CN103061712A - Rotary flow pickling method and device for removing contaminations in near-wellbore area of oil and gas well - Google Patents
Rotary flow pickling method and device for removing contaminations in near-wellbore area of oil and gas well Download PDFInfo
- Publication number
- CN103061712A CN103061712A CN201210567644XA CN201210567644A CN103061712A CN 103061712 A CN103061712 A CN 103061712A CN 201210567644X A CN201210567644X A CN 201210567644XA CN 201210567644 A CN201210567644 A CN 201210567644A CN 103061712 A CN103061712 A CN 103061712A
- Authority
- CN
- China
- Prior art keywords
- spray gun
- spray
- hole
- eddy flow
- pickling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The invention relate to a rotary flow pickling method and device, wherein the device comprises a centralizer, a rotation controller and a spray gun which are connected in a sequential mode. The spray gun is rotatingly connected with the rotation controller and is a hollow column, the middle of the spray gun is a cylinder, the front portion and the rear portion of the spray gun are both formed into gradually diameter-contracted cones with plane sections, and the front end of the front cone with the plane section forms an inner taper hole; the sidewall of the middle of the spray gun is evenly provided with a plurality of lateral spray-holes which are arranged eccentrically, and fluids can enable the spray gun to rotate automatically; a backward spray-hole is formed on the rear portion of the spray gun and can generate backward-sprayed flow which can help suspend deposits of a shaft and mud cakes dropped from well walls, so that deposition can be avoided. The rotary pickling method for removing contaminations in a near-wellbore area of a oil and gas well can not only enhance radial impact effects of pickling solutions to the well walls, improve transfusion pressure differentials of the pickling solutions, add effective depth of the pickling solutions and improve the effects of the pickling solutions, but also can improve the cleaning and suspending effects of the pickling solution to the deposits inside the shaft, and increase the permeability of stratums near to the shaft..
Description
Technical field
The present invention relates to oil gas field volume increase renovation technique field, especially a kind of rotating jet is combined with common pickling technology, realize removing eddy flow acid washing method and the acid dip pickle of Oil/gas Well near wellbore zone pollution.
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 that improves oil gas and final recovery ratio.But horizontal well contacts with reservoir owing to the long-time large tracts of land of working solution, its solid phase and liquid phase enter borehole wall stratum on every side, the pollution that is subject to and injury are also more serious, this will inevitably damage the stratum, form the pollution in wide area band, cause the near wellbore zone oil layer blocking, horizontal productivity descends, 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 the raising Oil ﹠ Gas Productivity.
In the last few years, because the length of horizontal segment constantly increases, not only the acid solution consumption was large to adopt traditional general cloth technic acid, and acid solution easily concentrates and consume in certain well section, was difficult to the uniform acid distribution of the full net horizontal section of realization.
But adopt general fixed point pickling operation, namely pass through the terminal fixedly downhole hardware realization of work string (normally coiled tubing) to the fixed point pickling of certain well section, although can realize the fixed point pickling operation of horizontal well, save the 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 on the borehole wall the tangential shear action of sour jet generation, can not form stronger shear action to the drilling fluid mud cake, affect the releasing of drilling fluid mud cake, so pickling effect is not very good.
Because the defective that known technology exists, the inventor is according to the Production design experience of being engaged in for many years this area and association area, develop eddy flow acid washing method and the acid dip pickle that pollute releasing Oil/gas Well of the present invention near wellbore zone, realization is to the fixed point pickling operation of net horizontal section, save the acid solution use amount, improved pickling de-plugging efficient.
Summary of the invention
The purpose of this invention is to provide a kind of eddy flow acid washing method and device that pollute the Oil/gas Well near wellbore zone of removing, to overcome known general cloth acid method and the conventional fixed point acid washing method problem that the pickling de-plugging exists in using in horizontal well, rotating jet and common acids washing method are combined the releasing efficient in the nearly well of the well of improving the standard contaminated zone.
For this reason, the present invention proposes a kind of 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 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, and its middle part is cylinder, the plane section cone anterior, that the rear portion forms respectively tapered diameter, and the front end of anterior plane section cone forms an internal taper hole; Be evenly equipped with a plurality of side direction spray-holes on the sidewall of described spray gun middle part, and described side direction spray-hole is set for the eccentric described spray gun energy automatic rotation under the effect of fluid; Described spray gun rear portion is provided with backward spray-hole, and the backward jet that the ejects mud cake that comes off on pit shaft deposit and the borehole wall that is conducive to suspend prevents that it from depositing in pit shaft.
Aforesaid eddy flow acid dip pickle, wherein, described spray gun sidewall is provided with a plurality of jetted layers, and each jetted layers is provided with 4-6 uniform described side direction spray-hole; The outlet internal diameter of described side direction spray-hole is 3-6mm, and its axis equates apart from the eccentric distance of described spray gun center line, for the 0.25-0.5 of spray gun internal diameter doubly.
Aforesaid eddy flow acid dip pickle, wherein, the angle between the tangent line at the axis of described side direction spray-hole and described lance outer surface intersection point place is 50-70 °.
