Saturated salt filtrate reducer polymer for drilling fluid

A technology of fluid loss reducer and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of lack of drilling aids, etc., and achieve high salt resistance, high compatibility, and good temperature resistance Effect

Inactive Publication Date: 2015-12-23
ANHUI LUHAI PETROLEUM AUX TECH
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, there is less and less shallow crude oil in the world, and the mining depth is getting deeper and deeper, but there is still a shortage of drilling aids for deep and ultra-deep wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] A saturated salt fluid loss reducer polymer for drilling fluid is made of the following ingredients by percentage: raw material A (polymer) 80%, raw material B (modified starch) 20%.

[0019] Further, the polymer is prepared by mixing calcium deacrylate, lignite resin and sodium polyacrylate at a ratio of 3:2:1.

[0020] Further, the preparation method of the treatment agent is:

[0021] 1) Weigh 80% of the mixture of calcium acrylate, lignite resin and sodium polyacrylate, and 20% of starch according to the proportion;

[0022] 2) Dissolve or disperse starch in deionized water, stir at 55-60°C until it is completely gelatinized to obtain a 5-7wt% starch solution; add 80U / mL cellulase to the obtained starch solution, and adjust the pH of the solution to Adjust the pH value to 5.5, and control the temperature to 65°C. After 2 hours of reaction, adjust the pH value of the starch solution to 8, keep the temperature constant, add 120U / mL alkaline protease, and react for 4 ...

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Abstract

The invention discloses a saturated salt filtrate reducer polymer for drilling fluid. The saturated salt filtrate reducer polymer is prepared from the following components in percentage by weight: 80 percent of raw material A (polymer) and 20 percent of raw material B (modified starch). The saturated salt filtrate reducer polymer is prepared by reacting natural materials with active substances with special functions by a special process; the saturated salt filtrate reducer polymer is superior to artificially-synthesized polymer filtrate reducers in property, has better temperature tolerance and salt tolerance, and is suitable for drilling fluid systems containing fresh water, and saline water and seawater with various concentrations; the saturated salt filtrate reducer polymer does not ferment in the drilling fluid, can be biologically degraded and is free from pollution to the environment, so the saturated salt filtrate reducer polymer belongs to a green environment-friendly product.

Description

technical field [0001] The invention relates to the technical field of drilling fluid systems in petrochemical oilfields, in particular to a saturated salt fluid loss reducer polymer for drilling fluids. Background technique [0002] At present, there is less and less shallow crude oil in the world, and the mining depth is getting deeper and deeper, but there is still a shortage of drilling aids for deep and ultra-deep wells. At present, some products on the market are only resistant to high temperature but not to salt, or are excessively viscosified, and other auxiliary materials need to be added to allow drilling to proceed normally. Therefore, the market urgently needs a product that can effectively It is a petroleum drilling aid that reduces the fluid loss of drilling mud and does not increase viscosity. Contents of the invention [0003] The object of the present invention is to provide a saturated salt fluid loss reducer polymer for drilling fluid. [0004] The pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 柳云涛
Owner ANHUI LUHAI PETROLEUM AUX TECH
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