CN1621656A

CN1621656A - Method for configuring and maintaining long section barefoot drilling fluid

Info

Publication number: CN1621656A
Application number: CNA2003101110176A
Authority: CN
Inventors: 邓仕奎; 陈俊斌; 吴先忠; 吴忠国; 陈平; 李华坤; 熊明勇; 杨国懿; 古天星; 禹松
Original assignee: Sichuan Petroleum Administration Bureau
Current assignee: Sichuan Petroleum Administration Bureau
Priority date: 2003-11-26
Filing date: 2003-11-26
Publication date: 2005-06-01

Abstract

The present invention is the compounding and maintaining method of well drilling fluid for long open hole drilling in exploiting petroleum and natural gas. The present invention provides long open hole drilling fluid including mud inhibiting polynary polymer system for upper open hole, polynary sulfonate polymer system for lower open hole and oil mixture-sulfonate polymer system for horizontal section, and the long open hole drilling fluid may be used in open hole drilling up to 5000 m. The drilling fluid for the upper section use has proper higher soil content and two kinds of polymer and is favorable to carrying sand, suspending, preventing leakage and preventing collapse; and that for the lower section use has sufficient high molecular weight polymer as coating agent and detergent and no dispersant for fast drilling, dispersing, pulping, preventing jamming, preventing balling and utilizing hydraulic horsepower.

Description

The configuration and the maintaining method of long section bore hole drilling fluid

Technical field: a kind of configuration and maintaining method of the section of length bore hole drilling fluid, the long section bore hole that is used for petroleum gas is crept into, and belongs to the formula technique field of drilling fluid system.

Background technology: in the prior art, the oil or the natural gas well that the dark 5000m that bung down are above, for the borehole wall is collapsed, generally all in drilling process, be lowered to three layers of casing cementing, in order to save drilling cost, the research work of carrying out long bore hole section is also arranged, but present bore hole section is between 4000～4500 meters, have only 500 meters bore hole section, can reach the above bore hole drilling well of 5000m does not have precedent as yet, does not see the research of this respect according to data abroad yet, utilize sleeve pipe fixedly the technology of the borehole wall used for many years, it has the advantage that the borehole wall is collapsed, and its shortcoming is: be not suitable for the oil drilling low cost development strategy of current enforcement, simultaneously, because intermediate demand setting of casing, need stop to bore, the speed that this creeps into influence has bigger influence to the competitiveness in market.

Summary of the invention: the present invention will design a kind of top well to adopt multipolymer inhibition system, bottom to adopt polynary poly-sulphur system, adopt poly-sulphur oil emulsion drilling fluid at directed net horizontal section, can be used for reaching the configuration and the maintaining method of the long section bore hole drilling fluid that the 5000m bore hole creeps into.

The present invention is achieved in that in top layer well section and bores being mainly drifting sand layer and becoming the relatively poor argillic horizon of lithology of meeting, the main problem of considering anti-collapse, antiseep, taking sand and suspension, therefore to guarantee the strong wave making machine and the suitable high shearing force of drilling fluid, in this well section, suitably height is a bit for native content in the mud, two kinds of polymer composite uses simultaneously, configuration base slurry and aquation+other polymer are made into glue, adjust processing, carry out performance maintenance with large and small Molecularly Imprinted Polymer composite glue and base slurry in the drilling process; Open and three spud sections two, this well Duan Weichang barefoot interval, main contradiction is to suppress and rheological characteristic, adopt low solid phase to wrap by force by the polynary sulphonated polymer mud system of dispersed polymeres not, on drilling fluid is safeguarded, at first fill up the heavy polymer coating agent and be used in combination cleaning agent, do not use dispersing agent, run into exceptional well Duan Shike and use polymeric alcohol.

Advantage of the present invention is: the native content that top layer well section is suitably high and two kinds of polymer composite uses simultaneously help taking sand, suspension, antiseep and anti-collapse, open to use when opening two and fill up the high molecular weight polymers coating agent and be used in combination cleaning agent with three, can play fast creep into, the effect of dispersion, pulping, anti-blocked portion, anti-mud drum and performance water horse power, do not use dispersing agent can solve the problem of blocked portion, anti-mud drum and reaming.

