A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool
阅读说明：本技术 一种超低渗油藏低压堵塞水平井分段酸化方法 (A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool ) 是由 何衡 张矿生 李建山 卜向前 齐银 杨立安 黄婷 张进科 李建辉 顾燕凌 于 2019-08-21 设计创作，主要内容包括：本发明属于油田水平井分段酸化技术领域,具体涉及一种超低渗油藏低压堵塞水平井分段酸化方法,本方法针对超低渗油藏水平井五点或七点面积井网,地层压力保持水平小于80%的堵塞水平井,采用多级滑套酸化管柱,通过K344封隔器、滑套喷射器、滑套球座等组合,实现水平井不动管柱分段酸化施工,在分段酸化的同时,对没有对应注水井层段注入驱油压裂液补充地层能量,酸化后关井扩压1-2天后放喷反洗、复产。将水平井分段酸化与补充能量为一体,实现同层驱替的目的,进一步提高水平井分段酸化效果。(The invention belongs to oilfield horizontal well subsection acidizing technical fields, horizontal well in segments acidization tool is blocked more particularly to a kind of Oil in Super-low Permeability oil reservoir low pressure, this method is directed to 5 points or 7 areal well patterns of Oil in Super-low Permeability reservoir horizontal well, strata pressure keeps the horizontal blocking horizontal well less than 80%, tubing string is acidified using multistage sliding sleeve, pass through K344 packer, sliding sleeve injector, the combination such as sliding sleeve tee, realize the construction of horizontal well fixed tubular column subsection acidizing, while subsection acidizing, stratum energy is supplemented to no corresponding water injection well interval injection displacement of reservoir oil fracturing fluid, closing well diffusion open flow backwash after 1-2 days after acidification, it reproduces.Horizontal well in segments acidification and supplement energy are integrated, the purpose of same layer displacement is realized, further increases horizontal well in segments acidizing effect.)
1. a kind of Oil in Super-low Permeability oil reservoir low pressure blocks horizontal well in segments acidization tool, which comprises the following steps:
S1. according to the reservoir characteristic of Oil in Super-low Permeability oil reservoir, horizontal well patterns type, specially 5 areal well patterns or 7 faces are selected Product well pattern；
S2. the horizontal well pattern according to selected by step S1 designs multistage sliding sleeve and is acidified tubular column structure, then connects multistage sliding sleeve It is acidified tubing string, the multistage sliding sleeve connected is acidified in tubing string tripping in horizontal well pit shaft to design position；
S3. the horizontal well pattern according to selected by step S1 designs corresponding acidizing treatment interval number, and disposes each interval Operation mode；
S4. according to the operation mode of the step S3 each interval disposed, acidizing treatment or acidification successively are carried out to corresponding interval Add complementary energy integration of operation；
S5. after the acidizing treatment operation for completing all intervals, the acid solution in oil pipe is headed into stratum, closing well diffusion 1- with active water 2 days；
S6. open flow backwash pit shaft.
2. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that: In the step S2, multistage sliding sleeve acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one Sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packing Device, second level sliding sleeve injector, n grades of sleeve bases of second level chamfer tool oil pipe ..., n grades of K344 packers, n grades of sliding sleeve injectors, n Grade chamfer tool oil pipe, n grades of K344 packers, n grades of chamfer tool oil pipes and tool oil pipe.
3. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that: In the step S2, when selected horizontal well pattern is 5 areal well patterns, the multistage sliding sleeve of 5 areal well patterns is acidified pipe Column includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one Sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfering Tool oil pipe, three-level sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four K344 envelope Every device, level Four chamfer tool oil pipe and tool oil pipe；
When selected horizontal well pattern is 7 areal well patterns, the multistage sliding sleeve acidification tubing string of 7 areal well patterns includes artesian well Bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, Level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfer tool oil pipe, three Grade sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four sleeve base, level Four K344 envelope Every device, level Four sliding sleeve injector, level Four chamfer tool oil pipe, Pyatyi K344 packer, Pyatyi chamfer tool oil pipe and tool oil Pipe.
4. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that: In the step S3, when selected horizontal well pattern is 5 areal well patterns, the acidizing treatment interval number of 5 areal well patterns Design has 4 sections, wherein 1,4 section of progress acidizing treatment, 2,3 sections carry out acidification plus complementary energy integration of operation；Selected Horizontal Well net form When formula is 7 areal well patterns, the acidizing treatment interval number design of 7 areal well patterns has 5 sections, wherein 2,4 sections carry out acidification and add Complementary energy integration of operation, 1,3,5 section of progress acidizing treatment.
5. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that: In the step S4, acid solution used in acidizing treatment is buffer regulated HF acid, and pump fluence is 30-40 m3, discharge capacity is 1.0-2.0 m3/ min, Liquid used in complementary energy operation is displacement of reservoir oil fracturing fluid, and pump fluence is 500-1000 m3, discharge capacity is 1.0-2.0 m3/min。
6. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 5 blocks horizontal well in segments acidization tool, which is characterized in that The buffer regulated HF acid is grouped as by the group of following weight percent: technical hydrochloric acid 10-15%, hydrofluoric acid 1.5-3%, acetic acid 1.0- 3.0%, ferrous stability 0.4-0.6%, salt acid inhibitor 0.5-1.5%, cleanup additive 0.5-1.5%, surplus are water；
Wherein, the mass percentage concentration of the technical hydrochloric acid is 31%, and the mass percentage concentration of hydrofluoric acid is 40%；The iron ion Stabilizer is one of acetic acid, citric acid, disodium edta.
7. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 5 blocks horizontal well in segments acidization tool, which is characterized in that The displacement of reservoir oil type fracturing fluid is grouped as by the group of following weight percent: the Sulfonates washing oil surfactant of 0.1-0.5%, The KCl of 0.5-1.5%, surplus are water.
8. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, which is characterized in that The active water is grouped as by the group of following weight percent: cleanup additive 0.2-0.8%, clay stabilizer 0.2-0.8%, surplus are Water.
9. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that: The pump note discharge capacity of active water is 1-2.0m in the step S53/min。
10. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, feature exists In: closing well diffusion, which refers to, in the step S5 forces diffusion strata pressure by wellhead shut-in, and pressure derivative connects after closing well 1-2 days When being bordering on 0, fluid flow state switchs to stratum linear flow or radial flow by crack linear flow, and matrix filtrational resistance increases, can tie at this time Beam closing well.
Technical field
The invention belongs to oilfield horizontal well subsection acidizing technical fields, and in particular to a kind of Oil in Super-low Permeability oil reservoir low pressure blocking water Horizontal well subsection acidizing method.
Background technique
Changqing oilfields extra-low-permeability reservoir matrix permeability low (< 1.0 × 10-3um2), reservoir pressure coefficient is low (< 0.8), Horizontal well is in Oil in Super-low Permeability block sizable application, and initial stage transformation carries out staged fracturing, with the extension of horizontal well development time, part Horizontal well low yield is as caused by reservoir fouling.Early period is significantly low for blocking feature in Changqing oilfields ultra-low penetration block Produce the subsection acidizing that horizontal well is implemented, produce that liquid decline is very fast, short validity period is 3-4 months after the well measure of part daily, mainly by Keep horizontal less than 80% in part well strata pressure, although relieving the dirt of horizontal well blocking interval using subsection acidizing, Since 5 points or 7 repeating pattern floods of horizontal well are difficult to set up effective displacement system, stratum energy is gradually reduced, and causes to arrange Produce liquid decline after applying daily comparatively fast, validity period is short.Therefore it needs for blocking horizontal well of the strata pressure holding level less than 80%, Carry out a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool research.
Summary of the invention
In view of the above-mentioned problems existing in the prior art, the present invention provides a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal wells point Section acidization tool, this method are acidified tubing string using multistage sliding sleeve, pass through the groups such as K344 packer, sliding sleeve injector, sliding sleeve tee It closes, realizes the construction of horizontal well fixed tubular column subsection acidizing, while subsection acidizing, no corresponding water injection well interval injection is driven Oily fracturing fluid supplements stratum energy, and horizontal well in segments acidification and supplement energy are integrated, the purpose of same layer displacement is realized, into one Walk well subsection acidizing effect of improving the standard.
