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Clay-content-free drilling fluid

A technology without clay and drilling fluid, applied in the direction of drilling composition, chemical instruments and methods, etc., which can solve the problems of large fluid loss and reduced reservoir permeability

Active Publication Date: 2013-01-23
PETROSTAR OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the clay-free phase system, it often does not have the ability to build walls. The drilling fluid system has a large fluid loss, and its filtrate seeps into the formation and often reduces the permeability of the reservoir. How to ensure that the system has good carrying capacity at a certain temperature? It is a big technical problem to realize strong plugging performance, that is, to reduce the damage of the clay-free drilling fluid system to the reservoir

Method used

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Embodiment Construction

[0058] The purpose of the present invention is to develop a clay-free drilling fluid system that can effectively seal in low-porosity and low-permeability reservoirs. The technical solution is that the drilling fluid is composed of seawater, viscosifier, fluid loss It is composed of plugging agent, inhibitor and weighting agent, wherein seawater is the base fluid, and then viscosity increaser, fluid loss reducer, plugging agent, inhibitor, and weighting agent are added according to the ratio of the components to the base fluid. It is preferably suitable for resistance to 150°C, 1.2 and 1.5g / cm 3 Viscosifier, fluid loss reducer and plugging agent for clay-free drilling fluid system.

[0059] The specific implementation manners of the present invention will be described in detail below in combination with actual conditions.

[0060] When the present invention is implemented, the drilling fluid is composed of seawater, viscosifier, fluid loss reducer, plugging agent, inhibitor a...

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Abstract

The invention provides a clay-content-free drilling fluid, which is composed of seawater, a pH regulator, a tackifier, an antioxidant, a filtrate reducer, an inhibitor, a weighting agent and a blocking agent; the dosage of the weighting agent enables the density of the drilling fluid to be 1.20g / cm<3> and 1.50g / cm<3> respectively. The invention also discloses a preparation method of the drilling fluid. The drilling fluid provided by the invention resolves a blocking problem of a common solid-content-free system for highly-deviated wells and horizontal wells in a low-porosity and low-permeability reservoir layer and guarantees a good rheological property of the drilling fluid system at the same time.

Description

technical field [0001] The invention relates to a working fluid for petroleum drilling, and more particularly relates to a low-porosity, low-permeability reservoir, 150°C strong plugging resistance, low damage and no clay phase drilling fluid applied to ocean drilling. [0002] The present invention also relates to a preparation method of the above-mentioned drilling fluid. Background technique [0003] In the operation process of highly deviated wells (45°-85°) and horizontal wells (above 85°) encountered in ocean drilling, in order to reduce the pollution of drilling fluid to the ocean and reduce the accidents caused by solid phase deposition, often It is necessary to apply a solid-free or clay-free drilling fluid system with strong rock-carrying ability. For the clay-free phase system, it often does not have the ability to build walls. The drilling fluid system has a large fluid loss, and its filtrate seeps into the formation and often reduces the permeability of the res...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor 翟向萍王明皓
Owner PETROSTAR OIL TECH
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