Drilling fluid and preparation method thereof

A technology of drilling fluid and coating agent, applied in the field of oil and gas field drilling, can solve the problem that it is suitable for one kind of formation, such as sandstone formation, mud shale formation or salt gypsum formation, the drilling fluid performance is single, does not have broad-spectrum type, etc. question

Active Publication Date: 2011-01-05
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
View PDF3 Cites 55 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Applicable to a single formation
One type of drilling fluid is only suitable for one type of formation, such as sandstone formation, mud shale formation or salt gypsum formation, etc., and does not have a broad spectrum, that is, it is not suitable for various lithological formations;
[0007] (2) Single anti-collapse performance
It only has the anti-collapse effect on the easily dispersed or only on the easily collapsed strata, and does not have the simultaneous anti-collapse effect on the easily dispersed and easily collapsed strata;
[0008] (3) single function
[0009] In summary, the existing drilling fluids have single performance and cannot effectively prevent wellbore instability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Drilling fluid and preparation method thereof
  • Drilling fluid and preparation method thereof
  • Drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1.1) Preparation of base slurry: In N milliliters of water, add 0.003 N grams of anhydrous sodium carbonate Na 2 CO 3 and 0.04N grams of bentonite for drilling fluid, continue to stir for more than 16 hours, and then let stand for 24 hours;

[0046] (1.2) In the base slurry, add various treatment agents in the following dosages while stirring:

[0047] Coating agent: 0.003N grams of natural polymer coating agent IND30;

[0048] Viscosifier: 0.015N grams of biopolymer graft modification GEL30;

[0049] Fluid loss additive: 0.01N grams of medium viscosity carboxymethylcellulose CMC-MV;

[0050] Anti-slump agent: 0.015N grams of polyalcohol PE-1:

[0051] Lubricant: 0.02N grams of non-toxic lubricant FXRH;

[0052] Dispersant: 0.01N grams of sodium dodecylbenzenesulfonate ABS:

[0053] The rigid bridging agent is 0.05N grams of rice bran:

[0054] The rigid filler is 0.08 N grams of oil soluble resin.

[0055]In the present embodiment one, if N gets 100, then spec...

Embodiment 2

[0057] (2.1) Preparation of base slurry: in N milliliters of water, add 0.003 N gram of anhydrous sodium carbonate Na CO 3 and 0.04 gram of bentonite for drilling fluid while stirring, continue stirring for more than 16 hours, and then let stand for 24 hours;

[0058] (2.2) In the base slurry, add various treatment agents in the following dosages while stirring:

[0059] Coating agent: 0.0045 N grams of high-viscosity polyanionic cellulose PAC-HV;

[0060] Viscosifier: 0.018N grams of high-viscosity carboxymethylcellulose CMC-HV:

[0061] Filtrate reducer: 0.015N grams of carboxymethyl starch CMS;

[0062] Anti-slump agent: 0.015N grams of polyalcohol JLX and 0.008N grams of cationic emulsified bitumen PC-1:

[0063] Lubricant: 0.025N grams of ink RH-3:

[0064] Dispersant: 0.013N grams of octylphenol polyoxyethylene ether OP-10;

[0065] Rigid bridging agent: 0.065 N grams of cottonseed hulls;

[0066] Rigid filler: 0.115 N grams of walnut shells.

[0067] In the presen...

Embodiment 3

[0069] (3.1) Preparation of base slurry: in N milliliters of water, add 0.002N-0.005N grams of anhydrous sodium carbonate Na2CO3 and 0.04 grams of bentonite for drilling fluid while stirring, continue stirring for more than 16 hours, and then let stand for 24 hours;

[0070] (3.2) In the base slurry, add various treatment agents in the following dosages while stirring:

[0071] Coating agent: 0.006N grams of acrylamide multi-polymer Coater-10;

[0072] Viscosifier: 0.02 N grams of high-viscosity carboxymethylcellulose CMC-HV;

[0073] Fluid loss control agent: 0.02 N grams of sulfomethyl phenolic resin SMP;

[0074] Anti-slump agent: 0.01N grams of sulfonated asphalt FT-1 and 0.02N grams of non-fluorescent white asphalt NFA-25;

[0075] Lubricant: 0.03N grams of vegetable oil modified lubricant CX-3;

[0076] Dispersant: 0.015N grams of sorbitan ester SP80;

[0077] Rigid bridging agent: 0.04N grams of sawdust and 0.04N grams of corn cob;

[0078] Rigid fillers: 0.1 N gra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a drilling fluid and a preparation method thereof. The drilling fluid comprises Nml of water, wherein N is a positive number, 0.002N-0.005N gram of anhydrous sodium carbonate Na2CO3, 0.04N gram of bentonite for the drilling fluid, 0.003N-0.006N gram of coating agent, 0.015N-0.02N gram of tackifier, 0.01N-0.02N gram of filtrate reducer, 0.015N-0.03N gram of anti-collapse agent, 0.02N-0.03N gram of lubricant, 0.01N-0.015N gram of dispersing agent, 0.05N-0.08N gram of rigid bridging agent and 0.08N-0.15N gram of rigid filler. The drilling fluid of the invention is applicable to a loss formation and has obvious leakage stoppage effect, a leak-proof function at the same time and obvious inhibiting effect on a formation which is easy to disperse and collapse.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling in the petroleum industry, in particular to a drilling fluid and a preparation method thereof. Background technique [0002] Borehole wall instability is a major problem that is common in the oil drilling process and has been plaguing the oil industry. Well wall instability includes: well wall collapse, lost circulation, etc. According to a conservative estimate, wellbore instability will cause losses of US$500-600 million to the world oil industry every year. [0003] Since the drilling project is an underground project involving complex and ever-changing geological structures, the wellbore instability caused during the construction will also induce other downhole accidents. The important content of unremitting efforts to tackle key problems. [0004] For a long time, Chinese petroleum workers have often encountered the problem of wellbore instability during drilling. Espec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/20C09K8/14
Inventor 王德桂任文军毛志新马鹏飞毕延森冯建秋
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap