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Water retaining composition for cement for oil well

A fluid loss agent and oil well cement technology, applied in drilling equipment and other directions, can solve the problems that the rheological properties of the cement slurry cannot meet the requirements, the low shear viscosity of the cement slurry increases, and the pumping performance deteriorates, so as to facilitate transportation and Field operation, the effect of improving rheological properties and improving temperature resistance

Inactive Publication Date: 2005-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method improves the shortcomings of the above-mentioned physical cross-linked polyvinyl alcohol fluid loss reducer, the product concentration is low, the transportation cost is high, and the low-shear viscosity of the cement slurry increases significantly after the addition, resulting in the rheological properties of the cement slurry cannot meet Requirements, poor pumping performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Weigh 100 grams of polyvinyl alcohol (brand name PVA 1788, molecular weight 160,000, degree of hydrolysis 88%), place in 1200 grams of water, and heat to dissolve. At 40°C, add 0.15g of glutaraldehyde, stir and mix for 1 hour, add 25ml of 1mol / L hydrochloric acid solution, stir vigorously at 50°C for 2 hours, then add a small amount of bactericide to make slightly cross-linked PVA latex, theoretically The degree of cross-linking is 0.066%, the solution concentration is 7.6%, and the code name is Latex 1.

example 2

[0023] Weigh 100 grams of PVA 1788, place in 880 grams of water, and heat to dissolve. At 50°C, add 0.125g of glutaraldehyde, stir and mix for 1 hour, add 20 ml of 1mol / L hydrochloric acid solution, stir vigorously at 50°C for 2 hours, then add a small amount of bactericide to make slightly cross-linked PVA latex, The theoretical crosslinking degree is 0.055%, the solution concentration is 10%, and the code name is Latex 2.

example 3

[0025] Weigh 100 grams of PVA 1788, place in 1300 grams of water, and heat to dissolve. At 60°C, add 0.2g of glutaraldehyde, stir and mix for 1 hour, add 25 ml of 1mol / L hydrochloric acid solution, stir vigorously at 50°C for 2 hours, then add a small amount of bactericide to make slightly cross-linked PVA latex, The theoretical cross-linking degree is 0.088%, the solution concentration is 7%, and the code name is Latex 3.

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Abstract

The invention relates to a fluid loss reducing agent composition for oil well cement. The fluid loss reducing agent is used for reducing the water loss of cement slurry during oil and natural gas drilling and cementing. The composition comprises: 1) water; 2) polyvinyl alcohol with a cross-linking degree of 0.005-0.5 percent; 3) sulfonated acetone-formaldehyde condensate 0.5-3 times the weight of polyvinyl alcohol. The fluid loss reducing agent composition provided by the invention has good fluid loss reducing performance and rheological performance, and the concentration of polyvinyl alcohol can be up to 15%, which can greatly reduce transportation cost.

Description

technical field [0001] The invention relates to a fluid loss reducing agent composition for oil well cement. The fluid loss reducing agent is used for reducing the water loss of cement slurry during oil and natural gas drilling and cementing. Background technique [0002] Cement fluid loss reducing agent can enhance the water retention effect of cement slurry in oil well cementing construction, improve the displacement efficiency of cementing operation, prevent the cement slurry from dehydration in permeable formation, ensure the stability of cement slurry, and improve the solidification of cement stone. Strength, prevent gas channeling, improve the impermeability of the cement sheath, protect water-sensitive formations, prevent cement slurry filtrate from polluting oil and gas layers and cement slurry particles from clogging oil and gas layers. [0003] Cellulose derivatives, such as hydroxyethyl cellulose (HEC), are the most commonly used cementing cement fluid loss reduci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
Inventor 陈涓彭朴汪燮卿
Owner CHINA PETROLEUM & CHEM CORP
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