CN101158280A - Oil well high water-bearing layer pressure blocking method - Google Patents
Oil well high water-bearing layer pressure blocking method Download PDFInfo
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Abstract
The invention relates to a pressure-blocking plan used for a high water-containing layer of an oil well. The invention is characterized in that the plan comprises pipe column blocking, blocking-medium injection, clean water exchanging, coagulation waiting, pressure-split work implement, etc. work procedures; a nature-improved macromolecule acrylamide is used as a main agent, and under the effect of a coupling agent and a setting accelerator, a coupling happens under a stratum to form a micro-expansion form which can effectively block the manual cracks and natural cracks of the high water-containing layer of the original oil well. And the breaking pressure is larger than a cracking pressure, a pressure-split work can be done later to generate new manual cracks. And a water-coming direction of the high water-containing layer of the original oil well can be blocked and manual cracks on new directions are generated to communicate with partial left oils so as to enhance extraction efficiency of the oil well and to enlarge an affected area to raise the raw oil production and the extracting rate.
Description
Technical field
The present invention relates to field of petroleum exploitation, particularly a kind of oil well high water-bearing layer pressure blocking method is mainly used in the remaining reserves of exploiting high watercut layer.
Background technology
Along with the prolongation of oil field development time, the high water-cut well number increases year by year, and the routine techniques measure can't realize further taping the latent power of remaining oil.Can present well water accounts for 60.8% greater than 80% waterflood interval, therefore, further employ the remaining reserves of major oil reservoir, and is significant to improving the individual well recovery percent of reserves.
Summary of the invention
Purpose of the present invention just provides a kind of oil well high water-bearing layer pressure blocking method, to solve the problem of further taping the latent power that prior art that prior art exists can't realize remaining oil.
Technical scheme of the present invention is: a kind of oil well high water-bearing layer pressure blocking method is characterized in that: may further comprise the steps:
(1), is lowered to the shutoff tubing string: the shutoff tubing string is lowered in the selected oil reservoir; Expansion loop and ball seat are housed respectively in the top of this shutoff tubing string and the lower end, this ball seat and the spheroid above it constitute valve, upper packer, constant pressure valve and lower packet are housed between described expansion loop and ball seat successively, and this upper packer and lower packet are corresponding to the upper and lower side of oil well effective operation aspect;
(2), inject blocking agent: the little swollen high-strength blocking agent that adopts pump truck to prepare is just being annotated in the described oil reservoir;
(3), clear water is for squeezing: after having annotated sealing agent, according to tubing string internal volume equivalent injection clear water, with whole sealing agent slug formula squeeze notes in target zone;
(4), wait with fixed attention: wait sealing agent and solidified 40～60 hours;
(5), implement fracturing work.
Described little swollen high-strength blocking agent comprises: select for use the modified high-molecular acrylamide to be configured to the aqueous solution of 13-15% concentration, under normal temperature condition, add setting accelerator NN methylene acrylamide 0.03-0.08%, add crosslinking agent ammonium persulfate 0.008-0.12% again, stand-by after mixing.Because geological conditions and hole condition is different, want the temperature, pressure adjustment setting accelerator under the base area and the additional proportion of crosslinking agent when specifically implementing.
The product type of described little swollen high-strength blocking agent is TP-2.
The process for preparation of described little swollen high-strength blocking agent comprises: with sealing agent car and water-tank lorry each component is joined in the Agitation Tank, pump in the fluid reservoir standbyly again with circulation pump, with described pump truck blocking agent is pressed in the described shutoff tubing string when implement injecting the blocking agent step.
The invention has the beneficial effects as follows: with the modified high-molecular acrylamide is host, under effects such as crosslinking agent, setting accelerator, crosslinked under the stratum, form little varicosity type structure, can carry out effective shutoff to man-made fracture in the high aquifer of original oil well and intrinsic fracture, because breakthrough pressure can produce new man-made fracture at the subsequent implementation fracturing work greater than the fracture pressure on stratum.Can make inflow direction on the position, high aquifer of original oil well by shutoff, and produce the man-made fracture in new orientation, just can link up the part remaining oil, improve the recovery percent of reserves of oil well, enlarge swept volume, incremental oil production improves recovery ratio.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is the end face structure schematic diagram that shutoff tubing string of the present invention is lowered to oil reservoir;
Fig. 3 be blocking agent of the present invention sticking～time characteristic curve;
Fig. 4 is the artificial core electron-microscope scanning picture that adopts blocking agent of the present invention;
Fig. 5 is with the different salinity apparent viscosity of blocking agent of the present invention influence curve;
Fig. 6 is a invention process in towards 61-Y127 well shutoff crack and fracturing fracture surveillance map.
