WO2018040139A1 - Limited-stage discontinuous and dual-spiral string for mixture of sand and liquid at well bottom - Google Patents

Limited-stage discontinuous and dual-spiral string for mixture of sand and liquid at well bottom Download PDF

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Publication number
WO2018040139A1
WO2018040139A1 PCT/CN2016/099268 CN2016099268W WO2018040139A1 WO 2018040139 A1 WO2018040139 A1 WO 2018040139A1 CN 2016099268 W CN2016099268 W CN 2016099268W WO 2018040139 A1 WO2018040139 A1 WO 2018040139A1
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double
stage
spiral
oil pipe
sand
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PCT/CN2016/099268
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French (fr)
Chinese (zh)
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仝少凯
王祖文
岳艳芳
白明伟
温亚魁
张冕
杨红斌
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中国石油集团川庆钻探工程有限公司长庆井下技术作业公司
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Publication of WO2018040139A1 publication Critical patent/WO2018040139A1/en

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets

Definitions

  • the invention relates to a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, which is mainly suitable for a horizontal well volume fracturing multi-stage cluster perforation fracturing pipe string.
  • the horizontal well volume fracturing technology is currently the mainstream transformation technology for the increase and storage of Changqing Oilfield.
  • the key tool for implementing this technology is multi-stage drag/multi-stage fixed-column hydraulic jet fracturing pipe string due to high pump. Under the flow of pressure, large displacement, large liquid volume and large amount of sand, the sand-carrying fluid is prone to sand separation and sediment deposition in the long horizontal section, thus reducing the sand concentration and sand entering the upstream and downstream injectors.
  • the amount of the perforation of the upstream and downstream injectors is not good, so that the perforation channel (width, length) can not reach the theoretical calculation value and numerical simulation results, which is not conducive to multi-stage clustering perforation, for subsequent fracturing Cracking caused certain difficulties.
  • the company independently developed a double-spiral splitting short section, and achieved good experimental results through field tests and laboratory experiments.
  • the experiment found that when the high-speed carrying sand flows through a straight pipe, the granular sand moves from the bottom of the pipeline to the central part of the pipeline, and more and more granular sand gathers toward the center of the pipeline and moves along the flow direction of the pipeline.
  • the distribution of sand concentration along the height of the pipeline is “high at the center of the pipeline and low at the upper and lower walls of the pipeline”, but when flowing through the double-spiral splitting short section, the high-speed sand carrying fluid is rapidly mixed and swirled in a swirling state.
  • the forward movement, after the double-spiral splitting short section the high-speed carrying sand still moves forward in a spiral swirling state, and the motion displacement is longer.
  • the innovation proposes whether the double-spiral splitting short joint can be connected at different positions of the pipe string to form a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, which can solve the current horizontal well volume fracturing length.
  • the problem of sand separation and granular sand deposition in the horizontal section is designed. For this reason, a finite-stage intermittent double-spindle bottom sand mixed liquid column is designed.
  • the invention increases the double spiral short section by spraying the different positions of the fracturing pipe column (the length of the certain oil pipe) in the multi-stage clustering, so that the high-speed sand carrying liquid flows through the first-stage double-spiral short section to generate a spiral swirling motion state, after After the double-coil short section, the high-speed sand carrying fluid still moves forward in a spiral swirling state, and the displacement of the movement is just the length of the tubing between each two-stage double-coiled short section, so that the high-speed carrying liquid is always maintained in the long horizontal section.
  • the technical problem to be solved by the invention is to provide a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, so that the large liquid amount and the high flow rate sand carrying liquid move in the spiral swirling state along the length of the pipe string to ensure the granular sand and the liquid.
  • the mixing is uniform in real time, thereby improving the stability of the sand concentration and the amount of sand in the horizontal sand section of the horizontal well, and achieving the effects of effective perforation and fracturing.
  • the finite-stage intermittent double-spindle bottom sand mixed liquid pipe column comprises a first-stage oil pipe and an n-th oil pipe connected in sequence from the wellhead to the bottom of the well, and the first-stage oil pipe and the n-th oil pipe are arranged in between a double-spiral short joint and an oil pipe, wherein the double-coil short joint and the oil pipe are alternately connected; the lower end of the n-th oil pipe is sequentially connected with an upper double-spiral short joint and an upper hydraulic ejector, and the lower end of the upper hydraulic ejector is sequentially connected There is a lower double screw short section and a lower hydraulic ejector. The lower end of the lower hydraulic ejector is connected with a telescopic compensator, and the lower end of the telescopic compensator is connected with a bottom seal drag fracturing packer.
  • An upper adjustment short joint is connected between the upper double spiral short section and the nth stage oil pipe, and the upper adjustment short section is connected with the nth stage oil pipe through a safety joint.
  • the lower double helix nipple is connected to the upper hydraulic ejector by a lower adjustment nipple.
  • a single flow valve is disposed between the lower hydraulic injector and the telescopic compensator.
  • the first-stage oil pipe and the n-th oil pipe have the same structure, and both are ⁇ 73 mm oil pipes.
  • the upper adjustment short section and the lower adjustment short section structure are the same, and both are ⁇ 73mm adjustment short joints.
  • the plurality of double spiral short sections have a length of 2500 mm, an outer diameter of 80 mm, an inner diameter of 40 mm, a spiral line in a clockwise direction, a helix angle of 45°, a double helix pitch of 120 mm, and a double helix line spacing of 30 mm.
  • the plurality of double spiral short sections are provided with spiral trapezoidal grooves, the spiral trapezoidal groove length is 120 mm, the groove depth is 5 mm, the groove bottom width is 10 mm, the trapezoidal angle is 60°, and the spiral trapezoidal groove is plated with anti-abrasion resistant material. .
  • a double spiral short section and an oil pipe are disposed between the first stage oil pipe and the nth stage oil pipe, and the double spiral short section and the oil pipe are alternately connected; the first stage oil pipe and the nth stage oil pipe are sequentially connected.
  • the invention is coated with anti-abrasion material in the double-spiral short-segment double-helical trapezoidal groove to prevent the double spiral flow path
  • Local erosion improves the swirling effect of the double spiral flow path.
  • the flow state moves until it moves to the upper and lower ejector of the clustering perforation, which effectively performs perforation and fracturing.
  • the application effect is remarkable and the practicability is strong, which solves the problem of sand separation and sediment deposition in the horizontal horizontal section of the current horizontal well.
  • the construction success rate of the multi-stage cluster perforation fracturing process of the horizontal well volume fracturing is improved.
  • Figure 1 is a schematic diagram of a mixed-stage tubular column with a finite-stage intermittent double-helix bottom.
  • Figure 3 is a top view of the double helix short section clockwise double helix groove.
  • the reference numerals are: 1-first-stage oil pipe; 2-first-stage double-coil short section; 3- second-stage oil pipe; 4-second-stage double-coil short section; 5-level 3 oil pipe; - 3rd stage double helix short section; 7 - 4th stage oil pipe; 8 - 4th stage double helix short section; 9th - nth grade oil pipe; 10 - safety joint; 11 - upper adjustment short section; 12 - upper double helix Short section; 13-upper hydraulic ejector; 14-down adjustment short section; 15-down double-spiral short section; 16-low hydraulic ejector; 17-single flow valve; 18-elastic compensator; 19-bottom seal Fracturing packer.
