CN103113871A - Selecting and blocking ball for performing profile control of water injection well in medium-high temperature oilfield and preparation method and application thereof - Google Patents
Selecting and blocking ball for performing profile control of water injection well in medium-high temperature oilfield and preparation method and application thereof Download PDFInfo
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- CN103113871A CN103113871A CN2013100345765A CN201310034576A CN103113871A CN 103113871 A CN103113871 A CN 103113871A CN 2013100345765 A CN2013100345765 A CN 2013100345765A CN 201310034576 A CN201310034576 A CN 201310034576A CN 103113871 A CN103113871 A CN 103113871A
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Abstract
The invention provides a selecting and blocking ball for performing profile control of a water injection well in a medium-high temperature oilfield and a preparation method and application thereof. The selecting and blocking ball is manufactured by a mixture of polyvinyl chloride and high-density polyethylene. The preparation method comprises the steps of heating polyvinyl chloride and high-density polyethylene in a mixing mode to form a melt, or heating polyvinyl chloride and high-density polyethylene to be the melt and mixing; and manufacturing solid-state selecting and blocking ball products with different diameters. The selecting and blocking ball can be applied to blocking of shot holes in fractionized water injection sections of the water injection well in the oilfield, so that the water injection effect can be improved to increase the yield of crude oil exploitation and oil extraction efficiency.
Description
Technical field
The present invention relates to a kind of middle high temperature oil field Profile Control in Injection Well with selective plugging ball and preparation method thereof and application, thereby specifically throw accent stifled ball, its preparation method that profile control ball shutoff borehole uses in a kind of middle high temperature oil field water injection well subdivision injection interval and utilize this selective plugging ball to improve the method for Oil extraction output and oil-production efficiency to improve flood effectiveness.
Background technology
Ball injection profile control technique is mainly used in the inspissated pool thermal recovery well, can't cause interlayer to inhale the problem of vapour inequality by layer steam injection to solve because cover becomes.Prior art (the Cheng Xin that " utilizes pitching to select the notes technology to prevent that viscous crude steam vapour from altering ", " Inner Mongol chemical industry ", the 23rd phase P98-99 in 2009) according to heat notes operating mode and Sealing Conditions, the selective plugging ball is proposed following processing requirement: 1. selective plugging ball relative density is: 0.9～1, and can be floating mobile in fluid to guarantee the selective plugging ball; 2. high temperature resistant 320 ℃ of selective plugging ball, withstand voltage 17MPa; 3. the selective plugging ball can have good physical strength and certain elasticity under High Temperature High Pressure, and on the one hand, under high-temperature and high-pressure conditions, stifled ball can not affect plugging effect because of breakage; On the other hand, under high-temperature and high-pressure conditions, stifled ball must have certain elasticity (under 320 ℃, 17MPa pressure, the borehole of shutoff 12mm left and right, the spheroid insert depth is in the 3mm left and right), namely can not follow the string affects the effect of shutoff borehole, more can not because of the selective plugging ball too soft borehole that is squeezed into that becomes, stop up oil reservoir.4. the diameter of stifled ball is 22mm.During steam injection, Metal Ball stops steam to enter with the direct shutoff high permeability formation of steam flow borehole, completes profile control in pit shaft.
In recent years, above-mentionedly utilize pitching to select the notes technology also to be useful on water injection well shutoff high permeability formation borehole, thereby the shutoff waterflood path is annotated well but be only limited to system, and be the interior shutoff of pit shaft.See " Studies on Technology of Water Injectivity " (Sun Tongwen etc. for details, " oilfield chemistry ", 1 phase P20-22 in 2003), wherein at the large interval of water injection well water regain, synchronize with injected water flow, slightly larger in diameter is in the direct homogeneous rigidity plastics of borehole ball, leaning on the tangible borehole of pressing under the difference between reservoir pre ssure and injection pressure effect, borehole is blocked, injected water is flowed to and enter other intervals.In addition, and prior art document " theoretical and experimental study of water injection well ball injection profile control technique " (Sun Tongwen etc., " oilfield chemistry ", 2003Vol.20No.2P.113-118); " the ball injection profile control technology is in the application of waterflooding reservoir " (Xue Lei, " Inner Mongol petrochemical complex ", the 10th phase P142 in 2010); " ball injection profile control is adjusted reservoir water section technology " (Shao Chen, Wang Huaiming, " Worker's Univ. Shengli Oil Field's journal " Vol.23No.1P44-45) also is studied report to the technology of same principle.CN2597662Y discloses a kind of composite unidirection ball injection stop, formed by oil pipe and tubing string, tubing pup joint, unidirectional resistive device, righting stopper, after ball injection profile control or pitching stifled acidifying temporarily, the forward and reverse well-flushing of energy, near profile control ball certain area oil reservoir does not flow away with current, has strengthened the permanent stability of profile control effect.