The specific embodiment
Referring to Fig. 1 and Fig. 2, a kind of oil well high water-bearing layer pressure blocking method of the present invention comprises following processing step:
(1), be lowered to the shutoff tubing string: adopt the conventional method well-digging to be lowered to sleeve pipe 12, and with shutoff tubing string 6 from being lowered to oil reservoir 14 in the sleeve pipe 12.Expansion loop 7 and valve ball seat 11 are housed respectively in the top of this shutoff tubing string 6 and the lower end, upper packer 8, constant pressure valve 9 and lower packet 10 are housed between described expansion loop 7 and ball seat 11 successively, and this upper packer 8 and lower packet 10 are corresponding to the upper and lower side of oil well effective operation aspect (oil reservoir) 14.Expansion loop 7, packer 8, constant pressure valve 9, lower packet 10 and ball seat 11 are conventional structure.
The function of expansion loop 7 is protection upper packers, alleviates the pressure that promotes the shutoff tubing string.Last lower packet 8 and 10 be upper and lower side in oil well effective operation aspect 14 with the ring-like space packing between tubing and casing, oil pipe 6 is communicated with the sealing of effective operation layer.Constant pressure valve 9 one is the release that guarantees packer, the 2nd, sealing agent is injected into effective layer 14.Ball seat 11 is to occur in the construction when unexpected as the circulation canal of de-plugging, is used for the shutoff liquid in pipe, improves the pipe internal pressure.
(2), inject blocking agent: the little swollen high-strength blocking agent that adopts pump truck to prepare is just being annotated in the selected oil reservoir 14.
(3), clear water is for squeezing: after having annotated sealing agent, according to tubing string internal volume equivalent injection clear water, with whole sealing agent slug formula squeeze notes in target zone." slug formula " is the industrial term in oil field, when referring to the displacement of liquid-liquid, and after sealing agent has injected, the polyacrylamide solution of 1% concentration of reinjecting (the about 5-10 cubic meter of practical application), clear water reinjects.The effect of slug is exactly to isolate clear water and sealing agent, prevents that medicament is diluted.
(4), wait with fixed attention: wait sealing agent and solidified 40～60 hours.
(5), implement fracturing work.Fracturing work is a routine work in oil field, and group finishes by pressure break.
The little swollen high-strength blocking agent of described TP-2 type comprises: the modified high-molecular acrylamide is configured to the aqueous solution of 13-15% concentration, under normal temperature condition, add setting accelerator NN methylene acrylamide 0.03-0.08%, add crosslinking agent ammonium persulfate 0.008-0.12% again, stand-by after mixing.Because geological conditions and hole condition is different, want the temperature, pressure adjustment setting accelerator under the base area and the additional proportion of crosslinking agent when specifically implementing.
The process for preparation of described little swollen high-strength blocking agent comprises: with sealing agent car and water-tank lorry each component is joined in the Agitation Tank, pump in the fluid reservoir standbyly again with circulation pump, with described pump truck blocking agent is pressed in the described shutoff tubing string when implement injecting the blocking agent step.
The present invention is further described below in conjunction with Fig. 3～Fig. 6.
(1), the little swollen high-strength blocking agent of TP-2:
By the laboratory test of multiple formulations, selecting the modified high-molecular acrylamide for use is host, crosslinked under the stratum under effects such as crosslinking agent, setting accelerator, forms little varicosity type structure, effectively the high moisture fluid producing layer of shutoff.
1, the component of modified high-molecular acrylamide, crosslinking agent, setting accelerator and collocation method: this sealing agent is selected the soup of modified high-molecular acrylamide configuration 13-15% concentration for use, under normal temperature condition, adding setting accelerator---NN methylene acrylamide 0.03-0.08% adds crosslinking agent again---ammonium persulfate 0.008-0.12%.It is stand-by to mix the back.
