Anti-icing conductor tube composite structure
Technical Field The invention relates to a marine petroleum engineering equipment, in particular for offshore well drilling riser sleeve anti-ice the anti-ice water sleeve combined structure. Background Art For offshore drilling purposes, water-proof sleeve pipes of the important drilling equipment is essential. Winter because of the sea ice covered, large SPAN ice, ice herculean, the large side force the water sleeve, therefore the surface layer of the anti-ice capacity water offshore drilling in winter play an important influence on the safe operation. At present, to improve surface water conduit anti-ice capacity of the conventional method is: One, adopts a double-layer water-proof conduit sleeve structure, as shown in Figure 1, that is, the diameter of the outer layer of 76.2 cm of outer water-proof casing 1 the [...] , diameter is used as the inner layer of 60.96 cm water of the inner layer of the sleeve 2 the [...] , the water in the casing 2 the internal [...] and sleeved with a surface casing 3 the [...] , two layers of water are the length of the quill from wellhead on water to the mud-line the following 50 meters. This kind of structure type in the inner water-proof casing tube 2 the construction under [...] , an inner water-proof casing tube 2 the depth the hammer enters[...] is very difficult to control, and would waste a large amount of water of the inner layer of the sleeve 2 the [...] , the construction time and costs will increase greatly. Second, the single-layer water-proof casing structure, , an additional conduit support horizontal level , use the conduit frame horizontal layer of water-resistant sleeve to centralize the single-layer, anti-ice of the sleeve to improve the ability of the water. This kind of structure type of the conduit to increase the workload of the frame construction and construction, great increase in the cost of construction and operation. Three, the large-size water casing structure, to improve the anti-ice capacity of the water casing, this kind of structure type will increase the water consumption volume of the steel material of the sleeve, the water-proof sleeve pipes is greatly increased cost of operation. Content of the invention Against the above-mentioned problem, the purpose of this invention is to offer a kind of anti-ice water sleeve combined structure, which can in the ice surface layer part to increase the range of the thickness of the water casing, enhancing surface layer water sleeve side stress resisting rigidity and resistance to bending, effectively improve the ability of anti-ice water-proof sleeve pipes. To achieve the above object, this invention adopts the following technical proposal: an anti-ice-water casing combined structure, includes a surface casing, a sleeve is disposed on the surface layer of the outer layer of the sleeve outside of the water casing, characterized in that a thickness in the range corresponding to the ice, the water in the outer layer of the sleeve and the surface casing is clamped between an inner layer of water-proof casing tube; the inner layer water is less than the length of the length of the outer water-proof sleeve pipes states the ice area and larger than the thickness of the; the outer water-proof casing and a lining insulation part of the annular space between the water casing, the inner layer and the surface layer of water between the sleeve and the annular portion of the sleeve in order to cement pouring consolidation. The inner layer water pipe respectively connected with the upper part and the lower part of the sleeve is fixedly connected with the surface layer, the surface layer and into the sleeve at the same time. The inner layer water the two ends of the sleeve respectively and the surface casing through connection joint threaded connection. Said connection joint comprises an inner fixed tube and an outer fixed tube, the inner fixed tube and the outer fixed tube is provided with a plurality of interval between the connecting plate, the connecting plate of the adjacent hole is formed between, the inner fixed tube through the screw thread on the upper end of the casing with the surface layer, the outer header through the screw thread at the lower end of the water casing and is connected with said inner layer. Said connection joint the inner fixed tube and the outer fixed tube is also arranged between the two or more reinforcing ribs. The inner layer insulation above sea level the top of the water casing 3-8 m, the inner layer and the length of pipe underwater water jacket 4-8 meters, the best for the inner layer water the drive pipe is long 10 meters, and the water, underwater length equal to 5 meters. The inner layer-thickness in the range of of the water casing 20-51mm, the best is 25 mm. The inner diameter of the outer water-proof sleeve pipes can be selected of 36 inches or 30 inch, the inner water-proof casing tube 2 can be selected the inner diameter of 24 inches or 20 inches, the surface casing 3 can be selected the inner diameter of the Inches or Inch, according to the need for properly combined. Because this invention adopting the above-mentioned technical scheme, it has the following advantages: 1, the water of the inner layer of the sleeve simplifies the length of the range of control in the ice, the ice region, it is equivalent to increasing the local range of the thickness of the outer water-proof sleeve pipes, so as to effectively improve the bushing in the ice water within the range of rigidity of the side stress resisting part of the, with the ice and increase the local range to correspond to the surface layer of the rigidity of the side stress resisting of the sleeve, thereby improving the overall anti-ice capacity of the water casing. 