CN102953712A - Upper tilting perforation diversion anchored fracturing umbrella ditch gravity oil production method - Google Patents
Upper tilting perforation diversion anchored fracturing umbrella ditch gravity oil production method Download PDFInfo
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- CN102953712A CN102953712A CN2012104371919A CN201210437191A CN102953712A CN 102953712 A CN102953712 A CN 102953712A CN 2012104371919 A CN2012104371919 A CN 2012104371919A CN 201210437191 A CN201210437191 A CN 201210437191A CN 102953712 A CN102953712 A CN 102953712A
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Abstract
The invention discloses an upper tilting perforation diversion anchored fracturing umbrella ditch gravity oil production method, which comprises the following steps that an old oil well (1) of the original depleted oilfield is utilized, and then upper tilting anchored perforations are arranged around the oil well at the lower part of an oil layer (3); and the perforations (2) are segmented at the lower part of the oil layer (3) and are arranged in a spiral shape at an angle of 360 degrees around the oil well (1). A plurality of layers of segmented spiral perforations are arranged at the lower part of the oil layer (3) from top to bottom, and a fracturing technology is carried out to expand the oil leakage porosity, and crude oil flows to the bottom of the oil well through the perforations (2) and cracks by means of gravity. According to the method, the abandoned oil wells are utilized, and then a plurality of segmented upper tilting quadrant perforations are arranged around the oil well at the lower part of the oil layer (3), so that the crack direction is conveniently controlled, and the crack length is increased under the same amount of sand; the perforations (2) are arranged in a spiral shape at an angle of 360 degrees around the oil well (1), the fracturing technology of multi-layer and segment spiral perforations from top to bottom is adopted, the gravity of earth is utilized to drive oil, and the fracturing technology is utilized to expand the oil leakage porosity, so that the oil leaking speed is increased, the oil production area is increased, and the crude oil recovery rate is maximized.
Description
Technical field
The present invention relates to oil well and transform production practice technology, particularly top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method.
Background technology
Along with social high speed development, the energy is constantly nervous, and resource reduces gradually.The oil field development practice of comprehensive various countries, only by once, the overall recovery factor of secondary oil recovery, the highlyest also be no more than 40%.Find is found fewer and feweri, and the old filed of scrapping is more and more, so be badly in need of taking brand-new exploitation method, increases the oil reservoir internal energy, excavate non-homogeneity, hyposmosis, the old wellblock piece of exhaustion and the production capacity of with serious pollution oil reservoir oil reservoir, advance the recovery ratio of a raising crude oil.
On March 18th, 2009, Chinese patent (CN101387195A) discloses a kind of reverse-branch Hole gravity oil drainage extraction technology, this technology adopts makes a call to first a main borehole, then in the reaming of oil reservoir position, beat a plurality of wells around main borehole, a well is dendritic structure upwards, and the crude oil in the well is under action of gravitation, flow to or fall to main borehole, finish compiling of oil stream.This technology utilizes original oil well to carry out the sidetracking tandem, has saved the whole development cost, has at utmost enlarged the oil recovery area, has improved the crude oil reserve development degree.Because this technology, is beaten a well in the reaming of oil reservoir position, just as oil drum keeps flat, it is still inadequate that crude stream goes out power, still restricts the raising of oil recovery factor, and the expense of the sidetracking tandem of digging a well after all in addition also is very high.
Summary of the invention
The objective of the invention is exhausted oil reservoir to be exploited and provide a kind of in order to overcome above-mentioned weak point, increase the top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method of crude oil overall recovery factor and oil production.
The present invention realizes like this, top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method, utilize the old oil well in original exhausted oil field, then around the oil well of oil reservoir bottom, establish several top rade perforations, this perforation the following part well of oil reservoir section around the oil well wall 360 ° in the shape of a spiral shape distribute, employing is multi-section multi-layer spiral perforation from top to bottom in the oil reservoir bottom, and carry out the technology of anchor formula pressure break, enlarge the oil impregnate hole, crude oil under Action of Gravity Field just as oil drum is stood upside down, compile in the oil well bottom by perforation and fracturing fracture, oil well pump is put into the oil well crude oil junction recover the oil.
As a kind of improvement of the present invention, described perforation is distributed in oil reservoir bottom 0.2-30 rice, around oil well, the oil reservoir bottom establishes 2-16 perforated zone.
As another kind of improvement the of the present invention, described perforation top rade is 1 °-45 °.
Top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method of the present invention, utilize discarded old well, then a minute interval carries out several top rade perforations around in the oil reservoir bottom, this perforation is from the 360 ° of in the shape of a spiral shape distributions all around of oil well wall, adopt from top to bottom multi-section multi-layer spiral perforation anchor formula fracturing technique, the crack of at present prior art pressure break formation is like oil drum is kept flat, the crack that the present technique pressure break forms is like oil drum is stood upside down, utilize to greatest extent the terrestrial gravitation displacement of reservoir oil, utilize fracturing technique to enlarge the oil impregnate hole, accelerate oil impregnate speed, increase the oil recovery area, farthest improve oil recovery factor.