Because geological conditions and hole condition is different, want the temperature, pressure adjustment setting accelerator under the base area and the additional proportion of crosslinking agent when specifically implementing.
2, the performance and the scope of application:
Ground viscosity :≤1.04mPaS
Become adhesiveness: 30-200PaS
But the pump time: 1-15h
Compressive resistance: 15MPa
Be applicable to 30 ℃ of-90 ℃ of oil reservoir injection well profile controls and oilwell water shutoffs.
3, profile control mechanism:
Body series is a host with the modified high-molecular acrylamide mainly, under effects such as crosslinking agent, setting accelerator, crosslinked under the stratum, form little varicosity type structure, the high water accepting layer of shutoff, effectively solve inject water along the crack, the macropore channelling advances by leaps and bounds, causes injecting ripples and problems such as coefficient is low, oil displacement efficiency difference.Adjust and improve intake profile by the method for shutoff high permeability zone macropore, waterline is advanced more uniformly, prevent the too early water logging of oil well, reduce well water, increase that to sweep pasta long-pending, reduce the region of bypassed oil.Therefore, it can be widely used in the profile control and water plugging of various formation conditions, changes the liquid flow path direction of oil deposit deep part, enlarges swept volume, and incremental oil production improves recovery ratio.
4, reaction skeleton symbol
(2) site operation and data determination:
1, select the well overview:
Basic condition statistical form table 1 before the test well measure
2, gelation time and gelling strength are measured:
Referring to Fig. 3, sealing agent base fluid apparent viscosity 46.9mPas, gelation time 11.5h; And gel-forming property is better, and the sealing agent apparent viscosity tends towards stability behind the 30h, and gelling strength reaches 480 * 10
4MPas.
(2) agglutination attitude is measured:
In the indoor application Electronic Speculum, the shutoff situation of artificial core is observed.Can find out obviously that from the result all holes are almost attached, stop up by sealing agent, and when amplifying 1500 times, not see yet and do not stop up pore throat, sealing agent almost " parcel " whole medium cross section, prove that sealing agent has good property annotated and gel-formation power.See also Fig. 4.
Sealing ratiod 99.5% when experiment records 1PV, 30PV wash away back sealing ratiod 98.3%, show that sealing agent has abrasion resistance energy preferably, and the laboratory core experiment records breakthrough pressure greater than 45MPa.Referring to table 2.
Table 2, blocking agent performance indications table
3, compatibility test:
For the compatibility of checking sealing agent, carried out the compatibility test with different salinity different water type.Experimental result shows, compares with the experiment tap water, and when utilizing simulation oil field recovered water preparation sealing agent, the one-tenth adhesiveness of sealing agent is more or less the same, and just gelation time has prolonged 5～10h.Referring to different salinity apparent viscosity influence curves shown in Figure 1.
The result shows: blocking agent initial viscosity 46.9mPas, and gelation time 11.5h, gelling strength is greater than 480 * 10
4MPas, core experiment show its breakthrough pressure greater than 45MPa, and sealing ratiod can reach 99.5%, have good abrasion resistance energy simultaneously, and sealing agent is functional, can satisfy the requirement of site operation.4, site operation: referring to above-mentioned explanation in conjunction with Fig. 1 and Fig. 3.
The shutoff tubing string adopts expansion loop+K3441-114 packer+constant pressure valve+K341-114 packer+ball seat.Be lowered to the shutoff tubing string during construction earlier, after the injection blocking agent, for clear water wait coagulate 48h, then implement pressure break at 1: 1.
(3) test well is chosen:
When selecting well, at first want block stratum, confirmed test well place two less and the test well recovery percent of reserves is low to the geostatic stress difference, next uses production profile data and Detailed Geologic Research Results, selects to have certain thickness layer position and blocks up pressure.
Since 2005, carried out field trial having chosen 16 mouthfuls of wells towards 50 blocks such as grade.
(4) field trial effect:
1, Crack Monitoring and fracture pressure show shutoff old seam produced new seam:
In order to separate the variation in shutoff and fracturing fracture orientation, 16 mouthfuls of test wells have all been carried out the microseism monitoring.By contrast, the fracturing fracture azimuth averaging departs from 21.5 ° in former crack (shutoff crack), and the first pressure break of fracture pressure improves 9.4MPa, illustrates to have produced new man-made fracture.