2, simplified water of the inner layer of the upper part and the lower part of the sleeve with the surface casing is connected through connection joint, the inner layer water through the upper part of the sleeve is connected with the upper joint and the surface casing, the lower part of the sleeve is the inner water through the lower joint and the surface casing is connected. The inner layer of the surface layer of water into the sleeve with the sleeve at the same time, the inner layer of the surface layer of water between the sleeve and the sleeve is fixed to the annulus in order to cement consolidation, in the prior art so as to avoid the inner layer of the water casing of the drilling depth of the defects is not easy to control, not only convenient for the construction, and reduce the material consumption of the sleeve. 3, in winter the water surface to the sea ice acting force of the sleeve, the water casing is combined structure is simplified, in order to resist function of marine ice in winter, the drilling operation in winter the safety can be ensured. 4, the drilling and completion period is not affected, and saves a great deal of cost. Description of drawings Figure 1 is a structure diagram of the double-layer water-proof sleeve pipes commonly used; Figure 2 is a schematic diagram of applications of this invention the water casing is combined structure of anti-ice of the specific embodiment; Figure 3 is-a schematic diagram of Figure 2; Figure 4 is a side view a schematic diagram of the anti-icing of the present invention the combined water casing is connected with the structure; Figure 5 is a three-dimensional a structure diagram of the invention the anti-ice water pipe connection used by the combined structure of the joint. Mode of execution In order to this invention the problem to be solved, by solving the problem by the technical scheme of the programme and beneficial effect of a more clear understanding, by contrast with the embodiment of the present invention. As shown in Figure 1, the invention relates to an anti-ice water sleeve combined structure, substantially a local thickening of the sleeve structure, is a simplified double-layer water-proof casing structure. It comprises: an outer water-proof casing 1, an inner layer of water-proof casing tube 2, a surface casing 3. Outer water-proof casing 1 is sleeved on the surface casing 3 outside; the inner layer water-proof casing tube 2 corresponding to the thickness of ice 4, is arranged in the outer water-proof casing 1 and the surface casing 3 between. The inner water-proof casing tube 2 is smaller than the length of the outer water-proof casing 1 and larger than the thickness of the length of the ice, in order to within the ice region, local an outer water-proof casing 1 of the thickness. Outer water-proof casing 1 and the inner-layer water-proof casing tube 2 part of the annular space between, the inner layer and the water casing 2 and the surface casing 3 in the annular space between the cement casting fixed part (not shown in the Figure). The invention simplifies the water of the inner layer of the prior art sleeve structure, the simplified water of the inner layer of the sleeve 2 the thickness of the ice control the length of the 4 inner, against the force of sea ice in winter, ice equivalent to the increase of this invention within the scope of the partial outer water-proof casing 1 of the thickness, so as to effectively improve the outer water-proof casing 1 within the range of the ice the rigidity of the side stress resisting part, for increasing the surface casing 3 of the protection. A and with reference to Figure 2-Figure 5, in the vicinity of the near the sea level local surface casing 3 is provided with a simplified sleeved water of the inner layer of the sleeve 2, the inner layer water-proof casing tube 2 respectively of the upper end part and lower end part of the surface casing 3 is fixed, so that the water tube is, the inner water-proof casing tube 2 with the surface casing 3 into the at the same time. In one embodiment, the inner layer water-proof casing tube 2 respectively of the upper end part and lower end part of the connecting joint 5 and the surface casing 3 is fixed, is connected with the joint 5 of the structure and and their connected manner is: connecting joint 5 comprises an inner fixed tube 6 and outer fixed tube 7, the inner fixed tube 6 