CN102182438A - Layered fracturing technology for variable-length graded sliding sleeve - Google Patents
Layered fracturing technology for variable-length graded sliding sleeve Download PDFInfo
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- CN102182438A CN102182438A CN2011101483354A CN201110148335A CN102182438A CN 102182438 A CN102182438 A CN 102182438A CN 2011101483354 A CN2011101483354 A CN 2011101483354A CN 201110148335 A CN201110148335 A CN 201110148335A CN 102182438 A CN102182438 A CN 102182438A
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Abstract
The invention discloses a layered fracturing technology for a variable-length graded sliding sleeve, which conducts layered fracturing by adopting a graded sleeve production technology of more than ten grades by changing the length of each grade of a sliding sleeve groove and a sliding sleeve plug valve tooth block under the condition that the diameter of a sliding sleeve plug valve of each grade of a variable-length graded sliding sleeve is unchanged. The variable-length graded sliding sleeve consists of a sliding sleeve plug valve and a sliding sleeve valve seat assembly, a movable tooth block is arranged on a body of the sliding sleeve plug valve, and two ends of the tooth block are respectively banded in the body by band springs; the sliding sleeve valve seat assembly consists of an upper joint, a stop screw, a seal ring, a jet hole, a shell, a shear pin and a sliding sleeve valve seat, wherein the sliding sleeve valve seat with a sliding sleeve groove on the inner wall is arranged in the shell and is fixed with the shell by the shear pin; and the tooth block corresponds to the sliding sleeve groove on the sliding sleeve valve seat.
Description
Technical field
The invention belongs to oil and gas industry, relate to a kind of classification sliding sleeve technology, particularly a kind of elongated degree classification sliding sleeve separate stratum fracfturing technology of fracturing technology substitutes the change stepped diameter sliding sleeve technology on the original operating tool string.
Background technology
In the middle of the machinery separate stratum fracfturing construction technology, a kind of fracturing without pulling string technology is arranged, that is: become the process of stepped diameter pressure break, behind the intact layer of every pressure, only need drop into the steel ball that diameter increases step by step successively, open the classification pressure break sliding sleeve of each layer position, after steel ball is blocked the lower passage of sliding sleeve from well head, fracturing sand liquid enters new layer position by the sliding sleeve outlet, carries out the continuous stratification pressure break.Its shortcoming is along with the horizontal segment of horizontal well is more and more longer, even reach 1000-2000 rice, and the length of each construction section of the process of change stepped diameter pressure break can not be above 100 meters, therefore, want one-trip string to carry out 10 grades of separate stratum fracfturings to more than 20 grades the time, because the internal diameter of tubing string is restricted, be 76mm to the maximum, the steel ball minimum diameter is 30mm, the minimum differential of each steel ball is 4mm, can only reach 10 grades at most at present, adopt the process that becomes the stepped diameter pressure break can not satisfy the requirement of horizontal well multistage fracturing construction technology technology.
Summary of the invention
The objective of the invention is: a kind of elongated degree classification sliding sleeve separate stratum fracfturing technology is provided, this technology is under the constant situation of the sliding sleeve plug valve diameter of elongated degree classification sliding sleeves at different levels, as long as change the length of every grade of sliding sleeve groove and sliding sleeve plug valve block teeth, just can realize classification more than the 10 grades cover technology of skidding, carry out separate stratum fracfturing.
Technical scheme of the present invention is: design a kind of elongated degree classification sliding sleeve separate stratum fracfturing technology, this technology is under the constant situation of the sliding sleeve plug valve diameter of elongated degree classification sliding sleeves at different levels, by changing the length of every grade of sliding sleeve groove and sliding sleeve plug valve block teeth, realize classification more than the 10 grades cover technology of skidding, carry out separate stratum fracfturing.
