WO2018040138A1 - 一种水平井体积压裂用螺旋式双层分流油管 - Google Patents

一种水平井体积压裂用螺旋式双层分流油管 Download PDF

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WO2018040138A1
WO2018040138A1 PCT/CN2016/099267 CN2016099267W WO2018040138A1 WO 2018040138 A1 WO2018040138 A1 WO 2018040138A1 CN 2016099267 W CN2016099267 W CN 2016099267W WO 2018040138 A1 WO2018040138 A1 WO 2018040138A1
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double
spiral
horizontal well
pipe
tube
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PCT/CN2016/099267
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English (en)
French (fr)
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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 WO2018040138A1 publication Critical patent/WO2018040138A1/zh

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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings

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  • the invention relates to a spiral double-layer split flow pipe for horizontal well volume fracturing, which is mainly suitable for horizontal well volume fracturing multi-stage double-cluster injection fracturing construction pipe string.
  • the horizontal well volume fracturing technology is currently the mainstream transformation mode for the increase and storage of Changqing Oilfield. Due to the high pump pressure, large displacement, large liquid volume and large sand volume flow, the sand-carrying fluid is prone to sand deposition in the horizontal section.
  • the invention improves the sand concentration, flow rate and pressure at the upper spray gun in the horizontal well fracturing multi-stage double-cluster perforation fracturing column by adopting "double pipe + inner pipe outer spiral structure", and enters the upper spray gun as much as possible
  • the sand and flow at the place are too long to ensure that most of the sand-carrying liquid enters the upper spray gun, reducing the probability of excessive sand accumulation at the lower spray gun and the liquid flow rate, thereby causing the horizontal well volume to fracturing the multi-stage double-cluster perforating pressure.
  • the effects of blasting and perforating of the spray guns on the upper and lower sides of the spray are balanced, which solves the problem of sand deposition, sand separation and horizontal and vertical perforation of the upper and lower spray guns in the horizontal wells.
  • the utility model provides a spiral double-layer splitting oil pipe for horizontal well volume fracturing, so that a large liquid volume and a high flow rate sand carrying liquid enter the upper spray gun cavity in a state of swirling and diverting, thereby improving multi-level double shower of horizontal wells. Hole fracturing construction efficiency And security.
  • a spiral double-layer split oil pipe for horizontal well volume fracturing comprising an outer pipe and an inner pipe, the inner pipe is sleeved in the outer pipe, a cavity is formed between the inner pipe and the outer pipe, and two ends of the inner pipe
  • the upper and lower couplings are respectively connected to the outer tube; the outer surface of the inner tube is provided with a double spiral flow path.
  • the double spiral flow passage provided on the outer surface of the inner tube has a spiral trapezoidal groove shape.
  • the spiral trapezoidal groove has a depth of 4.5 mm, a groove bottom width of 12 mm, and a trapezoidal angle of 60°.
  • the inner tube steel material is made of 35CrMo material, and the inner tube is provided with a heat treatment surface of the double spiral flow path and then treated by a nitriding process, so that the hardness reaches 70-92HRC.
  • the inner tube is provided with an outer surface of the double helix flow passage treated by a nitriding process, and the nitriding layer has a thickness of 0.6 mm.
  • the outer tube steel is made of P110 material and has a hardness of 650-835HB.
  • the upper coupling and the lower coupling have the same structure, and the buckle type is 3-1/2" UP TBG.
  • the outer tube has an outer diameter of 88.9 mm, an inner diameter of 76 mm, an inner tube outer diameter of 59 mm, and an inner diameter of 38 mm.
  • the invention provides a spiral double-layer splitting oil pipe for horizontal well volume fracturing, which improves the horizontal well volume fracturing multi-stage double-cluster perforation fracturing column by adopting "double pipe + inner pipe outer spiral structure"
  • the sand concentration, flow rate and pressure at the middle and upper spray guns should make the sand and liquid flow entering the upper spray gun stay as long as possible, ensuring that most of the sand carrying liquid enters the upper spray gun, reducing the accumulation of excessive sand at the lower spray gun.
  • Figure 1 is a schematic view of a spiral double-layer splitter for horizontal well volume fracturing.
  • Figure 2 is a schematic view of the A-A structure.
