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Method for testing strata of horizontal well

A technology for formation testing and horizontal wells, which is used in earth-moving drilling, wellbore/well components, and valve devices for wells/wells, etc. It can solve the problems of excessively long assembly length and unsuitable horizontal well formation testing.

Active Publication Date: 2010-08-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the assembly length of the above two formation testers is too long (more than 10m), and the packers are all sealed by lifting and lowering strings, so they are not suitable for formation testing in horizontal wells

Method used

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  • Method for testing strata of horizontal well
  • Method for testing strata of horizontal well
  • Method for testing strata of horizontal well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Taking a horizontal well formation testing process string as an example, the present invention will be further described in detail.

[0048] refer to figure 1 The horizontal well formation testing process string of the present invention is mainly composed of oil pipe 2, reverse circulation valve 4, oil pipe hydraulic control 5, oil pipe centralizer 6, pressure-controlled electric multi-flow test valve 7, annular hydrostatic packer 8, The screen pipe 9 and the guide cone 10 are composed.

[0049] The oil pipe 2 is 2 with an inner diameter of 62 mm 7 / 8 inE-U. The lower part of the tubing 2 is connected to the reverse circulation valve 4, which is cylindrical and located at the end of the vertical well section. Its function is to open the reverse circulation valve with the help of external force after the test, and perform positive and reverse circulation well washing and well killing. The lower end of the reverse circulation valve 4 continues to be co...

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PUM

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Abstract

The invention relates to a method for testing strata of a horizontal well, which is applied to the test of the strata of a horizontal well during casing well completion. The method comprises the steps of: setting parameters for a voltage-controlled electric multi-stream test valve, and putting the test valve into a casing of an oil well; performing the settlement of an annulus hydrostatic packer;performing annulus pressurization on an oil jacket by utilizing a pumper on the ground to realize well opening and well closing; completing sampling operation during the last closing operation, and simultaneously, recording the variation conditions of pressure and temperature in the overall process of construction by a pressure gauge in a pressure gauge support cylinder of the voltage-controlled electric multi-stream test valve; opening a reverse circulation valve by utilizing an external-force punch, deblocking the annulus hydrostatic packer by lifting a pipe column upwards to lift a stratumtesting pipe column and a mating tool safely. The method has the advantages that in a process pipe column for testing the strata of the horizontal well, the settlement of the packer is performed by utilizing the pressure of a casing annulus hydrostatic column, so that other stratum sections and well completion liquid are isolated from a test layer; and ground pressure pulse signals control the voltage-controlled electric multi-stream test valve to realize the well opening and well closing operation.

Description

technical field [0001] The invention relates to the technical field of oil and gas field formation testing, in particular to a method for horizontal well formation testing and a special downhole testing pipe string thereof. Background technique [0002] At present, there are no special tools and techniques for horizontal well formation testing in China. There are two mature and widely used formation testing technologies for vertical wells, one is the MFE formation tester, and the other is the full bore APR formation tester. [0003] MFE formation tester, it is a complete set of test tool system, including MFE multi-flow tester, bypass valve and safety seal slip packer (P-T), etc.; the packer is composed of bypass, sealing element and The slip assembly consists of three parts. The function of the bypass is that when tripping, the completion fluid passes through the bypass valve from the inside of the pipe string, thereby reducing tripping resistance and swabbing, and at the...

Claims

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Application Information

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IPC IPC(8): E21B49/08E21B33/128E21B33/129E21B34/08
Inventor 王凤清夏健刘蜀平余东合陈雄亮徐克彬
Owner PETROCHINA CO LTD
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