CN103061712B - A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute - Google Patents
A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute Download PDFInfo
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- CN103061712B CN103061712B CN201210567644.XA CN201210567644A CN103061712B CN 103061712 B CN103061712 B CN 103061712B CN 201210567644 A CN201210567644 A CN 201210567644A CN 103061712 B CN103061712 B CN 103061712B
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Abstract
The present invention relates to a kind of eddy flow acid washing method and device, wherein, described device has the centralizer, Rotation Controllers, the spray gun that are connected successively from top to bottom, spray gun can be connected with described Rotation Controllers rotationally, spray gun is hollow column, be cylinder in the middle part of it, the plane section cone anterior, rear portion is formed as tapered diameter respectively, the front end of anterior plane section cone forms an internal taper hole; In the middle part of spray gun, sidewall is evenly equipped with multiple side direction spray-hole, side direction spray-hole is set for the eccentric, under action of a fluid spray gun energy automatic rotation; Spray gun rear portion is provided with backward spray-hole, and the backward jet of generation is conducive to suspension pit shaft deposit and from the mud cake that the borehole wall comes off, prevents from depositing in pit shaft.Method of the present invention can not only increase the radial impact effect of pickle to the borehole wall, improve the seepage flow pressure reduction of acid solution, increase depth of interaction and the effect of acid solution, acid solution can also be strengthened to cleaning suspension effect sedimental in pit shaft, improve the permeability near wellbore stratum.
Description
Technical field
The present invention relates to oil gas field storey increase design technical field, especially rotating jet combines with common pickling technology by one, realizes eddy flow acid washing method and the acid dip pickle of removing the pollution of Oil/gas Well near wellbore zone.
Background technology
In past 20 years, the application of horizontal well in exploration, exploitation, production is rapidly developed.Horizontal well can increase the contact area of pit shaft and oil reservoir, the output improving oil gas and final recovery ratio.But horizontal well contacts with reservoir due to the long-time large area of working solution, its solid phase and liquid phase enter borehole wall surrounding formation, the pollution be subject to and injury also more serious, this will inevitably formation damage, form pollution in wide area band, cause near wellbore zone oil layer blocking, horizontal productivity declines, and affects the effect of horizontal well development.Therefore, need to adopt pickling de-plugging treatment measures in the development process of some horizontal well, dredging near wellbore zone seepage channel, recovers and improves Oil & Gas Productivity.
In the last few years, because the length of horizontal segment constantly increases, not only acid solution consumption is large to adopt traditional general cloth technic acid, and acid solution easily concentrates consumption in certain well section, is difficult to the uniform acid distribution realizing full net horizontal section.
But adopt general fixed point pickling operation, namely the fixed point pickling to certain well section is realized by the fixing downhole hardware of work string (normally coiled tubing) end, although the fixed point pickling operation of horizontal well can be realized, save acid solution use amount, but the reaction contact area of acid solution and the borehole wall is restricted to a certain extent, and it is limited to impact the tangential shear action that on the borehole wall, sour jet produces, stronger shear action can not be formed to drilling fluid mud cake, affect the releasing of drilling fluid mud cake, therefore pickling effect is not very good.
Because the defect that known technology exists, the present inventor is according to the Production design experience being engaged in this area and association area for many years, develop the eddy flow acid washing method and acid dip pickle that pollute releasing Oil/gas Well near wellbore zone of the present invention, realize the fixed point pickling operation to net horizontal section, save acid solution use amount, improve pickling de-plugging efficiency.
Summary of the invention
The object of this invention is to provide a kind of eddy flow acid washing method and the device of removing the pollution of Oil/gas Well near wellbore zone, to overcome known general cloth acid method and conventional fixed point acid washing method Problems existing in pickling de-plugging application in horizontal well, rotating jet and common acids washing method are combined, the releasing efficiency of well contaminated zone near well of improving the standard.
For this reason, the present invention proposes a kind of eddy flow acid dip pickle, and have the centralizer, Rotation Controllers, the spray gun that are connected successively from top to bottom, the top of described acid dip pickle is fixedly connected with coiled tubing by box cupling; Described spray gun can be connected with described Rotation Controllers rotationally, and described spray gun is hollow column, is cylinder in the middle part of it, the plane section cone anterior, rear portion is formed as tapered diameter respectively, and the front end of the plane section cone of front portion forms an internal taper hole; Sidewall is evenly equipped with multiple side direction spray-hole in the middle part of described spray gun, and described side direction spray-hole is set for the eccentric, under action of a fluid described spray gun energy automatic rotation; Described spray gun rear portion is provided with backward spray-hole, and the backward jet ejected is conducive to suspension pit shaft deposit and the borehole wall come off mud cake, prevents it from depositing in pit shaft.
