WO2020087332A1 - Elliptical wellbore design method adapted to deep ground stress - Google Patents
Elliptical wellbore design method adapted to deep ground stress Download PDFInfo
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- WO2020087332A1 WO2020087332A1 PCT/CN2018/112936 CN2018112936W WO2020087332A1 WO 2020087332 A1 WO2020087332 A1 WO 2020087332A1 CN 2018112936 W CN2018112936 W CN 2018112936W WO 2020087332 A1 WO2020087332 A1 WO 2020087332A1
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000013461 design Methods 0.000 title claims abstract description 8
- 238000011065 in-situ storage Methods 0.000 claims description 78
- 239000011435 rock Substances 0.000 claims description 20
- 238000004088 simulation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
Definitions
- step b including the following steps, the maximum in-situ stress ⁇ 1 and the minimum in-situ stress ⁇ 2 are determined according to all in-situ stresses at a depth of 1 / 2h to h.
- Calculating and determining the parameters of the elliptical wellbore based on the maximum in-situ stress ⁇ 1 and the minimum in-situ stress ⁇ 2 it also includes: determining the position of the lifting device in the elliptical wellbore so that the lifting direction of the lifting device passes the focal point of the elliptical wellbore.
- the stability parameter of a certain rock layer is outside the predetermined range, the maximum in-situ stress ⁇ 1 and the minimum in-situ stress ⁇ 2 are determined in the corresponding rock layer;
- the elliptical wellbore is a vertical well.
- step d According to the measured in-situ stress, the elliptical wellbore simulation experiment with different long and short axes is carried out using materials similar to the elliptical wellbore and the parameters of the elliptical wellbore are determined. And other parameters such as the wall thickness of the elliptical wellbore.
- the ground from the position of the elliptical wellbore to the depth of h is divided into at least two rock layers, and the stability parameters of each of the rock layers are detected;
- the elliptical wellbore is a vertical well.
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Disclosed is an elliptical wellbore design method adapted to deep ground stress. The method comprises: determining an opening position of an elliptical wellbore and the depth h of the elliptical wellbore; detecting all ground stresses from the ground to the depth h at the position where the elliptical wellbore is located, and determining the maximum ground stress σ1 and the minimum ground stress σ2; determining the major-axis direction of the elliptical wellbore according to the direction of the maximum ground stress σ1; and calculating and determining parameters of the elliptical wellbore according to the maximum ground stress σ1 and the minimum ground stress σ2. By means of the method, it can be ensured that a coupling relationship is created between the ground stresses and the elliptical wellbore, thereby ensuring that the elliptical wellbore can effectively overcome the ground stresses during use.
Description
本发明涉及煤矿配套设施技术领域，特别是一种适应深部地应力的椭圆井筒设计方法。The invention relates to the technical field of coal mine supporting facilities, in particular to an elliptical wellbore design method adapted to deep ground stress.
随着资源开采向深部开发，由于立井开拓方式对开采深度、煤层条件、水文地质条件要求不高，采用立井开拓是较为妥当的方式。立井分为主、副井，分别控制煤炭运输、人员及材料运输，是矿井的咽喉，但是地应力的方向与大小对井筒稳定性有着至关重要的作用，特别是水平应力的大小与方向，现有的井筒开拓形状主要以圆形为主，在建设过程中基本没有考虑地应力与井筒形状的耦合作用关系，会造成在应用过程中井筒受地应力破坏而造成损失。As resource mining develops deeper, because the shaft development method does not have high requirements on the mining depth, coal seam conditions, and hydrogeological conditions, the use of shaft development is a more appropriate method. The vertical shaft is divided into main and auxiliary shafts, which control coal transportation, personnel and material transportation, and are the throat of the mine. However, the direction and magnitude of in-situ stress play a vital role in the stability of the wellbore, especially the size and direction of horizontal stress. The existing wellbore development shape is mainly circular, and the coupling relationship between the in-situ stress and the shape of the wellbore is basically not considered during the construction process, which will cause the wellbore to be damaged by the ground stress and cause losses during the application process.
