CN1793278A

CN1793278A - Silicon fluorine anti-falldown filter agent for drilling fluid

Info

Publication number: CN1793278A
Application number: CN 200510104799
Authority: CN
Inventors: 宋福如
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-27
Filing date: 2005-12-27
Publication date: 2006-06-28
Anticipated expiration: 2025-12-27
Also published as: CN100362077C

Abstract

The invention relates to drilling fluid using silicon fluorine anti-collapse filtration reducing agent. It includes the following steps: reacting methyl tri-fluorine propyl chloride silane with deionized water; expelling the chlorine hydride; moving the resultant into distiller to do vacuum distillation; extracting distilled part at 140-160 centigrade degree methyl tri-fluorine propyl chloride silane known as DF<SUB>n</SUB>; using DF<SUB>n</SUB>, propylene brighten, acetic acid ethylene as material to react in reactor; hydrolyzing by deionized water; filter pressing; pre-processing; and pneumatic conveying drying. It is new type high efficiency drilling fluid treating compound. And it increases clay xi electric potential and solid phase dispersilbility; it has multi and fine grain, good hydrating, thick salvation film. And the formed cake of press is thin, compact, tenacity, and low permeability.

Description

Silicon fluorine anti-falldown filter agent for drilling fluid

(1), technical field

The present invention relates to the fluosilicic anti-collapse and anti-falling filtration agent that a kind of drilling fluid is used.

(2), background technology

In drilling process, but the drilling fluid leak-off enters the stratum.Drilling fluid is invaded the stratum can cause that shale hydration expands, and causes hole instability and various down hole problem when serious, bores when meeting pay sand and also can cause formation damage.The filtration property of reply drilling fluid is strictly controlled in the drilling engineering, and using suitable additive for drilling fluid is the effective ways that reduce filter loss and set up good building capacity.

(3), summary of the invention:

In order to overcome the shortcoming of prior art, the invention provides a kind of silicon fluorine anti-falldown filter agent for drilling fluid, it is a kind of novel high-efficient drilling fluid treatment agent, dispersiveness, the particle that has improved ξDian Wei, the solid phase of clay is thin and many, aquation good, the solvation thickness, the filter cake that forms is thin, fine and close, tough and tensile, rate of permeation is low, reduce the filter loss of drilling fluid, strengthen borehole wall caving-preventing ability.

The present invention solves the technical scheme that its technical problem takes: it comprises methyl trifluoro propyl chlorosilane, acrylonitrile (CN), vinyl acetate between to for plastic (VAc), wilkinite, brown coal, caustic soda and water, and the weight ratio of each component is: 100: 25～35: 40～50: 15～25: 300～330: 10～20: 35～45.

Preparation technology of the present invention is: (1) methyl trifluoro propyl chlorosilane carries out chemical reaction in proportion with water in reactor, control reaction temperature＜60 ℃, after having reacted, drive hydrogenchloride, resultant is moved into distiller, underpressure distillation, gauge pressure-0.09MPa 140～160 ℃ of fractions of intercepting down is methyl trifluoro propyl cyclosiloxane (DF _n); (2) with DF _n, acrylonitrile (CN) and vinyl acetate between to for plastic (VAc) be raw material, drops into reactor in proportion, gathers afterreaction in 50～80 ℃ under high-speed stirring; (3) add entry in the polymkeric substance that is generated, be forced into pressure in 110～130 ℃ and be no more than under the 0.5MPa and be hydrolyzed, the control section percent hydrolysis is 50～60%; (4) product of Xing Chenging after filtering, with pretreated wilkinite, brown coal and alkali lye in proportion 80～120 ℃ of reactions, resultant is prepared the SF silicon fluorine anti-falldown filter agent for drilling fluid through air stream drying, pulverizing.

The SF silicon fluorine anti-falldown filter agent for drilling fluid of present method preparation has good leak-off and the retaining wall anti sloughing effectiveness of falling.(1) effectively reduce quiet leak-off and moving leak-off, low-temp low-pressure filter loss (API) is in 10ml, and high temperature and high pre ssure filtration (HTHP) is less than 15ml; (2) improve the filter cake quality, thin, densification, toughness, oilness are good, and significant retaining wall and caving-preventing characteristic are arranged, and can avoid causing the generation of down hole problems such as bit freezing, well radius variations; (3) viscosity effect is little, has safeguarded the rheological that drilling fluid is good, is beneficial to improve mechanical efficiency and drill speed; (4) the temperature resistance ability is strong, resistance to crocking good, and use temperature reaches more than 180 ℃, is applicable to ground environment widely.