Eddy flow acid dip pickle as above, wherein, described spray gun sidewall is provided with multiple jetted layers, and each jetted layers is provided with 4-6 uniform described side direction spray-hole; The exit inside diameter of described side direction spray-hole is 3-6mm, and its axis is equal apart from the eccentric distance of described spray gun center line, is 0.25-0.5 times of spray gun internal diameter.
Eddy flow acid dip pickle as above, wherein, the angle between the axis of described side direction spray-hole and the tangent line of described lance outer surface point of intersection is 50-70 °.
Eddy flow acid dip pickle as above, wherein, the axis of described side direction spray-hole and the parallel lines angle of described spray gun center line are 60-80 °, and the ejiction opening of described side direction spray-hole tilts towards the rear portion of described spray gun.
Eddy flow acid dip pickle as above, wherein, described spray gun rear portion is provided with two backward spray-holes, described backward spray-hole arranges the stage casing at described spray gun rear portion with 180 ° of phase angles, its spray-hole exit inside diameter 3-6mm, the axis of described backward spray-hole is crossing with the center line of described spray gun, the angle of-60 ° at 45 ° of its shape, the ejiction opening direction of described backward spray-hole tilts backwards, and the bus angle of its axis and described spray gun rear portion plane section cone is 70-90 °.
The present invention also proposes a kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute, and comprising:
1) according to reservoir characteristic and reservoir characteristics, pickling operation interval is determined;
2) by coiled tubing, the eddy flow acid dip pickle as above being connected to its underpart is needed the bottommost carrying out pickling operation interval in pit shaft, pickling operation is carried out step by step according to order from top to bottom;
3) to pitching in described spray gun, the internal taper hole that this ball can close described spray gun front end forms one way valve;
4) in coiled tubing and annular space, pickle is injected;
5) when pickle enters eddy flow acid dip pickle, spray gun automatic rotation described in the jet propulsion sprayed by described side direction spray-hole, the eccentric jet impulse borehole wall simultaneously, produce non-homogeneous cross flow field, thus form annular space eddy flow field, under the effect of described annular space eddy flow field, the mud cake on the borehole wall is come off;
6) in the pickling operation process of each interval, reclaim described coiled tubing with the recovery speed specified, make described coiled tubing drive described eddy flow acid dip pickle to move up, until complete the pickling operation of this interval; Meanwhile, the mud cake that the sustained firing effect of backward spray-hole is conducive to deposit in suspension pit shaft and comes off, prevents it from depositing in pit shaft;
7) when after the pickling operation completing an interval, by described coiled tubing, described rotation acid dip pickle is risen to the bottommost of next interval, repeat above-mentioned steps, until complete the pickling operation of whole pickling operation interval.
The eddy flow acid washing method that releasing Oil/gas Well near wellbore zone as above is polluted, wherein, jet wherein a part of radial impact borehole wall of the described side direction spray-hole ejection of eccentric setting, make the cake crushing on the borehole wall, another part tangentially acts on the pickle in described annular space, form described annular space eddy flow field, in the effect of the tangential force of described annular space eddy flow field, broken described mud cake can come off from the borehole wall.
The eddy flow acid washing method that releasing Oil/gas Well near wellbore zone as above is polluted, wherein, after described mud cake comes off, the radial jet that described side direction spray-hole continues in the pickle of ejection can enter in the stratum around the borehole wall, dredging near wellbore zone seepage channel, realizes pickling de-plugging.
The eddy flow acid washing method that releasing Oil/gas Well near wellbore zone as above is polluted, wherein, when the pressure in annular space is greater than strata pressure, described pickle can infiltrate in stratum, removes the blocking material in hole or crack, strengthens the flow conductivity on stratum.
The eddy flow acid washing method that releasing Oil/gas Well near wellbore zone as above is polluted, wherein: the acid filling intensity in described pickle is at 0.1-0.3m
3between/m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m; The pickling liquid measure injected in described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than reservoir fracture pressure; Drag the speed of described coiled tubing between 1.0-2.0m/s.
The multiply directed jet that the present invention is sprayed by eddy flow acid dip pickle side direction spray-hole, annular space eddy flow field can be produced in pit shaft, because multiple jets is all act on pit shaft wall with certain inclination angle, namely the incident direction of jet and the normal direction of wall have certain angle, the distribution of the wall cross flow therefore produced is heterogeneity, also impels the formation of annular space inner fluid tangential velocity thus and produces tangential forces.When using in open hole well, first under the effect of jet radial impact power, there is fragmentation to a certain degree, then under the lateral shear effect of the tangential force produced by annular space eddy flow field, come off from the borehole wall in the drilling fluid mud cake on the borehole wall.After mud cake comes off, the acid solution jet that post-injection goes out can enter in the stratum around the borehole wall, and dredging near wellbore zone seepage channel, reaches the object of pickling de-plugging.When in annular space, pressure is greater than strata pressure, a part of acid solution can also enter inside, stratum, removes the blocking material in hole or crack, strengthens the flow conductivity on stratum.In addition, deposit in the mud cake come off and pit shaft can be carried out pit shaft by backward spray-hole.