发明内容Summary of the invention
为了解决上述技术问题，而提供一种根据地应力设计椭圆井筒的适应深部地应力的椭圆井筒设计方法。In order to solve the above technical problems, an elliptical wellbore design method adapted to the deep in-situ stress is designed according to the in-situ stress.
一种适应深部地应力的椭圆井筒设计方法，包括：An elliptical wellbore design method adapted to deep in-situ stress includes:
a、确定椭圆井筒的开设位置和椭圆井筒深度h；a. Determine the opening position of the elliptical wellbore and the depth of the elliptical wellbore h;
b、检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б
1和最小地应力б
2；
b. Detect all in-situ stresses from the surface of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 ;
c、根据最大地应力б
1的方向确定椭圆井筒的长轴方向；
c. Determine the long axis direction of the elliptical wellbore according to the direction of the maximum geostress б 1 ;
d、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井筒参数。
d. According to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , calculate and determine the parameters of the elliptical wellbore.
在c中，椭圆井筒的长轴方向与最大地应力б
1的方向平行，且使椭圆井筒的短轴方向与所述椭圆井筒的长轴方向垂直。
In c, the long axis direction of the elliptical wellbore is parallel to the direction of the maximum geostress б 1 , and the short axis direction of the elliptical wellbore is perpendicular to the long axis direction of the elliptical wellbore.
在d中：根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数。In d: According to the measured in-situ stress, the elliptical wellbore simulation experiment with different long and short axes is carried out by using materials similar to the elliptical wellbore and the parameters of the elliptical wellbore are determined.
在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数中，还包括根据岩石力学参 数进行不同长、短轴的椭圆井筒的相似材料模拟。In the elliptical wellbore simulation experiment with different long and short axes and the determination of the parameters of the elliptical wellbore using materials similar to the elliptical wellbore according to the measured in-situ stress, the similar material simulation of the elliptical wellbore with different long and short axes according to the rock mechanics parameters is also included .
在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数的步骤中，包括：The steps of using elliptical wellbore simulation experiments with different long and short axes based on the measured in-situ stress and determining the parameters of the elliptical wellbore include:
在模拟椭圆井筒的周围设置应力传感器；Set stress sensors around the simulated elliptical wellbore;
通过所述应力传感器检测预定位置的应力。The stress at a predetermined position is detected by the stress sensor.
所述椭圆井筒深度h的范围为不小于2000m。The range of the depth h of the elliptical wellbore is not less than 2000m.
在b步骤中，包括以下步骤，根据深度为1/2h到h处的所有地应力确定最大地应力б
1和最小地应力б
2。
In step b, including the following steps, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined according to all in-situ stresses at a depth of 1 / 2h to h.
在d、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井筒参数中，还包括：在椭圆井筒中设置将椭圆井筒分为两个提升通道的隔板，所述隔板的设置方向与最小地应力б
2的方向平行。
In d. Calculating and determining the parameters of the elliptical wellbore according to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , the method further includes: setting a partition plate that divides the elliptical wellbore into two lifting channels in the elliptical wellbore. The setting direction is parallel to the direction of the minimum ground stress б 2 .
所述隔板的中心线经过长轴与短轴的交点。The centerline of the separator passes through the intersection of the long axis and the short axis.
在d、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井筒参数中，还包括：确定椭圆井筒内提升装置的位置，使提升装置的提升方向经过椭圆井筒的焦点。
In d. Calculating and determining the parameters of the elliptical wellbore based on the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , it also includes: determining the position of the lifting device in the elliptical wellbore so that the lifting direction of the lifting device passes the focal point of the elliptical wellbore.