Aforesaid eddy flow acid dip pickle, wherein, the parallel lines angle of the described spray gun center line of the axis of described side direction spray-hole is 60-80 °, and the ejiction opening of described side direction spray-hole tilts towards the rear portion of described spray gun.
Aforesaid eddy flow acid dip pickle, 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 outlet internal diameter 3-6mm, the axis of described backward spray-hole and the center line of described spray gun intersect, the angle that its shape is at 45 °-60 °, the ejiction opening direction of described backward spray-hole recedes, 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 that Oil/gas Well near-earth band pollutes of removing, and comprising:
1) according to reservoir characteristic and reservoir characteristics, determines pickling operation interval;
The aforesaid eddy flow acid dip pickle that 2) will be connected to its underpart by coiled tubing needs to carry out the bottommost of pickling operation interval in the pit shaft, and the pickling operation is carried out step by step according to order from top to bottom;
3) internal taper hole that pitching in the described spray gun, this ball can be sealed described spray gun front end consists of one way valve;
4) in coiled tubing and annular space, inject pickle;
5) when pickle enters the eddy flow acid dip pickle, jet by described side direction spray-hole ejection promotes described spray gun automatic rotation, the eccentric jet impulse borehole wall of while, produce non-homogeneous cross flow field, thereby form the 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 of stipulating, so that driving described eddy flow acid dip pickle, described coiled tubing moves up, until finish the pickling operation of this interval; Simultaneously, the mud cake that the sustained firing effect of backward spray-hole is conducive to suspend deposit in the pit shaft and comes off prevents that it from depositing in pit shaft;
7) after the pickling operation of finishing an interval, described rotation acid dip pickle is risen to the bottommost of next interval by described coiled tubing, repeat above-mentioned steps, until finish the pickling operation of whole pickling operation interval.
The eddy flow acid washing method that aforesaid releasing Oil/gas Well near-earth band pollutes, wherein, the jet of the described side direction spray-hole ejection of eccentric setting is a part of radial impact borehole wall wherein, make the cake crushing on the borehole wall, another part tangentially acts on the pickle in the 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 aforesaid releasing Oil/gas Well near-earth band pollutes, wherein, after described mud cake came off, the radial jet in the pickle that described side direction spray-hole continues to spray can enter in the borehole wall stratum on every side, dredging near wellbore zone seepage channel is realized the pickling de-plugging.
The eddy flow acid washing method that aforesaid releasing Oil/gas Well near-earth band pollutes, wherein, when the pressure in the annular space during greater than strata pressure, described pickle can infiltrate in the stratum, removes the obstruction material in hole or the crack, strengthens the flow conductivity on stratum.
The eddy flow acid washing method that aforesaid releasing Oil/gas Well near-earth band pollutes, wherein: the acid filling intensity in the described pickle is at 0.1-0.3m
3Between/the m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m; The pickling liquid measure of injecting in the described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than the reservoir fracture pressure; Drag the speed of described coiled tubing between 1.0-2.0m/s.
The multiply directed jet that the present invention sprays by eddy flow acid dip pickle side direction spray-hole, can in pit shaft, produce the annular space eddy flow field, because multiple jets all is to act on the pit shaft wall with certain inclination angle, be that the incident direction of jet and the normal direction of wall have certain angle, the distribution of the wall cross flow that therefore produces is heterogeneity, also impels thus the formation of annular space inner fluid tangential velocity and produces tangential forces.When using in open hole well, fragmentation to a certain degree at first under the effect of jet radial impact power, occurs in the drilling fluid mud cake on the borehole wall, then under the lateral shear effect of the tangential force that is produced by the annular space eddy flow field, comes off from the borehole wall.After mud cake came off, the acid solution jet that post-injection goes out can enter in the borehole wall stratum on every side, dredges the near wellbore zone seepage channel, reaches the purpose of pickling de-plugging.When annular space internal pressure during greater than strata pressure, a part of acid solution can also enter inside, stratum, removes the obstruction material in hole or the crack, strengthens the flow conductivity on stratum.In addition, backward spray-hole can carry out pit shaft with mud cake and the interior deposit of pit shaft that comes off.
Rotation acid washing method of the present invention has overcome traditionally general cloth technic acid and the generally limitation of fixed point cloth technic acid, and rotating jet technology and common Acidizing Technology are combined, and can improve to a great extent the pickling plugging removal effect of near wellbore zone.The present invention also takes full advantage of the incident direction of side direction jet in addition and the normal direction of wall has the formed annular space eddy flow field of non-homogeneous wall cross flow that certain angle produces, utilize the formed tangential velocity of this eddy flow field, changed conventional fixed point pickling jet to the mode of action of the borehole wall, when can produce the percussion of a side direction to the borehole wall, can also form certain lateral scouring effect to the borehole wall, be conducive to remove the mud cake that is attached on the borehole wall, improve plugging removal effect.Therefore, method of the present invention can not only increase pickle 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, can also strengthen acid solution to sedimental cleaning suspension effect in the pit shaft, thereby improve near the permeability on the stratum of pit shaft.