Technical solution of the present invention is as follows:
A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, comprising the following steps:
S1. according to the reservoir characteristic of Oil in Super-low Permeability oil reservoir, horizontal well patterns type, specially 5 areal well patterns or 7 faces are selected Product well pattern；
S2. the horizontal well pattern according to selected by step S1 designs multistage sliding sleeve and is acidified tubular column structure, then connects multistage sliding sleeve It is acidified tubing string, the multistage sliding sleeve connected is acidified in tubing string tripping in horizontal well pit shaft to design position；
S3. the horizontal well pattern according to selected by step S1 designs corresponding acidizing treatment interval number, and disposes each interval Operation mode；
S4. the operation mode according to designed by step S3 successively carries out acidizing treatment or acidification plus complementary energy joint to corresponding interval Operation；
S5. after the acidizing treatment operation for completing all intervals, the acid solution in oil pipe is headed into stratum, closing well diffusion 1- with active water 2 days；
S6. open flow backwash pit shaft.
In the step S2, multistage sliding sleeve acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, spray Emitter, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, two Grade K344 packer, second level sliding sleeve injector, n grades of sleeve bases of second level chamfer tool oil pipe ..., n grades of K344 packers, n grades of cunnings Cover injector, n grades of chamfer tool oil pipes, n grades of K344 packers, n grades of chamfer tool oil pipes and tool oil pipe.
In the step S2, when selected horizontal well pattern is 5 areal well patterns, the multistage of 5 areal well patterns is sliding Set acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packing Device, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, Second level chamfer tool oil pipe, three-level sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, four Grade K344 packer, level Four chamfer tool oil pipe and tool oil pipe；
When selected horizontal well pattern is 7 areal well patterns, the multistage sliding sleeve acidification tubing string of 7 areal well patterns includes artesian well Bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, Level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfer tool oil pipe, three Grade sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four sleeve base, level Four K344 envelope Every device, level Four sliding sleeve injector, level Four chamfer tool oil pipe, Pyatyi K344 packer, Pyatyi chamfer tool oil pipe and tool oil Pipe.
In the step S3, when selected horizontal well pattern is 5 areal well patterns, the acidification of 5 areal well patterns is applied The design of work interval number has 4 sections, wherein 1,4 section of progress acidizing treatment, 2,3 sections carry out acidification plus complementary energy integration of operation；Selected level When well well pattern form is 7 areal well patterns, the acidizing treatment interval number design of 7 areal well patterns has 5 sections, wherein 2,4 sections into Row acidification plus complementary energy integration of operation, 1,3,5 section of progress acidizing treatment.
In the step S4, acid solution used in acidizing treatment is buffer regulated HF acid, and pump fluence is 30-40 m3, discharge capacity 1.0- 2.0 m3/ min, liquid used in complementary energy operation are displacement of reservoir oil fracturing fluid, and pump fluence is 500-1000 m3, discharge capacity is 1.0-2.0 m3/ min。
The buffer regulated HF acid is grouped as by the group of following weight percent: technical hydrochloric acid 10-15%, hydrofluoric acid 1.5-3%, second Sour 1.0-3.0%, ferrous stability 0.4-0.6%, salt acid inhibitor 0.5-1.5%, cleanup additive 0.5-1.5%, surplus are water；
Wherein, the mass percentage concentration of the technical hydrochloric acid is 31%, and the mass percentage concentration of hydrofluoric acid is 40%；The iron ion Stabilizer is one of acetic acid, citric acid, disodium edta.
The displacement of reservoir oil type fracturing fluid is grouped as by the group of following weight percent: Sulfonates washing oil surfactant 0.1- 0.5%, KCl0.5-1.5%, surplus are water.
The active water is grouped as by the group of following weight percent: cleanup additive 0.2-0.8%, clay stabilizer 0.2- 0.8%, surplus is water.
The pump note discharge capacity of active water is 1-2.0m in the step S53/min。
Closing well diffusion, which refers to, in the step S5 forces diffusion strata pressure, pressure after closing well 1-2 days by wellhead shut-in When derivative is close to 0, fluid flow state switchs to stratum linear flow or radial flow by crack linear flow, and matrix filtrational resistance increases, this When can terminate closing well.
The invention has the advantages that
1, tubing string is acidified by multistage sliding sleeve, realizes that acidification, complementary energy, stewing well one plow brill, does not need open flow halfway, quickly environmental protection；
2, according to horizontal well patterns, stratum energy is supplemented by injecting displacement of reservoir oil fracturing fluid to no corresponding water injection well interval, it is other The subsection acidizing transformation of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well is realized in interval acidification；
3, dragging oil pipe is not needed, in the case where fixed tubular column, only need to put into steel ball, to each section of progress subsection acidizing measure, Easy for construction simple and direct, the period is short.
Specific embodiment
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