CN100516457C - Chemical pulse compound unplugging method - Google Patents
Chemical pulse compound unplugging method Download PDFInfo
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- CN100516457C CN100516457C CNB2006100706922A CN200610070692A CN100516457C CN 100516457 C CN100516457 C CN 100516457C CN B2006100706922 A CNB2006100706922 A CN B2006100706922A CN 200610070692 A CN200610070692 A CN 200610070692A CN 100516457 C CN100516457 C CN 100516457C
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Abstract
The present invention relates to a chemicals and pulse combined blocking removing method. It is characterized by that under the condition of that the pipe string is not moved adopting the following steps: selecting chemicals and defining dose; utilizing wellhead casing pipe to connect cementing truck by means of pipeline; directly injecting chemicals into wellbore and reservoir, after the chemicals injection is completed, closing casing pipe and making reaction for 2-3 hr, then connecting pulse generator, injecting gas into wellbore by means of casing pipe to make well interior pressure be reached to a certain value, then utilizing pulse generator to produce pressure pulse wave, and utilizing said pressure pulse wave to remove blocking things.
Description
One, technical field
The present invention relates to field of petroleum exploitation, belong to oil production technology de-plugging process technology, specifically a kind of chemical pulse compound unplugging method.
Two, background technology
Along with no matter the prolongation of oil field development time is oil (gas) well or water injection well, its production capacity index or injectivity index all can significantly decrease.Its main cause is because shale, deposit, various emulsion, paraffin, gum asphalt and other mechanical admixtures stop up pore channel, reservoir permeability is descended, and cause production fluid amount or water injection rate to descend.Shale in drilling process and the well cementation process or cement paste all can produce near the oil reservoir borehole wall and pollute, and the kill-job work in the well workover process also can be polluted the stratum sometimes.Above-mentioned multiple factor all can cause reducing the penetrating power of oil reservoir near wellbore zone, thereby influences the ordinary production of oil-water well.This problem becomes serious restriction always and influences oil field development, increases the principal element that cost of production reduces economic benefit.Therefore handle the stratum and recover the near wellbore zone permeability, just become and improve oil-water well output in the oilfield development process, keep one of important measures of stable, high yield and raising recovery ratio.
Handle on stratum to individual well, except that the acidifying of routine, pressure break, the nearly two a series of physical methods that grow up have gradually during the last ten years all been obtained certain effect as method for removing blockage such as hydraulic oscillation, electro-hydraulic impulse, ultrasonic wave, high enegry gas fracturing and high-pressure water jets.But said method all in various degree exist shortcoming such as construction complexity etc., need repeatedly lower tubular column, and selectivity is subjected to certain restriction, thereby treatment effect also had certain influence.Therefore will improve treatment effect greatly if physical method and chemical method can be combined.Have broad application prospects and important Research Significance.
Three, summary of the invention
The purpose of this invention is to provide a kind of chemical pulse compound unplugging method, solve construction complexity that above-mentioned prior art exists, employ tubing string often, the unfavorable problem of plugging removal effect.
Technical scheme of the present invention realizes in the following manner:
Under fixed tubular column ground situation, select after chemical agent and the consumption, by picking out pipeline, connect cementing truck at the well head sleeve pipe, directly, after medicament injects and finishes, closed the cover tube reaction 2～3 hours to pit shaft and oil reservoir perfusion chemical agent.Connect impulse generator then, by sleeve pipe to the pit shaft injecting gas, after making borehole pressure reach certain value, utilize impulse generator pressing force gradient rapid depressurization, produce pressure pulse wave and make the formation blockage thing under the compression wave effect of positive and negative both direction checker, produce the complex effect of pulse and chemical plugging removal agent.Except having two kinds of effects of doing the time spent separately, also make it obtain the better synthesis effect, thereby improved the action effect of chemical pulse compound unplugging technology by synergistic mechanism.
Pressure pulse number of times and will being optimized when determining site operation to the pressure amplitude according to the construction concrete geological condition of well and plugging reason:
1, loose sand oil accumulation easily adopts the form of construction work of little amplitude multiple-pulse number of times because of general reason causes the oil-water well of output decline when de-plugging is constructed, can not adopt big pulse in order to avoid cause formation sand production, cause sand to bury oil reservoir, with 2Mpa is that barometric gradient improves pressure one by one, be no more than 10Mpa, the pulse release barometric gradient is identical with it.
2, firm stratum and stop up serious oil well and take to improve injection pressure when de-plugging is constructed, corresponding raising release pressure gradient reduces pulse number.
Make pressure pulse and chemically composited de-plugging obtain ideal effect, should note choosing different chemical agents, the preceding injection of pulse construction is arranged at dissimilar stratum or dissimilar plugging reason.Its basic matching principle is:
1, to because of organic substances such as viscous crude and gum asphalt, wax stop up the well that causes oil-water well output to reduce, injects thinner, Wax dissolving agent.
2, to because of mechanical admixture, mud and other inorganic matter stop up the well that causes output to reduce, inject cleaning agent.