Rotation acid washing method of the present invention, overcomes the limitation of general cloth technic acid and general fixed point cloth technic acid traditionally, rotating jet technology and common Acidizing Technology is combined, can improve the pickling plugging removal effect of near wellbore zone to a great extent.The normal direction of the present invention's incident direction and wall of also taking full advantage of side direction jet has the annular space eddy flow field that non-homogeneous wall cross flow that certain angle produces is formed in addition, utilize the tangential velocity of this eddy flow place forming, change conventional fixed point pickling jet to the mode of action of the borehole wall, the percussion of a side direction can be produced to the borehole wall while, certain lateral scouring effect can also be formed to the borehole wall, be conducive to removing the mud cake be attached on the borehole wall, improve plugging removal effect.Therefore, method of the present invention can not only increase the radial impact effect of pickle to the borehole wall, improves the seepage flow pressure reduction of acid solution, increases depth of interaction and the effect of acid solution, acid solution can also be strengthened to cleaning suspension effect sedimental in pit shaft, thus improve the permeability near wellbore stratum.
For general cloth technic acid, adopt the fixed point pickling operation that device and method of the present invention can realize net horizontal section, save acid solution use amount; Spray for pickling operation relative to known fixed point, the rotating jet that method of the present invention produces not only has stronger radial impact effect, also by producing stronger tangential impact effect, particularly for open hole well, the releasing efficiency of drilling fluid mud cake can be improved, strengthen plugging removal effect.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is eddy flow acid dip pickle structural representation of the present invention;
Fig. 2 A, Fig. 2 B are the spray gun elevational schematic view of eddy flow acid dip pickle of the present invention;
Fig. 3 is the cross-sectional schematic along A-A line in Fig. 2 A;
Fig. 4 is the cross-sectional schematic along B-B line in Fig. 2 B;
Fig. 5 is the cross-sectional schematic along C-C line in Fig. 2 B;
Fig. 6 be need to carry out eddy flow pickling operation oil well in the distribution schematic diagram of each pickling operation interval;
Fig. 7 adopts eddy flow acid washing method of the present invention to carry out the schematic diagram of pickling operation to interval in Oil/gas Well;
Fig. 8 adopts eddy flow acid washing method of the present invention to carry out the schematic diagram of pickling operation to another interval in Oil/gas Well;
Fig. 9 is the annular space eddy flow field schematic diagram that the present invention is formed at eddy flow acid cleaning process.
Drawing reference numeral illustrates:
1, eddy flow acid dip pickle 2, spray gun 20, side direction spray-hole 21, backward spray-hole
22, internal taper hole 3, Rotation Controllers 4, centralizer 5, box cupling
6, coiled tubing 7, bearing 8, pickling operation interval 9, pickling operation interval
10, pickling operation interval 11, jet 12, annular space eddy flow field streamline 13, annular space
Detailed description of the invention
A kind of eddy flow acid dip pickle that the present invention proposes, have the centralizer, Rotation Controllers, the spray gun that are connected successively from top to bottom, the top of described acid dip pickle is fixedly connected with coiled tubing by box cupling; Described spray gun can be connected with described Rotation Controllers rotationally, and described spray gun is hollow column, is cylinder in the middle part of it, the plane section cone anterior, rear portion is formed as tapered diameter respectively, and the front end of the plane section cone of front portion forms an internal taper hole; Sidewall is evenly equipped with multiple side direction spray-hole in the middle part of described spray gun, under action of a fluid described spray gun energy automatic rotation; Described spray gun rear portion is provided with backward spray-hole, with strengthen acid solution to pit shaft deposit and come off mud cake from the borehole wall carry cleaning performance.
The present invention also proposes a kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute, and comprising:
1) according to reservoir characteristic and reservoir characteristics, pickling operation interval is determined;
2) by coiled tubing, the eddy flow acid dip pickle as above being connected to its underpart is needed the bottommost carrying out pickling operation interval in pit shaft, pickling operation is carried out step by step according to order from top to bottom;
3) to pitching in described spray gun, the internal taper hole that this ball sealing closes described spray gun front end forms one way valve;
4) in coiled tubing and annular space, pickle is injected;
5) when pickle enters eddy flow acid dip pickle, spray gun automatic rotation described in the jet propulsion sprayed by described side direction spray-hole, the eccentric jet impulse borehole wall, produces non-homogeneous cross flow field simultaneously, thus forms annular space eddy flow field; Described rotation pickling jet drives the pickle in annular space to form annular space eddy flow field, under the effect of described annular space eddy flow field, the mud cake on the borehole wall is come off;
6) in the pickling operation process of each interval, reclaim described coiled tubing with the recovery speed specified, make described coiled tubing drive described eddy flow acid dip pickle to move up, until complete the pickling operation of this interval; Meanwhile, the mud cake that the sustained firing effect of backward spray-hole is conducive to deposit in suspension pit shaft and comes off, prevents its deposition in pit shaft;
7) when after the pickling operation completing an interval, by described coiled tubing, described rotation acid dip pickle is risen to the bottommost of next interval, repeat above-mentioned steps, until complete the pickling operation of whole pickling operation interval.