For general cloth technic acid, adopt device and method of the present invention can realize fixed point pickling operation to net horizontal section, save the acid solution use amount; For known fixed point is sprayed the pickling operation, the rotating jet that method of the present invention produces not only has stronger radial impact effect, also will produce stronger tangential impact effect, particularly for open hole well, can improve the releasing efficient of drilling fluid mud cake, strengthen plugging removal effect.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates 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 among Fig. 2 A;
Fig. 4 is the cross-sectional schematic along B-B line among Fig. 2 B;
Fig. 5 is the cross-sectional schematic along C-C line among Fig. 2 B;
Fig. 6 is the distribution schematic diagram that need to carry out interior each the pickling operation interval of oil well of eddy flow pickling operation;
Fig. 7 adopts eddy flow acid washing method of the present invention to schematic diagram that interval carries out the pickling operation in the Oil/gas Well;
Fig. 8 is the schematic diagram that adopts eddy flow acid washing method of the present invention that another interval in the Oil/gas Well is carried out the pickling operation;
Fig. 9 is the annular space eddy flow field schematic diagram that the present invention forms at the eddy flow acid cleaning process.
The drawing reference numeral explanation:
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, acid solution jet 11, jet 12, annular space eddy flow field streamline 13, annular space
The specific embodiment
A kind of eddy flow acid dip pickle that the present invention proposes has the centralizer, Rotation Controllers, the spray gun that are connected successively from top to bottom, and 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, and its middle part is cylinder, the plane section cone anterior, that the rear portion forms respectively tapered diameter, and the front end of anterior plane section cone forms an internal taper hole; Be evenly equipped with a plurality of side direction spray-holes on institute's spray gun middle part sidewall, described spray gun energy automatic rotation under the effect of fluid; Described spray gun rear portion is provided with backward spray-hole, to strengthen acid solution to the pit shaft deposit and from the come off cleaning performance that carries of mud cake of the borehole wall.
The present invention also proposes a kind of eddy flow acid washing method that Oil/gas Well near-earth band pollutes of removing, and comprising:
1) according to reservoir characteristic and reservoir characteristics, determines pickling operation interval;
The aforesaid eddy flow acid dip pickle that 2) will be connected to its underpart by coiled tubing needs to carry out the bottommost of pickling operation interval in the pit shaft, and the pickling operation is carried out step by step according to order from top to bottom;
3) internal taper hole that described spray gun front end is closed in pitching in the described spray gun, this ball sealing consists of one way valve;
4) in coiled tubing and annular space, inject pickle;
5) when pickle enters the eddy flow acid dip pickle, the jet that is sprayed by described side direction spray-hole promotes described spray gun automatic rotation, and the eccentric jet impulse borehole wall produces non-homogeneous cross flow field simultaneously, thereby forms the annular space eddy flow field; The pickle that described rotation pickling jet drives in the annular space forms the 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 of stipulating, so that driving described eddy flow acid dip pickle, described coiled tubing moves up, until finish the pickling operation of this interval; Simultaneously, the mud cake that the sustained firing effect of backward spray-hole is conducive to suspend deposit in the pit shaft and comes off prevents its deposition in pit shaft;
7) after the pickling operation of finishing an interval, described rotation acid dip pickle is risen to the bottommost of next interval by described coiled tubing, repeat above-mentioned steps, until finish the pickling operation of whole pickling operation interval.
The multiply directed jet that the present invention sprays by eddy flow acid dip pickle side direction spray-hole, can in pit shaft, produce the annular space eddy flow field, because multiple jets all is to act on the pit shaft wall with certain inclination angle, be that the incident direction of jet and the normal direction of wall have certain angle, the distribution of the wall cross flow that therefore produces is heterogeneity, also impels thus the formation of annular space inner fluid tangential velocity and produces tangential forces.When using in open hole well, fragmentation to a certain degree at first under the effect of jet radial impact power, occurs in the drilling fluid mud cake on the borehole wall, then under the lateral shear effect of the tangential force that is produced by the annular space eddy flow field, comes off from the borehole wall.After mud cake came off, the pickle jet that post-injection goes out can enter in the borehole wall stratum on every side, dredges the near wellbore zone seepage channel, reaches the purpose of pickling de-plugging.When annular space internal pressure during greater than strata pressure, a part of acid solution can also enter inside, stratum, removes the obstruction material in hole or the crack, strengthens the flow conductivity on stratum.In addition, the backward jet that backward spray-hole produces be conducive to the to suspend deposit in the pit shaft and the mud cake that comes off prevent its deposition in pit shaft.
Rotation acid washing method of the present invention has overcome traditionally general cloth technic acid and the generally limitation of fixed point cloth technic acid, and rotating jet technology and common Acidizing Technology are combined, and can improve to a great extent the pickling plugging removal effect of near wellbore zone.
