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Weak gel system for drilling fluid

A drilling fluid and weak gel technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of static suspended sand and dynamic sand carrying in high-deviated and horizontal sections, and the development of drilling fluid systems. Large obstacles, poor wellbore cleaning ability, etc., to achieve the effects of good gel breaking, high dynamic-to-plastic ratio and low apparent viscosity

Inactive Publication Date: 2015-06-03
BEIJING SHIDABOCHENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]In horizontal well drilling, poor wellbore stability, annular suspended sand carrying and poor wellbore cleaning ability, traditional water-based and oil-based drilling fluids will The reservoir caused great damage, and the problem of static suspended sand and dynamic sand carrying in the high-inclination section and the horizontal section could not be solved. During the drilling of horizontal wells, it is easy to form a cuttings bed at the bottom of the wellbore; the formed mud cake is adsorbed on the It is not easy to remove on the well wall, and the effect of gel breaking and plugging removal is poor, which increases the damage to the reservoir
In order to solve this problem, existing technicians have solved this problem by developing a weak gel drilling fluid system, but the raw materials used in this technology on the market are various and the quality is also uneven, which has great impact on the development of drilling fluid system. Great hindrance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A weak gel system for drilling fluid, the components of which are 100% water, 0.2% sodium hydroxide, 0.12% sodium carbonate, 0.2% polyacrylamide potassium salt, 0.5% hydrolyzed polyacrylonitrile sodium salt , 0.2% low-viscosity sodium carboxymethyl cellulose, 2.5% sulfonated pitch, 2% sulfonated lignite, 1% sulfonated tannin, 0.15% conventional zwitterionic viscosity reducer, 0.5% conventional weak gelling agent and 2% conventional plugging lubricant, all the above components are special components for drilling fluid.

Embodiment 2

[0018] Example 2: A weak gel system for drilling fluid, the components of which are 100% clean water, 0.1% sodium hydroxide, 0.09% sodium carbonate, 0.1% synergistic anti-collapse agent, 0.2% hydrolyzed polyacrylonitrile ammonium salt , 0.1% medium viscosity sodium carboxymethyl cellulose, 2% low fluorescent asphalt, 1% anti-high temperature viscosity reducer, 0.5% sulfonated tannin, 0.1% conventional zwitterionic viscosity reducer, 0.2% conventional weak gel And 1% conventional plugging lubricant. The above components are all special components for drilling fluid.

Embodiment 3

[0019] Example 3: A weak gel system for drilling fluid, the components of which are 100% clean water, 0.3% sodium hydroxide, 0.15% sodium carbonate, 0.3% drilling fluid coating agent, 0.7% sodium hydrolyzed polyacrylonitrile Salt, 0.3% high-viscosity sodium carboxymethyl cellulose, 3% blocking agent blocking anti-collapse agent, 3% viscosity reducing agent sulfonated lignite, 2% dispersing agent sulfonated tannin, 0.3% conventional zwitterionic reducing agent Viscosity, 0.5% conventional weak gelling agent and 3% conventional plugging lubricant. The above components are all special components for drilling fluids.

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PUM

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Abstract

The invention provides a weak gel system for a drilling fluid. The weak gel system is characterized by comprising the following components in different proportions: clear water, sodium hydroxide, sodium carbonate, an inhibitor, a filtrate reducer, a tackifier, a blocking agent, a viscosity reducer, a dispersant, a zwitter-ion viscosity reducer, a weak gel and a blocking lubricant. The weak gel system for the drilling fluid is a special drilling fluid system provided for horizontal well section drilling operation and obtained by optimization and modification on the basis of the existing horizontal well section drilling operation system. The weak gel system for the drilling fluid has unique rheological property, and is capable of effectively controlling the invasion depth of a solid-liquid relative reservoir stratum and reducing the damage to the reservoir stratum to the utmost extent; and as a result, the problems of static sand suspension and dynamic sand carrying of the drilling fluid in the horizontal well section drilling process can be solved.

Description

[0001] technical field [0002] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a weak gel system for drilling fluid. Background technique [0003] In horizontal well drilling, the stability of the wellbore is poor, the ability to carry sand in the annulus is poor, and the wellbore cleaning ability is poor. The problem of static suspended sand and dynamic sand carrying in the horizontal section is easy to form a cuttings bed at the bottom of the wellbore during horizontal well drilling; the formed mud cake is adsorbed on the well wall and is not easy to remove, and the effect of gel breaking and plugging removal is poor, which increases the damage to the reservoir. In order to solve this problem, existing technicians have solved this problem by developing a weak gel drilling fluid system, but the raw materials used in this technology on the market are various and the quality is also uneven, which has great impact on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 朱夫立鄢捷年王义虎马平平杨荣奎张荣志杨万成田军李云亭
Owner BEIJING SHIDABOCHENG TECH
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