Yet, in practical application, because there are the problems such as substratum is many, interlayer is thin in the water filling block that has, cause thinner that water injection string can't divide, just still there is the inhomogeneous problem of interlayer suction in this in the little interval that causes dispensing, and the interval of dispensing due to reasons such as Water-filling nozzle throttlings, has been not easy to take chemical profile control technique, more can't implement the ball injection profile control in layering well section.
Summary of the invention
Main purpose of the present invention is to provide a kind of Profile Control in Injection Well selective plugging ball, specifically a kind ofly be applicable to throw in middle high temperature oil field subdivision injection interval the stifled ball of accent that profile control ball shutoff borehole is used, with the raising flood effectiveness, thereby improve Oil extraction output and oil-production efficiency.
Another object of the present invention is to provide the preparation method of described Profile Control in Injection Well with the selective plugging ball.
Another object of the present invention is to provide the application of described Profile Control in Injection Well with the selective plugging ball, specifically its application in middle high temperature oil field Profile Control in Injection Well process.
On the one hand, the invention provides a kind of middle high temperature oil field Profile Control in Injection Well selective plugging ball, it is to be made by the mixture of polyvinyl chloride and high density polyethylene.
Be the rigidity plastics ball than traditional selective plugging ball, the present invention has thoroughly changed the material of selective plugging ball, adopts the mixture of polyvinyl chloride and high density polyethylene to prepare the selective plugging ball.
A kind of little white transparent solid under polyvinyl chloride normal temperature, 80～85 ℃ of its softening temperatures, proportion 1.35～1.45g/cm
3The proportion of high density polyethylene is 0.94～0.96g/cm
3, 105～120 ℃ of softening temperatures.
For the polyvinyl chloride of every batch and high density polyethylene, must accurately measure its density.
According to specific embodiments of the present invention, be that to make the density of selective plugging ball be 1.01 ± 0.01g/cm for the blending ratio of adjusting polyvinyl chloride and high density polyethylene
3
According to specific embodiments of the present invention, the blending ratio of described polyvinyl chloride and high density polyethylene is generally: the polyvinyl chloride blend range is approximately 10.2%～17.1%, and the high density polyethylene blend range is approximately 82.9%～89.8%.
According to specific embodiments of the present invention, Profile Control in Injection Well of the present invention with the selective plugging ball be polyvinyl chloride is become with the high density polyethylene Hybrid Heating melts or with polyvinyl chloride with mix after high density polyethylene is heated into melts, make the solid-state selective plugging ball product of different diameter with injection moulding machine.
The present invention with transferring in the past another difference of stifled ball was: changing the outer shutoff of borehole is shutoff in borehole, and according to specific embodiments of the present invention, Profile Control in Injection Well of the present invention selective plugging ball, its diameter are 70～90% of purpose oil-layer blasthole diameter.The selective plugging ball is slightly less than borehole, can enter to carry out profile control in borehole.And Profile Control in Injection Well of the present invention is greatly improved with the high temperature resistant property of selective plugging ball, can bring up to 80 ℃ from 35 ℃, satisfy general oil field particularly in the requirement of high temperature oil field (60～80 ℃) water injection well.
On the other hand, the present invention also provides the preparation method of described Profile Control in Injection Well with the selective plugging ball, and the method comprises:
Polyvinyl chloride is become melts with the high density polyethylene Hybrid Heating, perhaps with polyvinyl chloride with mix after high density polyethylene is heated into melts, then the polyvinyl chloride of melting and the mixture of high density polyethylene are obtained the solid-state selective plugging ball product of different diameter by injection moulding machine.