and outer fixed tube 7 is connected with a plurality of interval between the connecting plate 8, the adjacent connecting plate 8 is formed between the guide hole 9. Inner fixed tube 6 and outer fixed tube 7 have screw thread, the inner fixed tube 6 and the surface casing 3 is screwed, the outer fixed tube 7 and the inner layer water-proof casing tube 2 is screwed, is connected with the joint 5, the surface casing 3 and the inner layer water sleeve 2 is in line with the thread on the standard API good should. Because this invention the adjacent connecting plate 8 is formed between the guide hole 9, guide hole 9 the water casing can be so as to cause the inner layer 2 of the inner, is communicated between the outside, so as to satisfy the fluid, flow and the return flow of the cement slurry. Preferably, connection joint 5 of the inner fixed tube 6 and the outer fixed tube 7 is also arranged between the plurality of reinforcing ribs 10, so that the inner layer of water-proof casing tube 2 and the surface casing 3 are connected more firmly. The invention Figure 4, Figure 5 the illustrated embodiment, connecting joint 5 is provided with eight connecting plate 8 and four reinforcing ribs 10. The invention anti-ice water sleeve combined structure after installation is complete, outer water-proof casing 1 and the inner layer water-proof casing tube 2 the annular space between, the inner layer and the water casing 2 and the surface casing 3 in the annular space between the cement (not shown in the Figure) pouring consolidation, in order to avoid the water pipe the inner layer of the prior art 2 the drilling depth of the defects is not easy to control, and reduce the material consumption the sleeve, the outer water-proof sleeve pipes local range of ice 1 bending rigidity. Specific realize the process is: 1) the outer water-proof casing 1 into the rear, the use of a bit in drilling from the outer water-proof casing 1 inside a wellbore is drilled, the depth of the borehole is slightly more than a surface casing 3 the length of the fixing, the drill bit is less than the diameter of the outer water-proof casing 1 of the inner diameter, and is greater than the surface casing 3 outer diameter. 2) drill the well bore, the inner layer of the pre-assembled water-proof casing tube 2 and the surface casing 3 under the combined structure into a wellbore. 3) the combined structure, first from the surface casing 3 into a certain amount of fluid within the surface casing 3 the external annuli for cleaning, and then into the cement slurry, cement paste through the surface casing 3 to return to the bottom of the surface casing 3 between the annulus of the wellbore. 4) use the replaces the fluid surface casing 3 all of the cement slurry inside the ejection surface casing 3 internal, wherein the amount of the cement slurry to the scientific computing, ensure that the cement slurry surface casing 3 in the annular space between the wellbore to reach the height of the water casing 2 at least above the top of the 3 m position. In this way since the guide hole 9 role of, the water in the casing 2 with the internal surface casing 3 is filled with the cement slurry between the, outer water-proof casing 1 and the inner-layer water-proof casing tube 2 are all filled with the cement slurry. Waiting for the cement slurry is solidified after a certain period of time, in this three column consolidation of the cement is formed between, so as to cause the section of the pipe string combination structure of the anti-ice capacity is greatly improved. Outer water-proof sleeve of the present invention 1, the inner layer water sleeve surface casing 2 and 3 various specifications and types of, size parameter according to the specific implementation to set up. For example, outer water-proof casing 1 can be selected the inner diameter of 36 inches or 30 inch, the inner water-proof casing tube 2 can be selected the inner diameter of 24 inches or 20 inches, the surface casing 3 can be selected the inner diameter of the Inches or Inch, according to the need for properly combined, a specific embodiment of the present invention in, outer water-proof casing 1, the inner layer water-proof casing tube 2, the surface casing respectively 30 inches, 20 inches, Inch, in order to guarantee better anti-ice capacity. In this invention the inner water-proof casing tube 2 is greater than the thickness of the sea ice the length of the, range set up and corresponds to the ice, an inner water-proof casing tube 2 length should be controlled within a reasonable range, the analysis result of the strength calculation and stability, preferably, after the installation of water of the inner layer of the sleeve 2 is higher than the top of the sea level 3-8 m, an inner water-proof casing tube 2 shall be controlled in the underwater length 5-8 meters. In a particular embodiment, the inner layer water-proof casing tube 2 is about the length of 10 m, and its water, underwater the length is about 5 meters, in order to provide better strength and stability. Furthermore, the inner layer water-proof casing