For general cloth technic acid, adopt device and method of the present invention can realize fixed point pickling operation to net horizontal section, save the acid solution use amount; For known fixed point is sprayed the pickling operation, the rotating jet that method of the present invention produces not only has stronger radial impact effect, also will produce stronger tangential impact effect, particularly for open hole well, can improve the releasing efficient of drilling fluid mud cake.
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, below in conjunction with accompanying drawing and preferred embodiment, to the eddy flow acid washing method of releasing Oil/gas Well of the present invention near wellbore zone pollution and the specific embodiment, structure, feature and the effect of acid dip pickle, be described in detail as follows.In addition, by the explanation of the specific embodiment, when can being to reach technological means and the effect that predetermined purpose takes more to be goed deep into concrete understanding to the present invention, however institute's accompanying drawing only provide with reference to and explanation usefulness, the present invention is limited.
Such as Fig. 1, shown in Figure 4, eddy flow acid dip pickle 1 of the present invention has centralizer 4, Rotation Controllers 3, the spray gun 2 that is 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, its middle part is cylinder, the plane section cone anterior, that the rear portion forms respectively tapered diameter, and the front end of anterior plane section cone forms an internal taper hole 22; Be evenly equipped with a plurality of side direction spray-holes 20 on the sidewall of spray gun middle part, this side direction spray-hole 20 is set for the eccentric, and spray gun 2 can automatic rotation under the effect of fluid.The rear portion of spray gun 2 is provided with backward spray-hole 21, to strengthen acid solution to the pit shaft deposit and from the come off cleaning performance that carries of mud cake of the borehole wall.
A feasible technical scheme is, spray gun 2 is provided with a plurality of jetted layers, and shown in Fig. 1, Fig. 2 A, Fig. 2 B, each jetted layers is provided with 4-6 spray-hole 20, to increase projected area, improves pickling efficient.In order to increase the radial impact active force, can the self-resonating cavitating jet nozzle be installed at this spray-hole place simultaneously.In addition, the outlet internal diameter of described side direction spray-hole 20 is generally 3mm-6mm, and each side direction spray-hole 20 axis equates apart from the eccentric distance L of spray gun 2 center lines, for the 0.25-0.5 of spray gun internal diameter doubly.
In addition, please cooperate the A referring to Fig. 2, the angle α between the tangent line at the axis of side direction spray-hole 20 and spray gun 2 external surface intersection point places can be 50-70 °.
Further, as shown in Figure 3, because side direction spray-hole 20 is eccentric settings, the center line of the axis of spray-hole and spray gun 2 is also non-intersect, be generally 60-80 ° with the space angle β of center line, that is, the parallel lines angle of axis spray gun 2 center lines 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 nozzle 20 is arranged off-centre, its reaction force drives spray gun 2 automatic rotations, and side direction jet inclined impact forms the wall cross flow field of non-uniform Distribution in well bore face, and this is the major impetus that forms the annular space cyclonic effect.Pickle can eject the multiply directed jet after by spray-hole 20, produces rotation torque, and described spray gun can automatic rotation under the effect of fluid, thereby produces the pickle jet of rotation.
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 outlet internal diameter can be 3-6mm.The center line of the axis of backward spray-hole 21 and spray gun 2 intersects, the angle γ that structure is at 45 °-60 °, and the ejiction opening direction of described backward spray-hole 21 recedes, and the bus angle δ of its axis and spray gun 2 rear portion plane section cones is 70-90 °.In addition, in order to improve the application life of spray gun 2, usually described side direction spray-hole 20 and backward spray-hole 21 are carried out the resistance to acid attack processing.
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, and this Rotation Controllers 3 can adopt this area controller commonly used, for example damping due to rotation controller.
Please cooperate referring to Fig. 6 to Fig. 9, the eddy flow acid washing method that releasing Oil/gas Well near-earth band of the present invention pollutes comprises:
1) according to reservoir characteristic and reservoir characteristics, determines pickling operation interval, as having in the embodiment shown in fig. 6 three pickling operation intervals 8,9,10;
The described eddy flow acid dip pickle that 2) will be connected to its underpart by coiled tubing 6 needs to carry out the bottommost of one of them pickling operation interval of pickling operation in the pit shaft, and the pickling operation is carried out step by step according to order from top to bottom;
3) to spray gun 2 interior pitchings, the internal taper hole 22 that is arranged on the spray gun front portion consists of ball seat, and after pitching set, this ball can seal this internal taper hole 22 and consist of one way valve, pickle can not be flowed out by spray gun 2 bottoms, can only flow out from side direction nozzle 20 and the backward nozzle 21 of spray gun 2;
4) inject pickle to coiled tubing 6 and annular space 13;
5) when pickle enters the eddy flow acid dip pickle, promote spray gun 2 automatic rotations by the jet of side direction spray-hole 20 ejection of eccentric setting, the eccentric jet impulse borehole wall produces non-homogeneous cross flow field simultaneously, thereby at annular space 13 interior generations rotation pickling jets; The pickle that described rotation pickling jet drives in the annular space forms 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 came off, the acid solution jet that post-injection goes out can enter in the borehole wall stratum on every side, dredges the near wellbore zone seepage channel, reaches the purpose of pickling de-plugging;
6) in the pickling operation process of each interval, reclaim described coiled tubing 6 with the recovery speed of stipulating, so that driving described eddy flow acid dip pickle, described coiled tubing 6 moves up, until finish the pickling operation of this interval; Simultaneously, the sustained firing effect of backward spray-hole 21 mud cake that is conducive to suspend deposit in the pit shaft and comes off;
7) after the pickling operation of finishing an interval, described rotation acid dip pickle is risen to the bottommost of next interval by described coiled tubing 6, repeat above-mentioned steps, until finish the pickling operation of whole pickling operation interval.
