WO2013060270A1 - 水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法 - Google Patents

水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法 Download PDF

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WO2013060270A1
WO2013060270A1 PCT/CN2012/083425 CN2012083425W WO2013060270A1 WO 2013060270 A1 WO2013060270 A1 WO 2013060270A1 CN 2012083425 W CN2012083425 W CN 2012083425W WO 2013060270 A1 WO2013060270 A1 WO 2013060270A1
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oil
water
well
sieve
permeable
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PCT/CN2012/083425
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English (en)
French (fr)
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王胜存
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Wang Shengcun
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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
    • E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • 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
    • E21B43/02—Subsoil filtering
    • E21B43/04—Gravelling of wells
    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons

Definitions

  • the invention belongs to oil exploitation, and particularly relates to a method for producing oil through a horizontal well pressure crack filled with Fusheng sand to establish an oil-permeable water-blocking screen.
  • the present invention is directed to overcoming the deficiencies of the prior art, and provides a method for producing oil through a horizontal well pressure crack filled with Fusheng sand to establish an oil permeable water blocking screen.
  • the horizontal well pressure crack of the present invention is filled with Fusheng sand to establish an oil-permeable water-blocking screen oil production method, which is a vertical perforation of a horizontal well between the water injection well row and the production well row and is fractured, and is filled in the fracture gap.
  • Fusheng sand with oil-permeable and water-blocking function is used as a proppant to establish an oil-permeable water-blocking sieve to filter the oil-water mixture.
  • the vertical well perforating and fracturing is to drill a horizontal well in a direction perpendicular to the minimum geostress of the oil layer between the water injection well row and the production well row, and vertically scatter it Fracturing after the hole.
  • the oil-permeable water-blocking screen is filled with Fusheng sand in a vertical horizontal crack of a horizontal well, and the oil-permeable water-blocking screen separates the original oil exploitation area into a water injection area and an oil production area.
  • the water injection pressure when the oil-water mixture passes through the sieve, the crude oil is accumulated in the oil recovery zone through the sieve, and the water is trapped in the water injection zone; after all the oil in the water injection zone passes through the sieve and enters the oil recovery zone, the water is injected because there is no crude oil passing through the sieve.
  • the water injection pressure in the area suddenly increased, causing the sieve to be broken down into a permeable screen, and the water that passed through continued to push the remaining oil in the oil recovery area to be driven to the oil well.
  • Figure 1 is a cross-sectional view showing the establishment of a oil-permeable water-blocking screen in the oil layer and the first-stage production process.
  • Figure 2 is a cross-sectional view of the oil-permeable water-blocking screen and the second-stage production process in the oil layer.
  • Figure 3 is a cross-sectional view of the oil-permeable water-blocking screen and the third-stage production process in the oil layer.
  • Figure 4 is a plan view of the oil-permeable water-blocking screen and the first stage production process.
  • Figure 5 is a vertical crack diagram of a vertical perforation perpendicular to the horizontal minimum stress level.
  • Figure 6 shows the layout of the horizontal well in the northeast to southwest direction of the five-point well pattern network.
  • Figure 7 shows the layout of the horizontal well in the northwest to southeast direction.
  • Figure 8 shows the layout of the horizontal well in the north-south direction of the five-point well pattern network.
  • Figure 9 shows the layout of the horizontal well in the east-west direction of the five-point well pattern network.
  • the oil-permeable water-blocking screen of the present invention injects Fusheng sand into vertical vertical cracks of horizontal wells, and the oil-permeable water-blocking screen divides the original oil exploitation area into a water injection area and an oil production area, and is driven by water injection pressure.
  • the oil-water mixture passes through the sieve, the crude oil is accumulated in the oil recovery zone through the sieve, and the water is trapped in the water injection zone; after all the oil in the water injection zone passes through the sieve and enters the oil recovery zone, since no crude oil passes through the sieve, the water injection pressure of the water injection zone is made.