tube 2 should meet the thickness of the wall of the anti-ice the strength requirement, the thickness range of 20-51mm, in a particular embodiment, the inner layer water-proof casing tube 2 has a thickness of 25 mm. For this invention the stated above with a specific embodiment of the illustrative, and not to limit the scope of protection of this invention. Any those of skill in the art, without departing from the idea of the invention and the technical scheme of the premise that of equivalent variation and modification made, should be in the present invention within the scope of protection. The invention discloses an anti-icing conductor tube composite structure. The anti-icing conductor tube composite structure comprises a surface casing and an outer layer conductor tube as well as an inner layer conductor tube; wherein the outer layer conductor tube is arranged outside the surface casing, the inner layer conductor tube is arranged between the outer layer conductor tube and the surface casing corresponding to ice region, the length of the inner layer conductor tube is less than the length of the outer layer conductor tube and is more than the thickness of the ice region, the thickness of the outer layer conductor tube is locally increased at the ice region, and annular part between the outer layer conductor tube and the inner layer conductor tube and the annular part between the inner layer conductor tube and the surface casing are all solidified by cement pouring. In the invention, the inner layer conductor tube and the surface casing are fixedly connected, the defect that the hammering-in depth of the inner layer conductor tube is difficult to control is avoided, and meanwhile material utilization amount is reduced, and flexural rigidity of local conductor tube in ice region is improved. The invention can effectively improve the anti-icing capacity of conductor tube, has no influence on drilling construction period and can save a lot of project expenses. 1. An anti-ice-water casing combined structure, includes a surface casing, a sleeve is disposed on the surface layer of the outer layer of the sleeve outside of the water casing, characterized in that a thickness in the range corresponding to the ice, the water in the outer layer of the sleeve and the surface casing is clamped between an inner layer of water-proof casing tube; Water of the inner layer and the outer layer is smaller than the length of the quill of the water and the length of the quill states the ice area greater than the thickness; The inner layer of the outer water-proof casing and water string part of the annular space between, the inner layer and the surface layer of water between the sleeve and the annular portion of the sleeve in order to cement pouring consolidation. 2. Anti-ice water pipe combination structure according to Claim 1, characterized in that the inner layer water pipe respectively connected with the upper part and the lower part of the sleeve is fixedly connected with the surface layer, the surface layer and into the sleeve at the same time. 3. Anti-ice water pipe combination structure according to Claim 1 or 2, characterized in that the inner water the two ends of the sleeve respectively and the surface casing through connection joint threaded connection. 4. Anti-ice water pipe combination structure according to Claim 3, characterized in that said connection joint comprises an inner fixed tube and an outer fixed tube, the inner fixed tube and the outer fixed tube is provided with a plurality of interval between the connecting plate, the connecting plate of the adjacent hole is formed between, the inner fixed tube through the screw thread on the upper end of the casing with the surface layer, the outer header through the screw thread at the lower end of the water casing and is connected with said inner layer. 5. Anti-ice water pipe combination structure according to Claim 4, characterized in that the said connection joint of the fixed tube and the outer fixed tube is also arranged between the two or more reinforcing ribs. 6. -5 any of the anti-ice water pipe combination structure according to Claim 1, characterized in that the inner water of the sleeve is higher than the sea level 3-8 m, the inner layer and the length of pipe underwater water jacket 4-8 meters. 7. Anti-ice water pipe combination structure according to Claim 6, characterized in that the inner water the drive pipe is long 10 meters, and the water, underwater length equal to 5 meters. 8. -5 any of the anti-ice water pipe combination structure according to Claim 1, characterized in that the inner water the thickness of the sleeve in the range of 20-51mm. 9. Anti-ice water pipe combination structure according to Claim 8, characterized in that the inner layer and the thickness of the water casing 25 mm. 10. -5 any of the anti-ice water pipe combination structure according to Claim 1, characterized in that the inside diameter of the outer water-proof sleeve pipes 30 inches, the inner water tube inner diameter is 20 inch, the inside diameter of the surface casing Inch.