CN1329125A - Water soluble drilling releasing stuck agent - Google Patents

Water soluble drilling releasing stuck agent Download PDF

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Publication number
CN1329125A
CN1329125A CN 01115907 CN01115907A CN1329125A CN 1329125 A CN1329125 A CN 1329125A CN 01115907 CN01115907 CN 01115907 CN 01115907 A CN01115907 A CN 01115907A CN 1329125 A CN1329125 A CN 1329125A
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China
Prior art keywords
acid
fatty acid
stuck
water
agent
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Granted
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CN 01115907
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Chinese (zh)
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CN1162505C (en
Inventor
李银素
黄献西
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Zhonghai Oil Field Service Co., Ltd.
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ZHONGHAI PETROLEUM TECHNOLOGY SCIENCE Co
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Priority to CNB011159073A priority Critical patent/CN1162505C/en
Publication of CN1329125A publication Critical patent/CN1329125A/en
Application granted granted Critical
Publication of CN1162505C publication Critical patent/CN1162505C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

A water-soluble stuck releasing agent for drilling operation includes two kinds of water-soluble non-ionic surfactants: fatty acid polyoxyethylene ester whose molecular formula is RCOO (CH2CH2O)nH and fatty alcohol-polyoxyethylenepolyoxypyropylene ether whose molecular formual RCO(CH2CH2O)a(CH2CH2CH2O)bH. The said invented water-soluble stuck releasing agent can be used as substitute for conventional oil base stuck freeing spotting fluid, and features good releasing effect and obvious mud cake crack, specially, it has no polution to seawater, can be directly discharged into sea, in particular, it is applicable to offshore drilling operation.

