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High-calcium-salt drilling fluid and preparation method thereof

A drilling fluid and high-calcium technology, applied in the field of drilling, can solve the problems of difficult control of fluid loss, deterioration of drilling fluid performance, and insufficient temperature resistance

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 that the drilling fluid has low calcium resistance, insufficient temperature resistance under high calcium conditions, and difficulty in controlling high-temperature and high-pressure fluid loss, the present invention discloses a high-calcium salt drilling fluid and a preparation method thereof. The calcium chloride content in the fluid can reach 20%, and the temperature resistance can reach 135°C. A large amount of calcium ions in the drilling fluid make it highly shale inhibiting, which can effectively solve the problems of expansion, dispersion and collapse of mud shale formations, as well as drilling problems. Deterioration of Drilling Fluid Performance in Saline Formation with High Calcium and Magnesium Ions

Method used

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  • High-calcium-salt drilling fluid and preparation method thereof
  • High-calcium-salt drilling fluid and preparation method thereof
  • High-calcium-salt drilling fluid and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0046] Preparation of anti-calcium fluid loss reducer:

[0047] (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%

[0048] (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.

[0049](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 initiator dose is 0.1% of the total weight of the monomer; disodium edetate is 0.1% of the weight of the mixed solution B;

[0050] (4) Shearing and granulating the gel product, drying at 85° C. for 10 hou...

Embodiment 1

[0084] The density is 1.3g / cm 3 The distribution ratio of drilling fluid components is as follows based on 100 parts by weight of water:

[0085]

[0086]

[0087] The specific preparation process is as follows:

[0088] (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 10% sodium hydroxide aqueous solution, and stir at high speed for 5 minutes; (3) Under high stirring, Slowly add xanthan gum and anti-calcium fluid loss reducer in sequence, and stir at high speed for 30 minutes until they are completely dissolved; Calcium carbonate, stir at high speed for 10 minutes; (5) Add calcium chloride, stir at high speed for 20 minutes, then add barite and stir for 10 minutes.

[0089] Prepare high-calcium salt drilling fluid according to the above process, pour it into the aging tank, roll it at 135°C for 16 hours, cool down, measure the rheological properties with a six-speed ...

Embodiment 2

[0098] The density is 1.6g / cm 3 The distribution ratio of drilling fluid components is as follows based on 100 parts by weight of water:

[0099]

[0100] Concrete preparation process is with embodiment 1:

[0101] 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, 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. The performance of the high calcium drilling fluid with the above composition ratio is as follows:

[0102] table 3

[0103]

[0104] As can be seen from the above results, the high-calcium drilling fluid containing 10% calcium chloride of the present invention has a plastic viscosity of 56mPa.s after aging at 135°C / 16 hours, and a medium pressure fluid loss of 2.1mL after aging. The high-pressure fluid loss is 15mL, indicating that the high-...

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Abstract

The invention discloses a high-calcium-salt drilling fluid and a preparation method thereof. The drilling fluid comprises, by weight, 100 parts of water, 1 to 5 parts of clay minerals, 0.3 to 2 partsof calcium oxide, 0.5 to 1.5 parts of sodium hydroxide, 0.1 to 1 part of a flow pattern regulating agent, 1 to 4 parts of an anti-calcium filtrate reducer, 0.5 to 4 parts of a dispersant, 2 to 6 partsof sulfonated phenolic resin, 1 to 4 parts of an asphalt anti-collapse agent, 1 to 6 parts of a lubricant, 1 to 5 parts of ultrafine calcium carbonate, 10 to 20 parts of calcium chloride and 0 to 300parts of a weighting agent. The high-calcium-salt drilling fluid of the invention has good temperature resistance, calcium salt contamination resistance, anti-sloughing ability, rheological properties and suspension stability, and low 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 field of drilling, in particular to a 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 the slurry-making soil and high-molecular polymer treatment agents. Ca 2+ It can be strongly adsorbed on the surface of clay particles or enter into the cry...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/24
CPCC09K8/16C09K8/24C09K2208/34
Inventor 杨小华林永学王琳何伟国何剑王海波董晓强高伟刘贵传
Owner CHINA PETROLEUM & CHEM CORP
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