3, or silt particle stifled because of liquid are stopped up the oil well that causes output to reduce, inject acid de-plugging agent.
4, the working concentration of chemical agent is determined according to the feed flow situation of concrete oil well, injects radius 1m.
The present invention constructs simply, does not employ tubing string, has shortened construction period, has saved construction cost, has improved the de-plugging of well effect, has increased crude output.
Four, description of drawings
Accompanying drawing is a construction process schematic diagram of the present invention
1-pulse controller 2-threeway 3-gas or medicament ascending pipe 4-oil pipe 5-oil reservoir 6-sleeve pipe 7-pressure monitor among the figure
Five, the specific embodiment
For further disclosing technical scheme of the present invention, elaborate by embodiment below in conjunction with Figure of description:
Under fixed tubular column ground situation, select after chemical agent and the consumption, by picking out pipeline, connect cementing truck at the well head sleeve pipe, directly, after medicament injects and finishes, closed the cover tube reaction 2～3 hours to pit shaft and oil reservoir perfusion chemical agent.Connect impulse generator then, by sleeve pipe to the pit shaft injecting gas, after making borehole pressure reach certain value, utilize impulse generator pressing force gradient rapid depressurization, produce pressure pulse wave and make the formation blockage thing under the compression wave effect of positive and negative both direction checker, produce the complex effect of pulse and chemical plugging removal agent.Except having two kinds of effects of doing the time spent separately, also make it obtain the better synthesis effect, thereby improved the action effect of chemical pulse compound unplugging technology by synergistic mechanism.
Example 1:GD1-7-411 well, core intersection 5.1m, 2006 8 monthly average days production fluid 5.5m
3, think in the manufacturing process it is that the shale migration results in blockage to sand control pipe and nearly well area exists and pollutes, design utilizes pressure pulse to oil reservoir impacts of fluctuating, and composite acidification blocking remover removes the pollutant and the obstruction of nearly well area, dredges the stratum.
This well was constructed on August 29th, 2006, and motionless flow string 4 injects 5m with 400 type cementing trucks from threeway 2 ascending pipes 3
3Acidification blocking remover injects oil reservoir 5 from sleeve pipe 6.Stoste 0.8t, preparation back working concentration 20%, treatment radius is 1m, the injection pump pressure is stable and less than 12Mpa, closing well reacted 2-3 hour.Threeway 2 and pressure pulse generator 1 are connected the sleeve gate outside, connect impulse generator control device power supply, and the pressure pulse controller is placed the upwind place; open unit then; give the sleeve pipe supercharging, pressure monitor 7 monitorings, injection pressure degree 2Mpa; when casing pressure reached each barometric gradient 5 minutes at interval; when reaching setting value 12Mpa, the shutdown group, the controlled pressure impulse generator is put and is pressed gradient 2Mpa; put gradually and be pressed onto 0, and put intermittently 2-3min of pressure point what set.
Day liquid 44.2m behind this well construction
3/ d, same 9.6t/d on average increases day by day.
Example 2:GD2-28X239 well, core intersection 6.8m, 2006 9 monthly average days production fluid 5.1m
3, think that oil is thick in the manufacturing process to cause nearly well area to stop up that design utilizes pressure pulse to oil reservoir impacts of fluctuating, and composite thinner removes the viscous crude obstruction of nearly well area, dredges the stratum.
This well was constructed on September 7th, 2006, and motionless flow string injects 6m with 400 type cementing trucks
3Heavy crude thinner stoste 0.6t, preparation back working concentration 10%, treatment radius is 1m, the injection pump pressure is stable and less than 12Mpa, closing well reacted 2-3 hour.Threeway and pressure pulse generator are connected the sleeve gate outside; connect impulse generator control device power supply; and the pressure pulse controller placed the upwind place; open unit then; give the sleeve pipe supercharging, shutdown group when casing pressure reaches near setting value 12Mpa, the controlled pressure impulse generator is put and is pressed gradient 2Mpa; put gradually and be pressed onto 0, and put intermittently 2-3min of pressure point what set.
Day liquid 29.3m behind this well construction
3/ d, the liquid 24.1t/d that on average increases day by day, oily 7.6t/d increases day by day.
Claims (7)
1, a kind of chemical pulse compound unplugging method, it is characterized in that under the fixed tubular column situation, select after chemical agent and the consumption, by picking out pipeline at the well head sleeve pipe, connect cementing truck, directly to pit shaft and oil reservoir perfusion chemical agent, after medicament injects and finishes, close cover tube reaction 2～3 hours, connect impulse generator then, by sleeve pipe to the pit shaft injecting gas, after making borehole pressure reach certain value, utilize impulse generator pressing force gradient rapid depressurization, produce pressure pulse wave and make the formation blockage thing under the compression wave effect of positive and negative both direction checker, produce the complex effect of pulse and chemical plugging removal agent.