  • the sieve is broken down into a permeable screen, and the water that passes through continues to push the remaining oil in the production area to the well to be produced, as shown in Figure 1.
  • the spread shape of the oil-permeable water-blocking screen in the oil layer is completely controlled by the horizontal well crack.
  • the horizontal section of the horizontal well In order to make the sieve in the oil layer perpendicular to the direction of the water flow, the horizontal section of the horizontal well must only carry out the vertical perforation, and the horizontal section should be as perpendicular as possible to the horizontal minimum stress direction of the formation, as shown in Fig. 5. Shown.
  • Most well networks are five-point area well nets.
  • the horizontal section of the horizontal well is perpendicular to the direction of the minimum horizontal geostress, taking Daqing Oilfield as an example, there are four layout directions for the horizontal section. For details, see Figure 6 to Figure 9, where the north-south and east-west directions are required.
  • the five-point well pattern is changed to the row well network, while the diagonal well is not required to adjust the well pattern.
  • the principle chosen for the four layouts is to ensure that the horizontal section is perpendicular to the horizontal minimum stress, so that the pressure crack meets the requirements for laying the screen surface.
  • the specific size and size of the screen surface should be determined in accordance with the local geological conditions.
  • the length of the screen surface is generally the same as the length of the horizontal section.
  • the maximum length of the current horizontal section in China has reached 2800m; the height of the screen surface should be consistent with the thickness of a single main oil layer, or Consistent with the total thickness of the multi-layer sandstone.
  • the horizontal well pressure crack of the invention is filled with Fusheng sand to establish an oil-permeable water-blocking screen oil production method, which is characterized in that the horizontal wells are vertically perforated and fractured between the water injection well row and the production well row, in the fracture gap
  • the Fusheng sand with oil-permeable and water-blocking function is filled as a proppant, and an oil-permeable water-blocking sieve is built to filter the oil-water mixture.
  • the horizontal vertical fracturing of the present invention is to drill a horizontal well in a direction perpendicular to the minimum geostress of the oil layer between the water injection well row and the production well row, and fracturing it after the vertical dense perforation.
  • the oil-permeable water-blocking screen of the present invention injects Fusheng sand into vertical vertical cracks of horizontal wells, and the oil-permeable water-blocking screen divides the original oil exploitation area into a water injection area and an oil production area, and is driven by water injection pressure.
  • the oil-water mixture passes through the sieve, the crude oil is accumulated in the oil recovery zone through the sieve, and the water is trapped in the water injection zone; after all the oil in the water injection zone passes through the sieve and enters the oil recovery zone, since no crude oil passes through the sieve, the water injection pressure of the water injection zone is made.
  • the sieve is broken down into a permeable screen, and the water that passes through continues to push the remaining oil in the production area to the well to be produced, as shown in Figure 1.
  • the spread shape of the oil-permeable water-blocking screen in the oil layer is completely controlled by the horizontal well crack.
  • the horizontal section of the horizontal well In order to make the sieve in the oil layer perpendicular to the direction of the water flow, the horizontal section of the horizontal well must only carry out the vertical perforation, and the horizontal section should be as perpendicular as possible to the horizontal minimum stress direction of the formation, as shown in Fig. 5. Shown.
  • Most well networks are five-point area well nets.
  • the horizontal section of the horizontal well is perpendicular to the direction of the minimum horizontal geostress, taking Daqing Oilfield as an example, there are four layout directions for the horizontal section. For details, see Figure 6 to Figure 9, where the north-south and east-west directions are required.
  • the five-point well pattern is changed to the row well network, while the diagonal well is not required to adjust the well pattern.
  • the principle chosen for the four layouts is to ensure that the horizontal section is perpendicular to the horizontal minimum stress, so that the pressure crack meets the requirements for laying the screen surface.
  • the specific size and size of the screen surface should be determined in accordance with the local geological conditions.
  • the length of the screen surface is generally the same as the length of the horizontal section.
