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Anti-collapse plugging agent for drilling fluid and preparation method and application thereof

A plugging agent and anti-slump technology, applied in the fields of mining, oil and natural gas exploration, can solve the problems of easy foaming, can not meet the anti-slump drilling fluid, and the viscosity of the drilling fluid increases, and achieves good effect, good plugging performance, The effect of low fluorescence intensity

Active Publication Date: 2016-04-20
SONGYUAN MARINE PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, asphalt-based plugging agents have a high level of fluorescence, and their use in exploratory wells will be limited, so asphalt-based plugging agents are limited to use in production wells in areas with low environmental protection requirements; while paraffin-based and polyol-based plugging agents However, it is easy to foam and cause the viscosity of the drilling fluid to increase significantly, and it cannot meet the needs of the anti-slump drilling fluid.

Method used

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  • Anti-collapse plugging agent for drilling fluid and preparation method and application thereof
  • Anti-collapse plugging agent for drilling fluid and preparation method and application thereof
  • Anti-collapse plugging agent for drilling fluid and preparation method and application thereof

Examples

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Embodiment 1

[0032] This embodiment provides a method for preparing an anti-collapse plugging agent for drilling fluid, wherein the method specifically includes the following steps:

[0033] a. Add 0.3 mole of sodium sulfite to 60 mL of water to dissolve completely, add 0.5 mole of dimethylamine and 1 mole of formaldehyde to the aqueous solution, and react at 80°C for 120 minutes to obtain the addition product;

[0034] b. Add 1 mole of phenol and 0.05 mole of formaldehyde into the reaction kettle, heat up to 90°C and react for 180 minutes;

[0035] C, add the alkaline catalyst sodium hydroxide of 0.001 mole in reactor;

[0036] d. Add 0.05 moles of the addition product described in step a to the reactor, and keep the temperature at 90°C for 200 minutes;

[0037] e. After the reaction, cool down and discharge, dry at 50°C, and pulverize to obtain an anti-slump plugging agent for drilling fluid with a particle size of 80 mesh, which is designated as FT-SDRJ-1.

Embodiment 2

[0039] This embodiment provides a method for preparing an anti-collapse plugging agent for drilling fluid, wherein the method specifically includes the following steps:

[0040] a. Add 1 mole of potassium sulfite to 200 mL of water to dissolve completely, add 0.8 mole of dimethylamine, 1 mole of a mixture of formaldehyde and acetaldehyde to the aqueous solution, and react at 100°C for 100 minutes to obtain an addition product;

[0041] b. Add 1 mole of a mixture of phenol and cresol, and 0.9 moles of a mixture of formaldehyde and acetaldehyde into the reaction kettle, raise the temperature to 150°C and react for 120 minutes;

[0042] C, add the alkaline catalyst potassium hydroxide of 0.6 mole in reactor;

[0043] d. Add 1 mole of the addition product described in step a to the reactor, and keep the temperature at 150°C for 150 minutes;

[0044] e. After the reaction, cool down and discharge the material, dry at 100°C, and pulverize to obtain an anti-slump plugging agent for ...

Embodiment 3

[0046] This embodiment provides a method for preparing an anti-collapse plugging agent for drilling fluid, wherein the method specifically includes the following steps:

[0047] a. Add 1.6 moles of sodium sulfite, potassium sulfite, and sodium bisulfite to 320 mL of water to dissolve completely, add 1.2 moles of dimethylamine, 1 mole of paraformaldehyde and furfural to the aqueous solution, and react at 90°C for 110 minutes. Addition products are obtained;

[0048] b. Add 1 mole of a mixture of xylenol and resorcinol and 1.5 moles of acetaldehyde into the reaction kettle, heat up to 120°C and react for 150 minutes;

[0049] C, add the mixture of the alkali catalyst ammoniacal liquor of 1.2 moles and barium hydroxide in reactor;

[0050] d. Add 1.5 moles of the addition product described in step a to the reactor, and keep the temperature at 120°C for 180 minutes;

[0051] e. After the reaction, cool down and discharge the material, dry at 80°C, and pulverize to obtain an anti...

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Abstract

The invention provides an anti-collapse plugging agent for drilling fluid and a preparation method and application thereof. The preparation method of the plugging agent includes the following steps that a, sulfite and / or hydrosulfite are / is added into water to be completely dissolved, a solution A is obtained, dimethylamine and aldehydes substances are added into the solution A, reaction is achieved through heating, and additive products are obtained; b, phenolic substances and aldehydes substances are mixed and heated to react, and a solution B is obtained; c, an alkali catalyst is added into the solution B, and a solution C is obtained; d, the additive products obtained in step a are added into the solution C obtained in the step c and made to react, and the anti-collapse plugging agent is obtained through drying after the reaction ends. The anti-collapse plugging agent is a novel anti-collapse plugging agent and has the advantages that fluorescent strength is low, the plugging performance at high temperature is good, viscosity and denseness are not increased, compatibility performance between the anti-collapse plugging agent and drilling fluid is good, and the reservoir protective effect is good.

Description

technical field [0001] The invention relates to an anti-slump plugging agent for drilling fluid and a preparation method and application thereof, belonging to the technical field of petroleum and natural gas exploration and exploitation. Background technique [0002] Wellbore stability in shale is a common and serious problem in drilling engineering. Anti-slump drilling fluid technology has always been an important research direction of shale wellbore stabilization technology. The statistical results of hundreds of wells at home and abroad show that the shale formations drilled account for 70% of the total formations drilled, and more than 90% of the well collapses occurred in the shale formations. When drilling into a hard and brittle shale formation, under the action of pressure difference, capillary force and chemical potential difference, the drilling fluid filtrate will enter the formation along the micro-fractures, causing the clay minerals to hydrate and expand, ther...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/42E21B33/13C08G14/073
CPCC08G14/06C09K8/035C09K8/426C09K2208/18E21B33/13
Inventor 李玉梅
Owner SONGYUAN MARINE PETROLEUM TECH CO LTD
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