Table 2, high water-bearing layer pressure blocking well Crack Monitoring outcome table
As the C61-Y127 well: monitoring former artificial crack during shutoff is NW64.1 °, consistent with water injection well well location orientation, analyzes to be the water breakthrough crack, and pressure break has produced NE73.7 ° crack, illustrates that former water breakthrough crack is by shutoff.New crack is compared with former crack, differs 42.2 °.The fracture pressure contrast of on-the-spot pressure break, this pressure break illustrates that than pressure break fracture pressure raising last time 8.7MPa the moisture old seam of former height obtains effective shutoff, has produced new seam.
Towards 61-Y127 well shutoff crack and fracturing fracture surveillance map, wherein abscissa and ordinate are represented the orientation respectively referring to shown in Figure 2, untouched distributions that chink of last figure expression, and figure below is represented new fracturing fracture distribution.
2, oil increasing effect:
Test 16 mouthfuls of wells at present altogether, average individual well of the measure initial stage liquid 7.1t that increases day by day, the oily 4.1t that increases day by day, moisture decline 33.8%, statistics is implemented 12 mouthfuls of wells early at present, the average individual well liquid 3.7t that increases day by day, the oily 1.4t that increases day by day, moisture decline 16.2%, accumulative total increases oily 8246.0t.
Table 3, stifled kill-job statistical effect table
High water-cut well is seen better effect of increasing production by implementing the stifled combined process technology of pressing, and has improved recovery percent of reserves.Statistics is implemented 12 mouthfuls of wells early, and recovery percent of reserves improves 1.3 percentage points.Wherein 7 mouthfuls of well recoverys percent of reserves implementing in 2005 improve 1.58 percentage points.
Table 4, test well measure effect contrast table
3, the effectively well analysis of causes:
(1) unidirectional, diconnected well effect is better, 4 mouthfuls of wells of the relatively poor unilaterally connected of three-dimensional connected well effect, average individual well of initial stage oily 5.0t that increases day by day, moisture decline 35.8%, the oily 1.0t that increases day by day at present, moisture decline 13.5%, individual well accumulative total increases oily 752.6t; 5 mouthfuls of wells of diconnected, average individual well of initial stage oily 3.3t that increases day by day, moisture decline 26.4%, the oily 2.3t that increases day by day at present, moisture decline 29.7%, individual well accumulative total increases oily 869.1t; Three-dimensional is communicated with 2 mouthfuls of wells, average individual well of the initial stage oily 4.4t that increases day by day, and moisture decline 22.0%, the individual well oily 1.2t that increases day by day at present, moisture decline 7.4%, individual well accumulative total increases oily 445.0t.
Table 5, the stifled statistical effect table of pressing of different connection situation well
The unilaterally connected well presses back initial stage liquid, oil all to rise to some extent, and it is abundant to reflect that regional remaining oil is linked up in new crack, but because connected well is less, follow-up energy shortage, liquid, oil all descend comparatively fast after a period of time.The diconnected well presses back initial stage liquid, oil all to rise to some extent, and the output fall is less after a period of time, reflects new crack communication region energy abundance, and produce oil is better.The three-dimensional connected well presses the back liquid measure to rise, and moisture higher, produce oil rises, and reflects that new crack communication regional connectivity well number is more, and remaining oil distribution is less.
As towards 67-Y123 well unilaterally connected, monitoring former artificial crack during shutoff is NE77.2 °, has produced another orientation after the pressure break and be NW82.5 ° new seam, and the crack turns to 20 °.The measure initial stage liquid 16.4t that increases day by day, the oily 4.5t that increases day by day, the oily 2.1t that increases day by day at present, accumulative total increases oily 1545.1t, and effect is better.
As towards 76-118 well diconnected, monitoring former artificial crack during shutoff has two, and one is NE45 °, and another is NW13 °, and is consistent with two mouthfuls of water injection well well location orientation, analyze to be the water breakthrough crack, and former artificial crack is positioned at high water zone; And on NE67 ° and NW41 ° of two orientation, having produced new seam during pressure break, the crack turns to 22 ° and 28 ° respectively.The measure initial stage liquid 8.3t that increases day by day, the oily 4.3t that increases day by day, the oily 2.5t that increases day by day at present, accumulative total increases oily 2439.7t.Former northwest (NW) water breakthrough crack is described by shutoff, new crack is compared with former crack, and new seam has been linked up low water zone, and effect is better.