  • the invention improves the sand concentration, flow rate and pressure at the upper spray gun in the horizontal well fracturing multi-stage double-cluster perforation fracturing column by adopting "double pipe + inner pipe outer spiral structure", and enters the upper spray gun as much as possible
  • the sand and flow at the place are too long to ensure that most of the sand-carrying liquid enters the upper spray gun, reducing the probability of excessive sand accumulation at the lower spray gun and the liquid flow rate, thereby causing the horizontal well volume to fracturing the multi-stage double-cluster perforating pressure.
  • the effects of blasting and perforating of the spray guns on the upper and lower sides of the spray are balanced, which solves the problem of sand deposition, sand separation and horizontal and vertical perforation of the upper and lower spray guns in the horizontal wells.
  • the utility model provides a spiral double-layer splitter oil pipe for horizontal well volume fracturing as shown in FIG. 1 and 2, so that a large liquid volume and a high flow rate sand carrying liquid enter the upper spray gun cavity in a state of swirling and diverting. Improve the efficiency and safety of multi-stage double-cluster perforation fracturing in horizontal wells.
  • a spiral double-layer split oil pipe for horizontal well volume fracturing comprising an outer pipe 2 and an inner pipe 3, the inner pipe 3 is sleeved in the outer pipe 2, and a form is formed between the inner pipe 3 and the outer pipe 2 a cavity, the two ends of the inner tube 3 are respectively connected to the outer tube 2 through the upper coupling 1 and the lower coupling 4;
  • the outer surface of the inner tube 3 is provided with a double helix flow path.
  • the application mode of the invention is:
  • the spiral double-layer diverting oil pipe is installed on the upstream of the spray gun of the double-cluster injection fracturing pipe column, and assembled. Connect the multi-stage drag double-cluster jet fracturing string.
  • the multi-stage drag double-cluster injection fracturing column is lowered into the predetermined spray point position of the upper and lower spray guns.
  • the above-mentioned multi-stage drag double-cluster injection fracturing pipe string enters the well, the pitching ball, and the hydraulic setting packer are anchored in place, and the fracturing pump car is used to wash the well with a displacement of 0.8-1.0 m 3 /min clear water to ensure the circulation.
  • the liquid mechanical impurity content of the liquid outlet in the ground mud pool is less than 0.22%, and the wellbore is clean and clean.
  • the sand carrying liquid When the volume and high flow rate of the sand carrying liquid flows through the horizontal section spiral double-layer split oil pipe, the sand carrying liquid is branched into two parts, one part flows through the inner diameter of the inner pipe 3, and the other part flows from the inner pipe 3 and the outer pipe 2
  • the space flows through, because the outer surface of the inner tube 3 is designed with a double spiral trapezoidal groove structure, so that the sand-carrying state of this part of the sand-carrying fluid is generated, and a spiral flow state is formed in the annular space, taking into account that the swirling and shunting effects are delayed.
  • the sand carrying liquid of the upper spray gun is increased, and the lower spray gun still has enough sand carrying liquid, thereby achieving the purpose of multi-stage drag double-cluster jet fracturing on the upper and lower spray guns simultaneously, and forming a double perforation channel connecting the wellbore and the ground layer. .
  • the pump truck injects the displacement liquid with a displacement of 2.0 m 3 /min, and the sand pumped liquid in the multi-stage drag double-cluster injection fracturing 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 multi-stage drag double-cluster injection fracturing column is replaced by the formation to complete the reservoir fracturing transformation.
  • the injection fracturing pipe string is proposed, and the use of the spiral double-layer diverting oil pipe (including the inner wall of the outer pipe and the inner and outer walls of the inner pipe) is disassembled and inspected in time. Maintenance or replacement of the spiral double-layer splitter for subsequent multi-stage double-cluster injection fracturing.
  • the invention relates to the technical field of horizontal well volume fracturing technology, and is an important tool for realizing horizontal well volume fracturing bottom sand remixing and large liquid amount diversion, and changing the double cluster perforation fracturing into the horizontal section of the horizontal well.
  • the flow rate, sand concentration and pressure of the spray gun make the sand concentration and flow rate entering the upper spray gun as large as possible, ensuring normal perforation and subsequent fracturing, and at the same time reducing the probability and liquid of excessive sand accumulation at the lower spray gun.
  • Flow rate, suitable for horizontal well volume fracturing multi-stage double-cluster injection fracturing string are examples of the flow rate, and flow rate entering the upper spray gun.
