Method for evaluating stratum working parameters applicable to a radial well through jet drillability

A working parameter, radial well technology, used in liquid/gas jet drilling, earthwork drilling, wellbore/well components, etc., which can solve the problem of failure to achieve expected results, bending and resistance, and easy collision of the front end of the nozzle. Problems such as upper stratum rocks, to achieve good guiding and righting effect, good effect

Inactive Publication Date: 2019-04-09
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

If the rock-breaking speed is lower than the feeding speed, the front end of the nozzle is likely to collide with the rocks in the upper strata, causing bending and resistance; The righting and guiding function is lost, and the nozzle cannot maintain directional drilling in the formation, resulting in the failure of the operation to achieve the expected effect

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  • Method for evaluating stratum working parameters applicable to a radial well through jet drillability
  • Method for evaluating stratum working parameters applicable to a radial well through jet drillability
  • Method for evaluating stratum working parameters applicable to a radial well through jet drillability

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Embodiment Construction

[0024] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0025] The embodiment of the present invention provides a method for evaluating the applicable formation working parameters of radial wells by jet drillability, including the following steps:

[0026] Step 10, according to the hardness of stratum rock sample, stratum rock sample is divided into loose stratum, medium hard stratum and hard stratum;

[0027] Step 20. When the stratum rock sample is a loose formation, use the self-traction deepening drilling tool to drill, the self-traction deepening drilling tool is connected with the coiled tubing, and the coiled tube is lowered and sent, and the self-traction deepening drilling tool is set having a first spray hose;

[0028] When the stratum r...

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Abstract

The invention provides a method for evaluating stratum working parameters applicable to a radial well through jet flow drillability. The method comprises the steps that step 10, a stratum rock sampleis divided into a loose stratum, a medium-hard stratum and a hard stratum; step 20, when the stratum is the loose stratumm, a self-traction deepening drilling tool is adopted for drilling, the self-traction deepening drilling tool is connected with the coiled tubing, the coiled tubing is lowered and fed in, and a first spraying hose is arranged on the self-traction deepening drilling tool; when the stratum is a medium-hard stratum, a stepping type deepening drilling tool is adopted for drilling, the stepping type deepening drilling tool comprises a hydraulic cylinder piston rod and a crawlingmechanism, the stepping type deepening drilling tool conducts feeding through the hydraulic cylinder piston rod and the crawling mechanism, and a second spraying hose is further connected to the stepping type deepening drilling tool; when the stratum is a hard stratum, the near-wellbore zone drilling tool is adopted for drilling, the near-wellbore zone drilling tool is provided with a hydraulic cylinder piston rod, the near-wellbore zone drilling tool is fed in through the hydraulic cylinder piston rod, and the near-wellbore zone drilling tool is provided with a third injection hose.

Description

technical field [0001] The invention relates to the field of radial well drilling operations with water jets, in particular to a method for evaluating the working parameters of strata suitable for radial wells by jet drillability. Background technique [0002] At present, in the domestic and foreign oilfield exploitation industry, the water jet drilling radial well operation technology is mainly used for the secondary development of oil and gas wells, and has a significant increase in production for the reconstruction of low-permeability reservoirs and the reconstruction of contaminated layers near the well. For coalbed methane wells, it has the effect of increasing single well production. [0003] The invention belongs to the technical field of drilling and completion of conventional oil and gas wells and coal bed gas wells, in particular to the operation of drilling radial wells with water jets. At present, in the domestic and foreign oilfield exploitation industry, the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B49/00
CPCE21B7/18E21B49/00
Inventor 胡强法陈智张友军张炎贾夏徐云喜黄志刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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