CN103670360A - Method for removing oil-gas well barite blocking and adopted working solution - Google Patents
Method for removing oil-gas well barite blocking and adopted working solution Download PDFInfo
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- CN103670360A CN103670360A CN201310722290.6A CN201310722290A CN103670360A CN 103670360 A CN103670360 A CN 103670360A CN 201310722290 A CN201310722290 A CN 201310722290A CN 103670360 A CN103670360 A CN 103670360A
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Abstract
The invention relates to a method for removing oil-gas well barite blocking. The method comprises the first step of allocating a working solution which comprises, by mass concentration, 1-1.2% of nitrilortiacetic acid, 1-1.2% of 4-methyl benzenesulfonic acid pyridine, 0.3-0.8% of 2-butanone sodium alginate, 1-1.5% of sodium chloride, 1-1.2% of poly chlorinated dimethyl diallylamine and 0.1-0.2% of polyacrylamide; the second step of opening a well for gushing, gaining the original capacity and recording the oil pressure observed before blocking removing; the third step of injecting the working solution which is obtained in the first step from an oil pipe and is capable of dispersing and corroding barites under the high pressure, wherein the flow is 2-4m<3>/min, the volume of the added working solution ranges from 200m<3> to 300m<3>, the well closing immersing reaction is carried out for 4 hours, the immersing temperature ranges from 100 DEG C to 160 DEG C, the working solution is injected under the crack opening condition; the fourth step of opening the well for controlling gushing and flowback and gaining the capacity after blocking removing. The method for removing the oil-gas well barite blocking is adopted, the pollution to the immediate vicinity of wellbore from barites is removed after an oil-gas well is drilled and during the process of well repairing by corroding and dispersing the barites, and a target oil-gas layer seepage channel is recovered.
Description
Technical field
The invention belongs to energy industry, oil-gas field development field, for well production increment, especially a kind of working solution of removing Oil/gas Well barite obstruction method and adopting.
Background technology
Along with marine and land oilfield prospecting developing develop in depth, deep-well, ultradeep well probing quantity increase, high density heavy weight additive is more and more by general making an addition in drilling fluid, but adding of heavy weight additive increases solids content of drilling fluid, causing, in drilling process, heavy weight additive sedimentation occurs invades, cause stratum solid phase to stop up, even have a strong impact on oil well output.
Barite is solid phase weighting material common in drilling fluid, and barite easily damages reservoir, is mainly reflected in: 1, seriously stop up seepage flow duct, pollute stratum, affect output and recovery ratio; 2, cause misjudgment, None-identified oil-gas Layer; 3, the utmost point is difficult to resolve and removes, and adopts general acid washing method to remove.
For above-mentioned bar releasing, be a difficult problem in industry, existing acid washing method can not reach the object of removal always, and this problem is urgently to be resolved hurrily.
According to the retrieval, find following patent documentation, concrete disclosure is as follows:
1, a kind of system (CN200710098877.9) that reclaims the barite in weighted drilling fluid and get rid of useless solid phase, comprise: prime centrifuge and rear class centrifuge, pending drilling fluid will weigh brilliant through prime centrifuge, after stone is separated, be separated bar drilling fluid and through rear class centrifuge, cutting grain separated, the drilling fluid obtaining mixes with the barite of previously having separated.This invention is by the system of a set of organic connections; two desk centrifuges are connected in series together; divide two step process drilling fluids; the efficient separation of barite, the barite that have solved during weighted drilling fluid is processed reclaim dispersion, prevent barite precipitation, improve the problems such as weighted drilling fluid treatment effeciency simultaneously; reclaiming most of bar whiles, most of cutting grain of having drained, has greatly reduced bar consumption; both save cost, also protected environment.
2, a kind of Wellbore of Gas Wells de-plugging agent (CN102746838A), by being weight percentage: alcohol ether compound: 5～25%; Dispersing agent: 0.5～10%; Cleaning agent: 1～10%; Chelating agent: 0.5～5%, nitrogenous class polar solvent: surplus; Described nitrogenous class polar solvent is selected from DMF, N, one of N dimethylacetylamide, 1-METHYLPYRROLIDONE; Described alcohol ether compound is one of glycol-ether, ethylene glycol-propyl ether, ethylene glycol-ether or carbitol; Described dispersing agent is the middle phase micro-emulsified liquid type dispersing agent that kerosene, water, surfactant, cosurfactant are mixed to form, and in dispersing agent, particle size analysis is 20～100nm; Described cleaning agent is one of allene diamines, acetonitrile, amylamine; Described chelating agent is one of natrium citricum, EDTA.
