Shale gas horizontal well proppant in-crack shielding and temporary plugging staged fracturing process

A technology for staged fracturing and horizontal wells, which is applied in wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve the problems that perforating tools cannot be lowered, reduce the risk of subsequent construction, and achieve stable and reliable perforation , the effect of low size requirements

Active Publication Date: 2016-12-14
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention applies multi-cluster sandblasting and perforating of coiled tubing combined with sand filling in fractures for temporary plugging and segmental fracturing, which can effectively solve complex problems such as casing shrinkage and other problems that mechanical bridge plugs and perforating tools cannot be lowered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A staged fracturing process for shielding temporary plugging in a proppant fracture in a shale gas horizontal well, comprising the following steps:

[0028] (1) Run the coiled tubing and sandblasting perforating tools into the section that needs fracturing, and after performing multiple clusters of perforation, take out the coiled tubing and perforating tools;

[0029] (2) Set the highest safe pump pressure on the ground, carry out main fracturing, and promote volumetric fractures in the reservoir;

[0030] (3) When the injection volume reaches 1600~1800m 3 Then, pump the proppant slug for temporary plugging;

[0031] (4) When the slug for sand filling enters the formation hole, reduce the injection displacement until all the sand plugs enter the formation;

[0032] (5) If the wellbore pressure rises to more than the maximum safe pump pressure set on the ground (the pressure exceeds the normal construction pump pressure of the main fracturing by more than 15MPa), the ...

Embodiment 2

[0040] By adopting the present invention, firstly, the ground preparation work is carried out according to the construction requirements;

[0041] Run the coiled tubing with flushing head and sandblasting perforating tools to clean the wellbore and correct the depth, and perform the first cluster of sandblasting and perforating operations, and then drag the coiled tubing string to perform multiple clusters of sandblasting and perforating operations in sequence. , take out the coiled tubing when finished.

[0042] By means of casing injection, the main fracturing construction is carried out by applying the fracturing process of large displacement, large liquid volume, and slick water carrying sand, and temporary proppant plugging measures in artificial fractures are carried out at the end of the main fracturing construction to increase the concentration of the trailing proppant. , after the high-concentration proppant enters the reservoir pores, reduce the construction displace...

Embodiment 3

[0045] Well YS-1 was completed at the Longmaxi Formation in the Silurian system, and was completed with a 139.7mm oil layer casing. The well is completed at a depth of 4517m, with a maximum inclination of 93.02゜ and a vertical depth of 2561.68m. The target entry point is located at 3017m, the target exit point is located at 4517m, and the horizontal section is 1500m long. The reservoirs encountered in Well YS-1 have good physical properties, with an average effective porosity of 3.9%, an average TOC of 3.6%, and an average total gas content of 4.8m 3 / t, the reservoir brittleness index in the horizontal section is higher. The triaxial stress of the reservoir is characterized by strike-slip faults, the difference between the maximum and minimum horizontal principal stresses is large (greater than 15MPa), and the distribution of natural fractures is complex.

[0046] The well is designed to apply the 14 sections of the fracturing construction of the present invention, and the s...

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PUM

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Abstract

The invention discloses a shale gas horizontal well proppant in-crack shielding and temporary plugging staged fracturing process. The process includes following steps: lowering a continuous oil pipe and a sand blasting perforation tool a layer section needing fracturing modification, performing multi-cluster perforation, and lifting up the continuous oil pipe and the perforation tool; setting highest safe pumping pressure on the ground, and conducting main fracturing to promote a reservoir to generate a size crack; after injection liquid quantity reaches 1600-1800m3, pumping a proppant section plug for temporary plugging; after the section plug used for sand filling enters a stratum hole, lowering injection displacement until a sand plug completely enters a stratum; if shaft pressure rises to the highest safe pumping pressure set on the ground, showing that shielding and plugging are successful; lowering the continuous oil pipe for multi-cluster perforation and main fracturing of the next section until fracturing of all sections is completed. Multi-cluster sand blasting perforation of the continuous oil pipe is combined with in-crack sand filling temporary plugging staged fracturing, so that the complex problems that a mechanical bridge plug and a perforation tool cannot be lowered due to casing deformation and hole shrinkage and the like can be solved effectively.

Description

technical field [0001] The invention relates to a staged fracturing process for shielding temporary plugging in a proppant fracture in a shale gas horizontal well, which is used for staged fracturing reformation of shale gas wells. Background technique [0002] At present, shale gas horizontal well reservoir fracturing in the Sichuan Basin generally uses bridge plug segmentation technology, and the injection method is bare casing fracturing. Under the influence of various factors such as formation dislocation, inter-well interference and casing quality caused by neotectonic movement, complex downhole situations such as casing deformation may occur, which brings huge risks and challenges to reservoir stimulation. In the actual construction, due to the deformation of the casing in the wellbore, the diameter of the wellbore becomes smaller, and the use of mechanical isolation cannot carry out operations such as cable transmission cluster perforation and bridge plug running, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/114
CPCE21B43/114E21B43/267
Inventor 朱炬辉石孝志张俊成钱斌李军龙尹丛彬何封刘恒宋丹
Owner BC P INC CHINA NAT PETROLEUM CORP
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