Described elongated degree classification sliding sleeve is made up of sliding sleeve plug valve and Valve with sliding bush seat assembly, and described sliding sleeve plug valve comprises: fishing head, stripper rubber, upper pressing cap, O RunddichtringO, spring, body, block teeth, steel ball, garter spring, mandrel, rubber cover plate; Mobilizable block teeth are arranged on body, the two ends of block teeth respectively by garter spring with its banding in body; Stripper rubber is integrated on upper pressing cap, and upper pressing cap and body one terminal filament link and connect, and its endoporus has the O RunddichtringO; Mandrel is arranged in the body, mandrel upper end screwed connection fishing head; One end of spring is arranged on the upper pressing cap, and the other end is arranged on the boss of mandrel, and spring housing is on mandrel; Mandrel is two bullets that link to each other with the corresponding partial shape of block teeth, its direction unanimity, and major part is facing to fishing head; There are two grooves the block teeth inboard, and bullet part of the corresponding mandrel of each groove is provided with steel ball between them; Described Valve with sliding bush seat assembly is made up of top connection, check screw, sealing ring, spray-hole, shell, shear pin, sliding sleeve valve seat, and by top connection screwed connection shell, shell has check screw and spray-hole and shear pin successively; The sealing ring I is arranged in the top connection; The sliding sleeve valve seat that inwall has the sliding sleeve groove is arranged in the shell, fixes by shear pin and shell; There are sealing ring II and sealing ring III in the two ends of described sliding sleeve valve seat; Described block teeth are corresponding with the sliding sleeve groove on the sliding sleeve valve seat.
Elongated degree classification sliding sleeve separate stratum fracfturing technology, concrete grammar is as follows:
1) according to the construction number of plies, determine the quantity of elongated degree classification sliding sleeve, its quantity lacks 1 than the construction number of plies, and the lower packet that connects on the tubing string is the hydraulic pressuring difference formula compression packer of Y344 structure; Be to carry out separate stratum fracfturing step by step from top to bottom during construction, and the length of the sliding sleeve plug valve of pumping must shorten step by step from long to weak point, and the length L of block teeth≤H sliding sleeve groove length; The sliding sleeve groove length H1 of the Valve with sliding bush seat assembly of each next stage is greater than the sliding sleeve groove length H2 of upper level, and the length L of the block teeth on the sliding sleeve plug valve also is the L2 of the length L 1 of each next stage greater than upper level;
2) described sliding sleeve plug valve is when free state, because the conical surface on its upper spring effect mandrel, the conical surface promotes steel ball again, and the axial force that spring is applied on the conical surface is converted into the radial load that steel ball promotes block teeth, block teeth will be protruding, and the external diameter of block teeth is greater than latus rectum in the pipe string at this moment; Be pulled outwardly out mandrel, the compression spring reset, block teeth withdraws under the effect of garter spring in the sliding sleeve plug valve body, this moment the sliding sleeve plug valve the internal diameter 3-4mm that gangs up less than pipe of maximum outside diameter, be placed in the tubing nipple at well head top pumping in pipe is gone here and there;
3) the sliding sleeve plug valve is under the pump action of liquid stream, when the sliding sleeve plug valve arrives the sliding sleeve groove of Valve with sliding bush seat assembly, when the length L of block teeth〉during the length of H groove, by this grade Valve with sliding bush seat assembly, operation downwards again; When running into next stage Valve with sliding bush seat assembly, when the length of the length L≤H groove of block teeth, block teeth eject under the effect of spring, embed the sliding sleeve groove, stop descending; Under the effect of pumped liquid stream, stripper rubber will set, and liquid is flowed shutoff on sliding sleeve plug valve top, form high pressure at an upper portion thereof, when pressure reaches 5-10MPa, shear pin will be cut off, sliding sleeve valve seat and sliding sleeve plug valve run down to the bottom of Valve with sliding bush seat assembly together; It is blocked in this place, stops descendingly, reach and open sliding sleeve, carry out the technological requirement of separate stratum fracfturing.
Described block teeth are 2-6, are the even cloth in axle center with the mandrel.
The width of described groove is identical with steel ball size.
Described sliding sleeve groove is the different specifications of a series of length with block teeth.
The material of described Valve with sliding bush seat assembly and sliding sleeve plug valve is high-intensity alloy steel.
Described high-intensity alloy steel is a chrome-moly steel.
Described fishing head material is a ductile iron.
