High temperature and anti-composite salt polymer fluid loss reducer for drilling fluid and preparation method thereof

A fluid loss reducer and high temperature resistant technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor salt resistance and high temperature resistance, and achieve good salt and calcium resistance and good temperature resistance. , the effect of good lubricating performance

Active Publication Date: 2016-03-16
KORLA TONGYI IND TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a high temperature and anti-composite salt polymer fluid loss reducer for drilling fluids and a preparation method thereof, which solves the deficiencies in the prior art. Due to the defects of salt and poor high temperature resistance, acrylic acid, acrylamide, sodium tetraphenylethylene sulfonate and N-vinylpyrrolidone (NVP) were used as modified monomers to synthesize a high temperature resistant compound salt tetrapolymer to reduce water loss. agent

Method used

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  • High temperature and anti-composite salt polymer fluid loss reducer for drilling fluid and preparation method thereof
  • High temperature and anti-composite salt polymer fluid loss reducer for drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1.1 A fluid loss reducing agent for high temperature and compound salt polymers for drilling fluids, which consists of the following raw materials in percentage by weight: 12.2% acrylic acid, 7.2% sodium hydroxide, 62.3% deionized water, 5.5% acrylamide, four Sodium styrene sulfonate 5.5%, N-vinylpyrrolidone 7%, initiator 0.3%.

[0028] Prepare 1000kg of water loss reducing agent for high temperature and compound salt polymer used in drilling fluid of the present invention, specific raw materials and consumption are: 122kg of acrylic acid, 72kg of sodium hydroxide, 623kg of deionized water, 55kg of acrylamide, tetraphenylethylene sulfonic acid 55kg of sodium, 7kg of N-vinylpyrrolidone, and 3kg of initiator, wherein the initiator is 1.5kg of ammonium persulfate and 1.5kg of sodium sulfite.

[0029] 1.2 Preparation steps:

[0030] (1) Add 130kg deionized water into the reaction kettle, stir, add ammonium persulfate and sodium sulfite, stir for 0.5h, pump into the meterin...

Embodiment 2

[0034] 2.1 A fluid loss reducing agent for high temperature and compound salt polymers for drilling fluids, which consists of the following raw materials in percentage by weight: 12.0% acrylic acid, 7.0% sodium hydroxide, 62.0% deionized water, 7.0% acrylamide, four Sodium styrene sulfonate 5.3%, N-vinylpyrrolidone 6.5%, initiator 0.2%.

[0035] Prepare 1000 kg of fluid loss reducing agent for high temperature and anti-compound salt polymer for drilling fluid of the present invention, specific raw materials and consumption are: 120 kg of acrylic acid, 70 kg of sodium hydroxide, 620 kg of deionized water, 70 kg of acrylamide, tetraphenylethylene sulfonic acid Sodium 53kg, N-vinylpyrrolidone 65kg, initiator 2kg, wherein initiator is potassium persulfate 1kg, sodium bisulfite 1kg.

[0036] 2.2 Preparation steps:

[0037] (1) Add 186kg of deionized water into the reaction kettle, stir, add potassium persulfate and sodium bisulfite, stir for 0.5h, pump into the metering tank for u...

Embodiment 3

[0041] 3.1 A fluid loss reducing agent for high temperature and compound salt polymers for drilling fluids, which consists of the following raw materials in percentage by weight: 15.0% acrylic acid, 8.5% sodium hydroxide, 60.0% deionized water, 4.0% acrylamide, four Sodium styrene sulfonate 5.6%, N-vinylpyrrolidone 6.5%, initiator 0.4%.

[0042]Prepare 1000kg of water loss reducing agent for high temperature and anti-compound salt polymer for drilling fluid of the present invention, the specific raw materials and consumption are: 150kg of acrylic acid, 85kg of sodium hydroxide, 600kg of deionized water, 40kg of acrylamide, tetraphenylethylene sulfonic acid Sodium 56kg, N-vinylpyrrolidone 65kg, initiator 4kg, wherein initiator is ammonium persulfate 2kg, sodium bisulfite 2kg.

[0043] 3.2 Preparation steps:

[0044] (1) Add 150kg deionized water into the reaction kettle, stir, add potassium persulfate and sodium bisulfite, stir for 0.5h, pump into the metering tank for use;

...

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Abstract

The invention provides a fluid loss agent for a high-temperature-resistant compound salt resistant polymer for drilling fluid and a preparation method thereof. The fluid loss agent consists of the following raw materials in percentage by weight: 10-15 percent of acrylic acid, 6-8.5 percent of sodium hydroxide, 60-65 percent of deionized water, 4-8 percent of acrylamide, 5-6 percent of tetraphenyl ethylene sodium sulfonate, 6-8 percent of N-vinyl pyrrolidone and 0.1-0.5 percent of initiator. Compared with the prior art, the fluid loss agent has the beneficial effects that the high-temperature high-pressure filter loss of the drilling fluid can be obviously reduced, and the temperature resistance and salt calcium pollution resistance of the drilling fluid system are entirely improved. Moreover, the mud cake quality is improved, a permeability recovery rate is increased, and a hydrocarbon reservoir is effectively protected. The fluid loss agent can resist high temperature of 180 DEG C and compound salts and can serve as a fluid loss agent of deep walls, drilled evaporite beds and seawater drilling.

Description

technical field [0001] The invention relates to a fluid loss reducer, in particular to a fluid loss reducer for high temperature and compound salt polymers used in drilling fluids and a preparation method thereof. Background technique [0002] As the drilling depth of oil and gas wells increases, the temperature and pressure at the bottom of the well continue to rise, and the requirements for drilling fluid treatment agents are getting higher and higher. Due to the complex strata encountered in ultra-deep wells, downhole high temperature and high pressure, and long operating periods, higher requirements are placed on drilling fluid technology. The main technical problems faced by drilling fluids for high-temperature ultra-deep wells are as follows: First, the high-temperature stability of drilling fluids is particularly prominent. Because under the action of high temperature, the main organic treatment agents in drilling fluid can gradually deteriorate, degrade and become i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/06C08F220/56C08F212/14C08F226/10
CPCC08F220/06C09K8/035C08F220/56C08F212/14C08F226/10
Inventor 宋芳
Owner KORLA TONGYI IND TRADE CO LTD
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