  • the invention provides a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column as shown in FIG. 1 , and the invention increases the double helix short by different positions (a certain oil pipe length) of the multi-stage splitting and spraying fracturing pipe column. Section, the high-speed carrying sand flows through the first-stage double-coil short section to produce a spiral swirling motion state.
  • the high-speed carrying sand liquid still moves forward in a spiral swirling state, and the displacement of the motion is exactly The length of the tubing between each two-stage double-coiled short section, so that the high-speed sand carrying fluid is always moved in a spiral swirling state in the long horizontal section until it moves to the clustering perforation and the downstream injector, effectively perforating And subsequent fracturing, to solve the problem of sand-liquid separation and grain sand deposition in the horizontal horizontal section of the current well, and to ensure the success rate of multi-stage cluster perforation fracturing process of horizontal well volume fracturing.
  • the technical problem to be solved by the present invention is to provide a finite-stage intermittent double-spindle bottom sand mixed liquid pipe column, so that The large liquid volume and high flow rate sand-carrying liquid moves along the length of the pipe string in a spiral swirling state to ensure uniform mixing of the granular sand and the liquid in real time, thereby improving the stability of sand concentration and sand amount in the sand-carrying liquid in the horizontal well section of the horizontal well. , to achieve effective perforation and fracturing effects.
  • the finite-stage intermittent double-spindle bottom sand mixed liquid pipe column comprises a first-stage oil pipe 1 and an n-th oil pipe 9 which are sequentially connected from the wellhead to the bottom of the well, and the first-stage oil pipe 1 and the n-th oil pipe 9 Between the plurality of double-spiral short joints and the oil pipe, the double-spiral short joint and the oil pipe are alternately connected; the lower end of the n-th oil pipe 9 is connected with an upper double-coiled short 12 and an upper hydraulic ejector 13 in sequence, A lower double screw 15 and a lower hydraulic ejector 16 are connected to the lower end of the upper hydraulic ejector 13 .
  • the lower end of the lower hydraulic ejector 16 is connected with a telescopic compensator 18, and the lower end of the telescopic compensator 18 is connected with a bottom seal.
  • the value of n in the n-th stage oil pipe 9 is determined, and the length of the oil pipe between each two-stage double-spiral short joint should be equal to that after the sand-carrying liquid passes through the upper-stage double-spiral short section.
  • the displacement of the spiral swirling state is still ensured that the spiral swirling state of the liquid carrying liquid with high liquid volume and high flow rate is continuously effective.
  • the length of the tubing is determined, and finally it is determined that several double-spiral short joints are required, and a plurality of double-screw short joints are convenient to be assembled and replaced in the construction work.
  • the invention is an important tool for realizing the remixing of sand liquid at the bottom of the well, and changes the moving flow state of the granular sand and liquid in the sand carrying liquid in the horizontal section of the horizontal well, so that the granular sand and the tube which are originally forced by gravity to sink
  • the liquid flowing in the diameter direction of the column is thoroughly mixed under the action of the double spiral swirling force and the centrifugal force, thereby ensuring the effective sand concentration of the sand carrying liquid under the high-speed flow, thereby maintaining the sand concentration at the upstream and downstream injectors of the multi-stage clustering perforation.
  • the invention relates to changing the moving flow state of the granular sand and the liquid in the sand carrying liquid in the horizontal horizontal section of the horizontal well, so that the granular sand which is originally forced by gravity to sink and the liquid flowing along the diameter direction of the tubular string are in the double spiral swirling flow and Fully mixed under the action of centrifugal force to ensure the effective sand concentration of the sand-carrying liquid under high-speed flow, thus maintaining the steady state of sand concentration on the multi-stage cluster perforation and downstream injector, ensuring normal perforation and subsequent fracturing It is suitable for application in horizontal well volume fracturing multi-stage cluster perforation fracturing column.
  • the upper double helix short section 12 and the nth grade oil An upper adjustment stub 11 is connected between the tubes 9, and the upper adjustment stub 11 is connected to the nth stage oil pipe 9 via a safety joint 10.
  • the lower double helix sub-segment 15 and the upper hydraulic ejector 13 are connected by a lower adjustment stub 14 .
  • a single flow valve 17 is disposed between the lower hydraulic injector 16 and the telescopic compensator 18.
  • the first-stage oil pipe 1 and the n-th oil pipe 9 have the same structure and are all ⁇ 73 mm oil pipes.
  • the upper adjustment short segment 11 and the lower adjustment short segment 14 have the same structure, and both are ⁇ 73 mm adjustment short segments.
  • the lengths of the plurality of double helix short sections are 2500 mm, the outer diameter is 80 mm, the inner diameter is 40 mm, the spiral line is in the clockwise direction, the helix angle is 45°, the double helix pitch is 120 mm, and the double helix line spacing is 30 mm. .
  • the plurality of double spiral short sections are provided with spiral trapezoidal grooves, the spiral trapezoidal groove length is 120 mm, the groove depth is 5 mm, the groove bottom width is 10 mm, the trapezoidal angle is 60°, and the spiral trapezoidal groove is plated with anti-abrasion resistant material. .
  • first-stage oil pipe 1 and the n-th oil pipe 9 there are four double-spiral short joints and four oil pipes, the double-screw short joints and the oil pipes are alternately connected; the first-stage oil pipe 1 and the n-th oil pipe 9 is connected with a first stage double spiral short section 2, a second stage oil pipe 3, a second stage double screw short section 4, a third stage oil pipe 5, a third stage double screw short section 6, and a fourth stage oil pipe 7
  • the finite-stage intermittent double-spindle bottom sand mixed liquid column is characterized by the wellhead to the horizontal bottom of the well: wherein each stage of the double-spiral short-segment cavity is designed and processed according to the principle of Archimedes double helix. And the surface of the double spiral trapezoidal groove is coated with wear-resistant material to prevent local erosion of the double spiral flow channel.
  • the large liquid volume and high flow rate sand carrying liquid can be moved along the spiral flow path in a spiral swirling state, and the granular sand and the liquid in the horizontal layer carrying sand liquid are thoroughly mixed uniformly, and the high-speed carrying sand liquid which is uniformly mixed is always moved to
  • the upper and lower injectors of the clustering perforation improve the perforating effect of the upstream and downstream injectors.
  • the length of the oil pipe between each two-stage double-helical short joint should be equal to the displacement of the sand-carrying liquid still moving in a spiral swirling state after passing through the upper double-spiral short section, thereby ensuring a large liquid volume and a high flow rate carrying liquid.
  • the spiral swirl state is continuously effective.
  • the upper and lower threaded fasteners of the double-spiral sub-segment are 2-7/8" EUE, 8 teeth per inch, and taper 1:16.
  • connection method of the present invention is a tubing threaded connection for easy disassembly and replacement.
  • the double-spiral short section of the invention has a length of 2500 mm, an outer diameter of 80 mm, an inner diameter of 40 mm, a spiral line in a clockwise direction, a helix angle of 45°, a double helix pitch of 120 mm, a double helix pitch of 30 mm, and a spiral trapezoid.
  • the groove length is 120 mm
  • the groove depth is 5 mm
  • the groove bottom width is 10 mm
  • the trapezoid angle is 60°.
  • the structural parameters of other tools in the present invention are consistent with conventional tool parameters, and may be selected according to size requirements, wherein the bottom seal drag fracturing packer 19 is a mechanical compression packer.