Be communicated with towards 102-68 well three-dimensional, monitoring former artificial crack during shutoff is NE76.7 °, has produced another orientation after the pressure break and be NW82.4 ° new seam, and the crack turns to 5.7 °.New as can be seen seam all is in moisture higher zone with old seam from remaining oil distribution figure, the initial stage oily 1.0t that increases day by day, and the oily 0.7t that increases day by day at present totally increases oily 332.3t, and effect is relatively poor relatively.
(2) effect of shorter well initial stage is better time high yield water phase:
3 years time high yield water phase to be going into the well 7 mouthfuls, average individual well of the initial stage liquid 8.8t that increases day by day, and the oily 5.1t that increases day by day, moisture decline 38.7%, the liquid 3.6t that increases day by day at present, the oily 1.8t that increases day by day, moisture decline 24.9%, individual well accumulative total increases oily 942.9t.Time high yield water phase is 4 mouthfuls of wells more than 3 years, average individual well of the initial stage liquid 8.0t that increases day by day, and the oily 2.3t that increases day by day, moisture decline 13.5%, the liquid 3.4t that increases day by day at present, the oily 1.2t that increases day by day, moisture decline 10.3%, average individual well accumulative total increases oily 411.5t.
Table 6, the stifled statistical effect table of pressing of different high yield water time well
For example towards 1 year 65-143 well high yield water time, the pressure break initial stage promptly showed oil increasing effect preferably, totally increased oily 811.8t up to now.Towards 6 years 102-68 well high yield water time, moisture higher always after the pressure break, accumulative total increased oily 332.3t.
(3) combine with the profile control measure and can obtain effect preferably:
Towards the 60-128 well location in a class towards 50 blocks, this well is communicated with 2 mouthfuls of wells.The 7 years high yield water time of in April, 2005, production fluid 4.4t, moisture 100%, see that from the oil-water well dynamic reflection main water bearing bed position is FI32, FI51, and main inflow direction is towards 60-130.In May, 2005, stifled the pressure constructed, shutoff FI32, FI51 layer, and former crack orientation NE77.9 °, newly stitch NW82.1 °, turn to 20 °, but new seam still is positioned at high water zone.6 months moisture in December, 100%, 2005 is to carrying out chemical shallow profile control, pressure rising 1.8MPa behind the profile control after the measure towards 60-130, intake profile reflects that each layer suction situation is effectively improved, moisture on a declining curve, produce oil rises, and adds up to increase oil at present and reaches 616.7t.
(4) the well measure effect that steering angle is little is relatively poor relatively:
The little 2 mouthfuls of wells of steering angle (less than 10 °), average individual well of the initial stage liquid 1.0t that increases day by day, the oily 0.9t that increases day by day, moisture decline 10.7%, the liquid 0.2t that increases day by day at present, the oily 1.3t that increases day by day, moisture decline 16.8%, individual well accumulative total increases oily 235.8t.The big 9 mouthfuls of wells of steering angle, average individual well of the initial stage liquid 10.1t that increases day by day, the oily 4.8t that increases day by day, moisture decline 29.6%, the liquid 4.2t that increases day by day at present, the oily 1.6t that increases day by day, moisture decline 17.4%, individual well accumulative total increases oily 863.8t.
Table 7, the stifled statistical effect table of pressing of different steering angle
Towards the 87-125 well is infill well towards the 1-55 block, went into operation in 2002, initial stage production fluid 1.5t, produce oil 1.5t, 2003 moisture rises to 74.8%, measure preceding moisture 89%, carry out the shutoff construction in July, 2006, shutoff FII1 layer, NE65.4 ° of shutoff directional surveillance, NE69.6 ° of pressing crack construction directional surveillance, crack turn to 4.2 °.Day at measure initial stage production fluid 5.6t, produce oil 1.2t, moisture 78.6%, the reason of analytical effect difference is the close tomography of this well, owing to can cause stress abnormality near the tomography, the crack turns to and is restricted, new seam only departs from 4.2 ° with old seam, does not break through the high water aquifer of former seam, and effect is relatively poor.