在检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б
1和最小地应力б
2中，包括根据设定条件将椭圆井筒位置处的地面到深度为h处范围的地层分为至少两层岩层，并检测每一所述岩层的稳定性参数；
Detect all in-situ stresses from the surface at the position of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , including the range from the surface of the elliptical wellbore to the depth h according to the set conditions The stratum is divided into at least two layers, and the stability parameters of each layer are tested;
若某一所述岩层的稳定性参数在预定范围外，则在对应的岩层内确定最大地应力б
1和最小地应力б
2；
If the stability parameter of a certain rock layer is outside the predetermined range, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in the corresponding rock layer;
若所有所述岩层的稳定性参数均在预定范围内，则在所有所述岩层内确定最大地应力б
1和最小地应力б
2。
If the stability parameters of all the rock layers are within a predetermined range, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in all the rock layers.
所述椭圆井筒为立井。The elliptical wellbore is a vertical well.
本发明提供的适应深部地应力的椭圆井筒设计方法，通过对椭圆井筒位置的地应力进行检测，并选择最大地应力和最小地应力对椭圆井筒参数进行确定，能够保证地应力与椭圆井筒产生耦合关系，保证椭圆井筒在使用过程中能够有效克服地应力对椭圆井筒造成的破坏。The design method of the elliptical wellbore adapted to the deep geostress provided by the present invention can detect the geostress at the position of the elliptical wellbore and select the maximum and minimum geostress to determine the parameters of the elliptical wellbore, which can ensure the coupling of the geostress and the elliptical wellbore Relationship to ensure that the elliptical wellbore can effectively overcome the damage caused by the ground stress to the elliptical wellbore during use.
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合 附图及实施例对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用于解释本发明，并不用于限定本发明。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
一种适应深部地应力的椭圆井筒设计方法，包括：An elliptical wellbore design method adapted to deep in-situ stress includes:
a、确定椭圆井筒的开设位置和椭圆井筒深度h；a. Determine the opening position of the elliptical wellbore and the depth of the elliptical wellbore h;
b、检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б
1和最小地应力б
2；
b. Detect all in-situ stresses from the surface of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 ;
c、根据最大地应力б
1的方向确定椭圆井筒的长轴方向；
c. Determine the long axis direction of the elliptical wellbore according to the direction of the maximum geostress б 1 ;
d、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井筒参数，使得椭圆井筒能够与地应力耦合，保证椭圆井筒在使用过程中的稳定性。
d. According to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , calculate and determine the parameters of the elliptical wellbore so that the elliptical wellbore can be coupled with the in-situ stress and ensure the stability of the elliptical wellbore during use.
在c步骤中，椭圆井筒的长轴方向与最大地应力б
1的方向平行，且使椭圆井筒的短轴方向与所述椭圆井筒的长轴方向垂直，因椭圆的形状结构限制，使长轴方向与最大地应力б
1平行时，能够保证椭圆进行最小形变，进而保证椭圆井筒的整体结构。
In step c, the long axis direction of the elliptical wellbore is parallel to the direction of the maximum geostress б 1 , and the short axis direction of the elliptical wellbore is perpendicular to the long axis direction of the elliptical wellbore. when the direction parallel to maximally stress б 1, to ensure minimal deformation ellipse, thereby ensuring an overall configuration of an elliptical borehole.
在d步骤中：根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数，根据实验结果计算得出椭圆井筒的长轴长度、短轴长度及椭圆井筒壁厚等参数。In step d: According to the measured in-situ stress, the elliptical wellbore simulation experiment with different long and short axes is carried out using materials similar to the elliptical wellbore and the parameters of the elliptical wellbore are determined. And other parameters such as the wall thickness of the elliptical wellbore.
