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Polymer Clean Drilling Fluid System

A polymer and amine polymer technology, applied in the field of petroleum drilling aids, can solve problems such as wellbore instability, and achieve the effects of wellbore cleanliness, good comprehensive performance, and good fluid loss reduction performance.

Active Publication Date: 2022-04-22
石家庄华莱鼎盛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a polymer cleaning drilling fluid system, which has good fluid loss control performance, suppression performance and lubrication performance, good comprehensive performance, and is beneficial to wellbore cleaning, reservoir cleaning and environmental protection. It can solve the wellbore instability problem easily caused by water-based drilling fluid in the drilling process, and is suitable for drilling in the inclined section or horizontal section of the sand-shale mixed layer formation

Method used

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Embodiment 1

[0023] Embodiment 1: polymer cleaning drilling fluid system (i.e. cleaning type polymer drilling fluid system) of the present invention is made by the raw material of following mass ratio: 1000 parts of tap water, 40 parts of bentonite, 2 parts of sodium carbonate , 0.6 parts of sodium hydroxide, 12 parts of fluid loss reducer, 17 parts of wall-fixing agent, 5 parts of coating agent, 6 parts of polyanionic cellulose, 9 parts of high temperature and salt-resistant fluid loss reducer, 12 parts of lubrication inhibitor, drilling 22 parts of solid lubricant for liquid, 6 parts of solid lubricant graphite, 43 parts of KCl, 2 parts of gel plugging agent, 12 parts of superfine calcium carbonate powder, weighting agent barite powder, the amount of weighting agent should meet the adjusted mud density up to 1.20g / cm 3 requirements.

[0024] The main component of the fluid loss control agent is cucurbituril[n]-amine salt polymer microspheres, n=5, cucurbituril[n] is cucurbituril[5], and...

Embodiment 2

[0032] Embodiment 2: The polymer cleaning drilling fluid system of the present invention is made of the raw materials of the following mass ratio: 1000 parts of tap water, 35 parts of bentonite, 2.5 parts of sodium carbonate, 0.8 part of sodium hydroxide, fluid loss reducer 15 parts of agent, 18 parts of wall-fixing agent, 4 parts of coating agent, 7 parts of polyanionic cellulose, 10 parts of high temperature anti-salt fluid loss reducer, 15 parts of lubrication inhibitor, 25 parts of solid lubricant for drilling fluid, solid lubricant 9 parts graphite, 48 parts KCl, 2.5 parts gel plugging agent, 14 parts superfine calcium carbonate powder, weighting agent barite powder, the amount of weighting agent should meet the mud density after adjustment to 1.30g / cm 3 requirements.

[0033] The main component of the fluid loss control agent is cucurbituril[n]-amine salt polymer microspheres, n=6, cucurbituril[n] is cucurbituril[6], and the amine salt is 1,5-diaminopentane Dihydrochlor...

Embodiment 3

[0035] Embodiment 3: The polymer cleaning drilling fluid system of the present invention is made of the raw materials of the following mass ratio: 1000 parts of tap water, 40 parts of bentonite, 2.8 parts of sodium carbonate, 1 part of sodium hydroxide, fluid loss reducer 15 parts of agent, 19 parts of wall-fixing agent, 5 parts of coating agent, 8 parts of polyanionic cellulose, 10 parts of high temperature anti-salt fluid loss reducer, 14 parts of lubrication inhibitor, 24 parts of solid lubricant for drilling fluid, solid lubricant 10 parts of graphite, 49 parts of KCl, 3 parts of gel plugging agent, 15 parts of superfine calcium carbonate powder, weighting agent barite powder, the amount of weighting agent should meet the mud density after adjustment to 1.40g / cm 3 requirements.

[0036] The main component of the fluid loss control agent is cucurbituril[n]-amine salt polymer microspheres, n=7, cucurbituril[n] is cucurbituril[7], and amine salt is 1,1-dimethyl- 4,4'-bipyrid...

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Abstract

A polymer cleaning drilling fluid system, which is made of the following raw materials: tap water, bentonite, sodium carbonate, sodium hydroxide, fluid loss reducer, wall solidifying agent, coating agent, polyanionic cellulose, high temperature resistant Salt fluid loss reducer, lubrication inhibitor, solid lubricant for drilling fluid, solid lubricant graphite, KCl, gel plugging agent, ultrafine calcium carbonate powder, weighting agent barite powder. The preparation method of the fluid loss reducer and the wall-fixing agent is also provided. FL after aging at 180°C in the present invention HTHP ≤13mL, 8h linear expansion reduction rate ≥80%, cuttings rolling recovery rate ≥92%, mud cake adhesion coefficient ≤0.1, it has good fluid loss control performance, inhibition performance and lubricating performance, suitable for sand-shale mixed layer Drilling of deviated or horizontal sections of formations. The invention has good comprehensive performance, low cost, environmental protection, effectively solves the problem of well wall instability easily caused by water-based drilling fluid in the drilling process, and is beneficial to wellbore cleaning, reservoir cleaning and environmental protection.

Description

technical field [0001] The invention relates to a petroleum drilling aid, in particular to a polymer cleaning drilling fluid system. The invention also relates to a preparation method of the polymer cleaning drilling fluid system. Background technique [0002] The comprehensive performance of existing drilling fluid systems is average, some have poor fluid loss control performance, some have poor suppression performance, and some have poor lubrication performance, which has not completely solved the problem of wellbore instability easily caused by water-based drilling fluid during drilling , which brings difficulties to wellbore cleaning and reservoir cleaning, which is not conducive to environmental protection. [0003] Related patent documents: CN111574973A discloses a three-water-based drilling fluid system, raw materials: 1000 parts of tap water, 40-50 parts of bentonite, 2-3 parts of sodium carbonate, 0.5-1 part of sodium hydroxide, coating agent HLBE-2 3 ~5 parts, fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/52C08B37/08
CPCC09K8/24C09K8/52C08B37/003C09K2208/08C09K2208/12C09K2208/34
Inventor 宋卫国
Owner 石家庄华莱鼎盛科技有限公司
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