Salt-resistant filtrate loss reducer for grafted starch drilling fluid

A technology of grafting starch and fluid loss reducer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems affecting the stability of oil and gas formations and product quality, high equipment investment and raw material costs, and liquid phase infiltration of drilling fluids. formation and other problems, to achieve the effect of being beneficial to the control of the process, improving the drilling efficiency and oil quality, and improving the solubility

Inactive Publication Date: 2015-04-22
HEBEI GUANGDA PETROCHEM
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  • Abstract
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Problems solved by technology

[0002]During the oil exploitation process, due to the high downhole temperature and pressure of deep and ultra-deep wells, the formation structure is relatively complex, and high pressure oil and gas layers and brine layers are often encountered during drilling. The liquid phase of the drilling fluid will seep into the formation, affecting the stability of the oil and gas reservoir and the quality of the product. At present, the effective way to solve this problem is to add fluid loss control agent to the drilling fluid. The quality of the fluid loss control agent greatly affects the drilling efficiency. and quality
[0003] Chinese patent "Preparation Method of Fluid Loss Control Agent for Drilling Fluid" (Patent No. ZL200910113490.5) discloses an anti-fluid loss Sodium phosphate, etherified starch, hydroxyethyl cellulose, polyacrylamide and water-soluble silicone oil are used as raw materials for synthesis. This method has complex process, poor temperature resistance, high equipment investment and raw material costs, and a large amount of waste liquid discharge. Conducive to environmental protection

Method used

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  • Salt-resistant filtrate loss reducer for grafted starch drilling fluid
  • Salt-resistant filtrate loss reducer for grafted starch drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The raw materials of embodiment 1 are selected: acrylamide 2400kg, 2-acrylamide-2-methylpropanesulfonic acid 50kg, soda ash 240kg, starch 1500kg.

[0027] The preparation process of the present embodiment is:

[0028] Step (1) Raw material preparation: Prepare acrylamide aqueous solution and soda ash aqueous solution respectively. The total mass of water used is 3-5 times the mass of acrylamide. After the preparation is completed, mix the two aqueous solutions to obtain a feed liquid. After adding to the reactor, close the reaction Nitrogen is fed into the kettle valve, and then an auxiliary agent is added; the consumption of the auxiliary agent is 0.5% of the acrylamide quality, and the auxiliary agent is potassium persulfate;

[0029] Step (2) Polymerization reaction: Initiate at a low temperature of 5-11°C, without temperature control to 60-90°C;

[0030] Step (3) Hydrolysis reaction: After the polymerization reaction, keep the temperature in the kettle at 60°C-90°C...

Embodiment 2-7

[0041] The difference between Examples 2-7 and Example 1 lies in the raw materials and proportioning ratio, and the proportioning ratio is in kg, see Table 2 for details.

[0042] The raw material of table 2 embodiment 2-7 and proportioning

[0043]

[0044] The anti-salt and dehumidifying agent of this embodiment is non-toxic, harmless to the environment and the human body, and its safety index conforms to the International Material Safety Data Sheet (MSDS).

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Abstract

The invention relates to a salt-resistant filtrate loss reducer for a grafted starch drilling fluid. The salt-resistant filtrate loss reducer is prepared from acrylamide, 2-acrylamide-2-methyl propane sulfonic acid, sodium carbonate and starch as raw materials by the processes of raw material preparation, polymerization reaction, hydrolysis reaction and modified drying. The salt-resistant filtrate loss reducer has the advantages of relatively high compatibility, relatively high filtration reducing ability in fresh water, saline water, saturated salt water and composite saltwater drilling fluid, and high-temperature resistance; and the drilling efficiency and the oil quality can be effectively improved.

Description

technical field [0001] The invention belongs to the field of petrochemicals, in particular to a salt-resistant fluid loss reducer for grafted starch drilling fluid. Background technique [0002] In the process of oil exploitation, due to the high downhole temperature and pressure in deep wells and ultra-deep wells, and the complex formation structure, high-pressure oil and gas layers and saline layers are often encountered during drilling, which leads to the liquid phase penetration of drilling fluid into the formation, affecting the stability and production of oil and gas layers. Quality, the current effective way to solve this problem is to add fluid loss control agent to the drilling fluid, the quality of fluid loss control agent greatly affects the efficiency and quality of drilling. [0003] The Chinese patent "A Preparation Method of Fluid Loss Control Agent for Drilling Fluid" (Patent No. ZL200910113490.5) discloses an anti-fluid loss agent, which consists of sodium h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F291/12C08F291/00C08F220/58C08F120/56
CPCC08F8/12C08F120/56C08F291/00C09K8/035C08F220/585
Inventor 李尚坤郭九成郭杨高国英罗前程刘君君张宇航张星赤艳峰
Owner HEBEI GUANGDA PETROCHEM
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