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Strong-inhibition bipotassium amine-based ionic polymeric drilling fluid and preparation method thereof

An ionic polymer, double potassium amine-based technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of inconvenient drilling fluid construction and maintenance treatment, inconvenient wellbore stabilization effect, and wellbore stabilization effect. It can achieve the effect of obvious wellbore stabilization, good inhibition of clay hydration and dispersion ability, and improvement of system inhibition.

Active Publication Date: 2019-07-19
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned invention has the following defects: (1) The composition of the formula is relatively complicated, which is inconvenient for the construction and maintenance of drilling fluid during rapid drilling; Wall stabilizers, shale inhibitors and plugging agents stabilize the wellbore, but for some new exploration areas, such as areas that require low-density drilling fluid to drill quickly and ensure wellbore stability cannot be effectively used
(3) Improving the formation pressure bearing capacity and increasing the drilling fluid density in some drilling areas has no obvious effect on stabilizing the borehole wall, and the above invention is not suitable for such areas
After increasing the pressure bearing capacity of the formation, the effect on the stability of the wellbore wall is not obvious, and after increasing the drilling fluid density, the drilling speed is significantly reduced

Method used

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  • Strong-inhibition bipotassium amine-based ionic polymeric drilling fluid and preparation method thereof
  • Strong-inhibition bipotassium amine-based ionic polymeric drilling fluid and preparation method thereof
  • Strong-inhibition bipotassium amine-based ionic polymeric drilling fluid and preparation method thereof

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Embodiment 1

[0029] The Cretaceous and above formations on the right bank of the Amu Darya River in Turkmenistan are long sections of mud shale, with a clay content of about 40%, of which the clay content of illite and illite-smectite layers is 51.9% to 89.1%, with an average content of 72.1%. The fundamental reason for the stability is that from the Xielongian to the Fanlanyin formations, micro-fractures are developed, the width of the fractures is 1.25-18.56um, and the pores are unevenly developed; when the micro-fractured shale formations are drilled, the hydration expansion of the well wall collapses easily. The present invention strongly inhibits the dipotassium amine-based ion polymer drilling fluid for drilling mud shale formations of the Cretaceous and above in the Amu Darya River in Turkmenistan. Or complex downhole problems such as excessive torque during drilling and borehole wall collapse. The synergistic effect of multiple inhibitors has been used to solve the hydration expansi...

Embodiment 2

[0054] As another preferred embodiment of the present invention, this embodiment discloses:

[0055] A kind of strongly inhibited dipotassium amine-based ionic polymer drilling fluid is characterized in that: by mass volume percentage, it comprises the following components:

[0056] Bentonite 3%; caustic soda 0.5%; soda ash 0.3%; polyacrylamide potassium salt KPAM 0.5%; potassium chloride 10%; zwitterionic polymer coating agent FA367 0.2%; shale inhibitor amide polymer JXA-1 0.5%; Fluid loss reducer 0.5%; Viscosifier 0.2%; Viscosity reducer 0.3%; Weighting agent: fine calcium carbonate or barite, the balance is water; The weighting agent increases the density range of 1.10g / cm 3 -2.40g / cm 3 . Preferably, the fluid loss control agent is one or a combination of low viscosity polyanionic cellulose and low viscosity carboxymethyl cellulose. Preferably, the thickener is one or a combination of any two of xanthan gum, high-viscosity polyanionic cellulose, and light subgel. Prefe...

Embodiment 3

[0059] As another preferred embodiment of the present application, this embodiment discloses:

[0060] A kind of strongly inhibited dipotassium amine-based ionic polymer drilling fluid is characterized in that: by mass volume percentage, it comprises the following components:

[0061] Bentonite 5%; caustic soda 0.3%; soda ash 0.25%; polyacrylamide potassium salt KPAM 0.3%; potassium chloride 8%; zwitterionic polymer coating agent FA367 0.8%; shale inhibitor amide polymer JXA-1 0.5%; Fluid loss reducer 0.7%; Viscosifier 0.3%; Viscosity reducer 0.2%; Weighting agent: fine calcium carbonate or barite, the balance is water; The weighting agent increases the density range of 1.10g / cm 3 -2.40g / cm 3 . Preferably, the fluid loss control agent is one or a combination of low viscosity polyanionic cellulose and low viscosity carboxymethyl cellulose. Preferably, the thickener is one or a combination of any two of xanthan gum, high-viscosity polyanionic cellulose, and light subgel. Pre...

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Abstract

The invention relates to a strong-inhibition bipotassium ionic polymeric drilling fluid. The strong-inhibition bipotassium amine-based ionic polymeric drilling fluid comprises the following componentsin percent by mass: 2-5% of bentonite, 0.2-0.5% of caustic soda, 0.2-0.3% of soda ash, 0.2-0.5% of potassium polyacrylamide, 5-10% of potassium chloride, 0.2-1% of a zwitterionic polymeric coating agent, 0.5-2% of a shale inhibitor amide polymer, 0.5-1% of a fluid loss additive, 0.2-0.5% of a tackifier, 0.1-0.3% of a viscosity reducer and the balance of water, wherein the weighting density rangeof a weighting agent is 1.10-2.40g / cm<3>. The strong-inhibition bipotassium amine-based ionic polymeric drilling fluid has a very strong function of inhibiting the water-absorbing swelling and dispersion of a clay mineral, has a very good rheological property and proper fluid loss, and can significantly increase the drilling speed of mud shale and stabilize the borehole wall of the mud shale so asto reduce occurrence of downhole accidents.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a strongly inhibited dipotassium amine-based ion polymer drilling fluid and a preparation method thereof. Background technique [0002] With the gradual development of oil and gas development and exploration to complex areas, the natural environment encountered in the exploration process is getting worse and worse, and the drilling stacks are becoming more and more complicated, and the stability of the wellbore of shale is a problem that plagues the drilling industry as well. It will cause complex downhole accidents such as well wall collapse, borehole shrinkage, formation fracturing, bit balling, stuck pipe, etc., which will seriously affect the drilling speed and cause a series of problems for cementing, well logging evaluation and later construction. As a result, some new exploration areas will not be able to drill to the target layer, which will...

Claims

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Application Information

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IPC IPC(8): C09K8/14C09K8/24
CPCC09K8/14C09K8/16C09K8/24C09K2208/12
Inventor 邓仕奎吉永忠高利华王建章李华坤王棋杨刚向朝纲陈华吴泓璇赵渝何虹
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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