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A salt-gypsum layer and casing technology, applied in casing, drill pipe, drilling equipment, etc., can solve the problems of unscientific, high alloy cost and raw material cost, high difficulty in smelting and rolling process, and achieve high yield strength. Effect
Inactive Publication Date: 2012-03-21
TIANJIN PIPE (GROUP) CORP
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However, the alloy cost and raw material cost of the steel pipe are relatively high. This method is not scientific, and the smelting and rolling process is more difficult when the alloy content is high.
Method used
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Embodiment 1
[0060] Embodiment 1: A kind of this product produced according to above-mentioned design and process requirement is: steel grade 130ksi, specification is Φ152.4 * 16.90mm, take measures as follows during smelting and casting:
[0061] The ingredients adopt the scheme of high-quality scrap steel plus HBI to ensure the low content of copper and "five harmful" elements in the steel;
[0062] EAF strengthens dephosphorization, LF strictly controls the composition according to the target value, and strictly controls the temperature according to the requirements;
[0063] VD ensures sufficient vacuum degree and vacuum treatment time to ensure degassing effect;
[0065] The key to rolling tube technology is to obtain good surface quality and strict dimensional tolerances required for high-collapse casing. Therefore, the following measures are taken during the rolling process:
[0066] 210mm specification tube blank is us...
Embodiment 2
[0089] Taking steel grade 120ksi and specification Φ193.7×17.14mm as an example, the techniques adopted in the production process are as follows:
[0090] 1) Pure steel production technology
[0091] Using CaO-Al 2 o 3 High alkalinity slag; add CaC 2 The reduction atmosphere is strengthened by particles, and the effect of deoxidation and desulfurization is enhanced; Ar gas is blown at the bottom and stirred to make the steel composition uniform; steel is tapped from the eccentric furnace bottom to reduce inclusions; The slag is difficult to flow into the ladle.
[0092] The molten steel adopts vacuum treatment (VD), and blows argon at the bottom for more than 10 minutes, so that the content of hydrogen, oxygen and nitrogen in the steel is low, the content of sulfur is low, the inclusions are few, and the cleanliness of the molten steel is high, so as to ensure uniform steel material and high toughness .
[0093] The wire feeding treatment (FW) of the cored wire changes th...
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Abstract
The present invention provides a sleeve which is suitable for an evaporate bed of an oil well, which is composed of the following components by weight: 0.26%-0.31% of C; 0.25-0.35% of Si; 0.80-1.00% of Mn; less than or equal with 0.015% of P; less than or equal with 0.010% of S; 0.90-1.00% of Cr; 0.40-0.50% of Mo; 0.07-0.10% of V; and the balance of Fe and inevitable trace elements. The mechanical property is characterized in that: the yield strength is between 896MPa and 1034MPa; the tensile strength is larger than or equal with 1000MPa; an impact toughness index is characterized in that a Charpy impact energy is larger than or equal with 42J (0 DEG C+ / -3, 10*10*55mm, transverse sample); the elongation percentage is larger than or equal with 16%; the wall thickness precision reaches + / -10%; a ratio between an external diameter and the wall thickness reaches 9-14; the collapse resistance strength index exceeds an API 5C3 theoretical value for more than 40%; and the steel pipe is a seamless polished pipe structurally. The sleeve which is suitable for the evaporate bed of the oil well is advantageous in that: the ratio between the external diameter and the wall thickness is 9-14 under a non-uniform load environment when the non-uniform load Pu is larger than PO, an obvious advantage is obtained; and the sleeve can bear larger non-uniform load.
Description
technical field [0001] The invention relates to the production of a casing, in particular to a casing suitable for oil well salt-gypsum layers. Background technique [0002] At present, in the oil drilling industry, salt-gypsum formations and rock-salt formations are often encountered. After ordinary casings are run in, due to their thin wall thickness, the ratio of outer diameter / wall thickness is very large, and the general ratio may exceed 16, or the application In the perforated section of ordinary casing, the anti-collapse ability of the original casing decreases due to perforation. Although the anti-collapse strength index of the casing often meets the requirements of the industry standard (API theoretical value), the actual resistance If the formation pressure is not enough, the running casing body will be collapsed, or the service life will not be long after running, resulting in the scrapping of the whole well or failing to meet investment expectations, resulting in...
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Application Information
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