Method for improving multi-cluster crack initiation effectiveness by blocking seams through multi-scale soluble balls
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A multi-scale and effective technology, applied in the direction of mining fluid, earthwork drilling, sealing/isolation, etc., can solve the problem of low opening probability
Inactive Publication Date: 2016-04-13
PETROCHINA CO LTD
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[0005] The purpose of the present invention is to provide a method of using multi-scale soluble balls to seal the cracks and improve the effectiveness of multi-cluster cracking, so as to solve the problem that the opening probability of each cluster in each section of the existing horizontal well is too low
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Embodiment 1
[0025] This embodiment provides a method for improving the effectiveness of multi-cluster crack initiation by using multi-scale soluble balls to seal cracks, including the following steps:
[0026] Step 1) Drain the well using the drilling gauge: Drill the well to the artificial well bottom of the operating well to ensure that the wellbore is clean, check whether the inner diameter of the operating well is deformed or blocked, and if the operating well is deformed or blocked, repair the well;
[0027] Step 2) Perform multi-cluster perforation on the first section of the horizontal well;
[0028] Step 3) Fracturing construction using multi-cluster fracturing technology;
[0029] Step 4) Pumping pre-fluid and sand-carrying fluid;
[0030] Step 5) Pump soluble balls 1 with particle sizes of 0.1mm, 1mm, 3mm, and 5mm through the fracturing fluid, the ratio is 2:1.8:3:0.8, and the volume fraction of soluble balls 1 in the fracturing fluid is 0.17;
[0031] Step 6) Soluble ball 1 ...
Embodiment 2
[0037] On the basis of Example 1, fire multi-cluster or hydraulic sandblasting multi-cluster perforation is used for horizontal wells; hydraulic bridge plug staged multi-cluster fracturing process or hydraulic sandblasting staged multi-cluster fracturing process is used for fracturing construction.
[0038] figure 1 Schematic diagram of partial perforation cluster opening for conventional horizontal wells; figure 2 It is a schematic diagram of multi-cluster opening of horizontal wells using multi-scale soluble balls 1 in the present invention; during fracturing construction, see proppant concentration, surface pressure and sand-carrying fluid discharge image 3 as shown, Figure 4 It is a schematic diagram of multi-clusters in horizontal wells after the self-dissolution of multi-scale soluble spheres 1.
[0039] The method provided by the present invention solves the problem that the opening rate of each cluster in each section of the existing horizontal well is relatively...
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Abstract
The invention provides a method for improving multi-cluster crack initiation effectiveness by blocking seams through multi-scale soluble balls. The method includes the following steps of firstly, conducting the drafting process through a drift size gauge tool; secondly, conducting multi-cluster perforation on the first section of a horizontal well; thirdly, conducting fracture construction; fourthly, pumping prepad fluid and sand-carrying fluid; fifthly, pumping the multi-scale soluble balls through a fracturing fluid pump; sixthly, making the soluble balls dissolve themselves after fracture construction is completed; seventhly, repeatedly executing the second step to the sixth step, and fracturing all layer sections of the operating well; eighthly, conducting blowout, production and well completion. The method solves the problem that the opening rate of each cluster in each section of an existing horizontal well is low; multi-stage temporary blocking is conducted on cracked and extending crack seams through the multi-scale soluble balls, and therefore fluid can turn the direction between perforation clusters, perforation clusters which do not crack are forced to crack, new seams are manufactured, the aims of effectively cracking and extending all the perforation clusters can be achieved, and it can be avoided that holes are blocked and the oil well yield is influenced.
Description
technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a method for using multi-scale soluble balls to seal cracks and improve the effectiveness of multi-cluster crack initiation. Background technique [0002] In recent years, the method of "horizontal well + segmented multi-cluster volume fracturing" has become an effective means to develop unconventional oil and gas reservoirs. single-stage perforation and single-stage fracturing. [0003] At present, hydraulic bridge plug staged multi-cluster fracturing technology is mainly used in foreign countries, that is, through hydraulic pumping or coiled tubing, the quick-drilling bridge plug and perforating gun are used to lower the drilling tool to the predetermined position, and after the bridge plug is set and released, Separate from the perforating gun, lift the perforating gun to the perforation position, perform multi-cluster perforation according to t...
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