  • the plurality of double-spiral short joints of the invention adopts 35CrMo material, and the hardness of the heat treatment is 197-235HB, and the inner cavity is specially processed according to the principle of Archimedes double helix to process the double spiral trapezoidal groove, and the surface of the double spiral trapezoidal groove is It is plated with a nickel-based alloy material to prevent the fluid from partially eroding the spiral trapezoidal groove due to the change in the direction of rotation.
  • the double-spiral short-segment double-helical trapezoidal groove processing does not allow defects such as cracks and pores, and the spiral transition is smooth and smooth.
  • connection method of the present invention is a tubing threaded connection for easy disassembly and replacement.
  • the application mode of the invention is:
  • the oil and gas well is subjected to horizontal well volume fracturing, multi-stage dragging (immobility), pipe column, splitting, jet fracturing, and according to the construction pipe column structure diagram, the double spiral short joint is installed at different positions of the fracturing pipe column. , assembly and connect the fracturing column.
  • the pump is used to wash the well with a displacement of 0.6-1.0 m 3 /min, to ensure that the mechanical impurities of the wellbore are less than 0.2%, and the wellbore is clean.
  • the sand concentration is 130 ⁇ 145kg / m 3 with sand pumping along the fracturing column, when the high-speed carrying sand flows through multiple double helix short
  • the double-helical structure causes the high-speed sand carrying liquid to generate a spiral swirling motion state, and the granular sand in the sand carrying liquid and The liquid is well mixed evenly, and the high-speed sand-carrying liquid in the entire horizontal section of the fracturing pipe column is always moved in a spiral swirling state until it moves to the upper and lower water-injecting ejector 13 and the lower hydraulic ejector 16 to achieve the perforating purpose. Forming a communication channel between the wellbore and the formation.
  • the pump truck injects the displacement liquid at a displacement of 2.0 m 3 /min, and the sand carrying liquid in the fracture column is replaced by the formation, and then the fracture column is washed.
  • the casing annulus increases the displacement to 3.6 ⁇ 4.0m 3 /min to start the annulus fracturing.
  • the displacement of the pipe column is 1.0m 3 /min with the balance pressure, according to the construction.
  • the displacement fluid is injected at a displacement of 4.0 m 3 /min, and the fracturing fluid in the fracturing column is completely replaced by the formation to complete the reservoir fracturing transformation.
  • the wellhead is unloaded and the bottom of the well is unloaded and dragged and flocked packer 19, and according to the construction design pumping procedure, it is lifted to the specified well depth position, and the suspended weight is placed twice.
  • the fracturing packer 19 is dragged and the injection fracturing of the second stage is continued according to the hydraulic perforating and fracturing steps described above.
  • the fracturing pipe string will be taken out of the wellhead, the oil and gas pipeline column completion will be re-introduced, the wellhead device will be installed, and multiple alternately connected oil pipes and double spiral short sections will be dismantled and inspected in time.
  • nth-stage double-spiral sub-segment and the upper double-coiled short 12 and the lower double-spiral sub-section 15 are used to perform the hydraulic jet fracturing construction again.

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Abstract

Disclosed is a limited-stage discontinuous and dual-spiral string for a mixture of sand and liquid at a well bottom, the string comprising a first stage oil tube (1) and an nth stage oil tube (9) which are connected in sequence from the well head to the well bottom, wherein a plurality of dual-spiral pup joints and oil tubes are provided between the first stage oil tube (1) and the nth stage oil tube (9), the dual-spiral pup joints and the oil tubes being connected alternately. An upper dual-spiral pup joint (12) and an upper hydraulic ejector (13) are connected in sequence at a lower end of the n-th stage oil tube (9), a lower dual-spiral pup joint (15) and a lower hydraulic ejector (16) are connected in sequence at a lower end of the upper hydraulic ejector (13), an expansion compensator (18) is connected at a lower end of the lower hydraulic ejector (16), and a bottom dragging fracturing packer (19) is connected at a lower end of the expansion compensator (18). By utilizing the string, a large amount of liquid with sand at a high flow rate moves in a spiral flow state along a spiral flow channel and an effective sand concentration is ensured, maintaining the concentration of sand entering the ejectors upstream and downstream of a multi-stage clustering perforation in a stable condition, thus improving the perforation effect.

Description

有限级间断式双螺旋井底砂液混配管柱Finite-stage intermittent double-spindle bottom sand mixing column 技术领域Technical field
本发明涉及有限级间断式双螺旋井底砂液混配管柱，主要适用于水平井体积压裂多级分簇射孔压裂管柱中。The invention relates to a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, which is mainly suitable for a horizontal well volume fracturing multi-stage cluster perforation fracturing pipe string.
背景技术Background technique
水平井体积压裂技术是目前长庆油田增储上产的主流改造技术，实施这项技术的关键工具串为多级拖动/多级不动管柱水力喷射压裂管柱，由于高泵压、大排量、大液量、大砂量流体流动下，携砂液在长水平段容易出现砂液分离、颗粒砂沉积现象，这样降低了进入上、下游喷射器处的砂浓度、砂量，导致上、下游喷射器射孔效果不佳，使产生的射孔通道(宽度、长度)达不到理论计算值和数值模拟结果，不利于多级分簇射孔，给后续压裂起裂造成一定的困难。The horizontal well volume fracturing technology is currently the mainstream transformation technology for the increase and storage of Changqing Oilfield. The key tool for implementing this technology is multi-stage drag/multi-stage fixed-column hydraulic jet fracturing pipe string due to high pump. Under the flow of pressure, large displacement, large liquid volume and large amount of sand, the sand-carrying fluid is prone to sand separation and sediment deposition in the long horizontal section, thus reducing the sand concentration and sand entering the upstream and downstream injectors. The amount of the perforation of the upstream and downstream injectors is not good, so that the perforation channel (width, length) can not reach the theoretical calculation value and numerical simulation results, which is not conducive to multi-stage clustering perforation, for subsequent fracturing Cracking caused certain difficulties.
为此，公司自主研发了双螺旋分流短节，通过现场试验和室内实验，取得了良好的实验效果。实验发现，高速携砂液流经一段等直管时，颗粒砂从管路底部运动到管路中心部位，越来越多的颗粒砂向管路中心部位聚集，并沿管路液流方向运动，砂浓度沿管路高度分布规律为“管路中心处高，管路上、下壁处低”，但流经双螺旋分流短节时，高速携砂液以旋流状态迅速混合均匀并以螺旋式向前运动，经过双螺旋分流短节后，高速携砂液仍然以螺旋式旋流状态向前运动，而且运动位移较长。To this end, the company independently developed a double-spiral splitting short section, and achieved good experimental results through field tests and laboratory experiments. The experiment found that when the high-speed carrying sand flows through a straight pipe, the granular sand moves from the bottom of the pipeline to the central part of the pipeline, and more and more granular sand gathers toward the center of the pipeline and moves along the flow direction of the pipeline. The distribution of sand concentration along the height of the pipeline is “high at the center of the pipeline and low at the upper and lower walls of the pipeline”, but when flowing through the double-spiral splitting short section, the high-speed sand carrying fluid is rapidly mixed and swirled in a swirling state. The forward movement, after the double-spiral splitting short section, the high-speed carrying sand still moves forward in a spiral swirling state, and the motion displacement is longer.
