Pressure testing method for segmented oil pool and segmented trial-squeezing tubing string

A technology for reservoir pressure and testing methods, which is applied in the directions of measurement, earthwork drilling and production, cleaning equipment, etc., can solve problems such as lack of applicability, distortion of pressure measurement data, long construction period, etc., and achieve simple and fast calculation methods and reduce testing costs. Cycle, the effect of shortening the test cycle

Active Publication Date: 2016-07-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology belongs to the direct test of wellbore production flow pressure, and cannot be used for reservoir pressure test
To obtain the reservoir pressure, it is calculated based on the pressure recovery time of 15-20 days for each well shut-in, and the average time for each well is 120-160 days. data distortion
At the same time, this technology is only applicable to high liquid volume horizontal wells. For low liquid volume horizontal wells, the segmental pressure calculation error is relatively large, and each segment needs to be interpreted by special reservoir pressure interpretation software, which takes a long time and costs high
For repeated stimulation of horizontal wells, the utilization rate of oil wells is low, and it is not representative for obtaining horizontal well segmented reservoir pressure
[0005] To sum up, the existing me

Method used

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  • Pressure testing method for segmented oil pool and segmented trial-squeezing tubing string

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Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this embodiment provides a segmented test squeeze tubing string, including hydraulic anchor 3, Y111-type packer 4, tubing adjustment nipple 5, pressure-guiding sandblasting device 6, and Y211-type packer connected in series. The device 7, the guide 8, and the hydraulic anchor 3 are connected with the oil pipe 9 through the safety joint 1.

[0033] The segmented test squeeze tubing string mainly adopts the Y211+Y111 double-sealed single card test squeeze test integrated tubing string, which is set and unsealed by lifting the string up and down, which can not be affected by the construction displacement. Segment test extrusion, segmental pressure drop test can also be carried out.

[0034] The working process of the segmented test squeeze string is as follows: Step 1, connect the segmented test squeeze string to the tail of the tubing 9, and run the tubing 9 into the horizontal well so that the segmented test squeeze string is located at the fi...

Embodiment 2

[0044] Such as figure 1 As shown, a pressure gauge 10 is installed on the oil pipe adjustment sub-joint 5, and the pressure measurement by stopping the pump in step 3 can be performed by using an instrument truck or by using the pressure gauge 10 to record the bottom-hole pressure drop data;

[0045] A centralizer 2 is connected in series between the hydraulic anchor 3 and the tubing 9. The centralizer 2 is connected to the tubing 9 through a safety joint 1. The centralizer 2 can ensure the quality of drilling and cementing. In this embodiment, the specific protection is The position of the whole subsection test extrusion string does not deviate.

Embodiment 3

[0047] A segmented reservoir pressure testing method, comprising the steps of:

[0048] Step 1: Connect the segmental test squeeze tubing string to the tail of the oil tubing 9, and lower the tubing 9 into the horizontal well, so that the segmented test squeeze tubing string is located in the first fracturing section at the toe of the horizontal well to realize inter-stage isolation;

[0049] Step 2: Inject plugging-removing fluid into the first fracturing stage through the staged test squeezing tubing string, at a rate of 0-2m 3 / min displacement squeeze 15 ~ 30min;

[0050] Step 3: 1 to 2 minutes before the end of the squeeze, reduce the displacement step by step to zero, then stop the pump and measure the pressure for 1 to 2 hours, and use the instrument truck or pressure gauge 10 to record the bottom hole pressure drop data;

[0051] Step 4, lift up the segmented test extrusion tubing string to the next section, and repeat steps 2 and 3 to complete the second section of b...

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Abstract

The invention provides a pressure testing method for a segmented oil pool and a segmented trial-squeezing tubing string. The segmented trial-squeezing tubing string comprises a hydraulic anchor, a Y111 type packer, an oil pipe adjusting short section, a pressure guiding sand blower, a Y211 type packer and a guider which are sequentially connected in series. The hydraulic anchor is connected with an oil pipe through a safety joint. A wellbore and a blocked reservoir stratum nearby cracks are cleaned through blockage removing fluid, the initial transformation situation is judged to serve as a subsequently conducted repeated fracturing design basis, the average time of single-segment trial-squeezing pressure testing is 3 h, the testing period is effectively shortened, and the construction efficiency is improved; the calculation method is simple and rapid, and no special interpretation software is needed; and the problems that direct segmented oil pool pressure testing conducted on a horizontal well is long in consumed time, high in cost and the like, and the segmented oil pool pressure of the horizontal well cannot use the vertical well testing method are solved, so that the testing period is shortened.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a segmented oil reservoir pressure test method and a segmented test extrusion tubing string for fractures in an old well of a low-permeability oil reservoir horizontal well before recompression. Background technique [0002] Low-permeability reservoirs usually need to be effectively developed by adopting the "horizontal well + staged fracturing" stimulation method, and the initial single-well production can usually reach 8-10 tons. However, with the prolongation of time, due to the low degree of initial stimulation or the inability to establish effective displacement in the reservoir, the productivity of a single well in the initial period decreases by 20% to 30% every half year, and by 30% to 50% after one year. The decline is still as high as more than 40%, the production decline is large, and the proportion of low-production wells accounts for more than 30%. [0003]...

Claims

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Application Information

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IPC IPC(8): E21B43/14E21B47/06E21B37/06
CPCE21B37/06E21B43/14E21B47/06
Inventor 苏良银陆红军卜向前庞鹏白晓虎达引朋赵伯平吴甫让段鹏辉黄婷董奇顾燕凌蒙鑫田文超
Owner PETROCHINA CO LTD
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