Wherein, the jet part wherein of described side direction spray-hole 20 ejections of eccentric setting is the radial impact borehole wall, make the cake crushing on the borehole wall, another part then tangentially acts on the pickle in the 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, help broken described mud cake to come off from the borehole wall.
Further, after the mud cake on the borehole wall came off, the radial jet in the pickle that side direction spray-hole 20 continues to spray can be infiltrated in the borehole wall stratum on every side, removes the obstruction material in hole and the crack, realizes the pickling de-plugging; The backward jet that backward spray-hole 21 ejects can carry out pit shaft with mud cake and the pit shaft deposit that comes off, and realizes the abundant de-plugging of near wellbore zone.
In addition, when the pressure in the annular space 13 during greater than strata pressure, a part of pickle can infiltrate in the stratum, removes the obstruction material in hole or the crack, strengthens the flow conductivity on stratum.
In a specific embodiment, the acid filling intensity in the described pickle is at 0.1-0.3m
3Between/the m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m.
The pickling liquid measure of injecting in the described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than the reservoir fracture pressure.
Usually drag the speed of described coiled tubing 6 between 1.0-2.0m/s.
Further specify device and method of the present invention below in conjunction with accompanying drawing.Rotating jet mechanism of production of the present invention is: the eccentric jet generation rotation torque that the eccentric side of eddy flow acid dip pickle forms to spray-hole 20, drive the eddy flow acid dip pickle around its axis automatic rotation, thereby generation rotating jet, the eccentric jet impulse borehole wall of while, can produce non-homogeneous cross flow field, thereby form the annular space eddy flow field.The rotating speed of eddy flow acid dip pickle can be regulated by the Rotation Controllers 3 that is connected to spray gun 2 tops.Its specific implementation is: according to operational discharge capacity, the multilayer eccentric side can be set at the sidewall of spray gun 2 to spray-hole 20, can arrange 4-6 side direction spray-hole 20 such as every layer, the central vertical distance L of the axis of side direction spray-hole 20 and spray gun 2 is 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 outs and lance outer surface place is 50-70 °.Because side direction spray-hole 20 is eccentric settings, therefore the center line of the axis of side direction spray-hole 20 and spray gun 2 is also 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 tilted to the rear of spray gun 2, and the side direction jet that therefore produces also is to recede (to see Fig. 7-Fig. 9).Therefore high-speed jet 11 impacts on the borehole wall and can produce non-homogeneous cross flow field, i.e. most cross flow is done circumferential movement along the borehole wall, thereby forms eddy flow field in pit shaft.In addition, according to Newton's second law, the lateral eccentricity jet also can produce rotation torque to rotary spray gun 2, drives spray gun 2 around the axis automatic rotation of eddy flow acid dip pickle, produces rotating jet, and the rotating speed of device can be regulated by Rotation Controllers 3.Wherein, Rotation Controllers 3 can adopt general in the industry controller, such as the damping due to rotation controller.Centralizer 4 adopts sliding centralizer, be enclosed within on the device box cupling 5, because the internal diameter of centralizer 4 is slightly larger than box cupling 5 external diameters, and length is shorter, therefore can be movable within the specific limits, be that centralizer 4 can move up and down and rotates at box cupling, owing to being to adopt the conventional a kind of centralizer that uses in the fracture acidizing operation, repeat no more.Internal taper hole 22 in the spray gun bottom 1 consists of ball seat, and after pitching set, acid solution can not flow out from the spray gun bottom, can only be from side direction, backward spray-hole 20 and 21 ejections.
Before Specific construction, the well section of needs being carried out the pickling operation is divided into some pickling operation intervals 8,9,10, can be continuous between the adjacent interval, also can be discontinuous.The segmentation method of pickling operation interval is identical with the principle that conventional subsection acidizing adopts, each interval represents one and works alone the cycle, when each interval carries out the pickling operation, geological reservoir characteristics according to this interval are determined acid fluid system and construction parameter, the infusion discharge capacity of different well sections and coiled tubing reclaim speed can be identical also can be different, need to formulate according to the concrete condition of operation interval, this is routine techniques, repeats no more.Generally be along with the pickling operation is constantly carried out, the infusion discharge capacity is stepped to be increased progressively, and coiled tubing reclaims that speed is stepped successively decreases.