  • the double spiral flow path provided on the outer surface of the inner tube 3 has a spiral trapezoidal groove shape.
  • the spiral trapezoidal groove has a depth of 4.5 mm, a groove bottom width of 12 mm, and a trapezoidal angle of 60°.
  • the inner tube 3 is made of 35CrMo material, and the inner tube 3 is provided with a heat treatment surface of the double spiral flow path and then treated by a nitriding process, so that the hardness reaches 70-92HRC.
  • the inner surface of the inner tube 3 provided with the double spiral flow path is treated by a nitriding process, and the thickness of the nitrided layer is 0.6 mm.
  • the outer tube 2 steel material is made of P110 material and has a hardness of 650-835HB.
  • the outer tube 2 has an outer diameter of 88.9 mm, an inner diameter of 76 mm, an inner tube 3 outer diameter of 59 mm, and an inner diameter of 38 mm.
  • the length of the oil pipe provided by the invention is 9200mm, the outer diameter of the outer pipe 2 is 88.9mm, the inner diameter is 76mm, the outer diameter of the inner pipe 3 is 59mm, the inner diameter is 38mm, the double spiral of the inner pipe 3 is in the clockwise direction, the helix angle is 45°, and the double helical pitch is 135mm.
  • the double spiral spacing is 32mm, the spiral trapezoidal groove is 135mm, the groove depth is 4.5mm, the groove bottom width is 12mm, and the trapezoidal angle is 60°.
  • the outer tube 2 of the spiral double-layer splitter for horizontal well volume fracturing is made of P110 material, and the heat treatment hardness is 650-835HB; the inner tube 3 steel is made of 35CrMo material, and the hardness is heat treated.
  • the outer surface of the inner tube 3 is provided with a double spiral trapezoidal groove structure, and the outer surface of the inner tube 3 is treated by a nitriding process, the thickness of the nitriding layer is 0.6 mm, the hardness is as high as 70-92HRC, and the wear resistance is high.
  • the double spiral trapezoidal groove processing of the inner tube 3 of the oil pipe does not allow defects such as cracks and pores, and the spiral transition is smooth and smooth.
  • the upper coupling 1 and the lower coupling 4 are identical in structure, and the buckle type is 3-1/2" UP TBG.
  • the connection mode of the present invention is a tubing coupling connection for easy disassembly and replacement.
  • the application mode of the invention is:
  • the oil horizontal well is subjected to volume fracturing multi-stage drag double-cluster injection fracturing before construction.
  • the spiral double-layer diverting oil pipe is installed in the double-cluster injection fracturing pipe.
  • the multi-stage drag double-cluster injection fracturing column is assembled and connected.
  • the multi-stage drag double-cluster injection fracturing column is lowered into the predetermined spray point position of the upper and lower spray guns.
  • the pump truck injects the displacement liquid with a displacement of 2.0 m 3 /min, and the sand pumped liquid in the multi-stage drag double-cluster injection fracturing 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 multi-stage drag double-cluster injection fracturing column is replaced by the formation to complete the reservoir fracturing transformation.