The multiply directed jet that the present invention is sprayed by eddy flow acid dip pickle side direction spray-hole, annular space eddy flow field can be produced in pit shaft, because multiple jets is all act on pit shaft wall with certain inclination angle, namely the incident direction of jet and the normal direction of wall have certain angle, the distribution of the wall cross flow therefore produced is heterogeneity, also impels the formation of annular space inner fluid tangential velocity thus and produces tangential forces.When using in open hole well, first under the effect of jet radial impact power, there is fragmentation to a certain degree, then under the lateral shear effect of the tangential force produced by annular space eddy flow field, come off from the borehole wall in the drilling fluid mud cake on the borehole wall.After mud cake comes off, the pickle jet that post-injection goes out can enter in the stratum around the borehole wall, and dredging near wellbore zone seepage channel, reaches the object of pickling de-plugging.When in annular space, pressure is greater than strata pressure, a part of acid solution can also enter inside, stratum, removes the blocking material in hole or crack, strengthens the flow conductivity on stratum.In addition, the mud cake that the backward jet that backward spray-hole produces is conducive to the deposit in suspension pit shaft and comes off, prevents its deposition in pit shaft.
Rotation acid washing method of the present invention, overcomes the limitation of general cloth technic acid and general fixed point cloth technic acid traditionally, rotating jet technology and common Acidizing Technology is combined, can improve the pickling plugging removal effect of near wellbore zone to a great extent.
For general cloth technic acid, adopt the fixed point pickling operation that device and method of the present invention can realize net horizontal section, save acid solution use amount; Spray for pickling operation relative to known fixed point, the rotating jet that method of the present invention produces not only has stronger radial impact effect, also by producing stronger tangential impact effect, particularly for open hole well, the releasing efficiency of drilling fluid mud cake can be improved.
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, below in conjunction with accompanying drawing and preferred embodiment, the eddy flow acid washing method pollute releasing Oil/gas Well near wellbore zone of the present invention and the detailed description of the invention of acid dip pickle, structure, feature and effect, be described in detail as follows.In addition, by the explanation of detailed description of the invention, when can to the present invention for the technological means reaching predetermined object and take and effect are goed deep into concrete understanding more, but institute's accompanying drawing be only to provide with reference to and use is described, is not used for being limited the present invention.
As Figure 1 and Figure 4, eddy flow acid dip pickle 1 of the present invention has the centralizer 4, Rotation Controllers 3, the spray gun 2 that are connected successively from top to bottom, the top of described eddy flow acid dip pickle is fixedly connected with coiled tubing 6 by box cupling 5, this spray gun 2 can be connected with described Rotation Controllers 3 by bearing 7 rotationally with the connected mode of routine, spray gun 2 is hollow column, it is cylinder in the middle part of it, the plane section cone anterior, rear portion is formed as tapered diameter respectively, and the front end of the plane section cone of front portion forms an internal taper hole 22; In the middle part of spray gun, sidewall is evenly equipped with multiple side direction spray-hole 20, this side direction spray-hole 20 is set for the eccentric, and spray gun 2 can automatic rotation under action of a fluid.The rear portion of spray gun 2 is provided with backward spray-hole 21, with strengthen acid solution to pit shaft deposit and come off mud cake from the borehole wall carry cleaning performance.
A feasible technical scheme is that spray gun 2 is provided with multiple jetted layers, and as shown in Figure 1, Figure 2 shown in A, Fig. 2 B, each jetted layers is provided with 4-6 side direction spray-hole 20, to increase projected area, improves pickling efficiency.Simultaneously in order to increase radial impact active force, at this spray-hole place, self-resonating cavitating jet nozzle can be installed.In addition, the exit inside diameter of described side direction spray-hole 20 is generally 3mm-6mm, and each side direction spray-hole 20 axis is equal apart from the eccentric distance L of spray gun 2 center line, is 0.25-0.5 times of spray gun internal diameter.
In addition, please refer to Fig. 2 A, the angle α between the axis of side direction spray-hole 20 and the tangent line of spray gun 2 external surface point of intersection can be 50-70 °.