2, chemical pulse compound unplugging method according to claim 1, it is characterized in that loose sand oil accumulation adopts the form of construction work of little amplitude multiple-pulse number of times because of general reason causes the oil-water well of output decline when de-plugging is constructed, can not adopt big pulse in order to avoid cause formation sand production, cause sand to bury oil reservoir, with 2Mpa is that barometric gradient improves pressure one by one, be no more than 10Mpa, the pulse release barometric gradient is identical with it.
3, chemical pulse compound unplugging method according to claim 1 is characterized in that firm stratum and stops up serious oil well and take to improve injection pressure when de-plugging is constructed, and corresponding raising release pressure gradient reduces pulse number.
4, chemical pulse compound unplugging method according to claim 1 is characterized in that injecting thinner, Wax dissolving agent to because of viscous crude and gum asphalt, wax organic substance stop up the well that causes oil-water well output to reduce.
5, chemical pulse compound unplugging method according to claim 1 is characterized in that injecting cleaning agent to because of mechanical admixture, mud and other inorganic matter stop up the well that causes output to reduce.
6, chemical pulse compound unplugging method according to claim 1 is characterized in that or silt particle stifled because of liquid are stopped up the oil well that causes output to reduce, and injects acid de-plugging agent.
7, chemical pulse compound unplugging method according to claim 1 is characterized in that the working concentration of chemical agent is determined according to the feed flow situation of concrete oil well, injects radius 1m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100706922A CN100516457C (en) | 2006-12-09 | 2006-12-09 | Chemical pulse compound unplugging method |
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| CNB2006100706922A CN100516457C (en) | 2006-12-09 | 2006-12-09 | Chemical pulse compound unplugging method |
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| CN1975103A CN1975103A (en) | 2007-06-06 |
| CN100516457C true CN100516457C (en) | 2009-07-22 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418680B (en) * | 2007-10-23 | 2011-12-14 | 王长俊 | Gas lift unblocking technology by chemical method |
| CN101915082A (en) * | 2010-07-22 | 2010-12-15 | 中国石油天然气股份有限公司 | Method for removing blockage of oil-water well through magnetic positioning pulse acidification |
| CN105089562A (en) * | 2014-05-04 | 2015-11-25 | 克拉玛依新科澳石油天然气技术股份有限公司 | Preheating variable-frequency injection unblocking process system for water injection well |
| CN104033138A (en) * | 2014-06-04 | 2014-09-10 | 中国石油大学(华东) | Device and method for integrating functions of steam injection fluctuation and chemical blocking removal of heavy oil reservoir without removing tubular columns |
| CN106522908A (en) * | 2016-10-13 | 2017-03-22 | 广汉市思科信达科技有限公司 | Acoustic wave oil layer treatment device |
| CN106401548A (en) * | 2016-10-13 | 2017-02-15 | 广汉市思科信达科技有限公司 | Ultrasonic oil reservoir treatment system |
| CN106351632A (en) * | 2016-10-13 | 2017-01-25 | 广汉市思科信达科技有限公司 | Low-frequency sound wave processing device for oil layer |
| CN106555579A (en) * | 2017-01-01 | 2017-04-05 | 陕西海山能源发展有限公司 | A kind of oil-water well fixed tubular column acidification technique system |
| CN108049852B (en) * | 2017-11-07 | 2019-08-13 | 华中科技大学 | Frscturing device and method based on liquid electric pulse shock wave and chemical agent augmented injection |
| CN108979605A (en) * | 2018-09-18 | 2018-12-11 | 中国石油集团西部钻探工程有限公司 | The method of impulse wave heavy crude producing device and impulse wave heavy crude producing |
| CN110043225B (en) * | 2019-04-16 | 2021-06-18 | 西安益特能源科技有限公司 | Underground reverse hydraulic blockage removal method |
| CN110174342B (en) * | 2019-06-06 | 2022-02-11 | 中国石油大学(华东) | Shaft ultrasonic wave-acidification composite blockage removal simulation experiment device and method |
| CN110219627A (en) * | 2019-06-19 | 2019-09-10 | 中国海洋石油集团有限公司 | A method of enhancing offshore oilfield oil well acidation effect |
| CN110243692B (en) * | 2019-07-02 | 2022-01-11 | 中国石油大学(华东) | Testing experimental device and method for mechanical parameters of pulsating composite acidized saturated rock |
| CN112324406B (en) * | 2020-11-02 | 2022-10-25 | 王战勇 | Nano-pulse high-pressure blockage removal, pressure reduction and storage increase method for low-permeability water-sensitive oil reservoir water well |
| CN113124186B (en) * | 2021-04-22 | 2023-06-02 | 中海油田服务股份有限公司 | Blocking removing system |
| CN113374452A (en) * | 2021-06-02 | 2021-09-10 | 山东德仕石油装备有限公司 | Thickened oil cold production viscosity reduction method for improving fluidity and application |
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2006
- 2006-12-09 CN CNB2006100706922A patent/CN100516457C/en not_active Expired - Fee Related
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| 复合解堵技术在辽河油区的应用. 贾选红.特种油气藏，第12卷第3期. 2005 |
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