3, a kind of oil reservoir de-plugging agent (CN102775975A), comprises A agent, B agent, A agent percentage by weight 25～35%; The percentage by weight 65～75% of B agent; Each component percentage by weight sum is absolutely; A agent each component percentage by weight is: oil mixed xylenes: 45～50%; Nonyl phenol polyoxyethylene (4) ether (OP-4): 1～2%; All the other are No. 0 diesel oil; A agent each component percentage by weight sum is absolutely; B agent each component percentage by weight is: glacial acetic acid or sulfamic acid: 6～10%; Ammonium acid fluoride: 2～2.5%; Ammonium chloride: 2%; Citric acid: 1～2%; Corrosion inhibiter 7801:1.5～2%; The tert-butyl alcohol: 3～5%; Octyl phenol polyoxyethylene (10) ether (OP-10): 0.5～1%; All the other are water; B agent each component percentage by weight sum is absolutely.
Above-mentioned patent does not solve for bar blockage problem, different from the application's subject matter, and technical scheme is different, and the technique effect of acquisition is different.
Summary of the invention
The object of the present invention is to provide a kind of working solution of removing Oil/gas Well barite obstruction method and adopting, this releasing barite obstruction method can be by corrosion, dispersion barite, remove barite in Oil/gas Well drilling process and, in the pollution of near wellbore zone, recover object oil reservoir air infiltration circulation road.
The technical scheme that the present invention realizes object is as follows:
A releasing Oil/gas Well barite obstruction method, step is as follows:
(1) configuration effort liquid: its composition and weight percent concentration are: nitrilotriacetic acid 1-1.2%, 4-toluene sulfonic acide pyridine 1-1.2%, 2-batanone acid sodium salt 0.3-0.8%, sodium chloride 1-1.5%, poly-dimethyldiallylammonium chloride 1-1.2%, polyacrylamide 0.1-0.2%;
(2) the open flow that drives a well, asks for original production capacity, records the information such as the oil pressure observed before de-plugging and oil and gas production;
(3) under elevated pressures, from oil pipe or completion tubular column, inject and (1) have dispersion, the bar working solution of corrosion, infusion flow is 2-4m
3/ min, adds 200m
3-300m
3, closing well soaks reaction 4 hours, and soaking temperature 100-160 ℃ injects barite de-plugging working solution under the condition of fracture open;
(4) drive a well and control open flow, the row of returning, ask for production capacity after de-plugging.
And working solution de-plugging construction infusion conditional request is fully opened formation fracture.
And described working solution is weight percentage: nitrilotriacetic acid 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride 1.0%, polyacrylamide 0.1%.
And described polyacrylamide is the poly-propionamide of straight chain.
Remove the working solution that Oil/gas Well barite stops up, its composition and weight percent concentration are: nitrilotriacetic acid 1-1.2%, 4-toluene sulfonic acide pyridine 1-1.2%, 2-batanone acid sodium salt 0.3-0.8%, sodium chloride 1-1.5%, poly-dimethyldiallylammonium chloride 1-1.2%, polyacrylamide 0.1-0.2%.
And described working solution is weight percentage: nitrilotriacetic acid 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride 1.0%, polyacrylamide 0.1%.Innovative point of the present invention have following some:
1, the present invention adopts releasing barite obstruction method by corrosion, dispersion barite, to remove barite in Oil/gas Well drilling process and, in the pollution of near wellbore zone, to recover object oil reservoir air infiltration circulation road.
2, this method can be processed the barite in stratum effectively, removes the obstruction of barite to stratum, effectively improves the seepage environment on stratum, finally makes Oil/gas Well oil and gas production be increased.