Further, as shown in Figure 3, because side direction spray-hole 20 is eccentric settings, the axis of spray-hole and the center line of spray gun 2 are also non-intersect, 60-80 ° is generally with the space angle β of center line, that is, the parallel lines angle of axis spray gun 2 center line of side direction spray-hole 20 is 60-80 °, and the ejiction opening of side direction spray-hole 20 tilts towards the rear portion of described spray gun.Because side direction spray-hole 20 is arranged off-centre, its reaction force drives spray gun 2 automatic rotation, and side direction fluidic tilt impacts in well bore face, forms the wall cross flow field of non-uniform Distribution, and this is the major impetus forming annular space cyclonic effect.Pickle, by ejecting multiply directed jet after side direction spray-hole 20, produces rotation torque, under action of a fluid described spray gun energy automatic rotation, thus produces the pickle jet rotated.
In a feasible technology, as shown in Figure 5, the rear portion of spray gun 2 is provided with two backward spray-holes 21, and backward spray-hole 21 arranges the inclination conical surface stage casing at described spray gun rear portion with 180 ° of phase angles, and its exit inside diameter can be 3-6mm.The axis of backward spray-hole 21 is crossing with the center line of spray gun 2, the angle γ of-60 ° at 45 ° of structure, and the ejiction opening direction of described backward spray-hole 21 tilts backwards, and the bus angle δ of its axis and spray gun 2 rear portion plane section cone is 70-90 °.In addition, in order to improve the application life of spray gun 2, usually resistance to acid attack process is carried out to described side direction spray-hole 20 and backward spray-hole 21.
The rotational velocity of the spray gun of eddy flow acid dip pickle of the present invention can be controlled by coupled Rotation Controllers 3, the controller that this Rotation Controllers 3 can adopt this area conventional, such as damping due to rotation controller.
Please refer to Fig. 6 to Fig. 9, the eddy flow acid washing method that releasing Oil/gas Well near wellbore zone of the present invention is polluted comprises:
1) according to reservoir characteristic and reservoir characteristics, pickling operation interval is determined, as having three pickling operation intervals 8,9,10 in the embodiment shown in fig. 6;
2) by coiled tubing 6, the described eddy flow acid dip pickle being connected to its underpart is needed in pit shaft the bottommost of one of them the pickling operation interval carrying out pickling operation, pickling operation is carried out step by step according to order from top to bottom;
3) to pitching in spray gun 2, the internal taper hole 22 being arranged on spray gun front portion forms ball seat, and after pitching sets, this ball can be closed this internal taper hole 22 and form one way valve, pickle is not flowed out by spray gun 2 bottom, can only flow out from the side direction spray-hole 20 of spray gun 2 and backward spray-hole 21;
4) pickle is injected to coiled tubing 6 and annular space 13;
5) when pickle enters eddy flow acid dip pickle, jet propulsion spray gun 2 automatic rotation sprayed by the side direction spray-hole 20 of eccentric setting, the eccentric jet impulse borehole wall, produces non-homogeneous cross flow field simultaneously, thus in annular space 13, produce rotation pickling jet; Described rotation pickling jet drives the pickle in annular space to form annular space eddy flow field (representing with annular space eddy flow field streamline 12 in fig .9), under the effect of described annular space eddy flow field, the mud cake on the borehole wall is come off; After mud cake comes off, the acid solution jet that post-injection goes out can enter in the stratum around the borehole wall, and dredging near wellbore zone seepage channel, reaches the object of pickling de-plugging;
6) in the pickling operation process of each interval, reclaim described coiled tubing 6 with the recovery speed specified, make described coiled tubing 6 drive described eddy flow acid dip pickle to move up, until complete the pickling operation of this interval; Meanwhile, the sustained firing effect of backward spray-hole 21 mud cake that is conducive to deposit in suspension pit shaft and comes off;
7) when after the pickling operation completing an interval, by described coiled tubing 6, described rotation acid dip pickle is risen to the bottommost of next interval, repeat above-mentioned steps, until complete the pickling operation of whole pickling operation interval.
Wherein, the jet part wherein that the described side direction spray-hole 20 of eccentric setting sprays is the radial impact borehole wall, make the cake crushing on the borehole wall, another part then tangentially acts on the pickle in described annular space 13, form described annular space eddy flow field, in the effect of the tangential force of described annular space eddy flow field, contribute to broken described mud cake and come off from the borehole wall.
Further, after the mud cake on the borehole wall comes off, the radial jet that side direction spray-hole 20 continues in the pickle of ejection can be infiltrated in the stratum around the borehole wall, removes the blocking material in hole and crack, realizes pickling de-plugging; The mud cake come off and pit shaft deposit can be carried out pit shaft by the backward jet that backward spray-hole 21 ejects, and realize the abundant de-plugging of near wellbore zone.
In addition, when the pressure in annular space 13 is greater than strata pressure, a part of pickle can infiltrate in stratum, removes the blocking material in hole or crack, strengthens the flow conductivity on stratum.
