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A kind of plugging agent for drilling fluid and preparation method thereof

A technology for plugging agent and drilling fluid, applied in the field of plugging agent for drilling fluid and its preparation, can solve problems such as product failure, influence of drilling fluid rheology, etc., and achieve the effects of poor water solubility, avoiding aging failure and small particle size

Active Publication Date: 2017-07-11
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

Although inert inorganic materials are not sensitive to temperature and salt, their molecular structure is relatively rigid. When plugging, the particle size must match the size of formation fractures to be effective. In addition, the dosage of such plugging agents is too large It will affect the rheology of drilling fluid
Asphalt-based plugging agents can effectively fill formation fractures, but the product will fail when the bottom hole temperature is higher than its softening point

Method used

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  • A kind of plugging agent for drilling fluid and preparation method thereof
  • A kind of plugging agent for drilling fluid and preparation method thereof
  • A kind of plugging agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Dissolve 15g of sodium humate in 90mL of water, adjust the pH to 8 with 3g of calcium oxide, and prepare a mixed solution of A;

[0021] 2) Add 15 g of calcium lignosulfonate and 2.5 g of 20% formaldehyde solution to the A mixed solution prepared in step 1, and react for 5 hours at 80° C. to prepare the B mixed solution;

[0022] 3) Add 10g of 2-methyl-2-acrylamidopropanesulfonic acid to the mixed solution of B obtained in step 2, adjust the pH value to 9 with caustic soda, add 0.2g of azobisisobutyronitrile, at 50°C , reacted for 5h to prepare a mixed solution of C;

[0023] 4) Dry the mixed solution C obtained in step 3 in an oven at a temperature of 90°C for 12 hours, pulverize it with a pulverizer after drying, and pass it through a 500-mesh sieve to obtain the plugging agent for drilling fluid.

Embodiment 2

[0025] 1) Dissolve 25g of sodium humate in 80mL of water, adjust the pH value to 11 with 4.5g of calcium oxide, and prepare a mixed solution of A;

[0026] 2) Add 25 g of calcium lignosulfonate and 5 g of 20% formaldehyde solution to the A mixed solution prepared in step 1, and react for 3 hours at 90° C. to prepare the B mixed solution;

[0027] 3) Add 15g of 2-methyl-2-acrylamidopropanesulfonic acid to the mixed solution of B obtained in step 2, adjust the pH value to 13 with caustic soda, add 0.3g of azobisisobutyronitrile, at 60°C , and reacted for 3h to prepare a mixed solution of C;

[0028] 4) Dry the mixed solution C obtained in step 3 in an oven at a temperature of 90°C for 12 hours, pulverize it with a pulverizer after drying, and pass it through a 500-mesh sieve to obtain the plugging agent for drilling fluid.

Embodiment 3

[0030] 1) Dissolve 20g of sodium humate in 60mL of water, adjust the pH value to 10 with 4g of calcium oxide, and prepare a mixed solution of A;

[0031] 2) Add 15 g of calcium lignosulfonate and 8 g of 20% formaldehyde solution to the aqueous solution prepared in step 1, and react for 5 hours at 90° C. to obtain a mixed solution of B;

[0032] 3) Add 12g of 2-methyl-2-acrylamidopropanesulfonic acid to the mixed solution of B obtained in step 2, adjust the pH value to 12 with caustic soda, add 0.3g of azobisisobutyronitrile, at 70°C , reacted for 5h to prepare a mixed solution of C;

[0033] 4) Dry the mixed solution C obtained in step 3 in an oven at a temperature of 90°C for 12 hours, pulverize it with a pulverizer after drying, and pass it through a 500-mesh sieve to obtain the plugging agent for drilling fluid.

[0034] Effect Evaluation of Plugging Agent Used in Drilling Fluid

[0035] 1. Plugging agent plugging test

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Abstract

The invention discloses a blocking agent for a drilling liquid. The blocking agent is prepared by reaction of four raw materials: calcium lignosulphonate, sodium humate, a 20% formaldehyde solution and 2-methyl-2-acrylamido propanesulfonic acid and an initiator, wherein the mass ratio of calcium lignosulphonate to sodium humate to 20% formaldehyde solution to 2-methyl-2-acrylamido propanesulfonic acid is (30-50): (30-50): (5-15): (20-30). The blocking agent disclosed by the invention is small in particle diameter and poor in water solubility, can be effectively filled in a formation fracture to play a blocking role, and is long in molecular chain. The structure has certain elasticity and is easily filled in the formation fracture compared with the blocking agent of a rigid structure.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] Plugging agent is a kind of treatment agent used in a large amount in drilling fluid. In addition to the plugging effect, it can also adjust the dynamic shear force, static shear force, filter loss and improve the quality of mud cake. It has an important influence on wall stability and reservoir protection. [0003] With the development of oil exploration and development towards deep formations and complex formations (low pressure and easy leakage, salt gypsum formation, high temperature and high pressure formation), the number of deep wells and ultra-deep wells in Dagang, East Hebei and Xinjiang has been increasing, and the drilling fluid technology under complex geological conditions has been improved. It has become a bottleneck problem restricting exploration and development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/42C08F289/00C08F220/58C08H7/00
CPCC08F220/58C08F220/585C08F289/00C09K8/035C09K8/42C09K8/426
Inventor 张坤王伟忠李广环王磊磊郭剑梅张向明孙双
Owner BC P INC CHINA NAT PETROLEUM CORP
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