KCl blocking and anti-sloughing drilling fluid and preparation method thereof

A technology of drilling fluid and coating inhibitor, which is applied in the field of petroleum drilling, can solve the problems of poor plugging ability and insufficient ability to inhibit water-sensitive collapse, and achieve good anti-collapse and meet the needs of safe construction

Inactive Publication Date: 2015-01-14
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the conventional drilling fluids currently used, polysulfonate drilling fluid and organosilanol drilling fluid have insufficient ability to i

Method used

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  • KCl blocking and anti-sloughing drilling fluid and preparation method thereof
  • KCl blocking and anti-sloughing drilling fluid and preparation method thereof
  • KCl blocking and anti-sloughing drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare the drilling fluid according to the components of the following mass fractions, each component is added into the water by a shear pump, and the middle is supplemented with 75rpm stirring: add 0.1% Na 2 CO 3 , stirred for 6 minutes; added 3.2% bentonite, stirred for 30 hours; added 0.2% NaOH, stirred for 10 minutes; added 4% modified asphalt, 2.5% anti-salt fluid loss additive, 3% anti-high temperature fluid loss additive, 1.5% compound ammonium salt, stir for 15 minutes; add 0.3% polymer inhibitor, stir for 15 minutes; add 0.5% polyamine inhibitor, stir for 15 minutes; add 1% mud cake quality improver, stir for 15 minutes; add 8% KCL, stirred for 15 minutes; added 0.2% flow regulator, stirred for 15 minutes; added 3% anti-slump lubricant, 2% extreme pressure liquid lubricant, stirred for 10 minutes; added 2.5% high-efficiency anti-slump agent, stirred for 10 minutes ; Add 0.3% film-forming wall-solidifying agent and stir for 10 minutes to obtain drilling fluid....

Embodiment 2

[0039] Add the following mass fraction components into water with a shear pump under stirring at 70rpm: add 0.1% Na 2 CO 3 , stirred for 8 minutes; added 3.2% bentonite, stirred for 25 hours; added 0.2% NaOH, stirred for 10 minutes; added 4% modified asphalt, 2.5% anti-salt fluid loss additive, 3% anti-high temperature fluid loss additive, 1.5% compound ammonium salt, stir for 15 minutes; add 0.3% polymer inhibitor, stir for 15 minutes; add 0.5% polyamine inhibitor, stir for 15 minutes; add 0.8% mud cake quality improver, stir for 12 minutes; add 8% KCL, stirred for 15 minutes; added 0.2% flow regulator, stirred for 15 minutes; added 3% anti-slump lubricant, 2% extreme pressure liquid lubricant, stirred for 15 minutes; added 2.5% high-efficiency anti-slump agent, stirred for 10 minutes ; Add 0.3% film-forming wall-solidifying agent and stir for 10 minutes to obtain drilling fluid.

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PUM

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Abstract

The invention discloses a drilling fluid prepared from the following components in percentage by mass: 3.2-3.5% of bentonite, 0.1-0.2% of Na2CO3, 0.3-0.5% of polymer encapsulating/inhibiting agent, 0.5% of polyamine inhibitor, 1.0-1.5% of compound ammonium salt, 3.0-3.5% of high-temperature-resistant filtrate loss reducer, 2.5-3.0% of salt-resistant filtrate loss reducer, 0.8-1.2% of mud cake quality improver, 4.0-5.0% of modified asphalt, 2.5-3.0% of efficient anti-sloughing agent, 3.0-3.5% of anti-sloughing lubricant, 0.3% of film forming and wall fixing agent, 2.0-2.5% of extreme pressure fluid lubricant, 0.2-0.3% of flow pattern regulator, 8.0-10.0% of KCl, 0.2-0.3% of NaOH and the balance of water. The invention also provides a preparation method of the drilling fluid. The drilling fluid has favorable anti-sloughing, lubricating, anti-blocking and wellbore cleaning abilities.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a drilling fluid and a preparation method thereof. Background technique [0002] The geological conditions of some oil and gas fields in my country are relatively complex, which is very unfavorable to drilling operations. The construction of horizontal wells in some areas has long faced the problems of mudstone collapse and pipe sticking in deep formations and horizontal sections, and construction safety is difficult to guarantee. Taking the formation lithology characteristics of the Sulige gas field in my country as an example, there are three types of well collapse modes in the deep formation mudstone of this area: water sensitivity, hard brittleness and fragmentation. The collapse amount is large, difficult to control, and the periodic collapse phenomenon is obvious; The carbonaceous mudstone near the gas zone has strong water sensitivity and poor stability. When drilling a la...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/24C09K8/514C09K2208/02C09K2208/34
Inventor 邓增库杨文权蒋明王先洲郑丽君袁鸥罗树祥夏景刚窦建宇唐金祥
Owner CNPC BOHAI DRILLING ENG
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