在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数中，还包括根据岩石力学参数进行不同长、短轴的椭圆井筒模拟，综合考虑岩石力学参数和地应力，对椭圆井筒进行模拟实验，保证实验参数与椭圆井筒位置的真正参数尽可能接近，进而保证真正椭圆井筒的参数的可靠性。In the elliptical wellbore simulation experiment with different long and short axes and the determination of the parameters of the elliptical wellbore using materials similar to the elliptical wellbore according to the measured in-situ stress, the elliptical wellbore simulation of different long and short axes according to the rock mechanics parameters is also included. Rock mechanical parameters and in-situ stress are used to simulate the elliptical wellbore to ensure that the experimental parameters are as close as possible to the true parameters of the elliptical wellbore position, thereby ensuring the reliability of the parameters of the true elliptical wellbore.
在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数中，包括在模拟椭圆井筒的周围设置应力传感器；通过所述应力传感器检测预定位置的应力。In the elliptical wellbore simulation experiment with different lengths and short axes according to the measured in-situ stress and the determination of the parameters of the elliptical wellbore with different long and short axes, including setting a stress sensor around the simulated elliptical wellbore; detecting the predetermined position by the stress sensor Of stress.
所述椭圆井筒深度h的范围为不小于2000m。The range of the depth h of the elliptical wellbore is not less than 2000m.
在b步骤、检测椭圆井筒位置处底面到深度为h处的所有地应力，并确定最大地应力б
1和最小地应力б
2中，根据深度为1/2h到h处的所有地应力确定最大地应力б
1和最小地应力б
2，也即优选根据一定深度的地应力进行确定，以满足椭圆井筒能够适应整个深度的地应力要求。
In step b, detect all in-situ stresses from the bottom surface of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , and determine the maximum according to all in-situ stresses from depth 1 / 2h to h In-situ stress б 1 and minimum in-situ stress б 2 , that is, it is preferably determined according to the in-situ stress at a certain depth, so as to meet the in-situ stress requirement that the elliptical wellbore can adapt to the entire depth.
在d步骤、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井 筒参数中，还包括：在椭圆井筒中设置将椭圆井筒分为两个提升通道的隔板，所述隔板与最小地应力б
2的方向平行，隔板即起到隔离通道的目的，也能够对椭圆的最小地应力方向进行一定支撑，增加椭圆井筒的应力承受能力。
In step d, calculating and determining the parameters of the elliptical wellbore according to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , further comprising: setting a partition plate in the elliptical wellbore that divides the elliptical wellbore into two lifting channels, the partition plate Parallel to the direction of the minimum in-situ stress б 2 , the separator serves the purpose of isolating the channel, and can also support the direction of the minimum in-situ stress of the ellipse, increasing the stress bearing capacity of the elliptical wellbore.
所述隔板的中心线经过长轴与短轴的交点，优选的，所述隔板的横截面的中心处于椭圆井筒的中心处。The center line of the separator passes through the intersection of the long axis and the short axis. Preferably, the center of the cross section of the separator is at the center of the elliptical wellbore.
在d步骤、根据最大地应力б
1和最小地应力б
2，计算并确定椭圆井筒参数中，还包括：确定椭圆井筒内提升装置的位置，使提升装置的提升方向经过椭圆井筒的焦点，当提升装置的数量为两个时，能够在椭圆井筒的两个焦点处进行提升，两个提升装置能够联动，也能够单独进行提升。
In step d, according to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , the calculation and determination of the parameters of the elliptical wellbore also include: determining the position of the lifting device in the elliptical wellbore so that the lifting direction of the lifting device passes the focal point of the elliptical wellbore, when When the number of lifting devices is two, they can be lifted at the two focal points of the elliptical wellbore. The two lifting devices can be linked together and can be lifted separately.