For example select acid fluid system take hydrochloric acid as main body for carbonate formation, select take mud acid or hydrofluoric acid as the main acid liquid system for sandstone reservoir, the acid solution specific category need to be determined according to the rock constituents of target zone with prescription.
Acid filling intensity is generally at 0.1-0.3m
3Between/the m, occurrence will require to determine according to degree of contamination and the transformation of reservoir; Acid filling can adopt coiled tubing 6 and 13 while of annular space injection mode to carry out, and 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 need to guarantee that bottom pressure is lower than the reservoir fracture pressure; The dragging speed of coiled tubing 6 need to be determined according to infusion discharge capacity, acid filling intensity and formation damage degree, generally between 1.0-1.2m/s.
As shown in Figure 7, when an interval is carried out the pickling operation, use coiled tubing 6 with terminal to predetermined well section under the eddy flow acid dip pickle, end such as pickling operation interval 10, after ground flow is ready, beginning is to coiled tubing 6 and annular space 13 interior infusion acid solutions, acid solution can form multiple jets 11 during by side direction spray-hole 20 ejection of eccentric setting on the 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 rotations, thereby in annular space 13, form as shown in Figure 9, by the eddy flow field of annular space eddy flow field streamline 12 expressions.Be ejected into acid solution on the borehole wall can remove mud cake that drilling fluid forms, after mud cake comes off, rear to spray-hole 21 eject rear under jet action, can be suspended in the annular space, prevent from pit shaft, depositing.When mud cake came off, the acid solution jet that post-injection goes out can enter in the borehole wall stratum on every side, dredges the near wellbore zone seepage channel, reaches the purpose of pickling de-plugging.In 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 the eddy flow acid dip pickle carries out next interval pickling effect schematic diagram in the inventive method, after 10 pickling operations are finished to pickling operation interval, rapidly the eddy flow acid dip pickle is moved to the end (bottom) of superposed pickling operation interval 9 by coiled tubing 6, adjust the recovery speed of infusion discharge capacity and coiled tubing 6, repeat above-mentioned steps, until finish the pickling operation of whole pickling operation interval 9.When carrying out new interval pickling operation, when the pressure in the annular space 13 during greater than strata pressure, certain acid amount also can enter into the obstruction material of removing hole or crack on last interval the stratum in, thus the flow conductivity on enhancing stratum.The acid amount that enters the stratum depends on pressure, reservoir properties and the wellbore formation damage situation that well is interior.
The rotating jet that uses the method to form is conducive to produce the annular space eddy flow field in pit shaft.The annular space circulation field can produce heteropical wall cross flow at the borehole wall, also impels thus the formation of annular space inner fluid tangential velocity and produces tangential forces.Drilling fluid mud cake on the borehole wall is at first under the effect of jet radial impact power, fragmentation to a certain degree occurs, and then under the lateral shear effect of the tangential force that is produced by the annular space eddy flow field, comes off from the borehole wall, and rear under the effect of jet, be suspended in the pit shaft.With respect to original acid washing method, the method helps to increase 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 near the permeability on the stratum of pit shaft.In addition, the method also can increase acid solution in the eroding velocity of borehole wall surface, and the drilling fluid mud cake on the borehole wall is produced strong tangential shear action, helps the releasing of well bore face solid precipitation thing, further improves near wellbore permeability.
The present invention is when spraying the pickle jet to a pickling operation interval, coiled tubing 6 reclaims with the recovery speed of regulation, drive the eddy flow acid dip pickle and move upward, this moment, the shaft bottom can produce an annular space eddy flow field that constantly moves up (representing with annular space eddy flow field streamline 12) in Fig. 9.Because the eddy flow acid dip pickle is to do rotation movement around its axis, all can be subject to discontinuous jet impinging effect around the whole borehole wall, this discontinuous jet impingement function and pulverizing and the removing effect that not only can strengthen the drilling fluid mud cake, also can help acid solution to enter the near wellbore zone, further strengthen pickling effect.
In addition, in acid cleaning process, because the drilling fluid mud cake constantly is disengaged, cause the well section that exposes more and more longer, in step 7 (after a certain well section pickling operation is finished, rapidly the down-hole rotary jet generator being moved to next well section by coiled tubing terminal, repeats above-mentioned steps, until finish the pickling operation of whole purpose section) dragging speed that will suitably increase afterwards the acid filling discharge capacity or reduce coiled tubing guarantees the acid intake amount on stratum.
The above only is the schematic specific embodiment of the present invention, is not to limit scope of the present invention.Any those skilled in the art, the equivalent variations of doing under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.And need to prove, each ingredient of the present invention is not limited in above-mentioned overall applicability, each technical characterictic of describing in the manual of the present invention can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, other combination relevant with this case inventive point and concrete the application have been contained in the present invention in the nature of things.