(4), embodiment

The present invention includes methyl trifluoro propyl chlorosilane, acrylonitrile (CN), vinyl acetate between to for plastic (VAc), wilkinite, brown coal, caustic soda and water, the weight ratio of each component is: 100: 30: 45: 20: 320: 15: 40.

The present invention prepares according to the following steps:

(1) raw material is prepared, and chooses the fine raw material according to described component, and carries out quality test.

(2) trial-production equipment, three mouthfuls of glass reactors of 1000～3000ml, separating funnel, 5L stainless steel reactor, homogenizer, electrically heated cover, drying machine, vacuum pump and other auxiliary facility.

(3) methyl trifluoro propyl cyclosiloxane preparation: the methyl trifluoro propyl chlorosilane carries out chemical reaction in proportion with water in reactor, control reaction temperature＜60 ℃, after having reacted, drive hydrogenchloride, resultant is moved into distiller, underpressure distillation, gauge pressure-0.09MPa 140～160 ℃ of fractions of intercepting down is methyl trifluoro propyl cyclosiloxane (DF _n).

(4) synthetic polymer: with DF _n, acrylonitrile (CN) and vinyl acetate between to for plastic (VAc) be raw material, drops into reactor in proportion, under high-speed stirring, gather afterreaction and generate polymkeric substance in 50～80 ℃.

(5) polymkeric substance hydrolysis: add entry in the polymkeric substance that is generated, be forced into pressure in 110～130 ℃ and be no more than under the 0.5MPa and be hydrolyzed, the control section percent hydrolysis is 50～60%.

(6) the finished product: the product that hydrolysis obtains after filtering, with pretreated wilkinite, brown coal and alkali lye in proportion 80～120 ℃ of reactions, resultant is prepared the SF silicon fluorine anti-falldown filter agent for drilling fluid through air stream drying, pulverizing.

SF silicon fluorine anti-falldown filter agent for drilling fluid product application example:

Get 700 parts of distilled water, 3 parts of sodium bicarbonates, 25 parts of wilkinites, estimate soil and in container, mix for 20 parts, high-speed stirring 30 minutes, normal temperature lower seal maintenance 24 hours, recording its filter loss is that 23～26ml, apparent viscosity are 7～8mPa, starches as reference test with this.

Get said reference test slurry 350ml, add SF silicon fluorine anti-falldown filter agent for drilling fluid 3.5g (accounting for 1%), stirred 30 minutes in high speed agitator, recording its filter loss after being uniformly dispersed is that 9～10ml, apparent viscosity are 7～8mPa.Through 180 ℃, 24 hours thermal ageings, recording its filter loss on the high pressure high temperature filter tester device only was 14～15ml again.

Claims

1, a kind of silicon fluorine anti-falldown filter agent for drilling fluid, it is characterized in that: it comprises methyl trifluoro propyl chlorosilane, acrylonitrile, vinyl acetate between to for plastic, wilkinite, brown coal, caustic soda and water, and the weight ratio of each component is: 100: 25～35: 40～50: 15～25: 300～330: 10～20: 35～45;

Preparation technology is: (1) methyl trifluoro propyl chlorosilane carries out chemical reaction in proportion with water in reactor, control reaction temperature＜60 ℃, after having reacted, drive hydrogenchloride, resultant is moved into distiller, underpressure distillation, gauge pressure-0.09MPa 140～160 ℃ of fractions of intercepting down is DFn for the methyl trifluoro propyl cyclosiloxane; (2) be raw material with DFn, acrylonitrile and vinyl acetate between to for plastic, drop into reactor in proportion, under high-speed stirring, gather afterreaction in 50～80 ℃; (3) add entry in the polymkeric substance that is generated, be forced into pressure in 110～130 ℃ and be no more than under the 0.5MPa and be hydrolyzed, the control section percent hydrolysis is 50～60%; (4) product of Xing Chenging after filtering, with pretreated wilkinite, brown coal and alkali lye in proportion 80～120 ℃ of reactions, resultant is prepared the SF silicon fluorine anti-falldown filter agent for drilling fluid through air stream drying, pulverizing.