Description

Water soluble drilling releasing stuck agent
The present invention relates to a kind of water-soluble releasing stuck agent that is used for drilling operation.
Bit freezing in the petroleum drilling operation process is a serious problem, and the reason that causes bit freezing is many-sided, and is excessive as: the drill string resistance that rock of borehole and mud cake are produced during high speed rotating in well; During directional drilling, because the bending of well bore is bigger, drilling tool often contacts with the borehole wall, and friction resistance is excessive; During the high density drilling fluid drilling well, because the solid load height, resistance to flow is big, and filter cake stuck factor is big etc., under these several situations, all might produce lock of tool drilling, and it has caused the rising of drilling cost and the prolongation of rig time.
For a long time, people with crude oil, diesel oil etc. together with tensio-active agent as stuck freeing spotting fluid, raising along with environmental consciousness, conventional oil-based stuck freeing fluid is subjected to strict restriction, during drilling well especially at sea, for avoiding polluted seawater, these conventional stuck freeing spotting fluids all have to deliver to the land processing, have increased drilling cost.In order to address this problem, people replace oil-based stuck freeing fluid making great efforts to seek environmentally acceptable water base stuck freeing spotting fluid.
The object of the present invention is to provide a kind of water soluble drilling releasing stuck agent, as the surrogate of the oil-based stuck freeing fluid of routine.
Water-soluble releasing stuck agent of the present invention comprises two kinds of water soluble nonionic surfactants: molecular formula is RCOO (CH 2CH 2O) nThe polyoxyethylene carboxylate of H and molecular formula are RCO (CH 2CH 2O) a(CH 2CH 2CH 2O) bThe aliphatic alcohol polyethenoxy polyethenoxy ether of H, wherein, molecular formula RCOO (CH 2CH 2O) nLipid acid among the H is C 14-C 18Single fat acid, vegetables oil mixed fatty acid or animal oil fatty acid, n=8-12 in the formula; Molecular formula RCO (CH 2CH 2O) a(CH 2CH 2CH 2O) bThe moieties of Fatty Alcohol(C12-C14 and C12-C18) is C among the H 14-C 18Carbochain, a+b=11 and, a 〉=1, b 〉=1; The volume ratio of two kinds of nonionogenic tensides is 10: 1-2.
Except that above-mentioned two kinds of water soluble nonionic surfactants, also optionally comprise a kind of Fatty Alcohol(C12-C14 and C12-C18) in the releasing stuck agent of the present invention, the volume ratio of described two kinds of nonionogenic tensides and this Fatty Alcohol(C12-C14 and C12-C18) can be 10: 1-4: 0-1.
According to the preferred embodiment of the invention, in the molecular formula of polyoxyethylene carboxylate, described single fat acid comprises oleic acid, linolic acid etc.; The vegetables oil mixed fatty acid comprises rapeseed oil fatty acid, soy(a)-bean oil fatty acid, Castor Oil Fatty Acid, fatty acid distribution of coconut oil etc.; Animal oil fatty acid then comprises lard lipid acid, tallow fatty acid or the acid of sheep grease fat etc.And another kind of nonionogenic tenside, the Fatty Alcohol(C12-C14 and C12-C18) in the aliphatic alcohol polyethenoxy polyethenoxy ether can be any Fatty Alcohol(C12-C14 and C12-C18) that satisfies above-mentioned condition, promptly described Fatty Alcohol(C12-C14 and C12-C18) is C 14-C 18Any Fatty Alcohol(C12-C14 and C12-C18).The Fatty Alcohol(C12-C14 and C12-C18) that selectivity comprises is amylalcohol preferably.
Above-mentioned releasing stuck agent of the present invention is water miscible, will can be directly used in the unfreezing operation after each feed composition allotment, but for equilibrium strata pressure, can use its CaCl 2Or the aqueous solution of NaCl, to adjust the density of releasing stuck agent, adapt to the needs of operation, that is, can before use above-mentioned releasing stuck agent be made into CaCl 2Or the aqueous solution of NaCl, and by adjusting the concentration of calcium chloride or sodium chloride solution, the density that makes this releasing stuck agent solution is at 0.95-1.35.
So the present invention also provides a kind of water base stuck freeing spotting fluid, it is CaCl 2Or the aqueous solution of NaCl, the density of this water base stuck freeing spotting fluid is at 0.95-1.35
Releasing stuck agent of the present invention is a kind of nontoxic releasing stuck agent, is characterized in that unfreezing is effective, and the mud cake crackle is obvious, and is particularly pollution-free to seawater, can directly enter marinely, is particularly useful for Offshore Operation.
Below describe enforcement of the present invention in detail by specific embodiment and experimental result.
Embodiment 1
Get ricinolic acid polyoxyethylene ester 100ml, (polymerization degree n=10), tetradecyl alcohol polyoxyethylene poly-oxygen propylene aether (a=6, b=5) 40ml, join in the calcium chloride water of about 60ml 30% and stir, it is 1.20 that the amount by suitable adjustment calcium chloride makes the density of this stuck freeing spotting fluid.
Embodiment 2
Get soy(a)-bean oil fatty acid polyoxyethylene ester (polymerization degree n=10) 200m1, tetradecyl alcohol polyoxyethylene poly-oxygen propylene aether (a=6, b=5) 40ml, amylalcohol 10ml joins the calcium chloride by 120g, in the calcium chloride water that 100ml water is mixed with, stir, the density of this stuck freeing spotting fluid is 1.24.
Embodiment 3
Get lard acid polyoxyethylene ester (polymerization degree n=10) 100ml, (amylalcohol 10ml's tetradecyl alcohol polyoxyethylene poly-oxygen propylene aether stirs for a=6, b=5) 35ml, system salt water dissolubility releasing stuck agent.
Test example 1
The mud cake experiment test method of breaking
1, by Oil and Natural Gas Corporation's standard preparation base slurry: 4% Soil+0.1% iron complex salt (FCLS)+4% is estimated soil+0.1%CMC and is recorded base slurry performance such as following table with six fast rotational viscosimeters:
Table 1 base slurry performance
???φ600 ??φ300 ??????GEL Hmc (mm) The dehydration (ml) of base slurry
?????9 ?????6 ??????3/8 ?????1.5 ??????15
2, the mud cake experimental implementation program of breaking
A. mud cake breaks to test and carries out with the unfreezing instrument, puts a dry filter paper and assemble the unfreezing instrument in the unfreezing instrument of clean dried;
B. base was starched high-speed stirring 5 minutes, poured into then in the cup of unfreezing instrument, build lid, and at graduated cylinder of filtrate flow outlet underneath;
Connect the pressure assembly c. for the unfreezing instrument, with nitrogen pressure and timing, pressure is 500psi;
D. the time that leaches is 30min, record filtrate volume (15ml);
E. the stuck freeing spotting fluid that embodiment 1 and embodiment 2 are prepared is poured in the pressure filter, repeats c-d;
F. the stuck freeing spotting fluid on the careful water flushing mud cake, the surface crack of observation mud cake;
From the mud cake surface as can be seen, tangible map cracking all appears in the mud cake among two embodiment.
Test example 2
The unfreezing experiment
A. the unfreezing experiment is carried out with the unfreezing instrument;
B. operate by a-d in the test example 1, at first under 500psi pressure reduction, form one deck mud cake;
B. in the mud cake forming process, metal is dangled and be stuck on the mud cake with external pressure;
When c. reach 30min clamping time, mud is poured out, to annotate around suspending hammer and add a 5kg permanent load by the stuck freeing spotting fluid that embodiment 1 and embodiment 2 prescriptions are prepared, be recorded in stuck freeing spotting fluid experiment under the permanent load making dangle break away from mud cake time-this time is the unfreezing time.
Result such as following table
Table 2 unfreezing experimental result
The experiment order The base slurry unfreezing time The stuck freeing spotting fluid unfreezing time Remarks
?1 ＞60min is unfreezing not 25min Embodiment 1
?2 ＞60min is unfreezing not 18min Embodiment 1
?3 ＞60min is unfreezing not 20min Embodiment 2
?4 ＞60min is unfreezing not 16min Embodiment 2

