CN201991483U - Pipe column structure suitable for laminated sand fracturing of packer - Google Patents

Pipe column structure suitable for laminated sand fracturing of packer Download PDF

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Publication number
CN201991483U
CN201991483U CN2011200498786U CN201120049878U CN201991483U CN 201991483 U CN201991483 U CN 201991483U CN 2011200498786 U CN2011200498786 U CN 2011200498786U CN 201120049878 U CN201120049878 U CN 201120049878U CN 201991483 U CN201991483 U CN 201991483U
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CN
China
Prior art keywords
oil pipe
sliding sleeve
packer
tubing string
safety joint
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Expired - Lifetime
Application number
CN2011200498786U
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Chinese (zh)
Inventor
付建华
曾祥春
雷明
陈友斌
骆进
陈雪松
陈国庆
陈良英
王春生
黎自刚
杨芳
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CNPC Chuanqing Drilling Engineering Co Ltd
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CNPC Chuanqing Drilling Engineering Co Ltd
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Priority to CN2011200498786U priority Critical patent/CN201991483U/en
Application granted granted Critical
Publication of CN201991483U publication Critical patent/CN201991483U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a pipe column structure suitable for laminated sand fracturing of a packer, which relates to the technical field of jam release and salvage in the underground well work-over operation engineering of a petroleum gas well. A pipe column is connected with an upper oil pipe, a circulating sliding bush, a safety joint, an upper hydraulic anchor, an upper packer, a middle oil pipe, a sand spray sliding bush, an oil pipe, a ball seat, a lower hydraulic anchor, a lower packer, a lower oil pipe and a seat packing sliding bush from top to bottom. By adopting the pipe column structure, the complex construction process for inverse salvage of an upper pipe column on a left-hand drilling tool can be avoided. The pipe column structure has the characteristics of reducing construction steps and saving salvage time.

Description

Be applicable to the tubular column structure of packer layering sand fracturing
Technical field:A kind of tubular column structure that is applicable to packer layering sand fracturing is used for the construction of the oil gas well packer layering sand fracturing of oil gas field, relates to unfreezing fishing technical field in the down-hole workover treatment engineering of petroleum and natural gas well.
Background technology:In existing oil gas well, a bite oil gas well has several reservoirs usually, and each reservoir has two or more of reservoir hydrocarbon intervals, for each of reservoir hydrocarbon interval of reservoir is carried out separate zone stimulation, improve the production capacity of each of reservoir hydrocarbon interval, adopting the form of construction work of layering sand fracturing, is the technology that extensively applies to oilfield prospecting developing; In the construction of implementing the layering sand fracturing, packer separate stratum fracfturing technology is that the most frequently used a kind of layering adds sand technology, this technology mainly is to rely on packer and down-hole control tool, successively to each interval of interest sand fracturing, realize the construction of layering sand fracturing from bottom to top, adopt this technology, once construction can be finished two-layer or two-layer above sand fracturing, it is accurate to have layering, and therefore the high characteristics of construction success rate are widely used.
The two-layer packer separate stratum fracfturing tubular column structure of a typical sand fracturing is followed successively by from bottom to top: packer setting sliding sleeve, oil pipe, layer separating packer, hydraulic anchor, ball seat, oil pipe, sandblast sliding sleeve, oil pipe, top packer, hydraulic anchor, safety joint, circulation sliding sleeve.A sand fracturing is three layers if desired, will one group of ball seat of corresponding increase on packer layering sand fracturing tubing string, sandblast sliding sleeve, packer and hydraulic anchor; The rest may be inferred for the structure of the packer layering sand fracturing tubing string of a sand fracturing more than four layers or four layers.