The specific embodiment: following is that example provides most preferred embodiment of the present invention with the HD1-22H well: 5600 meters of this well finishing drilling well depths, bore hole segment length reaches 5080 meters, 661.59 meters of horizontal movements, well section 0～500 meter well depth in top layer, top adopts multipolymer to suppress mud system, and drilling fluid The field prescription is as follows: the first step is configuration swell soil magma 120～150m earlier ³, prescription is: fresh water+0.2～0.3%NaOH+0.3～0.6%Na ₂CO ₃+ 5～8% swell soil carries out in proper order by prescription during dosing, after fully stirring, and hydration time 〉=16 hour; Second step was disposed glue again, prescription is: the well site water+little molecule 0.5～0.8% of caustic soda 0.1%+ polymer macromolecule 0.5～0.8%+ polymer, then the swell soil magma for preparing is mixed with glue and be made into top layer, top drilling fluid, the maintenance program of top layer, top drilling fluid is: check the salinity of measuring well site water earlier, when salinity is high, improve the dosage of soda ash and caustic soda, in drilling process, add a spot of glue and additional prehydration swell soil magma slowly, adopt the level Four well control, be lowered to the preceding well of thoroughly cleaning of surface pipe; The lower well section adopts polynary poly-sulphur system formulation from 500～5100 meters well sections, and filling a prescription is: base slurry+KPAM0.1～0.2%+SMP _-12～3%+SPNH (PSC _-1) 2～3%+ sulfonated gilsonite or mulseal 2～5%+ sliding agent 0.5～2%+ agstone or blanc fixe be made into the drilling fluid of lower well section; The maintaining method of lower well section drilling fluid is: clean earlier thoroughly mud settling tank before spudding in, before boring the boiling water bod, prevent that with soda ash preliminary treatment drilling fluid cement from invading, have stronger encapsulating ability for making drilling fluid, alleviate blocked portion, macromolecule polyalcohol is pressed 2～3kg/m ³Sized molecules dosage ratio is (2～3): 1, for guaranteeing the lubricity of drilling fluid, the sliding agent dosage is 1.0～1.5%, add 0.5～1% Pluronic polyols SYP-1 and an amount of cleaning agent RH-4 simultaneously, for preventing seepage, in drilling fluid, add 1～3% YL-80 and drill-feeding plugging agent, the each addition of drill-feeding plugging agent is controlled at 0.5%; Net horizontal section is from 4815.79～5128.27 meters, the drilling fluid mud maintaining method of this well section is: thoroughly clean mud settling tank at horizontal well drilling Duan Qianxian, use soda ash preliminary treatment drilling fluid before the drilling out, invade to prevent water mud, the drilling fluid of this well section is based on the polynary poly-sulphur system of top well section, the dosage of CMP-3 is controlled at 0.1～0.2%, and the polymer macromolecule dosage is 2～3kg/m ³Sized molecules dosage ratio is (2～3): 1, to guarantee that drilling fluid has stronger encapsulating ability, prevent blocked portion, sliding agent dosage 0.5～1%, crude oil dosage are 3～5%, and the SP-80 dosage is 0.5～1.5%, and an amount of RH-4 cleaning agent and Pluronic polyols SYP-1, for preventing seepage, in drilling fluid, add an amount of YL-80 and 1～3% drill-feeding plugging agent, the each addition of drill-feeding plugging agent is controlled at 0.5%, adopt CMP-3, KPAM, sulfonation inorganic agent etc. is made into glue, so that safeguard and the adjustment mud property, adjusts flow pattern with PSC, but, can not use strong dispersing agent; During 100m, drilling fluid adds 2～3% TYZ-8 in well before entering oil-gas Layer, 2～3% thick TQS-3 and thin TQS-3; Before electrical measurement, thoroughly clean well, adjust rheological characteristic, smooth to guarantee electrical measurement, setting of casing.

Claims

1. the configuration of a long section bore hole drilling fluid and maintaining method, it is characterized in that: top layer, top well section adopts multipolymer to suppress mud system, the bottom adopts polynary poly-sulphur system, directed net horizontal section to adopt poly-sulphur oil emulsion drilling fluid, and the collocation method of this drilling fluid is:

A. the multipolymer of stating the well section employing of top layer, top suppresses mud system and is: dispose swell soil magma 120～150m earlier ³, prescription is: talk water+0.2～0.3%NaOH+0.3～0.6%Na ₂CO ₃+ 5～8% swell soil, carry out in proper order by prescription during dosing, fully stir, hydration time 〉=16 hour, dispose glue again, prescription is: the well site water+little molecule 0.5～0.8% of caustic soda 0.1%+ polymer macromolecule 0.5～0.8%+ polymer, mix the drilling fluid that is made into top layer, top well section with swell soil magma then with glue;

B. the polynary poly-sulphur system that described lower well section adopts is: base slurry+KPAM0.1～0.2%+SMP _-12～3%+SPNH (PSC _-1) 2～3%+ sulfonated gilsonite or mulseal 2～5%+ sliding agent 0.5～2%+ agstone or blanc fixe;

C. the poly-sulphur oil emulsion drilling fluid that described directed net horizontal section adopts is the polynary poly-sulphur system based on top well section, and the dosage of CMP-3 is controlled at 0.1～0.2%, and the polymer macromolecule dosage is 2～3kg/m ³, sized molecules dosage ratio is (2～3): 1, and sliding agent dosage 0.5～1%, crude oil dosage are 3～5%, the SP-80 dosage is 0.5～1.5%, and adds RH-4 cleaning agent and Pluronic polyols SYP-1.

2. according to the configuration and the maintaining method of the described a kind of section of length bore hole drilling fluid of claim 1, it is characterized in that: the maintaining method of described drilling fluid is:

A. the maintaining method of the multipolymer inhibition mud system of top layer, top well section employing is: check the salinity of measuring well site water earlier, in drilling process, add glue, replenish prehydration swell soil magma, adopt the level Four well control, be lowered to the preceding well of cleaning of surface pipe;

B. the maintaining method of the polynary poly-sulphur system of lower well section employing is: clean mud settling tank before spudding in earlier, before boring the boiling water bod, use soda ash preliminary treatment drilling fluid, by 2～3kg/m ³Amount add macromolecule polyalcohol, add 1.0～1.5% sliding agents again, add 0.5～1% Pluronic polyols SYP-1 and cleaning agent RH-4 simultaneously, in drilling fluid, add 1～3% YL-80 and drill-feeding plugging agent, the each addition of drill-feeding plugging agent is 0.5%;

The maintaining method of the poly-sulphur oil emulsion drilling fluid that c. directed net horizontal section adopts is: clean mud settling tank at horizontal well drilling Duan Qianxian, use soda ash preliminary treatment drilling fluid before the drilling out, the drill-feeding plugging agent that in drilling fluid, adds YL-80 and 1～3%, the each addition of drill-feeding plugging agent is 0.5%, adopt CMP-3, KPAM, the sulfonation inorganic agent is made into glue, adjust rheological characteristic with PSC, ban use of strong dispersing agent, before entering oil-gas Layer during 100m, drilling fluid adds 2～3% TYZ-8 in well again, 2～3% thick TQS-3 and thin TQS-3 clean well and adjust rheological characteristic before electrical measurement.