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A plugging agent, drilling fluid containing the plugging agent, and preparation method and application thereof

A plugging agent and drilling fluid technology, which is applied in the field of drilling fluid and its preparation, can solve the problems of poor plugging effect, high density of plugging agent, and large damage to the reservoir, so as to achieve a small degree of damage, prevent the collapse of the reservoir, good blocking effect

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a plugging agent, a drilling fluid containing the plugging agent and its preparation method and application, which are used to solve the problems of high density of the plugging agent, poor plugging effect, and greater damage to the reservoir in the prior art. technical flaw

Method used

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  • A plugging agent, drilling fluid containing the plugging agent, and preparation method and application thereof
  • A plugging agent, drilling fluid containing the plugging agent, and preparation method and application thereof
  • A plugging agent, drilling fluid containing the plugging agent, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Preparation of emulsified paraffin

[0027] Use the anionic surfactant OP-20 and the nonionic surfactant polyethylene glycol to emulsify the paraffin wax. The emulsification temperature is controlled at about 90°C, the emulsification time is about 2 hours, and the stirring rate is about 9000r / min. Emulsified paraffin wax with a diameter of ≤100 μm; the mass content of the components with a particle diameter of less than 1 μm in the emulsified paraffin wax is about 10%, the mass content of components with a particle diameter of 1-10 μm is about 45%, and the components with a particle diameter of more than 10 μm The mass content is about 45%.

[0028] 2. Preparation of acid-soluble mixed salt

[0029] After mixing 0.5 parts by weight of 500 mesh calcium carbonate, 1 weight part of 600 mesh calcium carbonate, 1.5 parts by weight of 800 mesh calcium carbonate and 2 parts by weight of 1200 mesh calcium carbonate, with 2 parts by weight of potassium formate and 3 parts by...

Embodiment 2

[0036] 1. Preparation of emulsified paraffin

[0037] Use anionic surfactant OP-25 and nonionic surfactant polyvinyl alcohol to emulsify paraffin wax. The emulsification temperature is controlled at about 95°C, the emulsification time is about 1.5 hours, and the stirring rate is about 10000r / min. Emulsified paraffin wax of ≤100 μm; the mass content of components with a particle size of less than 1 μm in the emulsified paraffin wax is about 10%, the mass content of components with a particle size of 1-10 μm is about 50%, and the mass content of components with a particle size of more than 10 μm The mass content is about 40%.

[0038] 2. Preparation of acid-soluble mixed salt

[0039] After mixing the 500 mesh calcium carbonate of 1.5 parts by weight, the 600 mesh calcium carbonate of 2 parts by weight, the 800 mesh calcium carbonate of 3 parts by weight and the 1200 mesh calcium carbonate of 3.5 parts by weight, with 3 weight parts of sodium formate and 5 parts by weight of P...

Embodiment 3

[0046] 1. Preparation of emulsified paraffin

[0047] Use the anionic surfactant OP-20 and the nonionic surfactant polyethylene glycol to emulsify the paraffin wax. The emulsification temperature is controlled at about 85°C, the emulsification time is about 2 hours, and the stirring rate is about 9500r / min. Emulsified paraffin wax with a diameter of ≤100 μm; the mass content of components with a particle diameter of less than 1 μm in the emulsified paraffin wax is about 10%, the mass content of components with a particle diameter of 1-10 μm is about 40%, and the component with a particle diameter of more than 10 μm The mass content is about 50%.

[0048] 2. Preparation of acid-soluble mixed salt

[0049] After mixing the 500 mesh calcium carbonate of 1.5 parts by weight, the 600 mesh calcium carbonate of 3 parts by weight, the 800 mesh calcium carbonate of 4.5 parts by weight and the 1200 mesh calcium carbonate of 6 parts by weight, with 3 weight parts of sodium formate and 7...

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Abstract

The invention provides a blocking agent, a drilling fluid containing the blocking agent, and a preparation method of the drilling fluid and an application of the blocking agent. The blocking agent comprises 2-5 parts by weight of emulsified paraffin and 10-25 parts by weight of acid-soluble mixed salt. The particle size of the emulsified paraffin is no higher than 100[mu]m, and the particle size of the acid-soluble mixed salt is no higher than 30[mu]m. The acid-soluble mixed salt comprises, by weight, 5-15 parts of calcium carbonate, 2-3 parts of formate and 3-7 parts of chloride salt. The drilling fluid comprises, by weight, 0.1-1.5 parts of xanthan gum, 0.5-2 parts of a fluid loss additive, 0.1-1 part of high-viscosity polyanionic cellulose, 0.1-1 part of low-viscosity polyanionic cellulose, 1-3 parts of an organic amine-based inhibitor, 70-88 parts of water and 12-30 parts of the blocking agent. The drilling fluid has the advantages of low density and good fluidity, such that drilling speed can be improved, and drilling period can be shortened. The drilling fluid has a good blocking effect upon a gas reservoir, and causes low damage to the reservoir. The drilling fluid is especially suitable for carrying out effective blocking upon a tight gas reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a plugging agent, a drilling fluid containing the plugging agent, a preparation method and application thereof. Background technique [0002] The Sulige Gas Field is located in the Ordos Basin. It is the largest gas field on land in my country and a typical representative of tight sandstone gas reservoirs. The tight gas reservoirs in the Sulige gas field have low porosity, small throat radius and uneven distribution, relatively poor sorting and permeability, and the main particle size of sandstone is in the range of 0.3-1.0 mm; The mineral content and clay mineral content of the gas reservoir are relatively high, and the 24h expansion rate of the mud shale samples is above 15%, up to 35%, which is prone to damage such as solid blockage, water sensitivity, water lock, etc., so reduce foreign solids , Liquid ingress is critical to protecting the reservoir. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12C09K8/506C09K8/514
Inventor 李波陆红军巨满成吴学升高云文赵巍张燕娜黄占盈周文军王彦博段志锋余世福王勇茗欧阳勇
Owner PETROCHINA CO LTD
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