4, the invalid well analysis of causes:
Encrypt wellblock high water-cut well production capacity for improving, reduce and encrypt the high watered-out well ratio in wellblock, carrying out the crack steering test of high watered-out well towards the 103-13 well.
Towards the 103-13 well is the infill well of preparation wellblock, and go into operation in January, 2002, initial stage production fluid 6.8t, moisture 100%.Shutoff FI7
1～FII1 layer, microseism monitoring show that new seam departs from 55.8 ° of former seams, but open take out after 5 months till now moisture still 100%.
In conjunction with being communicated with well water injection pressure and the moisture situation of change of closing on the conditional likelihood oil well, think, twice pressure break before and after the measure of C103-13 well, the crack is all linked up with tomography, be communicated with well C104-12 man-made fracture and also link up, cause C103-13 well water to flood with tomography.
(5) Economic and Efficiency Analysis:
Test 16 mouthfuls of wells at present altogether, statistics is implemented 12 mouthfuls of wells early, adds up to increase oily 8246.0t by the end of the end of the year, and average individual well increases oily 687.2t.
Average individual well shutoff expense: 20.33 ten thousand yuan;
Average individual well pressure break expense: 17.2 ten thousand yuan;
12 mouthfuls of wells add up to expense: 450.36 ten thousand yuan;
Increase oily benefit: 8246 * (2382-647)=1430.68 ten thousand yuan;
Input-output ratio: 1: 3.2;
Input-output ratio can reach more than 1: 4.3 in estimating effectively.
(6) technology assessment:
1. it is moisture that this technology can play the reduction high water-cut well, realizes the purpose that high aquifer remaining oil is taped the latent power.The oily 687.2t of average individual well accumulation increasing after the measure, the stage recovery percent of reserves improves 1.3 percentage points.
2. on the basis of fine geology research, in conjunction with remaining oil distribution, selectively stress difference little, with well be short high water-cut well of unilaterally connected or diconnected, high moisture time as the service shaft layer, improved effective well ratio and obtained higher effect of increasing production.
3. combine with the profile control measure and can obtain effect preferably.
4. present shutoff tubing string effective interval of shutoff once, parameters such as the consumption of blocking agent will rely on the climbing pressure of bed thickness, site operation to determine.
Claims (4)
1. oil well high water-bearing layer pressure blocking method is characterized in that: may further comprise the steps:
(1), is lowered to the shutoff tubing string: the shutoff tubing string is lowered in the oil reservoir; Expansion loop and ball seat are housed respectively in the top of this shutoff tubing string and the lower end, this ball seat and the spheroid above it constitute valve, upper packer, constant pressure valve and lower packet are housed between described expansion loop and ball seat successively, and this upper packer and lower packet are corresponding to the upper and lower side of oil well effective operation aspect;
(2), inject blocking agent: the little swollen high-strength blocking agent that adopts pump truck to prepare is just being annotated in the described oil reservoir;
(3), clear water is for squeezing: after having annotated sealing agent, according to tubing string internal volume equivalent injection clear water, with whole sealing agent slug formula squeeze notes in target zone;
(4), wait with fixed attention: wait sealing agent and solidified 40～60 hours;
(5), implement fracturing work.
2. oil well high water-bearing layer pressure blocking method according to claim 1, it is characterized in that: described little swollen high-strength blocking agent comprises: select for use the modified high-molecular acrylamide to be configured to the aqueous solution of 13-15% concentration, under normal temperature condition, add setting accelerator NN methylene acrylamide 0.03-0.08%, add crosslinking agent ammonium persulfate 0.008-0.12% again, stand-by after mixing.
3. oil well high water-bearing layer pressure blocking method according to claim 2 is characterized in that: the product type of described little swollen high-strength blocking agent is TP-2.
4. oil well high water-bearing layer pressure blocking method according to claim 1 is characterized in that: the process for preparation of described little swollen high-strength blocking agent comprises:
With sealing agent car and water-tank lorry each component is joined in the Agitation Tank, pump in the fluid reservoir standbyly again with circulation pump, with described pump truck blocking agent is pressed in the described shutoff tubing string when implement injecting the blocking agent step.
