Method for solving sticking in plug drilling of shale gas long horizontal well coiled tubing

A long-horizontal well and shale gas technology, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of complex wellbore trajectory bending, aggravating coiled tubing bending deformation, and encountering sticking, etc., to improve the success of unblocking rate, and the effect of reducing the risk of encountering cards

Inactive Publication Date: 2018-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the measured depth of shale gas horizontal wells generally reaches 4000-6000m, the wellbore trajectory is complicated to bend, and the downward pressure drilling and grinding will further aggravate the bending and deformation of the coiled tubing in the wellbore during the drilling plug operation; There is a change in diameter, and the accumulation of bridge plug debris or irregular shape during the process of drilling out the bridge plug may cause the body of the coiled tubing or get stuck at the change in diameter of the tool
In the early stage of development, the stuck coiled tubing drilling plug was caused by insufficient risk awareness of personnel and unreasonable methods, etc., which brought a huge well control safety risk to the drilling plug operation, so there is an urgent need for a system-integrated shale The stuck-free method of the coiled tubing drilling plug in the gas-length horizontal well is used to guide the process of the stuck-free operation, improve the success rate of stuck-free, and reduce the safety risk of well control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Bridge plug debris sticking

[0035] Example 1: The circulation channel was unblocked during the drilling of the plug, but it was blocked when the coiled tubing was lowered. It was preliminarily judged that the bridge plug debris was stuck, and the following methods were used to remove the jam: (1) Try to use method 1 to alternately inject 40-50mPa· s linear glue and 6-9mPa·s drag-reducing water were used to circulate and unblock without success. (2) Try to use the method 2 to remove the jam, and repeatedly lift and lower the movable string within the range of about ±8 tons. (3) When method 1 and method 2 cannot release the jamming, use method 3 to pump metal drag reducer to cover the entire horizontal section, reduce the friction force of the coiled tubing and the stuck place, and cooperate with method 2 to lift the tube The column is successfully unstuck.

Embodiment 2

[0036] Example 2: Downhole accumulation deposit buried pipe

[0037] Example 2 In the process of lifting the plug in the middle section of the drilling process, no attention was paid to the lack of exit at the wellhead, and the operation was not carried out in accordance with the standard operating procedures. Blind lifting resulted in jamming. The following methods were used to remove the jamming: (1) First, try to use method 2 to move the solution The card method, repeatedly lifting and lowering within the range of about ±8 tons, the lifting force gradually increased to the limit of 80% of the tensile strength, and intermittently tried Method 1 to establish a circulation channel without success. (2) If method 2 cannot be used to release the jam, try to use method 4 to release the jam, activate the coiled tubing downhole jar tool, use the principle of the jar to amplify the pulling force to try to release the jam, and try method 1 intermittently to establish loop channel. (3...

Embodiment 3

[0038] Example 3: The deformation of the casing causes the tool to be stuck

[0039] Example 3: In the process of plug drilling, repeated jamming and resistance were encountered, and the following methods were used to solve the jamming: (1) First, use method 1 to alternately pump 40-50mPa·s linear glue and 6-9mPa·s drag-reducing water for circulation Release the stuck, and return the bridge plug debris and wellbore grit to the wellhead. (2) According to the returning situation of the debris, try to use the method 2 to remove the sticking method, repeatedly lifting and lowering within the range of about ±8 tons, and the lifting force gradually increases to the limit of 80% of the tensile strength. (3) When method 1 and method 2 cannot be used to remove the stuck, try to use the method 3 to reduce the drag and remove the stuck, pump the metal drag reducer to cover the entire horizontal section, reduce the friction of the coiled tubing and the stuck place, and at the same time C...

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PUM

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Abstract

The invention discloses a method for solving sticking in plug drilling of a shale gas long horizontal well coiled tubing. The method comprises the following steps that 1, an unobstructed condition ofa circulation channel is judged according to wellhead pressure and a condition of reversing out debris; 2, a corresponding combined sticking solving method is adopted according to the type of sticking; and 3, if the sticking solving method in the step 2 is still unable to solve sticking, salvage sticking solving is adopted. In the initial stage of gas field development, situations such as stickingin coiled tubing plug drilling are caused by the facts that personnel risk consciousness is not enough and methods adopted are unreasonable, huge well control safety risks are brought to plug drilling operation, meanwhile, the situation that the gas well can not produce normally is caused, and in severe case, gas well scrap is even caused. By means of the method for solving sticking in plug drilling of the shale gas long horizontal well coiled tubing, the plug drilling construction personnel can be effectively instructed to operate according to requirement specification, the risk of stickingis reduced to be no more than 15, and the success rate of sticking solving is improved to be equal to or greater than 35%.

Description

technical field [0001] The invention relates to the technical field of downhole operations for oil field development, in particular to a combined method for unblocking when a coiled tubing is used for plug drilling in long horizontal shale gas wells. Background technique [0002] "Long horizontal well + drillable bridge plug staged fracturing" is the development mode and the two key technologies for commercial breakthrough of shale gas. After the staged fracturing of long horizontal well is completed, coiled tubing and downhole dynamic drilling tools are generally used Drilling and removing drillable bridge plugs. Compared with conventional tubing, the use of coiled tubing to drill and remove drillable bridge plugs is widely used because of its simple operation process, short construction period, and avoiding well control safety risks such as frequent tripping and tripping of pipe strings under pressure. in shale gas well operations. [0003] Since the measured depth of sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/00E21B31/03E21B31/107
Inventor 黄仲尧马莉高东伟刘立之廖如刚王汤张驰崔静徐苗黄艺
Owner CHINA PETROLEUM & CHEM CORP
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