After layering sand fracturing construction finishes, fracturing fluid need be discharged ground from the stratum, after discharge opeing finishes, if the oil gas well yield is low, still can not go into operation, at this moment, usually need seal the reservoir of pressure break, the reservoir on exploitation top, carrying out this work just needs kill-job, trips out the separate stratum fracfturing tubing string of down-hole then; But, behind pressing crack construction in the process of discharge opeing, some sands can be discharged the stratum along with fracturing fluid, these sand parts are discharged well head with fracturing fluid, part sand can be deposited on downwards on the layer separating packer, layer separating packer is buried by sand, cause the bit freezing of separate stratum fracfturing tubing string, behind the separate stratum fracfturing tubing string bit freezing, just can not trip out tubing string, in this case, if exploitation top reservoir, will implement the work of unfreezing, the separate stratum fracfturing tubing string on the following 30m in boundary at the bottom of the reservoir of top is taken out in unfreezing at least, make the top reservoir at the bottom of the following 30m in boundary do not have foreign material.
In the prior art, the method for taking out the above tubing string of stuck point is: adopt known technologies such as cumulative cutting or chemical cleavage, the oil pipe of tubing string top near stuck point cut off, trip out the top tubing string then; The shortcoming of prior art is: will implement kill-job before unfreezing, and kill job at first will be from pitching in the oil pipe, open the circulation sliding sleeve, after the circulation sliding sleeve is opened, steel ball still can be stayed in the circulation sliding sleeve, therefore cumulative cutting tool or chemical cleavage instrument all can not also just can not cut the tubing string of circulation sliding sleeve bottom by the circulation sliding sleeve; In order to propose the pipe string, can throw off from safety joint, still, to throw off and the top connection and the top tubing string thereof of safety joint can only be tripped out smoothly from safety joint, the lower contact of safety joint and bottom tubing string still link together and can not take out; In addition, because the lower contact of safety joint is a left hand thread, and the screw thread of oil pipe is a right-handed thread, and both thread rotary orientations are opposite, and are thin buttons, therefore are difficult to realize the make-up operation.For above-mentioned reasons, after adding the sandpipe post and being blocked, conventional unfreezing step is: 1. just changeing tubing string, safety joint top connection and lower contact are thrown off; 2. adopt progressively back-off of the left-handed fishing tool of left-handed drilling tool band, take out the top tubing string, because all being dextrorotation tubing round thread, the bottom tubing string connects, therefore, when implementing left-handed back-off, the tubing string of bottom will bear left-handed moment of torsion, can cause above each junction button of tubing string of stuck point all might to be dismantled, the method of back-off unfreezing needs repeatedly construction like this, so efficient is low, and duty cycle is long.
Summary of the invention:The purpose of this utility model is at the deficiencies in the prior art, has designed a kind ofly can remove circulation sliding sleeve and steel ball earlier, cuts the tubular column structure that is applicable to packer layering sand fracturing of oil pipe again.
The present invention is achieved in that
The utility model comprises connection tubing string and packing circulating device, it is characterized in that: connect tubing string and be made of top oil pipe 1, middle oil pipe 6 and bottom oil pipe 13, the packing circulating device comprises circulation sliding sleeve 2, safety joint 3, last hydraulic anchor 4, upper packer 5, sandblast sliding sleeve 7, ball seat 10, following hydraulic anchor 11, lower packet 12 and sets sliding sleeve 14;
The connection of described tubing string is from top to bottom: top oil pipe 1, circulation sliding sleeve 2, safety joint 3, go up hydraulic anchor 4, upper packer 5, middle oil pipe 6, sandblast sliding sleeve 7, oil pipe 8, ball seat 10, hydraulic anchor 11, lower packet 12, bottom oil pipe 13 and set sliding sleeve 14 down;
Described top oil pipe, middle oil pipe and bottom oil pipe 1,6 and 8 are connected circulation sliding sleeve 2, safety joint 3, last hydraulic anchor 4, upper packer 5, lower packet 12, sandblast sliding sleeve 7, following hydraulic anchor 11 respectively and set sliding sleeve 14.
Advantage of the present utility model and beneficial effect are: the dextrorotation box thread that adopts the dextrorotation male thread attachment security joint top connection of tubing string lower end, left-handed male thread with safety joint top connection lower end is connected with the left-handed box thread of safety joint lower contact upper end then, realization is connected with down-hole string, survey stuck point again, and then from cutting oil pipe more than the stuck point, this salvaging step can be avoided the left-hand thread drilling tool is implemented the construction that back-off is salvaged the top tubing string, can reduce the step of construction, save the salvaging time, therefore the utility model needle set has compliance strong, unfreezing efficient height, the characteristics that operating cost is low.
