CN102116145A - Method for increasing yield and injection of low-permeability oil field - Google Patents
Method for increasing yield and injection of low-permeability oil field Download PDFInfo
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- CN102116145A CN102116145A CN2011100681682A CN201110068168A CN102116145A CN 102116145 A CN102116145 A CN 102116145A CN 2011100681682 A CN2011100681682 A CN 2011100681682A CN 201110068168 A CN201110068168 A CN 201110068168A CN 102116145 A CN102116145 A CN 102116145A
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- eyelet
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- permeability oil
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Abstract
The invention relates to a method for increasing the yield and the injection of a low-permeability oil field, comprising the following steps of: (1) determining the jet parameters of a horizontal hole; (2) carrying out the jetting of the horizontal hole; (3) carrying out the jetting of the horizontal hole as follows: dividing fractured intervals; selecting a fracturing fluid; determining the half length of a fissure; and selecting a fracturing string. The method combines the horizontal hole with fracture for application, shortens the displacement distance for a first time to play a well pattern regulating role by sufficiently utilizing the advantage that a water-power deep penetration technology is not limited by ground stress, the jet aperture is larger and the jet distance is long, then carries out oil-water well corresponding fracture by utilizing jet holes, forms meshed cracks which mutually communicate by combining with the direction of the ground stress, shortens the displacement distance for a second time to be within a limited well spacing and enlarges the seepage area, thereby fundamentally solving the problem that a yield and injection increase measure of the low-permeability oil field is limited and having great significance on the high-efficiency development of low-permeability oil field.
Description
Technical field
The present invention relates to oil recovery field, oil field a kind of crude oil increasing yield and injection method, especially a kind of hyposmosis oil well increasing yield and injection method.
Background technology
Along with deepening continuously of China's oil exploitation, the permeability of the nearly well area oil reservoir of low permeability oil field rock stratum often determining the efficient height of oil mining and output how much.With usual employing fracturing, intensive boring, fire the recovery ratio that technical measures such as pressure break, acidifying, perforation improve low-permeability oil deposits, but effect is not very desirable always, conventional perforation, its hole depth of acid fracturing are less than 1m, the pressure break degree of depth is difficult to control; The high enegry gas fracturing degree of depth is limited, closed fast, and period of validity is short.
Low permeability oil field exists that well yield is low, water injection pressure is high, the restricted problem of increasing yield and injection measure.And because low permeability oil field technological limit well spacing is little, be difficult to realize shortening well spacing, set up effective displacement, be difficult to realize the increasing yield and injection effect by conventional monotechnics.
Summary of the invention
In order to overcome the deficiency that exists in the background technology, the invention provides a kind of method of low permeability oil field increasing yield and injection, this method has proposed the lateral aperture technology and has combined with fracturing technique, by spraying eyelet, break through area of stress concentration, set up the combined stresses field, spatially change the crack and play knick point, by eyelet the crack is derived, the gull control area utilizes hole seam combination, forms seam and links up with seam, further shorten the displacement distance, set up effective displacement system.
Technical scheme of the present invention comprises following step:
(1), horizontal eyelet sprays: according to the nozzle parameter of the lateral aperture of determining, the applying high voltage hydraulic jeting device carries out the injection of horizontal eyelet;
Determine nozzle parameter;
1), determines to spray the eyelet direction;
2), spray eye diameter≤50mm, length≤100m;
(2) lateral aperture pressure break:
To penetrate lateral aperture layer position and carry out pressing crack construction.
The present invention has following advantage: the present invention adopts technique scheme, lateral aperture is combined application with pressure break, having made full use of waterpower deep penetration technology is not subjected to geostatic stress restriction, injection aperture to reach jet length advantage far away greatly, oil, the corresponding perforation of well, displacement apart from the distance that is shortened to two lateral aperture tops by distance between the original oil-water well, is carried out shortening for the first time and promptly played the effect of adjusting well pattern.Utilize the eyelet that is sprayed to carry out the corresponding pressure break of oil-water well then, stress direction in combination, form map cracking, seam is linked up with seam, displacement distance is further shortened to distance between the parallel crack by the distance on two lateral aperture tops, carried out shortening for the second time, and then set up effective displacement, realized the low permeability oil field increasing yield and injection.
This method organically combines the advantage of two technology, give full play to its technical advantage, the displacement distance is contracted within the critical spacing, and enlarge seepage area, fundamentally solved the restricted problem of low permeability oil field increasing yield and injection measure, significant to the efficient exploitation of low permeability oil field.