Claims (10)
1. an eddy flow acid dip pickle is characterized in that, described eddy flow acid dip pickle has centralizer, Rotation Controllers, the spray gun that is connected successively from top to bottom, and 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, and its middle part is cylinder, the plane section cone anterior, that the rear portion forms respectively tapered diameter, and the front end of anterior plane section cone forms an internal taper hole; Be evenly equipped with a plurality of side direction spray-holes on the sidewall of described spray gun middle part, described side direction spray-hole is set for the eccentric, described spray gun energy automatic rotation under the effect of fluid; Described spray gun rear portion is provided with backward spray-hole.
2. eddy flow acid dip pickle as claimed in claim 1 is characterized in that, described spray gun sidewall is provided with a plurality of jetted layers, and each jetted layers is provided with 4-6 uniform described side direction spray-hole; The outlet internal diameter of described side direction spray-hole is 3-6mm, and its axis equates apart from the eccentric distance of described spray gun center line, for the 0.25-0.5 of spray gun internal diameter doubly.
3. eddy flow acid dip pickle as claimed in claim 1 is characterized in that, the angle between the tangent line at the axis of described side direction spray-hole and described lance outer surface intersection point place is 50-70 °.
4. eddy flow acid dip pickle as claimed in claim 1 is characterized in that, the parallel lines angle of the described spray gun center line of the axis of described side direction spray-hole is 60-80 °, and the ejiction opening of described side direction spray-hole is to the rear portion inclination of described spray gun.
5. eddy flow acid dip pickle as claimed in claim 1, it is characterized in that, 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 outlet internal diameter 3-6mm, the axis of described backward spray-hole and the center line of described spray gun intersect, the angle that its shape is at 45 °-60 °, the ejiction opening direction of described backward spray-hole recedes, and the bus angle of its axis and described spray gun rear portion plane section cone is 70-90 °.
6. remove the eddy flow acid washing method that Oil/gas Well near-earth band pollutes for one kind, comprising:
1) according to reservoir characteristic and reservoir characteristics, determines pickling operation interval;
2) need to carry out the bottommost of pickling operation interval by what coiled tubing will be connected to its underpart in the pit shaft such as each described eddy flow acid dip pickle of claim 1 to 5, the pickling operation is carried out step by step according to order from top to bottom;
3) internal taper hole that pitching in the described spray gun, this ball can be sealed described spray gun front end consists of one way valve;
4) in coiled tubing and annular space, inject pickle;
5) when pickle enters the eddy flow acid dip pickle, jet by described side direction spray-hole ejection promotes described spray gun automatic rotation, the eccentric jet impulse borehole wall of while, produce non-homogeneous cross flow field, thereby form the 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 of stipulating, so that driving described eddy flow acid dip pickle, described coiled tubing moves up, until finish the pickling operation of this interval; Simultaneously, the sustained firing effect of the backward spray-hole mud cake that is conducive to suspend deposit in the pit shaft and comes off;
7) after the pickling operation of finishing an interval, described rotation acid dip pickle is risen to the bottommost of next interval by described coiled tubing, repeat above-mentioned steps, until finish the pickling operation of whole pickling operation interval.
7. the eddy flow acid washing method that pollutes of releasing Oil/gas Well near-earth band as claimed in claim 6, it is characterized in that, the jet of the described side direction spray-hole ejection of eccentric setting is a part of radial impact borehole wall wherein, make the cake crushing on the borehole wall, another part tangentially acts on the pickle in the 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.
8. the eddy flow acid washing method that pollutes such as claim 6 or 7 described releasing Oil/gas Well near-earth bands, it is characterized in that, after described mud cake comes off, radial jet in the pickle that described side direction spray-hole continues to spray can enter in the borehole wall stratum on every side, dredging near wellbore zone seepage channel is realized the pickling de-plugging.
9. the eddy flow acid washing method that pollutes such as claim 6 or 8 described releasing Oil/gas Well near-earth bands, it is characterized in that, when the pressure in the annular space during greater than strata pressure, described pickle can infiltrate in the stratum, remove the obstruction material in hole or the crack, strengthen the flow conductivity on stratum.