Description of drawings:
Fig. 1 is the two-layer packer layering sand fracturing tubing string connection diagram of a sand fracturing.
Fig. 2 is the enlarged diagram of safety joint 3 among Fig. 1.
Fig. 3 is the enlarged diagram of circulation sliding sleeve 2 among Fig. 1.
The specific embodiment:
Provide embodiments of the invention below in conjunction with accompanying drawing.
Embodiment 1
Connection of the present invention:
Once be lowered to enforcement, realize that the two-layer separate stratum fracfturing tubing string of pressure break is an example, the connection of tubing string from top to bottom among the present invention: top oil pipe 1, circulation sliding sleeve 2, safety joint 3, go up hydraulic anchor 4, upper packer 5, middle oil pipe 6, sandblast sliding sleeve 7, oil pipe 8, ball seat 10, hydraulic anchor 11, lower packet 12, bottom oil pipe 13 and set sliding sleeve 14 down; Top oil pipe, middle oil pipe and bottom oil pipe 1,6 and 8 are used to be connected circulation sliding sleeve 2, safety joint 3, last hydraulic anchor 4, upper packer 5, lower packet 12, sandblast sliding sleeve 7, following hydraulic anchor 11 and set sliding sleeve 14; The various tool that connects be for packing reservoir 16 and reservoir 17 to realize the layering sand fracturing; The effect of upper packer 5 is to separate oil pipe and sleeve pipe, and the oil pipe inner high voltage can be passed in the upper sleeve, so that the above sleeve pipe in protection upper packer 5 setting positions; Upper and lower hydraulic anchor 4 and 11 is used for the grappling oil pipe, prevents that tubing string moves in the fracturing process; Set and to open after sliding sleeve 14 pitchings build the pressure, be used to start hydraulic anchor 4, upper packer 5, following hydraulic anchor 11 and lower packet 12, set sliding sleeve 14 and open the sand fracturing passage that the back forms reservoirs 17; Sandblast sliding sleeve 7 can be realized the unlatching of passage after pitching builds the pressure, after sandblast sliding sleeve 7 was opened, steel ball was seated on the ball seat 10 and forms ball-and-seat, forms the sand fracturing passage to reservoir 16; The safety joint 3 that is provided with has top connection 18 and lower contact 19, and the dextrorotation tubing string can make tubing string from disengagement between the top connection 18 of safety joint 3 and the lower contact 19 when tubing string is blocked; Circulation sliding sleeve 3 can be implemented to drop into steel ball before the kill-job in oil pipe, builds the pressure and opens, and the passage between ditch oil pipe and the sleeve pipe realizes setting up the purpose of circulation; Set the steel ball of sliding sleeve 14, sandblast sliding sleeve 7 and circulation sliding sleeve 3 each self-configuring respective diameters, the diameter of steel ball increases step by step.