On the other hand, the present invention also provides the application of described Profile Control in Injection Well with the selective plugging ball, specifically its application in the water injection well in oil fields profile control, and more specifically described selective plugging ball is used for ball-off borehole in high temperature oil field water injection well subdivision injection interval.
When utilizing selective plugging ball of the present invention to carry out the water injection well in oil fields profile control, can utilize existing pitching device that selective plugging ball pushing belt is entered well, enter oil reservoir by borehole.For example, specifically can carry out according to following operation:
1, according to geologic requirements, water injection well is divided into several intervals according to formation condition, then selects the interval of needs dispensing ball injection profile control selective plugging ball profile control according to the formation condition of the substratum in each interval;
2, select the dispensing ball injection profile control selective plugging ball of respective numbers according to the substratum geologic condition in need ball injection profile control interval, blasthole number and borehole aperture, the quantity of ball guarantees to be as the criterion needing the shutoff borehole to block;
3, with dispensing ball injection profile control selective plugging ball within the Sheng cage of ball injection profile control water injection allocator is packed on ground into, and baffle plate is installed;
4, successively tubing string is connected by the dispensing requirement, lower after the planned well section completion;
5, after the release profile control ball, normal water filling can reach requirement.
In sum, provide and thrown the stifled ball of accent that profile control ball shutoff borehole is used in a kind of subdivision injection interval, be applied to the interior ball injection profile control of pit shaft of separate injection interval in high temperature oil field water filling later stage separate injection well, the shutoff of realization to water stream channel, with plane and the interlayer contradiction of improving the separate injection interval oil reservoir, make the intake profile of water injection well become more balanced, enlarge the water drive swept volume, thereby can improve flood effectiveness, improve Oil extraction output and oil-production efficiency, lay the foundation for realizing water injection well in oil fields subdivision injection ball injection profile control integral process.The present invention has following beneficial effect:
1, with low cost, Meteorological is low, compares with existing subdivision injection technique, has just increased the expense of dispensing ball injection profile control ball, reduces great amount of cost than the chemical profile control technology;
2, use safety, environmental protection, compare environmental protection more, safety than chemical profile control technique;
3, profile control ball used is slightly less than borehole, can enter to carry out profile control in borehole;
If 4 actual plugging strengths are higher, cause water injection pressure too high, do not meet field requirement, can adopt the method for heating with dispensing ball injection profile control selective plugging ball fusing de-plugging, that is, profile control ball used can block up and can separate.
5, technique is simple, only uses tubing string to connect and both can complete, and is simple, convenient.
6, can satisfy most of water injection well in oil fields to the requirement of temperature.
Embodiment
Understand for technical characterictic of the present invention, purpose and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as restriction to practical range of the present invention.
Embodiment 1
It is 1.01g/cm that the polyvinyl chloride 17.1% of proportion 1.35 is become proportion with proportion 0.94 high density polyethylene 82.9% Hybrid Heating
3Melts, make the bead of diameter 7cm with injection moulding machine, (this finished diameter be about purpose oil-layer blasthole diameter 9cm 78%) gets product.
When utilizing selective plugging ball of the present invention to carry out the water injection well in oil fields profile control, can selective plugging ball pushing belt be entered well by " the water injection well in oil fields subdivision injection ball injection profile control integrated pipe column " of prior art, enter oil reservoir by borehole, concrete operations are as follows:
1, adopt certain well suction situation according to brocade, water injection well is divided into three intervals according to formation condition, place the stifled ball of accent at middle part and bottom interval.
2, according to the substratum geologic condition in need profile control interval, select 400, profile control selective plugging ball.
3, with dispensing ball injection profile control selective plugging ball within the Sheng cage of water injection well subdivision injection ball injection profile control integrated pipe column water injection allocator (prior art) is packed on ground into, and baffle plate is installed.
4, successively tubing string is connected by the dispensing requirement, lower after the planned well section completion.
5, after the release profile control ball, normal water filling.
6, after the construction, water injection pressure rises to 3.35MPa by 2.95MPa.
7, construction is after three months, and corresponding oil well production data are by day production fluid 45.2m
3, day produce oil 0.5t, moisture 98%, be changed to a day production fluid 31.6m
3, day produce oil 1.2t, moisture 96.2%, seen certain oil increasing precipitation effect.