Description of drawings
Fig. 1 is top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method casing programme schematic diagram of the present invention.
Fig. 2 is Fig. 1 upward view.
The specific embodiment
Such as Fig. 1, shown in Figure 2, top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method of the present invention, utilize the original discarded old oil well 1 in oil field, then around oil reservoir 3 bottom 0.2-30 rice bran oil wells, carry out several top rade perforations, perforation 2 top rades are 1 °-45 °, this perforation 2 is from oil well 1 360 in the shape of a spiral segmentation distributions all around, around the oil well 1,2-16 perforated interval established in oil reservoir 3 bottoms, beat several perforations 2 in each perforated interval, the present invention adopts from top to bottom multi-section multi-layer spiral perforation, gradation packing multi-section multi-layer anchor formula fracturing technique, so that the gradation lower packet carries out pressure break, enlarge the oil impregnate hole, from top to bottom perforation, pressure break, its effect are that seam is made in guiding downwards, this technology cans be compared to the ditching diversion, crude oil flows to oil well 1 by perforation 2 and crack under the terrestrial gravitation effect, put into oil well pump in oil well 1 oil reservoir 3 bottoms, extracts out to get final product.Prior art all is that oil pump is placed on oil reservoir top, and oil pump of the present invention is placed on oil well 1 oil reservoir 3 bottoms, takes full advantage of the terrestrial gravitation displacement of reservoir oil, utilizes fracturing technique to enlarge the oil impregnate hole, accelerates oil impregnate speed, increases the oil recovery area, farthest improves oil recovery factor.
Pressure break of the present invention is conventional fracturing technique, make and split as in old oil well 1 and perforation 2, squeezing into fracturing fluid, 2 trend is anchor formula shape to fracturing fluid in the fracturing technique of the present invention from oil well 1 to perforation, its fracture strike and ductility are more wide, then in the crack, add the sand supporting crack, so that draining.
Perforation of the present invention (2) is provided with top rade, so that the control fractuer direction can increase fracture length greatly adding equally under the sand amount.
Perforating technology can adopt the gunpowder perforating gun, also can be high-pressure water jet, also can be drill bit and explosive and propellant.
Top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method of the present invention is applicable to the old well in exhausted oil field and further exploits utilization, can be brought up to about 80% by present ultimate recovery about 35%.
Embodiment 1: utilize the original discarded old oil well 1 in oil field, oil well 1 circumference is divided into four quadrants, at first carry out 30 ° of perforations of several top rades at oil reservoir 3 bottoms 0.2 rice bran oil well, 1 circumference first quartile, then carry out 45 ° of perforations of several top rades at oil reservoir 3 bottoms 8 rice bran oil wells, 1 second quadrant, carry out 1 ° of top rade at oil reservoir 3 bottoms 20 rice bran oil wells, 1 circumference third quadrant and beat several perforations 2, the like, 30 rice bran oil wells, 1 circumference fourth quadrant is carried out 8 ° of perforations of several top rades in oil reservoir 3 bottoms, this perforation 2 is from oil well 360 ° of in the shape of a spiral segmentation distributions all around, four layers of perforated interval have distributed around the present embodiment oil well 1, as shown in Figure 2, this perforation 2 is like the umbellate form irrigation canals and ditches, adopt multilayer anchor formula fracturing technique at the perforation place, adding sand in the crack supports, crude oil flows to oil well by perforation 2 and crack under the terrestrial gravitation effect, put into oil well pump in oil well oil reservoir bottom, extracts out to get final product.
Embodiment 2: utilize the original discarded old oil well 1 in oil field, oil well 1 circumference is divided into four quadrants, at first beat the perforation 2 of 20 ° of several top rades at oil reservoir 3 bottoms 1 rice bran oil well, 1 circumference first quartile, then beat the perforation 2 of 30 ° of several top rades at oil reservoir 3 bottoms 5 rice bran oil wells, 1 circumference the second quadrant, beat the perforation 2 of 40 ° of several top rades at oil reservoir 3 bottoms 10 rice bran oil wells, 1 circumference third quadrant, beat the perforation 2 of 45 ° of several top rades in oil reservoir 3 bottoms 15 rice bran oil wells, 1 circumference fourth quadrant, the like, beat the perforation 2 of 20 ° of several top rades at oil reservoir 3 bottoms 20 meters oil wells, 1 circumference first quartile, perforation 2 is from oil well 1 360 ° of in the shape of a spiral segmentation distributions all around, five layers of perforated interval have distributed around the present embodiment oil well 1, adopt multilayer gradation packing anchor formula fracturing technique at perforation 2 places, adding sand in the crack supports, crude oil utilizes terrestrial gravitation to flow to oil well 1 by perforation and crack, put into oil well pump in oil well 1 oil reservoir 3 bottoms, extraction gets final product.