In a specific embodiment, the acid filling intensity in described pickle is at 0.1-0.3m
3between/m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m.
The pickling liquid measure injected in described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than reservoir fracture pressure.
The speed of the described coiled tubing 6 of usual dragging is between 1.0-2.0m/s.
Device and method of the present invention is further illustrated below in conjunction with accompanying drawing.Rotating jet mechanism of production of the present invention is: the eccentric jet that the eccentric side of eddy flow acid dip pickle is formed to spray-hole 20 produces rotation torque, drive eddy flow acid dip pickle around its axis automatic rotation, thus generation rotating jet, the eccentric jet impulse borehole wall simultaneously, non-homogeneous cross flow field can be produced, thus form annular space eddy flow field.The rotating speed of eddy flow acid dip pickle can be regulated by the Rotation Controllers 3 being connected to spray gun 2 top.Its specific implementation is: according to operational discharge capacity, multilayer eccentric side can be set on the sidewall of spray gun 2 to spray-hole 20, as every layer can be arranged 4-6 side direction spray-hole 20, the axis of side direction spray-hole 20 and the central vertical distance L of spray gun 2 are 0.25-0.5 times of spray gun internal diameter, and the angle α between the tangent line at side direction spray-hole 20 Way out and lance outer surface place is 50-70 °.Because side direction spray-hole 20 is eccentric settings, therefore the axis of side direction spray-hole 20 and the center line of spray gun 2 non-intersect, the space angle β of itself and spray gun center line is 60-80 °, and the outlet of side direction spray-hole 20 is to the back sweep of spray gun 2, the side direction jet therefore produced also is tilt backwards (see Fig. 7-Fig. 9).Therefore high-speed jet 11 impacts on the borehole wall and can produce non-homogeneous cross flow field, and namely most cross flow does circumferential movement along the borehole wall, thus forms eddy flow field in pit shaft.In addition, according to Newton's second law, lateral eccentricity jet also can produce rotation torque to rotary spray gun 2, and drive spray gun 2 around the axis automatic rotation of eddy flow acid dip pickle, produce rotating jet, the rotating speed of device can be regulated by Rotation Controllers 3.Wherein, Rotation Controllers 3 can adopt controller general in the industry, as damping due to rotation controller.Centralizer 4 adopts sliding centralizer, be enclosed within device box cupling 5, because the internal diameter of centralizer 4 is slightly larger than box cupling 5 external diameter, and length is shorter, therefore can be movable within the specific limits, namely centralizer 4 can move up and down at box cupling and rotate, and owing to being adopt the conventional a kind of centralizer used in fracture acidizing operation, repeats no more.Internal taper hole 22 bottom spray gun in 1 forms ball seat, and after pitching sets, acid solution can not flow out from spray gun bottom, can only spray from side direction, backward spray-hole 20 and 21.
Before Specific construction, by needing the well section of carrying out pickling operation to be divided into some pickling operation intervals 8,9,10, can be continuous print between adjacent interval, also can be discontinuous.The segmentation method of pickling operation interval is identical with the principle that conventional stage acidifying adopts, each interval represents an independent duty cycle, when each interval carries out pickling operation, according to geological reservoir feature determination acid fluid system and the construction parameter of this interval, it can be identical also can be different that the infusion discharge capacity of different well section and coiled tubing reclaim speed, need formulate according to the concrete condition of operation interval, this is routine techniques, repeats no more.Be generally that infusion discharge capacity is stepped to be increased progressively along with pickling operation is constantly carried out, coiled tubing reclaims that speed is stepped successively decreases.
Such as select the acid fluid system based on hydrochloric acid for carbonate formation, select with mud acid or hydrofluoric acid for main acid liquid system for sandstone reservoir, acid solution specific category needs to determine according to the rock constituents of target zone with formula.
Acid filling intensity is generally at 0.1-0.3m
3between/m, occurrence will be determined according to the degree of contamination of reservoir and transformation requirement; Acid filling can adopt coiled tubing 6 and annular space 13 simultaneously injection mode carry out, the discharge capacity of coiled tubing 6 is generally 0.16-0.48m
3/ m, the injection discharge capacity of annular space 13 is the 60%-100% of oil pipe discharge capacity, but needs to ensure that bottom pressure is lower than reservoir fracture pressure; The dragging speed of coiled tubing 6 needs to determine, generally between 1.0-1.2m/s according to infusion discharge capacity, acid filling intensity and formation damage degree.