  • the injection fracturing pipe string is proposed, and the use of the spiral double-layer diverting oil pipe (including the inner wall of the outer pipe and the inner and outer walls of the inner pipe) is disassembled and inspected in time. Maintenance or replacement of the spiral double-layer splitter for subsequent multi-stage double-cluster injection fracturing

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Abstract

一种水平井体积压裂用螺旋式双层分流油管,包括外管(2)和内管(3),所述内管(3)套接于外管(2)内,所述内管(3)与外管(2)之间形成一个空腔,内管(3)两端分别通过上接箍(1)和下接箍(4)与外管(2)连接;所述内管(3)的外表面设有双螺旋线流道。通过采用双层管+内管外螺旋结构来改善水平井体积压裂多级双簇射孔压裂管柱中上喷枪处的砂浓度、流量和压力,降低下喷枪处过多砂子聚集的概率和流量,有效地解决了目前水平井水平段砂子沉积、砂液分离问题和多级双簇射孔压裂管柱中上、下游喷枪射孔的不均匀性,提高了水平井多级拖动双簇喷射压裂施工成功率。

Description

一种水平井体积压裂用螺旋式双层分流油管 技术领域
本发明涉及一种水平井体积压裂用螺旋式双层分流油管,主要适用于水平井体积压裂多级双簇喷射压裂施工管柱中。
背景技术
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模式,由于高泵压、大排量、大液量、大砂量流体流动下,携砂液在水平段容易出现砂子沉积、砂液分离现象,加之砂液运动的惯性作用,大液量会将砂子沿着水平段管柱尽可能带入下喷枪,从而降低了上喷枪喷嘴处的砂浓度、流量和压力,造成了上喷枪喷砂射孔失败或下喷枪提前冲蚀失效,不利于多级双簇射孔,严重影响了体积压裂施工效果。为此,设计了一种水平井体积压裂用螺旋式双层分流油管。
发明内容
本发明通过采用“双层管+内管外螺旋结构”来改善水平井体积压裂多级双簇射孔压裂管柱中上喷枪处的砂浓度、流量和压力,尽可能使进入上喷枪处的砂子、流量停留的时间过长一些,保证大多数携砂液进入上喷枪,降低下喷枪处过多砂子聚集的概率和液流量,从而使水平井体积压裂多级双簇射孔压裂上、下游喷枪喷砂射孔效果均衡,解决目前水平井水平段砂子沉积、砂液分离问题和多级双簇射孔压裂管柱中上、下游喷枪射孔的不均匀性。本发明提供的一种水平井体积压裂用螺旋式双层分流油管,使大液量、高流速携砂液以旋流和分流的状态进入上喷枪内腔,提高水平井多级双簇射孔压裂施工效率 和安全性。
本发明采用的技术方案为:
一种水平井体积压裂用螺旋式双层分流油管,包括外管和内管,所述内管套接于外管内,所述内管与外管之间形成一个空腔,内管两端分别通过上接箍和下接箍与外管连接;所述内管的外表面设有双螺旋线流道。
所述内管的外表面设有的双螺旋线流道形状为螺旋梯形槽。
所述螺旋梯形槽槽深4.5mm,槽底部宽度12mm,梯形角60°
所述内管钢材采用35CrMo材料,所述内管设有双螺旋线流道的外表面热处理后通过渗氮工艺处理,使得其硬度达到70~92HRC。
所述内管设有双螺旋线流道的外表面通过渗氮工艺处理,其渗氮层厚度0.6mm。
所述外管钢材采用P110材料,其硬度为650~835HB。
所述的上接箍和下接箍结构相同,其扣型为3-1/2"UP TBG。
所述外管外径88.9mm,内径76mm,内管外径59mm,内径38mm。
本发明的有益效果为:
本发明提供的了一种水平井体积压裂用螺旋式双层分流油管,通过采用“双层管+内管外螺旋结构”来改善水平井体积压裂多级双簇射孔压裂管柱中上喷枪处的砂浓度、流量和压力,尽可能使进入上喷枪处的砂子、液流量停留的时间过长一些,保证大多数携砂液进入上喷枪,降低下喷枪处过多砂子聚集的概率和液流量,实现了水平井体积压裂多级双簇射孔压裂上、下游喷枪喷砂射孔效果均衡,达到了水 平段井底砂液重新混配和多级双簇射孔压裂上、下游喷枪同时射孔的目的,实用性强,效果显著。
以下将结合附图进行进一步的说明。
附图说明