Embodiment 3: utilize the original discarded old oil well 1 in oil field, oil well 1 circumference is divided into four quadrants, at first beat 20 ° of perforations 2 of several top rades at oil reservoir 3 bottoms 0.5 rice bran oil well, 1 circumference first quartile, then beat 30 ° of perforations 2 of several top rades at oil reservoir 3 bottoms 4 rice bran oil wells, 1 circumference the second quadrant, 6 rice bran oil wells, 1 circumference third quadrant is beaten 40 ° of perforations 2 of several top rades in oil reservoir 3 bottoms, 8 rice bran oil wells, 1 circumference fourth quadrant is beaten 45 ° of perforations 2 of several top rades in oil reservoir 3 bottoms, the like, 10 rice bran oil wells, 1 circumference first quartile is beaten 45 ° of perforations 2 of several top rades in oil reservoir 3 bottoms ...Perforation 2 is from oil well 360 ° of in the shape of a spiral segmentation distributions all around, distribute around the oil well 1 six layers or seven layers, eight layers ..., 16 layers etc. perforated intervals, adopt multilayer anchor formula fracturing technique at perforation 2 places, adding sand in the crack supports, crude oil utilizes terrestrial gravitation to flow to oil well by perforation 2 and crack, put into oil well pump in oil well oil reservoir bottom, extraction gets final product.
Top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method of the present invention can be divided into several quadrants to oil well 1 circumference, and perforation 2 also can be different top rades in each quadrant around the oil well 1.
Claims (3)
1. top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method, it is characterized in that: the method is utilized the old oil well (1) in original exhausted oil field, then establish several top rade perforations (2) on every side at the oil well (1) of oil reservoir (3) bottom, this perforation (2) the following part well of oil reservoir (3) section around oil well (1) wall 360 ° in the shape of a spiral shape distribute, employing is multi-section multi-layer spiral perforation from top to bottom in oil reservoir (3) bottom, and carry out the technology of anchor formula pressure break, enlarge the oil impregnate hole, crude oil under Action of Gravity Field just as oil drum is stood upside down, compile in the oil well bottom by perforation (2) and fracturing fracture, oil well pump is put into oil well (1) crude oil junction recover the oil.
2. described top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method according to claim 1, it is characterized in that: described perforation (2) is distributed in oil reservoir (3) bottom 0.2-30 rice, described oil well (1) on every side, oil reservoir (3) bottom establishes 2-16 perforated zone.
3. described top rade perforation water conservancy diversion anchor formula pressure break umbellate form irrigation canals and ditches gravity oil production method according to claim 1 and 2, it is characterized in that: described perforation (2) top rade is 1 °-45 °.
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| CN2012104371919A CN102953712A (en) | 2012-11-01 | 2012-11-01 | Upper tilting perforation diversion anchored fracturing umbrella ditch gravity oil production method |
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| CN2012104371919A CN102953712A (en) | 2012-11-01 | 2012-11-01 | Upper tilting perforation diversion anchored fracturing umbrella ditch gravity oil production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174403A (en) * | 2013-03-08 | 2013-06-26 | 中国石油天然气股份有限公司 | Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247930A (en) * | 1998-05-27 | 2000-03-22 | 特克马克国际发展公司 | Multiple effluent method for producing petroleum from tar sand |
| US6135205A (en) * | 1998-04-30 | 2000-10-24 | Halliburton Energy Services, Inc. | Apparatus for and method of hydraulic fracturing utilizing controlled azumith perforating |
| CN101387195A (en) * | 2007-09-14 | 2009-03-18 | 刘坤芳 | Reverse-branch Hole gravity oil drainage extraction technology |
| US20090242198A1 (en) * | 2008-03-26 | 2009-10-01 | Baker Hughes Incorporated | Selectively Angled Perforating |
-
2012
- 2012-11-01 CN CN2012104371919A patent/CN102953712A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6135205A (en) * | 1998-04-30 | 2000-10-24 | Halliburton Energy Services, Inc. | Apparatus for and method of hydraulic fracturing utilizing controlled azumith perforating |
| CN1247930A (en) * | 1998-05-27 | 2000-03-22 | 特克马克国际发展公司 | Multiple effluent method for producing petroleum from tar sand |
| CN101387195A (en) * | 2007-09-14 | 2009-03-18 | 刘坤芳 | Reverse-branch Hole gravity oil drainage extraction technology |
| US20090242198A1 (en) * | 2008-03-26 | 2009-10-01 | Baker Hughes Incorporated | Selectively Angled Perforating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174403A (en) * | 2013-03-08 | 2013-06-26 | 中国石油天然气股份有限公司 | Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir |
| CN103174403B (en) * | 2013-03-08 | 2016-08-10 | 中国石油天然气股份有限公司 | Thick-layer drives unitized production method containing the gravity every interlayer common heavy oil reservoir with steam |
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Application publication date: 20130306 |