  • the maximum length of the current horizontal section in China has reached 2800m; the height of the screen surface should be consistent with the thickness of a single main oil layer, or Consistent with the total thickness of the multi-layer sandstone.
  • the horizontal well pressure crack of the invention is filled with Fusheng sand to establish an oil-permeable water-blocking screen oil production method, which overcomes the defects of the existing Fusheng sand under high driving pressure, and fully exerts the super-strong water blocking function of the low-pressure driving.
  • the vertical fracture of the horizontal well between the injection well and the production well is filled with Fusheng sand with oil and water blocking function to build a water and water
  • the mixture is filtered through a sieve which separates the production zone into a water injection zone and a production zone.
  • the estimated value of the pressure difference on both sides of the sieve during the production process is only 0.0025 MPa, which can fully utilize the strict water-blocking function of the Fusheng sand when driving at low pressure, so that the oil accumulates through the sieve on the side of the oil recovery zone of the sieve.
  • the water is trapped in the water injection zone. After all the remaining oil in the water injection zone enters the oil recovery zone, the pressure in the water injection zone will suddenly rise due to the absence of crude oil passing through the sieve, so that the sieve becomes a water permeable sieve, and the water passing through the sieve continues to push the oil in the oil recovery zone into the production well.
  • the original injection well should be changed to the production well and the original production well to the injection well, that is, the original production area becomes the water injection area, and the original water injection area is changed to the oil production area.
  • the remaining oil in the oil recovery zone is reversely transmitted through the sieve to the other side of the sieve.
