Extending method of horizontal well safe density window

An expansion method and technology for horizontal wells, which are applied in the field of expanding the safe density window of oil horizontal wells, can solve the problems of large frictional resistance of fiber particles, high content of loss-stopping agent, sliding viscosity of drill bits, etc. Reduce the effect of scour

Active Publication Date: 2015-06-17
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] 3. The content of lost circulation agent in the drilling fluid is high, the friction caused by fiber particles is large, the sliding viscosity of the PDC drill bit is serious, the under pressure is serious, and the construction efficiency is low

Method used

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  • Extending method of horizontal well safe density window

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Embodiment 1

[0027] This embodiment provides a method for extending a safe density window of a horizontal well, comprising the following steps:

[0028] Step 1) In the 8 3 / 8" wellbore, enter the leakage-prone formation 100 meters before the 4+5 layers, and gradually add the following components through the drilling pump according to the mass volume percentage in each 100 cubic meters of drilling fluid according to the circulation cycle, bentonite Powder 1.5%, sawdust 1%, plugging agent 1%, mica powder 1%;

[0029] Step 2) After entering the leakage layer, reduce the displacement of the drilling pump from 34 L / s to 29 L / s, reduce the pressure loss of the annular space, and reduce the erosion of the well wall of the formation that is prone to leakage and collapse due to large displacement ;

[0030] Step 3) After the leaky layer is opened, control the ROP to less than 20m / h, and at the same time strengthen the solid phase control, remove the harmful solid phase in the drilling fluid in time...

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Abstract

The invention relates to an extending method of a horizontal well safe density window particularly. The extending method comprises the steps that 1 1.5% of bentonite powder, 1% of saw dust, 1% of blocking agent and 1% of mica powder are added into 100 squares of drilling fluid gradually in a borehole with a standard of 83 / 8''according to a mass-volume percent; 2 the displacement of a drilling pump is lowered when the drilling pump enters a leakage layer; 3 when the leakage layer opens, the rate of penetration is controlled, solid control is strengthened at the same time, and harmful solids in the drilling fluid are removed; 4 the well deviation in an oil shale section is controlled; 5, the orientation of the borehole is conducted with a roller bit. According to the extending method of the horizontal well safe density window, blocking agents of different granularity are added gradually through a mud system, the leak-proofing formula is improved, the concentration of the blocking agent when added into the well is guaranteed to be at 3%, blocking is strengthened, and the strength of a leaking well wall is improved; the displacement of the drilling pump is lowered, the expansion of a crack is prevented, and the collapse pressure of the balance oil shale section is lowered, so that the safe density window is extended.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a method for extending a safe density window of an oil horizontal well. Background technique [0002] Well Huang 36 area is located in Hongjingzi Township, Yanchi County, Ningxia Autonomous Region - Fengdikeng Township, Dingbian County, Shaanxi Province. It is one of the main blocks for large-scale production of oil horizontal wells in the third oil production plant of Changqing Oilfield in 2013. The development target layer is Chang 8. During the drilling of horizontal wells in the Chang 8 target layer, the Chang 7 oil shale section is long and the well deviation is large and easy to collapse; the Chang 4+5 formation has low pressure bearing capacity, and the drilling fluid density cannot reach the minimum density required to balance the oil shale ;The PDC drill bit is difficult to slide, and the ROP in the deflection section is low. The core of the block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B21/00E21B7/00
CPCE21B7/00E21B10/08E21B21/00E21B33/13
Inventor 吴付频南红军高龙王登治
Owner BC P INC CHINA NAT PETROLEUM CORP
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