The invention has the beneficial effects as follows: 1) under the constant situation of sliding sleeve plug valve diameters at different levels,, just can realize classification more than the 10 grades cover technology of skidding, carry out separate stratum fracfturing as long as change the length of every grade of sliding sleeve groove and block teeth.2) block teeth on the sliding sleeve plug valve have the parallel function of stretching out: the block teeth two ends have isodiametric steel ball to support, and the thickness of block teeth equates, make block teeth keeping parallelism each other when stretching out or shrink, block teeth can paste pipe string all the time inwall is parallel and move downward, and can not tilt because of block teeth, and be stuck on the box cupling of oil pipe, cause delivery not in place, make the construction in layer failure.3) lock function: when mandrel is descending, steel ball is in the maximum outside diameter place of mandrel, fishing head on the mandrel can be sitting on the upper pressing cap, stop that mandrel is or else descending, mandrel is fixed, sliding sleeve plug valve block teeth are no longer reclaimed, or else its external diameter changes, reach the effect of locking sliding sleeve plug valve external diameter, played reliable embeddeding action.4) cross the function that the reducing joint binds round: two taper surfaces are arranged on the mandrel of sliding sleeve plug valve, when steel ball is in position between the poppet surface top and bottom, in the time of just on the conical surface, the sliding sleeve plug valve can be under the pumping of liquid stream, by reducing joint hoop, its maximum gauge that can pass through is slightly less than the maximum outside diameter of sliding sleeve plug valve, and the minimum diameter that can pass through is slightly larger than the external diameter of the body of sliding sleeve plug valve, and its excursion is exactly the difference of mandrel maximum gauge and minimum diameter.5) anti-erosion function and brill mill function: the material of described Valve with sliding bush seat assembly and sliding sleeve plug valve is that high-intensity alloy steel can be prevented erosion; Fishing head adopts ductile iron to manufacture, and makes it have very high hardness, and has the mill of boring function.6) return row function, stratum, construction back has certain energy, when well head control open flow discharge capacity reaches 300-400L/min, can form bigger chock pressure difference in the bottom of sliding sleeve plug valve, can overcome the compressive force of spring, makes mandrel up, the block teeth retraction; And then make the sliding sleeve plug valve under the chock pressure difference effect that open flow forms, gone out outside the well by the liquid stream that the well internal return goes out.7) salvage function, make the compression elasticity of mandrel gram force spring up, thereby make steel ball enter the recessed thin place of mandrel, play the block teeth effect of retraction automatically.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples, but not as a limitation of the invention:
Fig. 1 becomes diameter sliding sleeve separate stratum fracfturing pipe string structure schematic diagram D2＜D1;
Fig. 2 is the Valve with sliding bush seat assembly structural principle key diagram of the embodiment of the invention;
Fig. 3 is that the sliding sleeve plug valve of the embodiment of the invention is when being in free state;
Fig. 4 is that the A of Fig. 3 sliding sleeve plug valve when being in free state is to cuing open figure;
Fig. 5 is that the sliding sleeve plug valve of the embodiment of the invention is when being in the pipe string pumping state;
Fig. 6 is that the A of Fig. 5 sliding sleeve plug valve when being in pumping state in the pipe string is to cuing open figure;
Fig. 7 is as L〉during H, the relation between sliding sleeve plug valve and the Valve with sliding bush seat assembly;
Fig. 8 is the input operating mode when L≤H;
Fig. 9 is that spray-hole 5 is opened operating mode;
Figure 10 is the elongated degree classification of embodiment of the invention sliding sleeve pipe string structure schematic diagram H2〉H1.
Among the figure, 1, top connection; 2, check screw; 3, sealing ring I; 4, sealing ring; 5, spray-hole; 6, shell; 7, shear pin; 8, sliding sleeve valve seat; 9, sliding sleeve groove; 10, sealing ring III; 11, fishing head; 12, stripper rubber; 13, upper pressing cap; 14, O RunddichtringO; 15, spring; 16, body; 17, block teeth; 18, groove; 19, steel ball; 20, garter spring; 21, mandrel; 22, rubber cover plate; 23, hydraulic anchor; 24, K344 packer; 25, diameter is the change stepped diameter sliding sleeve of D1; 26, go up two public ball seats; 27, diameter is the change stepped diameter sliding sleeve of D2; 28, following pair of public ball seat; 29, horn mouth; 30, construction position, upper strata; 31, construction position, middle level; 32, construction lower floor position; 33, elongated degree classification sliding sleeve II; 34, Y344 packer; 35, elongated degree classification sliding sleeve I; Wherein, the H among the figure is the length of sliding sleeve groove 9, and D is the sliding sleeve diameter; L is the length of block teeth 17.