Description of drawings:
Fig. 1 is that lateral aperture and stress direction are angled, and pressure break is made and met schematic diagram;
Fig. 2 is that lateral aperture is intimate identical with stress direction, and pressure break is made and met schematic diagram.
The specific embodiment:
Below the invention will be further described: this lateral aperture combines the increasing yield and injection method of using and comprises the following steps: with pressure break
(1) injection of lateral aperture: the nozzle parameter of determining lateral aperture:
Because the waterpower deep penetrating perforating is subjected to stratigraphic dip, the influence of hole angle and injection direction is bigger, uses solid geometry knowledge, sets up horizontal section length and stratigraphic dip in the oil reservoir, the relational expression of hole angle and injection direction.
Because the perforation direction can design arbitrarily along 360 ° of directions, therefore, determine to spray on the perforation direction ultimate range of eyelet in oil reservoir, key is to determine the angle of eyelet track and horizontal direction on any direction
When the angle that perforation orientation is become with direction of deflection
The time,
When the angle that perforation orientation is become with direction of deflection
The time,
First kind of situation, when the eyelet course bearing is opposite with the stratigraphic dip direction,
Second kind of situation, when the eyelet course bearing is identical with the stratigraphic dip direction,
In the following formula,
Be hole angle,
Be stratigraphic dip,
Be the horizontal eyelet distance in the oil reservoir again.
Use the expression formula set up, and stress direction in combination, consider that the later stage cooperates pressure break, well spacing is foreshortened in the critical spacing, finally determine injection direction and spray penetration.Spray eye diameter≤50mm, length≤100m.
(2) spray horizontal eyelet:
According to the nozzle parameter of the lateral aperture of determining, the applying high voltage hydraulic jeting device carries out the injection of horizontal eyelet.
(3) lateral aperture pressure break
1. divide fractured interval:
In order to make the independent fracturing reform of minor diameter bore hole lateral aperture well section, therefore fractured interval to be divided, and in fracturing process, carried out Crack Monitoring, the judgement crack is opened and is split the position.
2. select fracturing fluid:
According to the geological conditions of test well place block, and use for reference this block pressure break experience in early stage, preferred fracturing fluid and fracturing technology.
3. determine the fracture half-length:
Consider the existence of horizontal eyelet, may exert an influence that the crack starter locations different to the crack carry out numerical simulation, optimize fracture parameters the crack starter location in crack.Main half length of stitching of design is 100m, but considers simultaneously may form in the process and prop up a crack, and the pressure break scale is pressed the 140m design, the of the fracturing fluid consumption of increasing in the construction.
4. select fracturing string:
Consider in the fracturing process and may open many cracks that cause operation pressure to raise, in order to ensure finishing smoothly of safety and construction, the N80 external upset (EU) fracturing string of withstand voltage 70MPa, the packer of the high temperature high voltage resistant of supporting employing Y341-114 are adopted in design.
Embodiment 1,
Choose the good but poor properties of reservoir communication, the well that the water filling problem is outstanding is carried out crushing test behind the waterpower deep penetrating perforating.Use the formula the set up calculating of programming, obtain different perforation directions, under the Different Strata inclination angle, the ultimate range of horizontal eyelet in oil reservoir, final confirmed test layer position is main layer PI2 and PI6 layer, the perforation direction is NE15 ° and NE45 °, and perforation length is 100m, and the lateral aperture that at first divides both direction to finish 5 eyelets sprays.
1. determine parameter: the crack starter location of considering horizontal eyelet counterincision seam exerts an influence, and the crack starter locations different to the crack carry out numerical simulation, optimizes fracture parameters.Designing master's seam half length is 100m, still considers simultaneously to form a crack in the process, and the main length of stitching designs 100m, and a seam length is pressed the 40m consideration, and the pressure break scale is pressed 140m and designed, and strengthens of the fracturing fluid consumption in the construction.
2. select fracturing fluid:
Use for reference the experience of neat tame northern oil field riverfrac treatment in early stage, neat tame northern oil field relatively is suitable for riverfrac treatment, frictional resistance height during owing to riverfrac treatment, may produce many cracks when considering construction simultaneously, cause the operation pressure height, therefore, this adopts the low viscosity super guanidine gum solution of 5mPa.s.Consider that simultaneously this well is a well fracturing, the later stage water filling has progradation to proppant, and this time pressure break does not add fracturing propping agents.