Embodiment 2
The course of work of the present invention is divided into five steps:
The first step is thrown off safety joint:
Elder generation's upper lifting pipe post, the pulling force that the well head oil pipe is born equals safety joint whole aerial weight of tubing string more than 3, safety joint 3 is placed the point of neutralization, this is after being blocked because of tubing string, the above tubing string of stuck point does not bear buoyancy, do like this and can make safety joint 3 neither be subjected to tensile load, do not load by compression yet, be beneficial to moment of torsion and be passed to safety joint 3, because having only the top connection 18 of safety joint 3 in whole sand fracturing tubing strings is that the laevorotatory oil gas thread is connected with lower contact 19, so, finish safety joint 3 placed the point of neutralization after, with regard to the dextrorotation tubing string, make between the top connection 18 of safety joint 3 and the lower contact 19 and throw off, when moment of torsion reduces suddenly, when suspending weight also reduces suddenly because tubing string is subjected to buoyancy, just finished the step of throwing off safety joint 3;
Heavy lower tubular column of second step:
The tubing string of top connection more than 18 of the first step being finished the safety joint 3 of disengagement proposes pit shaft, the down-hole is stayed in the lower contact 19 of safety joint 3, shed the circulation sliding sleeve 2 of tubing string lower end then on ground, top connection 18 with safety joint 3 is connected oil pipe bottom then, tighten tubing string per pass connecting thread according to the maximum value of recommending the torque wrench moment value again, the top tubing string moves back the risk of button in the time of can reducing laevorotatory oil tubing string make-up like this, and then with the tubing string G.I.H;
The 3rd step down-hole make-up:
When the top connection 18 of the second tubing string safety joint 3 bottom that be lowered to once more of step during apart from the lower contact 19 upper end 2m of downhole safety joint 3, adopt the circulation of 6~8L/s discharge capacity turn on pump, after circulation is normal, record suspending weight and pump pressure; Continue turn on pump then and slowly transfer tubing string, when transferring tubing string suspending weight is dropped in 5~10KN, implement the fish finding top, and the top connection 18 of safety joint 3 is inserted in the lower contact 19 of safety joint 3, realize the fish that goes into of safety joint; In going into the process of fish, if suspending weight descends, pump pressure rises, just fish is gone in expression smoothly, termination of pumping immediately to be on the safe side, repeats above operation, after confirming to go into fish, with rotating speed 5~15RPM laevorotatory oil tubing string make-up, in make-up, keep the pressure of the drill in 5~10KN, slowly transfer tubing string, and left-handed 10~15 circles are realized the tubing string make-up; The purpose of doing like this is: because suspending weight will slowly increase in the make-up process, it is little that less axial compression is born in the lower contact 18 of doing the top connection 17 that can make safety joint 3 and safety joint 3 like this, reduce the make-up resistance, can also reduce the risk that the top tubing string moves back button, also be convenient to observe simultaneously make-up and show; After make-up was finished, the upper lifting pipe post made safety joint 3 bear 100~300KN pulling force, check make-up situation;
The 4th pacing examination stuck point:
After finishing tubing string butt joint, in oil pipe, be lowered to sticking point instrument, stuck point implemented electrical measurement, record stuck point after, trip out the sticking point instrument device, finish the job step of test stuck point;
Because in the discharge opeing process after the layering sand fracturing, liquid is from setting sliding sleeve 14 and sandblast sliding sleeve 7 enters oil pipe, flow to well head from oil pipe again and discharge ground, mobile by boundary at the bottom of the fractured layer to not having between the layer separating packer, so, implement one time running string, realize in the two-layer separate stratum fracfturing tubing string of pressure break, to between the sandblast sliding sleeve 7 sand setting 9 appears easily at lower packet 12, so the stuck point position is usually at the sandblast sliding sleeve below 7, generally speaking, the circle, the end of top reservoir 15 apart from the distance of sandblast sliding sleeve 7 greater than 30m, so, cut oil pipes 6 near sandblast sliding sleeve 7 at the sandblast sliding sleeve more than 7, take out the needs that the top tubing string just can satisfy exploitation top reservoir 15;
The 5th step cutting oil pipe, take out the top tubing string:
After finishing the work of test stuck point, take out sticking point instrument, be lowered to the middle part of cutting tool then to first oil pipe more than the stuck point that records, with known technology cutting oil pipes such as cumulative cutting or chemical cleavage, trip out the cable and the cutting tool that connect cutting tool then, recur out the top of being cut off adds the tubing string of sand, finishes the task of unfreezing;
Embodiment 3
Once construction divides the enforcement of two-layer sand fracturing:
Sand fracturing purpose reservoir is 17,16, penetrates out; During pressing crack construction, at first inject fracturing fluid from oil pipe 1, after fracturing fluid is full of whole tubing string, throw first steel ball earlier and continue to inject fracturing fluid, first steel ball is seated at when setting sliding sleeve 14, the oil pipe internal pressure constantly raises, under pressure, lower packet 12 and upper packer 5 set simultaneously, upper and lower hydraulic anchor 4 and 11 is anchored on the sleeve pipe simultaneously, continues to inject fracturing fluid, and the oil pipe internal pressure continues to raise and opens until setting sliding sleeve 14, the fracturing fluid of Zhu Ruing just only enters reservoir 17 like this, realizes reservoir 17 sand fracturings.After reservoir 17 constructions finish, drop into second steel ball, open sandblast sliding sleeve 7, back second steel ball of sandblast sliding sleeve 7 unlatchings is seated on the ball seat 10 and forms ball-and-seat, because lower packet 12 has stoped fracturing fluid to enter reservoir 17, the fracturing fluid that oil pipe injects can only enter reservoir 16 by sandblast sliding sleeve 7, thereby realizes reservoir 16 sand fracturings.After layering added sand construction end, the fracturing fluid that progressively will enter the stratum that can drive a well was discharged ground, because the needs of SAND FRACTURING TECHNOLOGY, lower packet 12 and upper packer 5 are in the state of setting all the time in sand fracturing, discharge opeing and manufacturing process.