The specific embodiment
The structure that is not described in detail in an embodiment, its structure is identical with existing known structure.
Fig. 1 is for becoming diameter sliding sleeve separate stratum fracfturing pipe string structure schematic diagram D2＜D1
As shown in Figure 1, construction layer divides construction position, upper strata 30, construction position, middle level 31; Construction lower floor position 32; Construction pipe string is to be connected in series in the following order: hydraulic anchor 23, K344 packer 24, diameter be D1 change stepped diameter sliding sleeve 25, K344 packer 24, go up two public ball seats 26, hydraulic anchor 23, diameter change stepped diameter sliding sleeve 27, K344 packer 24, following pair of public ball seat 28 into D2, end is a horn mouth 29.This construction pipe string is a kind of fracturing without pulling string technology, adopts to become stepped diameter sliding sleeve technology, and the sliding sleeve diameter of hydraulic anchor 23 every next stage is less than the sliding sleeve diameter of upper level, and the differential minimum of per two sliding sleeve internal diameters is 4mm, for 3
1/
2" oil pipe of internal diameter can be realized 10 grades separate stratum fracfturing construction at most.
Because of this process using K344 packer, packer sets layered effect when guaranteeing separate stratum fracfturing, behind the intact layer of every pressure, drop into the steel ball that diameter increases step by step successively from well head, open the classification pressure break sliding sleeve of each layer position after, steel ball will continue to move down into the bottom of each lower packet, after blocking the packer lower passage, make packer bear the inside and outside differential pressure on steel ball top, guarantee to set good, fracturing sand liquid enters new layer position by the sliding sleeve outlet, carries out the continuous stratification pressure break.
Embodiment 1
Elongated degree classification sliding sleeve separate stratum fracfturing technology is under the constant situation of the sliding sleeve plug valve diameter of elongated degree classification sliding sleeves at different levels, by changing the length of every grade of sliding sleeve groove 9 and sliding sleeve plug valve block teeth 17, realize classification more than the 10 grades cover technology of skidding, carry out separate stratum fracfturing.Described elongated degree classification sliding sleeve is made up of sliding sleeve plug valve and Valve with sliding bush seat assembly, described sliding sleeve plug valve comprises: fishing head 11, stripper rubber 12, upper pressing cap 13, O RunddichtringO 14, spring 15, body 16, block teeth 17, steel ball 19, garter spring 20, mandrel 21, rubber cover plate 22, mobilizable block teeth 17 are arranged on body 16, the two ends of block teeth 17 respectively by garter spring 20 with its banding in body 16; Stripper rubber 12 is integrated on upper pressing cap 13, and upper pressing cap 13 links with body 16 1 terminal filaments and connects, and its endoporus has O RunddichtringO 14; Mandrel 21 is arranged in the body 16, mandrel 21 upper ends screwed connection fishing head 11, and an end of spring 15 is arranged on the upper pressing cap 13, and the other end is arranged on the boss of mandrel 21, and the spring of spring 15 is enclosed within on the mandrel 21; Mandrel 21 is two bullets that link to each other with block teeth 17 corresponding partial shapes, its direction unanimity, and major part is facing to fishing head 11; There are two grooves 18 block teeth 17 inboards, and 21 1 bullet parts of each groove 18 corresponding mandrel are provided with steel ball 19 between them; Described Valve with sliding bush seat assembly is made up of top connection 1, check screw 2, sealing ring, spray-hole 5, shell 6, shear pin 7, sliding sleeve valve seat 8, and by top connection 1 screwed connection shell 6, shell 6 has check screw 2 and spray-hole 5 and shear pin 7 successively; Sealing ring I 3 is arranged in the top connection 1; The sliding sleeve valve seat 8 that inwall has sliding sleeve groove 9 is arranged in the shell 6, and is fixing with shell 6 by shear pin 7; There are sealing ring II 4 and sealing ring III 10 in the two ends of described sliding sleeve valve seat 8; Described block teeth 17 are corresponding with the sliding sleeve groove 9 on the sliding sleeve obturating plug 8.