3, the present invention adopts brand-new dispersion, the bar working solution of corrosion, and then working solution can discharge bottom PetroChina Company Limited. by the barite corrosion in crack, improves the output of oil.
The specific embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
All substances of the present invention are commercially available.
Embodiment 1
A releasing Oil/gas Well barite obstruction method, step is as follows:
(1) configuration effort liquid: its composition and weight percent concentration are: nitrilotriacetic acid (NTA) 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride (PDDA) 1.0%, polyacrylamide 0.1%;
(2) the open flow that drives a well, asks for original production capacity, records the oil pressure of observing before de-plugging;
Note: after recording oil pressure and being convenient to de-plugging and having constructed, contrast with production capacity after de-plugging, evaluate plugging removal effect.
(3) under elevated pressures, from oil pipe, inject and (1) have dispersion, the bar working solution of corrosion, flow is 2-4m
3/ min, adds 200m
3-300m
3, closing well soaks reaction 4 hours, and soaking temperature 100-160 ℃ injects working solution under the condition of fracture open;
The pressure adopting generally, higher than boring completion interval of well bottom pressure, a little more than fracture open pressure, exceeds about 3-5MPa, the general 90-110MPa of bottom pressure.
Under elevated pressures, inject working solution, mainly in order to inject working solution under intrinsic fracture opens condition as far as possible, allow de-plugging agent mainly enter into contaminated intrinsic fracture, it is fully contacted with barite, in work progress, need the accurate consumption of admission squeezing working solution and the parameter in squeezing process, comprise: pump pressure, discharge capacity, beginning and ending time, abnormal conditions etc., the well head pressure between the accurate recording closing well stage of reaction changes, and well opening time, oil jacket are pressed variation, abnormal conditions etc.
(4) drive a well and control open flow, the row of returning, ask for production capacity after de-plugging, carry out plugging removal effect evaluation, through after this processings, production capacity raising 100%.
How to judge plugging removal effect:
For example: observe oil pressure before de-plugging, if oil pressure in 10MPa, more than becoming 10MPa after de-plugging, after de-plugging output than de-plugging before output increase, de-plugging success.
Embodiment 2
A releasing Oil/gas Well barite obstruction method, step is as follows:
(1) configuration effort liquid: its composition and weight percent concentration are: nitrilotriacetic acid (NTA) 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride 1.0%, straight chain polyacrylamide 0.1%;
(2) the open flow that drives a well, asks for original production capacity, records the oil pressure of observing before de-plugging;
Note: after recording oil pressure and being convenient to de-plugging and having constructed, contrast with production capacity after de-plugging, evaluate plugging removal effect.
(3) under elevated pressures, from oil pipe, inject and (1) have dispersion, the bar working solution of corrosion, flow is 2-4m
3/ min, adds 200m
3-300m
3, closing well soaks reaction 4 hours, and soaking temperature 100-160 ℃ injects working solution under the condition of fracture open;
The pressure adopting generally, higher than boring completion interval of well bottom pressure, a little more than fracture open pressure, exceeds about 3-5MPa, the general 90-110MPa of bottom pressure.
(4) drive a well and control open flow, the row of returning, ask for production capacity after de-plugging, carry out plugging removal effect evaluation, through after this processings, production capacity raising 200%.
Claims (6)
1. remove an Oil/gas Well barite obstruction method, it is characterized in that: step is as follows:
(1) configuration effort liquid: its composition and weight percent concentration are: nitrilotriacetic acid 1-1.2%, 4-toluene sulfonic acide pyridine 1-1.2%, 2-batanone acid sodium salt 0.3-0.8%, sodium chloride 1-1.5%, poly-dimethyldiallylammonium chloride 1-1.2%, polyacrylamide 0.1-0.2%;
(2) the open flow that drives a well, asks for original production capacity, records the information such as the oil pressure observed before de-plugging and oil and gas production;
(3) under elevated pressures, from oil pipe or completion tubular column, inject and (1) have dispersion, the bar working solution of corrosion, infusion flow is 2-4m
3/ min, adds 200m
3-300m
3, closing well soaks reaction 4 hours, and soaking temperature 100-160 ℃ injects barite de-plugging working solution under the condition of fracture open;
(4) drive a well and control open flow, the row of returning, ask for production capacity after de-plugging.