根据上述现象和原理，创新提出是否可以在管柱的不同位置处连接这种双螺旋分流短节，组成有限级间断式双螺旋井底砂液混配管柱，正好解决目前水平井体积压裂长水平段砂液分离、颗粒砂沉积的问题，为此，设计了有限级间断式双螺旋井底砂液混配管柱。According to the above phenomena and principles, the innovation proposes whether the double-spiral splitting short joint can be connected at different positions of the pipe string to form a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, which can solve the current horizontal well volume fracturing length. The problem of sand separation and granular sand deposition in the horizontal section is designed. For this reason, a finite-stage intermittent double-spindle bottom sand mixed liquid column is designed.
发明内容Summary of the invention
本发明通过在多级分簇喷射压裂管柱不同的位置(一定油管长度)增加双螺旋短节，使高速携砂液流经第一级双螺旋短节时产生螺旋旋流运动状态，经过双螺旋短节后高速携砂液仍然以螺旋旋流状态向前运动，而且运动的位移恰好为每两级双螺旋短节之间的油管长度，从而始终保持高速携砂液在长水平段中以螺旋旋流状态运动，直至运动到分簇射孔上、下游喷射器处，有效进行射孔和后续压 裂，解决目前水平井长水平段砂液分离、颗粒砂沉积问题，确保水平井体积压裂多级分簇射孔压裂工艺施工成功率。The invention increases the double spiral short section by spraying the different positions of the fracturing pipe column (the length of the certain oil pipe) in the multi-stage clustering, so that the high-speed sand carrying liquid flows through the first-stage double-spiral short section to generate a spiral swirling motion state, after After the double-coil short section, the high-speed sand carrying fluid still moves forward in a spiral swirling state, and the displacement of the movement is just the length of the tubing between each two-stage double-coiled short section, so that the high-speed carrying liquid is always maintained in the long horizontal section. Movement in a spiral swirling state until moving to the clustered perforation and downstream injectors, effectively performing perforation and subsequent pressure Cracking, solve the problem of sand-liquid separation and grain sand deposition in the horizontal horizontal section of the current well, and ensure the success rate of multi-stage clustering perforation fracturing process of horizontal well volume fracturing.
本发明要解决的技术问题是提供有限级间断式双螺旋井底砂液混配管柱，使大液量、高流速携砂液以螺旋旋流状态沿管柱长度方向运动，保证颗粒砂和液体实时混合均匀，据此提高水平井长水平段携砂液中砂浓度、砂量的稳定性，达到有效射孔和压裂的效果。The technical problem to be solved by the invention is to provide a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column, so that the large liquid amount and the high flow rate sand carrying liquid move in the spiral swirling state along the length of the pipe string to ensure the granular sand and the liquid. The mixing is uniform in real time, thereby improving the stability of the sand concentration and the amount of sand in the horizontal sand section of the horizontal well, and achieving the effects of effective perforation and fracturing.
本发明采用的技术方案为：The technical solution adopted by the invention is:
有限级间断式双螺旋井底砂液混配管柱，包括从井口到井底依次连接的第一级油管、和第n级油管，所述第一级油管与第n级油管之间设置有多个双螺旋短节和油管，所述的双螺旋短节和油管交替连接；所述第n级油管下端依次连接有上双螺旋短节和上水力喷射器，所述上水力喷射器下端依次连接有下双螺旋短节和下水力喷射器，所述下水力喷射器下端连接有伸缩补偿器，所述伸缩补偿器下端连接有底封拖动压裂封隔器。The finite-stage intermittent double-spindle bottom sand mixed liquid pipe column comprises a first-stage oil pipe and an n-th oil pipe connected in sequence from the wellhead to the bottom of the well, and the first-stage oil pipe and the n-th oil pipe are arranged in between a double-spiral short joint and an oil pipe, wherein the double-coil short joint and the oil pipe are alternately connected; the lower end of the n-th oil pipe is sequentially connected with an upper double-spiral short joint and an upper hydraulic ejector, and the lower end of the upper hydraulic ejector is sequentially connected There is a lower double screw short section and a lower hydraulic ejector. The lower end of the lower hydraulic ejector is connected with a telescopic compensator, and the lower end of the telescopic compensator is connected with a bottom seal drag fracturing packer.
所述上双螺旋短节与第n级油管之间连接有上调整短节，所述上调整短节与第n级油管通过安全接头连接。An upper adjustment short joint is connected between the upper double spiral short section and the nth stage oil pipe, and the upper adjustment short section is connected with the nth stage oil pipe through a safety joint.
所述下双螺旋短节与上水力喷射器之间通过下调整短节连接。The lower double helix nipple is connected to the upper hydraulic ejector by a lower adjustment nipple.
所述下水力喷射器与伸缩补偿器之间设置有单流阀。A single flow valve is disposed between the lower hydraulic injector and the telescopic compensator.
所述的第一级油管和第n级油管结构相同，均为Φ73mm油管。The first-stage oil pipe and the n-th oil pipe have the same structure, and both are Φ73 mm oil pipes.
所述的上调整短节和下调整短节结构相同，均为Φ73mm调整短节。The upper adjustment short section and the lower adjustment short section structure are the same, and both are Φ73mm adjustment short joints.
上述多个双螺旋短节长度均为2500mm，外径80mm，内径40mm，螺旋线沿顺时针方向，螺旋角45°，双螺旋螺距120mm，双螺旋线间距30mm。The plurality of double spiral short sections have a length of 2500 mm, an outer diameter of 80 mm, an inner diameter of 40 mm, a spiral line in a clockwise direction, a helix angle of 45°, a double helix pitch of 120 mm, and a double helix line spacing of 30 mm.
所述的多个双螺旋短节内设有螺旋梯形槽，其螺旋梯形槽长120mm，槽深5mm，槽底部宽度10mm，梯形角60°，所述的螺旋梯形槽内镀有抗耐磨材料。The plurality of double spiral short sections are provided with spiral trapezoidal grooves, the spiral trapezoidal groove length is 120 mm, the groove depth is 5 mm, the groove bottom width is 10 mm, the trapezoidal angle is 60°, and the spiral trapezoidal groove is plated with anti-abrasion resistant material. .
所述第一级油管与第n级油管之间设置有个双螺旋短节和个油管，所述的双螺旋短节和油管交替连接；第一级油管与第n级油管之间依次连接有第一级双螺旋短节、第二级油管、第二级双螺旋短节，第三级油管、第三级双螺旋短节、第四级油管、第四级双螺旋短节。A double spiral short section and an oil pipe are disposed between the first stage oil pipe and the nth stage oil pipe, and the double spiral short section and the oil pipe are alternately connected; the first stage oil pipe and the nth stage oil pipe are sequentially connected The first stage double spiral short section, the second stage oil pipe, the second stage double spiral short section, the third stage oil pipe, the third stage double spiral short section, the fourth stage oil pipe, and the fourth stage double spiral short section.