  • the injection well is stopped, and the oil well is changed to the injection well and the horizontal well is changed to the production well, so that the oil accumulated on the screen surface enters the horizontal well through the pressure crack under the pressure of water injection and is taken out.
  • the conversion between the water injection zone and the oil recovery zone changes the direction of the liquid flow through the sieve, thereby realizing the effect of the sieve moving left and right in the oil layer, and finally the remaining oil on both sides is filtered and produced, so that the recovery rate is close to 100. %.

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Abstract

水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，在注水井排和采油井排中间的水平井垂向压裂缝内填充一种具有透油阻水功能的孚盛砂做支撑剂，使其成为注水井和采油井中间的一道透油阻水筛，使石油开采区被该透油阻水筛分隔成注水区和采油区。在注水压力作用下，油水混合物通过该透油阻水筛时，水被截留在注水区，原油则透过筛子聚积在筛子的采油区一侧。待注水区全部石油透过筛子进入采油区后，因没有原油通过筛子，注水区注水压力会陡然升高，使筛子成为透水筛，透过来的水继续推动采油区剩余油进入油井。利用该采油方法将油田大部分剩余油采出，使石油采收率接近100%。

Description

水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法 技术领域
本发明属于石油开采，特别涉及一种水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法。
背景技术
随着石油大量的消耗，石油作为一种重要的能源化工原料日益短缺，但由于油层产液含水量越来越高，大庆等主力油田综合含水接近94%，使现有技术条件下还有地质储量的50%以上的石油无法开采，开采成本逐年加高。压裂技术是提高油井产量的主要措施，但在高含水期，压裂易导致水淹， 为了控制油田产液含水的上升，通过砂覆膜技术，使普通砂具有增强水表面张力并破坏油表面张力的功能，从而使具有透油阻水功能的孚盛砂应运而生。但其透油阻水功能的选择性在不同驱替压力下表现出极大的差异，在驱替压力极低时，水完全不能透过孚盛砂，在高驱替压力时，仍用大量水可以通过，也就是说随着驱替压力的升高，其透油阻水功能变弱，这也可从其试验数据中得到验证，见表一：
驱替液 流速（ mL/min ） 驱替压力（ Mpa ） 备注
水 5 0.033 /
10 0.052 /
油水同驱 5 0.025 油水体积比 6 ： 4
10 0.048 油水体积比 5.8 ： 4.2
油 5 0.11 /
10 0.023 /
在油水同驱一栏中，当驱替压力从 0.025 MPa 增加到 0.048 MPa 后，流出液中油水体积比由 6 ： 4 变化为 5.8 ： 4.2 。这一变化说明，随着驱替压力的升高，孚盛砂的透油阻水功能在降低。按现有技术，为控制产液含水，孚盛砂被直接用作油井压裂缝的支撑剂，由于采油过程中油层和抽油泵固定凡尔下井筒内的巨大压力差，使大量的水透过孚盛砂被压入井筒，从而使其透油阻水功能大打折扣。
为避免孚盛砂在高驱替压力下阻水透油功能降低的问题，迫切需要建立一种新的孚盛砂应用方法，以充分发挥孚盛砂在低驱动压力下优异的阻水功能，使水完全不能透过孚盛砂。
 技术问题
本发明 旨在于克服现有技术的不足，而提供了一种 水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法 。
技术解决方案
本发明的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，是在注水井排和采油井排之间的逐个水平井垂向射孔并压裂，在压裂缝隙中填充具有透油阻水功能的孚盛砂做支撑剂，建立一道透油阻水筛来过滤油水混合物。
作为本发明的进一步改进，所述的水平井垂向射孔并压裂是在注水井排和采油井排之间的油层按垂直于的最小地应力方向钻水平井，对其垂向密集射孔后进行压裂。
