Unlock instant, AI-driven research and patent intelligence for your innovation.

Modified filtrate reducer for petroleum drilling fluid

A technology of oil drilling and fluid loss reducer, which is applied in the field of oil drilling, can solve the problems of limited temperature resistance and salt resistance, and achieve the effect of improving high temperature resistance

Active Publication Date: 2021-05-07
库尔勒郑豫石油物资有限公司
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature resistance and salt resistance are usually limited, and are mainly used in drilling operations below 110 °C

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modified filtrate reducer for petroleum drilling fluid
  • Modified filtrate reducer for petroleum drilling fluid
  • Modified filtrate reducer for petroleum drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Preparation of amino-terminated hyperbranched polymer: add diethylenetriamine in the reaction flask and place it in an ice-water bath environment, continuously feed nitrogen into the reaction flask, and mix equimolar methyl acrylate with methanol dropwise. added to the reaction, after the dropwise addition was completed, stirred at room temperature for 4 h, rotary-evaporated to remove methanol, and then the reaction flask was placed in an oil bath for polycondensation to obtain an amino-terminated hyperbranched polymer;

[0032] 2) Preparation of carboxylated cellulose: add the alkalized cellulose with sodium hydroxide into the reaction flask, add the prepared chlorosulfonic acid and chloroform (m:m=2.5:1) under the condition of a constant temperature water bath at 40° C. Sulfonation reaction to obtain sodium cellulose sulfonate; catalyst perchloric acid (10ml) and the sodium cellulose sulfonate (100mg) and maleic anhydride (1g) were added to the reaction flask, and e...

Embodiment 2

[0034] Example 2: Preparation of modified humic acid

[0035] A 4% potassium persulfate aqueous solution was added to the reaction flask containing 10 g of humic acid, the reaction flask was placed in an environment of 80 °C, and 5 g of sodium p-styrenesulfonate and 5 g of 2-acrylamide-2-methyl were slowly added dropwise under stirring conditions. The mixed monomer aqueous solution of propyl propanesulfonic acid is added dropwise, and the reaction is kept for 3 hours after the completion of the dropwise addition to obtain the modified humic acid.

Embodiment 3

[0036] Example 3: Preparation of quaternized chitosan

[0037]Add 5g of chitosan and 50ml of isopropanol into the reaction flask, stir at 65°C for 15min, then heat up to 85°C, slowly add 60ml of glycidyl trimethylammonium chloride solution (mass fraction is 40%) dropwise, The reaction was performed at a constant temperature for 12 h, and after the reaction was completed, it was filtered, washed and dried to obtain quaternized chitosan;

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a modified filtrate reducer for petroleum drilling fluid, and the filtrate reducer is prepared by blending 30-50 parts of cellulose-based hyperbranched polymer, 20-30 parts of modified humic acid and 10-20 parts of quaternized chitosan in 80-150 parts of water, adding 5-10 parts of silane coupling agent and 1-3 parts of surfactant, and dispersing at a high speed. The filtrate reducer prepared by modifying natural high polymer materials such as cellulose, humic acid and chitosan has the functions of resisting high temperature of 260 DEG C, resisting salt and resisting calcium, can effectively reduce the filter loss of the drilling fluid, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a modified fluid loss reducing agent for oil drilling fluid. Background technique [0002] Fluid loss reducer is an indispensable additive in oil drilling. It plays the role of stabilizing colloidal particles, increasing filtrate viscosity and plugging pores in oil drilling. Fluid loss reducer can bring a higher negative charge density to the surface of clay particles, increase the potential of the surface of clay particles, and form a thicker hydration film under the hydration of hydrophilic groups, so that the clay particles remain stable. Not easy to coalesce. Polymer fluid loss reducer will increase the viscosity of the filtrate, and the increase in the viscosity of the filtrate will lead to a decrease in the filtrate of the drilling fluid, but the increase in the viscosity of the drilling fluid may also lead to a decrease in the drilling rate, which is not in line with...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G81/00C08B3/12C08B1/08C08B15/05C08G73/02C08F289/00C08F212/14C08F220/58C08B37/08
CPCC09K8/035C08G81/00C08B3/12C08B1/08C08B15/05C08G73/028C08F289/00C08B37/003C08F212/30C08F220/585
Inventor 封娜党恒王元有华丽胡博闻
Owner 库尔勒郑豫石油物资有限公司