Claims (6)

1, a kind of water soluble drilling releasing stuck agent, it comprises two kinds of water soluble nonionic surfactants: molecular formula is RCOO (CH 2CH 2O) nThe polyoxyethylene carboxylate of H; With molecular formula be RCO (CH 2CH 2O) a(CH 2CH 2CH 2O) bThe aliphatic alcohol polyethenoxy polyethenoxy ether of H;
Wherein, molecular formula RCOO (CH 2CH 2O) nLipid acid among the H is C 14-C 18Single fat acid, vegetables oil mixed fatty acid or animal oil fatty acid, n=8-12 in the formula;
Molecular formula RCO (CH 2CH 2O) a(CH 2CH 2CH 2O) bThe moieties of Fatty Alcohol(C12-C14 and C12-C18) is C among the H 14-C 18Carbochain, a+b=11 and, a 〉=1, b 〉=1;
The volume ratio of two kinds of nonionogenic tensides is 10: 1-4.
2, the releasing stuck agent of claim 1, it also optionally comprises a kind of Fatty Alcohol(C12-C14 and C12-C18), the volume ratio of described two kinds of nonionogenic tensides and this Fatty Alcohol(C12-C14 and C12-C18) is 10: 1-4: 0-2.
3, the releasing stuck agent of claim 1, wherein, described single fat acid comprises oleic acid, linolic acid; The vegetables oil mixed fatty acid comprises rapeseed oil fatty acid, soy(a)-bean oil fatty acid, Castor Oil Fatty Acid, fatty acid distribution of coconut oil; Animal oil fatty acid comprises lard lipid acid, tallow fatty acid or the acid of sheep grease fat.
4, the described releasing stuck agent of claim 2, wherein this Fatty Alcohol(C12-C14 and C12-C18) is an amylalcohol.
5, each described releasing stuck agent of claim 1-4, it is the aqueous solution of calcium chloride or sodium-chlor, and the density of this releasing stuck agent aqueous solution is 0.95-1.35.
6, a kind of water-based drilling stuck freeing spotting fluid, it is the calcium chloride of each described water-soluble releasing stuck agent of claim 1-4 or the aqueous solution of sodium-chlor, the density of this stuck freeing spotting fluid is 0.95-1.35.
CNB011159073A 2001-04-30 2001-04-30 Water soluble drilling releasing stuck agent Expired - Fee Related CN1162505C (en)

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CN1162505C CN1162505C (en) 2004-08-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1331978C (en) * 2004-12-09 2007-08-15 中国石油天然气股份有限公司 Polyalcohol lubrication inhibitor for well drilling liquid and its application
CN100363455C (en) * 2004-10-29 2008-01-23 中国石油化工股份有限公司 Positive electricity water-base pipe-freeing concentrate and its preparation method
CN101638574B (en) * 2009-08-25 2012-07-04 谢军 Acid-in-oil stuck freeing fluid and production method and use method thereof
CN104211075A (en) * 2013-06-04 2014-12-17 中国石油化工股份有限公司 Preparation method of organic bentonite for oil based drilling fluid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101362942B (en) * 2008-09-26 2011-09-28 大庆石油管理局 Formation opener agent for low permeable reservoir of oilfield

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100363455C (en) * 2004-10-29 2008-01-23 中国石油化工股份有限公司 Positive electricity water-base pipe-freeing concentrate and its preparation method
CN1331978C (en) * 2004-12-09 2007-08-15 中国石油天然气股份有限公司 Polyalcohol lubrication inhibitor for well drilling liquid and its application
CN101638574B (en) * 2009-08-25 2012-07-04 谢军 Acid-in-oil stuck freeing fluid and production method and use method thereof
CN104211075A (en) * 2013-06-04 2014-12-17 中国石油化工股份有限公司 Preparation method of organic bentonite for oil based drilling fluid

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Assignee: COSL Chemicals (Tianjin) Co., Ltd.

Assignor: China Oilfield Services Limited

Contract fulfillment period: 2008.2.1 to 2021.1.1 contract change

Contract record no.: 2008990000061

Denomination of invention: Water soluble drilling releasing stuck agent

Granted publication date: 20040818

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Record date: 2008.4.7

LIC Patent licence contract for exploitation submitted for record

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