作为本发明的进一步改进，所述的透油阻水筛是在逐个水平井垂向压裂缝中注入孚盛砂，该透油阻水筛将原石油开采区分隔成注水区和采油区，在注水压力驱动下，油水混合物在通过筛子时，原油透过筛子聚积在采油区一侧，水被截留在注水区；注水区全部石油透过筛子进入采油区后,因为没有原油通过筛子，使注水区注水压力陡然升高，使筛子被击穿成为透水筛，透过来的水继续推动采油区的剩余油驱向油井而被采出。
作为本发明的进一步改进，在采油区采出液含水上升到一定程度后，改变注采方向，再将原采油井改为注水井、注水井改为采油井，在注水压力作用下，原采油区大部分剩余油透过筛子聚积在另一侧，待无原油通过筛子，注水压力会陡然升高时，停掉注水井，将采油井改为注水井，水平井改为采油井，聚积在筛子侧面的剩余油在压力作用下透过压裂缝进入水平井，将油采出。
 有益效果
本发明 水平井压裂缝内填充孚盛砂建立透油阻水筛的采油方法设计合理，在采油工业中降低出水量，提高了采油量，投资少，效益高。
附图说明
图1为油层内建立透油阻水筛及第一阶段生产过程横断面图。
图2为油层内建立透油阻水筛及第二阶段生产过程横断面图。
图3为油层内建立透油阻水筛及第三阶段生产过程横断面图。
图4为透油阻水筛及第一阶段生产过程的平面示意图。
图5为垂直于水平最小地应力水平段垂向射孔建立竖向裂缝图。
图6五点法井网布设水平井东北～西南向布局。
图7五点法井网布设水平井西北～东南方向布局。
图8五点法井网布设水平井南北方向布局。
图9五点法井网布设水平井东西方向布局。
 本发明的最佳实施方式
本发明的所述的透油阻水筛是在逐个水平井的垂向压裂缝中注入孚盛砂，该透油阻水筛将原石油开采区分隔成注水区和采油区，在注水压力驱动下，油水混合物在通过筛子时，原油透过筛子聚积在采油区一侧，水被截留在注水区；注水区全部石油透过筛子进入采油区后,因为没有原油通过筛子，使注水区注水压力陡然升高，使筛子被击穿成为透水筛，透过来的水继续推动采油区的剩余油驱向油井而被采出，如图1所示。
采油区采出液含水上升到一定程度后，改变注采方向，再将原采油井改为注水井、注水井改为采油井，在注水压力作用下，原采油区大部分剩余油透过筛子聚积在另一侧，待无原油通过筛子，注水压力会陡然升高时，如图2所示，这时就要及时停掉注水井，将采油井改为注水井，水平井改为采油井，聚积在筛子侧面的剩余油在压力作用下透过压裂缝进入水平井，将油采出，如图3所示。
透油阻水筛在油层中的展布形状完全受水平井压裂缝的控制。为使筛子在油层中呈垂直于水流方向的铅垂面，水平井水平段必须只进行垂向上下密集射孔，而且水平段的走向要尽量与地层的水平最小地应力方向垂直，如图5所示。
只进行垂向射孔压裂时，重力对裂缝启裂方向影响小，可使裂缝向下、向下垂向延伸；密集射孔和水平段垂直于水平最小地应力可使裂缝面垂直于水流方向（也就是顺着水平段方向）。这样就能够得到我们所需要的裂缝形状，注入孚盛砂后就得到了想要的透油阻水筛。
大部分井网为五点法面积井网。为确保水平井水平段垂直于最小水平地应力方向，以大庆油田为例，其水平井段有四种布设走向可以选择，详见图6～图9，其中南北向和东西向布设时，需将五点法井网改为行列井网，而斜向布井则不需调整井网。四种布设中选用的原则是尽量确保水平段垂直于水平最小地应力，从而使压裂缝满足布设筛面的要求。
筛面的具体大小规模等应结合当地当时的地质条件确定，筛面的长度一般与水平段长度相同，国内目前水平段最大长度已达2800m；筛面的高度应与单一主力油层厚度一致，或与多油层砂岩总厚度一致。
另外，在垂直井可压成竖向裂缝的地区，利用垂直井竖排射孔并压裂，也可以压出垂直于水流方向的裂缝面，填充孚盛砂后也可成为具有过滤石油功能的筛子，技术人员可根据当地井网布局和地质条件灵活应用，但其核心技术都在本专利保护范围内。
 本发明的实施方式
本发明的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，其特征是在注水井排和采油井排之间的逐个水平井垂向射孔并压裂，在压裂缝隙中填充具有透油阻水功能的孚盛砂做支撑剂，建立一道透油阻水筛来过滤油水混合物。
本发明的所述的水平垂向压裂是在注水井排和采油井排之间的油层按垂直于的最小地应力方向钻水平井，对其垂向密集射孔后进行压裂。
本发明的所述的透油阻水筛是在逐个水平井的垂向压裂缝中注入孚盛砂，该透油阻水筛将原石油开采区分隔成注水区和采油区，在注水压力驱动下，油水混合物在通过筛子时，原油透过筛子聚积在采油区一侧，水被截留在注水区；注水区全部石油透过筛子进入采油区后,因为没有原油通过筛子，使注水区注水压力陡然升高，使筛子被击穿成为透水筛，透过来的水继续推动采油区的剩余油驱向油井而被采出，如图1所示。
采油区采出液含水上升到一定程度后，改变注采方向，再将原采油井改为注水井、注水井改为采油井，在注水压力作用下，原采油区大部分剩余油透过筛子聚积在另一侧，待无原油通过筛子，注水压力会陡然升高时，如图2所示，这时就要及时停掉注水井，将采油井改为注水井，水平井改为采油井，聚积在筛子侧面的剩余油在压力作用下透过压裂缝进入水平井，将油采出，如图3所示。