As shown in Figure 7, when carrying out pickling operation to an interval, coiled tubing 6 is used to arrive predetermined well section end by under eddy flow acid dip pickle, as the end of pickling operation interval 10, after ground flow is ready, start to infusion acid solution in coiled tubing 6 and annular space 13, acid solution can form multiple jets 11 by when the side direction spray-hole 20 of eccentric setting sprays on eddy flow acid dip pickle, according to Newton's second law, spray gun 2 can produce rotation torque under the effect of directed jet, drive spray gun 2 rotation, thus formed as shown in Figure 9 in annular space 13, the eddy flow field represented by annular space eddy flow field streamline 12.The acid solution be ejected on the borehole wall can remove drilling fluid formed mud cake, after mud cake comes off, rear to spray-hole 21 eject rear under jet action, can be suspended in annular space, prevent from depositing in pit shaft.While mud cake comes off, the acid solution jet that post-injection goes out can enter in the stratum around the borehole wall, and dredging near wellbore zone seepage channel, reaches the object of pickling de-plugging.While surface pump acid filling liquid, drag coiled tubing and move up, to realize acid solution being evenly arranged at interval of interest.
Fig. 8 is that in the inventive method, eddy flow acid dip pickle carries out next interval pickling effect schematic diagram, after pickling operation interval 10 pickling operation is completed, rapidly eddy flow acid dip pickle is moved to the end (bottom) of superposed pickling operation interval 9 by coiled tubing 6, the recovery speed of adjustment infusion discharge capacity and coiled tubing 6, repeat above-mentioned steps, until complete the pickling operation of whole pickling operation interval 9.When carrying out new interval pickling operation, when the pressure in annular space 13 is greater than strata pressure, certain acid amount also can enter into the blocking material removing hole or crack in last interval stratum, thus strengthens the flow conductivity on stratum.The acid amount entering stratum depends on pressure, reservoir properties and wellbore formation damage situation in well.
The rotating jet using the method to be formed, is conducive in pit shaft, produce annular space eddy flow field.Annular space circulation field can produce heteropical wall cross flow on the borehole wall, also impels the formation of annular space inner fluid tangential velocity thus and produces tangential forces.Drilling fluid mud cake on the borehole wall is first under the effect of jet radial impact power, there is fragmentation to a certain degree, then under the lateral shear effect of the tangential force produced by annular space eddy flow field, come off from the borehole wall, and rear under the effect of jet, be suspended in pit shaft.Relative to original acid washing method, the method contributes to increasing acid solution to the radial impact effect of the borehole wall, improves the seepage flow pressure reduction of acid solution, increases depth of interaction and the effect of acid solution, improves the permeability near wellbore stratum.In addition, the method also can increase the eroding velocity of acid solution in borehole wall surface, produces strong tangential shear action, contribute to the releasing of well bore face solid precipitation thing, improve near wellbore permeability further the drilling fluid mud cake on the borehole wall.
The present invention is when spraying pickle jet to a pickling operation interval, coiled tubing 6 reclaims with the recovery speed of regulation, drive eddy flow acid dip pickle to move upward, now shaft bottom can produce an annular space eddy flow field constantly moved up (representing with annular space eddy flow field streamline 12 in fig .9).Because eddy flow acid dip pickle does rotation movement around its axis, discontinuous jet impinging effect all can be subject to around the whole borehole wall, this discontinuous jet impingement function not only can strengthen pulverizing and the elimination effect of drilling fluid mud cake, also can contribute to acid solution and enter near wellbore zone, further enhancing pickling effect.
In addition, in acid cleaning process, because drilling fluid mud cake is constantly removed by solution, cause the well section that exposes more and more longer, in step 7 (after a certain well section pickling operation completes, down-hole rotary jet generator is moved to next well section end rapidly by coiled tubing, repeats above-mentioned steps, until complete the pickling operation of whole object section) suitably to increase the dragging speed of acid filling discharge capacity or reduction coiled tubing afterwards to ensure the acid intake amount on stratum.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.And it should be noted that, each ingredient of the present invention is not limited in above-mentioned overall applicability, the each technical characteristic described in manual of the present invention can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, the present invention covers other relevant with this case inventive point in the nature of things and combines and embody rule.