本发明的有益效果为：The beneficial effects of the invention are:
本发明在双螺旋短节双螺旋梯形槽内镀有抗耐磨材料，防止了双螺旋流道的 局部冲蚀，提高了双螺旋流道的旋流效果。通过在多级分簇喷射压裂管柱不同的位置(一定油管长度)增加双螺旋短节，使高速携砂液流经第一级双螺旋短节时产生螺旋旋流运动状态，经过双螺旋短节后高速携砂液仍然以螺旋旋流状态向前运动，而且运动的位移恰好为每两级双螺旋短节之间的油管长度，始终保持高速携砂液在长水平段中以螺旋旋流状态运动，直至运动到分簇射孔上、下游喷射器处，有效进行射孔和压裂，应用效果显著，实用性强，解决了目前水平井长水平段砂液分离、颗粒砂沉积问题，提高了水平井体积压裂多级分簇射孔压裂工艺施工成功率。The invention is coated with anti-abrasion material in the double-spiral short-segment double-helical trapezoidal groove to prevent the double spiral flow path Local erosion improves the swirling effect of the double spiral flow path. By increasing the double-spiral nipple at different positions of the multi-stage clustering fracturing pipe column (certain tubing length), the high-speed sand carrying fluid flows through the first-stage double-coil nipple to generate a spiral swirling motion state, after the double helix After the short section, the high-speed sand carrying fluid still moves forward in a spiral swirling state, and the displacement of the movement is just the length of the tubing between each two-stage double-coiled short section, and the high-speed carrying sand liquid is always spirally rotated in the long horizontal section. The flow state moves until it moves to the upper and lower ejector of the clustering perforation, which effectively performs perforation and fracturing. The application effect is remarkable and the practicability is strong, which solves the problem of sand separation and sediment deposition in the horizontal horizontal section of the current horizontal well. The construction success rate of the multi-stage cluster perforation fracturing process of the horizontal well volume fracturing is improved.
以下将结合附图进行进一步的说明。Further explanation will be given below with reference to the drawings.
附图说明DRAWINGS
图1为有限级间断式双螺旋井底砂液混配管柱示意图。Figure 1 is a schematic diagram of a mixed-stage tubular column with a finite-stage intermittent double-helix bottom.
图2双螺旋短节顺时针双螺旋线展开图.Figure 2. Double-coiled short section clockwise double helix development.
图3双螺旋短节顺时针双螺旋槽俯视图。Figure 3 is a top view of the double helix short section clockwise double helix groove.
图中，附图标记为：1-第一级油管；2-第1级双螺旋短节；3-第2级油管；4-第2级双螺旋短节；5-第3级油管；6-第3级双螺旋短节；7-第四级油管；8-第四级双螺旋短节；9-第n级油管；10-安全接头；11-上调整短节；12-上双螺旋短节；13-上水力喷射器；14-下调整短节；15-下双螺旋短节；16-下水力喷射器；17-单流阀；18-伸缩补偿器；19-底封拖动压裂封隔器。In the figure, the reference numerals are: 1-first-stage oil pipe; 2-first-stage double-coil short section; 3- second-stage oil pipe; 4-second-stage double-coil short section; 5-level 3 oil pipe; - 3rd stage double helix short section; 7 - 4th stage oil pipe; 8 - 4th stage double helix short section; 9th - nth grade oil pipe; 10 - safety joint; 11 - upper adjustment short section; 12 - upper double helix Short section; 13-upper hydraulic ejector; 14-down adjustment short section; 15-down double-spiral short section; 16-low hydraulic ejector; 17-single flow valve; 18-elastic compensator; 19-bottom seal Fracturing packer.
具体实施方式detailed description
实施例1：Example 1:
本发明提供一种如图1所示的有限级间断式双螺旋井底砂液混配管柱，本发明通过在多级分簇喷射压裂管柱不同的位置(一定油管长度)增加双螺旋短节，使高速携砂液流经第一级双螺旋短节时产生螺旋旋流运动状态，经过双螺旋短节后高速携砂液仍然以螺旋旋流状态向前运动，而且运动的位移恰好为每两级双螺旋短节之间的油管长度，从而始终保持高速携砂液在长水平段中以螺旋旋流状态运动，直至运动到分簇射孔上、下游喷射器处，有效进行射孔和后续压裂，解决目前水平井长水平段砂液分离、颗粒砂沉积问题，确保水平井体积压裂多级分簇射孔压裂工艺施工成功率。The invention provides a finite-stage intermittent double-spiral bottom sand mixed liquid pipe column as shown in FIG. 1 , and the invention increases the double helix short by different positions (a certain oil pipe length) of the multi-stage splitting and spraying fracturing pipe column. Section, the high-speed carrying sand flows through the first-stage double-coil short section to produce a spiral swirling motion state. After the double-spiral short section, the high-speed carrying sand liquid still moves forward in a spiral swirling state, and the displacement of the motion is exactly The length of the tubing between each two-stage double-coiled short section, so that the high-speed sand carrying fluid is always moved in a spiral swirling state in the long horizontal section until it moves to the clustering perforation and the downstream injector, effectively perforating And subsequent fracturing, to solve the problem of sand-liquid separation and grain sand deposition in the horizontal horizontal section of the current well, and to ensure the success rate of multi-stage cluster perforation fracturing process of horizontal well volume fracturing.
本发明要解决的技术问题是提供有限级间断式双螺旋井底砂液混配管柱，使 大液量、高流速携砂液以螺旋旋流状态沿管柱长度方向运动，保证颗粒砂和液体实时混合均匀，据此提高水平井长水平段携砂液中砂浓度、砂量的稳定性，达到有效射孔和压裂的效果。The technical problem to be solved by the present invention is to provide a finite-stage intermittent double-spindle bottom sand mixed liquid pipe column, so that The large liquid volume and high flow rate sand-carrying liquid moves along the length of the pipe string in a spiral swirling state to ensure uniform mixing of the granular sand and the liquid in real time, thereby improving the stability of sand concentration and sand amount in the sand-carrying liquid in the horizontal well section of the horizontal well. , to achieve effective perforation and fracturing effects.
有限级间断式双螺旋井底砂液混配管柱，包括从井口到井底依次连接的第一级油管1、和第n级油管9，所述第一级油管1与第n级油管9之间设置有多个双螺旋短节和油管，所述的双螺旋短节和油管交替连接；所述第n级油管9下端依次连接有上双螺旋短节12和上水力喷射器13，所述上水力喷射器13下端依次连接有下双螺旋短节15和下水力喷射器16，所述下水力喷射器16下端连接有伸缩补偿器18，所述伸缩补偿器18下端连接有底封拖动压裂封隔器19。The finite-stage intermittent double-spindle bottom sand mixed liquid pipe column comprises a first-stage oil pipe 1 and an n-th oil pipe 9 which are sequentially connected from the wellhead to the bottom of the well, and the first-stage oil pipe 1 and the n-th oil pipe 9 Between the plurality of double-spiral short joints and the oil pipe, the double-spiral short joint and the oil pipe are alternately connected; the lower end of the n-th oil pipe 9 is connected with an upper double-coiled short 12 and an upper hydraulic ejector 13 in sequence, A lower double screw 15 and a lower hydraulic ejector 16 are connected to the lower end of the upper hydraulic ejector 13 . The lower end of the lower hydraulic ejector 16 is connected with a telescopic compensator 18, and the lower end of the telescopic compensator 18 is connected with a bottom seal. Fracturing packer 19.
本实施例中根据现场的需要，确定所述第n级油管9中n的值，在每两级双螺旋短节之间的油管的长度应等于携砂液通过上一级双螺旋短节后仍然以螺旋旋流状态运动的位移，保证大液量、高流速携砂液的螺旋旋流状态连续有效。这样确定好油管长度，最终确定需要几节双螺旋短节，多个双螺旋短节便于在施工作业中调配和更换。In this embodiment, according to the needs of the site, the value of n in the n-th stage oil pipe 9 is determined, and the length of the oil pipe between each two-stage double-spiral short joint should be equal to that after the sand-carrying liquid passes through the upper-stage double-spiral short section. The displacement of the spiral swirling state is still ensured that the spiral swirling state of the liquid carrying liquid with high liquid volume and high flow rate is continuously effective. In this way, the length of the tubing is determined, and finally it is determined that several double-spiral short joints are required, and a plurality of double-screw short joints are convenient to be assembled and replaced in the construction work.
