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Tackifier, drilling fluid containing tackifier, and stock solution of drilling fluid

A technology of viscosifier and emulsifier, which is applied in the field of drilling fluid and its reserve fluid, and viscosifier, which can solve the problems of large amount of drilling fluid and limited total capacity of offshore drilling platforms

Active Publication Date: 2014-03-12
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to open the circuit in the initial deep-water surface drilling, the amount of drilling fluid required is very large, and the total capacity of the offshore drilling platform is limited

Method used

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  • Tackifier, drilling fluid containing tackifier, and stock solution of drilling fluid
  • Tackifier, drilling fluid containing tackifier, and stock solution of drilling fluid
  • Tackifier, drilling fluid containing tackifier, and stock solution of drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the preparation of tackifier

[0022] a. Add deionized water, 3g sodium dodecylbenzenesulfonate, and 1.0g polyvinyl alcohol (model 1799) to the cleaned four-necked flask in turn;

[0023] b. Weigh 35g of methyl acrylate and 0.4g of N,N-methylenebisacrylamide in a clean beaker, and mix them evenly in the beaker;

[0024] c, take by weighing 0.15g potassium persulfate, dissolve with a little deionized water, set aside;

[0025] d. Pour 1 / 3 of the mixture of methyl acrylate and N,N-methylenebisacrylamide and 1 / 3 of the potassium persulfate solution into a four-necked flask, and connect the four-necked flask to the stirrer device, Stir for 1 hour under the conditions of nitrogen flow, rotation speed of 600r / min, and room temperature, and then heat up to a temperature of 70°C. While continuing to pass nitrogen gas, add the remaining methyl acrylate and potassium persulfate dropwise to the four-necked flask respectively. Dropping time was controlled at 2 hours...

Embodiment 2

[0026] Embodiment 2, the preparation and performance test thereof of the stock fluid that contains the drilling fluid of embodiment 1

[0027] (1) under stirring condition, add 5g sodium bentonite, 0.4g polyanionic cellulose, 0.3g xanthan gum, 2.5g thickening agent prepared in Example 1 and 0.2g passivator lemon successively in 90g South China Sea seawater acid to obtain 1# stock solution.

[0028] In 1# stock solution, the mass-number ratio of water, sodium bentonite, polyanion cellulose, xanthan gum, thickener and passivator is 90:5:0.4:0.3:2.5:0.2.

[0029] (2) under stirring condition, add 4g sodium bentonite, 0.5g polyanion cellulose, 0.4g xanthan gum, 5g embodiment 1 preparation viscosifier and 0.3g passivator citric acid successively in 85g South China Sea seawater , to obtain 2# stock solution.

[0030] In 2# stock solution, the mass-number ratio of water, sodium bentonite, polyanion cellulose, xanthan gum, thickener and passivator is 85:4:0.5:0.4:5:0.3.

[0031] (3...

Embodiment 3

[0042] Embodiment 3, the preparation and performance test thereof of the drilling fluid that contains reserve fluid

[0043] Under stirring condition, add 10g sodium bentonite, 1g polyanionic cellulose, 0.75g xanthan gum, 15g embodiment 1 viscosifier and 0.75g passivator successively in 250ml South China Sea seawater, barite increases the weight to 1.92g / cm 3 . Obtain 5# stock solution.

[0044] In 5# stock solution, the ratio of mass and number of water, sodium bentonite, polyanionic cellulose, xanthan gum, thickener and passivator prepared in Example 1 is 90:4:0.4:0.3:6:0.3 .

[0045]The activators in the 2#, 4# and 6# drilling fluids prepared below are sodium hydroxide.

[0046] (1) Mix 200ml of 5# stock solution with 168ml of South China Sea seawater without activator to obtain 1# drilling fluid with a density of 1.50g / cm 3 .

[0047] (2) 200ml of 5# stock solution and 168ml of seawater containing activator (wherein, the mass percentage of activator is 0.2%) are mixe...

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Abstract

The invention provides a tackifier, a drilling fluid containing the tackifier, and a stock solution of the drilling fluid. The tackifier is characterized by being able to be passivated and activated. The stock solution of the drilling fluid consists of water, bentonite, polyanion cellulose, xanthan gum, the tackifier and a passivator at the mass part ratio of (85-90) to (4-6) to (0.4-0.6) to (0.3-0.4) to (6-10) to (0.2-0.3). The drilling fluid consists of the stock solution, an activating agent and water at the mass part ratio of (35-85) to (0.2-0.3) to (15-16). The drilling fluid consists of a water solution of the stocking solution and the activating agent, and under the action of the reactivating agent, the passivated tackifier is activated to play a role of tackifying, thereby making up the declination of viscous force and shearing force of the drilling fluid due to dilution of a large quantity of water, and further meeting the requirements on drilling on a deep-water surface.

Description

technical field [0001] The invention relates to a viscosifier, a drilling fluid containing the viscosifier and a reserve fluid thereof, in particular to the field of petroleum exploration and development. Background technique [0002] In the process of offshore deepwater drilling, the amount of drilling fluid required for deepwater surface drilling is much greater than that required for land and shallow sea operations. Due to the complex well structure of deepwater drilling, the large surface hole size, and the use of risers and platform drilling fluid systems in offshore drilling, the required drilling fluid volume is higher than that required by other oil wells with the same underground depth. The total amount is much larger. In addition, in order to open the circuit in the initial deep-water surface drilling, the amount of drilling fluid required is very large, and the total capacity of the offshore drilling platform is limited. Therefore, in order to meet the needs of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F222/38C08F2/26C08F220/06C08F220/18C08F2/30C09K8/035C09K8/24
Inventor 李嗣贵刘科殷志明田荣剑吴彬付英军朱荣东向兴金耿铁王荐
Owner CHINA NAT OFFSHORE OIL CORP
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