Claims (5)
1. remove the eddy flow acid washing method that Oil/gas Well near wellbore zone is polluted, it is characterized in that, described eddy flow acid washing method comprises:
1) according to reservoir characteristic and reservoir characteristics, pickling operation interval is determined;
2) by coiled tubing, the eddy flow acid dip pickle being connected to its underpart is needed the bottommost carrying out pickling operation interval in pit shaft, pickling operation is carried out step by step according to order from top to bottom; Wherein, described eddy flow acid dip pickle has the centralizer, Rotation Controllers, the spray gun that are connected successively from top to bottom, and the top of described eddy flow acid dip pickle is fixedly connected with coiled tubing by box cupling; Described spray gun can be connected with described Rotation Controllers rotationally, and described spray gun is hollow column, is cylinder in the middle part of it, the plane section cone anterior, rear portion is formed as tapered diameter respectively, and the front end of the plane section cone of front portion forms an internal taper hole; Sidewall is evenly equipped with multiple side direction spray-hole in the middle part of described spray gun, described side direction spray-hole is set for the eccentric, under action of a fluid described spray gun energy automatic rotation; Described spray gun rear portion is provided with backward spray-hole;
3) to pitching in described spray gun, the internal taper hole that this ball can close described spray gun front end forms one way valve;
4) in coiled tubing and annular space, pickle is injected;
5) when pickle enters eddy flow acid dip pickle, spray gun automatic rotation described in the jet propulsion sprayed by described side direction spray-hole, the eccentric jet impulse borehole wall simultaneously, produce non-homogeneous cross flow field, thus form annular space eddy flow field, under the effect of described annular space eddy flow field, the mud cake on the borehole wall is come off;
6) in the pickling operation process of each interval, reclaim described coiled tubing with the recovery speed specified, make described coiled tubing drive described eddy flow acid dip pickle to move up, until complete the pickling operation of this interval; Meanwhile, the sustained firing effect of the backward spray-hole mud cake that is conducive to deposit in suspension pit shaft and comes off;
7) when after the pickling operation completing an interval, by described coiled tubing, described eddy flow acid dip pickle is risen to the bottommost of next interval, repeat above-mentioned steps, until complete the pickling operation of whole pickling operation interval.
2. the eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute as claimed in claim 1, it is characterized in that, jet wherein a part of radial impact borehole wall of the described side direction spray-hole ejection of eccentric setting, make the cake crushing on the borehole wall, another part tangentially acts on the pickle in described annular space, form described annular space eddy flow field, under the effect of the tangential force of described annular space eddy flow field, broken described mud cake can come off from the borehole wall.
3. the eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute as claimed in claim 1 or 2, it is characterized in that, after described mud cake comes off, the radial jet that described side direction spray-hole continues in the pickle of ejection can enter in the stratum around the borehole wall, dredging near wellbore zone seepage channel, realizes pickling de-plugging.
4. the eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute as claimed in claim 3, it is characterized in that, when the pressure in annular space is greater than strata pressure, described pickle can infiltrate in stratum, remove the blocking material in hole or crack, strengthen the flow conductivity on stratum.
5. the eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute as claimed in claim 1 or 2, is characterized in that: the acid filling intensity in described pickle is at 0.1-0.3m
3between/m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m; The pickling liquid measure injected in described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than reservoir fracture pressure; Drag the speed of described coiled tubing between 1.0-2.0m/s.
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| CN104612651A (en) * | 2015-01-26 | 2015-05-13 | 中国石油天然气股份有限公司 | Acidification blockage relieving device and method for casing deformation screen pipe completion horizontal well |
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| CN112360370B (en) * | 2020-10-20 | 2021-12-07 | 中国石油大学(北京) | Rotary descaling and blockage removing device |
| CN112377149A (en) * | 2020-12-09 | 2021-02-19 | 中国石油天然气集团有限公司 | Method for determining acid strength for washing horizontal water injection well |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4349073A (en) * | 1980-10-07 | 1982-09-14 | Casper M. Zublin | Hydraulic jet well cleaning |
| CN2731085Y (en) * | 2004-01-05 | 2005-10-05 | 辽河石油勘探局 | Hydraulic self-feeding speed adjustable rotary sand flushing deblocking device |
| CN201218059Y (en) * | 2008-07-18 | 2009-04-08 | 大庆石油管理局 | High pressure nozzle of radial horizontal well |
| CN102434102A (en) * | 2011-11-14 | 2012-05-02 | 中国石油大学(北京) | Pulse cavitation multiple jet nozzle |
| CN202300346U (en) * | 2011-10-17 | 2012-07-04 | 中国石油化工股份有限公司 | Hydraulic blocking removal spraying stick for oil-water well |
| CN102562019A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Sand jet perforation annular mechanical packing multilayer fracturing tool pipe column and modification process |
-
2012
- 2012-12-24 CN CN201210567644.XA patent/CN103061712B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4349073A (en) * | 1980-10-07 | 1982-09-14 | Casper M. Zublin | Hydraulic jet well cleaning |
| CN2731085Y (en) * | 2004-01-05 | 2005-10-05 | 辽河石油勘探局 | Hydraulic self-feeding speed adjustable rotary sand flushing deblocking device |
| CN201218059Y (en) * | 2008-07-18 | 2009-04-08 | 大庆石油管理局 | High pressure nozzle of radial horizontal well |
| CN202300346U (en) * | 2011-10-17 | 2012-07-04 | 中国石油化工股份有限公司 | Hydraulic blocking removal spraying stick for oil-water well |
| CN102434102A (en) * | 2011-11-14 | 2012-05-02 | 中国石油大学(北京) | Pulse cavitation multiple jet nozzle |
| CN102562019A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Sand jet perforation annular mechanical packing multilayer fracturing tool pipe column and modification process |
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