在检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б
1和最小地应力б
2中，包括
Detect all in-situ stresses from the surface of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , including
根据设定条件将椭圆井筒位置处的地面到深度为h处范围的地层分为至少两层岩层，并检测每一所述岩层的稳定性参数；According to the set conditions, the ground from the position of the elliptical wellbore to the depth of h is divided into at least two rock layers, and the stability parameters of each of the rock layers are detected;
若某一所述岩层的稳定性参数在预定范围外，则在对应的岩层内确定最大地应力б
1和最小地应力б
2；
If the stability parameter of a certain rock layer is outside the predetermined range, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in the corresponding rock layer;
若所有所述岩层的稳定性参数均在预定范围内，则在所有所述岩层内确定最大地应力б
1和最小地应力б
2
If the stability parameters of all the rock formations are within a predetermined range, then the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in all the rock formations
所述椭圆井筒为立井。The elliptical wellbore is a vertical well.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned examples only express several embodiments of the present invention, and their descriptions are more specific and detailed, but they should not be construed as limiting the patent scope of the present invention. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all fall within the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.
Claims (12)
- 一种适应深部地应力的椭圆井筒设计方法，其特征在于：包括：An elliptical wellbore design method adapted to deep in-situ stress is characterized by:a、确定椭圆井筒的地面开设位置和椭圆井筒深度h；a. Determine the surface opening position of the elliptical wellbore and the depth of the elliptical wellbore h;b、检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б 1和最小地应力б 2； b. Detect all in-situ stresses from the surface of the elliptical wellbore to the depth h, and determine the maximum in-situ stress б 1 and the minimum in-situ stress б 2 ;c、根据最大地应力б 1的方向确定椭圆井筒的长轴方向； c. Determine the long axis direction of the elliptical wellbore according to the direction of the maximum geostress б 1 ;d、根据最大地应力б 1和最小地应力б 2，计算并确定椭圆井筒参数。 d. According to the maximum in-situ stress б 1 and the minimum in-situ stress б 2 , calculate and determine the parameters of the elliptical wellbore.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：在c步骤中，椭圆井筒的长轴方向与最大地应力б 1的方向平行，且使椭圆井筒的短轴方向与所述椭圆井筒的长轴方向垂直。 The method for designing an elliptical wellbore according to claim 1, wherein in step c, the long axis direction of the elliptical wellbore is parallel to the direction of the maximum geostress б 1 , and the short axis direction of the elliptical wellbore is parallel to the elliptical wellbore The long axis direction is vertical.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：在d步骤中：根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数。The method for designing an elliptical wellbore according to claim 1, characterized in that in step d: using similar materials to the elliptical wellbore according to the measured in-situ stress, an elliptical wellbore simulation experiment with different lengths and short axes is performed and parameters of the elliptical wellbore are determined.
- 根据权利要求3所述的椭圆井筒设计方法，其特征在于：在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数的步骤中，包括：根据岩石力学参数进行不同长、短轴的椭圆井筒的相似材料模拟。The method for designing an elliptical wellbore according to claim 3, characterized in that the steps of performing elliptical wellbore simulation experiments with different lengths and short axes using similar materials to the elliptical wellbore according to the measured in-situ stress and determining the parameters of the elliptical wellbore include : Carry out similar material simulation of elliptical wellbore with different long and short axes according to rock mechanical parameters.
- 根据权利要求3或4所述的椭圆井筒设计方法，其特征在于：在根据所测地应力采用与椭圆井筒相似的材料进行不同长、短轴的椭圆井筒模拟实验并确定椭圆井筒参数的步骤中，包括：The method for designing an elliptical wellbore according to claim 3 or 4, characterized in that in the step of performing elliptical wellbore simulation experiments of different lengths and short axes using materials similar to the elliptical wellbore according to the measured in-situ stress and determining the parameters of the elliptical wellbore ,include:在模拟椭圆井筒的周围设置应力传感器；Set stress sensors around the simulated elliptical wellbore;通过所述应力传感器检测预定位置的应力。The stress at a predetermined position is detected by the stress sensor.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：所述椭圆井筒深度h的范围为不小于2000m。The method for designing an elliptical wellbore according to claim 1, wherein the range of the depth h of the elliptical wellbore is not less than 2000m.
