High temperature resistant anti-salt solid-free environment protection drilling and completing fluids

A solid phase-free, drilling and completion technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of complex chemical composition, influence on cementing quality, poor cement compatibility, etc.

Active Publication Date: 2008-07-30
PETROSTAR OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the complex chemical composition of some drilling fluid systems, the compatibility with cement is poor, which affects the subsequent cementing quality

Method used

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Embodiment Construction

[0004] The specific implementation manners of the present invention will be described in detail below in combination with actual conditions.

[0005] Provided by the above-mentioned technical scheme, when the present invention is implemented, the drilling and completion fluid is made of water, formate, viscosifier, fluid loss reducer, oil layer protection agent and polyalcohol anti-slump agent, wherein the water Combined with formate to form a weighted base fluid (also known as drilling and completion base fluid, the same below), the amount of water and formate added is limited by the specific gravity or density, and the specific gravity (density) of the weighted base fluid is 1.05-1.802 (g / cm 3 ), that is, per cubic centimeter (cm 3 ) aggravated base fluid, that is, the weight of formate brine is 1.05-1.802g (1.05-1.802g / cm 3 ), wherein the weight of the formate is 0.1g-1.3g, after the weighted base liquid is made, add respectively 0.4-0.6% of the thickening agent of the wei...

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Abstract

The invention relates to a high temperature resistant salt-resistant no-solid-phase environment-friendly well completion drilling fluid, which can effectively overcome the shortcomings in the performance and the application of the prior well completion drilling fluid, in particular can avoid damage to stratum, and can meet the strict requirements for environment protection. The invention has the technical proposal that the well completion drilling fluid is made up from water, formate, viscosity increaser, filtration loss reducing agent, oil layer protective solute and polymeric-alcohol collapse preventing agent. The well completion drilling fluid is ensured to contain no solid-phase component, reduces the damage to the stratum greatly, has fine structural components, not only optimizes the overall performances of the system, but also improves the stability of heat resistance and salt resistance of the system. The constituents adopted by the invention are all water-soluble substances, the pollution on the environment caused by emissions is reduced, the system also can be recovered and recycled, and high-priced fluid preparing cost can be reduced greatly.

Description

1. Technical field [0001] The present invention mainly relates to oil drilling and completion working fluid with optimized performance, especially a high temperature resistant (200°C), salt resistant, solid-phase pollution-free and easy-to-degrade environment-friendly drilling and completion fluid with high temperature resistance, salt resistance and solid phase liquid. 2. Background technology [0002] In the current oil exploration and development process, due to their own characteristics, conventional water-based mud or oil-based mud often cause irreparable damage to the reservoir especially during the drilling process, so that the exploration and later development can draw wrong conclusions , which increases unnecessary and high treatment costs; at the same time, the commonly used barite weighting agent itself is insoluble and potentially harmful, which also leads to the high cost of waste drilling fluid discharge and treatment. Especially at high temperature, the solid...

Claims

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Application Information

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IPC IPC(8): C09K8/06
Inventor 毕海林原玉锁
Owner PETROSTAR OIL TECH
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