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Multistage sand jet perforation and fracture combined operation method adopting coiled tubing and bottom packer

A sandblasting perforating and tubing technology, which is applied in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of inability to open the oil layer in a targeted manner, the effect of stimulation is not obvious, and the parameters are optimized. To achieve the effect of easy workover operation, low friction and stable working performance

Inactive Publication Date: 2015-12-30
北京泰坦通源天然气资源技术有限公司 +1
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AI Technical Summary

Problems solved by technology

Using this fracturing method will lead to the following problems: (1) Targeted reservoirs cannot be decompressed; (2) Parameter optimization after fracturing treatment
Moreover, this conventional fracturing method is expensive and time-consuming, and the production stimulation effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Select the appropriate wellhead. Determine the wellhead pressure according to the designed maximum pump pressure; determine the inner diameter of the wellhead according to the production casing and water injection components.

[0028] The setting (laying) of pipelines, wherein specific pipelines include low-pressure fluid supply pipelines, high-pressure fluid power supply lines and return pipelines. The low-pressure fluid supply line is used to ensure that the fracturing fluid can be pressed into the coiled tubing and the casing annulus during the fracturing operation; the high-pressure fluid power line is used to pump the proppant into the coiled tubing at a low speed during the perforating operation The fracturing fluid is used to maintain the balance of the dynamic pressure of the wellbore and monitor the bottom hole pressure; the return line: includes two independent flowback line systems, one is used to meet the liquid flowing out of the coiled tubing, and the othe...

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Abstract

The invention relates to a multistage sand jet perforation and fracture combined operation method adopting coiled tubing and a bottom packer. The method comprises the following steps: 1, coiled tubing wellhead equipment is assembled; 2, a positioner, the packer and a sand jet perforator are connected with the tail end of the coiled tubing sequentially; 3, the coiled tubing is descended into a well; a to-be-fractured horizon is determined, the packer is set, and sealing is examined; 4, after the sealing is examined to be qualified, a pump is started to pump a perforation fluid into the coiled tubing, and the step 4 is executed again if a formation is not perforated until a casing is perforated; 6, the coiled tubing is lifted up and the packer is unset after annulus sand fracture construction, operation is performed from the step 3 when perforation and fracture of next horizon are required, otherwise, the coiled tubing is lifted to a wellhead, and the operation is ended. The method has the advantages of short operation period, flexible and careful stratification, reliable packing and clean shaft after construction and can realize multilayer test and production.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploitation, and in particular relates to a sandblasting perforator applied to multi-coal-measure formations and connected to a packer at the bottom of the pipe string for perforation, and pressure is suppressed in the casing annulus after perforation A method for performing combined fracturing. Background technique [0002] At present, in the technical field of oil and gas well perforation and completion, common perforation techniques include wireline perforation and tubing perforation. [0003] The principle of wireline conveying perforation is to use cables to transport the perforator and downhole positioning device downhole to align the perforator with the target layer through measurement and depth positioning, and detonate the perforator to shoot the perforating bullet through the casing, cement sheath and enter The formation has a certain depth, so as to form an effective communica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/114E21B43/267
Inventor 李启国
Owner 北京泰坦通源天然气资源技术有限公司
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