Static pressure sidetracking device and improvement method for pinnate lateral wells
A branch well and sidetracking technology, which is applied in drilling equipment and methods, directional drilling, earthwork drilling, etc., can solve the problems of high cost, long construction period of multilateral wells or fishbone wells, and only one sidetracking can be formed. Problems such as branch wells or fishbone wells
Active Publication Date: 2019-08-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, the existing sidetracking tools can only form one branch well or fishbone well each time they sidetrack, which makes the construction period of multi-branch wells or fishbone wells longer and the cost is high
[0004] Therefore, how to solve the problem that the existing sidetracking tool can only form one branch well or fishbone well is a technical problem that those skilled in the art need to solve
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[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] Such as figure 1 As shown, the hydrostatic sidetracking device for a pinnate lateral well of the present invention includes a pipe string 1 for lowering into a lateral well reservoir and a drill pipe 2 arranged in the pipe string 1 for drilling a lateral well in the reservoir . The top of the pipe string 1 is provided with a liquid inlet 6 for receiving liquid, so that hydraulic pressure can be formed through the liquid during sidetracking. The bottom of the pipe string 1 is provided with at least two drilling holes 7 facing different directions, and at least two drill pipes 2 protruding from different drilling holes 7 are arranged in the pipe string 1. When sidetracking branch wells, each drill Rod 2 advances toward the reservoir of the lateral well under the action of hydraulic pressure to complete sidetracking. Through the above-mentioned setting, simultaneous ...
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The invention provides a static pressure sidetrack drilling device of a pinnate branch well. The static pressure sidetrack drilling device of the pinnate branch well comprises a pipe column and a drill pipe, wherein the pipe column is used for being released to a branch well reservoir; at least two drill-out holes in different directions are formed in the side part of a pipe body; a liquid inlet used for receiving liquid is formed in the top of the pipe column; the drill pipe is arranged in the pipe body; one end of the drill pipe extends to the outer side from the drill-out holes; each drill-out hole is provided with at most one drill pipe; and the drill pipe is constructed into a state of being capable of propelling towards the branch well reservoir under the pressure effect of liquid injected into the pipe column in the reservoir transformation process. Therefore the simultaneous sidetrack drilling of at least two branch wells can be realized; at least two oil gas passages are formed after the once sidetrack drilling; the reservoir can be communicated to the maximum degree; and the device is particularly applicable to a carbonatite reservoir.
Description
technical field [0001] The invention relates to the technical field of reservoir reformation, in particular to a hydrostatic sidetracking device for a pinnate branch well, and also relates to a reservoir reformation method. Background technique [0002] Branch wells and fishbone wells are an effective technical method to enhance oil recovery, which can increase the oil and gas drainage area and the number of oil and gas passages, and increase the controlled reserves of a single well. Existing branch wells and fishbone wells are mainly realized through conventional drilling, which belong to the category of complex structure wells. The technical approach is mainly to run the sidetracking tool at the designed position after the completion of the main wellbore (vertical well, directional well, horizontal well), to form a branch well or fishbone well, and to complete the branch well or fishbone well. After drilling, the sidetracking tool is lowered into another designed position...
Claims
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IPC IPC(8): E21B7/06E21B43/27
CPCE21B7/06E21B43/26E21B7/061
Inventor 马兰荣赵晨熙戴文潮程光明韩峰李夯邵志香
Owner CHINA PETROLEUM & CHEM CORP