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A kind of emulsified drilling fluid with high density and low oil-water ratio for shale horizontal well

An emulsified drilling fluid and horizontal well technology, applied in the field of petroleum drilling, can solve the problems of high cost, collapse and instability of oil-based drilling fluid, etc., and achieve the effects of cost reduction, strong inhibition of dispersion and plugging ability, and product stability

Active Publication Date: 2019-04-23
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-density, low-oil-water-ratio emulsified drilling fluid for shale horizontal wells, which solves the problems of easy collapse and instability and high cost of full oil-based drilling fluid when drilling deep wells in unconventional formations

Method used

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  • A kind of emulsified drilling fluid with high density and low oil-water ratio for shale horizontal well
  • A kind of emulsified drilling fluid with high density and low oil-water ratio for shale horizontal well
  • A kind of emulsified drilling fluid with high density and low oil-water ratio for shale horizontal well

Examples

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Effect test

Embodiment 1

[0045] 1. A kind of emulsified drilling fluid with high density and low oil-water ratio for drilling into shale horizontal wells is made up of the following raw materials in parts by weight: 180 parts of 3# white oil, 120 parts of 30% calcium chloride solution, 3 parts of main emulsifier, 6 parts of auxiliary emulsifier, 15 parts of reversible emulsifier, 9 parts of calcium oxide, 3 parts of organic soil, 4.5 parts of plugging agent, 1 part of lifting agent, 9 parts of calcium carbonate, 750 parts of barite,

[0046] Wherein, the above-mentioned primary emulsifier is made by reacting tall oil fatty acid and maleic anhydride at a mass ratio of 100:15 at 200°C for 8 hours;

[0047] The above-mentioned co-emulsifier is prepared by mixing higher fatty acid sodium and sorbitan ester in a mass ratio of 1:3;

[0048] The above-mentioned reversible emulsifier is made by reacting methyl 9-octadecanoate and hydroxyethylethylenediamine at a mass ratio of 3:2 at a temperature of 135°C for...

Embodiment 2

[0055] A high-density, low-oil-water-ratio emulsified drilling fluid for drilling shale horizontal wells, consisting of the following raw materials in parts by weight: 180 parts of 3# white oil, 120 parts of 30% calcium chloride solution, 5 parts of main emulsifier, and auxiliary emulsifier 8 parts of emulsifier, 18 parts of reversible emulsifier, 5 parts of calcium oxide, 2 parts of organic soil, 3 parts of plugging agent, 0.5 part of cutting agent, 6 parts of calcium carbonate, 600 parts of barite, of which, the main emulsifier, auxiliary emulsifier The preparation of emulsifier, reversible emulsifier, plugging agent, and cutting agent is the same as in Example 1, and the organic soil and calcium carbonate are the same as in Example 1. The method for preparing emulsified drilling fluid with high density and low oil-water ratio for drilling shale horizontal wells With embodiment 1.

Embodiment 3

[0057] A high-density, low-oil-water-ratio emulsified drilling fluid for drilling shale horizontal wells, consisting of the following raw materials in parts by weight: 180 parts of 3# white oil, 120 parts of 30% calcium chloride solution, 2 parts of main emulsifier, and auxiliary emulsifier 4 parts of reversible emulsifier, 12 parts of reversible emulsifier, 10 parts of calcium oxide, 5 parts of organic soil, 8 parts of plugging agent, 3 parts of cutting agent, 12 parts of calcium carbonate, 450 parts of barite, of which, the main emulsifier, auxiliary emulsifier The preparation of emulsifier, reversible emulsifier, plugging agent, and cutting agent is the same as in Example 1, and the organic soil and calcium carbonate are the same as in Example 1. The method for preparing emulsified drilling fluid with high density and low oil-water ratio for drilling shale horizontal wells With embodiment 1.

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Abstract

The invention discloses an emulsion drilling fluid with high density and low oil-water ratio for a shale horizontal well. The emulsion drilling fluid is prepared from raw materials in parts by weight as follows: 180 parts of 3# white oil, 120 parts of a 30% calcium chloride solution, 2-5 parts of a main emulsifier, 4-8 parts of an auxiliary emulsifier, 12-18 parts of a reversible emulsifier, 5-10 parts of calcium oxide, 2-5 parts of organic soil, 3-8 parts of a blocking agent, 0.5-3 parts of an extracting agent, 6-12 parts of calcium carbonate and 0-800 parts of barytes, wherein the main emulsifier is prepared from tall oil fatty acid and maleic anhydride, the auxiliary emulsifier is prepared from high-level fatty acid salt and high-level fatty acid polyol ester, the reversible emulsifier is prepared from methyl 9-octadecenoate and hydroxyethyl ethylenediamine, and the extracting agent is prepared from styrene, methyl methacrylate and hexadecyl acrylate. The oil-water ratio is 6:4, and the emulsion drilling fluid has higher inhibition dispersibility and blocking capacity, good lubricating property and good heat-resisting property and can be suitable for meeting the drilling requirement of a horizontal section of the shale deep well.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, in particular to a high-density, low-oil-water-ratio emulsified drilling fluid for shale horizontal wells. Background technique [0002] As the development of various oilfields in the world gradually enters the middle and later stages, especially for the drilling of shale gas horizontal wells, there are many complicated situations encountered during the drilling process, such as excessive torque, resistance when tripping, and ROP Problems such as low and wellbore instability have led to a sharp increase in the difficulty of drilling operations and development costs. The traditional way to solve these problems in foreign drilling is to use oil-based drilling fluid. Oil-based drilling fluid has excellent properties of high temperature resistance, salt resistance and calcium intrusion resistance, which is conducive to wellbore stability, good lubricity, and less damage to oil and gas laye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36
CPCC09K8/36
Inventor 李伟王波李红梅张文哲王涛杨超钟亚军
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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