Embodiment 2
Embodiment 2 and embodiment 1 are basic identical, and difference is: described elongated degree classification sliding sleeve separate stratum fracfturing technology, and concrete grammar is as follows:
1) according to the construction number of plies, determine the quantity of elongated degree classification sliding sleeve, its quantity lacks 1 than the construction number of plies, and the lower packet that connects on the tubing string is the hydraulic pressuring difference formula compression packer of Y344 structure; Be to carry out separate stratum fracfturing step by step from top to bottom during construction, and the length of the sliding sleeve plug valve of pumping must shorten step by step from long to weak point, and the length 17L of block teeth≤H sliding sleeve groove 9 length; The sliding sleeve groove length H1 of the Valve with sliding bush seat assembly of each next stage is greater than the sliding sleeve groove length H2 of upper level, and the length L of the block teeth 17 on the sliding sleeve plug valve also is the L2 of the length L 1 of each next stage greater than upper level;
2) described sliding sleeve plug valve is when free state, because the conical surface on its upper spring 5 effect mandrels 21, the conical surface promotes steel ball 19 again, the axial force that spring 5 is applied on the conical surface is converted into the radial load that steel ball 19 promotes block teeth 17, block teeth 17 will be protruding, and the external diameter of block teeth 17 is greater than latus rectum in the pipe string at this moment; Be pulled outwardly out mandrel 21, compression spring 5 resets, and block teeth 17 withdraws under the effect of garter spring 20 in the sliding sleeve plug valve body 16, this moment the sliding sleeve plug valve the internal diameter 3-4mm that gangs up less than pipe of maximum outside diameter, be placed in the tubing nipple at well head top pumping in pipe is gone here and there;
3) the sliding sleeve plug valve is under the pump action of liquid stream, when the sliding sleeve plug valve arrives sliding sleeve groove 9 places of Valve with sliding bush seat assembly, when the length L of block teeth 17〉during the length of H groove, by this grade Valve with sliding bush seat assembly, operation downwards again; When running into next stage Valve with sliding bush seat assembly, when the length of the length L≤H groove of block teeth 17, block teeth 17 eject under the effect of spring 5, embed sliding sleeve groove 9 places, stop descending; Under the effect of pumped liquid stream, stripper rubber 12 will set, and liquid is flowed shutoff on sliding sleeve plug valve top, form high pressure at an upper portion thereof, when pressure reaches 5-10MPa, shear pin 7 will be cut off, sliding sleeve valve seat 8 and sliding sleeve plug valve run down to the bottom of Valve with sliding bush seat assembly together; It is blocked in this place, stops descendingly, reach and open sliding sleeve, carry out the technological requirement of separate stratum fracfturing.
Embodiment 3
Basic identical with embodiment 2, difference is: described block teeth 17 are 6, and (2-6 all can) be that cloth is spared in the axle center with mandrel 21; Or the width of described groove 18 is identical with steel ball 19 diameters; Or described sliding sleeve groove 9 is the different specifications of a series of length with block teeth 17; Or the material of described Valve with sliding bush seat assembly and sliding sleeve plug valve is a chrome-moly steel; Or described fishing head 11 materials are ductile iron; Technology of the present invention can be one or more combination of above-mentioned feature.
Embodiment 4
Elongated degree classification sliding sleeve is made up of sliding sleeve plug valve and Valve with sliding bush seat assembly, as shown in Figure 2, the sleeve base assembly is made up of top connection 1, check screw 2, sealing ring, spray-hole 5, shell 6, shear pin 7, sliding sleeve valve seat 8, by top connection 1 screwed connection shell 6, shell 6 has check screw 2 and spray-hole 5 and shear pin 7 successively; Sealing ring I 3 is arranged in the top connection 1; The sliding sleeve valve seat 8 that inwall has sliding sleeve groove 9 is arranged in the shell 6, and is fixing with shell 6 by shear pin 7; There are sealing ring II 4 and sealing ring III 10 in the two ends of described sliding sleeve valve seat 8.