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2007
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| CN101787864A (en) * | 2010-03-15 | 2010-07-28 | 中国石油集团川庆钻探工程有限公司 | Method for plugging water from oil reservoir fractured water logging oil well developed by injecting water into low-permeable reservoir stratum |
| CN101787864B (en) * | 2010-03-15 | 2013-10-30 | 中国石油集团川庆钻探工程有限公司 | Method for plugging water from oil reservoir fractured water logging oil well developed by injecting water into low-permeable reservoir stratum |
| CN102102499A (en) * | 2011-01-26 | 2011-06-22 | 河南理工大学 | Plugging equipment for ground fracturing plugging water-bearing stratum |
| CN102102499B (en) * | 2011-01-26 | 2013-04-17 | 河南理工大学 | Plugging equipment for ground fracturing plugging water-bearing stratum |
| CN103562339A (en) * | 2011-05-10 | 2014-02-05 | 陶氏环球技术有限责任公司 | Curable composition for use as lost circulation material |
| CN102767353B (en) * | 2012-07-26 | 2015-03-11 | 新疆华油技术服务股份有限公司 | Comprehensive mining technology of drowned well |
| CN102767353A (en) * | 2012-07-26 | 2012-11-07 | 新疆华油技术服务股份有限公司 | Comprehensive mining technology of drowned well |
| CN102926701B (en) * | 2012-10-31 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司 | A kind of mixed matching water-plugging technology method continuously |
| CN102926701A (en) * | 2012-10-31 | 2013-02-13 | 中国石油集团川庆钻探工程有限公司 | Continuous mixing type water plugging technique |
| CN104632123B (en) * | 2013-11-15 | 2017-08-04 | 中国石油天然气股份有限公司 | A kind of ultralow kill-job blocking method |
| CN104632123A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Ultralow-pressure well leakage plugging method |
| CN104196487A (en) * | 2014-08-01 | 2014-12-10 | 中国石油大学(北京) | Experimental method for evaluating adaptability of plugging agent in low permeability crack rock core |
| CN105781533A (en) * | 2014-12-22 | 2016-07-20 | 中国石油天然气股份有限公司 | Ground surface blowing and spraying treatment method |
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| CN104449622B (en) * | 2014-12-22 | 2018-05-01 | 陈国伟 | High temperature resistance high pressure organic composite type Oil layer protective solution and preparation method thereof |
| CN105178910A (en) * | 2015-09-11 | 2015-12-23 | 中国石油天然气股份有限公司 | Water-plugging process tubing string and method of horizontal wells |
| CN108533241A (en) * | 2018-02-07 | 2018-09-14 | 中石油煤层气有限责任公司 | A kind of CBM Fracturing method |
| CN108979610A (en) * | 2018-08-07 | 2018-12-11 | 中国石油天然气股份有限公司 | Horizontal well stitches interior fluid diversion control water blocking water development approach, apparatus and system |
| CN110564393A (en) * | 2019-08-08 | 2019-12-13 | 大庆油田有限责任公司 | Micro-expansion type plugging agent and preparation method thereof |
| CN110564393B (en) * | 2019-08-08 | 2022-06-10 | 大庆油田有限责任公司 | Micro-expansion type plugging agent and preparation method thereof |
| CN112267863A (en) * | 2020-09-21 | 2021-01-26 | 中石油煤层气有限责任公司 | Temporary plugging and re-fracturing method for coal-bed gas well cracks |
| CN113153215A (en) * | 2021-04-23 | 2021-07-23 | 大庆辰平钻井技术服务有限公司 | Chemical plugging method for high-water flooded layer of deflecting section of ultra-short radius horizontal well |
| CN113153215B (en) * | 2021-04-23 | 2022-11-29 | 大庆辰平钻井技术服务有限公司 | Chemical plugging method for high-water-flooded layer of deflecting section of ultra-short radius horizontal well |
| CN114790882A (en) * | 2022-04-29 | 2022-07-26 | 中国石油大学(北京) | Repeated fracturing production method |
| CN114790882B (en) * | 2022-04-29 | 2023-09-08 | 中国石油大学(北京) | Repeated fracturing production method |
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Application publication date: 20080409 |