A construction method for coiled tubing drilling and grinding operations in horizontal wells
A construction method and technology for horizontal wells, which can be used in earth-moving drilling, wellbore/well components, etc., and can solve problems such as oversize, blind drilling and pressurization, etc.
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Embodiment 1
[0033] This embodiment provides a drilling and grinding operation method for horizontal well coiled tubing, including the following steps:
[0034] Step 1) Check the ground and assemble the drilling and grinding tool strings, test the performance of the motor, and enter the well after passing the test;
[0035] Step 2) After lowering the drilling and grinding tool pipe string to a distance of 50-100m from the kickoff point, start pumping with the minimum displacement allowed by the motor, and run the coiled tubing while pumping;
[0036] Step 3) After entering the horizontal section, increase the pump injection displacement to the rated maximum displacement of the motor;
[0037] Step 4) Lift and lower the coiled tubing within 200-300m of the top boundary of the drilled object to clean the wellbore. After the liquid return is continuous and stable and the pump pressure fluctuation is less than 0.5MPa, stop lifting and lowering the coiled tubing, and run the coiled tubing smoot...
Embodiment 2
[0048] On the basis of Embodiment 1, this embodiment provides a drilling and grinding operation method for horizontal well coiled tubing, the drilling and grinding tool string is composed of a coiled tubing joint, a one-way valve, a hand tool, a shock tool, a motor , grinding shoes or drill bits are connected from top to bottom.
[0049] like figure 1 shown, the P 1 2 n-1 n , and P n n-1 , P n and P 1 The difference is less than the motor rated maximum pressure drop, the P 1 2 n-1 , and P n n ≤1.01P n , n is a positive integer.
[0050] The L n-1 ≥1.1L n-2 , n is a positive integer ≥ 3.
[0051] The T 1 >T 2 >T 3 >…>T n , and T n-1 n , the T 1 >T 2 >T 3 >…>T n-1 , and T n n ≤1.01T n , n is a positive integer.
[0052] Among them, the pump pressure P in step 4) 1 and suspension weight T 1 , which is the pump pressure and suspension weight measured on the ground when the performance of the working fluid is stable, the pump injection displacement is stab...
Embodiment 3
[0060] On the basis of Embodiment 2, this embodiment provides a drilling and grinding operation method for a horizontal well in Changqing Oilfield by using coiled tubing in a horizontal well. The diameter of the production casing in this well is 124.26mm, and the length of the horizontal section is 1200m. There are 8 composite bridge plugs set in the horizontal section. The length of a single composite bridge plug is about 70cm, and the average distance between the composite bridge plugs is about 125m. Coiled tubing with an outer diameter of 50.8 mm is used for drilling and grinding, and the drilling and grinding tool assembly is composed of a core tool motor, grinding shoes and other auxiliary tools.
[0061] Run down the coiled tubing, continuously deepen the depth of the grinding shoe, and explore the position of the 1# bridge plug. After reaching the position, lift up the coiled tubing to clean the wellbore until the return fluid is continuous and stable, and the fluctuatio...
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