Staged fracturing technology of proppant shielding and temporary plugging in shale gas horizontal wells

A technology for staged fracturing and horizontal wells, which is applied in wellbore/well components, production fluids, and earthwork drilling, etc. It can solve problems such as the inability of perforating tools to run in, reduce subsequent construction risks, save construction time, The effect of reducing the risk of construction work

Active Publication Date: 2020-06-26
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 shale gas horizontal well proppant fracture shielding temporary plugging staged fracturing process, comprising the following steps:

[0028] (1) Run the coiled tubing and sandblasting perforating tools into the interval that needs fracturing, and after performing multi-cluster perforation, pull out the coiled tubing and perforating tools;

[0029] (2) The highest safe pump pressure is set on the ground, and main fracturing is carried out to promote volumetric fractures in the reservoir;

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

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

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

Embodiment 2

[0040] Adopt the present invention, at first carry out ground preparation work according to construction requirement;

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

[0042] Through the casing injection method, the main fracturing construction is carried out by applying the large displacement, large liquid volume, and slick water sand-carrying fracturing technology. At the end of the main fracturing construction, temporary plugging of proppant in artificial fractures is carried out to increase the concentration of trailing proppant , after the high-concentration proppant enters the pores of the reservoir, reduce the construction displacement until the plugging is suc...

Embodiment 3

[0045] Well YS-1 was drilled in the Silurian Longmaxi Formation, and was completed with 139.7mm reservoir casing. The well was completed with a drilling depth of 4517m, a maximum inclination of 93.02°, a vertical depth of 2561.68m, a target entry point of 3017m, a target exit point of 4517m, and a horizontal section length of 1500m. Well YS-1 encountered reservoirs with 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 stress is large (greater than 15 MPa), and the distribution of natural fractures is complex.

[0046] This well design applies fracturing construction 14 sections of the present invention, and concrete technology is as follows:

[0047] (1) Perform the first cl...

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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 shale gas horizontal well proppant fracture inner shield temporary plugging staged fracturing process, which is used for staged fracturing reconstruction of shale gas wells. Background technique [0002] At present, bridge plug segmentation technology is generally used in the fracturing stimulation of shale gas horizontal well reservoirs in the Sichuan Basin, and the injection method is bare casing fracturing. Under the influence of various factors such as formation dislocation caused by neotectonic movement, interwell interference, casing quality, etc., downhole complex situations such as casing deformation may occur, which brings huge risks and challenges to reservoir stimulation. In actual construction, due to the deformation of the inner casing in the wellbore, the diameter of the wellbore becomes smaller, and mechanical isolation cannot be used for cable transmission, clustered perforation and bridge plugging, which grea...

Claims

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Application Information

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Patent Type & Authority Patents(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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