图1为一种水平井体积压裂用螺旋式双层分流油管示意图。
图2为A-A结构示意图。
图中:1-上接箍;2-外管;3-内管;4-下接箍。
具体实施方式
实施例1:
本发明通过采用“双层管+内管外螺旋结构”来改善水平井体积压裂多级双簇射孔压裂管柱中上喷枪处的砂浓度、流量和压力,尽可能使进入上喷枪处的砂子、流量停留的时间过长一些,保证大多数携砂液进入上喷枪,降低下喷枪处过多砂子聚集的概率和液流量,从而使水平井体积压裂多级双簇射孔压裂上、下游喷枪喷砂射孔效果均衡,解决目前水平井水平段砂子沉积、砂液分离问题和多级双簇射孔压裂管柱中上、下游喷枪射孔的不均匀性。本发明提供的如图1和2所示的一种水平井体积压裂用螺旋式双层分流油管,使大液量、高流速携砂液以旋流和分流的状态进入上喷枪内腔,提高水平井多级双簇射孔压裂施工效率和安全性。
一种水平井体积压裂用螺旋式双层分流油管,包括外管2和内管3,所述内管3套接于外管2内,所述内管3与外管2之间形成一个空腔,内管3两端分别通过上接箍1和下接箍4与外管2连接;所述 内管3的外表面设有双螺旋线流道。
本发明的应用方式为:
1.首先油水平井进行体积压裂多级拖动双簇喷射压裂施工前,根据施工管柱结构图,将螺旋式双层分流油管安装在双簇喷射压裂管柱上喷枪的上游,组装连接好多级拖动双簇喷射压裂管柱。
2.将上述多级拖动双簇喷射压裂管柱下入到上、下游喷枪预定的喷点位置。
3.上述多级拖动双簇喷射压裂管柱入井,投球,液压坐封封隔器锚定到位后,利用压裂泵车以排量0.8~1.0m3/min清水循环洗井,保证地面泥浆池中出液口液体机械杂质含量小于0.22%,井筒清洁干净。
4.然后提高压裂泵车排量至1.0~2.0m3/min,将砂浓度为145~160kg/m3携砂液沿多级拖动双簇喷射压裂管柱泵入,当大液量、高流速携砂液流经水平段螺旋式双层分流油管时,携砂液分流成两部分,一部分从内管3的内通径流过,另一部分从内管3和外管2的环形空间流过,由于内管3的外表面设计有双螺旋梯形槽结构,从而使这一部分的携砂液产生螺旋式流动状态,在环形空间形成螺旋流态,考虑到旋流和分流作用延迟了大液量、高流速携砂液流经上喷枪的时间,进而在该油管下游出口和上喷枪之间的很短距离区域,携砂液汇集停留的时间很大程度地延长,从而确保了进入上喷枪的携砂液增多,下喷枪仍然有足够的携砂液,从而达到了多级拖动双簇喷射压裂上、下游喷枪同时射孔的目的,形成井筒与地层连通的双射孔通道。
5.射开孔道后,泵车以排量2.0m3/min注入顶替液,将多级拖动双簇喷射压裂管柱内携砂液替入地层,然后冲洗压裂管柱。
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,将多级拖动双簇喷射压裂管柱中压裂液全部替入地层,以完成储层压裂改造。
7.待油水平井多级拖动双簇喷射压裂施工完成后,上提出喷射压裂管柱,及时拆卸、检查螺旋式双层分流油管(含外管内壁、内管内外壁)使用情况,用于保养或更换螺旋式双层分流油管,以便后续再次进行多级双簇喷射压裂施工。
本发明涉及到水平井体积压裂工艺技术领域,是实现水平井体积压裂井底砂液重新混配、大液量分流的重要工具,改变了进入水平井水平段双簇射孔压裂上喷枪的流量、砂浓度、压力,从而使进入上喷枪处的砂浓度、流量尽可能大一点,保证其正常射孔及后续压裂,同时,降低了下喷枪处过多砂子聚集的概率和液流量,适合应用于水平井体积压裂多级双簇喷射压裂管柱中。
实施例2:
基于实施例1的基础上,本实施例中如图2所示,所述内管3的外表面设有的双螺旋线流道形状为螺旋梯形槽。
所述螺旋梯形槽槽深4.5mm,槽底部宽度12mm,梯形角60°
所述内管3钢材采用35CrMo材料,所述内管3设有双螺旋线流道的外表面热处理后通过渗氮工艺处理,使得其硬度达到70~92HRC。
所述内管3设有双螺旋线流道的外表面通过渗氮工艺处理,其渗氮层厚度0.6mm。
所述外管2钢材采用P110材料,其硬度为650~835HB。
所述外管2外径88.9mm,内径76mm,内管3外径59mm,内径38mm。
本发明提供的该油管长度9200mm,外管2外径88.9mm,内径76mm,内管3外径59mm,内径38mm,内管3双螺旋线沿顺时针方向,螺旋角45°,双螺旋螺距135mm,双螺线间距32mm,螺旋梯形槽135mm,槽深4.5mm,槽底部宽度12mm,梯形角60°。
如图1,本发明涉及的一种水平井体积压裂用螺旋式双层分流油管的外管2钢材采用P110材料,经热处理硬度达650~835HB;内管3钢材采用35CrMo材料,经热处理硬度达197~235HB,内管3的外表面设有双螺旋梯形槽结构,并采用渗氮工艺处理内管3的外表面,渗氮层厚度0.6mm,其硬度高达70~92HRC,耐磨性高,以避免分流后的部分携砂液由于流向的改变而造成内管3外表面双螺旋梯形槽的局部冲刷。