本发明是实现井底砂液重新混配的重要工具，改变了进入水平井长水平段携砂液中颗粒砂、液体的运动流态，使原本受重力作用迫使下沉的颗粒砂和沿管柱直径方向流动的液体在双螺旋旋流和离心力作用下充分混合，保证了高速流动下携砂液的有效砂浓度，从而保持了进入多级分簇射孔上、下游喷射器处砂浓度的稳定状态，确保了正常射孔及后续压裂，适合应用于水平井体积压裂多级分簇射孔压裂管柱中。其他水平井体积压裂多级不动/拖动水力喷射压裂管柱结构可以在上述管柱图中适当增加或更换相应工具，但第n级双螺旋短节以上的管柱保持不变。The invention is an important tool for realizing the remixing of sand liquid at the bottom of the well, and changes the moving flow state of the granular sand and liquid in the sand carrying liquid in the horizontal section of the horizontal well, so that the granular sand and the tube which are originally forced by gravity to sink The liquid flowing in the diameter direction of the column is thoroughly mixed under the action of the double spiral swirling force and the centrifugal force, thereby ensuring the effective sand concentration of the sand carrying liquid under the high-speed flow, thereby maintaining the sand concentration at the upstream and downstream injectors of the multi-stage clustering perforation. Stable state, ensuring normal perforation and subsequent fracturing, suitable for horizontal well volume fracturing multi-stage cluster perforation fracturing string. Other horizontal well volume fracturing multi-stage fixed/drag hydraulic jet fracturing tubular string structure can appropriately increase or replace the corresponding tool in the above-mentioned column diagram, but the column above the n-th double-spiral short section remains unchanged.
本发明涉改变了进入水平井长水平段携砂液中颗粒砂、液体的运动流态，使原本受重力作用迫使下沉的颗粒砂和沿管柱直径方向流动的液体在双螺旋旋流和离心力作用下充分混合，保证了高速流动下携砂液的有效砂浓度，从而保持了进入多级分簇射孔上、下游喷射器处砂浓度的稳定状态，确保了正常射孔及后续压裂，适合应用于水平井体积压裂多级分簇射孔压裂管柱中。The invention relates to changing the moving flow state of the granular sand and the liquid in the sand carrying liquid in the horizontal horizontal section of the horizontal well, so that the granular sand which is originally forced by gravity to sink and the liquid flowing along the diameter direction of the tubular string are in the double spiral swirling flow and Fully mixed under the action of centrifugal force to ensure the effective sand concentration of the sand-carrying liquid under high-speed flow, thus maintaining the steady state of sand concentration on the multi-stage cluster perforation and downstream injector, ensuring normal perforation and subsequent fracturing It is suitable for application in horizontal well volume fracturing multi-stage cluster perforation fracturing column.
实施例2：Example 2:
基于上述实施例的基础上，本实施例中，所述上双螺旋短节12与第n级油 管9之间连接有上调整短节11，所述上调整短节11与第n级油管9通过安全接头10连接。Based on the above embodiment, in the present embodiment, the upper double helix short section 12 and the nth grade oil An upper adjustment stub 11 is connected between the tubes 9, and the upper adjustment stub 11 is connected to the nth stage oil pipe 9 via a safety joint 10.
所述下双螺旋短节15与上水力喷射器13之间通过下调整短节14连接。The lower double helix sub-segment 15 and the upper hydraulic ejector 13 are connected by a lower adjustment stub 14 .
所述下水力喷射器16与伸缩补偿器18之间设置有单流阀17。A single flow valve 17 is disposed between the lower hydraulic injector 16 and the telescopic compensator 18.
所述的第一级油管1和第n级油管9结构相同，均为Φ73mm油管。The first-stage oil pipe 1 and the n-th oil pipe 9 have the same structure and are all Φ73 mm oil pipes.
所述的上调整短节11和下调整短节14结构相同，均为Φ73mm调整短节。The upper adjustment short segment 11 and the lower adjustment short segment 14 have the same structure, and both are Φ73 mm adjustment short segments.
如图2、图3所示，上述多个双螺旋短节长度均为2500mm，外径80mm，内径40mm，螺旋线沿顺时针方向，螺旋角45°，双螺旋螺距120mm，双螺旋线间距30mm。As shown in Fig. 2 and Fig. 3, the lengths of the plurality of double helix short sections are 2500 mm, the outer diameter is 80 mm, the inner diameter is 40 mm, the spiral line is in the clockwise direction, the helix angle is 45°, the double helix pitch is 120 mm, and the double helix line spacing is 30 mm. .
所述的多个双螺旋短节内设有螺旋梯形槽，其螺旋梯形槽长120mm，槽深5mm，槽底部宽度10mm，梯形角60°，所述的螺旋梯形槽内镀有抗耐磨材料。The plurality of double spiral short sections are provided with spiral trapezoidal grooves, the spiral trapezoidal groove length is 120 mm, the groove depth is 5 mm, the groove bottom width is 10 mm, the trapezoidal angle is 60°, and the spiral trapezoidal groove is plated with anti-abrasion resistant material. .
所述第一级油管1与第n级油管9之间设置有4个双螺旋短节和4个油管，所述的双螺旋短节和油管交替连接；第一级油管1与第n级油管9之间依次连接有第一级双螺旋短节2、第二级油管3、第二级双螺旋短节4，第三级油管5、第三级双螺旋短节6、第四级油管7、第四级双螺旋短节8。Between the first-stage oil pipe 1 and the n-th oil pipe 9, there are four double-spiral short joints and four oil pipes, the double-screw short joints and the oil pipes are alternately connected; the first-stage oil pipe 1 and the n-th oil pipe 9 is connected with a first stage double spiral short section 2, a second stage oil pipe 3, a second stage double screw short section 4, a third stage oil pipe 5, a third stage double screw short section 6, and a fourth stage oil pipe 7 The fourth stage double helix short section 8.
有限级间断式双螺旋井底砂液混配管柱，其特征在于从井口到水平井底：其中，每一级双螺旋短节内腔根据阿基米德双螺旋线原理设计加工双螺旋梯形槽，并在双螺旋梯形槽表面镀有耐磨材料，以防止双螺旋流道的局部冲蚀。可以使大液量、高流速携砂液沿螺旋线流道以螺旋旋流状态运动，将水平段携砂液中的颗粒砂和液体充分混合均匀，始终保持混合均匀的高速携砂液运动到分簇射孔上、下游喷射器处，提高上、下游喷射器射孔效果。The finite-stage intermittent double-spindle bottom sand mixed liquid column is characterized by the wellhead to the horizontal bottom of the well: wherein each stage of the double-spiral short-segment cavity is designed and processed according to the principle of Archimedes double helix. And the surface of the double spiral trapezoidal groove is coated with wear-resistant material to prevent local erosion of the double spiral flow channel. The large liquid volume and high flow rate sand carrying liquid can be moved along the spiral flow path in a spiral swirling state, and the granular sand and the liquid in the horizontal layer carrying sand liquid are thoroughly mixed uniformly, and the high-speed carrying sand liquid which is uniformly mixed is always moved to The upper and lower injectors of the clustering perforation improve the perforating effect of the upstream and downstream injectors.