2. releasing Oil/gas Well barite obstruction method according to claim 1, is characterized in that: working solution de-plugging construction infusion conditional request is fully opened formation fracture.
3. releasing Oil/gas Well barite obstruction method according to claim 1, it is characterized in that: described working solution is weight percentage: nitrilotriacetic acid 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride 1.0%, polyacrylamide 0.1%.
4. releasing Oil/gas Well barite obstruction method according to claim 1, is characterized in that: described polyacrylamide is the poly-propionamide of straight chain.
5. remove the working solution that Oil/gas Well barite stops up, it is characterized in that: its composition and weight percent concentration are: nitrilotriacetic acid 1-1.2%, 4-toluene sulfonic acide pyridine 1-1.2%, 2-batanone acid sodium salt 0.3-0.8%, sodium chloride 1-1.5%, poly-dimethyldiallylammonium chloride 1-1.2%, polyacrylamide 0.1-0.2%.
6. the working solution that releasing Oil/gas Well barite according to claim 5 stops up, it is characterized in that: described working solution is weight percentage: nitrilotriacetic acid 1.0%, 4-toluene sulfonic acide pyridine 1.0%, 2-batanone acid sodium salt 0.5%, sodium chloride 1.0%, poly-dimethyldiallylammonium chloride 1.0%, polyacrylamide 0.1%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410631164.4A CN104533369B (en) | 2013-12-24 | 2013-12-24 | Method for relieving barite blockage of oil gas well |
| CN201310722290.6A CN103670360B (en) | 2013-12-24 | 2013-12-24 | Working solution for removing oil-gas well barite blocking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722290.6A CN103670360B (en) | 2013-12-24 | 2013-12-24 | Working solution for removing oil-gas well barite blocking |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410631164.4A Division CN104533369B (en) | 2013-12-24 | 2013-12-24 | Method for relieving barite blockage of oil gas well |
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|---|---|
| CN103670360A true CN103670360A (en) | 2014-03-26 |
| CN103670360B CN103670360B (en) | 2015-02-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2095546C1 (en) * | 1997-02-18 | 1997-11-10 | Закрытое акционерное общество "Нефть Заволжья" | Method for treatment of wells |
| CN101418680A (en) * | 2007-10-23 | 2009-04-29 | 王长俊 | Gas lift unblocking technology by chemical method |
| CN102278092A (en) * | 2011-07-12 | 2011-12-14 | 西安石油大学 | Biological enzyme blocking removal process for blocking of inorganic scaling contained in strata |
| CN102337111A (en) * | 2011-07-12 | 2012-02-01 | 西安石油大学 | Bio-enzyme blockage removal production promoter and application thereof |
| CN102746838A (en) * | 2011-04-22 | 2012-10-24 | 中国石油天然气股份有限公司 | Blocking remover of gas well shaft |
-
2013
- 2013-12-24 CN CN201310722290.6A patent/CN103670360B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2095546C1 (en) * | 1997-02-18 | 1997-11-10 | Закрытое акционерное общество "Нефть Заволжья" | Method for treatment of wells |
| CN101418680A (en) * | 2007-10-23 | 2009-04-29 | 王长俊 | Gas lift unblocking technology by chemical method |
| CN102746838A (en) * | 2011-04-22 | 2012-10-24 | 中国石油天然气股份有限公司 | Blocking remover of gas well shaft |
| CN102278092A (en) * | 2011-07-12 | 2011-12-14 | 西安石油大学 | Biological enzyme blocking removal process for blocking of inorganic scaling contained in strata |
| CN102337111A (en) * | 2011-07-12 | 2012-02-01 | 西安石油大学 | Bio-enzyme blockage removal production promoter and application thereof |
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| CN103670360B (en) | 2015-02-11 |
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Address after: 065001 Langfang economic and Technological Development Zone, Hebei Road, No. 600 Patentee after: LANGFANG CHRONOTECH PETROLEUM TECHNOLOGY CO., LTD. Address before: 065001 Langfang economic and Technological Development Zone, Hebei Road, No. 600 Patentee before: Langfang Chronotech Petroleum Technology Co., Ltd. |