As shown in Figure 5, the sliding sleeve plug valve comprises: fishing head 11, stripper rubber 12, upper pressing cap 13, O RunddichtringO 14, spring 15, body 16, block teeth 17, steel ball 19, garter spring 20, mandrel 21, rubber cover plate 22, mobilizable block teeth 17 are arranged on body 16, the two ends of block teeth 17 respectively by garter spring 20 with its banding in body 16; Stripper rubber 12 is integrated on upper pressing cap 13, and upper pressing cap 13 links with body 16 1 terminal filaments and connects, and its endoporus has O RunddichtringO 14; Mandrel 21 is arranged in the body 16, mandrel 21 upper ends screwed connection fishing head 11, and an end of spring 15 is arranged on the upper pressing cap 13, and the other end is arranged on the boss of mandrel 21, and the spring of spring 15 is enclosed within on the mandrel 21; Mandrel 21 is two bullets that link to each other with block teeth 17 corresponding partial shapes, its direction unanimity, and major part is facing to fishing head 11; There are two grooves 18 block teeth 17 inboards, and 21 1 bullet parts of each groove 18 corresponding mandrel are provided with steel ball 19 between them.Described block teeth 17 are corresponding with the sliding sleeve groove 9 on the sliding sleeve valve seat 8.
Determine to be connected sliding sleeve number on the tubing string according to the interval number of pressing crack construction, the sum of its sliding sleeve lacks 1 than the sum of construction level.Determine the specification of sliding sleeve groove 9 and block teeth 17 according to the interval number of pressing crack construction, they can be the different specifications of a series of length.
Described block teeth 17 are 5, are the even cloth (Fig. 6) in axle center with mandrel 21; The width of described groove 18 is identical with steel ball 19 diameters; The material of described Valve with sliding bush seat assembly and sliding sleeve plug valve is a chrome-moly steel, also can be other high-intensity alloy steel; Described fishing head 11 materials are ductile iron.
As shown in Figure 3 and Figure 4, be in the sliding sleeve plug valve of free state, under the effect of axial force to mandrel 21 of spring 15, by the compressing of the taper surface on the mandrel 21 steel ball, mandrel 21 suffered axial forces are converted into steel ball 19 promote block teeth 17, the radial load that block teeth 17 are outwards protruded; Support because of there is steel ball 19 at the block teeth two ends, block teeth 17 can paste pipe string inwall all the time and move downward, and make keeping parallelism between the block teeth 17, can be, and be stuck on the box cupling of oil pipe because of block teeth 17 do not tilt, and cause and deliver not in placely, make the construction in layer failure.
As Fig. 5, shown in Figure 6, when being in the sliding sleeve plug valve and being in the pipe string pumping state, there is a corresponding sliding sleeve plug valve in the total Chengdu of sleeve bases at different levels, length L according to block teeth 17 on the sliding sleeve plug valve is corresponding with sliding sleeve groove 9 length H in the Valve with sliding bush seat assembly, have only when L≤H, block teeth 17 on the sliding sleeve plug valve could embed in the sliding sleeve groove 9 on the Valve with sliding bush seat assembly, play the effect of opening sliding sleeve valve seat 8.
Fig. 7 is for as L〉during H, relation between sliding sleeve plug valve and the Valve with sliding bush seat assembly, when L＞H, pumping sliding sleeve plug valve from pipe string, the cover switch separate stratum fracfturing of skidding is if the length L of block teeth 17 is during greater than the length of sliding sleeve groove 9, block teeth 17 can not embed sliding sleeve groove 9, can continue operation downwards by sliding sleeve groove 9, can pass through L smoothly the Valve with sliding bush seat assembly of H, move to next stage again.
Fig. 8 is the input operating mode when the L≤H, when pumping sliding sleeve plug was descending in pipe string, if when the length L of block teeth 17 is less than or equal to the length H of sliding sleeve groove 9, block teeth 17 could embed sliding sleeve groove 9, at this moment, can be under the effect of pumped liquid stream, stripper rubber 12 will set, and liquid is flowed shutoff in sliding sleeve portion beyond the Great Wall, form high pressure at an upper portion thereof, when pressure reaches 5-10MPa, pin will be cut off, sliding sleeve valve seat 8 and sliding sleeve plug valve run down to the bottom of Valve with sliding bush seat assembly together.
Fig. 9 opens operating mode for spray-hole 5, and open spray-hole this moment, and the sliding sleeve plug valve is blocked the bottom fluid course, and fracturing fluid is discharged from opened spray-hole 5, can carry out pressing crack construction to corresponding new interval.
Figure 10 is elongated degree classification sliding sleeve pipe string structure schematic diagram H2〉during H1, construction layer divides construction position, upper strata 30, construction position, middle level 31, construction lower floor position 32; Construction pipe string is to be connected in series in the following order: the Valve with sliding bush seat assembly of the Valve with sliding bush seat assembly of hydraulic anchor 23, K344 packer 24, elongated degree classification sliding sleeve II 33, Y344 packer 34, elongated degree classification sliding sleeve I 35, Y344 packer 34, end are horn mouth 29.