透油阻水筛在油层中的展布形状完全受水平井压裂缝的控制。为使筛子在油层中呈垂直于水流方向的铅垂面，水平井水平段必须只进行垂向上下密集射孔，而且水平段的走向要尽量与地层的水平最小地应力方向垂直，如图5所示。
只进行垂向射孔压裂时，重力对裂缝启裂方向影响小，可使裂缝向下、向下垂向延伸；密集射孔和水平段垂直于水平最小地应力可使裂缝面垂直于水流方向（也就是顺着水平段方向）。这样就能够得到我们所需要的裂缝形状，注入孚盛砂后就得到了想要的透油阻水筛。
大部分井网为五点法面积井网。为确保水平井水平段垂直于最小水平地应力方向，以大庆油田为例，其水平井段有四种布设走向可以选择，详见图6～图9，其中南北向和东西向布设时，需将五点法井网改为行列井网，而斜向布井则不需调整井网。四种布设中选用的原则是尽量确保水平段垂直于水平最小地应力，从而使压裂缝满足布设筛面的要求。
筛面的具体大小规模等应结合当地当时的地质条件确定，筛面的长度一般与水平段长度相同，国内目前水平段最大长度已达2800m；筛面的高度应与单一主力油层厚度一致，或与多油层砂岩总厚度一致。
另外，在垂直井可压成竖向裂缝的地区，利用垂直井竖排射孔并压裂，也可以压出垂直于水流方向的裂缝面，填充孚盛砂后也可成为具有过滤石油功能的筛子，技术人员可根据当地井网布局和地质条件灵活应用，但其核心技术都在本专利保护范围内。
 工业实用性
本发明的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，克服了现有在高驱动压力下应用孚盛砂的缺陷，充分发挥其低压驱动时超强的阻水功能。根据注水井注水驱油到采油井采出的生产过程，通过注水井排和采油井排之间水平井垂向压裂缝内填充具有透油阻水功能的孚盛砂，来建立一道能够对油水混合物进行过滤的筛子，过滤筛将生产区分隔为注水区和采油区。该筛子在生产过程中两侧压力差的估算值仅有0.0025MPa，能充分利用孚盛砂在低压驱动时所具有的严格的阻水功能，使油透过筛子聚积在筛子的采油区侧，而水被截留在注水区。待注水区全部剩余油进入采油区后，由于没有原油通过筛子，则注水区内压力会陡然升高，使筛子变成透水筛，透过筛子的水继续推动采油区内的石油进入采油井。待采油区采出液含水上升到一定高度后，应将原注水井改为采油井、原采油井改为注水井，也就是原采油区变为注水区、原注水区改为采油区，使原采油区剩余油反向透过筛子聚积在筛子的另一侧。然后再将注水井停掉、而油井改为注水井且水平井改为采油井，使聚积在筛面的油在注水压力作用下透过压裂缝进入水平井并被采出。这个注水区和采油区之间的转化，改变了液流通过筛子的方向，从而实现了筛子在油层中左右移动的效果，最终将其两侧剩余油过滤后采出，使采收率接近100%。
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Claims (4)

  1. 水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，其特征是在注水井排和采油井排之间的逐个水平井垂向压裂，在压裂缝隙中填充具有透油阻水功能的孚盛砂做支撑剂，建立一道透油阻水筛来过滤油水混合物。
  2. 如权利要求1所述的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，其特征是所述的水平垂向压裂是在注水井排和采油井排之间的油层按垂直于最小地应力方向钻水平井，对其垂向密集射孔后进行压裂。
  3. 如权利要求1或2所述的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，其特征是所述的透油阻水筛是在逐个水平井的垂向压裂缝中注入孚盛砂，该透油阻水筛将原石油开采区分隔成注水区和采油区，在注水压力驱动下，油水混合物在通过筛子时，原油透过筛子聚积在采油区一侧，水被截留在注水区；注水区全部石油透过筛子进入采油区后,因为没有原油通过筛子，使注水区注水压力陡然升高，使筛子被击穿成为透水筛，透过来的水继续推动采油区的剩余油驱向油井而被采出。
  4. 如权利要求3所述的水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法，其特征是在采油区采出液含水上升到一定程度后，改变注采方向，再将原采油井改为注水井、注水井改为采油井，在注水压力作用下，原采油区大部分剩余油透过筛子聚积在另一侧，待无原油通过筛子，注水压力会陡然升高时，停掉注水井，将采油井改为注水井，水平井改为采油井，聚积在筛子侧面的剩余油在压力作用下透过压裂缝进入水平井，将油采出。
PCT/CN2012/083425 2011-10-26 2012-10-24 水平井压裂缝填充孚盛砂建立透油阻水筛的采油方法 WO2013060270A1 (zh)

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