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A method for selecting casing materials for thermal recovery wells
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A thermal recovery well and casing technology, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problem that the casing does not meet the needs of thermal recovery wells, and achieve the effect of ensuring safe use and avoiding failure
Active Publication Date: 2016-10-26
BC P INC CHINA NAT PETROLEUM CORP +2
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[0006] In order to solve the problem that the selection method of the casing in the prior art does not meet the needs of the actual thermal recovery well, the embodiment of the present invention provides a method for selecting the casing material of the thermal recovery well
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Embodiment 1
[0033] Such as figure 1 As shown, the embodiment of the present invention provides a method for selecting a casing material for a thermal recovery well, and the method for selecting a casing material includes:
[0034] Step 1: Determine the material strength performance index and uniform elongation performance index of the casing material according to the depth of the thermal recovery well;
[0035] Step 2: Determine the creep rate performance index of the casing material according to the steam injection temperature at the wellhead of the thermal recovery well;
[0036] Step 3: Determine the Bauschinger effect performance index of the casing material according to the design life of the thermal recovery well;
[0037] Step 4: Determine the minimum low-cycle fatigue strain of the casing material according to the design life of the thermal recovery well and the steam injection temperature at the wellhead of the thermal recovery well;
[0038] Step 5: Select the geometric dimens...
Embodiment 2
[0058] Selection of Casings for Thermal Recovery Wells in Fengcheng District of Xinjiang Oilfield
[0059] Working condition:
[0060] 1) The well depth is 260 meters;
[0061] 2) The steam injection temperature at the wellhead is 260-300°C;
[0062] 3) The design life is 6 years;
[0063] 4) 3-4 rounds of steam injection per year.
[0064] Corresponding casing material performance index selection:
[0065] 1) The elastic limit is 450MPa, the tensile limit is 560MPa, and the uniform elongation is 4.5%;
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Abstract
The invention discloses a thermal recovery well casing material selection method. The casing material selection method comprises the steps of determining the material strength properties and the uniform elongation of a casing material according to the depth of a thermal recovery well; determining the creep rate performance of the casing material according to the steam injection temperature of a wellhead; determining the Bauschinger effect performance of the casing material according to the design life of the thermal recovery well; determining the least low-cycle fatigue strain value of a casing according to the design life of the thermal recovery well and the steam injection temperature of the wellhead; selecting the geometry size and structure characteristics of the casing according to the existing oil industry standards; and selecting the corresponding casing according to the performance indexes, geometry size and structure characteristics of the casing. Multiple performance indexes of the casing material are determined through the well depth, the steam injection temperature of the wellhead, and the design life of the thermal recovery well, and therefore the performance of the casing can be more comprehensively assessed; the casing can meet the production safety requirement on the steam huff and puff working condition; failure caused by plastic deformation of the casing can be effectively avoided; and the normal production of the thermal recovery well is guaranteed.
Description
technical field [0001] The invention relates to the field of petroleum and natural gas heavy oil exploitation, in particular to a method for selecting casing materials of thermal recovery wells. Background technique [0002] Heavy oil is one of the main types of oil and gas resources at home and abroad. Domestically, heavy oil is mainly exploited in Xinjiang, Liaohe, and Shengli Oilfields. The most important technology for heavy oil recovery is steam stimulation operation, and to realize steam stimulation operation, casing is needed to keep the wellbore safe. The casing is the channel connecting the oil layer and the ground, and the thermal recovery well maintains the stability of the wellbore through the casing, so the performance of the casing material is of great significance to the normal production of the oil well. [0003] In the prior art, the method for selecting casing materials for thermal recovery wells takes the yield strength as the main index, including room t...
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