- 根据权利要求1或6所述的椭圆井筒设计方法，其特征在于：在b步骤中，包括以下步骤：The method for designing an elliptical wellbore according to claim 1 or 6, wherein step b includes the following steps:根据距离地面深度为1/2h到h处的所有地应力确定最大地应力б 1和最小地应力б 2。 The maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined according to all in-situ stresses from the ground depth of 1 / 2h to h.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：在d、根据最大地应力б 1和最小地应力б 2，计算并确定椭圆井筒参数中，包括：在椭圆井筒中设置将椭圆井筒分为两个提升通道的隔板，所述隔 板的设置方向与最小地应力б 2的方向平行。 The method for designing an elliptical wellbore according to claim 1, characterized in that, in d, calculating and determining the parameters of the elliptical wellbore according to the maximum geostress б 1 and the minimum geostress б 2 , the method includes: setting an elliptical wellbore in the elliptical wellbore A baffle divided into two lifting channels, the installation direction of the baffle is parallel to the direction of the minimum ground stress б 2 .
- 根据权利要求8所述的椭圆井筒设计方法，其特征在于：所述隔板的中心线经过长轴与短轴的交点。The method for designing an elliptical wellbore according to claim 8, wherein the centerline of the separator passes through the intersection of the long axis and the short axis.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：在d、根据最大地应力б 1和最小地应力б 2，计算并确定椭圆井筒参数中，还包括：确定椭圆井筒内提升装置的位置，使提升装置的提升方向经过椭圆井筒的焦点。 The method for designing an elliptical wellbore according to claim 1, characterized in that, in d, calculating and determining the parameters of the elliptical wellbore according to the maximum geostress б 1 and the minimum geostress б 2 , further comprising: determining the Position, so that the lifting direction of the lifting device passes the focus of the elliptical wellbore.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：在检测椭圆井筒位置处地面到深度为h处的所有地应力，并确定最大地应力б 1和最小地应力б 2中，包括： The method for designing an elliptical wellbore according to claim 1, characterized in that: detecting all in-situ stresses from the ground surface to the depth h at the position of the elliptical wellbore, and determining the maximum in-situ stress б 1 and the minimum in-situ stress б 2 include:根据设定条件将椭圆井筒位置处的地面到深度为h处范围的地层分为至少两层岩层，并检测每一所述岩层的稳定性参数；According to the set conditions, the ground from the position of the elliptical wellbore to the depth of h is divided into at least two rock layers, and the stability parameters of each of the rock layers are detected;若某一所述岩层的稳定性参数在预定范围外，则在对应的岩层内确定最大地应力б 1和最小地应力б 2； If the stability parameter of a certain rock layer is outside the predetermined range, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in the corresponding rock layer;若所有所述岩层的稳定性参数均在预定范围内，则在所有所述岩层内确定最大地应力б 1和最小地应力б 2。 If the stability parameters of all the rock layers are within a predetermined range, the maximum in-situ stress б 1 and the minimum in-situ stress б 2 are determined in all the rock layers.
- 根据权利要求1所述的椭圆井筒设计方法，其特征在于：所述椭圆井筒为立井。The method for designing an elliptical wellbore according to claim 1, wherein the elliptical wellbore is a vertical shaft.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080093125A1 (en) * | 2006-03-27 | 2008-04-24 | Potter Drilling, Llc | Method and System for Forming a Non-Circular Borehole |
| CN103195374A (en) * | 2013-03-27 | 2013-07-10 | 西南石油大学 | Method for designing salt rock stratum irregular-shaped sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080093125A1 (en) * | 2006-03-27 | 2008-04-24 | Potter Drilling, Llc | Method and System for Forming a Non-Circular Borehole |
| CN103195374A (en) * | 2013-03-27 | 2013-07-10 | 西南石油大学 | Method for designing salt rock stratum irregular-shaped sleeve |
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