general concept, wells with a depth of more than 4500m are deep wells, wells with a depth of more than 6000m are ultra-deep wells, and wells with a depth of more than 9000m are ultra-deep wells. With the increasing depletion of oil and gas resources, oil and gas exploration and development work continues to expand to deep formations. In foreign countries, about half of the wells that have been drilled are above the level of deep wells, and there are even a certain number of ultra-deep wells. When the well depth is more than 5,000 meters, the well temperature is generally above 150°C, and it is very likely to encounter salt-gypsum layers frequently, so that the drilling fluid will be...

Claims

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Application Information

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IPC IPC(8): C09K8/035
Inventor 张军彭波彭商平苗永静于志刚吕宝
Owner 浙江仁智股份有限公司
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