Branch wellbore window sidetrack drilling plugging device and method
A plugging device and branch well technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problems of complex structure, high salvage risk, and inability to achieve full bore diameter, etc. High structural stability, reducing the risk of salvage and improving operational efficiency
Active Publication Date: 2019-06-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
In practical application, there are the following problems. First, the tilter system has its own functions such as anchoring and debris collection, and its structure is complex. Because the upper part is a slope, and the lower part is equipped with anchoring and sealing mechanisms, the risk of salvage is extremely high. Second, the support type sealing The packer is a permanent packer, and the wellbore cannot be full bore
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[0036] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0037] The device and method for sidetracking sidetracking and plugging of branch wells according to the present invention are mainly used in the process of sidetracking branch wells in cemented main wells. First of all, the removable two-way pressure-bearing plugging plug is lowered. Compared with the traditional single-slip packer, the removable two-way pressure-bearing plugging plug can withstand two-way forces, and the anchoring is more reliable and less prone to displacement, which is convenient for later stages. Positioning of lateral wells. Since this plug is desirable, it can be removed after the plugging function is complete, preserving the full borehole. A torsion-bearing joint is arranged on the upper part of the blocking bridge plug, which can be docked with the skewer to prevent the tilter from rotating and keep it at a fixed angle. The bridge plug can ...
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The invention provides a branch wellbore window sidetrack drilling plugging device and method, which belong to the field of exploitation of petroleum and natural gas. The branch wellbore window sidetrack drilling plugging device includes a bridge plug, a torsion bearing joint, a whipstock, and a screwing joint; the lower part of the whipstock is connected with the upper part of the screwing joint,and the outer wall of the screwing joint is provided with splines; the upper part of the bridge plug is connected with the lower part of the torsion bearing joint, and the inner wall of the torsion bearing joint is provided spline grooves; and when the screwing joint is inserted into a center hole of the torsion bearing joint, and the splines on the screwing joint is inserted into the spline grooves on the torsion bearing joint. The device and the method have the characteristics of greatly simplifying a structure of a whipstock system, and greatly reducing a risk of fishing of the whipstock.In addition, since the bridge plug can be taken out after operation is completed, the full drift diameter of a wellbore can be retained, and great convenience is provided for later work.
Description
technical field [0001] The invention belongs to the field of petroleum and natural gas exploitation, and in particular relates to a sidetracking plugging device and method for opening windows in branch wells. Background technique [0002] With the development of oil field production technology, sidetracking of old wells or new wells has become an important way to enhance oil recovery. In the branch well technology, drilling several branch wells in the wellbore increases the drainage area and improves the oil well production. The drilling method mainly used in the prior art is often to sidetrack the sub-wellbore by using a running tool in the casing of the main wellbore to run a plugging tool and a skewer system after the main wellbore is drilled. The purpose of the plugging tool is to prevent the interaction with the original wellbore when drilling the branch wellbore. The skewer is to mill the side of the casing with a certain direction, realize window opening, and guide th...
Claims
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Inventor 岳慧何同段友智
Owner CHINA PETROLEUM & CHEM CORP