Claims (9)
1. Profile Control in Injection Well selective plugging ball, it is to be made by the mixture of polyvinyl chloride and high density polyethylene.
2. Profile Control in Injection Well according to claim 1 selective plugging ball, wherein, 80～85 ℃ of the softening temperatures of described polyvinyl chloride, proportion 1.35～1.45g/cm
3The proportion of described high density polyethylene is 0.94～0.96g/cm
3, 105～120 ℃ of softening temperatures.
3. Profile Control in Injection Well according to claim 1 selective plugging ball, wherein, it is 1.01 ± 0.01g/cm that the blending ratio of adjusting polyvinyl chloride and high density polyethylene makes the density of selective plugging ball
3
4. according to claim 1 or 3 described Profile Control in Injection Well selective plugging balls, wherein, the blending ratio of described polyvinyl chloride and high density polyethylene is: polyvinyl chloride 10.2%～17.1%, high density polyethylene 82.9%～89.8%.
5. Profile Control in Injection Well according to claim 1 selective plugging ball, this selective plugging ball be polyvinyl chloride is become with the high density polyethylene Hybrid Heating melts or with polyvinyl chloride with mix after high density polyethylene is heated into melts, make solid-state selective plugging ball product with injection moulding machine.
6. Profile Control in Injection Well according to claim 1 selective plugging ball, the diameter of this selective plugging ball is 70%～90% of purpose oil-layer blasthole diameter.
7. one kind prepares the method that the described Profile Control in Injection Well of claim 1～6 any one is used the selective plugging ball, and the method comprises:
Polyvinyl chloride is become melts with the high density polyethylene Hybrid Heating, perhaps with polyvinyl chloride with mix after high density polyethylene is heated into melts, then the polyvinyl chloride of melting and the mixture of high density polyethylene are made solid-state selective plugging ball product with injection moulding machine.
8. the described Profile Control in Injection Well of the claim 1～6 any one application of selective plugging ball in the water injection well in oil fields profile control.
9. application according to claim 8 is wherein that described selective plugging ball is used for ball-off borehole in high temperature oil field water injection well subdivision injection interval.
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| CN201310034576.5A CN103113871B (en) | 2013-01-15 | 2013-01-15 | Middle high temperature oil field Profile Control in Injection Well selective plugging ball and preparation method and application |
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| CN201310034576.5A CN103113871B (en) | 2013-01-15 | 2013-01-15 | Middle high temperature oil field Profile Control in Injection Well selective plugging ball and preparation method and application |
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| CN105370238A (en) * | 2015-11-18 | 2016-03-02 | 中国石油天然气股份有限公司 | Blockage adjusting ball density and diameter selecting method and device |
| CN108329899A (en) * | 2018-02-20 | 2018-07-27 | 盘锦众帮商贸有限公司 | A kind of stifled ball of isodensity tune |
| CN110617041A (en) * | 2019-10-09 | 2019-12-27 | 中国石油天然气股份有限公司 | Water injection well water absorption profile adjusting sleeve and adjusting method |
| CN111827917A (en) * | 2019-04-22 | 2020-10-27 | 中国石油天然气股份有限公司 | Fireflooding gas injection well ball injection profile control process |
| CN112980422A (en) * | 2021-03-31 | 2021-06-18 | 中国石油化工股份有限公司 | Timed gel-breaking carrier fluid composition and using method thereof |
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| CN111827917A (en) * | 2019-04-22 | 2020-10-27 | 中国石油天然气股份有限公司 | Fireflooding gas injection well ball injection profile control process |
| CN110617041A (en) * | 2019-10-09 | 2019-12-27 | 中国石油天然气股份有限公司 | Water injection well water absorption profile adjusting sleeve and adjusting method |
| CN110617041B (en) * | 2019-10-09 | 2022-01-04 | 中国石油天然气股份有限公司 | Water injection well water absorption profile adjusting method |
| CN112980422A (en) * | 2021-03-31 | 2021-06-18 | 中国石油化工股份有限公司 | Timed gel-breaking carrier fluid composition and using method thereof |
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| CN103113871B (en) | 2016-12-28 |
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