High-calcium-salt drilling fluid with high temperature resistance and preparation method thereof

A drilling fluid, high temperature resistance technology, applied in the field of drilling, can solve the problems of insufficient temperature resistance, high temperature and high pressure filtration loss difficult to control, etc., to solve the problem of swelling dispersion and collapse, suspension stability and collapse resistance, strong page rock-inhibiting effect

Active Publication Date: 2018-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art such as insufficient temperature resistance under high calcium salt conditions and difficult control of high te

Method used

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  • High-calcium-salt drilling fluid with high temperature resistance and preparation method thereof
  • High-calcium-salt drilling fluid with high temperature resistance and preparation method thereof
  • High-calcium-salt drilling fluid with high temperature resistance and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0070] Preparation of anti-calcium fluid loss reducer A:

[0071] (1) Add 10g N-vinylformamide, 6g acrylamide, 80g 2-acrylamido-2-methylpropanesulfonic acid, 2.5g acrylic acid, 1.5g methyl methacrylate into 150g deionized water, and use 40g 40% sodium hydroxide solution adjusts the pH value at 8 to obtain mixed solution A, and the total concentration of monomers in mixed solution A is 34.5%

[0072] (2) Add 0.3g xanthan gum in mixed solution A, pass N 2 After 0.5 hour, mixed solution B was obtained, wherein xanthan gum was 0.1% by weight of mixed solution B.

[0073] (3) Add 0.05 g of initiator ammonium persulfate and sodium bisulfite and 0.3 g of complexing agent disodium edetate to mixed solution B at 50° C., and react for 3 hours to obtain a gel-like product, wherein The amount of initiator is 0.1% of the total weight of the monomers; disodium edetate is 0.1% of the weight of the mixed solution B.

[0074] (4) Shearing and granulating the gel product, drying at 85° C. f...

Embodiment 1

[0123] The density is 1.1g / cm 3 The distribution ratio of drilling fluid components is as follows based on 100 parts by weight of water:

[0124]

[0125] The specific preparation process is as follows:

[0126] (1) Under stirring, disperse sodium bentonite and attapulgite in water, and place at room temperature for more than 24 hours; (2) Add calcium oxide and sodium hydroxide aqueous solution, and stir at high speed for 5 minutes; (3) Under high stirring, slowly add Anti-calcium fluid loss additive A, anti-calcium fluid loss additive B, high-speed stirring for 30 minutes, until the fluid loss additive polymer is completely dissolved; (4) under high stirring, add dispersant, sulfonated phenolic resin, asphalt Slumping agent and lubricant, stir at high speed for 10 minutes; (5) Add potassium chloride first under high stirring, then add calcium chloride after it is completely dissolved, add barite after stirring at high speed for 20 minutes, and stir for another 10 minutes....

Embodiment 2

[0132] The density is 1.8g / cm 3 The distribution ratio of drilling fluid components is as follows based on 100 parts by weight of water:

[0133]

[0134] Concrete preparation process is with embodiment 1.

[0135] Prepare high-calcium salt drilling fluid according to the above process, pour it into the aging tank, roll it at 150°C for 16 hours, then cool down, measure the rheological properties with a six-speed viscometer at 50°C, and then measure the medium pressure filtration loss and high temperature and high pressure filtration. loss of quantity. The performance of the high calcium drilling fluid with the above composition ratio is as follows:

[0136] Table 2

[0137]

[0138] As can be seen from the above results, the 1.78g / cm2 calcium chloride 4% of the present invention 3 Density high-calcium drilling fluid, after aging at 150°C for 16 hours, has a plastic viscosity of 71mPa.s, medium-pressure fluid loss of 1.6mL, and high-temperature and high-pressure fluid...

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Abstract

The invention discloses a high-calcium-salt drilling fluid with high temperature resistance and a preparation method thereof. The drilling fluid comprises, by weight, 100 parts of water, 0.8 to 3 parts of clay minerals, 0.3 to 2 parts of calcium oxide, 0.5 to 1.5 parts of sodium hydroxide, 0.3 to 2 parts of an anti-calcium filtrate reducer A, 1 to 5 parts of an anti-calcium filtrate reducer B, 0.5to 4 parts of a dispersant, 2 to 6 parts of sulfonated phenolic resin, 1 to 4 parts of an asphalt anti-collapse agent, 1 to 5 parts of a lubricant, 0 to 20 parts of potassium chloride, 4 to 15 partsof calcium chloride and 0 to 300 parts of a weighting agent. The high-calcium-salt drilling fluid of the invention has anti-sloughing ability, good rheological properties and suspension stability, andlow filtrate loss at high temperature and high pressure, and is applicable to drilling construction of high-calcium-salt water formations and formations prone to collapse.

Description

technical field [0001] The invention relates to the technical field of drilling, and more particularly relates to a high-temperature-resistant high-calcium salt drilling fluid and a preparation method thereof. Background technique [0002] In the exploration and development of oil and gas, salt-gypsum layers and brine layers are often drilled, which has a great impact on the performance of drilling fluids, especially when formation water with high calcium and magnesium ions invades drilling fluids, resulting in rheology and fluid loss of drilling fluids The loss of control of performance such as volume not only seriously affects the speed of drilling operations, but also greatly increases the safety risk of the project. [0003] The damage of high-valent metal ions such as calcium and magnesium to the performance of drilling fluid is mainly due to their serious impact on slurry-making soil and high-molecular polymer treatment agents. Ca 2+ It can be strongly adsorbed on th...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/24
CPCC09K8/16C09K8/24C09K2208/34
Inventor 王琳杨小华金军斌林永学崔龙兵王海波何剑钱晓琳张国李雄
Owner CHINA PETROLEUM & CHEM CORP
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