本发明中每两级双螺旋短节之间的油管的长度应等于携砂液通过上一级双螺旋短节后仍然以螺旋旋流状态运动的位移，保证大液量、高流速携砂液的螺旋旋流状态连续有效。In the present invention, the length of the oil pipe between each two-stage double-helical short joint should be equal to the displacement of the sand-carrying liquid still moving in a spiral swirling state after passing through the upper double-spiral short section, thereby ensuring a large liquid volume and a high flow rate carrying liquid. The spiral swirl state is continuously effective.
本发明中双螺旋短节的上、下部螺纹扣型为2-7/8"EUE，每英寸8牙，锥度1:16。In the present invention, the upper and lower threaded fasteners of the double-spiral sub-segment are 2-7/8" EUE, 8 teeth per inch, and taper 1:16.
本发明的连接方式为油管螺纹连接，以便于拆卸和更换。The connection method of the present invention is a tubing threaded connection for easy disassembly and replacement.
本发明中的双螺旋短节长度2500mm，外径80mm，内径40mm，螺旋线沿顺时针方向，螺旋角45°，双螺旋螺距120mm，双螺旋线间距30mm，螺旋梯形 槽长120mm，槽深5mm，槽底部宽度10mm，梯形角60°。The double-spiral short section of the invention has a length of 2500 mm, an outer diameter of 80 mm, an inner diameter of 40 mm, a spiral line in a clockwise direction, a helix angle of 45°, a double helix pitch of 120 mm, a double helix pitch of 30 mm, and a spiral trapezoid. The groove length is 120 mm, the groove depth is 5 mm, the groove bottom width is 10 mm, and the trapezoid angle is 60°.
本发明中的其他工具的结构参数与常规工具参数一致，按尺寸要求选用即可，其中底封拖动压裂封隔器19为机械压缩式封隔器。The structural parameters of other tools in the present invention are consistent with conventional tool parameters, and may be selected according to size requirements, wherein the bottom seal drag fracturing packer 19 is a mechanical compression packer.
本发明中的多个双螺旋短节其本体均采用35CrMo材料，经热处理硬度达197～235HB，内腔根据阿基米德双螺旋线原理特殊加工双螺旋梯形槽，并在双螺旋梯形槽表面镀有镍基合金材料以防止流体由于旋向的改变而引起螺旋梯形槽局部冲蚀。该双螺旋短节双螺旋梯形槽加工不允许有裂纹、气孔等缺陷，螺旋过渡平缓光滑。The plurality of double-spiral short joints of the invention adopts 35CrMo material, and the hardness of the heat treatment is 197-235HB, and the inner cavity is specially processed according to the principle of Archimedes double helix to process the double spiral trapezoidal groove, and the surface of the double spiral trapezoidal groove is It is plated with a nickel-based alloy material to prevent the fluid from partially eroding the spiral trapezoidal groove due to the change in the direction of rotation. The double-spiral short-segment double-helical trapezoidal groove processing does not allow defects such as cracks and pores, and the spiral transition is smooth and smooth.
本发明的连接方式为油管螺纹连接，以便于拆卸和更换。The connection method of the present invention is a tubing threaded connection for easy disassembly and replacement.
本发明的应用方式为：The application mode of the invention is:
1.首先油气井进行水平井体积压裂多级拖动(不动)管柱分簇喷射压裂施工前，根据施工管柱结构图，将双螺旋短节安装在压裂管柱的不同位置，组装连接好压裂管柱。1. First, the oil and gas well is subjected to horizontal well volume fracturing, multi-stage dragging (immobility), pipe column, splitting, jet fracturing, and according to the construction pipe column structure diagram, the double spiral short joint is installed at different positions of the fracturing pipe column. , assembly and connect the fracturing column.
2.将上述压裂管柱下入到设计井深位置，然后井口释放管柱悬重，坐封底封拖动压裂封隔器19，实现压裂管柱的可靠密封和定位。2. The above-mentioned fracturing pipe string is lowered into the design well depth position, then the wellhead releases the pipe column hanging weight, and the bottom seal seals the fracturing packer 19 to achieve reliable sealing and positioning of the fracturing pipe string.
3.上述压裂管柱入井坐封锚定后，利用泵车以排量0.6～1.0m3/min清水循环洗井，保证井筒机械杂质含量小于0.2％，井筒清洁干净。3. After the above-mentioned fracturing column is anchored in the well, the pump is used to wash the well with a displacement of 0.6-1.0 m 3 /min, to ensure that the mechanical impurities of the wellbore are less than 0.2%, and the wellbore is clean.
4.然后提高泵车排量至1.0～2.0m3/min，将砂浓度为130～145kg/m3携砂液沿压裂管柱泵入，当高速携砂液流经多个双螺旋短节到第n级双螺旋短节和下双螺旋短节12与下双螺旋短节15时，由于双螺旋结构使高速携砂液产生螺旋旋流运动状态，将携砂液中的颗粒砂和液体充分混合均匀，保持整个水平段压裂管柱内高速携砂液始终以螺旋旋流状态运动，直至运动到上、下游上水力喷射器13和下水力喷射器16处，达到射孔目的，形成井筒与地层连通通道。4. Then increase the pump displacement to 1.0 ~ 2.0m 3 / min, the sand concentration is 130 ~ 145kg / m 3 with sand pumping along the fracturing column, when the high-speed carrying sand flows through multiple double helix short When the n-th stage double helix short section and the lower double helix short section 12 and the lower double helix short section 15 are used, the double-helical structure causes the high-speed sand carrying liquid to generate a spiral swirling motion state, and the granular sand in the sand carrying liquid and The liquid is well mixed evenly, and the high-speed sand-carrying liquid in the entire horizontal section of the fracturing pipe column is always moved in a spiral swirling state until it moves to the upper and lower water-injecting ejector 13 and the lower hydraulic ejector 16 to achieve the perforating purpose. Forming a communication channel between the wellbore and the formation.
5.射开孔道后，泵车以排量2.0m3/min注入顶替液，将压裂管柱内携砂液替入地层，然后冲洗压裂管柱。5. After the opening of the tunnel, the pump truck injects the displacement liquid at a displacement of 2.0 m 3 /min, and the sand carrying liquid in the fracture column is replaced by the formation, and then the fracture column is washed.
6.冲洗完毕后，套管环空提高排量至3.6～4.0m3/min开始进行环空压裂，同时，压裂管柱内以排量1.0m3/min伴注平衡压力，按照施工设计要求压裂后，再以排量4.0m3/min注入顶替液，将压裂管柱中压裂液全部替入地层，以完成储层压裂改造。 6. After the flushing is completed, the casing annulus increases the displacement to 3.6~4.0m 3 /min to start the annulus fracturing. At the same time, the displacement of the pipe column is 1.0m 3 /min with the balance pressure, according to the construction. After the design requires fracturing, the displacement fluid is injected at a displacement of 4.0 m 3 /min, and the fracturing fluid in the fracturing column is completely replaced by the formation to complete the reservoir fracturing transformation.