The sliding sleeve groove length of described elongated degree classification sliding sleeve II is H2, and the sliding sleeve groove length of elongated degree classification sliding sleeve I is H1.At first do not throw sliding sleeve and fill in the pressure break of row construction lower floor position 32; After this layer has been constructed, throw in the sliding sleeve plug valve of elongated degree classification sliding sleeve I, carry out the pressure break of construction layer position 31; Throw in the sliding sleeve plug valve of elongated degree classification sliding sleeve II again, the pressure break of the position, upper strata 30 of constructing; When remaining the separate stratum fracfturing of other layer, all be to throw in the sliding sleeve plug valve again after one deck has been constructed down, the length of the sliding sleeve plug valve of each pumping is all than the short 3-4mm of previous stage; Sliding sleeve groove length H at different levels are unequal, and every next stage sliding sleeve groove H is than the long 2-4mm of upper level, and sliding sleeve groove length at different levels from top to bottom are elongated step by step.Have only the packer of topmost to adopt conventional hydraulic anchor and K344 packer, below packers at different levels all adopt the Y344 packer.Repeat above step,, carry out separate stratum fracfturing all construction intervals.
After finish all construction layer positions, carry out closing well on request; Utilize the pressure in this well, discharge liquid in the well, the control discharge capacity reaches 300-400L/min, and the sliding sleeve plug valve is rushed out from the well internal return; When if the spray of sliding sleeve plug valve is not come out, can adopt the mode of salvaging, be lowered to fisher the sliding sleeve plug valve is salvaged, guarantee in the operating tool string unimpeded; When salvaging is not come out, adopt brill mill mode that the sliding sleeve plug is bored and grind off, guarantee that operating tool string is unimpeded.
Elongated degree classification sliding sleeve separate stratum fracfturing technology of the present invention is not limited only to the foregoing description, so long as under the constant situation of the sliding sleeve plug valve diameter of elongated degree classification sliding sleeves at different levels, by changing the length of every grade of sliding sleeve groove 9 and sliding sleeve plug valve block teeth 17, realize classification more than the 10 grades cover technology of skidding, the technology of carrying out separate stratum fracfturing all can.
Claims (9)
1. elongated degree classification sliding sleeve separate stratum fracfturing technology, it is characterized in that: this technology is under the constant situation of the sliding sleeve plug valve diameter of elongated degree classification sliding sleeves at different levels, by changing the length of every grade of sliding sleeve groove (9) and sliding sleeve plug valve block teeth (17), realize classification more than the 10 grades cover technology of skidding, carry out separate stratum fracfturing.
2. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 1, it is characterized in that described elongated degree classification sliding sleeve is made up of sliding sleeve plug valve and Valve with sliding bush seat assembly, described sliding sleeve plug valve comprises: fishing head (11), stripper rubber (12), upper pressing cap (13), O RunddichtringO (14), spring (15), body (16), block teeth (17), steel ball (19), garter spring (20), mandrel (21), rubber cover plate (22); Mobilizable block teeth (17) are arranged on body (16), the two ends of block teeth (17) respectively by garter spring (20) with its banding in body (16); Stripper rubber (12) is integrated on upper pressing cap (13), and upper pressing cap (13) links with body (16) one terminal filaments and connects, and its endoporus has O RunddichtringO (14); Mandrel (21) is arranged in the body (16), mandrel (21) upper end screwed connection fishing head (11); One end of spring (15) is arranged on the upper pressing cap (13), and the other end is arranged on the boss of mandrel (21), and spring (15) is enclosed within on the mandrel (21); Mandrel (21) is two bullets that link to each other with the corresponding partial shape of block teeth (17), its direction unanimity, and major part is facing to fishing head (11); There are two grooves (18) block teeth (17) inboard, and (21) bullet parts of the corresponding mandrel of each groove (18) are provided with steel ball (19) between them; Described Valve with sliding bush seat assembly is made up of top connection (1), check screw (2), sealing ring, spray-hole (5), shell (6), shear pin (7), sliding sleeve valve seat (8), by top connection (1) screwed connection shell (6), shell (6) has check screw (2) and spray-hole (5) and shear pin (7) successively; Sealing ring I (3) is arranged in the top connection (1); The sliding sleeve valve seat (8) that inwall has sliding sleeve groove (9) is arranged in the shell (6), and is fixing by shear pin (7) and shell (6); There are sealing ring II (4) and sealing ring III (10) in the two ends of described sliding sleeve valve seat (8); Described block teeth (17) are corresponding with the sliding sleeve groove (9) on the sliding plug valve seat (8).
3. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 1, concrete grammar is as follows:
1) according to the construction number of plies, determine the quantity of elongated degree classification sliding sleeve, its quantity lacks 1 than the construction number of plies, and the lower packet that connects on the tubing string is the hydraulic pressuring difference formula compression packer of Y344 structure; Be to carry out separate stratum fracfturing step by step from top to bottom during construction, and the length of the sliding sleeve plug valve of pumping must shorten step by step from long to weak point, and the length of block teeth (17) L≤H sliding sleeve groove (9) length; The sliding sleeve groove length H1 of the Valve with sliding bush seat assembly of each next stage is greater than the sliding sleeve groove length H2 of upper level, and the length L of the block teeth on the sliding sleeve plug valve (17) also is the L2 of the length L 1 of each next stage greater than upper level;
2) described sliding sleeve plug valve is when free state, because the conical surface on its upper spring (5) effect mandrel (21), the conical surface promotes steel ball (19) again, the axial force that spring (5) is applied on the conical surface is converted into the radial load that steel ball (19) promotes block teeth (17), block teeth (17) will be protruding, and the external diameter of block teeth this moment (17) is greater than latus rectum in the pipe string; Be pulled outwardly out mandrel (21), compression spring (5) resets, and block teeth (17) are withdrawn under the effect of garter spring (20) in the sliding sleeve plug valve body (16), at this moment the internal diameter 3-4mm that gangs up less than pipe of the maximum outside diameter of sliding sleeve plug valve, be placed in the tubing nipple at well head top pumping in the pipe string;
3) the sliding sleeve plug valve is under the pump action of liquid stream, and the sliding sleeve groove (9) that arrives the Valve with sliding bush seat assembly when the sliding sleeve plug valve is when locating, the length L when block teeth (17)〉during the length of H groove, by this grade Valve with sliding bush seat assembly, operation downwards again; When running into next stage Valve with sliding bush seat assembly, when the length of the length L≤H groove of block teeth (17), block teeth (17) eject under the effect of spring (5), embed sliding sleeve groove (9) and locate, and stop descending; Under the effect of pumped liquid stream, stripper rubber (12) will set, liquid is flowed shutoff on sliding sleeve plug valve top, form high pressure at an upper portion thereof, when pressure reaches 5-10MPa, shear pin (7) will be cut off, sliding sleeve valve seat (8) and sliding sleeve plug valve run down to the bottom of Valve with sliding bush seat assembly together; It is blocked in this place, stops descendingly, reach and open sliding sleeve, carry out the technological requirement of separate stratum fracfturing.
4. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 1 is characterized in that: described block teeth (17) are 2-6, are the even cloth in axle center with mandrel (21).
5. elongated degree classification sliding sleeve according to claim 2 is characterized in that: the width of described groove (18) is identical with steel ball (19) diameter.
6. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 1, it is characterized in that: described sliding sleeve groove (9) is the different specifications of a series of length with block teeth (17).
7. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 2, it is characterized in that: the material of described Valve with sliding bush seat assembly and sliding sleeve plug valve is high-intensity alloy steel.
8. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 7, it is characterized in that: described high-intensity alloy steel is a chrome-moly steel.
9. elongated degree classification sliding sleeve separate stratum fracfturing technology according to claim 2, it is characterized in that: described fishing head (11) material is a ductile iron.
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| CN 201110148335 CN102182438B (en) | 2011-06-03 | 2011-06-03 | Layered fracturing technology for variable-length graded sliding sleeve |
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| CN 201110148335 CN102182438B (en) | 2011-06-03 | 2011-06-03 | Layered fracturing technology for variable-length graded sliding sleeve |
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Effective date of registration: 20211014 Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co. Address before: 710018 room 1207, Changqing building, Changqing Xing Long Yuan District, Xi'an, Shaanxi Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. |
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