3. determine discharge capacity:
Use for reference the experience of tame northern riverfrac treatment together, preliminary operational discharge capacity design 3.0-5.0m3/min carries out the small scale fracturing test before the pressure break, and is on-the-spot according to explanation results adjustment operational discharge capacity, guarantees smooth construction.
4. testing result: split position and fracture pattern for accurately judging opening of crack, carry out totally five monitorings of down-hole microseism, pollution-free isotope, ground microseism, ground potential, pressure bomb simultaneously.
This well in successful implementation on October 22 in 2010 pressure break, altogether pressure break is 2 layers, total liquid measure 300m3.This well does not absorb water when oil pressure 21.3MPa before the pressure break, and after the pressure break, November 2 drove a well, at following day injection allocation 10m3 of oil pressure 7.6MPa, and the real 10m3 that annotates, the real 40m3 that annotates under oil pressure 19.1MPa has added up augmented injection 264m3 at present, and the initial stage has been seen tangible augmented injection effect.From effect and testing result, lateral aperture combines the increasing yield and injection new method of using and can realize shortening the displacement distance twice with pressure break, utilizes hole seam combination, realizes stitching with seam and links up, and sets up effective displacement.The smooth implementation of this scheme has proved the feasibility of minor diameter open-hole horizontal well pressure break, is to solve our factory low permeability oil field suction difficulty, can not set up the problem of effective driving body system, has explored a new approach.
Claims (2)
1. a low permeability oil field increasing yield and injection method comprises the following steps:
(1), horizontal eyelet sprays: according to the nozzle parameter of the lateral aperture of determining, the applying high voltage hydraulic jeting device carries out the injection of horizontal eyelet;
Determine nozzle parameter;
1), determines to spray the eyelet direction;
2), spray eye diameter≤50mm, length≤100m;
(2) lateral aperture pressure break:
To penetrate lateral aperture layer position and carry out pressing crack construction.
2. low permeability oil field increasing yield and injection method according to claim 1 is characterized in that: the determining of lateral aperture nozzle parameter:
When the angle that perforation orientation is become with direction of deflection
The time,
When the angle that perforation orientation is become with direction of deflection
The time,
First kind of situation, when the eyelet course bearing is opposite with the stratigraphic dip direction,
Second kind of situation, when the eyelet course bearing is identical with the stratigraphic dip direction,
In the following formula,
Be the angle of eyelet track and horizontal direction,
Be hole angle,
Be stratigraphic dip,
Be the horizontal eyelet distance in the oil reservoir again;
Use the expression formula set up, and stress direction in combination, well spacing is foreshortened in the critical spacing, determine injection direction and spray penetration.
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| CN2011100681682A CN102116145A (en) | 2011-03-22 | 2011-03-22 | Method for increasing yield and injection of low-permeability oil field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126052A (en) * | 2011-09-14 | 2014-10-29 | 贝克休斯公司 | Method for determining fracture spacing and well fracturing using same |
| CN104963671A (en) * | 2015-06-17 | 2015-10-07 | 中国石油化工股份有限公司 | Fracturing transformation method of highly-deviated cluster well reservoir |
| CN108732010A (en) * | 2017-04-24 | 2018-11-02 | 中国石油天然气股份有限公司 | A kind of simulation of fracturing fracture and evaluating apparatus and method |
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| US20050247447A1 (en) * | 2004-05-10 | 2005-11-10 | Spring Roger L | Angled perforating device for well completions |
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2011
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| US5499678A (en) * | 1994-08-02 | 1996-03-19 | Halliburton Company | Coplanar angular jetting head for well perforating |
| US20050247447A1 (en) * | 2004-05-10 | 2005-11-10 | Spring Roger L | Angled perforating device for well completions |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126052A (en) * | 2011-09-14 | 2014-10-29 | 贝克休斯公司 | Method for determining fracture spacing and well fracturing using same |
| CN104126052B (en) * | 2011-09-14 | 2017-10-03 | 贝克休斯公司 | Method and the well pressure break using methods described for determining crack spacing |
| CN104963671A (en) * | 2015-06-17 | 2015-10-07 | 中国石油化工股份有限公司 | Fracturing transformation method of highly-deviated cluster well reservoir |
| CN104963671B (en) * | 2015-06-17 | 2017-12-29 | 中国石油化工股份有限公司 | A kind of fracturing reform method of High angle from formula well reservoir |
| CN108732010A (en) * | 2017-04-24 | 2018-11-02 | 中国石油天然气股份有限公司 | A kind of simulation of fracturing fracture and evaluating apparatus and method |
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Application publication date: 20110706 |