7.待第一段射孔压裂完成后，井口上提管柱解封底封拖动压裂封隔器19，按照施工设计泵注程序上提至规定井深位置，释放悬重二次坐封底封拖动压裂封隔器19，然后依据上述水力射孔、压裂步骤继续完成第2段的喷射压裂施工。7. After the first stage of perforation fracturing is completed, the wellhead is unloaded and the bottom of the well is unloaded and dragged and flocked packer 19, and according to the construction design pumping procedure, it is lifted to the specified well depth position, and the suspended weight is placed twice. The fracturing packer 19 is dragged and the injection fracturing of the second stage is continued according to the hydraulic perforating and fracturing steps described above.
8.完成设计段数水力喷射压裂施工后，将压裂管柱起出井口，重新下入采油气管柱完井，装井口装置，并且及时拆卸、检查多个交替连接的油管和双螺旋短节到第n级双螺旋短节和上双螺旋短节12与下双螺旋短节15(检查外壁和双螺旋内腔)使用情况，用于保养或更换多个交替连接的油管和双螺旋短节到第n级双螺旋短节和上双螺旋短节12与下双螺旋短节15，以便后续再次进行水力喷射压裂施工。 8. After completing the design section number of hydraulic jet fracturing construction, the fracturing pipe string will be taken out of the wellhead, the oil and gas pipeline column completion will be re-introduced, the wellhead device will be installed, and multiple alternately connected oil pipes and double spiral short sections will be dismantled and inspected in time. To the use of the nth-stage double-spiral sub-segment and the upper double-coiled short 12 and the lower double-spiral sub-section 15 (inspecting the outer wall and the double-spiral inner cavity) for maintenance or replacement of a plurality of alternately connected tubing and double helix nipples The n-th stage double helix short section and the upper double helix short section 12 and the lower double helix short section 15 are used to perform the hydraulic jet fracturing construction again.

Claims (9)

  1. 有限级间断式双螺旋井底砂液混配管柱，其特征在于：包括从井口到井底依次连接的第一级油管(1)、和第n级油管(9)，所述第一级油管(1)与第n级油管(9)之间设置有多个双螺旋短节和油管，所述的双螺旋短节和油管交替连接；所述第n级油管(9)下端依次连接有上双螺旋短节(12)和上水力喷射器(13)，所述上水力喷射器(13)下端依次连接有下双螺旋短节(15)和下水力喷射器(16)，所述下水力喷射器(16)下端连接有伸缩补偿器(18)，所述伸缩补偿器(18)下端连接有底封拖动压裂封隔器(19)。A finite-stage intermittent double-spindle bottom sand mixed liquid pipe string, characterized in that: a first-stage oil pipe (1) and an n-th oil pipe (9) connected in sequence from a wellhead to a bottom of the well, the first-stage oil pipe (1) A plurality of double-spiral short joints and oil pipes are disposed between the n-th oil pipe (9), and the double-coil short joints and the oil pipes are alternately connected; the lower end of the n-th oil pipe (9) is connected in turn. a double helix short section (12) and an upper hydraulic ejector (13), the lower end of the upper hydraulic ejector (13) is sequentially connected with a lower double helix short section (15) and a lower hydraulic ejector (16), the lower hydraulic force A lower end of the injector (16) is connected with a telescopic compensator (18), and a lower end of the telescopic compensator (18) is connected with a bottom seal drag fracturing packer (19).
  2. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述上双螺旋短节(12)与第n级油管(9)之间连接有上调整短节(11)，所述上调整短节(11)与第n级油管(9)通过安全接头(10)连接。The finite-stage intermittent double-helix bottom-hole sand-mixing pipe column according to claim 1, wherein the connection between the upper double-spiral short section (12) and the n-th stage oil pipe (9) is shortly adjusted. Section (11), the upper adjustment stub (11) is connected to the nth stage oil pipe (9) through a safety joint (10).
  3. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述下双螺旋短节(15)与上水力喷射器(13)之间通过下调整短节(14)连接。The finite-stage intermittent double-spindle bottom sand sand mixing pipe column according to claim 1, wherein the lower double-spiral short joint (15) and the upper hydraulic sprayer (13) are adjusted by a lower adjustment joint (14) Connection.
  4. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述下水力喷射器(16)与伸缩补偿器(18)之间设置有单流阀(17)。The finite-stage intermittent double-spindle bottom sand sand mixing pipe column according to claim 1, wherein a single flow valve (17) is disposed between the lower hydraulic injector (16) and the telescopic compensator (18). ).
  5. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述的第一级油管(1)和第n级油管(9)结构相同，均为Φ73mm油管。The finite-stage intermittent double-spindle bottom sand mixing pipe column according to claim 1, wherein the first-stage oil pipe (1) and the n-th oil pipe (9) have the same structure, and both are Φ73 mm oil pipes. .
  6. 根据权利要求2或3所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述的上调整短节(11)和下调整短节(14)结构相同，均为Φ73mm调整短节。The finite-stage intermittent double-helix bottom sand mixing pipe column according to claim 2 or 3, wherein the upper adjusting short section (11) and the lower adjusting short section (14) have the same structure, Φ73mm adjustment short section.
  7. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：上述多个双螺旋短节长度均为2500mm，外径80mm，内径40mm，螺旋线沿顺时针方向，螺旋角45°，双螺旋螺距120mm，双螺旋线间距30mm。The finite-stage intermittent double-spindle bottom sand mixing pipe column according to claim 1, wherein the plurality of double-spiral short joints each have a length of 2500 mm, an outer diameter of 80 mm, an inner diameter of 40 mm, and a spiral line in a clockwise direction. The helix angle is 45°, the double helix pitch is 120 mm, and the double helix line spacing is 30 mm.
  8. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述的多个双螺旋短节内设有螺旋梯形槽，其螺旋梯形槽长120mm，槽深5mm，槽底部宽度10mm，梯形角60°，所述的螺旋梯形槽内镀有抗耐磨材料。The finite-stage intermittent double-spindle bottom sand sand mixing pipe column according to claim 1, wherein the plurality of double spiral short sections are provided with a spiral trapezoidal groove, and the spiral trapezoidal groove length is 120 mm, and the groove depth is 5mm, the bottom of the groove has a width of 10mm and a trapezoidal angle of 60°, and the spiral trapezoidal groove is plated with a wear-resistant material.
  9. 根据权利要求1所述的有限级间断式双螺旋井底砂液混配管柱，其特征在于：所述第一级油管(1)与第n级油管(9)之间设置有4个双螺旋短节和4个 油管，所述的双螺旋短节和油管交替连接；第一级油管(1)与第n级油管(9)之间依次连接有第一级双螺旋短节(2)、第二级油管(3)、第二级双螺旋短节(4)，第三级油管(5)、第三级双螺旋短节(6)、第四级油管(7)、第四级双螺旋短节(8)。 The finite-stage discontinuous double helix bottom sand mixing pipe column according to claim 1, wherein four double helixes are arranged between the first-stage oil pipe (1) and the n-th oil pipe (9); Short section and 4 The oil pipe, the double spiral short section and the oil pipe are alternately connected; a first stage double spiral short section (2) and a second stage oil pipe are sequentially connected between the first stage oil pipe (1) and the nth stage oil pipe (9) ( 3), second-stage double-coiled short section (4), third-stage oil pipe (5), third-stage double-coil short section (6), fourth-stage oil pipe (7), fourth-stage double-coil short section (8 ).
PCT/CN2016/099268 2016-08-30 2016-09-19 Limited-stage discontinuous and dual-spiral string for mixture of sand and liquid at well bottom WO2018040139A1 (en)

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