Gap cap entrapment composite well completion method

A composite, gas-cap technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as low productivity and increase seepage area, and achieve increased seepage area, straight streamline, The effect of improving the productivity of a single well

Active Publication Date: 2017-08-01
CHENGDU NORTH OIL EXPLORATION DEV TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite well completion method for gas cap traps, so as to solve the problem in the prior art that the well completion methods for gas cap traps easily lead to low productivity, and to increase seepage area and single well productivity the goal of

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  • Gap cap entrapment composite well completion method
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Embodiment 1

[0022] Such as figure 1 and figure 2 The compound well completion method of the gas cap trap shown includes the following steps: (a) perform second drilling operation, drill into the stratum above the gas cap, install technical casing, cement, hold, and pressure test; ( b) After passing the pressure test, carry out three-split drilling operations until the wellbore passes through the gas cap and the reservoir, and enters the formation below the reservoir to complete the drilling; The hanger is located in the upper technical casing, and the liner shoe is located inside the reservoir; (d) the liner section is cemented and sealed, and the sealing section extends from the shoe to the liner hanger without interruption; (e) Hou Ning , run down the drill to open the cement plug at the liner shoe, pass the well to the bottom of the well, and pull out the drill; (f) run down the perforating gun to the liner section in the reservoir, and perform perforating operations. The distance b...

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Abstract

The invention discloses a gap cap entrapment composite well completion method. The method comprises the following steps of (a) performing an Nth well drilling operation to the upper stratum of a gas cap, running in technical casing pipes, performing well cementation, cementation waiting and pressure test, wherein N>=1; (b) after pressure is tested to be qualified, performing an (N+1)th well drilling operation until penetrating the gas cap and a reservoir and reaching the lower stratum of the reservoir to finish drilling; (c) in the (N+1)th well, running a tail pipe into an upper casing pipe, and running the pipe shoe of the tail pipe into the reservoir; (d) cementing the tail pipe section for well cementation to extend the cemented section to the tail hanger of the tail pipe; (e) performing cementation waiting, drilling a cement plug at the tail shoe of the tail pipe until reaching the well bottom, and pulling out of hole; (f) running a perforating gun into the tail pipe section inside the reservoir to performing perforating operation. The gap cap entrapment composite well completion method is applied to solving the problem that gas cap entrapment well completion manners in the prior art are prone to lead to low productivity, and achieving the aim of increasing the seepage area and improving the single well productivity.

Description

technical field [0001] The invention relates to the field of well completion of oil and gas wells, in particular to a composite well completion method for gas cap traps. Background technique [0002] In oil and gas reservoirs, oil, gas, and water often coexist in the same trap, and are vertically distributed according to different densities. Natural gas with the lightest density occupies the top of the trap, so it is called the gas cap. There are cap rocks at the top of the trap, and the cap rock is generally composed of tight mud shale. For the reservoir in the trap, the free gas inside the reservoir will diffuse upwards to the cap rock after overflowing, so if the reservoir If there is a gas cap above the formation, it is easy to form an abnormally pressured formation, which increases the difficulty of drilling engineering and later mining. Therefore, in the prior art, for traps with gas caps, the general practice is to directly drill through the gas cap and the reservoir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/11E21B33/13
CPCE21B33/13E21B43/11E21B43/16
Inventor 王鹤米中荣李建东万丽娟岑玉达符奇
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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