Embodiment 4
The structure of safety joint and circulation sliding sleeve and purposes:
Safety joint 3 is made up of top connection 18 and lower contact 19, the upper end of the top connection 18 of safety joint 3 is provided with the dextrorotation box thread, can realize and being connected of top tubing string, the lower end is provided with left-handed male thread, realization is connected with lower contact 19, and the upper end of lower contact 19 is provided with left-handed box thread, is connected with the left-handed male thread of top connection 18 lower ends, the lower end of lower contact 19 is provided with the dextrorotation male thread, and realization is connected with the bottom tubing string.
Circulation port 22, steel ball 23, shear pin 20, sliding sleeve 21 are set on sandblast sliding sleeve 7; Sandblast sliding sleeve 7 is provided with for the kill-job arts demand, the kill job program is: drop into steel ball 23 earlier in oil pipe 1, steel ball 23 is sitting on the sliding sleeve 21, build the pressure from oil pipe, cut off shear pin 20, sliding sleeve 21 is descending, and circulation port 22 is opened, ditch oil pipe and sleeve pipe inject well killing fluid from oil pipe then and implement kill-job.

Claims (2)

1. tubular column structure that is applicable to packer layering sand fracturing, comprise and connect tubing string and packing circulating device, it is characterized in that: connect tubing string and be made of top oil pipe, middle oil pipe and bottom oil pipe, the packing circulating device comprises circulation sliding sleeve, safety joint, last hydraulic anchor, upper packer, sandblast sliding sleeve, ball seat, following hydraulic anchor, lower packet and sets sliding sleeve;
The connection of described tubing string is from top to bottom: top oil pipe, circulation sliding sleeve, safety joint, go up hydraulic anchor, upper packer, middle oil pipe, sandblast sliding sleeve, oil pipe, ball seat, hydraulic anchor, lower packet, bottom oil pipe and set sliding sleeve down.
2. the tubular column structure that is applicable to packer layering sand fracturing according to claim 1 is characterized in that: described top oil pipe, middle oil pipe and bottom oil pipe are connected circulation sliding sleeve, safety joint, last hydraulic anchor, upper packer, lower packet, sandblast sliding sleeve, following hydraulic anchor respectively and set sliding sleeve.
CN2011200498786U 2011-02-28 2011-02-28 Pipe column structure suitable for laminated sand fracturing of packer Expired - Lifetime CN201991483U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061733A (en) * 2013-01-14 2013-04-24 西南石油大学 Sleeve valve type fracturing production-increasing tool
CN107762443A (en) * 2016-08-18 2018-03-06 中国石油化工股份有限公司 Well repairing device and method for well fixing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061733A (en) * 2013-01-14 2013-04-24 西南石油大学 Sleeve valve type fracturing production-increasing tool
CN107762443A (en) * 2016-08-18 2018-03-06 中国石油化工股份有限公司 Well repairing device and method for well fixing
CN107762443B (en) * 2016-08-18 2019-12-24 中国石油化工股份有限公司 Well workover device and well workover method

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Granted publication date: 20110928

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