Method for drilling spot plugging
A technology for drilling and plugging materials, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., which can solve the problem of loss of expansion space for plugging materials, difficulty in controlling the swelling speed when encountering water, and decline in plugging strength and other problems, to achieve the effects of slowing down expansion, good plugging effect, and improving compression resistance
Inactive Publication Date: 2010-10-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
However, it is difficult to control the swelling rate of these materials when encountering water. Sometimes the lost circulation plugging material has absorbed water and swelled before entering the predetermined formation. When the predetermined formation is reached, the volume of the expanded gel is already greater than the volume of fractures, pores and caves and cannot enter the formation. Voids, even if squeezed into the formation, the plugging material has lost the space for further expansion, and its plugging strength has seriously decreased, basically losing the purpose of plugging
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[0019] The present invention will be further described in detail through the embodiments below in conjunction with the accompanying drawings, but the embodiments will not constitute a limitation to the present invention.
[0020] After the assembly of the fixed-point plugging device for drilling, it is a technical short connection, wherein the upper joint 2 of the plugging device is the main body of the short connection, and the outer tube through hole 9 is radially processed on the lower part of the body (the three outer tube through holes are in the horizontal plane. 120 ° distribution), vertical through holes 17 and radial through holes 16 (3 radial through holes 16 are distributed at 120 ° in the horizontal plane), radial through holes 16 and vertical through holes 17 are connected, in order to facilitate processing and Ensure that the radial through hole 16 is connected with the vertical through hole 17, and the outside of the radial through hole 16 is sealed by the plug 8...
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The invention relates to a method for drilling spot plugging. An upper connector of a plugging device of a device for drilling spot plugging is connected with a drill column, and the upper part of the drill column is connected with a water tap which is connected with a mud pump by a water hose; after the device for drilling spot plugging descends to a leak point of a well wall, the mud pump is opened to pour liquid from the inside of a drill pipe so as to make a sliding sleeve in a plugging steel ball seal move downwards under the pressure of mud; under the action of the thrust of the sliding sleeve, a central slide bar moves downwards; a lower sealing baffle is opened; the sliding sleeve stops when arriving at the position of a limiting retainer ring; and the mud squeezes plugging materials into the stratum by radial through holes and vertical through holes to realize spot plugging and squeeze the plugging materials into the stratum. The method has the advantages that: the method for drilling spot plugging has strong plugging pertinence, can meet the requirement of common plugging, can regularly deliver expandable plugging materials to a leak stratum part, and improves the pressure resistance of the stratum plugged by the expandable plugging materials.
Description
technical field [0001] The invention relates to a method for fixed-point leakage plugging in well drilling. Background technique [0002] Lost circulation is a common and often encountered complex problem in petroleum engineering. Due to the complex downhole caused by lost circulation, it is extremely harmful to drilling and completion construction, and lost circulation has always been a concern of petroleum engineering circles at home and abroad. In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, and the oil and gas layers will be damaged, but it may also cause a series of complex situations and accidents such as well collapse, stuck pipe, blowout, etc. due to the instability of the well wall, and even lead to the failure of the wellbore. scrapped, resulting in major economic losses. [0003] During the drilling process, due to the complex formation, the formation pressure coefficient changes greatl...
Claims
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Inventor 窦斌
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)