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Micron weighted drilling fluid

A technique of aggravating drilling fluid and barite powder, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of shortening the drilling cycle and achieve improved filter cake quality, low fluid loss, and rheological property adjustment easy effect

Inactive Publication Date: 2016-01-27
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a micronized heavy drilling fluid for complex geological conditions, so as to reduce the downhole complexity and shorten the drilling cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] 1. Preparation:

[0016] Bentonite powder, Na 2 CO 3 , NaOH, PAC-LV, PMCA-2, NH 4 -HPAN, SMP-1, SPNH, FM-2 (or FT-1), KD-21D, thinner, activated barite powder and water.

[0017] Among them, the density of activated barite powder is greater than 4.20g / cm 3 The activated barite powder with a particle size greater than 75 μm accounts for 10% to 12% of the total mass of all activated barite powders, and the activated barite powder with a particle size greater than 45 μm accounts for 23% to 27% of the total mass of all activated barite powders. Activated barite powder with a particle size of less than 6 μm accounts for 24% to 30% of the total mass of all activated barite powders.

[0018] Second, on-site construction application:

[0019] 1. Construction preparation:

[0020] Before drilling into the high-pressure formation, add bentonite powder and Na 2 CO 3 , formed into a pre-hydrated bentonite slurry after mixing and stirring for 24 hours, and set aside.

[002...

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PUM

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Abstract

The invention discloses micron weighted drilling fluid, which relates to the technical field of oil field drilling, in particular to the technical field of drilling fluid preparation. In addition to water, the micron weighted drilling fluid also comprises bentonite powder, Na2CO3, NaOH, polyanionic cellulose salt, composite metal ion polymer, polyacrylonitrile ammonium salt, sulfomethal phenolaldehy resin, sulfonated lignite, sulfonated bitumen, vegetable oil lubricant, diluent and activated barite powder. The rheological property of the micron weighted drilling fluid is easy in regulation, the quality of a filter cake is improved, and the suspension stability of weighting materials becomes better. The micron weighted drilling fluid has low-plasticity viscosity, low shearing force and excellent barite suspension property. In a drilling process, the drilling fluid is adopted, and therefore, a barite cuttings bed can be prevented from forming underground, dynamic and static filter loss is small, and solid-phase separation efficiency can be improved. The micron weighted drilling fluid is one of the basic technologies necessary for supporting high pressure formation drilling construction.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling, in particular to the technical field of drilling fluid preparation. Background technique [0002] In recent years, with the increase of drilling depth, there are more and more complex geological conditions such as high temperature, high pressure, formation plastic creep, and changes in petrophysical properties under high pressure. Although various technologies supporting deep drilling operations are constantly improving, so far So far, these geological phenomena are still the main threat to drilling engineering. [0003] The existing drilling fluid consists of 5% bentonite powder, 0.2% Na 2 CO 3 , 0.3%NaOH, 0.3%PMCA-2, 0.5%NH 4 - Composition of HPAN, 2% FM-2, 1% KD-21D, 0.5% MSO and barite powder. For example, due to the impact of water injection in the old area of ​​Jiangsu Oilfield, the formation pressure is disordered, there are problems such as high risk of overflow, high densit...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/16
CPCC09K8/24C09K8/16
Inventor 王学军徐国良陈波梁鼎樊继强苟天华陈军夏迎春
Owner 中石化石油工程技术服务有限公司
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