A natural polymer environmentally friendly drilling solution

A natural polymer, environmentally friendly technology, applied in the field of oilfield drilling fluids, can solve the problems of difficult well control safety, high friction, torque, difficult performance maintenance, etc., to achieve good economic and social benefits, environmental protection, strong performance. Anti-collapse effect

Active Publication Date: 2017-10-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the wellbore structures are mostly three-dimensional horizontal wells and long horizontal sections. During the drilling process, the friction and torque between the drilling tool and the wellbore wall are large. Due to the early water injection, there may be high pressure in the oil layer.
For example, the shut-in pressure of a well in this block is as high as 32.7MPa (pressure coefficient is about 1.75), so it is very difficult to ensure the safety of well control, and the formation water may cause serious pollution to the drilling fluid, and the performance is difficult to maintain

Method used

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  • A natural polymer environmentally friendly drilling solution
  • A natural polymer environmentally friendly drilling solution
  • A natural polymer environmentally friendly drilling solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a natural polymer environment-friendly drilling fluid, which consists of the following components by weight percentage: 0.3%-2.0% natural anti-slump agent, 1.0%-5.0% plugging agent, 0.3%-2.0% 0.5% viscosifier, 0.5%-3.0% fluid loss reducer, 0.5%-2.5% lubricant, 0.02%-0.05% low-carbon alcohol reservoir protection agent, 0.03%-0.08% glutaraldehyde , The remainder is water.

[0022] Among them, the natural anti-slump agent is a carboxymethyl modified disaccharide, and the disaccharide is one of sucrose, lactose and maltose, or a mixture of any two or a mixture of the three; the blocking agent has a particle size ranging from 1 to 20 μm The natural modified paraffin wax, the natural modified paraffin wax is natural paraffin obtained through hydrogen peroxide or persulfuric acid oxidation modification; Lifting viscosity cutting agent is the mixture of xanthan gum and polyanionic cellulose sodium salt by volume ratio 2:1; The water-losing agent is hyd...

Embodiment 2

[0026] This embodiment provides a natural polymer environment-friendly drilling fluid, which is composed of the following components by weight percentage: 90.0% clear water, 1.5% natural anti-slump agent, 3.0% plugging agent, 0.4% viscous cutting agent, 3.0% fluid loss reducer, 2.0% lubricant, 0.05% low-carbon alcohol reservoir protection agent, 0.05% glutaraldehyde. Among them, the natural anti-slumping agent is carboxymethyl modified disaccharide, and the disaccharide is sucrose; the blocking agent is natural modified paraffin wax with a particle size range of 1-20 μm; the viscosifying agent is xanthan gum and polyanionic cellulose The sodium salt is a mixture of 2:1 by volume; the fluid loss reducer is hydroxypropyl starch; the lubricant is bio-oil refined from gutter oil or waste cooking oil; the low-carbon alcohol reservoir protection agent is ethylene glycol and propane A mixture of triols in a volume ratio of 2:1.

[0027] The following performance evaluation experimen...

Embodiment 3

[0068] This embodiment provides a natural polymer environment-friendly drilling fluid, which is composed of the following components by weight percentage: 89.59% clear water, 0.3% natural anti-slump agent, 5.0% plugging agent, 0.5% sticking and cutting agent, 2.0% fluid loss reducer, 2.5% lubricant, 0.03% low-carbon alcohol reservoir protection agent, 0.08% glutaraldehyde. Among them, the natural anti-slumping agent is carboxymethyl modified disaccharide, and the disaccharide is a mixture of sucrose and lactose; the blocking agent is natural modified paraffin wax with a particle size range of 1-20 μm; the viscosifying agent is xanthan gum and A mixture of polyanionic cellulose sodium salt at a volume ratio of 2:1; the fluid loss reducer is hydroxypropyl starch; the lubricant is bio-oil refined from gutter oil or waste cooking oil; the low-carbon alcohol reservoir protection agent is A mixture of ethylene glycol and glycerol in a volume ratio of 2:1.

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Abstract

The invention provides environment-friendly natural polymer drilling fluid. The environment-friendly natural polymer drilling fluid comprises, by weight, 0.3-2.0% of natural anti-sloughing agents, 1.0-5.0% of blocking agents, 0.3-0.5% of viscosity and shear strength enhancing agents, 0.5-3.0% of fluid loss agents, 0.5-2.5% of lubricating agents, 0.02-0.05% of low-carbon-alcohol reservoir protection agents, 0.03-0.08% of glutaraldehyde, and the balance water. The drilling fluid has very high anti-sloughing ability, inhibitive ability and plugging ability, and can rapidly form a tough and compact sealing film at the region close to the well wall so as to stabilize the well wall and prevent filter liquor and solid phases from further immersing a reservoir and effectively protect the reservoir. Besides, the drilling fluid has no biotoxicity or chemical toxicity and is biodegradable and beneficial to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling fluid, and in particular relates to a natural polymer environment-friendly drilling fluid. Background technique [0002] Longdongzhuang cluster horizontal wells are located in the central and eastern part of Changqing Oilfield. The purpose is to efficiently develop the Chang 6 and Chang 8 oil layers of the Yanchang Formation through horizontal well layout, and explore the methods suitable for increasing single well production, improving recovery, and high efficiency in Longdong Oilfield. New model developed. The wellbore structure of the horizontal well in the Longdongzhuangzihao well area is a two-split structure, and there are a series of drilling fluid technical problems that need to be solved through in-depth research during the drilling construction process. [0003] The first is the technical problem of wall instability in the long open hole. There are large sections of mud shale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/10
CPCC09K8/10C09K2208/34
Inventor 黎金明俞浩杰蔺文洁
Owner BC P INC CHINA NAT PETROLEUM CORP
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