10. such as the eddy flow acid washing method of claim 6 or 7 described releasing Oil/gas Well near-earth bands pollutions, it is characterized in that: the acid filling intensity in the described pickle is at 0.1-0.3m
3Between/the m; Described coiled tubing discharge capacity is 0.16-0.48m
3/ m; The pickling liquid measure of injecting in the described annular space is the 60%-100% of oil pipe discharge capacity, and bottom pressure is lower than the reservoir fracture pressure; Drag the speed of described coiled tubing between 1.0-2.0m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210567644.XA CN103061712B (en) | 2012-12-24 | 2012-12-24 | A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210567644.XA CN103061712B (en) | 2012-12-24 | 2012-12-24 | A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103061712A true CN103061712A (en) | 2013-04-24 |
| CN103061712B CN103061712B (en) | 2016-01-27 |
Family
ID=48104570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210567644.XA Active CN103061712B (en) | 2012-12-24 | 2012-12-24 | A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103061712B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107013196A (en) * | 2017-06-09 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of method of horizontal well nitrogen foam homogeneous acidification |
| CN108979569A (en) * | 2018-07-02 | 2018-12-11 | 杰瑞能源服务有限公司 | A kind of method of three layers of de-plugging of fixed tubular column |
| CN110295859A (en) * | 2019-08-06 | 2019-10-01 | 成都阿斯贝瑞科技有限公司 | A kind of rotation well-flushing tool with fluid damping deceleration device |
| CN110778300A (en) * | 2019-10-14 | 2020-02-11 | 麦建宇 | Acidizing fracturing device for injecting high-molecular acidizing fracturing fluid into oil field stratum |
| CN112360370A (en) * | 2020-10-20 | 2021-02-12 | 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 |
| CN112412367A (en) * | 2019-08-20 | 2021-02-26 | 中国石油天然气股份有限公司 | Underground descaling device |
| CN113275306A (en) * | 2021-04-19 | 2021-08-20 | 龙岩市华研活性炭科技有限公司 | Dynamic rotational flow active carbon pickling machine |
| CN114075945A (en) * | 2020-08-12 | 2022-02-22 | 中国石油天然气股份有限公司 | Underground self-telescopic well wall cleaning structure and well wall cleaning method |
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 |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107013196A (en) * | 2017-06-09 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of method of horizontal well nitrogen foam homogeneous acidification |
| CN108979569A (en) * | 2018-07-02 | 2018-12-11 | 杰瑞能源服务有限公司 | A kind of method of three layers of de-plugging of fixed tubular column |
| CN110295859A (en) * | 2019-08-06 | 2019-10-01 | 成都阿斯贝瑞科技有限公司 | A kind of rotation well-flushing tool with fluid damping deceleration device |
| CN112412367A (en) * | 2019-08-20 | 2021-02-26 | 中国石油天然气股份有限公司 | Underground descaling device |
| CN110778300A (en) * | 2019-10-14 | 2020-02-11 | 麦建宇 | Acidizing fracturing device for injecting high-molecular acidizing fracturing fluid into oil field stratum |
| CN114075945A (en) * | 2020-08-12 | 2022-02-22 | 中国石油天然气股份有限公司 | Underground self-telescopic well wall cleaning structure and well wall cleaning method |
| CN114075945B (en) * | 2020-08-12 | 2023-06-30 | 中国石油天然气股份有限公司 | Downhole self-telescopic well wall cleaning structure and well wall cleaning method |
| CN112360370A (en) * | 2020-10-20 | 2021-02-12 | 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 |
| CN113275306A (en) * | 2021-04-19 | 2021-08-20 | 龙岩市华研活性炭科技有限公司 | Dynamic rotational flow active carbon pickling machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103061712B (en) | 2016-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103061712B (en) | A kind of eddy flow acid washing method removed Oil/gas Well near wellbore zone and pollute | |
| CN109653691B (en) | Hydraulic and mechanical compound controllable rock debris bed cleaning tool | |
| CN106437570A (en) | Drilling type continuous sand blasting device | |
| CN105604527B (en) | A kind of Archimedes's double helix shunting hydraulic ejector | |
| CN115992658B (en) | Multi-pass jet flow blocking removal oil extraction device and use method | |
| CN102094668A (en) | High-pressure hydraulic drilling, pressure releasing and protrusion removing method for upper drainage roadway | |
| CN206267815U (en) | Drilling type continuous sand flushing device | |
| CN104405311A (en) | High-efficiency self-adjustable hydraulic sand washing tool for horizontal well | |
| CN112227985B (en) | Ultra-deep salt mine butt-joint well bittern-mining full-horizontal-section groove expanding method | |
| CN106285606B (en) | A kind of double cluster hydraulic jetting fracturing tubing strings of rotatable nozzle-type and fracturing process | |
| CN109281628B (en) | Abrasive particle jet flow blockage removal and yield increase device for continuous oil pipe | |
| CN203175448U (en) | Rotary jet flow negative pressure suction composite blockage removal device | |
| CN205089245U (en) | Side direction efflux formula detritus bed removing tool | |
| CN107795282B (en) | Double control channel pulse jet ball tooth drill bit | |
| CN114893152A (en) | Mixed gas-water pulse jet flow blockage removing pipe column in sand control screen pipe | |
| CN204782851U (en) | Whirl sand removal device | |
| CN112709604B (en) | Device and method for removing residues and brine in salt cavern gas storage | |
| CN206352503U (en) | A kind of double cluster hydraulic jetting fracturing tubing strings of rotatable nozzle-type | |
| CN203783497U (en) | Fragment-cleaning tool for drillable bridge plug for oil-gas well | |
| CN101377124A (en) | Horizontal bare hole flow guiding slot well and method for mining coal bed gas of sugarcoated haw well | |
| CN104863534B (en) | Eddy flow fettling installation and method | |
| CN207905745U (en) | Sandstone geothermal well gas lift reverse circulation sand-flushing equipment | |
| CN112983325A (en) | Horizontal well blockage removal and yield increase integrated process and system | |
| CN104153730A (en) | Drilling tool for clearing borehole | |
| CN201982076U (en) | Jet-pressurizing combined high-efficiency sand blower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |