CN2234502Y

CN2234502Y - Hydraulic pulse injection water nozzle

Info

Publication number: CN2234502Y
Application number: CN 94247787
Authority: CN
Inventors: 徐国兴; 瞿瑞阶; 刘文兴
Original assignee: No1 Oil Production Factory Daqing Petroleum Administration
Current assignee: No1 Oil Production Factory Daqing Petroleum Administration
Priority date: 1994-12-14
Filing date: 1994-12-14
Publication date: 1996-09-04
Anticipated expiration: 2004-12-14

Abstract

The utility model relates to a hydraulic pulse injection water nozzle which can be used for an eccentric water distributor of separate injection wells in oil fields. Delivered into wells following a pipe column, the utility model can carry out running and pulling regulation and can increase water injection rate. The inlet and the outlet of the both ends of a water injection nozzle (2) are formed into bell mouths (1, 4); the cavity diameter of the water injection nozzle (2) is wider than the width of the thinnest necks (phi 4, phi 5) to form a Helmholtz oscillator which can generate self-oscillation jet flow; the jet flow can generate periodic pressure oscillation and generate pressure disturbance waves. The pressure disturbance waves can be jetted in negative direction to the inlet end of the jet flow at a high speed and can cause the fluctuation of jet flow bundle on the other hand.

Description

Waterpower pulse augmented injection water is chewed

The utility model relates to the water distribution of eccentric injection mandrel on the separate layer water injection string of Shan field to be chewed, and belongs to can produce waterpower pulse augmented injection water and chew.

The field produces well is in drilling well, completion, production and well workover process, and the stratum can be subjected to various pollutions, makes the permeability decrease on stratum, near wellbore zone, influences Petroleum Production.In addition, the permeability of many oil reservoirs itself is just poor.The permeability of recovering contaminated stratum becomes the important channel of oil output.In order to recover the permeability of contaminated oil reservoir, the employing that has is carried out methods such as acidifying, pressure break and is changed reservoir permeability to the stratum, but that the shortcoming of these methods is selectivity is relatively poor, and device therefor is many in the work progress, complex procedures, cost height; In the construction operation process, also can produce new pollution and the obstruction of seam over the ground simultaneously.When oil field development,, adopt the scheme of limit exploitation marginal not water in order to realize high yield and stable yields.Water injection well is equipped with the water-filling method that water distribution is chewed by injection well downhole flow regulator is housed on the tubing string on the injection well downhole flow regulator, keep formation pressure, can improve oil production fluid amount.In-place permeability is low and stop up for above-mentioned reasons, influence water injection rate and flood effectiveness, chewing because of water distribution on the present water injection well tubing string injection well downhole flow regulator is isometrical cavity, import and export with water and chew chamber with the footpath, only play channeling, do not produce other effect, low permeability formation is not had the effect of de-plugging and augmented injection, can not satisfy water flood field high yield and stable yields and accelerate the needs of exploitation.

It is not enough in the above-mentioned prior art that the purpose of this utility model is to avoid, produce self-oscillatory waterpower pulse augmented injection water and chew and provide a kind of, can improve the infiltration condition on contaminated stratum, the pressure of increasing export, water injection rate is increased, help the exploitation of water flood field.

It is according to Helmholtz's formula oscillator principle that the purpose of this utility model realizes, makes water chew shape such as Helmholtz's formula self-excitation fluidic generator, and the import and export at the two ends that water filling is chewed forms horn mouth, and the footpath, chamber that water is chewed is greater than two ends the thinnest bell-mouthed neck size.Oscillator produces the High-frequency water jet, affacts the oil reservoir position, helps the raising of permeability; Affact by the stratum of blocking layer, make mechanical admixture and obstruction loosening, discharge with fluid during well-flushing, reach the mediation stratum, remove and stop up the purpose that water injection rate is increased, help Oilfield developing.

The utility model is chewed to compare with above-mentioned existing water can have following effect: according to Helmholtz's formula oscillator principle, adopt this water to chew and can produce the High-frequency water jet, affact the oil reservoir position and can dredge the stratum, improve infiltration condition; Affact blocked stratum, make mechanical admixture and other obstruction loosening, discharge with fluid when washing also, these all reach the purpose of augmented injection.Can quicken and improve Oilfield developing.Adopting this water to chew simultaneously, is to adopt original water distribution process test technology, can save investment, and stronger practicality is arranged, and does not produce harmful effect; Adopt this water to chew to improve and inject water solid phase particles and out-phase drop dispersed homogeneous degree, make it be difficult on wall attached to the oil reservoir hole the anti-blocking effect of de-plugging being arranged at water.

Fig. 1 is that water is chewed the installation drawing on injection well downhole flow regulator;

Fig. 2 is that water is chewed 2 complete section diagrammatic sketch on Fig. 1.

To be further described utility model below in conjunction with accompanying drawing: by shown in Figure 1, it is the bottoms that are contained in injection well downhole flow regulator that this water chews 2, under water injection well in oil fields tubing string lower going-into-well.By shown in Figure 2, this water filling chews 2 according to Helmholtz's formula oscillator principle, and the import and export that makes water filling chew 2 two ends forms horn mouth (1,4), and the thinnest neck footpath (∮ 4, ∮ 5) of 2 body portion chamber footpath ∮ 3 greater than two horn mouths (1,4) chewed in water filling.

The axial height of above-mentioned horn mouth 1 is higher than the axial height of horn mouth 4, can be higher than 3 millimeters.The maximum caliber ∮ 1 of horn mouth 1 is greater than the maximum caliber ∮ 2 of

horn mouth

4, and 2 chamber is chewed in the maximum caliber ∮ 2 of horn mouth 4 and water filling simultaneously, and directly ∮ 3 is identical.The lowest calibre ∮ 4 of horn mouth 1 neck is less than the lowest calibre ∮ 5 of horn mouth 4 necks.

Claims

1, a kind of waterpower pulse augmented injection water is chewed, have on the separated-zone water infection oil field well casing post and on injection well downhole flow regulator, the injection well downhole flow regulator water filling is housed and chews, it is characterized in that: the import and export that (2) two ends are chewed in water filling forms horn mouth (1,4), and water filling chews 2) footpath, chamber (∮ 3) greater than the thinnest neck footpath (∮ 4, ∮ 5) of horn mouth (1,4).

2, water filling according to claim 1 is chewed, and it is characterized in that: the axial height the former (1) of two horn mouths (1,4) is higher than the latter (4), can be higher than 3 millimeters.

3, water filling according to claim 2 is chewed, and it is characterized in that: the maximum caliber of two horn mouths (1,4) (∮ 1, ∮ 2) the former (∮ 1) greater than the latter (∮ 2), simultaneously latter's bore (∮ 2) chew (2) with water filling the chamber directly (∮ 3) identical.

4, water filling according to claim 3 is chewed, and it is characterized in that: the lowest calibre (∮ 4, ∮ 5) of two horn mouths (1,4) neck the former (∮ 4) less than the latter (∮ 5).