Process for improving bearing capacity of formation

A technology of pressure bearing capacity and formation, applied in wellbore/well components, sealing/isolation, earth-moving drilling, etc., can solve the problem that the inert loss-stopping agent cannot be well cemented, the opening of formation cracks is very different, and the leakage The problem of low success rate, etc., can achieve the effect of accurate fracture opening, long plugging well section, and improving the success rate of lost circulation.

Active Publication Date: 2013-04-03
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, "Drilling Fluids and Completion Fluids" published "Technology for Improving Formation Pressure-bearing Capability" in Issue 02, 2009, and "Research on Improving Formation Pressure-bearing Capability" was published in "Drilling and Completion Fluids" Issue 05, 2011. Although these technologies improve the pressure bearing capacity of the formation before lost circulation occurs, there are still the following shortcomings: 1. The opening of formation f

Method used

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  • Process for improving bearing capacity of formation

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Example Embodiment

[0027] Example 1

[0028] A process for improving the pressure-bearing capacity of a formation is characterized in that it comprises the following steps:

[0029] a. According to the data of the pore size of the formation obtained from the core of the exploration well in the block, the data of the pore 2 size of this well is obtained, and the plugging slurry is prepared according to the size of the pore 2 of the formation using gel and plugging particles of the corresponding size;

[0030] b. Pump the prepared plugging slurry into the wellbore 1, and close the plugging device 6 after the wellbore 1 is filled;

[0031] c. Continue to pump the plugging slurry into the wellbore 1, so that the plugging slurry in the wellbore 1 squeezes into the formation;

[0032] d. Rigid plugging particles 3 bridge the formation pores 2 to build a skeleton, and flexible plugging particles 4 fill and block the rigid plugging particles 3, and try to fill the pores 2 near the wellbore 1 to make the plugging ...

Example Embodiment

[0040] Example 2

[0041] This embodiment is basically the same as the above embodiment, the main difference is:

[0042] In the step a, the plugging slurry is prepared according to the relationship of 2.5 times the volume of the wellbore, and the plugging slurry is prepared according to the following mass percentage examples: 1% gel, 3% polyacrylamide, 5% rigid plugging particles, 20% flexible plugging Leaking particles, the balance is water.

[0043] In the present invention, the rigid plugging particles refer to sand-gravel materials with a size of 0.5 cm, and the flexible plugging particles refer to mica materials with a size of 0.1 cm.

[0044] In the step c, Shanfan pumps the plugging slurry into the wellbore with a displacement of 8L / S.

Example Embodiment

[0045] Example 3

[0046] This embodiment is basically the same as the above embodiment, the main difference is:

[0047] In step a, the plugging slurry is prepared according to the relationship of 1 times the volume of the wellbore, and the plugging slurry is prepared according to the following mass percentage examples: 3% gel, 10% rigid plugging particles, 25% flexible plugging particles, and the balance is water.

[0048] The rigid plugging particles refer to nut shells with a size of 2 cm, and the flexible plugging particles refer to mica-based materials with a size of 1 cm.

[0049] In the step c, Shanfan pumps the plugging slurry into the wellbore with a displacement of 10L / S.

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Abstract

The invention discloses a process for improving bearing capacity of a formation. The process for improving the bearing capacity of the formation comprises the following steps of: a, working out respective sizes of formation pores according to formation fracture data obtained by block coring, and preparing different sealing slurry by using gel and sealing particles of corresponding dimensions according to the respective sizes of the formation pores; b, pumping the prepared sealing slurry into a shaft, and closing a blowout preventer after the sealing slurry is full of the shaft; c, continuously pumping the sealing slurry into the shaft to enable the sealing slurry in the shaft to be extruded into the formation; and d, respectively building frameworks at the formation pores by rigid sealing particles in the manner of bridging, filling and compacting flexible sealing particles among the rigid sealing particles to fill pores near the formation of the shaft to the greatest extent so as to enable the casing pressure value of the blowout preventer to be increased continuously, therefore improving the bearing capacity of the formation. According to the process for improving the bearing capacity of the formation, bearing sealing is performed on the formation in advance, through the formation fracture data obtained by the block coring, the sealing is performed on the formation by using the chemical gel which is equivalent to formation porosity and the rigid and flexible sealing particles when drilling is performed, and therefore, the bearing capacity of the formation is artificially improved, the phenomenon that drilling fluid leaks from the formation due to the fact that drilling fluid density rises at the later stage of construction is prevented, and drilling construction can be smoothly performed.

Description

technical field [0001] The invention relates to a technique for improving the pressure-bearing capacity of formations, which belongs to the technical field of drilling construction and can be used for drilling construction in weak pressure-bearing blocks of oil fields. Background technique [0002] In the existing technology, the pressure bearing capacity of the formation in some blocks of the oilfield is weak, and the drilling fluid density exceeds 1.05g / cm 3 Leakage is prone to occur, and the original technology is usually to stop the lost circulation after the occurrence of lost circulation. For example, Chinese Patent No. "201010502689.X" discloses a method of sequential compound method for plugging in well drilling. The publication date is May 02, 2012 The method described is to send two or more kinds of plugging fluids with different components and different properties into the downhole leakage layer in proportion and successively for plugging, including the following ...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/12
Inventor 李德波张红新胡祖彪王清臣陈廷廷
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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