Controlled multi-fracture fracturing method in medium-deep coal seam
A technology with multiple fractures and coal seams, which is applied in the direction of earthwork drilling, wellbore/well components, and production fluids, etc. It can solve problems such as excessive filtration of fracturing fluid, failure to achieve production stimulation effects, and small scale of sand addition, etc., to achieve reduction Increase the construction pressure, improve the success rate of fracturing construction, and ensure the effect of smooth joining
Active Publication Date: 2016-04-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0002] Medium-deep coal seams are usually fractured with conventional active water and sand. The scale of sand addition is small and the sand ratio is low. Due to the large amount of active water filtration and poor sand-carrying capacity, natural fractures have excessive filtration of fracturing fluid and construction pressure. Difficulties such as high height and difficulty in adding sand
The success rate of construction with active water is low, and the expected production increase effect cannot be achieved
Method used
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[0026] Such as figure 1 As shown, the medium-deep coal seam controlled multi-fracture fracturing method at least includes:
[0027] 1) Prepare fluid loss fracturing fluid;
[0028] 2) Use a high-pressure pump set to inject the viscous fluid loss fracturing fluid into the formation at high speed, and create fractures in the middle-deep coal seam; use a high-pressure pump set to inject the viscous fluid loss fracturing fluid into the formation at high speed, In the middle-deep coal seam setting seam fracture, the pressure of the high-pressure pump set is stepped up.
[0029] 3) Use a high-pressure pump set to inject viscous fluid loss fracturing fluid into the fractures at high speed, and extend the formed fractures inward. Add proppant to the injected fluid loss fracturing fluid, so that the proppant is filled in the fractures opened to support the fracture surface;
[0030] 4) Use a high-pressure pump set to inject viscous fluid loss fracturing fluid into the extended fract...
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The invention relates to an oil extraction process for oil fields, in particular to a multi-crack fracturing control method for medium-depth coal beds. The method comprises six steps of 1) preparation of a filtrate reduction fracturing fluid; 2) utilization of a high-pressure pump set; 3) utilization of a high-pressure pump set; 4) utilization of a high-pressure pump set; 5) phased utilization of a prepad liquid; and 6) ending of work. According to the multi-crack fracturing control method, prior conventional active-water sand fracturing method is changed through theoretical analysis and on-site verification, and the filtrate reduction fracturing fluid, the prepad liquid variable displacement technology, a multi-stage particle size slug technology, a reasonable mortar-sand ratio raising technology and the like are used, accordingly, difficulties such as large filter losses, poor sand carrying capabilities and excess leak-off of the fracturing liquid and high construction pressure during opening of natural cracks are overcome. Multi-crack is effectively prevented and treated through the means of the filtrate reduction fracturing fluid, and the prepad liquid variable displacement technology and the multi-stage particle size slug technology, so that the construction pressure is reduced, smooth adding of a propping agent is guaranteed, and the fracturing construction success rate is improved.
Description
technical field [0001] The invention relates to a process method for oil recovery in an oil field, in particular to a controlled multi-fracture fracturing method for medium-deep coal seams used in underground coal seam operations. Background technique [0002] Medium-deep coal seams are usually fractured with conventional active water and sand. The scale of sand addition is small and the sand ratio is low. Due to the large amount of active water filtration and poor sand-carrying capacity, natural fractures have excessive filtration of fracturing fluid and construction pressure. Difficulties such as high height and difficulty in adding sand. The success rate of construction using active water is low, and the expected production increase effect cannot be achieved. Contents of the invention [0003] The object of the present invention is to provide a method for controlling multiple fractures in medium-deep coal seams that can effectively prevent and control multiple fracture...
Claims
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IPC IPC(8): E21B43/267
Inventor 孙虎陈平刘国良杨燕池晓明陶长州袁冬蕊宋孝丹王新蒲尹俊禄
Owner BC P INC CHINA NAT PETROLEUM CORP