该油管的内管3的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。
所述的上接箍1和下接箍4结构相同,其扣型为3-1/2"UP TBG。本发明的连接方式为油管接箍连接,以便于拆卸和更换。
本发明的应用方式为:
1.首先油水平井进行体积压裂多级拖动双簇喷射压裂施工前,根据施工管柱结构图,将螺旋式双层分流油管安装在双簇喷射压裂管 柱上喷枪的上游,组装连接好多级拖动双簇喷射压裂管柱。
2.将上述多级拖动双簇喷射压裂管柱下入到上、下游喷枪预定的喷点位置。
3.上述多级拖动双簇喷射压裂管柱入井,投球,液压坐封封隔器锚定到位后,利用700型压裂泵车以排量0.8~1.0m3/min清水循环洗井,保证地面泥浆池中出液口液体机械杂质含量小于0.22%,井筒清洁干净。
4.然后提高700型压裂泵车排量至1.0~2.0m3/min,将砂浓度为145~160kg/m3携砂液沿多级拖动双簇喷射压裂管柱泵入,当大液量、高流速携砂液流经水平段螺旋式双层分流油管时,携砂液分流成两部分,一部分从内管3的内通径流过,另一部分从内管3和外管2的环形空间流过,由于内管3的外表面设计有双螺旋梯形槽结构,从而使这一部分的携砂液产生螺旋式流动状态,在环形空间形成螺旋流态,考虑到旋流和分流作用延迟了大液量、高流速携砂液流经上喷枪的时间,进而在该油管下游出口和上喷枪之间的很短距离区域,携砂液汇集停留的时间很大程度地延长,从而确保了进入上喷枪的携砂液增多,下喷枪仍然有足够的携砂液,从而达到了多级拖动双簇喷射压裂上、下游喷枪同时射孔的目的,形成井筒与地层连通的双射孔通道。
5.射开孔道后,泵车以排量2.0m3/min注入顶替液,将多级拖动双簇喷射压裂管柱内携砂液替入地层,然后冲洗压裂管柱。
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,将多级拖动双簇喷射压裂管柱中压裂液全部替入地层,以完成储层压裂改造。
7.待油水平井多级拖动双簇喷射压裂施工完成后,上提出喷射压裂管柱,及时拆卸、检查螺旋式双层分流油管(含外管内壁、内管内外壁)使用情况,用于保养或更换螺旋式双层分流油管,以便后续再次进行多级双簇喷射压裂施工

Claims (8)

  1. 一种水平井体积压裂用螺旋式双层分流油管,其特征在于:包括外管(2)和内管(3),所述内管(3)套接于外管(2)内,所述内管(3)与外管(2)之间形成一个空腔,内管(3)两端分别通过上接箍(1)和下接箍(4)与外管(2)连接;所述内管(3)的外表面设有双螺旋线流道。
  2. 根据权利要求1所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述内管(3)的外表面设有的双螺旋线流道形状为螺旋梯形槽。
  3. 根据权利要求2所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述螺旋梯形槽槽深4.5mm,槽底部宽度12mm,梯形角60°
  4. 根据权利要求1所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述内管(3)钢材采用35CrMo材料,所述内管(3)设有双螺旋线流道的外表面热处理后通过渗氮工艺处理,使得其硬度达到70~92HRC。
  5. 根据权利要求4所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述内管(3)设有双螺旋线流道的外表面通过渗氮工艺处理,其渗氮层厚度0.6mm。
  6. 根据权利要求1所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述外管(2)钢材采用P110材料,其硬度为650~835HB。
  7. 根据权利要求1所述一种水平井体积压裂用螺旋式双层分流油 管,其特征在于:所述的上接箍(1)和下接箍(4)结构相同,其扣型为3-1/2"UP TBG。
  8. 根据权利要求1所述一种水平井体积压裂用螺旋式双层分流油管,其特征在于:所述外管(2)外径88.9mm,内径76mm,内管(3)外径59mm,内径38mm。
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